Mercurial > hg > nginx-site
annotate xml/en/docs/dev/development_guide.xml @ 2071:838c503fd2f7
Documented JSON object support for njs.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 14 Nov 2017 21:41:37 +0300 |
parents | a8d1a748324f |
children | 75882a2ca9dd |
rev | line source |
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1899 | 1 <?xml version="1.0"?> |
2 | |
3 <!-- | |
4 Copyright (C) Nginx, Inc. | |
5 --> | |
6 | |
7 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd"> | |
8 | |
9 <article name="Development guide" | |
10 link="/en/docs/dev/development_guide.html" | |
11 lang="en" | |
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12 rev="2"> |
1899 | 13 |
14 <section name="Introduction" id="introduction"> | |
15 | |
16 | |
17 <section name="Code layout" id="code_layout"> | |
18 | |
19 <list type="bullet"> | |
20 <listitem> | |
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21 <literal>auto</literal> — Build scripts |
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22 </listitem> |
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23 |
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24 <listitem> |
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25 <literal>src</literal> |
1899 | 26 |
27 <list type="bullet"> | |
28 | |
29 <listitem> | |
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30 <literal>core</literal> — Basic types and functions — string, array, log, |
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31 pool, etc. |
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32 </listitem> |
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33 |
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34 <listitem> |
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35 <literal>event</literal> — Event core |
1899 | 36 |
37 <list type="bullet"> | |
38 | |
39 <listitem> | |
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40 <literal>modules</literal> — Event notification modules: |
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41 <literal>epoll</literal>, <literal>kqueue</literal>, <literal>select</literal> |
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42 etc. |
1899 | 43 </listitem> |
44 | |
45 </list> | |
46 | |
47 </listitem> | |
48 | |
49 <listitem> | |
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50 <literal>http</literal> — Core HTTP module and common code |
1899 | 51 |
52 <list type="bullet"> | |
53 | |
54 <listitem> | |
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55 <literal>modules</literal> — Other HTTP modules |
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56 </listitem> |
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57 |
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58 <listitem> |
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59 <literal>v2</literal> — HTTP/2 |
1899 | 60 </listitem> |
61 | |
62 </list> | |
63 | |
64 </listitem> | |
65 | |
66 <listitem> | |
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67 <literal>mail</literal> — Mail modules |
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68 </listitem> |
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69 |
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70 <listitem> |
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71 <literal>os</literal> — Platform-specific code |
1899 | 72 |
73 <list type="bullet"> | |
74 | |
75 <listitem> | |
76 <literal>unix</literal> | |
77 </listitem> | |
78 | |
79 <listitem> | |
80 <literal>win32</literal> | |
81 </listitem> | |
82 | |
83 </list> | |
84 | |
85 </listitem> | |
86 | |
87 <listitem> | |
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88 <literal>stream</literal> — Stream modules |
1899 | 89 </listitem> |
90 | |
91 </list> | |
92 | |
93 </listitem> | |
94 | |
95 </list> | |
96 | |
97 </section> | |
98 | |
99 | |
100 <section name="Include files" id="include_files"> | |
101 | |
102 <para> | |
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103 The following two <literal>#include</literal> statements must appear at the |
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104 beginning of every nginx file: |
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105 </para> |
1899 | 106 |
107 <programlisting> | |
108 #include <ngx_config.h> | |
109 #include <ngx_core.h> | |
110 </programlisting> | |
111 | |
112 <para> | |
113 In addition to that, HTTP code should include | |
114 </para> | |
115 | |
116 | |
117 <programlisting> | |
118 #include <ngx_http.h> | |
119 </programlisting> | |
120 | |
121 <para> | |
122 Mail code should include | |
123 </para> | |
124 | |
125 | |
126 <programlisting> | |
127 #include <ngx_mail.h> | |
128 </programlisting> | |
129 | |
130 <para> | |
131 Stream code should include | |
132 </para> | |
133 | |
134 | |
135 <programlisting> | |
136 #include <ngx_stream.h> | |
137 </programlisting> | |
138 | |
139 </section> | |
140 | |
141 | |
142 <section name="Integers" id="integers"> | |
143 | |
144 <para> | |
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145 For general purposes, nginx code uses two integer types, |
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146 <literal>ngx_int_t</literal> and <literal>ngx_uint_t</literal>, which are |
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147 typedefs for <literal>intptr_t</literal> and <literal>uintptr_t</literal> |
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148 respectively. |
1899 | 149 </para> |
150 | |
151 </section> | |
152 | |
153 | |
154 <section name="Common return codes" id="common_return_codes"> | |
155 | |
156 <para> | |
157 Most functions in nginx return the following codes: | |
158 </para> | |
159 | |
160 <list type="bullet"> | |
161 | |
162 <listitem> | |
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163 <literal>NGX_OK</literal> — Operation succeeded. |
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164 </listitem> |
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165 |
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166 <listitem> |
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167 <literal>NGX_ERROR</literal> — Operation failed. |
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168 </listitem> |
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169 |
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170 <listitem> |
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171 <literal>NGX_AGAIN</literal> — Operation incomplete; call the function again. |
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172 </listitem> |
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173 |
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174 <listitem> |
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175 <literal>NGX_DECLINED</literal> — Operation rejected, for example, because it is |
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176 disabled in the configuration. This is never an error. |
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177 </listitem> |
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178 |
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179 <listitem> |
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180 <literal>NGX_BUSY</literal> — Resource is not available. |
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181 </listitem> |
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182 |
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183 <listitem> |
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184 <literal>NGX_DONE</literal> — Operation complete or continued elsewhere. |
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185 Also used as an alternative success code. |
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186 </listitem> |
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187 |
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188 <listitem> |
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189 <literal>NGX_ABORT</literal> — Function was aborted. |
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190 Also used as an alternative error code. |
1899 | 191 </listitem> |
192 | |
193 </list> | |
194 | |
195 </section> | |
196 | |
197 | |
198 <section name="Error handling" id="error_handling"> | |
199 | |
200 <para> | |
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201 The <literal>ngx_errno</literal> macro returns the last system error code. |
1899 | 202 It's mapped to <literal>errno</literal> on POSIX platforms and to |
203 <literal>GetLastError()</literal> call in Windows. | |
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204 The <literal>ngx_socket_errno</literal> macro returns the last socket error |
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205 number. |
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206 Like the <literal>ngx_errno</literal> macro, it's mapped to |
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207 <literal>errno</literal> on POSIX platforms. |
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208 It's mapped to the <literal>WSAGetLastError()</literal> call on Windows. |
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209 Accessing the values of <literal>ngx_errno</literal> or |
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210 <literal>ngx_socket_errno</literal> more than once in a row can cause |
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211 performance issues. |
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212 If the error value might be used multiple times, store it in a local variable |
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213 of type <literal>ngx_err_t</literal>. |
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214 To set errors, use the <literal>ngx_set_errno(errno)</literal> and |
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215 <literal>ngx_set_socket_errno(errno)</literal> macros. |
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216 </para> |
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217 |
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218 <para> |
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219 The values of <literal>ngx_errno</literal> and |
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220 <literal>ngx_socket_errno</literal> can be passed to the logging functions |
1899 | 221 <literal>ngx_log_error()</literal> and <literal>ngx_log_debugX()</literal>, in |
222 which case system error text is added to the log message. | |
223 </para> | |
224 | |
225 <para> | |
226 Example using <literal>ngx_errno</literal>: | |
227 </para> | |
228 | |
229 | |
230 <programlisting> | |
231 void | |
232 ngx_my_kill(ngx_pid_t pid, ngx_log_t *log, int signo) | |
233 { | |
234 ngx_err_t err; | |
235 | |
236 if (kill(pid, signo) == -1) { | |
237 err = ngx_errno; | |
238 | |
239 ngx_log_error(NGX_LOG_ALERT, log, err, "kill(%P, %d) failed", pid, signo); | |
240 | |
241 if (err == NGX_ESRCH) { | |
242 return 2; | |
243 } | |
244 | |
245 return 1; | |
246 } | |
247 | |
248 return 0; | |
249 } | |
250 </programlisting> | |
251 | |
252 </section> | |
253 | |
254 | |
255 </section> | |
256 | |
257 | |
258 <section name="Strings" id="strings"> | |
259 | |
260 | |
261 <section name="Overview" id="overview"> | |
262 | |
263 <para> | |
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264 For C strings, nginx uses the unsigned character type pointer |
1899 | 265 <literal>u_char *</literal>. |
266 </para> | |
267 | |
268 <para> | |
269 The nginx string type <literal>ngx_str_t</literal> is defined as follows: | |
270 </para> | |
271 | |
272 | |
273 <programlisting> | |
274 typedef struct { | |
275 size_t len; | |
276 u_char *data; | |
277 } ngx_str_t; | |
278 </programlisting> | |
279 | |
280 <para> | |
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281 The <literal>len</literal> field holds the string length and |
1899 | 282 <literal>data</literal> holds the string data. |
283 The string, held in <literal>ngx_str_t</literal>, may or may not be | |
284 null-terminated after the <literal>len</literal> bytes. | |
285 In most cases it’s not. | |
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286 However, in certain parts of the code (for example, when parsing configuration), |
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287 <literal>ngx_str_t</literal> objects are known to be null-terminated, which |
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288 simplifies string comparison and makes it easier to pass the strings to |
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289 syscalls. |
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290 </para> |
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291 |
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292 <para> |
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293 The string operations in nginx are declared in |
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294 <path>src/core/ngx_string.h</path> |
1899 | 295 Some of them are wrappers around standard C functions: |
296 </para> | |
297 | |
298 <para> | |
299 <list type="bullet"> | |
300 | |
301 <listitem> | |
302 <literal>ngx_strcmp()</literal> | |
303 </listitem> | |
304 | |
305 <listitem> | |
306 <literal>ngx_strncmp()</literal> | |
307 </listitem> | |
308 | |
309 <listitem> | |
310 <literal>ngx_strstr()</literal> | |
311 </listitem> | |
312 | |
313 <listitem> | |
314 <literal>ngx_strlen()</literal> | |
315 </listitem> | |
316 | |
317 <listitem> | |
318 <literal>ngx_strchr()</literal> | |
319 </listitem> | |
320 | |
321 <listitem> | |
322 <literal>ngx_memcmp()</literal> | |
323 </listitem> | |
324 | |
325 <listitem> | |
326 <literal>ngx_memset()</literal> | |
327 </listitem> | |
328 | |
329 <listitem> | |
330 <literal>ngx_memcpy()</literal> | |
331 </listitem> | |
332 | |
333 <listitem> | |
334 <literal>ngx_memmove()</literal> | |
335 </listitem> | |
336 | |
337 </list> | |
338 | |
339 </para> | |
340 | |
341 <para> | |
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342 Other string functions are nginx-specific |
1899 | 343 </para> |
344 | |
345 <para> | |
346 <list type="bullet"> | |
347 | |
348 <listitem> | |
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349 <literal>ngx_memzero()</literal> — Fills memory with zeroes. |
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350 </listitem> |
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351 |
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352 <listitem> |
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353 <literal>ngx_cpymem()</literal> — Does the same as |
1899 | 354 <literal>ngx_memcpy()</literal>, but returns the final destination address |
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355 This one is handy for appending multiple strings in a row. |
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356 </listitem> |
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357 |
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358 <listitem> |
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359 <literal>ngx_movemem()</literal> — Does the same as |
1899 | 360 <literal>ngx_memmove()</literal>, but returns the final destination address. |
361 </listitem> | |
362 | |
363 <listitem> | |
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364 <literal>ngx_strlchr()</literal> — Searches for a character in a string, |
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365 delimited by two pointers. |
1899 | 366 </listitem> |
367 </list> | |
368 </para> | |
369 | |
370 <para> | |
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371 The following functions perform case conversion and comparison: |
1899 | 372 </para> |
373 | |
374 <para> | |
375 <list type="bullet"> | |
376 | |
377 <listitem> | |
1999 | 378 <literal>ngx_tolower()</literal> |
379 </listitem> | |
380 | |
381 <listitem> | |
382 <literal>ngx_toupper()</literal> | |
383 </listitem> | |
384 | |
385 <listitem> | |
386 <literal>ngx_strlow()</literal> | |
387 </listitem> | |
388 | |
389 <listitem> | |
390 <literal>ngx_strcasecmp()</literal> | |
391 </listitem> | |
392 | |
393 <listitem> | |
394 <literal>ngx_strncasecmp()</literal> | |
1899 | 395 </listitem> |
396 | |
397 </list> | |
398 </para> | |
399 | |
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400 <para> |
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401 The following macros simplify string initialization: |
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402 </para> |
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403 |
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404 <list type="bullet"> |
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405 |
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406 <listitem> |
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407 <literal>ngx_string(text)</literal> — static initializer for the |
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408 <literal>ngx_str_t</literal> type from the C string literal |
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409 <literal>text</literal> |
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410 </listitem> |
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411 |
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412 <listitem> |
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413 <literal>ngx_null_string</literal> — static empty string initializer for the |
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414 <literal>ngx_str_t</literal> type |
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415 </listitem> |
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416 |
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417 <listitem> |
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418 <literal>ngx_str_set(str, text)</literal> — initializes string |
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419 <literal>str</literal> of <literal>ngx_str_t *</literal> type with the C string |
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420 literal <literal>text</literal> |
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421 </listitem> |
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422 |
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423 <listitem> |
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424 <literal>ngx_str_null(str)</literal> — initializes string <literal>str</literal> |
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425 of <literal>ngx_str_t *</literal> type with the empty string |
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426 </listitem> |
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427 |
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428 </list> |
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429 |
1899 | 430 </section> |
431 | |
432 | |
433 <section name="Formatting" id="formatting"> | |
434 | |
435 <para> | |
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436 The following formatting functions support nginx-specific types: |
1899 | 437 </para> |
438 | |
439 | |
440 <para> | |
441 <list type="bullet"> | |
442 | |
443 <listitem> | |
444 <literal>ngx_sprintf(buf, fmt, ...)</literal> | |
445 </listitem> | |
446 | |
447 <listitem> | |
448 <literal>ngx_snprintf(buf, max, fmt, ...)</literal> | |
449 </listitem> | |
450 | |
451 <listitem> | |
1975 | 452 <literal>ngx_slprintf(buf, last, fmt, ...)</literal> |
1899 | 453 </listitem> |
454 | |
455 <listitem> | |
456 <literal>ngx_vslprint(buf, last, fmt, args)</literal> | |
457 </listitem> | |
458 | |
459 <listitem> | |
460 <literal>ngx_vsnprint(buf, max, fmt, args)</literal> | |
461 </listitem> | |
462 | |
463 </list> | |
464 </para> | |
465 | |
466 <para> | |
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467 The full list of formatting options, supported by these functions is |
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468 in <path>src/core/ngx_string.c</path>. Some of them are: |
1899 | 469 </para> |
470 | |
471 | |
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472 <list type="bullet"> |
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473 |
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474 <listitem> |
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475 <literal>%O</literal> — <literal>off_t</literal> |
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476 </listitem> |
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477 |
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478 <listitem> |
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479 <literal>%T</literal> — <literal>time_t</literal> |
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480 </listitem> |
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481 |
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482 <listitem> |
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483 <literal>%z</literal> — <literal>ssize_t</literal> |
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484 </listitem> |
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485 |
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486 <listitem> |
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487 <literal>%i</literal> — <literal>ngx_int_t</literal> |
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488 </listitem> |
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489 |
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490 <listitem> |
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491 <literal>%p</literal> — <literal>void *</literal> |
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492 </listitem> |
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493 |
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494 <listitem> |
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495 <literal>%V</literal> — <literal>ngx_str_t *</literal> |
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496 </listitem> |
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497 |
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498 <listitem> |
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499 <literal>%s</literal> — <literal>u_char *</literal> (null-terminated) |
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500 </listitem> |
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501 |
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502 <listitem> |
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503 <literal>%*s</literal> — <literal>size_t + u_char *</literal> |
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504 </listitem> |
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505 |
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506 </list> |
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507 |
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508 |
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509 <para> |
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510 You can prepend <literal>u</literal> on most types to make them unsigned. |
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511 To convert output to hex, use <literal>X</literal> or <literal>x</literal>. |
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512 </para> |
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513 |
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514 <para> |
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515 For example: |
1899 | 516 |
517 <programlisting> | |
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518 u_char buf[NGX_INT_T_LEN]; |
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519 size_t len; |
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520 ngx_uint_t n; |
1899 | 521 |
522 /* set n here */ | |
523 | |
1935
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524 len = ngx_sprintf(buf, "%ui", n) — buf; |
1899 | 525 </programlisting> |
526 | |
527 </para> | |
528 | |
529 </section> | |
530 | |
531 | |
532 <section name="Numeric conversion" id="numeric_conversion"> | |
533 | |
534 <para> | |
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535 Several functions for numeric conversion are implemented in nginx. |
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536 The first four each convert a string of given length to a positive integer of |
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537 the indicated type. |
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538 They return <literal>NGX_ERROR</literal> on error. |
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539 |
1899 | 540 <list type="bullet"> |
541 | |
542 <listitem> | |
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543 <literal>ngx_atoi(line, n)</literal> — <literal>ngx_int_t</literal> |
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544 </listitem> |
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545 |
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546 <listitem> |
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547 <literal>ngx_atosz(line, n)</literal> — <literal>ssize_t</literal> |
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548 </listitem> |
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549 |
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550 <listitem> |
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551 <literal>ngx_atoof(line, n)</literal> — <literal>off_t</literal> |
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552 </listitem> |
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553 |
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554 <listitem> |
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555 <literal>ngx_atotm(line, n)</literal> — <literal>time_t</literal> |
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556 </listitem> |
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557 |
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558 </list> |
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559 </para> |
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560 |
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561 <para> |
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562 There are two additional numeric conversion functions. |
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563 Like the first four, they return <literal>NGX_ERROR</literal> on error. |
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|
564 |
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565 <list type="bullet"> |
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566 |
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567 <listitem> |
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568 <literal>ngx_atofp(line, n, point)</literal> — Converts a fixed point floating |
1899 | 569 number of given length to a positive integer of type |
570 <literal>ngx_int_t</literal>. | |
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571 The result is shifted left by <literal>point</literal> decimal |
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572 positions. |
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573 The string representation of the number is expected to have no more |
1899 | 574 than <literal>points</literal> fractional digits. |
1993
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575 For example, <literal>ngx_atofp("10.5", 4, 2)</literal> returns |
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576 <literal>1050</literal>. |
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577 </listitem> |
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578 |
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579 <listitem> |
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580 <literal>ngx_hextoi(line, n)</literal> — Converts a hexadecimal representation |
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581 of a positive integer to <literal>ngx_int_t</literal>. |
1899 | 582 </listitem> |
583 | |
584 </list> | |
585 </para> | |
586 | |
587 </section> | |
588 | |
1919
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589 <section name="Regular expressions" id="regex"> |
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590 |
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591 <para> |
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592 The regular expressions interface in nginx is a wrapper around |
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593 the <link url="http://www.pcre.org">PCRE</link> |
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|
594 library. |
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595 The corresponding header file is <path>src/core/ngx_regex.h</path>. |
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596 </para> |
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597 |
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598 <para> |
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599 To use a regular expression for string matching, it first needs to be |
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600 compiled, which is usually done at the configuration phase. |
1919
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601 Note that since PCRE support is optional, all code using the interface must |
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602 be protected by the surrounding <literal>NGX_PCRE</literal> macro: |
1993
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603 |
1919
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604 <programlisting> |
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605 #if (NGX_PCRE) |
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606 ngx_regex_t *re; |
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607 ngx_regex_compile_t rc; |
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608 |
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609 u_char errstr[NGX_MAX_CONF_ERRSTR]; |
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610 |
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611 ngx_str_t value = ngx_string("message (\\d\\d\\d).*Codeword is '(?<cw>\\w+)'"); |
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612 |
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613 ngx_memzero(&rc, sizeof(ngx_regex_compile_t)); |
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614 |
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615 rc.pattern = value; |
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616 rc.pool = cf->pool; |
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617 rc.err.len = NGX_MAX_CONF_ERRSTR; |
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618 rc.err.data = errstr; |
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619 /* rc.options are passed as is to pcre_compile() */ |
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620 |
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621 if (ngx_regex_compile(&rc) != NGX_OK) { |
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622 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V", &rc.err); |
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623 return NGX_CONF_ERROR; |
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624 } |
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625 |
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626 re = rc.regex; |
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627 #endif |
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628 </programlisting> |
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629 After successful compilation, the <literal>captures</literal> and |
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630 <literal>named_captures</literal> fields in the |
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631 <literal>ngx_regex_compile_t</literal> structure contain the count of all |
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632 captures and named captures, respectively, found in the regular expression. |
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633 </para> |
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634 |
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635 <para> |
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|
636 The compiled regular expression can then be used for matching against strings: |
1919
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637 <programlisting> |
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638 ngx_int_t n; |
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639 int captures[(1 + rc.captures) * 3]; |
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|
640 |
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|
641 ngx_str_t input = ngx_string("This is message 123. Codeword is 'foobar'."); |
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|
642 |
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643 n = ngx_regex_exec(re, &input, captures, (1 + rc.captures) * 3); |
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644 if (n >= 0) { |
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|
645 /* string matches expression */ |
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646 |
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647 } else if (n == NGX_REGEX_NO_MATCHED) { |
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648 /* no match was found */ |
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649 |
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650 } else { |
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|
651 /* some error */ |
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652 ngx_log_error(NGX_LOG_ALERT, log, 0, ngx_regex_exec_n " failed: %i", n); |
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653 } |
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|
654 </programlisting> |
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|
655 The arguments to <literal>ngx_regex_exec()</literal> are the compiled regular |
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656 expression <literal>re</literal>, the string to match <literal>s</literal>, |
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657 an optional array of integers to hold any <literal>captures</literal> that are |
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658 found, and the array's <literal>size</literal>. |
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659 The size of the <literal>captures</literal> array must be a multiple of three, |
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|
660 as required by the |
1919
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661 <link url="http://www.pcre.org/original/doc/html/pcreapi.html">PCRE API</link>. |
1993
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662 In the example, the size is calculated from the total number of captures plus |
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|
663 <literal>1</literal>one for the matched string itself. |
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|
664 </para> |
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|
665 |
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|
666 <para> |
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|
667 If there are matches, captures can be accessed as follows: |
1919
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668 <programlisting> |
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|
669 u_char *p; |
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|
670 size_t size; |
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|
671 ngx_str_t name, value; |
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|
672 |
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diff
changeset
|
673 /* all captures */ |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
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diff
changeset
|
674 for (i = 0; i < n * 2; i += 2) { |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
675 value.data = input.data + captures[i]; |
1935
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1932
diff
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|
676 value.len = captures[i + 1] — captures[i]; |
1919
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Added the "Regular expressions" section to the development guide.
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parents:
1915
diff
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|
677 } |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
678 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
679 /* accessing named captures */ |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
680 |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
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diff
changeset
|
681 size = rc.name_size; |
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Added the "Regular expressions" section to the development guide.
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diff
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|
682 p = rc.names; |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
683 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
684 for (i = 0; i < rc.named_captures; i++, p += size) { |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
685 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
686 /* capture name */ |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
687 name.data = &p[2]; |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
688 name.len = ngx_strlen(name.data); |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
689 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
690 n = 2 * ((p[0] << 8) + p[1]); |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
691 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
692 /* captured value */ |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
693 value.data = &input.data[captures[n]]; |
1935
be7490a66d1b
Style: use long dash with non-breaking space where appropriate.
Vladimir Homutov <vl@nginx.com>
parents:
1932
diff
changeset
|
694 value.len = captures[n + 1] — captures[n]; |
1919
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
695 } |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
696 </programlisting> |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
697 </para> |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
698 |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
699 <para> |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
700 The <literal>ngx_regex_exec_array()</literal> function accepts the array of |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
701 <literal>ngx_regex_elt_t</literal> elements (which are just compiled regular |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
702 expressions with associated names), a string to match, and a log. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
703 The function applies expressions from the array to the string until |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
704 either a match is found or no more expressions are left. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
705 The return value is <literal>NGX_OK</literal> when there is a match and |
1919
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
706 <literal>NGX_DECLINED</literal> otherwise, or <literal>NGX_ERROR</literal> |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
707 in case of error. |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
708 </para> |
dcfb4f3ac8a7
Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
709 |
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Added the "Regular expressions" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1915
diff
changeset
|
710 </section> |
1899 | 711 |
712 </section> | |
713 | |
714 | |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
715 <section name="Time" id="time"> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
716 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
717 <para> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
718 The <literal>ngx_time_t</literal> structure represents time with three separate |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
719 types for seconds, milliseconds, and the GMT offset: |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
720 <programlisting> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
721 typedef struct { |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
722 time_t sec; |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
723 ngx_uint_t msec; |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
724 ngx_int_t gmtoff; |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
725 } ngx_time_t; |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
726 </programlisting> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
727 The <literal>ngx_tm_t</literal> structure is an alias for |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
728 <literal>struct tm</literal> on UNIX platforms and <literal>SYSTEMTIME</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
729 on Windows. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
730 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
731 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
732 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
733 To obtain the current time, it is usually sufficient to access one of the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
734 available global variables, representing the cached time value in the desired |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
735 format. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
736 For example, the <literal>ngx_current_msec</literal> variable holds the number |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
737 of milliseconds elapsed since Epoch and truncated to |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
738 <literal>ngx_msec_t</literal>. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
739 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
740 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
741 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
742 The available string representations are: |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
743 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
744 <list type="bullet"> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
745 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
746 <listitem> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
747 <literal>ngx_cached_err_log_time</literal> — Used in error log entries: |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
748 <literal>"1970/09/28 12:00:00"</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
749 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
750 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
751 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
752 <literal>ngx_cached_http_log_time</literal> — Used in HTTP access log entries: |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
753 <literal>"28/Sep/1970:12:00:00 +0600"</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
754 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
755 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
756 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
757 <literal>ngx_cached_syslog_time</literal> — Used in syslog entries: |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
758 <literal>"Sep 28 12:00:00"</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
759 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
760 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
761 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
762 <literal>ngx_cached_http_time</literal> — Used in HTTP headers: |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
763 <literal>"Mon, 28 Sep 1970 06:00:00 GMT"</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
764 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
765 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
766 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
767 <literal>ngx_cached_http_log_iso8601</literal> — The ISO 8601 |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
768 standard format: |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
769 <literal>"1970-09-28T12:00:00+06:00"</literal> |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
770 </listitem> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
771 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
772 </list> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
773 </para> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
774 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
775 <para> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
776 The <literal>ngx_time()</literal> and <literal>ngx_timeofday()</literal> macros |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
777 return the current time value in seconds and are the preferred way to access |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
778 the cached time value. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
779 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
780 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
781 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
782 To obtain the time explicitly, use <literal>ngx_gettimeofday()</literal>, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
783 which updates its argument (pointer to |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
784 <literal>struct timeval</literal>). |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
785 The time is always updated when nginx returns to the event loop from system |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
786 calls. |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
787 To update the time immediately, call <literal>ngx_time_update()</literal>, |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
788 or <literal>ngx_time_sigsafe_update()</literal> if updating the time in the |
1982
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
789 signal handler context. |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
790 </para> |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
791 |
28ee7ab54a90
Added the "Time" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1981
diff
changeset
|
792 <para> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
793 The following functions convert <literal>time_t</literal> into the indicated |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
794 broken-down time representation. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
795 The first function in each pair converts <literal>time_t</literal> to |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
796 <literal>ngx_tm_t</literal> and the second (with the <literal>_libc_</literal> |
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797 infix) to <literal>struct tm</literal>: |
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798 |
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799 <list type="bullet"> |
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800 |
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801 <listitem> |
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802 <literal>ngx_gmtime(), ngx_libc_gmtime()</literal> — Time expressed as UTC |
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803 </listitem> |
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804 |
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805 <listitem> |
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806 <literal>ngx_localtime(), ngx_libc_localtime()</literal> — Time expressed |
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807 relative to the local time zone |
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808 </listitem> |
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809 |
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810 </list> |
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811 |
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812 The <literal>ngx_http_time(buf, time)</literal> function returns a string |
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813 representation suitable for use in HTTP headers (for example, |
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814 <literal>"Mon, 28 Sep 1970 06:00:00 GMT"</literal>). |
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815 The <literal>ngx_http_cookie_time(buf, time)</literal> returns a string |
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816 representation function returns a string representation suitable |
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817 for HTTP cookies (<literal>"Thu, 31-Dec-37 23:55:55 GMT"</literal>). |
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|
818 </para> |
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819 |
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820 </section> |
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821 |
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822 |
1899 | 823 <section name="Containers" id="containers"> |
824 | |
825 | |
826 <section name="Array" id="array"> | |
827 | |
828 <para> | |
829 The nginx array type <literal>ngx_array_t</literal> is defined as follows | |
830 </para> | |
831 | |
832 | |
833 <programlisting> | |
834 typedef struct { | |
835 void *elts; | |
836 ngx_uint_t nelts; | |
837 size_t size; | |
838 ngx_uint_t nalloc; | |
839 ngx_pool_t *pool; | |
840 } ngx_array_t; | |
841 </programlisting> | |
842 | |
843 <para> | |
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844 The elements of the array are available in the <literal>elts</literal> field. |
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845 The <literal>nelts</literal> field holds the number of elements. |
1899 | 846 The <literal>size</literal> field holds the size of a single element and is set |
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847 when the array is initialized. |
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848 </para> |
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849 |
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850 <para> |
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851 Use the <literal>ngx_array_create(pool, n, size)</literal> call to create an |
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852 array in a pool, and the <literal>ngx_array_init(array, pool, n, size)</literal> |
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853 call to initialize an array object that has already been allocated. |
1899 | 854 </para> |
855 | |
856 | |
857 <programlisting> | |
858 ngx_array_t *a, b; | |
859 | |
860 /* create an array of strings with preallocated memory for 10 elements */ | |
861 a = ngx_array_create(pool, 10, sizeof(ngx_str_t)); | |
862 | |
863 /* initialize string array for 10 elements */ | |
864 ngx_array_init(&b, pool, 10, sizeof(ngx_str_t)); | |
865 </programlisting> | |
866 | |
867 <para> | |
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868 Use the following functions to add elements to an array: |
1899 | 869 </para> |
870 | |
871 <para> | |
872 <list type="bullet"> | |
873 | |
874 <listitem> | |
875 <literal>ngx_array_push(a)</literal> adds one tail element and returns pointer | |
876 to it | |
877 </listitem> | |
878 | |
879 <listitem> | |
880 <literal>ngx_array_push_n(a, n)</literal> adds <literal>n</literal> tail elements | |
881 and returns pointer to the first one | |
882 </listitem> | |
883 | |
884 </list> | |
885 </para> | |
886 | |
887 <para> | |
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888 If the currently allocated amount of memory is not large enough to accommodate |
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889 the new elements, a new block of memory is allocated and the existing elements |
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|
890 are copied to it. |
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891 The new memory block is normally twice as large as the existing one. |
1899 | 892 </para> |
893 | |
894 | |
895 <programlisting> | |
896 s = ngx_array_push(a); | |
897 ss = ngx_array_push_n(&b, 3); | |
898 </programlisting> | |
899 | |
900 </section> | |
901 | |
902 | |
903 <section name="List" id="list"> | |
904 | |
905 <para> | |
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906 In nginx a list is a sequence of arrays, optimized for inserting a potentially |
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907 large number of items. |
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908 The <literal>ngx_list_t</literal> list type is defined as follows: |
1899 | 909 </para> |
910 | |
911 | |
912 <programlisting> | |
913 typedef struct { | |
914 ngx_list_part_t *last; | |
915 ngx_list_part_t part; | |
916 size_t size; | |
917 ngx_uint_t nalloc; | |
918 ngx_pool_t *pool; | |
919 } ngx_list_t; | |
920 </programlisting> | |
921 | |
922 <para> | |
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923 The actual items are stored in list parts, which are defined as follows: |
1899 | 924 </para> |
925 | |
926 | |
927 <programlisting> | |
928 typedef struct ngx_list_part_s ngx_list_part_t; | |
929 | |
930 struct ngx_list_part_s { | |
931 void *elts; | |
932 ngx_uint_t nelts; | |
933 ngx_list_part_t *next; | |
934 }; | |
935 </programlisting> | |
936 | |
937 <para> | |
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938 Before use, a list must be initialized by calling |
1899 | 939 <literal>ngx_list_init(list, pool, n, size)</literal> or created by calling |
940 <literal>ngx_list_create(pool, n, size)</literal>. | |
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941 Both functions take as arguments the size of a single item and a number of |
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942 items per list part. |
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943 To add an item to a list, use the <literal>ngx_list_push(list)</literal> |
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944 function. |
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945 To iterate over the items, directly access the list fields as shown in the |
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946 example: |
1899 | 947 </para> |
948 | |
949 | |
950 <programlisting> | |
951 ngx_str_t *v; | |
952 ngx_uint_t i; | |
953 ngx_list_t *list; | |
954 ngx_list_part_t *part; | |
955 | |
956 list = ngx_list_create(pool, 100, sizeof(ngx_str_t)); | |
957 if (list == NULL) { /* error */ } | |
958 | |
959 /* add items to the list */ | |
960 | |
961 v = ngx_list_push(list); | |
962 if (v == NULL) { /* error */ } | |
1936
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963 ngx_str_set(v, "foo"); |
1899 | 964 |
965 v = ngx_list_push(list); | |
966 if (v == NULL) { /* error */ } | |
1936
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967 ngx_str_set(v, "bar"); |
1899 | 968 |
969 /* iterate over the list */ | |
970 | |
971 part = &list->part; | |
972 v = part->elts; | |
973 | |
974 for (i = 0; /* void */; i++) { | |
975 | |
976 if (i >= part->nelts) { | |
977 if (part->next == NULL) { | |
978 break; | |
979 } | |
980 | |
981 part = part->next; | |
982 v = part->elts; | |
983 i = 0; | |
984 } | |
985 | |
986 ngx_do_smth(&v[i]); | |
987 } | |
988 </programlisting> | |
989 | |
990 <para> | |
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991 Lists are primarily used for HTTP input and output headers. |
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992 </para> |
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993 |
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994 <para> |
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995 Lists do not support item removal. |
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996 However, when needed, items can internally be marked as missing without actually |
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997 being removed from the list. |
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998 For example, to mark HTTP output headers (which are stored as |
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999 <literal>ngx_table_elt_t</literal> objects) as missing, set the |
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1000 <literal>hash</literal> field in <literal>ngx_table_elt_t</literal> to |
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1001 zero. |
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1002 Items marked in this way are explicitly skipped when the headers are iterated |
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1003 over. |
1899 | 1004 </para> |
1005 | |
1006 </section> | |
1007 | |
1008 | |
1009 <section name="Queue" id="queue"> | |
1010 | |
1011 <para> | |
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1012 In nginx a queue is an intrusive doubly linked list, with each node defined as |
1899 | 1013 follows: |
1014 </para> | |
1015 | |
1016 | |
1017 <programlisting> | |
1018 typedef struct ngx_queue_s ngx_queue_t; | |
1019 | |
1020 struct ngx_queue_s { | |
1021 ngx_queue_t *prev; | |
1022 ngx_queue_t *next; | |
1023 }; | |
1024 </programlisting> | |
1025 | |
1026 <para> | |
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1027 The head queue node is not linked with any data. |
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1028 Use the <literal>ngx_queue_init(q)</literal> call to initialize the list head |
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1029 before use. |
1899 | 1030 Queues support the following operations: |
1031 </para> | |
1032 | |
1033 <para> | |
1034 <list type="bullet"> | |
1035 | |
1036 <listitem> | |
1037 <literal>ngx_queue_insert_head(h, x)</literal>, | |
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1038 <literal>ngx_queue_insert_tail(h, x)</literal> — Insert a new node |
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1039 </listitem> |
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1040 |
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1041 <listitem> |
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1042 <literal>ngx_queue_remove(x)</literal> — Remove a queue node |
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1043 </listitem> |
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1044 |
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1045 <listitem> |
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1046 <literal>ngx_queue_split(h, q, n)</literal> — Split a queue at a node, |
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1047 returning the queue tail in a separate queue |
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1048 </listitem> |
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1049 |
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1050 <listitem> |
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1051 <literal>ngx_queue_add(h, n)</literal> — Add a second queue to the first queue |
1899 | 1052 </listitem> |
1053 | |
1054 <listitem> | |
1055 <literal>ngx_queue_head(h)</literal>, | |
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1056 <literal>ngx_queue_last(h)</literal> — Get first or last queue node |
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1057 </listitem> |
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1058 |
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1059 <listitem> |
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1060 <literal>ngx_queue_sentinel(h)</literal> - Get a queue sentinel object to end |
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1061 iteration at |
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1062 </listitem> |
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|
1063 |
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|
1064 <listitem> |
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|
1065 <literal>ngx_queue_data(q, type, link)</literal> — Get a reference to the |
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|
1066 beginning of a queue node data structure, considering the queue field offset in |
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|
1067 it |
1899 | 1068 </listitem> |
1069 | |
1070 </list> | |
1071 </para> | |
1072 | |
1073 <para> | |
1993
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|
1074 An example: |
1899 | 1075 </para> |
1076 | |
1077 | |
1078 <programlisting> | |
1079 typedef struct { | |
1080 ngx_str_t value; | |
1081 ngx_queue_t queue; | |
1082 } ngx_foo_t; | |
1083 | |
1084 ngx_foo_t *f; | |
2008
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Vladimir Homutov <vl@nginx.com>
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2007
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|
1085 ngx_queue_t values, *q; |
1899 | 1086 |
1087 ngx_queue_init(&values); | |
1088 | |
1089 f = ngx_palloc(pool, sizeof(ngx_foo_t)); | |
1090 if (f == NULL) { /* error */ } | |
1936
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|
1091 ngx_str_set(&f->value, "foo"); |
1899 | 1092 |
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2007
diff
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|
1093 ngx_queue_insert_tail(&values, &f->queue); |
1899 | 1094 |
1095 /* insert more nodes here */ | |
1096 | |
1097 for (q = ngx_queue_head(&values); | |
1098 q != ngx_queue_sentinel(&values); | |
1099 q = ngx_queue_next(q)) | |
1100 { | |
1101 f = ngx_queue_data(q, ngx_foo_t, queue); | |
1102 | |
1103 ngx_do_smth(&f->value); | |
1104 } | |
1105 </programlisting> | |
1106 | |
1107 </section> | |
1108 | |
1109 | |
1110 <section name="Red-Black tree" id="red_black_tree"> | |
1111 | |
1112 <para> | |
1915
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1113 The <path>src/core/ngx_rbtree.h</path> header file provides access to the |
1899 | 1114 effective implementation of red-black trees. |
1115 </para> | |
1116 | |
1117 | |
1118 <programlisting> | |
1119 typedef struct { | |
1120 ngx_rbtree_t rbtree; | |
1121 ngx_rbtree_node_t sentinel; | |
1122 | |
1123 /* custom per-tree data here */ | |
1124 } my_tree_t; | |
1125 | |
1126 typedef struct { | |
1127 ngx_rbtree_node_t rbnode; | |
1128 | |
1129 /* custom per-node data */ | |
1130 foo_t val; | |
1131 } my_node_t; | |
1132 </programlisting> | |
1133 | |
1134 <para> | |
1135 To deal with a tree as a whole, you need two nodes: root and sentinel. | |
1993
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|
1136 Typically, they are added to a custom structure, allowing you to |
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|
1137 organize your data into a tree in which the leaves contain a link to or embed |
1899 | 1138 your data. |
1139 </para> | |
1140 | |
1141 <para> | |
1142 To initialize a tree: | |
1143 </para> | |
1144 | |
1145 | |
1146 <programlisting> | |
1147 my_tree_t root; | |
1148 | |
1149 ngx_rbtree_init(&root.rbtree, &root.sentinel, insert_value_function); | |
1150 </programlisting> | |
1151 | |
1152 <para> | |
1993
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|
1153 To traverse a tree and insert new values, use the |
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|
1154 "<literal>insert_value</literal>" functions. |
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|
1155 For example, the <literal>ngx_str_rbtree_insert_value</literal> function deals |
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|
1156 with the <literal>ngx_str_t</literal> type. |
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|
1157 Its arguments are pointers to a root node of an insertion, the newly created |
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diff
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|
1158 node to be added, and a tree sentinel. |
1899 | 1159 </para> |
1160 | |
1161 | |
1162 <programlisting> | |
1163 void ngx_str_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
1164 ngx_rbtree_node_t *node, | |
1165 ngx_rbtree_node_t *sentinel) | |
1166 </programlisting> | |
1167 | |
1168 | |
1169 <para> | |
1170 The traversal is pretty straightforward and can be demonstrated with the | |
1171 following lookup function pattern: | |
1172 </para> | |
1173 | |
1174 | |
1175 <programlisting> | |
1176 my_node_t * | |
1177 my_rbtree_lookup(ngx_rbtree_t *rbtree, foo_t *val, uint32_t hash) | |
1178 { | |
1179 ngx_int_t rc; | |
1180 my_node_t *n; | |
1181 ngx_rbtree_node_t *node, *sentinel; | |
1182 | |
1183 node = rbtree->root; | |
1184 sentinel = rbtree->sentinel; | |
1185 | |
1186 while (node != sentinel) { | |
1187 | |
1188 n = (my_node_t *) node; | |
1189 | |
1190 if (hash != node->key) { | |
1191 node = (hash < node->key) ? node->left : node->right; | |
1192 continue; | |
1193 } | |
1194 | |
1195 rc = compare(val, node->val); | |
1196 | |
1197 if (rc < 0) { | |
1198 node = node->left; | |
1199 continue; | |
1200 } | |
1201 | |
1202 if (rc > 0) { | |
1203 node = node->right; | |
1204 continue; | |
1205 } | |
1206 | |
1207 return n; | |
1208 } | |
1209 | |
1210 return NULL; | |
1211 } | |
1212 </programlisting> | |
1213 | |
1214 <para> | |
1993
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|
1215 The <literal>compare()</literal> function is a classic comparator function that |
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diff
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|
1216 returns a value less than, equal to, or greater than zero. |
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|
1217 To speed up lookups and avoid comparing user objects that can be big, an integer |
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|
1218 hash field is used. |
1899 | 1219 </para> |
1220 | |
1221 <para> | |
1222 To add a node to a tree, allocate a new node, initialize it and call | |
1223 <literal>ngx_rbtree_insert()</literal>: | |
1224 </para> | |
1225 | |
1226 | |
1227 <programlisting> | |
1228 my_node_t *my_node; | |
1229 ngx_rbtree_node_t *node; | |
1230 | |
1231 my_node = ngx_palloc(...); | |
1232 init_custom_data(&my_node->val); | |
1233 | |
1234 node = &my_node->rbnode; | |
1235 node->key = create_key(my_node->val); | |
1236 | |
1237 ngx_rbtree_insert(&root->rbtree, node); | |
1238 </programlisting> | |
1239 | |
1240 <para> | |
1993
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|
1241 To remove a node, call the <literal>ngx_rbtree_delete()</literal> function: |
1899 | 1242 </para> |
1243 | |
1244 | |
1245 <programlisting> | |
1246 ngx_rbtree_delete(&root->rbtree, node); | |
1247 </programlisting> | |
1248 | |
1249 </section> | |
1250 | |
1914
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diff
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|
1251 <section name="Hash" id="hash"> |
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diff
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|
1252 |
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diff
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|
1253 <para> |
1920 | 1254 Hash table functions are declared in <path>src/core/ngx_hash.h</path>. |
1993
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|
1255 Both exact and wildcard matching are supported. |
1914
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diff
changeset
|
1256 The latter requires extra setup and is described in a separate section below. |
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diff
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|
1257 </para> |
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diff
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|
1258 |
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|
1259 <para> |
1993
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|
1260 Before initializing a hash, you need to know the number of elements it will |
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diff
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|
1261 hold so that nginx can build it optimally. |
1914
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Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
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|
1262 Two parameters that need to be configured are <literal>max_size</literal> |
1993
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diff
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|
1263 and <literal>bucket_size</literal>, as detailed in a separate |
1914
f8659301a260
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diff
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|
1264 <link doc="../hash.xml">document</link>. |
1993
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|
1265 They are usually configurable by the user. |
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|
1266 Hash initialization settings are stored with the |
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|
1267 <literal>ngx_hash_init_t</literal> type, and the hash itself is |
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|
1268 <literal>ngx_hash_t</literal>: |
1914
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Added hash API description.
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diff
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|
1269 <programlisting> |
f8659301a260
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diff
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|
1270 ngx_hash_t foo_hash; |
f8659301a260
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1907
diff
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|
1271 ngx_hash_init_t hash; |
f8659301a260
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parents:
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diff
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|
1272 |
f8659301a260
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diff
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|
1273 hash.hash = &foo_hash; |
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diff
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|
1274 hash.key = ngx_hash_key; |
f8659301a260
Added hash API description.
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parents:
1907
diff
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|
1275 hash.max_size = 512; |
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diff
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|
1276 hash.bucket_size = ngx_align(64, ngx_cacheline_size); |
f8659301a260
Added hash API description.
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diff
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|
1277 hash.name = "foo_hash"; |
f8659301a260
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diff
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|
1278 hash.pool = cf->pool; |
f8659301a260
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diff
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|
1279 hash.temp_pool = cf->temp_pool; |
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diff
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|
1280 </programlisting> |
1993
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|
1281 The <literal>key</literal> is a pointer to a function that creates the hash |
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|
1282 integer key from a string. |
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|
1283 There are two generic key-creation functions: |
1914
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|
1284 <literal>ngx_hash_key(data, len)</literal> and |
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diff
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|
1285 <literal>ngx_hash_key_lc(data, len)</literal>. |
1993
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|
1286 The latter converts a string to all lowercase characters, so the passed string |
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|
1287 must be writeable. |
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|
1288 If that is not true, pass the <literal>NGX_HASH_READONLY_KEY</literal> flag |
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|
1289 to the function, initializing the key array (see below). |
1914
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|
1290 </para> |
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|
1291 |
f8659301a260
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|
1292 <para> |
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|
1293 The hash keys are stored in <literal>ngx_hash_keys_arrays_t</literal> and |
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1907
diff
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|
1294 are initialized with <literal>ngx_hash_keys_array_init(arr, type)</literal>: |
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1295 The second parameter (<literal>type</literal>) controls the amount of resources |
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|
1296 preallocated for the hash and can be either <literal>NGX_HASH_SMALL</literal> or |
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|
1297 <literal>NGX_HASH_LARGE</literal>. |
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|
1298 The latter is appropriate if you expect the hash to contain thousands of |
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|
1299 elements. |
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|
1300 |
1914
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|
1301 <programlisting> |
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|
1302 ngx_hash_keys_arrays_t foo_keys; |
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|
1303 |
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|
1304 foo_keys.pool = cf->pool; |
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|
1305 foo_keys.temp_pool = cf->temp_pool; |
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|
1306 |
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|
1307 ngx_hash_keys_array_init(&foo_keys, NGX_HASH_SMALL); |
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diff
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|
1308 </programlisting> |
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1309 </para> |
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|
1310 |
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|
1311 <para> |
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|
1312 To insert keys into a hash keys array, use the |
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|
1313 <literal>ngx_hash_add_key(keys_array, key, value, flags)</literal> function: |
1914
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|
1314 <programlisting> |
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|
1315 ngx_str_t k1 = ngx_string("key1"); |
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|
1316 ngx_str_t k2 = ngx_string("key2"); |
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|
1317 |
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|
1318 ngx_hash_add_key(&foo_keys, &k1, &my_data_ptr_1, NGX_HASH_READONLY_KEY); |
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|
1319 ngx_hash_add_key(&foo_keys, &k2, &my_data_ptr_2, NGX_HASH_READONLY_KEY); |
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|
1320 </programlisting> |
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diff
changeset
|
1321 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1322 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1323 <para> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1324 To build the hash table, call the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1325 <literal>ngx_hash_init(hinit, key_names, nelts)</literal> function: |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1326 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1327 <programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1328 ngx_hash_init(&hash, foo_keys.keys.elts, foo_keys.keys.nelts); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1329 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1330 |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1331 The function fails if <literal>max_size</literal> or |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1332 <literal>bucket_size</literal> parameters are not big enough. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1333 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1334 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1335 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1336 When the hash is built, use the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1337 <literal>ngx_hash_find(hash, key, name, len)</literal> function to look up |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1338 elements: |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1339 <programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1340 my_data_t *data; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1341 ngx_uint_t key; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1342 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1343 key = ngx_hash_key(k1.data, k1.len); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1344 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1345 data = ngx_hash_find(&foo_hash, key, k1.data, k1.len); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1346 if (data == NULL) { |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1347 /* key not found */ |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1348 } |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1349 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1350 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1351 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1352 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1353 <section name="Wildcard matching" id="wildcard_matching"> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1354 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1355 <para> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1356 To create a hash that works with wildcards, use the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1357 <literal>ngx_hash_combined_t</literal> type. |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1358 It includes the hash type described above and has two additional keys arrays: |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1359 <literal>dns_wc_head</literal> and <literal>dns_wc_tail</literal>. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1360 The initialization of basic properties is similar to a regular hash: |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1361 <programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1362 ngx_hash_init_t hash |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1363 ngx_hash_combined_t foo_hash; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1364 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1365 hash.hash = &foo_hash.hash; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1366 hash.key = ...; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1367 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1368 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1369 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1370 <para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1371 It is possible to add wildcard keys using the |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1372 <literal>NGX_HASH_WILDCARD_KEY</literal> flag: |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1373 <programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1374 /* k1 = ".example.org"; */ |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1375 /* k2 = "foo.*"; */ |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1376 ngx_hash_add_key(&foo_keys, &k1, &data1, NGX_HASH_WILDCARD_KEY); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1377 ngx_hash_add_key(&foo_keys, &k2, &data2, NGX_HASH_WILDCARD_KEY); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1378 </programlisting> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1379 The function recognizes wildcards and adds keys into the corresponding arrays. |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1380 Please refer to the |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1381 <link doc="../http/ngx_http_map_module.xml" id="map"/> module |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1382 documentation for the description of the wildcard syntax and the |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1383 matching algorithm. |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1384 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1385 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1386 <para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1387 Depending on the contents of added keys, you may need to initialize up to three |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1388 key arrays: one for exact matching (described above), and two more to enable |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1389 matching starting from the head or tail of a string: |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1390 <programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1391 if (foo_keys.dns_wc_head.nelts) { |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1392 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1393 ngx_qsort(foo_keys.dns_wc_head.elts, |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1394 (size_t) foo_keys.dns_wc_head.nelts, |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1395 sizeof(ngx_hash_key_t), |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1396 cmp_dns_wildcards); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1397 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1398 hash.hash = NULL; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1399 hash.temp_pool = pool; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1400 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1401 if (ngx_hash_wildcard_init(&hash, foo_keys.dns_wc_head.elts, |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1402 foo_keys.dns_wc_head.nelts) |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1403 != NGX_OK) |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1404 { |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1405 return NGX_ERROR; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1406 } |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1407 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1408 foo_hash.wc_head = (ngx_hash_wildcard_t *) hash.hash; |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1409 } |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1410 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1411 The keys array needs to be sorted, and initialization results must be added |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1412 to the combined hash. |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1413 The initialization of <literal>dns_wc_tail</literal> array is done similarly. |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1414 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1415 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1416 <para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1417 The lookup in a combined hash is handled by the |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1418 <literal>ngx_hash_find_combined(chash, key, name, len)</literal>: |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1419 <programlisting> |
1935
be7490a66d1b
Style: use long dash with non-breaking space where appropriate.
Vladimir Homutov <vl@nginx.com>
parents:
1932
diff
changeset
|
1420 /* key = "bar.example.org"; — will match ".example.org" */ |
be7490a66d1b
Style: use long dash with non-breaking space where appropriate.
Vladimir Homutov <vl@nginx.com>
parents:
1932
diff
changeset
|
1421 /* key = "foo.example.com"; — will match "foo.*" */ |
1914
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1422 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1423 hkey = ngx_hash_key(key.data, key.len); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1424 res = ngx_hash_find_combined(&foo_hash, hkey, key.data, key.len); |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1425 </programlisting> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1426 </para> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1427 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1428 </section> |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1429 |
f8659301a260
Added hash API description.
Vladimir Homutov <vl@nginx.com>
parents:
1907
diff
changeset
|
1430 </section> |
1899 | 1431 |
1432 </section> | |
1433 | |
1434 | |
1435 <section name="Memory management" id="memory_management"> | |
1436 | |
1437 | |
1438 <section name="Heap" id="heap"> | |
1439 | |
1440 <para> | |
1993
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1441 To allocate memory from system heap, use the following functions: |
1899 | 1442 </para> |
1443 | |
1444 <para> | |
1445 <list type="bullet"> | |
1446 | |
1447 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1448 <literal>ngx_alloc(size, log)</literal> — Allocate memory from system heap. |
1899 | 1449 This is a wrapper around <literal>malloc()</literal> with logging support. |
1993
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1450 Allocation error and debugging information is logged to <literal>log</literal>. |
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Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1451 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1452 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1453 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1454 <literal>ngx_calloc(size, log)</literal> — Allocate memory from system heap |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1455 like <literal>ngx_alloc()</literal>, but fill memory with zeros after |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1456 allocation. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1457 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1458 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1459 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1460 <literal>ngx_memalign(alignment, size, log)</literal> — Allocate aligned memory |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1461 from system heap. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1462 This is a wrapper around <literal>posix_memalign()</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1463 on those platforms that provide that function. |
1899 | 1464 Otherwise implementation falls back to <literal>ngx_alloc()</literal> which |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1465 provides maximum alignment. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1466 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1467 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1468 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1469 <literal>ngx_free(p)</literal> — Free allocated memory. |
1899 | 1470 This is a wrapper around <literal>free()</literal> |
1471 </listitem> | |
1472 | |
1473 </list> | |
1474 </para> | |
1475 | |
1476 </section> | |
1477 | |
1478 | |
1479 <section name="Pool" id="pool"> | |
1480 | |
1481 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1482 Most nginx allocations are done in pools. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1483 Memory allocated in an nginx pool is freed automatically when the pool is |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1484 destroyed. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1485 This provides good allocation performance and makes memory control easy. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1486 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1487 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1488 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1489 A pool internally allocates objects in continuous blocks of memory. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1490 Once a block is full, a new one is allocated and added to the pool memory |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1491 block list. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1492 When the requested allocation is too large to fit into a block, the request |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1493 is forwarded to the system allocator and the |
1899 | 1494 returned pointer is stored in the pool for further deallocation. |
1495 </para> | |
1496 | |
1497 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1498 The type for nginx pools is <literal>ngx_pool_t</literal>. |
1899 | 1499 The following operations are supported: |
1500 </para> | |
1501 | |
1502 <para> | |
1503 <list type="bullet"> | |
1504 | |
1505 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1506 <literal>ngx_create_pool(size, log)</literal> — Create a pool with specified |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1507 block size. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1508 The pool object returned is allocated in the pool as well. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1509 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1510 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1511 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1512 <literal>ngx_destroy_pool(pool)</literal> — Free all pool memory, including |
1899 | 1513 the pool object itself. |
1514 </listitem> | |
1515 | |
1516 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1517 <literal>ngx_palloc(pool, size)</literal> — Allocate aligned memory from the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1518 specified pool. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1519 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1520 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1521 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1522 <literal>ngx_pcalloc(pool, size)</literal> — Allocate aligned memory |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1523 from the specified pool and fill it with zeroes. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1524 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1525 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1526 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1527 <literal>ngx_pnalloc(pool, size)</literal> — Allocate unaligned memory from the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1528 specified pool. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1529 Mostly used for allocating strings. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1530 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1531 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1532 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1533 <literal>ngx_pfree(pool, p)</literal> — Free memory that was previously |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1534 allocated in the specified pool. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1535 Only allocations that result from requests forwarded to the system allocator |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1536 can be freed. |
1899 | 1537 </listitem> |
1538 | |
1539 </list> | |
1540 </para> | |
1541 | |
1542 <programlisting> | |
1543 u_char *p; | |
1544 ngx_str_t *s; | |
1545 ngx_pool_t *pool; | |
1546 | |
1547 pool = ngx_create_pool(1024, log); | |
1548 if (pool == NULL) { /* error */ } | |
1549 | |
1550 s = ngx_palloc(pool, sizeof(ngx_str_t)); | |
1551 if (s == NULL) { /* error */ } | |
1936
8f996938fe23
Style: proper quotes usage.
Vladimir Homutov <vl@nginx.com>
parents:
1935
diff
changeset
|
1552 ngx_str_set(s, "foo"); |
1899 | 1553 |
1554 p = ngx_pnalloc(pool, 3); | |
1555 if (p == NULL) { /* error */ } | |
1936
8f996938fe23
Style: proper quotes usage.
Vladimir Homutov <vl@nginx.com>
parents:
1935
diff
changeset
|
1556 ngx_memcpy(p, "foo", 3); |
1899 | 1557 </programlisting> |
1558 | |
1559 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1560 Chain links (<literal>ngx_chain_t</literal>) are actively used in nginx, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1561 so the nginx pool implementation provides a way to reuse them. |
1899 | 1562 The <literal>chain</literal> field of <literal>ngx_pool_t</literal> keeps a |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1563 list of previously allocated links ready for reuse. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1564 For efficient allocation of a chain link in a pool, use the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1565 <literal>ngx_alloc_chain_link(pool)</literal> function. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1566 This function looks up a free chain link in the pool list and allocates a new |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1567 chain link if the pool list is empty. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1568 To free a link, call the <literal>ngx_free_chain(pool, cl)</literal> function. |
1899 | 1569 </para> |
1570 | |
1571 <para> | |
1572 Cleanup handlers can be registered in a pool. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1573 A cleanup handler is a callback with an argument which is called when pool is |
1899 | 1574 destroyed. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1575 A pool is usually tied to a specific nginx object (like an HTTP request) and is |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1576 destroyed when the object reaches the end of its lifetime. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1577 Registering a pool cleanup is a convenient way to release resources, close |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1578 file descriptors or make final adjustments to the shared data associated with |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1579 the main object. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1580 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1581 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1582 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1583 To register a pool cleanup, call |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1584 <literal>ngx_pool_cleanup_add(pool, size)</literal>, which returns a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1585 <literal>ngx_pool_cleanup_t</literal> pointer to |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1586 be filled in by the caller. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1587 Use the <literal>size</literal> argument to allocate context for the cleanup |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1588 handler. |
1899 | 1589 </para> |
1590 | |
1591 | |
1592 <programlisting> | |
1593 ngx_pool_cleanup_t *cln; | |
1594 | |
1595 cln = ngx_pool_cleanup_add(pool, 0); | |
1596 if (cln == NULL) { /* error */ } | |
1597 | |
1598 cln->handler = ngx_my_cleanup; | |
1936
8f996938fe23
Style: proper quotes usage.
Vladimir Homutov <vl@nginx.com>
parents:
1935
diff
changeset
|
1599 cln->data = "foo"; |
1899 | 1600 |
1601 ... | |
1602 | |
1603 static void | |
1604 ngx_my_cleanup(void *data) | |
1605 { | |
1606 u_char *msg = data; | |
1607 | |
1608 ngx_do_smth(msg); | |
1609 } | |
1610 </programlisting> | |
1611 | |
1612 </section> | |
1613 | |
1614 | |
1615 <section name="Shared memory" id="shared_memory"> | |
1616 | |
1617 <para> | |
1618 Shared memory is used by nginx to share common data between processes. | |
1993
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1619 The <literal>ngx_shared_memory_add(cf, name, size, tag)</literal> function adds |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1620 a new shared memory entry <literal>ngx_shm_zone_t</literal> to a cycle. |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1621 The function receives the <literal>name</literal> and <literal>size</literal> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1622 of the zone. |
1899 | 1623 Each shared zone must have a unique name. |
1993
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Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1624 If a shared zone entry with the provided <literal>name</literal> and |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1625 <literal>tag</literal> already exists, the existing zone entry is reused. |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1626 The function fails with an error if an existing entry with the same name has a |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1627 different tag. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1628 Usually, the address of the module structure is passed as |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1629 <literal>tag</literal>, making it possible to reuse shared zones by name within |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1630 one nginx module. |
1899 | 1631 </para> |
1632 | |
1633 <para> | |
1634 The shared memory entry structure <literal>ngx_shm_zone_t</literal> has the | |
1635 following fields: | |
1636 </para> | |
1637 | |
1638 <para> | |
1639 <list type="bullet"> | |
1640 | |
1641 <listitem> | |
1993
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1642 <literal>init</literal> — Initialization callback, called after the shared zone |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
1643 is mapped to actual memory |
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Language and style fixes in development guide.
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parents:
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diff
changeset
|
1644 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
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diff
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|
1645 |
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Language and style fixes in development guide.
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|
1646 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1647 <literal>data</literal> — Data context, used to pass arbitrary data to the |
1899 | 1648 <literal>init</literal> callback |
1649 </listitem> | |
1650 | |
1651 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1652 <literal>noreuse</literal> — Flag that disables reuse of a shared zone from the |
1899 | 1653 old cycle |
1654 </listitem> | |
1655 | |
1656 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1657 <literal>tag</literal> — Shared zone tag |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1658 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1659 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1660 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1661 <literal>shm</literal> — Platform-specific object of type |
1899 | 1662 <literal>ngx_shm_t</literal>, having at least the following fields: |
1663 <list type="bullet"> | |
1664 | |
1665 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1666 <literal>addr</literal> — Mapped shared memory address, initially NULL |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1667 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1668 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
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diff
changeset
|
1669 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
1670 <literal>size</literal> — Shared memory size |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
1671 </listitem> |
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1672 |
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1673 <listitem> |
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1674 <literal>name</literal> — Shared memory name |
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|
1675 </listitem> |
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|
1676 |
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|
1677 <listitem> |
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1678 <literal>log</literal> — Shared memory log |
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1679 </listitem> |
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1680 |
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1681 <listitem> |
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1682 <literal>exists</literal> — Flag that indicates shared memory was inherited |
1899 | 1683 from the master process (Windows-specific) |
1684 </listitem> | |
1685 | |
1686 </list> | |
1687 </listitem> | |
1688 | |
1689 </list> | |
1690 </para> | |
1691 | |
1692 <para> | |
1693 Shared zone entries are mapped to actual memory in | |
1993
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1694 <literal>ngx_init_cycle()</literal> after the configuration is parsed. |
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1695 On POSIX systems, the <literal>mmap()</literal> syscall is used to create the |
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1696 shared anonymous mapping. |
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1697 On Windows, the <literal>CreateFileMapping()</literal>/ |
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1698 <literal>MapViewOfFileEx()</literal> pair is used. |
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1699 </para> |
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1700 |
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1701 <para> |
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1702 For allocating in shared memory, nginx provides the slab pool |
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1703 <literal>ngx_slab_pool_t</literal> type. |
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1704 A slab pool for allocating memory is automatically created in each nginx shared |
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1705 zone. |
1899 | 1706 The pool is located in the beginning of the shared zone and can be accessed by |
1707 the expression <literal>(ngx_slab_pool_t *) shm_zone->shm.addr</literal>. | |
1993
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1708 To allocate memory in a shared zone, call either |
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1709 <literal>ngx_slab_alloc(pool, size)</literal> or |
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1710 <literal>ngx_slab_calloc(pool, size)</literal>. |
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1711 To free memory, call <literal>ngx_slab_free(pool, p)</literal>. |
1899 | 1712 </para> |
1713 | |
1714 <para> | |
1715 Slab pool divides all shared zone into pages. | |
1716 Each page is used for allocating objects of the same size. | |
1993
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1717 The specified size must be a power of 2, and greater than the minimum size of |
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1718 8 bytes. |
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1719 Nonconforming values are rounded up. |
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1720 A bitmask for each page tracks which blocks are in use and which are free for |
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1721 allocation. |
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1722 For sizes greater than a half page (which is usually 2048 bytes), allocation is |
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1723 done an entire page at a time |
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1724 </para> |
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1725 |
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1726 <para> |
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1727 To protect data in shared memory from concurrent access, use the mutex |
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1728 available in the <literal>mutex</literal> field of |
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1729 <literal>ngx_slab_pool_t</literal>. |
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1730 A mutex is most commonly used by the slab pool while allocating and freeing |
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1731 memory, but it can be used to protect any other user data structures allocated |
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1732 in the shared zone. |
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1733 To lock or unlock a mutex, call |
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1734 <literal>ngx_shmtx_lock(&shpool->mutex)</literal> or |
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1735 <literal>ngx_shmtx_unlock(&shpool->mutex)</literal> respectively. |
1899 | 1736 </para> |
1737 | |
1738 | |
1739 <programlisting> | |
1740 ngx_str_t name; | |
1741 ngx_foo_ctx_t *ctx; | |
1742 ngx_shm_zone_t *shm_zone; | |
1743 | |
1744 ngx_str_set(&name, "foo"); | |
1745 | |
1746 /* allocate shared zone context */ | |
1747 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_foo_ctx_t)); | |
1748 if (ctx == NULL) { | |
1749 /* error */ | |
1750 } | |
1751 | |
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1752 /* add an entry for 64k shared zone */ |
1899 | 1753 shm_zone = ngx_shared_memory_add(cf, &name, 65536, &ngx_foo_module); |
1754 if (shm_zone == NULL) { | |
1755 /* error */ | |
1756 } | |
1757 | |
1758 /* register init callback and context */ | |
1759 shm_zone->init = ngx_foo_init_zone; | |
1760 shm_zone->data = ctx; | |
1761 | |
1762 | |
1763 ... | |
1764 | |
1765 | |
1766 static ngx_int_t | |
1767 ngx_foo_init_zone(ngx_shm_zone_t *shm_zone, void *data) | |
1768 { | |
1769 ngx_foo_ctx_t *octx = data; | |
1770 | |
1771 size_t len; | |
1772 ngx_foo_ctx_t *ctx; | |
1773 ngx_slab_pool_t *shpool; | |
1774 | |
1775 value = shm_zone->data; | |
1776 | |
1777 if (octx) { | |
1778 /* reusing a shared zone from old cycle */ | |
1779 ctx->value = octx->value; | |
1780 return NGX_OK; | |
1781 } | |
1782 | |
1783 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; | |
1784 | |
1785 if (shm_zone->shm.exists) { | |
1786 /* initialize shared zone context in Windows nginx worker */ | |
1787 ctx->value = shpool->data; | |
1788 return NGX_OK; | |
1789 } | |
1790 | |
1791 /* initialize shared zone */ | |
1792 | |
1793 ctx->value = ngx_slab_alloc(shpool, sizeof(ngx_uint_t)); | |
1794 if (ctx->value == NULL) { | |
1795 return NGX_ERROR; | |
1796 } | |
1797 | |
1798 shpool->data = ctx->value; | |
1799 | |
1800 return NGX_OK; | |
1801 } | |
1802 </programlisting> | |
1803 | |
1804 </section> | |
1805 | |
1806 | |
1807 </section> | |
1808 | |
1809 | |
1810 <section name="Logging" id="logging"> | |
1811 | |
1812 <para> | |
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1813 For logging nginx uses <literal>ngx_log_t</literal> objects. |
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1814 The nginx logger supports several types of output: |
1899 | 1815 |
1816 <list type="bullet"> | |
1817 | |
1818 <listitem> | |
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1819 stderr — Logging to standard error (stderr) |
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1820 </listitem> |
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1821 |
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1822 <listitem> |
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1823 file — Logging to a file |
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1824 </listitem> |
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1825 |
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1826 <listitem> |
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1827 syslog — Logging to syslog |
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1828 </listitem> |
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1829 |
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1830 <listitem> |
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1831 memory — Logging to internal memory storage for development purposes; the memory |
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1832 can be accessed later with a debugger |
1899 | 1833 </listitem> |
1834 | |
1835 </list> | |
1836 </para> | |
1837 | |
1838 <para> | |
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1839 A logger instance can be a chain of loggers, linked to each other with |
1899 | 1840 the <literal>next</literal> field. |
1993
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1841 In this case, each message is written to all loggers in the chain. |
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1842 </para> |
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1843 |
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1844 <para> |
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1845 For each logger, a severity level controls which messages are written to the |
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1846 log (only events assigned that level or higher are logged). |
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1847 The following severity levels are supported: |
1899 | 1848 </para> |
1849 | |
1850 <para> | |
1851 <list type="bullet"> | |
1852 | |
1853 <listitem> | |
1854 <literal>NGX_LOG_EMERG</literal> | |
1855 </listitem> | |
1856 | |
1857 <listitem> | |
1858 <literal>NGX_LOG_ALERT</literal> | |
1859 </listitem> | |
1860 | |
1861 <listitem> | |
1862 <literal>NGX_LOG_CRIT</literal> | |
1863 </listitem> | |
1864 | |
1865 <listitem> | |
1866 <literal>NGX_LOG_ERR</literal> | |
1867 </listitem> | |
1868 | |
1869 <listitem> | |
1870 <literal>NGX_LOG_WARN</literal> | |
1871 </listitem> | |
1872 | |
1873 <listitem> | |
1874 <literal>NGX_LOG_NOTICE</literal> | |
1875 </listitem> | |
1876 | |
1877 <listitem> | |
1878 <literal>NGX_LOG_INFO</literal> | |
1879 </listitem> | |
1880 | |
1881 <listitem> | |
1882 <literal>NGX_LOG_DEBUG</literal> | |
1883 </listitem> | |
1884 | |
1885 </list> | |
1886 </para> | |
1887 | |
1888 <para> | |
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1889 For debug logging, the debug mask is checked as well. |
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1890 The debug masks are: |
1899 | 1891 </para> |
1892 | |
1893 <para> | |
1894 <list type="bullet"> | |
1895 | |
1896 <listitem> | |
1897 <literal>NGX_LOG_DEBUG_CORE</literal> | |
1898 </listitem> | |
1899 | |
1900 <listitem> | |
1901 <literal>NGX_LOG_DEBUG_ALLOC</literal> | |
1902 </listitem> | |
1903 | |
1904 <listitem> | |
1905 <literal>NGX_LOG_DEBUG_MUTEX</literal> | |
1906 </listitem> | |
1907 | |
1908 <listitem> | |
1909 <literal>NGX_LOG_DEBUG_EVENT</literal> | |
1910 </listitem> | |
1911 | |
1912 <listitem> | |
1913 <literal>NGX_LOG_DEBUG_HTTP</literal> | |
1914 </listitem> | |
1915 | |
1916 <listitem> | |
1917 <literal>NGX_LOG_DEBUG_MAIL</literal> | |
1918 </listitem> | |
1919 | |
1920 <listitem> | |
1921 <literal>NGX_LOG_DEBUG_STREAM</literal> | |
1922 </listitem> | |
1923 | |
1924 </list> | |
1925 </para> | |
1926 | |
1927 <para> | |
1928 Normally, loggers are created by existing nginx code from | |
1929 <literal>error_log</literal> directives and are available at nearly every stage | |
1930 of processing in cycle, configuration, client connection and other objects. | |
1931 </para> | |
1932 | |
1933 <para> | |
1934 Nginx provides the following logging macros: | |
1935 </para> | |
1936 | |
1937 <para> | |
1938 <list type="bullet"> | |
1939 | |
1940 <listitem> | |
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1941 <literal>ngx_log_error(level, log, err, fmt, ...)</literal> — Error logging |
1899 | 1942 </listitem> |
1943 | |
1944 <listitem> | |
1945 <literal>ngx_log_debug0(level, log, err, fmt)</literal>, | |
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1946 <literal>ngx_log_debug1(level, log, err, fmt, arg1)</literal> etc — Debug |
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1947 logging with up to eight supported formatting arguments |
1899 | 1948 </listitem> |
1949 | |
1950 </list> | |
1951 </para> | |
1952 | |
1953 <para> | |
1954 A log message is formatted in a buffer of size | |
1955 <literal>NGX_MAX_ERROR_STR</literal> (currently, 2048 bytes) on stack. | |
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1956 The message is prepended with the severity level, process ID (PID), connection |
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1957 ID (stored in <literal>log->connection</literal>), and the system error text. |
1899 | 1958 For non-debug messages <literal>log->handler</literal> is called as well to |
1959 prepend more specific information to the log message. | |
1960 HTTP module sets <literal>ngx_http_log_error()</literal> function as log | |
1961 handler to log client and server addresses, current action (stored in | |
1962 <literal>log->action</literal>), client request line, server name etc. | |
1963 </para> | |
1964 | |
1965 <programlisting> | |
1966 /* specify what is currently done */ | |
1967 log->action = "sending mp4 to client”; | |
1968 | |
1969 /* error and debug log */ | |
1970 ngx_log_error(NGX_LOG_INFO, c->log, 0, "client prematurely | |
1971 closed connection”); | |
1972 | |
1973 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, mp4->file.log, 0, | |
1974 "mp4 start:%ui, length:%ui”, mp4->start, mp4->length); | |
1975 </programlisting> | |
1976 | |
1977 <para> | |
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1978 The example above results in log entries like these: |
1899 | 1979 </para> |
1980 | |
1981 | |
1982 <programlisting> | |
1983 2016/09/16 22:08:52 [info] 17445#0: *1 client prematurely closed connection while | |
1984 sending mp4 to client, client: 127.0.0.1, server: , request: "GET /file.mp4 HTTP/1.1” | |
1985 2016/09/16 23:28:33 [debug] 22140#0: *1 mp4 start:0, length:10000 | |
1986 </programlisting> | |
1987 | |
1988 </section> | |
1989 | |
1990 | |
1991 <section name="Cycle" id="cycle"> | |
1992 | |
1993 <para> | |
1993
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1994 A cycle object stores the nginx runtime context created from a specific |
1899 | 1995 configuration. |
1993
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|
1996 Its type is <literal>ngx_cycle_t</literal>. |
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|
1997 The current cycle is referenced by the <literal>ngx_cycle</literal> global |
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|
1998 variable and inherited by nginx workers as they start. |
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|
1999 Each time the nginx configuration is reloaded, a new cycle is created from the |
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|
2000 new nginx configuration; the old cycle is usually deleted after the new one is |
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|
2001 successfully created. |
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|
2002 </para> |
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|
2003 |
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|
2004 <para> |
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|
2005 A cycle is created by the <literal>ngx_init_cycle()</literal> function, which |
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|
2006 takes the previous cycle as its argument. |
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|
2007 The function locates the previous cycle's configuration file and inherits as |
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|
2008 many resources as possible from the previous cycle. |
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|
2009 A placeholder cycle called "init cycle" is created as nginx start, then is |
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|
2010 replaced by an actual cycle built from configuration. |
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|
2011 </para> |
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|
2012 |
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|
2013 <para> |
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|
2014 Members of the cycle include: |
1899 | 2015 </para> |
2016 | |
2017 <para> | |
2018 <list type="bullet"> | |
2019 | |
2020 <listitem> | |
1993
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|
2021 <literal>pool</literal> — Cycle pool. |
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|
2022 Created for each new cycle. |
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|
2023 </listitem> |
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|
2024 |
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|
2025 <listitem> |
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|
2026 <literal>log</literal> — Cycle log. |
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Language and style fixes in development guide.
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|
2027 Initially inherited from the old cycle, it is set to point to |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
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|
2028 <literal>new_log</literal> after the configuration is read. |
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|
2029 </listitem> |
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|
2030 |
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|
2031 <listitem> |
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|
2032 <literal>new_log</literal> — Cycle log, created by the configuration. |
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Language and style fixes in development guide.
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1983
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|
2033 It's affected by the root-scope <literal>error_log</literal> directive. |
1899 | 2034 </listitem> |
2035 | |
2036 <listitem> | |
1981
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Fixes in cycle section of the development guide.
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1980
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|
2037 <literal>connections</literal>, <literal>connection_n</literal> — |
1993
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|
2038 Array of connections of type <literal>ngx_connection_t</literal>, created by |
1899 | 2039 the event module while initializing each nginx worker. |
1993
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|
2040 The <literal>worker_connections</literal> directive in the nginx configuration |
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1983
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|
2041 sets the number of connections <literal>connection_n</literal>. |
1899 | 2042 </listitem> |
2043 | |
2044 <listitem> | |
2045 <literal>free_connections</literal>, | |
1993
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1983
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|
2046 <literal>free_connection_n</literal> — List and number of currently available |
1899 | 2047 connections. |
1993
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Language and style fixes in development guide.
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1983
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|
2048 If no connections are available, an nginx worker refuses to accept new clients |
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Language and style fixes in development guide.
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1983
diff
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|
2049 or connect to upstream servers. |
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changeset
|
2050 </listitem> |
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Language and style fixes in development guide.
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|
2051 |
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|
2052 <listitem> |
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Language and style fixes in development guide.
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1983
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|
2053 <literal>files</literal>, <literal>files_n</literal> — Array for mapping file |
1899 | 2054 descriptors to nginx connections. |
2055 This mapping is used by the event modules, having the | |
1993
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Language and style fixes in development guide.
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1983
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|
2056 <literal>NGX_USE_FD_EVENT</literal> flag (currently, it's |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2057 <literal>poll</literal> and <literal>devpoll</literal>). |
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Language and style fixes in development guide.
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1983
diff
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|
2058 </listitem> |
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Language and style fixes in development guide.
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1983
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|
2059 |
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|
2060 <listitem> |
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1983
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changeset
|
2061 <literal>conf_ctx</literal> — Array of core module configurations. |
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Language and style fixes in development guide.
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1983
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|
2062 The configurations are created and filled during reading of nginx configuration |
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Language and style fixes in development guide.
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|
2063 files. |
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Language and style fixes in development guide.
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|
2064 </listitem> |
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Language and style fixes in development guide.
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1983
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|
2065 |
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Language and style fixes in development guide.
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|
2066 <listitem> |
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Language and style fixes in development guide.
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1983
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|
2067 <literal>modules</literal>, <literal>modules_n</literal> — Array of modules |
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Language and style fixes in development guide.
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1983
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|
2068 of type <literal>ngx_module_t</literal>, both static and dynamic, loaded by |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
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1983
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|
2069 the current configuration. |
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Language and style fixes in development guide.
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parents:
1983
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|
2070 </listitem> |
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Language and style fixes in development guide.
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|
2071 |
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Language and style fixes in development guide.
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|
2072 <listitem> |
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Language and style fixes in development guide.
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1983
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|
2073 <literal>listening</literal> — Array of listening objects of type |
1899 | 2074 <literal>ngx_listening_t</literal>. |
1993
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Language and style fixes in development guide.
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1983
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|
2075 Listening objects are normally added by the <literal>listen</literal> |
1899 | 2076 directive of different modules which call the |
2077 <literal>ngx_create_listening()</literal> function. | |
1993
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Language and style fixes in development guide.
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1983
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|
2078 Listen sockets are created based on the listening objects. |
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Language and style fixes in development guide.
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|
2079 </listitem> |
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|
2080 |
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|
2081 <listitem> |
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Language and style fixes in development guide.
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1983
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|
2082 <literal>paths</literal> — Array of paths of type <literal>ngx_path_t</literal>. |
1899 | 2083 Paths are added by calling the function <literal>ngx_add_path()</literal> from |
2084 modules which are going to operate on certain directories. | |
2085 These directories are created by nginx after reading configuration, if missing. | |
2086 Moreover, two handlers can be added for each path: | |
2087 | |
2088 <list type="bullet"> | |
2089 | |
2090 <listitem> | |
1993
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1983
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|
2091 path loader — Executes only once in 60 seconds after starting or reloading |
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Language and style fixes in development guide.
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|
2092 nginx. |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
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1983
diff
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|
2093 Normally, the loader reads the directory and stores data in nginx shared |
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Language and style fixes in development guide.
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1983
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|
2094 memory. |
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Language and style fixes in development guide.
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1983
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|
2095 The handler is called from the dedicated nginx process “nginx cache loader”. |
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|
2096 </listitem> |
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Language and style fixes in development guide.
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|
2097 |
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|
2098 <listitem> |
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|
2099 path manager — Executes periodically. |
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|
2100 Normally, the manager removes old files from the directory and updates nginx |
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Language and style fixes in development guide.
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|
2101 memory to reflect the changes. |
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|
2102 The handler is called from the dedicated “nginx cache manager” process. |
1899 | 2103 </listitem> |
2104 | |
2105 </list> | |
2106 </listitem> | |
2107 | |
2108 <listitem> | |
1993
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|
2109 <literal>open_files</literal> — List of open file objects of type |
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|
2110 <literal>ngx_open_file_t</literal>, which are created by calling the function |
1899 | 2111 <literal>ngx_conf_open_file()</literal>. |
1993
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|
2112 Currently, nginx uses this kind of open files for logging. |
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|
2113 After reading the configuration, nginx opens all files in the |
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|
2114 <literal>open_files</literal> list and stores each file descriptor in the |
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|
2115 object's <literal>fd</literal> field. |
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|
2116 The files are opened in append mode and are created if missing. |
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|
2117 The files in the list are reopened by nginx workers upon receiving the |
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|
2118 reopen signal (most often <literal>USR1</literal>). |
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|
2119 In this case the descriptor in the <literal>fd</literal> field is changed to a |
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|
2120 new value. |
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|
2121 </listitem> |
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|
2122 |
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|
2123 <listitem> |
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|
2124 <literal>shared_memory</literal> — List of shared memory zones, each added by |
1899 | 2125 calling the <literal>ngx_shared_memory_add()</literal> function. |
2126 Shared zones are mapped to the same address range in all nginx processes and | |
1993
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|
2127 are used to share common data, for example the HTTP cache in-memory tree. |
1899 | 2128 </listitem> |
2129 | |
2130 </list> | |
2131 </para> | |
2132 | |
2133 </section> | |
2134 | |
2135 <section name="Buffer" id="buffer"> | |
2136 | |
2137 <para> | |
2138 For input/output operations, nginx provides the buffer type | |
2139 <literal>ngx_buf_t</literal>. | |
2140 Normally, it's used to hold data to be written to a destination or read from a | |
2141 source. | |
1993
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|
2142 A buffer can reference data in memory or in a file and it's technically |
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|
2143 possible for a buffer to reference both at the same time. |
1899 | 2144 Memory for the buffer is allocated separately and is not related to the buffer |
2145 structure <literal>ngx_buf_t</literal>. | |
2146 </para> | |
2147 | |
2148 <para> | |
1993
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|
2149 The <literal>ngx_buf_t</literal> structure has the following fields: |
1899 | 2150 </para> |
2151 | |
2152 <para> | |
2153 <list type="bullet"> | |
2154 | |
2155 <listitem> | |
1993
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|
2156 <literal>start</literal>, <literal>end</literal> — The boundaries of the memory |
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|
2157 block allocated for the buffer. |
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|
2158 </listitem> |
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|
2159 |
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|
2160 <listitem> |
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|
2161 <literal>pos</literal>, <literal>last</literal> — The boundaries of the memory |
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|
2162 buffer; normally a subrange of <literal>start</literal> .. |
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|
2163 <literal>end</literal>. |
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|
2164 </listitem> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2165 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2166 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2167 <literal>file_pos</literal>, <literal>file_last</literal> — The boundaries of a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2168 file buffer, expressed as offsets from the beginning of the file. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2169 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2170 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2171 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2172 <literal>tag</literal> — Unique value used to distinguish buffers; created by |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2173 different nginx modules, usually for the purpose of buffer reuse. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2174 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2175 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2176 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2177 <literal>file</literal> — File object. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2178 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2179 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2180 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2181 <literal>temporary</literal> — Flag indicating that the buffer references |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2182 writable memory. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2183 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2184 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2185 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2186 <literal>memory</literal> — Flag indicating that the buffer references read-only |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2187 memory. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2188 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2189 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2190 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2191 <literal>in_file</literal> — Flag indicating that the buffer references data |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2192 in a file. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2193 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2194 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2195 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2196 <literal>flush</literal> — Flag indicating that all data prior to the buffer |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2197 need to be flushed. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2198 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2199 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2200 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2201 <literal>recycled</literal> — Flag indicating that the buffer can be reused and |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2202 needs to be consumed as soon as possible. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2203 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2204 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2205 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2206 <literal>sync</literal> — Flag indicating that the buffer carries no data or |
1899 | 2207 special signal like <literal>flush</literal> or <literal>last_buf</literal>. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2208 By default nginx considers such buffers an error condition, but this flag tells |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2209 nginx to skip the error check. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2210 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2211 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2212 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2213 <literal>last_buf</literal> — Flag indicating that the buffer is the last in |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2214 output. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2215 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2216 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2217 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2218 <literal>last_in_chain</literal> — Flag indicating that there are no more data |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2219 buffers in a request or subrequest. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2220 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2221 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2222 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2223 <literal>shadow</literal> — Reference to another ("shadow") buffer related to |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2224 the current buffer, usually in the sense that the buffer uses data from the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2225 shadow. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2226 When the buffer is consumed, the shadow buffer is normally also marked as |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2227 consumed. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2228 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2229 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2230 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2231 <literal>last_shadow</literal> — Flag indicating that the buffer is the last |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2232 one that references a particular shadow buffer. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2233 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2234 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2235 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2236 <literal>temp_file</literal> — Flag indicating that the buffer is in a temporary |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2237 file. |
1899 | 2238 </listitem> |
2239 | |
2240 </list> | |
2241 </para> | |
2242 | |
2243 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2244 For input and output operations buffers are linked in chains. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2245 A chain is a sequence of chain links of type <literal>ngx_chain_t</literal>, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2246 defined as follows: |
1899 | 2247 </para> |
2248 | |
2249 | |
2250 <programlisting> | |
2251 typedef struct ngx_chain_s ngx_chain_t; | |
2252 | |
2253 struct ngx_chain_s { | |
2254 ngx_buf_t *buf; | |
2255 ngx_chain_t *next; | |
2256 }; | |
2257 </programlisting> | |
2258 | |
2259 <para> | |
2260 Each chain link keeps a reference to its buffer and a reference to the next | |
2261 chain link. | |
2262 </para> | |
2263 | |
2264 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2265 An example of using buffers and chains: |
1899 | 2266 </para> |
2267 | |
2268 | |
2269 <programlisting> | |
2270 ngx_chain_t * | |
2271 ngx_get_my_chain(ngx_pool_t *pool) | |
2272 { | |
2273 ngx_buf_t *b; | |
2274 ngx_chain_t *out, *cl, **ll; | |
2275 | |
2276 /* first buf */ | |
2277 cl = ngx_alloc_chain_link(pool); | |
2278 if (cl == NULL) { /* error */ } | |
2279 | |
2280 b = ngx_calloc_buf(pool); | |
2281 if (b == NULL) { /* error */ } | |
2282 | |
2283 b->start = (u_char *) "foo"; | |
2284 b->pos = b->start; | |
2285 b->end = b->start + 3; | |
2286 b->last = b->end; | |
2287 b->memory = 1; /* read-only memory */ | |
2288 | |
2289 cl->buf = b; | |
2290 out = cl; | |
2291 ll = &cl->next; | |
2292 | |
2293 /* second buf */ | |
2294 cl = ngx_alloc_chain_link(pool); | |
2295 if (cl == NULL) { /* error */ } | |
2296 | |
2297 b = ngx_create_temp_buf(pool, 3); | |
2298 if (b == NULL) { /* error */ } | |
2299 | |
2300 b->last = ngx_cpymem(b->last, "foo", 3); | |
2301 | |
2302 cl->buf = b; | |
2303 cl->next = NULL; | |
2304 *ll = cl; | |
2305 | |
2306 return out; | |
2307 } | |
2308 </programlisting> | |
2309 | |
2310 </section> | |
2311 | |
2312 | |
2313 <section name="Networking" id="networking"> | |
2314 | |
2315 | |
2316 <!-- | |
2317 <section name="Network data types" id="network_data_types"> | |
2318 | |
2319 <para> | |
2320 TBD: ngx_addr_t, ngx_url_t, ngx_socket_t, ngx_sockaddr_t, parse url, parse | |
2321 address... | |
2322 </para> | |
2323 | |
2324 </section> | |
2325 --> | |
2326 | |
2327 <section name="Connection" id="connection"> | |
2328 | |
2329 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2330 The connection type <literal>ngx_connection_t</literal> is a wrapper around a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2331 socket descriptor. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2332 It includes the following fields: |
1899 | 2333 </para> |
2334 | |
2335 <para> | |
2336 <list type="bullet"> | |
2337 | |
2338 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2339 <literal>fd</literal> — Socket descriptor |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2340 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2341 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2342 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2343 <literal>data</literal> — Arbitrary connection context. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2344 Normally, it is a pointer to a higher-level object built on top of the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2345 connection, such as an HTTP request or a Stream session. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2346 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2347 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2348 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2349 <literal>read</literal>, <literal>write</literal> — Read and write events for |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2350 the connection. |
1899 | 2351 </listitem> |
2352 | |
2353 <listitem> | |
2354 <literal>recv</literal>, <literal>send</literal>, | |
1935
be7490a66d1b
Style: use long dash with non-breaking space where appropriate.
Vladimir Homutov <vl@nginx.com>
parents:
1932
diff
changeset
|
2355 <literal>recv_chain</literal>, <literal>send_chain</literal> — I/O operations |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2356 for the connection. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2357 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2358 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2359 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2360 <literal>pool</literal> — Connection pool. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2361 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2362 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2363 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2364 <literal>log</literal> — Connection log. |
1899 | 2365 </listitem> |
2366 | |
2367 <listitem> | |
2368 <literal>sockaddr</literal>, <literal>socklen</literal>, | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2369 <literal>addr_text</literal> — Remote socket address in binary and text forms. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2370 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2371 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2372 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2373 <literal>local_sockaddr</literal>, <literal>local_socklen</literal> — Local |
1899 | 2374 socket address in binary form. |
2375 Initially, these fields are empty. | |
1993
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2376 Use the <literal>ngx_connection_local_sockaddr()</literal> function to get the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2377 local socket address. |
1899 | 2378 </listitem> |
2379 | |
2380 <listitem> | |
2381 <literal>proxy_protocol_addr</literal>, <literal>proxy_protocol_port</literal> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2382 - PROXY protocol client address and port, if the PROXY protocol is enabled for |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2383 the connection. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2384 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2385 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2386 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2387 <literal>ssl</literal> — SSL context for the connection. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2388 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2389 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2390 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2391 <literal>reusable</literal> — Flag indicating the connection is in a state that |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2392 makes it eligible for reuse. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2393 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2394 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2395 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2396 <literal>close</literal> — Flag indicating that the connection is being reused |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2397 and needs to be closed. |
1899 | 2398 </listitem> |
2399 | |
2400 </list> | |
2401 </para> | |
2402 | |
2403 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2404 An nginx connection can transparently encapsulate the SSL layer. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2405 In this case the connection's <literal>ssl</literal> field holds a pointer to an |
1899 | 2406 <literal>ngx_ssl_connection_t</literal> structure, keeping all SSL-related data |
2407 for the connection, including <literal>SSL_CTX</literal> and | |
2408 <literal>SSL</literal>. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2409 The <literal>recv</literal>, <literal>send</literal>, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2410 <literal>recv_chain</literal>, and <literal>send_chain</literal> handlers are |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2411 set to SSL-enabled functions as well. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2412 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2413 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2414 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2415 The <literal>worker_connections</literal> directive in the nginx configuration |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2416 limits the number of connections per nginx worker. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2417 All connection structures are precreated when a worker starts and stored in |
1899 | 2418 the <literal>connections</literal> field of the cycle object. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2419 To retrieve a connection structure, use the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2420 <literal>ngx_get_connection(s, log)</literal> function. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2421 It takes as its <literal>s</literal> argument a socket descriptor, which needs |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2422 to be wrapped in a connection structure. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2423 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2424 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2425 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2426 Because the number of connections per worker is limited, nginx provides a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2427 way to grab connections that are currently in use. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2428 To enable or disable reuse of a connection, call the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2429 <literal>ngx_reusable_connection(c, reusable)</literal> function. |
1899 | 2430 Calling <literal>ngx_reusable_connection(c, 1)</literal> sets the |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2431 <literal>reuse</literal> flag in the connection structure and inserts the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2432 connection into the <literal>reusable_connections_queue</literal> of the cycle. |
1899 | 2433 Whenever <literal>ngx_get_connection()</literal> finds out there are no |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2434 available connections in the cycle's <literal>free_connections</literal> list, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2435 it calls <literal>ngx_drain_connections()</literal> to release a |
1899 | 2436 specific number of reusable connections. |
2437 For each such connection, the <literal>close</literal> flag is set and its read | |
2438 handler is called which is supposed to free the connection by calling | |
2439 <literal>ngx_close_connection(c)</literal> and make it available for reuse. | |
2440 To exit the state when a connection can be reused | |
2441 <literal>ngx_reusable_connection(c, 0)</literal> is called. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2442 HTTP client connections are an example of reusable connections in nginx; they |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2443 are marked as reusable until the first request byte is received from the client. |
1899 | 2444 </para> |
2445 | |
2446 </section> | |
2447 | |
2448 | |
2449 </section> | |
2450 | |
2451 | |
2452 <section name="Events" id="events"> | |
2453 | |
2454 | |
2455 <section name="Event" id="event"> | |
2456 | |
2457 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2458 Event object <literal>ngx_event_t</literal> in nginx provides a mechanism |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2459 for notification that a specific event has occurred. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2460 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2461 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2462 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2463 Fields in <literal>ngx_event_t</literal> include: |
1899 | 2464 </para> |
2465 | |
2466 <para> | |
2467 <list type="bullet"> | |
2468 | |
2469 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2470 <literal>data</literal> — Arbitrary event context used in event handlers, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2471 usually as pointer to a connection related to the event. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2472 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2473 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2474 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2475 <literal>handler</literal> — Callback function to be invoked when the event |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2476 happens. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2477 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2478 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2479 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2480 <literal>write</literal> — Flag indicating a write event. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2481 Absence of the flag indicates a read event. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2482 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2483 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2484 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2485 <literal>active</literal> — Flag indicating that the event is registered for |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2486 receiving I/O notifications, normally from notification mechanisms like |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2487 <literal>epoll</literal>, <literal>kqueue</literal>, <literal>poll</literal>. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2488 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2489 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2490 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2491 <literal>ready</literal> — Flag indicating that the event has received an |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2492 I/O notification. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2493 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2494 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2495 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2496 <literal>delayed</literal> — Flag indicating that I/O is delayed due to rate |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2497 limiting. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2498 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2499 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2500 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2501 <literal>timer</literal> — Red-black tree node for inserting the event into |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2502 the timer tree. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2503 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2504 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2505 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2506 <literal>timer_set</literal> — Flag indicating that the event timer is set and |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2507 not yet expired. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2508 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2509 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2510 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2511 <literal>timedout</literal> — Flag indicating that the event timer has expired. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2512 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2513 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2514 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2515 <literal>eof</literal> — Flag indicating that EOF occurred while reading data. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2516 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2517 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2518 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2519 <literal>pending_eof</literal> — Flag indicating that EOF is pending on the |
1899 | 2520 socket, even though there may be some data available before it. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2521 The flag is delivered via the <literal>EPOLLRDHUP</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2522 <literal>epoll</literal> event or |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2523 <literal>EV_EOF</literal> <literal>kqueue</literal> flag. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2524 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2525 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2526 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2527 <literal>error</literal> — Flag indicating that an error occurred during |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2528 reading (for a read event) or writing (for a write event). |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2529 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2530 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2531 <listitem> |
1995
80f53da7280c
Updated cancelable event description in the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1994
diff
changeset
|
2532 <literal>cancelable</literal> — Timer event flag indicating that the event |
80f53da7280c
Updated cancelable event description in the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1994
diff
changeset
|
2533 should be ignored while shutting down the worker. |
80f53da7280c
Updated cancelable event description in the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1994
diff
changeset
|
2534 Graceful worker shutdown is delayed until there are no non-cancelable timer |
80f53da7280c
Updated cancelable event description in the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1994
diff
changeset
|
2535 events scheduled. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2536 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2537 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2538 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2539 <literal>posted</literal> — Flag indicating that the event is posted to a queue. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2540 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2541 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2542 <listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2543 <literal>queue</literal> — Queue node for posting the event to a queue. |
1899 | 2544 </listitem> |
2545 | |
2546 </list> | |
2547 </para> | |
2548 | |
2549 </section> | |
2550 | |
2551 | |
2552 <section name="I/O events" id="i_o_events"> | |
2553 | |
2554 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2555 Each connection obtained by calling the <literal>ngx_get_connection()</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2556 function has two attached events, <literal>c->read</literal> and |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2557 <literal>c->write</literal>, which are used for receiving notification that the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2558 socket is ready for reading or writing. |
1899 | 2559 All such events operate in Edge-Triggered mode, meaning that they only trigger |
2560 notifications when the state of the socket changes. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2561 For example, doing a partial read on a socket does not make nginx deliver a |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2562 repeated read notification until more data arrives on the socket. |
1899 | 2563 Even when the underlying I/O notification mechanism is essentially |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2564 Level-Triggered (<literal>poll</literal>, <literal>select</literal> etc), nginx |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2565 converts the notifications to Edge-Triggered. |
1899 | 2566 To make nginx event notifications consistent across all notifications systems |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2567 on different platforms, the functions |
1899 | 2568 <literal>ngx_handle_read_event(rev, flags)</literal> and |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2569 <literal>ngx_handle_write_event(wev, lowat)</literal> must be called after |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2570 handling an I/O socket notification or calling any I/O functions on that socket. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2571 Normally, the functions are called once at the end of each read or write |
1899 | 2572 event handler. |
2573 </para> | |
2574 | |
2575 </section> | |
2576 | |
2577 | |
2578 <section name="Timer events" id="timer_events"> | |
2579 | |
2580 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2581 An event can be set to send a notification when a timeout expires. |
1899 | 2582 The function <literal>ngx_add_timer(ev, timer)</literal> sets a timeout for an |
2583 event, <literal>ngx_del_timer(ev)</literal> deletes a previously set timeout. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2584 The global timeout red-black tree <literal>ngx_event_timer_rbtree</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2585 stores all timeouts currently set. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2586 The key in the tree is of type <literal>ngx_msec_t</literal> and is the time |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2587 when the event expires, expressed in milliseconds since the midnight on of |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2588 January 1, 1970 modulus <literal>ngx_msec_t</literal> max value. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2589 The tree structure enables fast insertion and deletion operations, as well as |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2590 access to the nearest timeouts, which nginx uses to find out how long to wait |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2591 for I/O events and for expiring timeout events. |
1899 | 2592 </para> |
2593 | |
2594 </section> | |
2595 | |
2596 | |
2597 <section name="Posted events" id="posted_events"> | |
2598 | |
2599 <para> | |
2600 An event can be posted which means that its handler will be called at some | |
2601 point later within the current event loop iteration. | |
2602 Posting events is a good practice for simplifying code and escaping stack | |
2603 overflows. | |
2604 Posted events are held in a post queue. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2605 The <literal>ngx_post_event(ev, q)</literal> mscro posts the event |
1899 | 2606 <literal>ev</literal> to the post queue <literal>q</literal>. |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2607 The <literal>ngx_delete_posted_event(ev)</literal> macro deletes the event |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2608 <literal>ev</literal> from the queue it's currently posted in. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2609 Normally, events are posted to the <literal>ngx_posted_events</literal> queue, |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2610 which is processed late in the event loop — after all I/O and timer |
1899 | 2611 events are already handled. |
2612 The function <literal>ngx_event_process_posted()</literal> is called to process | |
2613 an event queue. | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2614 It calls event handlers until the queue is not empty. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2615 This means that a posted event handler can post more events to be processed |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2616 within the current event loop iteration. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2617 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2618 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2619 <para> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2620 An example: |
1899 | 2621 </para> |
2622 | |
2623 | |
2624 <programlisting> | |
2625 void | |
2626 ngx_my_connection_read(ngx_connection_t *c) | |
2627 { | |
2628 ngx_event_t *rev; | |
2629 | |
2630 rev = c->read; | |
2631 | |
2632 ngx_add_timer(rev, 1000); | |
2633 | |
2634 rev->handler = ngx_my_read_handler; | |
2635 | |
2636 ngx_my_read(rev); | |
2637 } | |
2638 | |
2639 | |
2640 void | |
2641 ngx_my_read_handler(ngx_event_t *rev) | |
2642 { | |
2643 ssize_t n; | |
2644 ngx_connection_t *c; | |
2645 u_char buf[256]; | |
2646 | |
2647 if (rev->timedout) { /* timeout expired */ } | |
2648 | |
2649 c = rev->data; | |
2650 | |
2651 while (rev->ready) { | |
2652 n = c->recv(c, buf, sizeof(buf)); | |
2653 | |
2654 if (n == NGX_AGAIN) { | |
2655 break; | |
2656 } | |
2657 | |
2658 if (n == NGX_ERROR) { /* error */ } | |
2659 | |
2660 /* process buf */ | |
2661 } | |
2662 | |
2663 if (ngx_handle_read_event(rev, 0) != NGX_OK) { /* error */ } | |
2664 } | |
2665 </programlisting> | |
2666 | |
2667 </section> | |
2668 | |
2669 | |
2670 <section name="Event loop" id="event_loop"> | |
2671 | |
2672 <para> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2673 Except for the nginx master process, all nginx processes do I/O and so have an |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2674 event loop. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2675 (The nginx master process instead spends most of its time in the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2676 <literal>sigsuspend()</literal> call waiting for signals to arrive.) |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2677 The nginx event loop is implemented in the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2678 <literal>ngx_process_events_and_timers()</literal> function, which is called |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2679 repeatedly until the process exits. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2680 </para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2681 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2682 <para> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2683 The event loop has the following stages: |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2684 |
1899 | 2685 <list type="bullet"> |
2686 | |
2687 <listitem> | |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2688 Find the timeout that is closest to expiring, by calling |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2689 <literal>ngx_event_find_timer()</literal>. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2690 This function finds the leftmost node in the timer tree and returns the |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2691 number of milliseconds until the node expires. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2692 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2693 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2694 <listitem> |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2695 Process I/O events by calling a handler, specific to the event notification |
1899 | 2696 mechanism, chosen by nginx configuration. |
1993
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2697 This handler waits for at least one I/O event to happen, but only until the next |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2698 timeout expires. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2699 When a read or write event occurs, the <literal>ready</literal> |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2700 flag is set and the event's handler is called. |
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Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2701 For Linux, the <literal>ngx_epoll_process_events()</literal> handler |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
2702 is normally used, which calls <literal>epoll_wait()</literal> to wait for I/O |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
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|
2703 events. |
98b713b0a9fa
Language and style fixes in development guide.
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parents:
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diff
changeset
|
2704 </listitem> |
98b713b0a9fa
Language and style fixes in development guide.
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diff
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|
2705 |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
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diff
changeset
|
2706 <listitem> |
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Language and style fixes in development guide.
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parents:
1983
diff
changeset
|
2707 Expire timers by calling <literal>ngx_event_expire_timers()</literal>. |
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parents:
1983
diff
changeset
|
2708 The timer tree is iterated from the leftmost element to the right until an |
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parents:
1983
diff
changeset
|
2709 unexpired timeout is found. |
1899 | 2710 For each expired node the <literal>timedout</literal> event flag is set, |
1993
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|
2711 the <literal>timer_set</literal> flag is reset, and the event handler is called |
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|
2712 </listitem> |
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|
2713 |
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|
2714 <listitem> |
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|
2715 Process posted events by calling <literal>ngx_event_process_posted()</literal>. |
1899 | 2716 The function repeatedly removes the first element from the posted events |
1993
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diff
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|
2717 queue and calls the element's handler, until the queue is empty. |
1899 | 2718 </listitem> |
2719 | |
2720 </list> | |
2721 </para> | |
2722 | |
2723 <para> | |
2724 All nginx processes handle signals as well. | |
2725 Signal handlers only set global variables which are checked after the | |
2726 <literal>ngx_process_events_and_timers()</literal> call. | |
2727 </para> | |
2728 | |
2729 </section> | |
2730 | |
2731 | |
2732 </section> | |
2733 | |
2734 | |
2735 <section name="Processes" id="processes"> | |
2736 | |
2737 <para> | |
2738 There are several types of processes in nginx. | |
2007
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diff
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|
2739 The type of a process is kept in the <literal>ngx_process</literal> |
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parents:
1999
diff
changeset
|
2740 global variable, and is one of the following: |
1899 | 2741 </para> |
2742 | |
2743 <list type="bullet"> | |
2744 | |
2745 <listitem> | |
2746 | |
2747 <para> | |
2007
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parents:
1999
diff
changeset
|
2748 <literal>NGX_PROCESS_MASTER</literal> — The master process, which reads the |
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parents:
1999
diff
changeset
|
2749 NGINX configuration, creates cycles, and starts and controls child processes. |
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1999
diff
changeset
|
2750 It does not perform any I/O and responds only to signals. |
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1999
diff
changeset
|
2751 Its cycle function is <literal>ngx_master_process_cycle()</literal>. |
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diff
changeset
|
2752 </para> |
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diff
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|
2753 |
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diff
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|
2754 |
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diff
changeset
|
2755 </listitem> |
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|
2756 |
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diff
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|
2757 <listitem> |
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diff
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|
2758 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2759 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2760 <literal>NGX_PROCESS_WORKER</literal> — The worker process, which handles client |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2761 connections. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2762 It is started by the master process and responds to its signals and channel |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2763 commands as well. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2764 Its cycle function is <literal>ngx_worker_process_cycle()</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2765 There can be multiple worker processes, as configured by the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2766 <literal>worker_processes</literal> directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2767 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2768 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2769 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2770 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2771 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2772 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2773 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2774 <literal>NGX_PROCESS_SINGLE</literal> — The single process, which exists only in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2775 <literal>master_process off</literal> mode, and is the only process running in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2776 that mode. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2777 It creates cycles (like the master process does) and handles client connections |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2778 (like the worker process does). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2779 Its cycle function is <literal>ngx_single_process_cycle()</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2780 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2781 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2782 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2783 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2784 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2785 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2786 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2787 <literal>NGX_PROCESS_HELPER</literal> — The helper process, of which currently |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2788 there are two types: cache manager and cache loader. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2789 The cycle function for both is |
1899 | 2790 <literal>ngx_cache_manager_process_cycle()</literal>. |
2791 </para> | |
2792 | |
2793 </listitem> | |
2794 | |
2795 </list> | |
2796 | |
2797 <para> | |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2798 The nginx processes handle the following signals: |
1899 | 2799 </para> |
2800 | |
2801 <list type="bullet"> | |
2802 | |
2803 <listitem> | |
2804 | |
2805 <para> | |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2806 <literal>NGX_SHUTDOWN_SIGNAL</literal> (<literal>SIGQUIT</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2807 systems) — Gracefully shutdown. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2808 Upon receiving this signal, the master process sends a shutdown signal to all |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2809 child processes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2810 When no child processes are left, the master destroys the cycle pool and exits. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2811 When a worker process receives this signal, it closes all listening sockets and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2812 waits until there are no non-cancelable events scheduled, then destroys the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2813 cycle pool and exits. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2814 When the cache manager or the cache loader process receives this signal, it |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2815 exits immediately. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2816 The <literal>ngx_quit</literal> variable is set to <literal>1</literal> when a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2817 process receives this signal, and is immediately reset after being processed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2818 The <literal>ngx_exiting</literal> variable is set to <literal>1</literal> while |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2819 a worker process is in the shutdown state. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2820 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2821 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2822 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2823 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2824 <listitem> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2825 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2826 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2827 <literal>NGX_TERMINATE_SIGNAL</literal> (<literal>SIGTERM</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2828 systems) — Terminate. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2829 Upon receiving this signal, the master process sends a terminate signal to all |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2830 child processes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2831 If a child process does not exit within 1 second, the master process sends the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2832 <literal>SIGKILL</literal> signal to kill it. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2833 When no child processes are left, the master process destroys the cycle pool and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2834 exits. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2835 When a worker process, the cache manager process or the cache loader process |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2836 receives this signal, it destroys the cycle pool and exits. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2837 The variable <literal>ngx_terminate</literal> is set to <literal>1</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2838 when this signal is received. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2839 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2840 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2841 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2842 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2843 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2844 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2845 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2846 <literal>NGX_NOACCEPT_SIGNAL</literal> (<literal>SIGWINCH</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2847 systems) - Shut down all worker and helper processes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2848 Upon receiving this signal, the master process shuts down its child processes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2849 If a previously started new nginx binary exits, the child processes of the old |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2850 master are started again. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2851 When a worker process receives this signal, it shuts down in debug mode |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2852 set by the <literal>debug_points</literal> directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2853 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2854 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2855 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2856 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2857 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2858 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2859 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2860 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2861 <literal>NGX_RECONFIGURE_SIGNAL</literal> (<literal>SIGHUP</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2862 systems) - Reconfigure. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2863 Upon receiving this signal, the master process re-reads the configuration and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2864 creates a new cycle based on it. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2865 If the new cycle is created successfully, the old cycle is deleted and new |
1899 | 2866 child processes are started. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2867 Meanwhile, the old child processes receive the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2868 <literal>NGX_SHUTDOWN_SIGNAL</literal> signal. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2869 In single-process mode, nginx creates a new cycle, but keeps the old one until |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2870 there are no longer clients with active connections tied to it. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2871 The worker and helper processes ignore this signal. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2872 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2873 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2874 </listitem> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2875 |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2876 <listitem> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2877 |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2878 <para> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2879 <literal>NGX_REOPEN_SIGNAL</literal> (<literal>SIGUSR1</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2880 systems) — Reopen files. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2881 The master process sends this signal to workers, which reopen all |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2882 <literal>open_files</literal> related to the cycle. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2883 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2884 |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2885 </listitem> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2886 |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2887 <listitem> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2888 |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2889 <para> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2890 <literal>NGX_CHANGEBIN_SIGNAL</literal> (<literal>SIGUSR2</literal> on most |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2891 systems) — Change the nginx binary. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2892 The master process starts a new nginx binary and passes in a list of all listen |
1899 | 2893 sockets. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2894 The text-format list, passed in the <literal>“NGINX”</literal> environment |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
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|
2895 variable, consists of descriptor numbers separated with semicolons. |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2896 The new nginx binary reads the <literal>“NGINX”</literal> variable and adds the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2897 sockets to its init cycle. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2898 Other processes ignore this signal. |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2899 </para> |
1899 | 2900 |
2901 </listitem> | |
2902 | |
2903 </list> | |
2904 | |
2905 <para> | |
2906 While all nginx worker processes are able to receive and properly handle POSIX | |
2007
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2907 signals, the master process does not use the standard <literal>kill()</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2908 syscall to pass signals to workers and helpers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2909 Instead, nginx uses inter-process socket pairs which allow sending messages |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2910 between all nginx processes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2911 Currently, however, messages are only sent from the master to its children. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2912 The messages carry the standard signals. |
1899 | 2913 </para> |
2914 | |
2915 </section> | |
2916 | |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2917 <section name="Threads" id="threads"> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2918 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2919 <para> |
2007
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2920 It is possible to offload into a separate thread tasks that would otherwise |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2921 block the nginx worker process. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2922 For example, nginx can be configured to use threads to perform |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2923 <link doc="../http/ngx_http_core_module.xml" id="aio">file I/O</link>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2924 Another use case is a library that doesn't have asynchronous interface |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2925 and thus cannot be normally used with nginx. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2926 Keep in mind that the threads interface is a helper for the existing |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2927 asynchronous approach to processing client connections, and by no means |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2928 intended as a replacement. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2929 </para> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2930 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2931 <para> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2932 To deal with synchronization, the following wrappers over |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2933 <literal>pthreads</literal> primitives are available: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2934 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2935 <list type="bullet"> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2936 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2937 <listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2938 <literal>typedef pthread_mutex_t ngx_thread_mutex_t;</literal> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2939 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2940 <list type="bullet"> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2941 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2942 <listitem> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2943 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2944 ngx_thread_mutex_create(ngx_thread_mutex_t *mtx, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2945 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2946 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2947 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2948 <literal>ngx_int_t |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2949 ngx_thread_mutex_destroy(ngx_thread_mutex_t *mtx, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2950 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2951 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2952 <listitem> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2953 <literal>ngx_int_t |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2954 ngx_thread_mutex_lock(ngx_thread_mutex_t *mtx, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2955 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2956 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2957 <listitem> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2958 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2959 ngx_thread_mutex_unlock(ngx_thread_mutex_t *mtx, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2960 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2961 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2962 </list> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2963 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2964 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2965 |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2966 <listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2967 <literal>typedef pthread_cond_t ngx_thread_cond_t;</literal> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2968 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2969 <list type="bullet"> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2970 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2971 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2972 <literal>ngx_int_t |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2973 ngx_thread_cond_create(ngx_thread_cond_t *cond, ngx_log_t *log);</literal> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2974 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2975 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2976 <listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2977 <literal>ngx_int_t |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2978 ngx_thread_cond_destroy(ngx_thread_cond_t *cond, ngx_log_t *log);</literal> |
c559be34257b
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2979 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2980 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2981 <listitem> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2982 <literal>ngx_int_t |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2983 ngx_thread_cond_signal(ngx_thread_cond_t *cond, ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2984 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2985 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2986 <listitem> |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2987 <literal>ngx_int_t |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2988 ngx_thread_cond_wait(ngx_thread_cond_t *cond, ngx_thread_mutex_t *mtx, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2989 ngx_log_t *log);</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2990 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2991 |
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2992 </list> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2993 |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2994 </listitem> |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2995 |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
2996 </list> |
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parents:
1999
diff
changeset
|
2997 |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2998 </para> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
2999 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3000 <para> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3001 Instead of creating a new thread for each task, nginx implements |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3002 a <link doc="../ngx_core_module.xml" id="thread_pool"/> strategy. |
2007
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3003 Multiple thread pools may be configured for different purposes |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3004 (for example, performing I/O on different sets of disks). |
2007
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parents:
1999
diff
changeset
|
3005 Each thread pool is created at startup and contains a limited number of threads |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3006 that process a queue of tasks. |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3007 When a task is completed, a predefined completion handler is called. |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3008 </para> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3009 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3010 <para> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3011 The <literal>src/core/ngx_thread_pool.h</literal> header file contains |
2007
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3012 relevant definitions: |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3013 <programlisting> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3014 struct ngx_thread_task_s { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3015 ngx_thread_task_t *next; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3016 ngx_uint_t id; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3017 void *ctx; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3018 void (*handler)(void *data, ngx_log_t *log); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3019 ngx_event_t event; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3020 }; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3021 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3022 typedef struct ngx_thread_pool_s ngx_thread_pool_t; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3023 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3024 ngx_thread_pool_t *ngx_thread_pool_add(ngx_conf_t *cf, ngx_str_t *name); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3025 ngx_thread_pool_t *ngx_thread_pool_get(ngx_cycle_t *cycle, ngx_str_t *name); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3026 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3027 ngx_thread_task_t *ngx_thread_task_alloc(ngx_pool_t *pool, size_t size); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3028 ngx_int_t ngx_thread_task_post(ngx_thread_pool_t *tp, ngx_thread_task_t *task); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3029 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3030 </programlisting> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3031 At configuration time, a module willing to use threads has to obtain a |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3032 reference to a thread pool by calling |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3033 <literal>ngx_thread_pool_add(cf, name)</literal>, which either creates a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3034 new thread pool with the given <literal>name</literal> or returns a reference |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3035 to the pool with that name if it already exists. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3036 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3037 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3038 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3039 To add a <literal>task</literal> into a queue of a specified thread pool |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3040 <literal>tp</literal> at runtime, use the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3041 <literal>ngx_thread_task_post(tp, task)</literal> function. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3042 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3043 To execute a function in a thread, pass parameters and setup a completion |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3044 handler using the <literal>ngx_thread_task_t</literal> structure: |
1983
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3045 <programlisting> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3046 typedef struct { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3047 int foo; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3048 } my_thread_ctx_t; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3049 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3050 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3051 static void |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3052 my_thread_func(void *data, ngx_log_t *log) |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3053 { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3054 my_thread_ctx_t *ctx = data; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3055 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3056 /* this function is executed in a separate thread */ |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3057 } |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3058 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3059 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3060 static void |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3061 my_thread_completion(ngx_event_t *ev) |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3062 { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3063 my_thread_ctx_t *ctx = ev->data; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3064 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3065 /* executed in nginx event loop */ |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3066 } |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3067 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3068 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3069 ngx_int_t |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3070 my_task_offload(my_conf_t *conf) |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3071 { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3072 my_thread_ctx_t *ctx; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3073 ngx_thread_task_t *task; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3074 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3075 task = ngx_thread_task_alloc(conf->pool, sizeof(my_thread_ctx_t)); |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3076 if (task == NULL) { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3077 return NGX_ERROR; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3078 } |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3079 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3080 ctx = task->ctx; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3081 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3082 ctx->foo = 42; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3083 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3084 task->handler = my_thread_func; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3085 task->event.handler = my_thread_completion; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3086 task->event.data = ctx; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3087 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3088 if (ngx_thread_task_post(conf->thread_pool, task) != NGX_OK) { |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3089 return NGX_ERROR; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3090 } |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3091 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3092 return NGX_OK; |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3093 } |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3094 </programlisting> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3095 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3096 </para> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3097 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3098 </section> |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3099 |
7660d6390a9d
Added the "Threads" section into the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1982
diff
changeset
|
3100 |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3101 <section name="Modules" id="Modules"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3102 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3103 <section name="Adding new modules" id="adding_new_modules"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3104 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3105 Each standalone nginx module resides in a separate directory that contains |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3106 at least two files: |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3107 <literal>config</literal> and a file with the module source code. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3108 The <literal>config</literal> file contains all information needed for nginx to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3109 integrate the module, for example: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3110 <programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3111 ngx_module_type=CORE |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3112 ngx_module_name=ngx_foo_module |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3113 ngx_module_srcs="$ngx_addon_dir/ngx_foo_module.c" |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3114 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3115 . auto/module |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3116 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3117 ngx_addon_name=$ngx_module_name |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3118 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3119 The <literal>config</literal> file is a POSIX shell script that can set |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3120 and access the following variables: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3121 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3122 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3123 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3124 <literal>ngx_module_type</literal> — Type of module to build. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3125 Possible values are <literal>CORE</literal>, <literal>HTTP</literal>, |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3126 <literal>HTTP_FILTER</literal>, <literal>HTTP_INIT_FILTER</literal>, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3127 <literal>HTTP_AUX_FILTER</literal>, <literal>MAIL</literal>, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3128 <literal>STREAM</literal>, or <literal>MISC</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3129 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3130 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3131 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3132 <literal>ngx_module_name</literal> — Module names. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3133 To build multiple modules from a set of source files, specify a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3134 whitespace-separated list of names. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3135 The first name indicates the name of the output binary for the dynamic module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3136 The names in the list must match the names used in the source code. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3137 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3138 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3139 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3140 <literal>ngx_addon_name</literal> — Name of the module as it appears in output |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3141 on the console from the configure script. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3142 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3143 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3144 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3145 <literal>ngx_module_srcs</literal> — Whitespace-separated list of source |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3146 files used to compile the module. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3147 The <literal>$ngx_addon_dir</literal> variable can be used to represent the path |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3148 to the module directory. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3149 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3150 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3151 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3152 <literal>ngx_module_incs</literal> — Include paths required to build the module |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3153 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3154 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3155 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3156 <literal>ngx_module_deps</literal> — Whitespace-separated list of the module's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3157 dependencies. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3158 Usually, it is the list of header files. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3159 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3160 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3161 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3162 <literal>ngx_module_libs</literal> — Whitespace-separated list of libraries to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3163 link with the module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3164 For example, use <literal>ngx_module_libs=-lpthread</literal> to link |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3165 <literal>libpthread</literal> library. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3166 The following macros can be used to link against the same libraries as |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3167 nginx: |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3168 <literal>LIBXSLT</literal>, <literal>LIBGD</literal>, <literal>GEOIP</literal>, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3169 <literal>PCRE</literal>, <literal>OPENSSL</literal>, <literal>MD5</literal>, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3170 <literal>SHA1</literal>, <literal>ZLIB</literal>, and <literal>PERL</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3171 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3172 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3173 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3174 <literal>ngx_module_link</literal> — Variable set by the build system to |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3175 <literal>DYNAMIC</literal> for a dynamic module or <literal>ADDON</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3176 for a static module and used to determine different actions to perform |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3177 depending on linking type. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3178 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3179 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3180 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3181 <literal>ngx_module_order</literal> — Load order for the module; |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3182 useful for the <literal>HTTP_FILTER</literal> and |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3183 <literal>HTTP_AUX_FILTER</literal> module types. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3184 The format for this option is a whitespace-separated list of modules. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3185 All modules in the list following the current module's name end up after it in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3186 the global list of modules, which sets up the order for modules initialization. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3187 For filter modules later initialization means earlier execution. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3188 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3189 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3190 The following modules are typically used as references. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3191 The <literal>ngx_http_copy_filter_module</literal> reads the data for other |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3192 filter modules and is placed near the bottom of the list so that it is one of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3193 the first to be executed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3194 The <literal>ngx_http_write_filter_module</literal> writes the data to the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3195 client socket and is placed near the top of the list, and is the last to be |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3196 executed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3197 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3198 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3199 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3200 By default, filter modules are placed before the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3201 <literal>ngx_http_copy_filter</literal> in the module list so that the filter |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3202 handler is executed after the copy filter handler. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3203 For other module types the default is the empty string. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3204 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3205 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3206 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3207 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3208 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3209 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3210 To compile a module into nginx statically, use the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3211 <literal>--add-module=/path/to/module</literal> argument to the configure |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3212 script. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3213 To compile a module for later dynamic loading into nginx, use the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3214 <literal>--add-dynamic-module=/path/to/module</literal> argument. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3215 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3216 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3217 </section> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3218 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3219 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3220 <section name="Core Modules" id="core_modules"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3221 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3222 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3223 Modules are the building blocks of nginx, and most of its functionality is |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3224 implemented as modules. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3225 The module source file must contain a global variable of type |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3226 <literal>ngx_module_t</literal>, which is defined as follows: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3227 <programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3228 struct ngx_module_s { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3229 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3230 /* private part is omitted */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3231 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3232 void *ctx; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3233 ngx_command_t *commands; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3234 ngx_uint_t type; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3235 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3236 ngx_int_t (*init_master)(ngx_log_t *log); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3237 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3238 ngx_int_t (*init_module)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3239 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3240 ngx_int_t (*init_process)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3241 ngx_int_t (*init_thread)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3242 void (*exit_thread)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3243 void (*exit_process)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3244 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3245 void (*exit_master)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3246 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3247 /* stubs for future extensions are omitted */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3248 }; |
2c14a16c61eb
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Vladimir Homutov <vl@nginx.com>
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1920
diff
changeset
|
3249 </programlisting> |
2007
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1999
diff
changeset
|
3250 The omitted private part includes the module version and a signature and is |
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3251 filled using the predefined macro <literal>NGX_MODULE_V1</literal>. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3252 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3253 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3254 <para> |
2c14a16c61eb
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Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3255 Each module keeps its private data in the <literal>ctx</literal> field, |
2007
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DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3256 recognizes the configuration directives, specified in the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3257 <literal>commands</literal> array, and can be invoked at certain stages of |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3258 nginx lifecycle. |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3259 The module lifecycle consists of the following events: |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3260 |
2c14a16c61eb
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Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3261 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3262 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3263 <listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3264 Configuration directive handlers are called as they appear |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3265 in configuration files in the context of the master process. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3266 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3267 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3268 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3269 After the configuration is parsed successfully, <literal>init_module</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3270 handler is called in the context of the master process. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3271 The <literal>init_module</literal> handler is called in the master process each |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3272 time a configuration is loaded. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3273 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3274 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3275 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3276 The master process creates one or more worker processes and the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3277 <literal>init_process</literal> handler is called in each of them. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3278 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3279 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3280 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3281 When a worker process receives the shutdown or terminate command from the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3282 master, it invokes the <literal>exit_process</literal> handler. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3283 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3284 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3285 <listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3286 The master process calls the <literal>exit_master</literal> handler before |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3287 exiting. |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3288 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3289 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3290 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3291 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3292 Because threads are used in nginx only as a supplementary I/O facility with its |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3293 own API, <literal>init_thread</literal> and <literal>exit_thread</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3294 handlers are not currently called. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3295 There is also no <literal>init_master</literal> handler, because it would be |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3296 unnecessary overhead. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3297 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3298 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3299 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3300 The module <literal>type</literal> defines exactly what is stored in the |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3301 <literal>ctx</literal> field. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3302 Its value is one of the following types: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3303 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3304 <listitem><literal>NGX_CORE_MODULE</literal></listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3305 <listitem><literal>NGX_EVENT_MODULE</literal></listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3306 <listitem><literal>NGX_HTTP_MODULE</literal></listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3307 <listitem><literal>NGX_MAIL_MODULE</literal></listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3308 <listitem><literal>NGX_STREAM_MODULE</literal></listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3309 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3310 The <literal>NGX_CORE_MODULE</literal> is the most basic and thus the most |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3311 generic and most low-level type of module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3312 The other module types are implemented on top of it and provide a more |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3313 convenient way to deal with corresponding domains, like handling events or HTTP |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3314 requests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3315 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3316 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3317 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3318 The set of core modules includes <literal>ngx_core_module</literal>, |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3319 <literal>ngx_errlog_module</literal>, <literal>ngx_regex_module</literal>, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3320 <literal>ngx_thread_pool_module</literal> and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3321 <literal>ngx_openssl_module</literal> modules. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3322 The HTTP module, the stream module, the mail module and event modules are core |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3323 modules too. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3324 The context of a core module is defined as: |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3325 <programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3326 typedef struct { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3327 ngx_str_t name; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3328 void *(*create_conf)(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3329 char *(*init_conf)(ngx_cycle_t *cycle, void *conf); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3330 } ngx_core_module_t; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3331 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3332 where the <literal>name</literal> is a module name string, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3333 <literal>create_conf</literal> and <literal>init_conf</literal> |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3334 are pointers to functions that create and initialize module configuration |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3335 respectively. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3336 For core modules, nginx calls <literal>create_conf</literal> before parsing |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3337 a new configuration and <literal>init_conf</literal> after all configuration |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3338 is parsed successfully. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3339 The typical <literal>create_conf</literal> function allocates memory for the |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3340 configuration and sets default values. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3341 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3342 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3343 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3344 For example, a simplistic module called <literal>ngx_foo_module</literal> might |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3345 look like this: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3346 <programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3347 /* |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3348 * Copyright (C) Author. |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3349 */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3350 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3351 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3352 #include <ngx_config.h> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3353 #include <ngx_core.h> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3354 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3355 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3356 typedef struct { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3357 ngx_flag_t enable; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3358 } ngx_foo_conf_t; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3359 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3360 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3361 static void *ngx_foo_create_conf(ngx_cycle_t *cycle); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3362 static char *ngx_foo_init_conf(ngx_cycle_t *cycle, void *conf); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3363 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3364 static char *ngx_foo_enable(ngx_conf_t *cf, void *post, void *data); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3365 static ngx_conf_post_t ngx_foo_enable_post = { ngx_foo_enable }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3366 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3367 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3368 static ngx_command_t ngx_foo_commands[] = { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3369 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3370 { ngx_string("foo_enabled"), |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3371 NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_FLAG, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3372 ngx_conf_set_flag_slot, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3373 0, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3374 offsetof(ngx_foo_conf_t, enable), |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3375 &ngx_foo_enable_post }, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3376 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3377 ngx_null_command |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3378 }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3379 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3380 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3381 static ngx_core_module_t ngx_foo_module_ctx = { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3382 ngx_string("foo"), |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3383 ngx_foo_create_conf, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3384 ngx_foo_init_conf |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3385 }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3386 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3387 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3388 ngx_module_t ngx_foo_module = { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3389 NGX_MODULE_V1, |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3390 &ngx_foo_module_ctx, /* module context */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3391 ngx_foo_commands, /* module directives */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3392 NGX_CORE_MODULE, /* module type */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3393 NULL, /* init master */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3394 NULL, /* init module */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3395 NULL, /* init process */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3396 NULL, /* init thread */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3397 NULL, /* exit thread */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3398 NULL, /* exit process */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3399 NULL, /* exit master */ |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3400 NGX_MODULE_V1_PADDING |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3401 }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3402 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3403 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3404 static void * |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3405 ngx_foo_create_conf(ngx_cycle_t *cycle) |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3406 { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3407 ngx_foo_conf_t *fcf; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3408 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3409 fcf = ngx_pcalloc(cycle->pool, sizeof(ngx_foo_conf_t)); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3410 if (fcf == NULL) { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3411 return NULL; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3412 } |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3413 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3414 fcf->enable = NGX_CONF_UNSET; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3415 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3416 return fcf; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3417 } |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3418 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3419 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3420 static char * |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3421 ngx_foo_init_conf(ngx_cycle_t *cycle, void *conf) |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3422 { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3423 ngx_foo_conf_t *fcf = conf; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3424 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3425 ngx_conf_init_value(fcf->enable, 0); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3426 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3427 return NGX_CONF_OK; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3428 } |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3429 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3430 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3431 static char * |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3432 ngx_foo_enable(ngx_conf_t *cf, void *post, void *data) |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3433 { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3434 ngx_flag_t *fp = data; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3435 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3436 if (*fp == 0) { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3437 return NGX_CONF_OK; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3438 } |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3439 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3440 ngx_log_error(NGX_LOG_NOTICE, cf->log, 0, "Foo Module is enabled"); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3441 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3442 return NGX_CONF_OK; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3443 } |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3444 </programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3445 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3446 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3447 </section> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3448 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3449 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3450 <section name="Configuration Directives" id="config_directives"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3451 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3452 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3453 The <literal>ngx_command_t</literal> type defines a single configuration |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3454 directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3455 Each module that supports configuration provides an array of such structures |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3456 that describe how to process arguments and what handlers to call: |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3457 <programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3458 typedef struct ngx_command_s ngx_command_t; |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3459 |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3460 struct ngx_command_s { |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3461 ngx_str_t name; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3462 ngx_uint_t type; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3463 char *(*set)(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3464 ngx_uint_t conf; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3465 ngx_uint_t offset; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3466 void *post; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3467 }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3468 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3469 Terminate the array with the special value <literal>ngx_null_command</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3470 The <literal>name</literal> is the name of a directive as it appears |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3471 in the configuration file, for example "worker_processes" or "listen". |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3472 The <literal>type</literal> is a bit-field of flags that specify the number of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3473 arguments the directive takes, its type, and the context in which it appears. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3474 The flags are: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3475 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3476 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3477 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3478 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3479 <literal>NGX_CONF_NOARGS</literal> — Directive takes no arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3480 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3481 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3482 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3483 <literal>NGX_CONF_1MORE</literal> — Directive takes one or more arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3484 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3485 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3486 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3487 <literal>NGX_CONF_2MORE</literal> — Directive takes two or more arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3488 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3489 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3490 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3491 <literal>NGX_CONF_TAKE1</literal>..<literal>NGX_CONF_TAKE7</literal> — |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3492 Directive takes exactly the indicated number of arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3493 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3494 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3495 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3496 <literal>NGX_CONF_TAKE12</literal>, <literal>NGX_CONF_TAKE13</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3497 <literal>NGX_CONF_TAKE23</literal>, <literal>NGX_CONF_TAKE123</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3498 <literal>NGX_CONF_TAKE1234</literal> — Directive may take different number of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3499 arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3500 Options are limited to the given numbers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3501 For example, <literal>NGX_CONF_TAKE12</literal> means it takes one or two |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3502 arguments. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3503 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3504 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3505 </list> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3506 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3507 The flags for directive types are: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3508 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3509 <list type="bullet"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3510 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3511 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3512 <literal>NGX_CONF_BLOCK</literal> — Directive is a block, that is, it can |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3513 contain other directives within its opening and closing curly braces, or even |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3514 implement its own parser to handle contents inside. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3515 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3516 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3517 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3518 <literal>NGX_CONF_FLAG</literal> — Directive takes a boolean value, either |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3519 <literal>on</literal> or <literal>off</literal>. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3520 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3521 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3522 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3523 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3524 A directive's context defines where it may appear in the configuration: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3525 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3526 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3527 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3528 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3529 <literal>NGX_MAIN_CONF</literal> — In the top level context. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3530 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3531 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3532 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3533 <literal>NGX_HTTP_MAIN_CONF</literal> — In the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3534 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3535 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3536 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3537 <literal>NGX_HTTP_SRV_CONF</literal> — In a <literal>server</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3538 within the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3539 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3540 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3541 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3542 <literal>NGX_HTTP_LOC_CONF</literal> — In a <literal>location</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3543 within the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3544 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3545 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3546 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3547 <literal>NGX_HTTP_UPS_CONF</literal> — In an <literal>upstream</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3548 within the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3549 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3550 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3551 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3552 <literal>NGX_HTTP_SIF_CONF</literal> — In an <literal>if</literal> block within |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3553 a <literal>server</literal> block in the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3554 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3555 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3556 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3557 <literal>NGX_HTTP_LIF_CONF</literal> — In an <literal>if</literal> block within |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3558 a <literal>location</literal> block in the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3559 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3560 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3561 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3562 <literal>NGX_HTTP_LMT_CONF</literal> — In a <literal>limit_except</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3563 block within the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3564 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3565 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3566 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3567 <literal>NGX_STREAM_MAIN_CONF</literal> — In the <literal>stream</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3568 block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3569 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3570 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3571 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3572 <literal>NGX_STREAM_SRV_CONF</literal> — In a <literal>server</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3573 within the <literal>stream</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3574 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3575 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3576 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3577 <literal>NGX_STREAM_UPS_CONF</literal> — In an <literal>upstream</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3578 within the <literal>stream</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3579 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3580 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3581 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3582 <literal>NGX_MAIL_MAIN_CONF</literal> — In the <literal>mail</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3583 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3584 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3585 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3586 <literal>NGX_MAIL_SRV_CONF</literal> — In a <literal>server</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3587 within the <literal>mail</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3588 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3589 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3590 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3591 <literal>NGX_EVENT_CONF</literal> — In the <literal>event</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3592 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3593 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3594 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3595 <literal>NGX_DIRECT_CONF</literal> — Used by modules that don't |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3596 create a hierarchy of contexts and only have one global configuration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3597 This configuration is passed to the handler as the <literal>conf</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3598 argument. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3599 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3600 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3601 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3602 The configuration parser uses these flags to throw an error in case of |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3603 a misplaced directive and calls directive handlers supplied with a proper |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3604 configuration pointer, so that the same directives in different locations can |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3605 store their values in distinct places. |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3606 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3607 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3608 <para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3609 The <literal>set</literal> field defines a handler that processes a directive |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3610 and stores parsed values into the corresponding configuration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3611 There's a number of functions that perform common conversions: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3612 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3613 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3614 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3615 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3616 <literal>ngx_conf_set_flag_slot</literal> — Converts the literal strings |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3617 <literal>on</literal> and <literal>off</literal> into an |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3618 <literal>ngx_flag_t</literal> value with values 1 or 0, respectively. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3619 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3620 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3621 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3622 <literal>ngx_conf_set_str_slot</literal> — Stores a string as a value of the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3623 <literal>ngx_str_t</literal> type. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3624 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3625 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3626 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3627 <literal>ngx_conf_set_str_array_slot</literal> — Appends a value to an array |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3628 <literal>ngx_array_t</literal> of strings <literal>ngx_str_t</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3629 The array is created if does not already exist. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3630 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3631 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3632 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3633 <literal>ngx_conf_set_keyval_slot</literal> — Appends a key-value pair to an |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3634 array <literal>ngx_array_t</literal> of key-value pairs |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3635 <literal>ngx_keyval_t</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3636 The first string becomes the key and the second the value. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3637 The array is created if it does not already exist. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3638 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3639 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3640 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3641 <literal>ngx_conf_set_num_slot</literal> — Converts a directive's argument |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3642 to an <literal>ngx_int_t</literal> value. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3643 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3644 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3645 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3646 <literal>ngx_conf_set_size_slot</literal> — Converts a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3647 <link doc="../syntax.xml">size</link> to a <literal>size_t</literal> value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3648 expressed in bytes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3649 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3650 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3651 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3652 <literal>ngx_conf_set_off_slot</literal> — Converts an |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3653 <link doc="../syntax.xml">offset</link> to an <literal>off_t</literal> value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3654 expressed in bytes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3655 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3656 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3657 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3658 <literal>ngx_conf_set_msec_slot</literal> — Converts a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3659 <link doc="../syntax.xml">time</link> to an <literal>ngx_msec_t</literal> value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3660 expressed in milliseconds. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3661 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3662 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3663 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3664 <literal>ngx_conf_set_sec_slot</literal> — Converts a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3665 <link doc="../syntax.xml">time</link> to a <literal>time_t</literal> value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3666 expressed in in seconds. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3667 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3668 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3669 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3670 <literal>ngx_conf_set_bufs_slot</literal> — Converts the two supplied arguments |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3671 into an <literal>ngx_bufs_t</literal> object that holds the number and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3672 <link doc="../syntax.xml">size</link> of buffers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3673 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3674 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3675 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3676 <literal>ngx_conf_set_enum_slot</literal> — Converts the supplied argument |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3677 into an <literal>ngx_uint_t</literal> value. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3678 The null-terminated array of <literal>ngx_conf_enum_t</literal> passed in the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3679 <literal>post</literal> field defines the acceptable strings and corresponding |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3680 integer values. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3681 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3682 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3683 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3684 <literal>ngx_conf_set_bitmask_slot</literal> — Converts the supplied arguments |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3685 into an <literal>ngx_uint_t</literal> value. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3686 The mask values for each argument are ORed producing the result. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3687 The null-terminated array of <literal>ngx_conf_bitmask_t</literal> passed in the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3688 <literal>post</literal> field defines the acceptable strings and corresponding |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3689 mask values. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3690 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3691 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3692 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3693 <literal>set_path_slot</literal> — Converts the supplied arguments to an |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3694 <literal>ngx_path_t</literal> value and performs all required initializations. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3695 For details, see the documentation for the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3696 <link doc="../http/ngx_http_proxy_module.xml" id="proxy_temp_path"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3697 proxy_temp_path</link> directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3698 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3699 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3700 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3701 <literal>set_access_slot</literal> — Converts the supplied arguments to a file |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3702 permissions mask. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3703 For details, see the documentation for the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3704 <link doc="../http/ngx_http_proxy_module.xml" id="proxy_store_access"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3705 proxy_store_access</link> directive. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3706 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3707 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3708 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3709 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3710 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3711 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3712 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3713 The <literal>conf</literal> field defines which configuration structure is |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3714 passed to the directory handler. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3715 Core modules only have the global configuration and set |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3716 <literal>NGX_DIRECT_CONF</literal> flag to access it. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3717 Modules like HTTP, Stream or Mail create hierarchies of configurations. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3718 For example, a module's configuration is created for <literal>server</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3719 <literal>location</literal> and <literal>if</literal> scopes. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3720 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3721 <list type="bullet"> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3722 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3723 <literal>NGX_HTTP_MAIN_CONF_OFFSET</literal> — Configuration for the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3724 <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3725 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3726 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3727 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3728 <literal>NGX_HTTP_SRV_CONF_OFFSET</literal> — Configuration for a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3729 <literal>server</literal> block within the <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3730 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3731 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3732 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3733 <literal>NGX_HTTP_LOC_CONF_OFFSET</literal> — Configuration for a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3734 <literal>location</literal> block within the <literal>http</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3735 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3736 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3737 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3738 <literal>NGX_STREAM_MAIN_CONF_OFFSET</literal> — Configuration for the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3739 <literal>stream</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3740 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3741 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3742 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3743 <literal>NGX_STREAM_SRV_CONF_OFFSET</literal> — Configuration for a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3744 <literal>server</literal> block within the <literal>stream</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3745 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3746 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3747 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3748 <literal>NGX_MAIL_MAIN_CONF_OFFSET</literal> — Configuration for the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3749 <literal>mail</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3750 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3751 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3752 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3753 <literal>NGX_MAIL_SRV_CONF_OFFSET</literal> — Configuration for a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3754 <literal>server</literal> block within the <literal>mail</literal> block. |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3755 </listitem> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3756 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3757 </list> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3758 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3759 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3760 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3761 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3762 The <literal>offset</literal> defines the offset of a field in a module |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3763 configuration structure that holds values for this particular directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3764 The typical use is to employ the <literal>offsetof()</literal> macro. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3765 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3766 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3767 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3768 The <literal>post</literal> field has two purposes: it may be used to define |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3769 a handler to be called after the main handler has completed, or to pass |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3770 additional data to the main handler. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3771 In the first case, the <literal>ngx_conf_post_t</literal> structure needs to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3772 be initialized with a pointer to the handler, for example: |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3773 <programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3774 static char *ngx_do_foo(ngx_conf_t *cf, void *post, void *data); |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3775 static ngx_conf_post_t ngx_foo_post = { ngx_do_foo }; |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3776 </programlisting> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3777 The <literal>post</literal> argument is the <literal>ngx_conf_post_t</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3778 object itself, and the <literal>data</literal> is a pointer to the value, |
1928
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3779 converted from arguments by the main handler with the appropriate type. |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3780 </para> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3781 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3782 </section> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3783 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3784 </section> |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3785 |
2c14a16c61eb
Added modules section to development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1920
diff
changeset
|
3786 |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3787 <section name="HTTP" id="http"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3788 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3789 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3790 <section name="Connection" id="http_connection"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3791 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3792 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3793 Each HTTP client connection runs through the following stages: |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3794 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3795 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3796 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3797 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3798 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3799 <literal>ngx_event_accept()</literal> accepts a client TCP connection. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3800 This handler is called in response to a read notification on a listen socket. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3801 A new <literal>ngx_connecton_t</literal> object is created at this stage |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3802 to wrap the newly accepted client socket. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3803 Each nginx listener provides a handler to pass the new connection object to. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3804 For HTTP connections it's <literal>ngx_http_init_connection(c)</literal>. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3805 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3806 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3807 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3808 <literal>ngx_http_init_connection()</literal> performs early initialization of |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3809 the HTTP connection. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3810 At this stage an <literal>ngx_http_connection_t</literal> object is created for |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3811 the connection and its reference is stored in the connection's |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3812 <literal>data</literal> field. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3813 Later it will be replaced by an HTTP request object. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3814 A PROXY protocol parser and the SSL handshake are started at |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3815 this stage as well. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3816 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3817 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3818 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3819 <literal>ngx_http_wait_request_handler()</literal> read event handler |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3820 is called when data is available on the client socket. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3821 At this stage an HTTP request object <literal>ngx_http_request_t</literal> is |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3822 created and set to the connection's <literal>data</literal> field. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3823 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3824 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3825 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3826 <literal>ngx_http_process_request_line()</literal> read event handler |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3827 reads client request line. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3828 The handler is set by <literal>ngx_http_wait_request_handler()</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3829 The data is read into connection's <literal>buffer</literal>. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3830 The size of the buffer is initially set by the directive |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3831 <link doc="../http/ngx_http_core_module.xml" id="client_header_buffer_size"/>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3832 The entire client header is supposed to fit in the buffer. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3833 If the initial size is not sufficient, a bigger buffer is allocated, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3834 with the capacity set by the <literal>large_client_header_buffers</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3835 directive. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3836 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3837 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3838 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3839 <literal>ngx_http_process_request_headers()</literal> read event handler, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3840 is set after <literal>ngx_http_process_request_line()</literal> to read |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3841 the client request header. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3842 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3843 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3844 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3845 <literal>ngx_http_core_run_phases()</literal> is called when the request header |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3846 is completely read and parsed. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3847 This function runs request phases from |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3848 <literal>NGX_HTTP_POST_READ_PHASE</literal> to |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3849 <literal>NGX_HTTP_CONTENT_PHASE</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3850 The last phase is intended to generate a response and pass it along the filter |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3851 chain. |
1979 | 3852 The response is not necessarily sent to the client at this phase. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3853 It might remain buffered and be sent at the finalization stage. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3854 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3855 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3856 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3857 <literal>ngx_http_finalize_request()</literal> is usually called when the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3858 request has generated all the output or produced an error. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3859 In the latter case an appropriate error page is looked up and used as the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3860 response. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3861 If the response is not completely sent to the client by this point, an |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3862 HTTP writer <literal>ngx_http_writer()</literal> is activated to finish |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3863 sending outstanding data. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3864 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3865 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3866 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3867 <literal>ngx_http_finalize_connection()</literal> is called when the complete |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3868 response has been sent to the client and the request can be destroyed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3869 If the client connection keepalive feature is enabled, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3870 <literal>ngx_http_set_keepalive()</literal> is called, which destroys the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3871 current request and waits for the next request on the connection. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3872 Otherwise, <literal>ngx_http_close_request()</literal> destroys both the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3873 request and the connection. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3874 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3875 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3876 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3877 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3878 </section> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3879 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3880 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3881 <section name="Request" id="http_request"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3882 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3883 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3884 For each client HTTP request the <literal>ngx_http_request_t</literal> object is |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3885 created. Some of the fields of this object are: |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3886 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3887 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3888 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3889 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3890 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3891 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3892 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3893 <literal>connection</literal> — Pointer to a <literal>ngx_connection_t</literal> |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3894 client connection object. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3895 Several requests can reference the same connection object at the same time - |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3896 one main request and its subrequests. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3897 After a request is deleted, a new request can be created on the same connection. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3898 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3899 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3900 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3901 Note that for HTTP connections <literal>ngx_connection_t</literal>'s |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3902 <literal>data</literal> field points back to the request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3903 Such requests are called active, as opposed to the other requests tied to the |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3904 connection. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3905 An active request is used to handle client connection events and is allowed to |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3906 output its response to the client. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3907 Normally, each request becomes active at some point so that it can send its |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3908 output. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3909 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3910 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3911 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3912 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3913 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3914 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3915 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3916 <literal>ctx</literal> — Array of HTTP module contexts. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3917 Each module of type <literal>NGX_HTTP_MODULE</literal> can store any value |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3918 (normally, a pointer to a structure) in the request. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3919 The value is stored in the <literal>ctx</literal> array at the module's |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3920 <literal>ctx_index</literal> position. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3921 The following macros provide a convenient way to get and set request contexts: |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3922 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3923 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3924 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3925 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3926 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3927 <literal>ngx_http_get_module_ctx(r, module)</literal> — Returns |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3928 the <literal>module</literal>'s context |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3929 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3930 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3931 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3932 <literal>ngx_http_set_ctx(r, c, module)</literal> — Sets <literal>c</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3933 as the <literal>module</literal>'s context |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3934 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3935 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3936 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3937 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3938 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3939 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3940 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3941 <literal>main_conf</literal>, <literal>srv_conf</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3942 <literal>loc_conf</literal> — Arrays of current request |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3943 configurations. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3944 Configurations are stored at the module's <literal>ctx_index</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3945 positions. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3946 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3947 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3948 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3949 <literal>read_event_handler</literal>, <literal>write_event_handler</literal> - |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3950 Read and write event handlers for the request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3951 Normally, both the read and write event handlers for an HTTP connection |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3952 are set to <literal>ngx_http_request_handler()</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3953 This function calls the <literal>read_event_handler</literal> and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3954 <literal>write_event_handler</literal> handlers for the currently |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3955 active request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3956 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3957 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3958 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3959 <literal>cache</literal> — Request cache object for caching the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3960 upstream response. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3961 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3962 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3963 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3964 <literal>upstream</literal> — Request upstream object for proxying. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3965 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3966 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3967 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3968 <literal>pool</literal> — Request pool. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3969 The request object itself is allocated in this pool, which is destroyed when |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3970 the request is deleted. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3971 For allocations that need to be available throughout the client connection's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3972 lifetime, use <literal>ngx_connection_t</literal>'s pool instead. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3973 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3974 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3975 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3976 <literal>header_in</literal> — Buffer into which the client HTTP request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3977 header is read. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3978 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3979 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3980 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3981 <literal>headers_in</literal>, <literal>headers_out</literal> — Input and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3982 output HTTP headers objects. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3983 Both objects contain the <literal>headers</literal> field of type |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3984 <literal>ngx_list_t</literal> for keeping the raw list of headers. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3985 In addition to that, specific headers are available for getting and setting as |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
3986 separate fields, for example <literal>content_length_n</literal>, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3987 <literal>status</literal> etc. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3988 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3989 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3990 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3991 <literal>request_body</literal> — Client request body object. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3992 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3993 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3994 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3995 <literal>start_sec</literal>, <literal>start_msec</literal> — Time point when |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3996 the request was created, used for tracking request duration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3997 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3998 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
3999 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4000 <literal>method</literal>, <literal>method_name</literal> — Numeric and text |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4001 representation of the client HTTP request method. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4002 Numeric values for methods are defined in |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4003 <literal>src/http/ngx_http_request.h</literal> with the macros |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4004 <literal>NGX_HTTP_GET</literal>, <literal>NGX_HTTP_HEAD</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4005 <literal>NGX_HTTP_POST</literal>, etc. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4006 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4007 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4008 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4009 <literal>http_protocol</literal> — Client HTTP protocol version in its |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4010 original text form (“HTTP/1.0”, “HTTP/1.1” etc). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4011 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4012 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4013 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4014 <literal>http_version</literal> — Client HTTP protocol version in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4015 numeric form (<literal>NGX_HTTP_VERSION_10</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4016 <literal>NGX_HTTP_VERSION_11</literal>, etc.). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4017 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4018 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4019 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4020 <literal>http_major</literal>, <literal>http_minor</literal> — Client HTTP |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4021 protocol version in numeric form split into major and minor parts. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4022 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4023 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4024 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4025 <literal>request_line</literal>, <literal>unparsed_uri</literal> — Request line |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4026 and URI in the original client request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4027 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4028 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4029 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4030 <literal>uri</literal>, <literal>args</literal>, <literal>exten</literal> — |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4031 URI, arguments and file extension for the current request. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4032 The URI value here might differ from the original URI sent by the client due to |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4033 normalization. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4034 Throughout request processing, these values can change as internal redirects |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4035 are performed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4036 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4037 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4038 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4039 <literal>main</literal> — Pointer to a main request object. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4040 This object is created to process a client HTTP request, as opposed to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4041 subrequests, which are created to perform a specific subtask within the main |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4042 request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4043 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4044 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4045 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4046 <literal>parent</literal> — Pointer to the parent request of a subrequest. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4047 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4048 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4049 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4050 <literal>postponed</literal> — List of output buffers and subrequests, in the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4051 order in which they are sent and created. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4052 The list is used by the postpone filter to provide consistent request output |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4053 when parts of it are created by subrequests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4054 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4055 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4056 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4057 <literal>post_subrequest</literal> — Pointer to a handler with the context |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4058 to be called when a subrequest gets finalized. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4059 Unused for main requests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4060 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4061 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4062 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4063 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4064 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4065 <literal>posted_requests</literal> — List of requests to be started or |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4066 resumed, which is done by calling the request's |
1932 | 4067 <literal>write_event_handler</literal>. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4068 Normally, this handler holds the request main function, which at first runs |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4069 request phases and then produces the output. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4070 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4071 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4072 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4073 A request is usually posted by the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4074 <literal>ngx_http_post_request(r, NULL)</literal> call. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4075 It is always posted to the main request <literal>posted_requests</literal> list. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4076 The function <literal>ngx_http_run_posted_requests(c)</literal> runs all |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4077 requests that are posted in the main request of the passed |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4078 connection's active request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4079 All event handlers call <literal>ngx_http_run_posted_requests</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4080 which can lead to new posted requests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4081 Normally, it is called after invoking a request's read or write handler. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4082 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4083 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4084 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4085 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4086 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4087 <literal>phase_handler</literal> — Index of current request phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4088 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4089 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4090 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4091 <literal>ncaptures</literal>, <literal>captures</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4092 <literal>captures_data</literal> — Regex captures produced |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4093 by the last regex match of the request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4094 A regex match can occur at a number of places during request processing: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4095 map lookup, server lookup by SNI or HTTP Host, rewrite, proxy_redirect, etc. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4096 Captures produced by a lookup are stored in the above mentioned fields. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4097 The field <literal>ncaptures</literal> holds the number of captures, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4098 <literal>captures</literal> holds captures boundaries and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4099 <literal>captures_data</literal> holds the string against which the regex was |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4100 matched and which is used to extract captures. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4101 After each new regex match, request captures are reset to hold new values. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4102 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4103 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4104 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4105 <literal>count</literal> — Request reference counter. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4106 The field only makes sense for the main request. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4107 Increasing the counter is done by simple <literal>r->main->count++</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4108 To decrease the counter, call |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4109 <literal>ngx_http_finalize_request(r, rc)</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4110 Creating of a subrequest and running the request body read process both |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4111 increment the counter. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4112 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4113 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4114 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4115 <literal>subrequests</literal> — Current subrequest nesting level. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4116 Each subrequest inherits its parent's nesting level, decreased by one. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4117 An error is generated if the value reaches zero. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4118 The value for the main request is defined by the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4119 <literal>NGX_HTTP_MAX_SUBREQUESTS</literal> constant. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4120 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4121 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4122 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4123 <literal>uri_changes</literal> — Number of URI changes remaining for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4124 the request. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4125 The total number of times a request can change its URI is limited by the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4126 <literal>NGX_HTTP_MAX_URI_CHANGES</literal> constant. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4127 With each change the value is decremented until it reaches zero, at which time |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4128 an error is generated. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4129 Rewrites and internal redirects to normal or named locations are considered URI |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4130 changes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4131 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4132 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4133 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4134 <literal>blocked</literal> — Counter of blocks held on the request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4135 While this value is non-zero, the request cannot be terminated. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4136 Currently, this value is increased by pending AIO operations (POSIX AIO and |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4137 thread operations) and active cache lock. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4138 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4139 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4140 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4141 <literal>buffered</literal> — Bitmask showing which modules have buffered the |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4142 output produced by the request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4143 A number of filters can buffer output; for example, sub_filter can buffer data |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4144 because of a partial string match, copy filter can buffer data because of the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4145 lack of free output buffers etc. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4146 As long as this value is non-zero, the request is not finalized |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4147 pending the flush. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4148 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4149 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4150 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4151 <literal>header_only</literal> — Flag indicating that the output does not |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4152 require a body. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4153 For example, this flag is used by HTTP HEAD requests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4154 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4155 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4156 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4157 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4158 <literal>keepalive</literal> — Flag indicating whether client connection |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4159 keepalive is supported. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4160 The value is inferred from the HTTP version and the value of the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4161 <header>Connection</header> header. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4162 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4163 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4164 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4165 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4166 <literal>header_sent</literal> — Flag indicating that the output header |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4167 has already been sent by the request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4168 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4169 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4170 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4171 <literal>internal</literal> — Flag indicating that the current request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4172 is internal. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4173 To enter the internal state, a request must pass through an internal |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4174 redirect or be a subrequest. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4175 Internal requests are allowed to enter internal locations. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4176 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4177 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4178 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4179 <literal>allow_ranges</literal> — Flag indicating that a partial response |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4180 can be sent to the client, as requested by the HTTP Range header. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4181 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4182 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4183 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4184 <literal>subrequest_ranges</literal> — Flag indicating that a partial response |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4185 can be sent while a subrequest is being processed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4186 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4187 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4188 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4189 <literal>single_range</literal> — Flag indicating that only a single continuous |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4190 range of output data can be sent to the client. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4191 This flag is usually set when sending a stream of data, for example from a |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4192 proxied server, and the entire response is not available in one buffer. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4193 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4194 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4195 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4196 <literal>main_filter_need_in_memory</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4197 <literal>filter_need_in_memory</literal> — Flags |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4198 requesting that the output produced in memory buffers rather than files. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4199 This is a signal to the copy filter to read data from file buffers even if |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4200 sendfile is enabled. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4201 The difference between the two flags is the location of the filter modules that |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4202 set them. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4203 Filters called before the postpone filter in the filter chain set |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4204 <literal>filter_need_in_memory</literal>, requesting that only the current |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4205 request output come in memory buffers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4206 Filters called later in the filter chain set |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4207 <literal>main_filter_need_in_memory</literal>, requesting that |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4208 both the main request and all subrequests read files in memory |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4209 while sending output. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4210 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4211 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4212 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4213 <literal>filter_need_temporary</literal> — Flag requesting that the request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4214 output be produced in temporary buffers, but not in readonly memory buffers or |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4215 file buffers. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4216 This is used by filters which may change output directly in the buffers where |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4217 it's sent.</listitem> |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4218 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4219 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4220 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4221 </section> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4222 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4223 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4224 <section name="Configuration" id="http_conf"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4225 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4226 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4227 Each HTTP module can have three types of configuration: |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4228 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4229 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4230 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4231 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4232 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4233 Main configuration — Applies to the entire <literal>http</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4234 Functions as global settings for a module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4235 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4236 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4237 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4238 Server configuration — Applies to a single <literal>server</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4239 Functions as server-specific settings for a module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4240 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4241 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4242 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4243 Location configuration — Applies to a single <literal>location</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4244 <literal>if</literal> or <literal>limit_except</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4245 Functions as location-specific settings for a module. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4246 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4247 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4248 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4249 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4250 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4251 Configuration structures are created at the nginx configuration stage by |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4252 calling functions, which allocate the structures, initialize them |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4253 and merge them. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4254 The following example shows how to create a simple location |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4255 configuration for a module. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4256 The configuration has one setting, <literal>foo</literal>, of type |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4257 unsigned integer. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4258 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4259 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4260 <programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4261 typedef struct { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4262 ngx_uint_t foo; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4263 } ngx_http_foo_loc_conf_t; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4264 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4265 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4266 static ngx_http_module_t ngx_http_foo_module_ctx = { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4267 NULL, /* preconfiguration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4268 NULL, /* postconfiguration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4269 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4270 NULL, /* create main configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4271 NULL, /* init main configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4272 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4273 NULL, /* create server configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4274 NULL, /* merge server configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4275 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4276 ngx_http_foo_create_loc_conf, /* create location configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4277 ngx_http_foo_merge_loc_conf /* merge location configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4278 }; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4279 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4280 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4281 static void * |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4282 ngx_http_foo_create_loc_conf(ngx_conf_t *cf) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4283 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4284 ngx_http_foo_loc_conf_t *conf; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4285 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4286 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_foo_loc_conf_t)); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4287 if (conf == NULL) { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4288 return NULL; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4289 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4290 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4291 conf->foo = NGX_CONF_UNSET_UINT; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4292 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4293 return conf; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4294 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4295 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4296 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4297 static char * |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4298 ngx_http_foo_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4299 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4300 ngx_http_foo_loc_conf_t *prev = parent; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4301 ngx_http_foo_loc_conf_t *conf = child; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4302 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4303 ngx_conf_merge_uint_value(conf->foo, prev->foo, 1); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4304 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4305 </programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4306 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4307 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4308 As seen in the example, the <literal>ngx_http_foo_create_loc_conf()</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4309 function creates a new configuration structure, and |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4310 <literal>ngx_http_foo_merge_loc_conf()</literal> merges a configuration with |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4311 configuration from a higher level. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4312 In fact, server and location configuration do not exist only at the server and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4313 location levels, but are also created for all levels above them. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4314 Specifically, a server configuration is also created at the main level and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4315 location configurations are created at the main, server, and location levels. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4316 These configurations make it possible to specify server- and location-specific |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4317 settings at any level of an nginx configuration file. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4318 Eventually configurations are merged down. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4319 A number of macros like <literal>NGX_CONF_UNSET</literal> and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4320 <literal>NGX_CONF_UNSET_UINT</literal> are provided |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4321 for indicating a missing setting and ignoring it while merging. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4322 Standard nginx merge macros like <literal>ngx_conf_merge_value()</literal> and |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4323 <literal>ngx_conf_merge_uint_value()</literal> provide a convenient way to |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4324 merge a setting and set the default value if none of the configurations |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4325 provided an explicit value. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4326 For complete list of macros for different types, see |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4327 <literal>src/core/ngx_conf_file.h</literal>. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4328 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4329 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4330 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4331 The following macros are available. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4332 for accessing configuration for HTTP modules at configuration time. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4333 They all take <literal>ngx_conf_t</literal> reference as the first argument. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4334 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4335 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4336 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4337 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4338 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4339 <literal>ngx_http_conf_get_module_main_conf(cf, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4340 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4341 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4342 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4343 <literal>ngx_http_conf_get_module_srv_conf(cf, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4344 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4345 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4346 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4347 <literal>ngx_http_conf_get_module_loc_conf(cf, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4348 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4349 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4350 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4351 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4352 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4353 The following example gets a pointer to a location configuration of |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4354 standard nginx core module |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
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1928
diff
changeset
|
4355 <link doc="../http/ngx_http_core_module.xml">ngx_http_core_module</link> |
2007
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Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4356 and replaces the location content handler kept |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4357 in the <literal>handler</literal> field of the structure. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4358 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4359 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4360 <programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4361 static ngx_int_t ngx_http_foo_handler(ngx_http_request_t *r); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4362 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4363 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4364 static ngx_command_t ngx_http_foo_commands[] = { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4365 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4366 { ngx_string("foo"), |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4367 NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS, |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4368 ngx_http_foo, |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4369 0, |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4370 0, |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4371 NULL }, |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4372 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4373 ngx_null_command |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4374 }; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4375 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4376 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4377 static char * |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4378 ngx_http_foo(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4379 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4380 ngx_http_core_loc_conf_t *clcf; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4381 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4382 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4383 clcf->handler = ngx_http_bar_handler; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4384 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4385 return NGX_CONF_OK; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4386 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4387 </programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4388 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4389 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4390 The following macros are available for accessing configuration for HTTP |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4391 modules at runtime. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4392 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4393 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4394 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4395 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4396 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4397 <literal>ngx_http_get_module_main_conf(r, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4398 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4399 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4400 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4401 <literal>ngx_http_get_module_srv_conf(r, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4402 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4403 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4404 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4405 <literal>ngx_http_get_module_loc_conf(r, module)</literal> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4406 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4407 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4408 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4409 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4410 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4411 These macros receive a reference to an HTTP request |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4412 <literal>ngx_http_request_t</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4413 The main configuration of a request never changes. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4414 Server configuration can change from the default after |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4415 the virtual server for the request is chosen. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4416 Location configuration selected for processing a request can change multiple |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4417 times as a result of a rewrite operation or internal redirect. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4418 The following example shows how to access a module's HTTP configuration at |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4419 runtime. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4420 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4421 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4422 <programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4423 static ngx_int_t |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4424 ngx_http_foo_handler(ngx_http_request_t *r) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4425 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4426 ngx_http_foo_loc_conf_t *flcf; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4427 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4428 flcf = ngx_http_get_module_loc_conf(r, ngx_http_foo_module); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4429 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4430 ... |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4431 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4432 </programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4433 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4434 </section> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4435 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4436 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4437 <section name="Phases" id="http_phases"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4438 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4439 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4440 Each HTTP request passes through a sequence of phases. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4441 In each phase a distinct type of processing is performed on the request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4442 Module-specific handlers can be registered in most phases, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4443 and many standard nginx modules register their phase handlers as a way |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4444 to get called at a specific stage of request processing. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4445 Phases are processed successively and the phase handlers are called |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4446 once the request reaches the phase. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4447 Following is the list of nginx HTTP phases. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4448 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4449 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4450 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4451 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4452 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4453 <literal>NGX_HTTP_POST_READ_PHASE</literal> — First phase. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4454 The <link doc="../http/ngx_http_realip_module.xml">ngx_http_realip_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4455 registers its handler at this phase to enable |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4456 substitution of client addresses before any other module is invoked. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4457 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4458 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4459 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4460 <literal>NGX_HTTP_SERVER_REWRITE_PHASE</literal> — Phase where |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4461 rewrite directives defined in a <literal>server</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4462 (but outside a <literal>location</literal> block) are processed. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4463 The |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4464 <link doc="../http/ngx_http_rewrite_module.xml">ngx_http_rewrite_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4465 installs its handler at this phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4466 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4467 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4468 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4469 <literal>NGX_HTTP_FIND_CONFIG_PHASE</literal> — Special phase |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4470 where a location is chosen based on the request URI. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4471 Before this phase, the default location for the relevant virtual server |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4472 is assigned to the request, and any module requesting a location configuration |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4473 receives the configuration for the default server location. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4474 This phase a assigns a new location to the request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4475 No additional handlers can be registered at this phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4476 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4477 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4478 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4479 <literal>NGX_HTTP_REWRITE_PHASE</literal> — Same as |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4480 <literal>NGX_HTTP_SERVER_REWRITE_PHASE</literal>, but for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4481 rewrite rules defined in the location, chosen in the previous phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4482 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4483 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4484 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4485 <literal>NGX_HTTP_POST_REWRITE_PHASE</literal> — Special phase |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4486 where the request is redirected to a new location if its URI changed |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4487 during a rewrite. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4488 This is implemented by the request going through |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4489 the <literal>NGX_HTTP_FIND_CONFIG_PHASE</literal> again. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4490 No additional handlers can be registered at this phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4491 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4492 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4493 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4494 <literal>NGX_HTTP_PREACCESS_PHASE</literal> — A common phase for different |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4495 types of handlers, not associated with access control. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4496 The standard nginx modules |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4497 <link doc="../http/ngx_http_limit_conn_module.xml">ngx_http_limit_conn_module |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4498 </link> and |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4499 <link doc="../http/ngx_http_limit_req_module.xml"> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4500 ngx_http_limit_req_module</link> register their handlers at this phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4501 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4502 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4503 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4504 <literal>NGX_HTTP_ACCESS_PHASE</literal> — Phase where it is verified |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4505 that the client is authorized to make the request. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4506 Standard nginx modules such as |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4507 <link doc="../http/ngx_http_access_module.xml">ngx_http_access_module</link> and |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4508 <link doc="../http/ngx_http_auth_basic_module.xml">ngx_http_auth_basic_module |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4509 </link> register their handlers at this phase. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4510 By default the client must pass the authorization check of all handlers |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4511 registered at this phase for the request to continue to the next phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4512 The <link doc="../http/ngx_http_core_module.xml" id="satisfy"/> directive, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4513 can be used to permit processing to continue if any of the phase handlers |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4514 authorizes the client. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4515 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4516 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4517 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4518 <literal>NGX_HTTP_POST_ACCESS_PHASE</literal> — Special phase where the |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4519 <link doc="../http/ngx_http_core_module.xml" id="satisfy">satisfy any</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4520 directive is processed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4521 If some access phase handlers denied access and none explictly allowed it, the |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4522 request is finalized. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4523 No additional handlers can be registered at this phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4524 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4525 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4526 <listitem> |
2024
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4527 <literal>NGX_HTTP_PRECONTENT_PHASE</literal> — Phase for handlers to be called |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4528 prior to generating content. |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4529 Standard modules such as |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4530 <link doc="../http/ngx_http_core_module.xml" id="try_files"> |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4531 ngx_http_try_files_module</link> and |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4532 <link doc="../http/ngx_http_mirror_module.xml">ngx_http_mirror_module</link> |
a8d1a748324f
DevGuide: mentioned the precontent phase.
Roman Arutyunyan <arut@nginx.com>
parents:
2023
diff
changeset
|
4533 register their handlers at this phase. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4534 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4535 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4536 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4537 <literal>NGX_HTTP_CONTENT_PHASE</literal> — Phase where the response |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4538 is normally generated. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4539 Multiple nginx standard modules register their handlers at this phase, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4540 including |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4541 <link doc="../http/ngx_http_index_module.xml">ngx_http_index_module</link> or |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4542 <literal>ngx_http_static_module</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4543 They are called sequentially until one of them produces |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4544 the output. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4545 It's also possible to set content handlers on a per-location basis. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4546 If the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4547 <link doc="../http/ngx_http_core_module.xml">ngx_http_core_module</link>'s |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4548 location configuration has <literal>handler</literal> set, it is |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4549 called as the content handler and the handlers installed at this phase |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4550 are ignored. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4551 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4552 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4553 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4554 <literal>NGX_HTTP_LOG_PHASE</literal> — Phase where request logging |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4555 is performed. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4556 Currently, only the |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4557 <link doc="../http/ngx_http_log_module.xml">ngx_http_log_module</link> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4558 registers its handler |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4559 at this stage for access logging. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4560 Log phase handlers are called at the very end of request processing, right |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4561 before freeing the request. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4562 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4563 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4564 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4565 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4566 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4567 Following is the example of a preaccess phase handler. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4568 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4569 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4570 <programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4571 static ngx_http_module_t ngx_http_foo_module_ctx = { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4572 NULL, /* preconfiguration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4573 ngx_http_foo_init, /* postconfiguration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4574 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4575 NULL, /* create main configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4576 NULL, /* init main configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4577 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4578 NULL, /* create server configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4579 NULL, /* merge server configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4580 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4581 NULL, /* create location configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4582 NULL /* merge location configuration */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4583 }; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4584 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4585 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4586 static ngx_int_t |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4587 ngx_http_foo_handler(ngx_http_request_t *r) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4588 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4589 ngx_str_t *ua; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4590 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4591 ua = r->headers_in->user_agent; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4592 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4593 if (ua == NULL) { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4594 return NGX_DECLINED; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4595 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4596 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4597 /* reject requests with "User-Agent: foo" */ |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4598 if (ua->value.len == 3 && ngx_strncmp(ua->value.data, "foo", 3) == 0) { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4599 return NGX_HTTP_FORBIDDEN; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4600 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4601 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4602 return NGX_DECLINED; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4603 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4604 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4605 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4606 static ngx_int_t |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4607 ngx_http_foo_init(ngx_conf_t *cf) |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4608 { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4609 ngx_http_handler_pt *h; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4610 ngx_http_core_main_conf_t *cmcf; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4611 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4612 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4613 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4614 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4615 if (h == NULL) { |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4616 return NGX_ERROR; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4617 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4618 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4619 *h = ngx_http_foo_handler; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4620 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4621 return NGX_OK; |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4622 } |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4623 </programlisting> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4624 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4625 <para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4626 Phase handlers are expected to return specific codes: |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4627 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4628 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4629 <list type="bullet"> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4630 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4631 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4632 <literal>NGX_OK</literal> — Proceed to the next phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4633 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4634 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4635 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4636 <literal>NGX_DECLINED</literal> — Proceed to the next handler of the current |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4637 phase. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4638 If the current handler is the last in the current phase, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4639 move to the next phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4640 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4641 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4642 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4643 <literal>NGX_AGAIN</literal>, <literal>NGX_DONE</literal> — Suspend |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4644 phase handling until some future event which can be |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4645 an asynchronous I/O operation or just a delay, for example. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4646 It is assumed, that phase handling will be resumed later by calling |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4647 <literal>ngx_http_core_run_phases()</literal>. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4648 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4649 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4650 <listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4651 Any other value returned by the phase handler is treated as a request |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4652 finalization code, in particular, an HTTP response code. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4653 The request is finalized with the code provided. |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4654 </listitem> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4655 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4656 </list> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4657 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4658 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4659 For some phases, return codes are treated in a slightly different way. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4660 At the content phase, any return code other that |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4661 <literal>NGX_DECLINED</literal> is considered a finalization code. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4662 Any return code from the location content handlers is considered a |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4663 finalization code. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4664 At the access phase, in |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4665 <link doc="../http/ngx_http_core_module.xml" id="satisfy">satisfy any</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4666 mode, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4667 any return code other than <literal>NGX_OK</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4668 <literal>NGX_DECLINED</literal>, <literal>NGX_AGAIN</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4669 <literal>NGX_DONE</literal> is considered a denial. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4670 If no subsequent access handlers allow or deny access with a different |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4671 code, the denial code will become the finalization code. |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4672 </para> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4673 |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4674 </section> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
4675 |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
4676 |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4677 <section name="Variables" id="http_variables"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4678 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4679 <section name="Accessing existing variables" id="http_existing_variables"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4680 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4681 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4682 Variables can be referenced by index (this is the most common method) |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4683 or name (see <link id="http_creating_variables">below</link>). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4684 The index is created at configuration stage, when a variable is added |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4685 to the configuration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4686 To obtain the variable index, use |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4687 <literal>ngx_http_get_variable_index()</literal>: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4688 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4689 ngx_str_t name; /* ngx_string("foo") */ |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4690 ngx_int_t index; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4691 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4692 index = ngx_http_get_variable_index(cf, &name); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4693 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4694 Here, <literal>cf</literal> is a pointer to nginx configuration and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4695 <literal>name</literal> points to a string containing the variable name. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4696 The function returns <literal>NGX_ERROR</literal> on error or a valid index |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4697 otherwise, which is typically stored somewhere in the module's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4698 configuration for future use. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4699 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4700 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4701 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4702 All HTTP variables are evaluated in the context of a given HTTP request, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4703 and results are specific to and cached in that HTTP request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4704 All functions that evaluate variables return the |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4705 <literal>ngx_http_variable_value_t</literal> type, representing |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4706 the variable value: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4707 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4708 typedef ngx_variable_value_t ngx_http_variable_value_t; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4709 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4710 typedef struct { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4711 unsigned len:28; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4712 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4713 unsigned valid:1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4714 unsigned no_cacheable:1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4715 unsigned not_found:1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4716 unsigned escape:1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4717 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4718 u_char *data; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4719 } ngx_variable_value_t; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4720 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4721 where: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4722 <list type="bullet"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4723 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4724 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4725 <literal>len</literal> — The length of the value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4726 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4727 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4728 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4729 <literal>data</literal> — The value itself |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4730 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4731 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4732 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4733 <literal>valid</literal> — The value is valid |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4734 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4735 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4736 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4737 <literal>not_found</literal> — The variable was not found and thus |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4738 the <literal>data</literal> and <literal>len</literal> fields are irrelevant; |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4739 this can happen, for example, with variables like <var>$arg_foo</var> |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4740 when a corresponding argument was not passed in a request |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4741 </listitem> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4742 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4743 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4744 <literal>no_cacheable</literal> — Do not cache result |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4745 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4746 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4747 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4748 <literal>escape</literal> — Used internally by the logging module to mark |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4749 values that require escaping on output. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4750 </listitem> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4751 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4752 </list> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4753 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4754 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4755 <para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4756 The <literal>ngx_http_get_flushed_variable()</literal> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4757 and <literal>ngx_http_get_indexed_variable()</literal> functions |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4758 are used to obtain the value of a variable. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4759 They have the same interface - accepting an HTTP request <literal>r</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4760 as a context for evaluating the variable and an <literal>index</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4761 that identifies it. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4762 An example of typical usage: |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4763 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4764 ngx_http_variable_value_t *v; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4765 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4766 v = ngx_http_get_flushed_variable(r, index); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4767 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4768 if (v == NULL || v->not_found) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4769 /* we failed to get value or there is no such variable, handle it */ |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4770 return NGX_ERROR; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4771 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4772 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4773 /* some meaningful value is found */ |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4774 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4775 The difference between functions is that the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4776 <literal>ngx_http_get_indexed_variable()</literal> returns a cached value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4777 and <literal>ngx_http_get_flushed_variable()</literal> flushes the cache for |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4778 non-cacheable variables. |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4779 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4780 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4781 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4782 Some modules, such as SSI and Perl, need to deal with variables for which the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4783 name is not known at configuration time. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4784 An index therefore cannot be used to access them, but the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4785 <literal>ngx_http_get_variable(r, name, key)</literal> function |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4786 is available. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4787 It searches for a variable with a given |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4788 <literal>name</literal> and its hash <literal>key</literal> derived |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4789 from the name. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4790 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4791 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4792 </section> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4793 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4794 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4795 <section name="Creating variables" id="http_creating_variables"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4796 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4797 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4798 To create a variable, use the <literal>ngx_http_add_variable()</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4799 function. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4800 It takes as arguments a configuration (where the variable is registered), |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4801 the variable name and flags that control the function's behaviour: |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4802 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4803 <list type="bullet"> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4804 <listitem><literal>NGX_HTTP_VAR_CHANGEABLE</literal> — Enables redefinition of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4805 the variable: there is no conflict if another module defines a variable with |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4806 the same name. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4807 This allows the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4808 <link doc="../http/ngx_http_rewrite_module.xml" id="set"/> directive |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4809 to override variables. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4810 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4811 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4812 <listitem><literal>NGX_HTTP_VAR_NOCACHEABLE</literal> — Disables caching, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4813 which is useful for variables such as <literal>$time_local</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4814 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4815 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4816 <listitem><literal>NGX_HTTP_VAR_NOHASH</literal> — Indicates that |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4817 this variable is only accessible by index, not by name. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4818 This is a small optimization for use when it is known that the |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4819 variable is not needed in modules like SSI or Perl. |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4820 </listitem> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4821 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4822 <listitem><literal>NGX_HTTP_VAR_PREFIX</literal> — The name of the |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4823 variable is a prefix. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4824 In this case, a handler must implement additional logic to obtain the value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4825 of a specific variable. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4826 For example, all “<literal>arg_</literal>” variables are processed by the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4827 same handler, which performs lookup in request arguments and returns the value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4828 of a specific argument. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4829 </listitem> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4830 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4831 </list> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4832 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4833 The function returns NULL in case of error or a pointer to |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4834 <literal>ngx_http_variable_t</literal> otherwise: |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4835 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4836 struct ngx_http_variable_s { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4837 ngx_str_t name; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4838 ngx_http_set_variable_pt set_handler; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4839 ngx_http_get_variable_pt get_handler; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4840 uintptr_t data; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4841 ngx_uint_t flags; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4842 ngx_uint_t index; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4843 }; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4844 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4845 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4846 The <literal>get</literal> and <literal>set</literal> handlers |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4847 are called to obtain or set the variable value, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4848 <literal>data</literal> is passed to variable handlers, and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4849 <literal>index</literal> holds assigned variable index used to reference |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4850 the variable. |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4851 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4852 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4853 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4854 Usually, a null-terminated static array of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4855 <literal>ngx_http_variable_t</literal> structures is created |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4856 by a module and processed at the preconfiguration stage to add variables |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4857 into the configuration, for example: |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4858 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4859 static ngx_http_variable_t ngx_http_foo_vars[] = { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4860 |
2009
9b7302e3b21f
DevGuide: fixed variables example.
Vladimir Homutov <vl@nginx.com>
parents:
2008
diff
changeset
|
4861 { ngx_string("foo_v1"), NULL, ngx_http_foo_v1_variable, 0, 0, 0 }, |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4862 |
2023
ec34516cbd1b
DevGuide: documented macros for null variables.
Vladimir Homutov <vl@nginx.com>
parents:
2009
diff
changeset
|
4863 ngx_http_null_variable |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4864 }; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4865 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4866 static ngx_int_t |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4867 ngx_http_foo_add_variables(ngx_conf_t *cf) |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4868 { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4869 ngx_http_variable_t *var, *v; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4870 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4871 for (v = ngx_http_foo_vars; v->name.len; v++) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4872 var = ngx_http_add_variable(cf, &v->name, v->flags); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4873 if (var == NULL) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4874 return NGX_ERROR; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4875 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4876 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4877 var->get_handler = v->get_handler; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4878 var->data = v->data; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4879 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4880 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4881 return NGX_OK; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4882 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4883 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4884 This function in the example is used to initialize |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4885 the <literal>preconfiguration</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4886 field of the HTTP module context and is called before the parsing of HTTP |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4887 configuration, so that the parser can refer to these variables. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4888 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4889 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4890 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4891 The <literal>get</literal> handler is responsible for evaluating a variable |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4892 in the context of a specific request, for example: |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4893 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4894 static ngx_int_t |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4895 ngx_http_variable_connection(ngx_http_request_t *r, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4896 ngx_http_variable_value_t *v, uintptr_t data) |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4897 { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4898 u_char *p; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4899 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4900 p = ngx_pnalloc(r->pool, NGX_ATOMIC_T_LEN); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4901 if (p == NULL) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4902 return NGX_ERROR; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4903 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4904 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4905 v->len = ngx_sprintf(p, "%uA", r->connection->number) - p; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4906 v->valid = 1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4907 v->no_cacheable = 0; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4908 v->not_found = 0; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4909 v->data = p; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4910 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4911 return NGX_OK; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4912 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4913 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4914 It returns <literal>NGX_ERROR</literal> in case of internal error |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4915 (for example, failed memory allocation) or <literal>NGX_OK</literal> otherwise. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4916 To learn the status of variable evaluation, inspect the flags |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4917 in <literal>ngx_http_variable_value_t</literal> (see the description |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4918 <link id="http_existing_variables">above</link>). |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4919 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4920 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4921 <para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4922 The <literal>set</literal> handler allows setting the property |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4923 referenced by the variable. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4924 For example, the set handler of the <literal>$limit_rate</literal> variable |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4925 modifies the request's <literal>limit_rate</literal> field: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4926 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4927 ... |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4928 { ngx_string("limit_rate"), ngx_http_variable_request_set_size, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4929 ngx_http_variable_request_get_size, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4930 offsetof(ngx_http_request_t, limit_rate), |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4931 NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE, 0 }, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4932 ... |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4933 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4934 static void |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4935 ngx_http_variable_request_set_size(ngx_http_request_t *r, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4936 ngx_http_variable_value_t *v, uintptr_t data) |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4937 { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4938 ssize_t s, *sp; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4939 ngx_str_t val; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4940 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4941 val.len = v->len; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4942 val.data = v->data; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4943 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4944 s = ngx_parse_size(&val); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4945 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4946 if (s == NGX_ERROR) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4947 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4948 "invalid size \"%V\"", &val); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4949 return; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4950 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4951 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4952 sp = (ssize_t *) ((char *) r + data); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4953 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4954 *sp = s; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4955 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4956 return; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4957 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4958 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4959 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4960 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4961 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4962 </section> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4963 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4964 </section> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4965 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4966 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4967 <section name="Complex values" id="http_complex_values"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4968 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4969 <para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4970 A complex value, despite its name, provides an easy way to evaluate |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4971 expressions which can contain text, variables, and their combination. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4972 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4973 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4974 <para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4975 The complex value description in |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4976 <literal>ngx_http_compile_complex_value</literal> is compiled at the |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4977 configuration stage into <literal>ngx_http_complex_value_t</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
4978 which is used at runtime to obtain results of expression evaluation. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4979 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4980 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4981 ngx_str_t *value; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4982 ngx_http_complex_value_t cv; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4983 ngx_http_compile_complex_value_t ccv; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4984 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4985 value = cf->args->elts; /* directive arguments */ |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4986 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4987 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4988 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4989 ccv.cf = cf; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4990 ccv.value = &value[1]; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4991 ccv.complex_value = &cv; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4992 ccv.zero = 1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4993 ccv.conf_prefix = 1; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4994 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4995 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4996 return NGX_CONF_ERROR; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4997 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4998 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
4999 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5000 Here, <literal>ccv</literal> holds all parameters that are required to |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5001 initialize the complex value <literal>cv</literal>: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5002 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5003 <list type="bullet"> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5004 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5005 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5006 <literal>cf</literal> — Configuration pointer |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5007 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5008 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5009 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5010 <literal>value</literal> — String to be parsed (input) |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5011 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5012 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5013 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5014 <literal>complex_value</literal> — Compiled value (output) |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5015 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5016 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5017 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5018 <literal>zero</literal> — Flag that enables zero-terminating value |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5019 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5020 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5021 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5022 <literal>conf_prefix</literal> — Prefixes the result with the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5023 configuration prefix (the directory where nginx is currently looking for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5024 configuration) |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5025 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5026 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5027 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5028 <literal>root_prefix</literal> — Prefixes the result with the root prefix |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5029 (the normal nginx installation prefix) |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5030 </listitem> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5031 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5032 </list> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5033 The <literal>zero</literal> flag is useful when results are to be passed to |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5034 libraries that require zero-terminated strings, and prefixes are handy when |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5035 dealing with filenames. |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5036 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5037 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5038 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5039 Upon successful compilation, <literal>cv.lengths</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5040 contains information about the presence of variables |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5041 in the expression. |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5042 The NULL value means that the expression contained static text only, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5043 and so can be stored in a simple string rather than as a complex value. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5044 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5045 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5046 <para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5047 The <literal>ngx_http_set_complex_value_slot()</literal> is a convenient |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5048 function used to initialize a complex value completely in the directive |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5049 declaration itself. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5050 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5051 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5052 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5053 At runtime, a complex value can be calculated using the |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5054 <literal>ngx_http_complex_value()</literal> function: |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5055 <programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5056 ngx_str_t res; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5057 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5058 if (ngx_http_complex_value(r, &cv, &res) != NGX_OK) { |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5059 return NGX_ERROR; |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5060 } |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5061 </programlisting> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5062 Given the request <literal>r</literal> and previously compiled |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5063 value <literal>cv</literal>, the function evaluates the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5064 expression and writes the result to <literal>res</literal>. |
1959
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5065 </para> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5066 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5067 </section> |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5068 |
d0aebb2337ec
Added the "Variables" section to the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1958
diff
changeset
|
5069 |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5070 <section name="Request redirection" id="http_request_redirection"> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5071 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5072 <para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5073 An HTTP request is always connected to a location via the |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5074 <literal>loc_conf</literal> field of the <literal>ngx_http_request_t</literal> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5075 structure. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5076 This means that at any point the location configuration of any module can be |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5077 retrieved from the request by calling |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5078 <literal>ngx_http_get_module_loc_conf(r, module)</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5079 Request location can change several times during the request's lifetime. |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5080 Initially, a default server location of the default server is assigned to a |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5081 request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5082 If the request switches to a different server (chosen by the HTTP |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5083 <header>Host</header> header or SSL SNI extension), the request switches to the |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5084 default location of that server as well. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5085 The next change of the location takes place at the |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5086 <literal>NGX_HTTP_FIND_CONFIG_PHASE</literal> request phase. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5087 At this phase a location is chosen by request URI among all non-named locations |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5088 configured for the server. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5089 The |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5090 <link doc="../http/ngx_http_rewrite_module.xml">ngx_http_rewrite_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5091 can change the request URI at the |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5092 <literal>NGX_HTTP_REWRITE_PHASE</literal> request phase as a result of |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5093 the <link doc="../http/ngx_http_rewrite_module.xml" id="rewrite">rewrite</link> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5094 directive and send the request back |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5095 to the <literal>NGX_HTTP_FIND_CONFIG_PHASE</literal> phase for selection of a |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5096 new location based on the new URI. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5097 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5098 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5099 <para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5100 It is also possible to redirect a request to a new location at any point by |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5101 calling one of |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5102 <literal>ngx_http_internal_redirect(r, uri, args)</literal> or |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5103 <literal>ngx_http_named_location(r, name)</literal>. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5104 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5105 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5106 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5107 The <literal>ngx_http_internal_redirect(r, uri, args)</literal> function changes |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5108 the request URI and returns the request to the |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5109 <literal>NGX_HTTP_SERVER_REWRITE_PHASE</literal> phase. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5110 The request proceeds with a server default location. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5111 Later at <literal>NGX_HTTP_FIND_CONFIG_PHASE</literal> a new location is chosen |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5112 based on the new request URI. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5113 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5114 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5115 <para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5116 The following example performs an internal redirect with the new request |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5117 arguments. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5118 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5119 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5120 <programlisting> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5121 ngx_int_t |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5122 ngx_http_foo_redirect(ngx_http_request_t *r) |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5123 { |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5124 ngx_str_t uri, args; |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5125 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5126 ngx_str_set(&uri, "/foo"); |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5127 ngx_str_set(&args, "bar=1"); |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5128 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5129 return ngx_http_internal_redirect(r, &uri, &args); |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5130 } |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5131 </programlisting> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5132 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5133 <para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5134 The function <literal>ngx_http_named_location(r, name)</literal> redirects |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5135 a request to a named location. The name of the location is passed as the |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5136 argument. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5137 The location is looked up among all named locations of the current |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5138 server, after which the requests switches to the |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5139 <literal>NGX_HTTP_REWRITE_PHASE</literal> phase. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5140 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5141 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5142 <para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5143 The following example performs a redirect to a named location @foo. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5144 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5145 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5146 <programlisting> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5147 ngx_int_t |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5148 ngx_http_foo_named_redirect(ngx_http_request_t *r) |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5149 { |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5150 ngx_str_t name; |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5151 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5152 ngx_str_set(&name, "foo"); |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5153 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5154 return ngx_http_named_location(r, &name); |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5155 } |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5156 </programlisting> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5157 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5158 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5159 Both functions - <literal>ngx_http_internal_redirect(r, uri, args)</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5160 and <literal>ngx_http_named_location(r, name)</literal> can be called when |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5161 nginx modules have already stored some contexts in a request's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5162 <literal>ctx</literal> field. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5163 It's possible for these contexts to become inconsistent with the new |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5164 location configuration. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5165 To prevent inconsistency, all request contexts are |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5166 erased by both redirect functions. |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5167 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5168 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5169 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5170 Calling <literal>ngx_http_internal_redirect(r, uri, args)</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5171 or <literal>ngx_http_named_location(r, name)</literal> increases the request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5172 <literal>count</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5173 For consistent request reference counting, call |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5174 <literal>ngx_http_finalize_request(r, NGX_DONE)</literal> after redirecting the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5175 request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5176 This will finalize current request code path and decrease the counter. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5177 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5178 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5179 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5180 Redirected and rewritten requests become internal and can access the |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5181 <link doc="../http/ngx_http_core_module.xml" id="internal">internal</link> |
1993
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5182 locations. |
98b713b0a9fa
Language and style fixes in development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1983
diff
changeset
|
5183 Internal requests have the <literal>internal</literal> flag set. |
1967
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5184 </para> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5185 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5186 </section> |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5187 |
ef27e3ef0c46
The HTTP request redirection section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1960
diff
changeset
|
5188 |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5189 <section name="Subrequests" id="http_subrequests"> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5190 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5191 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5192 Subrequests are primarily used to insert output of one request into another, |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5193 possibly mixed with other data. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5194 A subrequest looks like a normal request, but shares some data with its parent. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5195 In particular, all fields related to client input are shared |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5196 because a subrequest does not receive any other input from the client. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5197 The request field <literal>parent</literal> for a subrequest contains a link |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5198 to its parent request and is NULL for the main request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5199 The field <literal>main</literal> contains a link to the main request in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5200 a group of requests. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5201 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5202 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5203 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5204 A subrequest starts in the <literal>NGX_HTTP_SERVER_REWRITE_PHASE</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5205 phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5206 It passes through the same subsequent phases as a normal request and is |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5207 assigned a location based on its own URI. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5208 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5209 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5210 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5211 The output header in a subrequest is always ignored. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5212 The <literal>ngx_http_postpone_filter</literal> places the subrequest's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5213 output body in the right position relative to other data produced |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5214 by the parent request. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5215 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5216 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5217 <para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5218 Subrequests are related to the concept of active requests. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5219 A request <literal>r</literal> is considered active if |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5220 <literal>c->data == r</literal>, where <literal>c</literal> is the client |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5221 connection object. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5222 At any given point, only the active request in a request group is allowed |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5223 to output its buffers to the client. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5224 An inactive request can still send its output to the filter chain, but it |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5225 does not pass beyond the <literal>ngx_http_postpone_filter</literal> and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5226 remains buffered by that filter until the request becomes active. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5227 Here are some rules of request activation: |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5228 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5229 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5230 <list type="bullet"> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5231 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5232 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5233 Initially, the main request is active. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5234 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5235 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5236 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5237 The first subrequest of an active request becomes active right after creation. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5238 </listitem> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5239 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5240 <listitem> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5241 The <literal>ngx_http_postpone_filter</literal> activates the next request |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5242 in the active request's subrequest list, once all data prior to that request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5243 are sent. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5244 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5245 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5246 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5247 When a request is finalized, its parent is activated. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5248 </listitem> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5249 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5250 </list> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5251 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5252 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5253 Create a subrequest by calling the function |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5254 <literal>ngx_http_subrequest(r, uri, args, psr, ps, flags)</literal>, where |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5255 <literal>r</literal> is the parent request, <literal>uri</literal> and |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5256 <literal>args</literal> are the URI and arguments of the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5257 subrequest, <literal>psr</literal> is the output parameter, which receives the |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5258 newly created subrequest reference, <literal>ps</literal> is a callback object |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5259 for notifying the parent request that the subrequest is being finalized, and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5260 <literal>flags</literal> is bitmask of flags. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5261 The following flags are available: |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5262 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5263 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5264 <list type="bullet"> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5265 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5266 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5267 <literal>NGX_HTTP_SUBREQUEST_IN_MEMORY</literal> - Output is not |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5268 sent to the client, but rather stored in memory. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5269 The flag only affects subrequests which are processed by one of the proxying |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5270 modules. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5271 After a subrequest is finalized its output is available in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5272 a <literal>r->upstream->buffer</literal> of type <literal>ngx_buf_t</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5273 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5274 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5275 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5276 <literal>NGX_HTTP_SUBREQUEST_WAITED</literal> - The subrequest's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5277 <literal>done</literal> flag is set even if the subrequest is not active when |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5278 it is finalized. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5279 This subrequest flag is used by the SSI filter. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5280 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5281 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5282 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5283 <literal>NGX_HTTP_SUBREQUEST_CLONE</literal> - The subrequest is created as a |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5284 clone of its parent. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5285 It is started at the same location and proceeds from the same phase as the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5286 parent request. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5287 </listitem> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5288 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5289 </list> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5290 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5291 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5292 The following example creates a subrequest with the URI |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5293 of <literal>/foo</literal>. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5294 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5295 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5296 <programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5297 ngx_int_t rc; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5298 ngx_str_t uri; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5299 ngx_http_request_t *sr; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5300 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5301 ... |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5302 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5303 ngx_str_set(&uri, "/foo"); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5304 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5305 rc = ngx_http_subrequest(r, &uri, NULL, &sr, NULL, 0); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5306 if (rc == NGX_ERROR) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5307 /* error */ |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5308 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5309 </programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5310 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5311 <para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5312 This example clones the current request and sets a finalization callback for the |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5313 subrequest. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5314 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5315 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5316 <programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5317 ngx_int_t |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5318 ngx_http_foo_clone(ngx_http_request_t *r) |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5319 { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5320 ngx_http_request_t *sr; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5321 ngx_http_post_subrequest_t *ps; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5322 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5323 ps = ngx_palloc(r->pool, sizeof(ngx_http_post_subrequest_t)); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5324 if (ps == NULL) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5325 return NGX_ERROR; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5326 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5327 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5328 ps->handler = ngx_http_foo_subrequest_done; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5329 ps->data = "foo"; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5330 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5331 return ngx_http_subrequest(r, &r->uri, &r->args, &sr, ps, |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5332 NGX_HTTP_SUBREQUEST_CLONE); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5333 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5334 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5335 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5336 ngx_int_t |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5337 ngx_http_foo_subrequest_done(ngx_http_request_t *r, void *data, ngx_int_t rc) |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5338 { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5339 char *msg = (char *) data; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5340 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5341 ngx_log_error(NGX_LOG_INFO, r->connection->log, 0, |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5342 "done subrequest r:%p msg:%s rc:%i", r, msg, rc); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5343 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5344 return rc; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5345 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5346 </programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5347 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5348 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5349 Subrequests are normally created in a body filter, in which case their output |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5350 can be treated like the output from any explicit request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5351 This means that eventually the output of a subrequest is sent to the client, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5352 after all explicit buffers that are passed before subrequest creation and |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5353 before any buffers that are passed after creation. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5354 This ordering is preserved even for large hierarchies of subrequests. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5355 The following example inserts output from a subrequest after all request data |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5356 buffers, but before the final buffer with the <literal>last_buf</literal> flag. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5357 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5358 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5359 <programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5360 ngx_int_t |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5361 ngx_http_foo_body_filter(ngx_http_request_t *r, ngx_chain_t *in) |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5362 { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5363 ngx_int_t rc; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5364 ngx_buf_t *b; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5365 ngx_uint_t last; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5366 ngx_chain_t *cl, out; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5367 ngx_http_request_t *sr; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5368 ngx_http_foo_filter_ctx_t *ctx; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5369 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5370 ctx = ngx_http_get_module_ctx(r, ngx_http_foo_filter_module); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5371 if (ctx == NULL) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5372 return ngx_http_next_body_filter(r, in); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5373 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5374 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5375 last = 0; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5376 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5377 for (cl = in; cl; cl = cl->next) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5378 if (cl->buf->last_buf) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5379 cl->buf->last_buf = 0; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5380 cl->buf->last_in_chain = 1; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5381 cl->buf->sync = 1; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5382 last = 1; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5383 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5384 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5385 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5386 /* Output explicit output buffers */ |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5387 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5388 rc = ngx_http_next_body_filter(r, in); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5389 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5390 if (rc == NGX_ERROR || !last) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5391 return rc; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5392 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5393 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5394 /* |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5395 * Create the subrequest. The output of the subrequest |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5396 * will automatically be sent after all preceding buffers, |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5397 * but before the last_buf buffer passed later in this function. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5398 */ |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5399 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5400 if (ngx_http_subrequest(r, ctx->uri, NULL, &sr, NULL, 0) != NGX_OK) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5401 return NGX_ERROR; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5402 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5403 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5404 ngx_http_set_ctx(r, NULL, ngx_http_foo_filter_module); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5405 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5406 /* Output the final buffer with the last_buf flag */ |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5407 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5408 b = ngx_calloc_buf(r->pool); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5409 if (b == NULL) { |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5410 return NGX_ERROR; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5411 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5412 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5413 b->last_buf = 1; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5414 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5415 out.buf = b; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5416 out.next = NULL; |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5417 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5418 return ngx_http_output_filter(r, &out); |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5419 } |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5420 </programlisting> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5421 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5422 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5423 A subrequest can also be created for other purposes than data output. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5424 For example, the <link doc="../http/ngx_http_auth_request_module.xml"> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5425 ngx_http_auth_request_module</link> module |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5426 creates a subrequest at the <literal>NGX_HTTP_ACCESS_PHASE</literal> phase. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5427 To disable output at this point, the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5428 <literal>header_only</literal> flag is set on the subrequest. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5429 This prevents the subrequest body from being sent to the client. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5430 Note that the subrequest's header is never sent to the client. |
1968
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5431 The result of the subrequest can be analyzed in the callback handler. |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5432 </para> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5433 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5434 </section> |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5435 |
69908bd68481
The HTTP subrequests section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1967
diff
changeset
|
5436 |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5437 <section name="Request finalization" id="http_request_finalization"> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5438 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5439 <para> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5440 An HTTP request is finalized by calling the function |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5441 <literal>ngx_http_finalize_request(r, rc)</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5442 It is usually finalized by the content handler after all output buffers |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5443 are sent to the filter chain. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5444 At this point all of the output might not be sent to the client, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5445 with some of it remaining buffered somewhere along the filter chain. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5446 If it is, the <literal>ngx_http_finalize_request(r, rc)</literal> function |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5447 automatically installs a special handler <literal>ngx_http_writer(r)</literal> |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5448 to finish sending the output. |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5449 A request is also finalized in case of an error or if a standard HTTP response |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5450 code needs to be returned to the client. |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5451 </para> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5452 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5453 <para> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5454 The function <literal>ngx_http_finalize_request(r, rc)</literal> expects the |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5455 following <literal>rc</literal> values: |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5456 </para> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5457 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5458 <list type="bullet"> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5459 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5460 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5461 <literal>NGX_DONE</literal> - Fast finalization. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5462 Decrement the request <literal>count</literal> and destroy the request if it |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5463 reaches zero. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5464 The client connection can be used for more requests after the current request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5465 is destroyed. |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5466 </listitem> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5467 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5468 <listitem> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5469 <literal>NGX_ERROR</literal>, <literal>NGX_HTTP_REQUEST_TIME_OUT</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5470 (<literal>408</literal>), <literal>NGX_HTTP_CLIENT_CLOSED_REQUEST</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5471 (<literal>499</literal>) - Error finalization. |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5472 Terminate the request as soon as possible and close the client connection. |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5473 </listitem> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5474 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5475 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5476 <literal>NGX_HTTP_CREATED</literal> (<literal>201</literal>), |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5477 <literal>NGX_HTTP_NO_CONTENT</literal> (<literal>204</literal>), codes greater |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5478 than or equal to <literal>NGX_HTTP_SPECIAL_RESPONSE</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5479 (<literal>300</literal>) - Special response finalization. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5480 For these values nginx either sends to the client a default response page for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5481 the code or performs the internal redirect to an |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5482 <link doc="../http/ngx_http_core_module.xml" id="error_page"/> location if that |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5483 is configured for the code. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5484 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5485 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5486 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5487 Other codes are considered successful finalization codes and might activate the |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5488 request writer to finish sending the response body. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5489 Once the body is completely sent, the request <literal>count</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5490 is decremented. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5491 If it reaches zero, the request is destroyed, but the client connection can |
1969
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5492 still be used for other requests. |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5493 If <literal>count</literal> is positive, there are unfinished activities |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5494 within the request, which will be finalized at a later point. |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5495 </listitem> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5496 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5497 </list> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5498 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5499 </section> |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5500 |
275c928ab386
The HTTP request finalization section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1968
diff
changeset
|
5501 |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5502 <section name="Request body" id="http_request_body"> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5503 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5504 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5505 For dealing with the body of a client request, nginx provides the |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5506 <literal>ngx_http_read_client_request_body(r, post_handler)</literal> and |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5507 <literal>ngx_http_discard_request_body(r)</literal> functions. |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5508 The first function reads the request body and makes it available via the |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5509 <literal>request_body</literal> request field. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5510 The second function instructs nginx to discard (read and ignore) the request |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5511 body. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5512 One of these functions must be called for every request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5513 Normally, the content handler makes the call. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5514 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5515 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5516 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5517 Reading or discarding the client request body from a subrequest is not allowed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5518 It must always be done in the main request. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5519 When a subrequest is created, it inherits the parent's |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5520 <literal>request_body</literal> object which can be used by the subrequest if |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5521 the main request has previously read the request body. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5522 </para> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5523 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5524 <para> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5525 The function |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5526 <literal>ngx_http_read_client_request_body(r, post_handler)</literal> starts |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5527 the process of reading the request body. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5528 When the body is completely read, the <literal>post_handler</literal> callback |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5529 is called to continue processing the request. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5530 If the request body is missing or has already been read, the callback is called |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5531 immediately. |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5532 The function |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5533 <literal>ngx_http_read_client_request_body(r, post_handler)</literal> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5534 allocates the <literal>request_body</literal> request field of type |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5535 <literal>ngx_http_request_body_t</literal>. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5536 The field <literal>bufs</literal> of this object keeps the result as a buffer |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5537 chain. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5538 The body can be saved in memory buffers or file buffers, if the capacity |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5539 specified by the |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5540 <link doc="../http/ngx_http_core_module.xml" id="client_body_buffer_size"/> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5541 directive is not enough to fit the entire body in memory. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5542 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5543 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5544 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5545 The following example reads a client request body and returns its size. |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5546 </para> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5547 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5548 <programlisting> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5549 ngx_int_t |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5550 ngx_http_foo_content_handler(ngx_http_request_t *r) |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5551 { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5552 ngx_int_t rc; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5553 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5554 rc = ngx_http_read_client_request_body(r, ngx_http_foo_init); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5555 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5556 if (rc >= NGX_HTTP_SPECIAL_RESPONSE) { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5557 /* error */ |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5558 return rc; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5559 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5560 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5561 return NGX_DONE; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5562 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5563 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5564 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5565 void |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5566 ngx_http_foo_init(ngx_http_request_t *r) |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5567 { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5568 off_t len; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5569 ngx_buf_t *b; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5570 ngx_int_t rc; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5571 ngx_chain_t *in, out; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5572 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5573 if (r->request_body == NULL) { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5574 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5575 return; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5576 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5577 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5578 len = 0; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5579 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5580 for (in = r->request_body->bufs; in; in = in->next) { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5581 len += ngx_buf_size(in->buf); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5582 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5583 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5584 b = ngx_create_temp_buf(r->pool, NGX_OFF_T_LEN); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5585 if (b == NULL) { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5586 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5587 return; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5588 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5589 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5590 b->last = ngx_sprintf(b->pos, "%O", len); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5591 b->last_buf = (r == r->main) ? 1: 0; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5592 b->last_in_chain = 1; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5593 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5594 r->headers_out.status = NGX_HTTP_OK; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5595 r->headers_out.content_length_n = b->last - b->pos; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5596 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5597 rc = ngx_http_send_header(r); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5598 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5599 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5600 ngx_http_finalize_request(r, rc); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5601 return; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5602 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5603 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5604 out.buf = b; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5605 out.next = NULL; |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5606 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5607 rc = ngx_http_output_filter(r, &out); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5608 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5609 ngx_http_finalize_request(r, rc); |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5610 } |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5611 </programlisting> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5612 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5613 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5614 The following fields of the request determine how the request body is read: |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5615 </para> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5616 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5617 <list type="bullet"> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5618 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5619 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5620 <literal>request_body_in_single_buf</literal> - Read the body to a single memory |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5621 buffer. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5622 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5623 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5624 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5625 <literal>request_body_in_file_only</literal> - Always read the body to a file, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5626 even if fits in the memory buffer. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5627 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5628 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5629 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5630 <literal>request_body_in_persistent_file</literal> - Do not unlink the file |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5631 immediately after creation. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5632 A file with this flag can be moved to another directory. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5633 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5634 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5635 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5636 <literal>request_body_in_clean_file</literal> - Unlink the file when the |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5637 request is finalized. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5638 This can be useful when a file was supposed to be moved to another directory |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5639 but was not moved for some reason. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5640 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5641 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5642 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5643 <literal>request_body_file_group_access</literal> - Enable group access to the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5644 file by replacing the default 0600 access mask with 0660. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5645 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5646 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5647 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5648 <literal>request_body_file_log_level</literal> - Severity level at which to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5649 log file errors. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5650 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5651 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5652 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5653 <literal>request_body_no_buffering</literal> - Read the request body without |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5654 buffering. |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5655 </listitem> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5656 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5657 </list> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5658 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5659 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5660 The <literal>request_body_no_buffering</literal> flag enables the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5661 unbuffered mode of reading a request body. |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5662 In this mode, after calling |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5663 <literal>ngx_http_read_client_request_body()</literal>, the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5664 <literal>bufs</literal> chain might keep only a part of the body. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5665 To read the next part, call the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5666 <literal>ngx_http_read_unbuffered_request_body(r)</literal> function. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5667 The return value <literal>NGX_AGAIN</literal> and the request flag |
1970
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5668 <literal>reading_body</literal> indicate that more data is available. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5669 If <literal>bufs</literal> is NULL after calling this function, there is |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5670 nothing to read at the moment. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5671 The request callback <literal>read_event_handler</literal> will be called when |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5672 the next part of request body is available. |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5673 </para> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5674 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5675 </section> |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5676 |
a1d29eda04b6
The HTTP request body section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1969
diff
changeset
|
5677 |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5678 <section name="Response" id="http_response"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5679 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5680 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5681 In nginx an HTTP response is produced by sending the response header followed by |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5682 the optional response body. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5683 Both header and body are passed through a chain of filters and eventually get |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5684 written to the client socket. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5685 An nginx module can install its handler into the header or body filter chain |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5686 and process the output coming from the previous handler. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5687 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5688 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5689 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5690 <section name="Response header" id="http_response_header"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5691 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5692 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5693 The <literal>ngx_http_send_header(r)</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5694 function sends the output header. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5695 Do not call this function until <literal>r->headers_out</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5696 contains all of the data required to produce the HTTP response header. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5697 The <literal>status</literal> field in <literal>r->headers_out</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5698 must always be set. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5699 If the response status indicates that a response body follows the header, |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5700 <literal>content_length_n</literal> can be set as well. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5701 The default value for this field is <literal>-1</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5702 which means that the body size is unknown. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5703 In this case, chunked transfer encoding is used. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5704 To output an arbitrary header, append the <literal>headers</literal> list. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5705 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5706 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5707 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5708 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5709 ngx_http_foo_content_handler(ngx_http_request_t *r) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5710 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5711 ngx_int_t rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5712 ngx_table_elt_t *h; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5713 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5714 /* send header */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5715 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5716 r->headers_out.status = NGX_HTTP_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5717 r->headers_out.content_length_n = 3; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5718 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5719 /* X-Foo: foo */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5720 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5721 h = ngx_list_push(&r->headers_out.headers); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5722 if (h == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5723 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5724 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5725 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5726 h->hash = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5727 ngx_str_set(&h->key, "X-Foo"); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5728 ngx_str_set(&h->value, "foo"); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5729 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5730 rc = ngx_http_send_header(r); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5731 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5732 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5733 return rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5734 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5735 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5736 /* send body */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5737 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5738 ... |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5739 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5740 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5741 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5742 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5743 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5744 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5745 <section name="Header filters" id="http_header_filters"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5746 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5747 <para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5748 The <literal>ngx_http_send_header(r)</literal> function invokes the header |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5749 filter chain by calling the first header filter handler stored in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5750 the <literal>ngx_http_top_header_filter</literal> variable. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5751 It's assumed that every header handler calls the next handler in the chain |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5752 until the final handler <literal>ngx_http_header_filter(r)</literal> is called. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5753 The final header handler constructs the HTTP response based on |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5754 <literal>r->headers_out</literal> and passes it to the |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5755 <literal>ngx_http_writer_filter</literal> for output. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5756 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5757 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5758 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5759 To add a handler to the header filter chain, store its address in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5760 the global variable <literal>ngx_http_top_header_filter</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5761 at configuration time. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5762 The previous handler address is normally stored in a static variable in a module |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5763 and is called by the newly added handler before exiting. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5764 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5765 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5766 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5767 The following example of a header filter module adds the HTTP header |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5768 "<literal>X-Foo: foo</literal>" to every response with status |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5769 <literal>200</literal>. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5770 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5771 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5772 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5773 #include <ngx_config.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5774 #include <ngx_core.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5775 #include <ngx_http.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5776 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5777 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5778 static ngx_int_t ngx_http_foo_header_filter(ngx_http_request_t *r); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5779 static ngx_int_t ngx_http_foo_header_filter_init(ngx_conf_t *cf); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5780 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5781 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5782 static ngx_http_module_t ngx_http_foo_header_filter_module_ctx = { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5783 NULL, /* preconfiguration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5784 ngx_http_foo_header_filter_init, /* postconfiguration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5785 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5786 NULL, /* create main configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5787 NULL, /* init main configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5788 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5789 NULL, /* create server configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5790 NULL, /* merge server configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5791 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5792 NULL, /* create location configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5793 NULL /* merge location configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5794 }; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5795 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5796 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5797 ngx_module_t ngx_http_foo_header_filter_module = { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5798 NGX_MODULE_V1, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5799 &ngx_http_foo_header_filter_module_ctx, /* module context */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5800 NULL, /* module directives */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5801 NGX_HTTP_MODULE, /* module type */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5802 NULL, /* init master */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5803 NULL, /* init module */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5804 NULL, /* init process */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5805 NULL, /* init thread */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5806 NULL, /* exit thread */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5807 NULL, /* exit process */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5808 NULL, /* exit master */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5809 NGX_MODULE_V1_PADDING |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5810 }; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5811 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5812 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5813 static ngx_http_output_header_filter_pt ngx_http_next_header_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5814 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5815 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5816 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5817 ngx_http_foo_header_filter(ngx_http_request_t *r) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5818 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5819 ngx_table_elt_t *h; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5820 |
1971
5fb870087b76
Fixed typo and removed trailing spaces.
Vladimir Homutov <vl@nginx.com>
parents:
1970
diff
changeset
|
5821 /* |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5822 * The filter handler adds "X-Foo: foo" header |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5823 * to every HTTP 200 response |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5824 */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5825 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5826 if (r->headers_out.status != NGX_HTTP_OK) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5827 return ngx_http_next_header_filter(r); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5828 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5829 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5830 h = ngx_list_push(&r->headers_out.headers); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5831 if (h == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5832 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5833 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5834 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5835 h->hash = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5836 ngx_str_set(&h->key, "X-Foo"); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5837 ngx_str_set(&h->value, "foo"); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5838 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5839 return ngx_http_next_header_filter(r); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5840 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5841 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5842 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5843 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5844 ngx_http_foo_header_filter_init(ngx_conf_t *cf) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5845 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5846 ngx_http_next_header_filter = ngx_http_top_header_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5847 ngx_http_top_header_filter = ngx_http_foo_header_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5848 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5849 return NGX_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5850 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5851 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5852 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5853 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5854 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5855 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5856 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5857 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5858 <section name="Response body" id="http_response_body"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5859 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5860 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5861 To send the response body, call the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5862 <literal>ngx_http_output_filter(r, cl)</literal> function. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5863 The function can be called multiple times. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5864 Each time, it sends a part of the response body in the form of a buffer chain. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5865 Set the <literal>last_buf</literal> flag in the last body buffer. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5866 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5867 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5868 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5869 The following example produces a complete HTTP response with "foo" as its body. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5870 For the example to work as subrequest as well as a main request, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5871 the <literal>last_in_chain</literal> flag is set in the last buffer |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5872 of the output. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5873 The <literal>last_buf</literal> flag is set only for the main request because |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5874 the last buffer for a subrequest does not end the entire output. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5875 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5876 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5877 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5878 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5879 ngx_http_bar_content_handler(ngx_http_request_t *r) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5880 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5881 ngx_int_t rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5882 ngx_buf_t *b; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5883 ngx_chain_t out; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5884 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5885 /* send header */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5886 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5887 r->headers_out.status = NGX_HTTP_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5888 r->headers_out.content_length_n = 3; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5889 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5890 rc = ngx_http_send_header(r); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5891 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5892 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5893 return rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5894 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5895 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5896 /* send body */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5897 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5898 b = ngx_calloc_buf(r->pool); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5899 if (b == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5900 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5901 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5902 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5903 b->last_buf = (r == r->main) ? 1: 0; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5904 b->last_in_chain = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5905 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5906 b->memory = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5907 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5908 b->pos = (u_char *) "foo"; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5909 b->last = b->pos + 3; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5910 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5911 out.buf = b; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5912 out.next = NULL; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5913 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5914 return ngx_http_output_filter(r, &out); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5915 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5916 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5917 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5918 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5919 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5920 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5921 <section name="Body filters" id="http_body_filters"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5922 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5923 <para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5924 The function <literal>ngx_http_output_filter(r, cl)</literal> invokes the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5925 body filter chain by calling the first body filter handler stored in |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5926 the <literal>ngx_http_top_body_filter</literal> variable. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5927 It's assumed that every body handler calls the next handler in the chain until |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5928 the final handler <literal>ngx_http_write_filter(r, cl)</literal> is called. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5929 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5930 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5931 <para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5932 A body filter handler receives a chain of buffers. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5933 The handler is supposed to process the buffers and pass a possibly new chain to |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5934 the next handler. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5935 It's worth noting that the chain links <literal>ngx_chain_t</literal> of the |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5936 incoming chain belong to the caller, and must not be reused or changed. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5937 Right after the handler completes, the caller can use its output chain links |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5938 to keep track of the buffers it has sent. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5939 To save the buffer chain or to substitute some buffers before passing to the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5940 next filter, a handler needs to allocate its own chain links. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5941 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5942 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5943 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5944 Following is an example of a simple body filter that counts the number of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
5945 bytes in the body. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5946 The result is available as the <literal>$counter</literal> variable which can be |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5947 used in the access log. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5948 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5949 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5950 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5951 #include <ngx_config.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5952 #include <ngx_core.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5953 #include <ngx_http.h> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5954 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5955 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5956 typedef struct { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5957 off_t count; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5958 } ngx_http_counter_filter_ctx_t; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5959 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5960 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5961 static ngx_int_t ngx_http_counter_body_filter(ngx_http_request_t *r, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5962 ngx_chain_t *in); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5963 static ngx_int_t ngx_http_counter_variable(ngx_http_request_t *r, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5964 ngx_http_variable_value_t *v, uintptr_t data); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5965 static ngx_int_t ngx_http_counter_add_variables(ngx_conf_t *cf); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5966 static ngx_int_t ngx_http_counter_filter_init(ngx_conf_t *cf); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5967 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5968 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5969 static ngx_http_module_t ngx_http_counter_filter_module_ctx = { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5970 ngx_http_counter_add_variables, /* preconfiguration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5971 ngx_http_counter_filter_init, /* postconfiguration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5972 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5973 NULL, /* create main configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5974 NULL, /* init main configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5975 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5976 NULL, /* create server configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5977 NULL, /* merge server configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5978 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5979 NULL, /* create location configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5980 NULL /* merge location configuration */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5981 }; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5982 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5983 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5984 ngx_module_t ngx_http_counter_filter_module = { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5985 NGX_MODULE_V1, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5986 &ngx_http_counter_filter_module_ctx, /* module context */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5987 NULL, /* module directives */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5988 NGX_HTTP_MODULE, /* module type */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5989 NULL, /* init master */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5990 NULL, /* init module */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5991 NULL, /* init process */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5992 NULL, /* init thread */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5993 NULL, /* exit thread */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5994 NULL, /* exit process */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5995 NULL, /* exit master */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5996 NGX_MODULE_V1_PADDING |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5997 }; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5998 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
5999 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6000 static ngx_http_output_body_filter_pt ngx_http_next_body_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6001 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6002 static ngx_str_t ngx_http_counter_name = ngx_string("counter"); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6003 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6004 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6005 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6006 ngx_http_counter_body_filter(ngx_http_request_t *r, ngx_chain_t *in) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6007 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6008 ngx_chain_t *cl; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6009 ngx_http_counter_filter_ctx_t *ctx; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6010 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6011 ctx = ngx_http_get_module_ctx(r, ngx_http_counter_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6012 if (ctx == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6013 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_counter_filter_ctx_t)); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6014 if (ctx == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6015 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6016 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6017 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6018 ngx_http_set_ctx(r, ctx, ngx_http_counter_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6019 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6020 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6021 for (cl = in; cl; cl = cl->next) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6022 ctx->count += ngx_buf_size(cl->buf); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6023 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6024 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6025 return ngx_http_next_body_filter(r, in); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6026 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6027 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6028 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6029 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6030 ngx_http_counter_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6031 uintptr_t data) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6032 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6033 u_char *p; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6034 ngx_http_counter_filter_ctx_t *ctx; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6035 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6036 ctx = ngx_http_get_module_ctx(r, ngx_http_counter_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6037 if (ctx == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6038 v->not_found = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6039 return NGX_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6040 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6041 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6042 p = ngx_pnalloc(r->pool, NGX_OFF_T_LEN); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6043 if (p == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6044 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6045 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6046 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6047 v->data = p; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6048 v->len = ngx_sprintf(p, "%O", ctx->count) - p; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6049 v->valid = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6050 v->no_cacheable = 0; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6051 v->not_found = 0; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6052 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6053 return NGX_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6054 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6055 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6056 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6057 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6058 ngx_http_counter_add_variables(ngx_conf_t *cf) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6059 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6060 ngx_http_variable_t *var; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6061 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6062 var = ngx_http_add_variable(cf, &ngx_http_counter_name, 0); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6063 if (var == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6064 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6065 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6066 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6067 var->get_handler = ngx_http_counter_variable; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6068 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6069 return NGX_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6070 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6071 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6072 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6073 static ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6074 ngx_http_counter_filter_init(ngx_conf_t *cf) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6075 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6076 ngx_http_next_body_filter = ngx_http_top_body_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6077 ngx_http_top_body_filter = ngx_http_counter_body_filter; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6078 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6079 return NGX_OK; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6080 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6081 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6082 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6083 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6084 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6085 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6086 <section name="Building filter modules" id="http_building_filter_modules"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6087 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6088 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6089 When writing a body or header filter, pay special attention to the filter's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6090 position in the filter order. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6091 There's a number of header and body filters registered by nginx standard |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6092 modules. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6093 The nginx standard modules register a number of head and body filters and it's |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6094 important to register a new filter module in the right place with respect to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6095 them. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6096 Normally, modules register filters in their postconfiguration handlers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6097 The order in which filters are called during processing is obviously the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6098 reverse of the order in which they are registered. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6099 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6100 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6101 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6102 For third-party filter modules nginx provides a special slot |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6103 <literal>HTTP_AUX_FILTER_MODULES</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6104 To register a filter module in this slot, set |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6105 the <literal>ngx_module_type</literal> variable to |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6106 <literal>HTTP_AUX_FILTER</literal> in the module's configuration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6107 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6108 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6109 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6110 The following example shows a filter module config file assuming |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6111 for a module with just |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6112 one source file, <literal>ngx_http_foo_filter_module.c</literal>. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6113 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6114 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6115 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6116 ngx_module_type=HTTP_AUX_FILTER |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6117 ngx_module_name=ngx_http_foo_filter_module |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6118 ngx_module_srcs="$ngx_addon_dir/ngx_http_foo_filter_module.c" |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6119 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6120 . auto/module |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6121 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6122 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6123 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6124 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6125 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6126 <section name="Buffer reuse" id="http_body_buffers_reuse"> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6127 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6128 <para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6129 When issuing or altering a stream of buffers, it's often desirable to reuse the |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6130 allocated buffers. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6131 A standard and widely adopted approach in nginx code is to keep |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6132 two buffer chains for this purpose: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6133 <literal>free</literal> and <literal>busy</literal>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6134 The <literal>free</literal> chain keeps all free buffers, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6135 which can be reused. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6136 The <literal>busy</literal> chain keeps all buffers sent by the current |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6137 module that are still in use by some other filter handler. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6138 A buffer is considered in use if its size is greater than zero. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6139 Normally, when a buffer is consumed by a filter, its <literal>pos</literal> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6140 (or <literal>file_pos</literal> for a file buffer) is moved towards |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6141 <literal>last</literal> (<literal>file_last</literal> for a file buffer). |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6142 Once a buffer is completely consumed, it's ready to be reused. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6143 To add newly freed buffers to the <literal>free</literal> chain |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6144 it's enough to iterate over the <literal>busy</literal> chain and move the zero |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6145 size buffers at the head of it to <literal>free</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6146 This operation is so common that there is a special function for it, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6147 <literal>ngx_chain_update_chains(free, busy, out, tag)</literal>. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6148 The function appends the output chain <literal>out</literal> to |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6149 <literal>busy</literal> and moves free buffers from the top of |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6150 <literal>busy</literal> to <literal>free</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6151 Only the buffers with the specified <literal>tag</literal> are reused. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6152 This lets a module reuse only the buffers that it allocated itself. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6153 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6154 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6155 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6156 The following example is a body filter that inserts the string “foo” before each |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6157 incoming buffer. |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6158 The new buffers allocated by the module are reused if possible. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6159 Note that for this example to work properly, setting up a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6160 <link id="http_header_filters">header filter</link> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6161 and resetting <literal>content_length_n</literal> to <literal>-1</literal> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6162 is also required, but the relevant code is not provided here. |
1960
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6163 </para> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6164 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6165 <programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6166 typedef struct { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6167 ngx_chain_t *free; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6168 ngx_chain_t *busy; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6169 } ngx_http_foo_filter_ctx_t; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6170 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6171 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6172 ngx_int_t |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6173 ngx_http_foo_body_filter(ngx_http_request_t *r, ngx_chain_t *in) |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6174 { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6175 ngx_int_t rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6176 ngx_buf_t *b; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6177 ngx_chain_t *cl, *tl, *out, **ll; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6178 ngx_http_foo_filter_ctx_t *ctx; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6179 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6180 ctx = ngx_http_get_module_ctx(r, ngx_http_foo_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6181 if (ctx == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6182 ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_foo_filter_ctx_t)); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6183 if (ctx == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6184 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6185 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6186 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6187 ngx_http_set_ctx(r, ctx, ngx_http_foo_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6188 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6189 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6190 /* create a new chain "out" from "in" with all the changes */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6191 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6192 ll = &out; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6193 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6194 for (cl = in; cl; cl = cl->next) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6195 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6196 /* append "foo" in a reused buffer if possible */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6197 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6198 tl = ngx_chain_get_free_buf(r->pool, &ctx->free); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6199 if (tl == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6200 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6201 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6202 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6203 b = tl->buf; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6204 b->tag = (ngx_buf_tag_t) &ngx_http_foo_filter_module; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6205 b->memory = 1; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6206 b->pos = (u_char *) "foo"; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6207 b->last = b->pos + 3; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6208 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6209 *ll = tl; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6210 ll = &tl->next; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6211 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6212 /* append the next incoming buffer */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6213 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6214 tl = ngx_alloc_chain_link(r->pool); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6215 if (tl == NULL) { |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6216 return NGX_ERROR; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6217 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6218 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6219 tl->buf = cl->buf; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6220 *ll = tl; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6221 ll = &tl->next; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6222 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6223 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6224 *ll = NULL; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6225 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6226 /* send the new chain */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6227 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6228 rc = ngx_http_next_body_filter(r, out); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6229 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6230 /* update "busy" and "free" chains for reuse */ |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6231 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6232 ngx_chain_update_chains(r->pool, &ctx->free, &ctx->busy, &out, |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6233 (ngx_buf_tag_t) &ngx_http_foo_filter_module); |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6234 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6235 return rc; |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6236 } |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6237 </programlisting> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6238 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6239 </section> |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6240 |
9550ea66abdd
HTTP response section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1959
diff
changeset
|
6241 |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6242 <section name="Load balancing" id="http_load_balancing"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6243 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6244 <para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6245 The |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6246 <link doc="../http/ngx_http_upstream_module.xml">ngx_http_upstream_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6247 provides the basic functionality needed to pass requests to remote servers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6248 Modules that implement specific protocols, such as HTTP or FastCGI, use |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6249 this functionality. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6250 The module also provides an interface for creating custom |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6251 load-balancing modules and implements a default round-robin method. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6252 </para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6253 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6254 <para> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6255 The <link doc="../http/ngx_http_upstream_module.xml" id="least_conn"/> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6256 and <link doc="../http/ngx_http_upstream_module.xml" id="hash"/> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6257 modules implement alternative load-balancing methods, but |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6258 are actually implemented as extensions of the upstream round-robin |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6259 module and share a lot of code with it, such as the representation |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6260 of a server group. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6261 The <link doc="../http/ngx_http_upstream_module.xml" id="keepalive"/> module |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6262 is an independent module that extends upstream functionality. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6263 </para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6264 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6265 <para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6266 The |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6267 <link doc="../http/ngx_http_upstream_module.xml">ngx_http_upstream_module</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6268 can be configured explicitly by placing the corresponding |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6269 <link doc="../http/ngx_http_upstream_module.xml" id="upstream"/> block into |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6270 the configuration file, or implicitly by using directives |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6271 such as <link doc="../http/ngx_http_proxy_module.xml" id="proxy_pass"/> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6272 that accept a URL that gets evaluated at some point into a list of servers. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6273 The alternative load-balancing methods are available only with an explicit |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6274 upstream configuration. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6275 The upstream module configuration has its own directive context |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6276 <literal>NGX_HTTP_UPS_CONF</literal>. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6277 The structure is defined as follows: |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6278 <programlisting> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6279 struct ngx_http_upstream_srv_conf_s { |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6280 ngx_http_upstream_peer_t peer; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6281 void **srv_conf; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6282 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6283 ngx_array_t *servers; /* ngx_http_upstream_server_t */ |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6284 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6285 ngx_uint_t flags; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6286 ngx_str_t host; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6287 u_char *file_name; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6288 ngx_uint_t line; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6289 in_port_t port; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6290 ngx_uint_t no_port; /* unsigned no_port:1 */ |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6291 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6292 #if (NGX_HTTP_UPSTREAM_ZONE) |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6293 ngx_shm_zone_t *shm_zone; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6294 #endif |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6295 }; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6296 </programlisting> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6297 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6298 <list type="bullet"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6299 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6300 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6301 <literal>srv_conf</literal> — Configuration context of upstream modules. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6302 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6303 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6304 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6305 <literal>servers</literal> — Array of |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6306 <literal>ngx_http_upstream_server_t</literal>, the result of parsing a set of |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6307 <link doc="../http/ngx_http_upstream_module.xml" id="server"/> directives |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6308 in the <literal>upstream</literal> block. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6309 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6310 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6311 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6312 <literal>flags</literal> — Flags that mostly mark which features |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6313 are supported by the load-balancing method. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6314 The features are configured as parameters of |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6315 the <link doc="../http/ngx_http_upstream_module.xml" id="server"/> directive: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6316 |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6317 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6318 <list type="bullet"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6319 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6320 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6321 <literal>NGX_HTTP_UPSTREAM_CREATE</literal> — Distinguishes explicitly |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6322 defined upstreams from those that are automatically created by the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6323 <link doc="../http/ngx_http_proxy_module.xml" id="proxy_pass"/> directive |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6324 and “friends” |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6325 (FastCGI, SCGI, etc.) |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6326 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6327 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6328 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6329 <literal>NGX_HTTP_UPSTREAM_WEIGHT</literal> — The “<literal>weight</literal>” |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6330 parameter is supported |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6331 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6332 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6333 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6334 <literal>NGX_HTTP_UPSTREAM_MAX_FAILS</literal> — The |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6335 “<literal>max_fails</literal>” parameter is supported |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6336 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6337 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6338 <listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6339 <literal>NGX_HTTP_UPSTREAM_FAIL_TIMEOUT</literal> — |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6340 The “<literal>fail_timeout</literal>” parameter is supported |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6341 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6342 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6343 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6344 <literal>NGX_HTTP_UPSTREAM_DOWN</literal> — The “<literal>down</literal>” |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6345 parameter is supported |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6346 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6347 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6348 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6349 <literal>NGX_HTTP_UPSTREAM_BACKUP</literal> — The “<literal>backup</literal>” |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6350 parameter is supported |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6351 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6352 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6353 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6354 <literal>NGX_HTTP_UPSTREAM_MAX_CONNS</literal> — The |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6355 “<literal>max_conns</literal>” parameter is supported |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6356 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6357 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6358 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6359 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6360 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6361 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6362 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6363 <literal>host</literal> — Name of the upstream. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6364 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6365 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6366 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6367 <literal>file_name, line</literal> — Name of the configuration file |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6368 and the line where the <literal>upstream</literal> block is located. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6369 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6370 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6371 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6372 <literal>port</literal> and <literal>no_port</literal> — Not used for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6373 explicitly defined upstream groups. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6374 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6375 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6376 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6377 <literal>shm_zone</literal> — Shared memory zone used by this upstream group, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6378 if any. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6379 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6380 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6381 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6382 <literal>peer</literal> — object that holds generic methods for |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6383 initializing upstream configuration: |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6384 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6385 <programlisting> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6386 typedef struct { |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6387 ngx_http_upstream_init_pt init_upstream; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6388 ngx_http_upstream_init_peer_pt init; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6389 void *data; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6390 } ngx_http_upstream_peer_t; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6391 </programlisting> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6392 A module that implements a load-balancing algorithm must set these |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6393 methods and initialize private <literal>data</literal>. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6394 If <literal>init_upstream</literal> was not initialized during configuration |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6395 parsing, <literal>ngx_http_upstream_module</literal> sets it to the default |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6396 <literal>ngx_http_upstream_init_round_robin</literal> algorithm. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6397 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6398 <list type="bullet"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6399 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6400 <literal>init_upstream(cf, us)</literal> — Configuration-time |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6401 method responsible for initializing a group of servers and |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6402 initializing the <literal>init()</literal> method in case of success. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6403 A typical load-balancing module uses a list of servers in the |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6404 <literal>upstream</literal> block |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6405 to create an efficient data structure that it uses and saves its own |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6406 configuration to the <literal>data</literal> field. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6407 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6408 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6409 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6410 <literal>init(r, us)</literal> — Initializes a per-request |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6411 <literal>ngx_http_upstream_peer_t.peer</literal> structure that is used for |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6412 load balancing (not to be confused with the |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6413 <literal>ngx_http_upstream_srv_conf_t.peer</literal> described above which |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6414 is per-upstream). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6415 It is passed as the <literal>data</literal> argument to all callbacks that |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6416 deal with server selection. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6417 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6418 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6419 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6420 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6421 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6422 </para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6423 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6424 <para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6425 When nginx has to pass a request to another host for processing, it uses |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6426 the configured load-balancing method to obtain an address to connect to. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6427 The method is obtained from the |
1994
effdf0747a05
Development guide: fixed a typo.
Vladimir Homutov <vl@nginx.com>
parents:
1993
diff
changeset
|
6428 <literal>ngx_http_upstream_t.peer</literal> object |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6429 of type <literal>ngx_peer_connection_t</literal>: |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6430 <programlisting> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6431 struct ngx_peer_connection_s { |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6432 ... |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6433 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6434 struct sockaddr *sockaddr; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6435 socklen_t socklen; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6436 ngx_str_t *name; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6437 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6438 ngx_uint_t tries; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6439 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6440 ngx_event_get_peer_pt get; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6441 ngx_event_free_peer_pt free; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6442 ngx_event_notify_peer_pt notify; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6443 void *data; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6444 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6445 #if (NGX_SSL || NGX_COMPAT) |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6446 ngx_event_set_peer_session_pt set_session; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6447 ngx_event_save_peer_session_pt save_session; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6448 #endif |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6449 |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6450 ... |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6451 }; |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6452 </programlisting> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6453 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6454 The structure has the following fields: |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6455 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6456 <list type="bullet"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6457 <listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6458 <literal>sockaddr</literal>, <literal>socklen</literal>, |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6459 <literal>name</literal> — Address of the upstream server to connect to; |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6460 this is the output parameter of a load-balancing method. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6461 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6462 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6463 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6464 <literal>data</literal> — The per-request data of a load-balancing method; |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6465 keeps the state of the selection algorithm and usually includes the link |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6466 to the upstream configuration. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6467 It is passed as an argument to all methods that deal with server selection |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6468 (see <link id="lb_method_get">below</link>). |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6469 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6470 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6471 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6472 <literal>tries</literal> — Allowed |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6473 <link doc="../http/ngx_http_proxy_module.xml" id="proxy_next_upstream_tries">number</link> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6474 of attempts to connect to an upstream server. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6475 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6476 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6477 <listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6478 <literal>get</literal>, <literal>free</literal>, <literal>notify</literal>, |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6479 <literal>set_session</literal>, and <literal>save_session</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6480 - Methods of the load-balancing module, described below. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6481 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6482 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6483 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6484 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6485 </para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6486 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6487 <para> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6488 All methods accept at least two arguments: a peer connection object |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6489 <literal>pc</literal> and the <literal>data</literal> created by |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6490 <literal>ngx_http_upstream_srv_conf_t.peer.init()</literal>. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6491 Note that it might differ from <literal>pc.data</literal> due |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6492 to “chaining” of load-balancing modules. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6493 </para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6494 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6495 <para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6496 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6497 <list type="bullet"> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6498 <listitem id="lb_method_get"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6499 <literal>get(pc, data)</literal> — The method called when the upstream |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6500 module is ready to pass a request to an upstream server and needs to know |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6501 its address. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6502 The method has to fill the <literal>sockaddr</literal>, |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6503 <literal>socklen</literal>, and <literal>name</literal> fields of |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6504 <literal>ngx_peer_connection_t</literal> structure. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6505 The return is one of: |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6506 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6507 <list type="bullet"> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6508 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6509 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6510 <literal>NGX_OK</literal> — Server was selected. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6511 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6512 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6513 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6514 <literal>NGX_ERROR</literal> — Internal error occurred. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6515 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6516 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6517 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6518 <literal>NGX_BUSY</literal> — no servers are currently available. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6519 This can happen due to many reasons, including: the dynamic server group is |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6520 empty, all servers in the group are in the failed state, or |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6521 all servers in the group are already |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6522 handling the maximum number of connections. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6523 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6524 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6525 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6526 <literal>NGX_DONE</literal> — the underlying connection was reused and there |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6527 is no need to create a new connection to the upstream server. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6528 This value is set by the <literal>keepalive</literal> module. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6529 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6530 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6531 <!-- |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6532 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6533 <literal>NGX_ABORT</literal> — the request was queued and the further |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6534 processing of this request should be postponed. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6535 This value is set by the <literal>queue</literal> module. |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6536 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6537 --> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6538 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6539 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6540 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6541 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6542 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6543 <listitem> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6544 <literal>free(pc, data, state)</literal> — The method called when an |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6545 upstream module has finished work with a particular server. |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6546 The <literal>state</literal> argument is the completion status of the upstream |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6547 connection, a bitmask with the following possible values: |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6548 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6549 <list type="bullet"> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6550 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6551 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6552 <literal>NGX_PEER_FAILED</literal> — Attempt was |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6553 <link doc="../http/ngx_http_upstream_module.xml" id="max_fails">unsuccessful</link> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6554 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6555 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6556 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6557 <literal>NGX_PEER_NEXT</literal> — A special case when upstream server |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6558 returns codes <literal>403</literal> or <literal>404</literal>, |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6559 which are not considered a |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6560 <link doc="../http/ngx_http_upstream_module.xml" id="max_fails">failure</link>. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6561 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6562 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6563 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6564 <literal>NGX_PEER_KEEPALIVE</literal> — Currently unused |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6565 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6566 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6567 </list> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6568 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6569 This method also decrements the <literal>tries</literal> counter. |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6570 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6571 </listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6572 |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6573 <listitem> |
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6574 <literal>notify(pc, data, type)</literal> — Currently unused |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6575 in the OSS version. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6576 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6577 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6578 <listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6579 <literal>set_session(pc, data)</literal> and |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6580 <literal>save_session(pc, data)</literal> |
2007
c559be34257b
DevGuide: language and style fixes, second part.
Roman Arutyunyan <arut@nginx.com>
parents:
1999
diff
changeset
|
6581 — SSL-specific methods that enable caching sessions to upstream |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6582 servers. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6583 The implementation is provided by the round-robin balancing method. |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6584 </listitem> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6585 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6586 </list> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6587 |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6588 </para> |
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6589 |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
6590 </section> |
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
6591 |
1939
c1b0169e8f54
Added the "Load balancing" section of the development guide.
Vladimir Homutov <vl@nginx.com>
parents:
1936
diff
changeset
|
6592 </section> |
1929
7f290929b32d
HTTP section of the development guide.
Roman Arutyunyan <arut@nginx.com>
parents:
1928
diff
changeset
|
6593 |
1899 | 6594 </article> |