Mercurial > hg > nginx
annotate src/http/modules/ngx_http_split_clients_module.c @ 5926:08bfc7188a41
Write filter: fixed handling of sync bufs (ticket #132).
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Fri, 28 Nov 2014 16:58:39 +0300 |
parents | b78cf2414fda |
children |
rev | line source |
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3513 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
3513 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
13 typedef struct { | |
14 uint32_t percent; | |
15 ngx_http_variable_value_t value; | |
16 } ngx_http_split_clients_part_t; | |
17 | |
18 | |
19 typedef struct { | |
20 ngx_http_complex_value_t value; | |
21 ngx_array_t parts; | |
22 } ngx_http_split_clients_ctx_t; | |
23 | |
24 | |
25 static char *ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, | |
26 void *conf); | |
27 static char *ngx_http_split_clients(ngx_conf_t *cf, ngx_command_t *dummy, | |
28 void *conf); | |
29 | |
30 static ngx_command_t ngx_http_split_clients_commands[] = { | |
31 | |
32 { ngx_string("split_clients"), | |
33 NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2, | |
34 ngx_conf_split_clients_block, | |
35 NGX_HTTP_MAIN_CONF_OFFSET, | |
36 0, | |
37 NULL }, | |
38 | |
39 ngx_null_command | |
40 }; | |
41 | |
42 | |
43 static ngx_http_module_t ngx_http_split_clients_module_ctx = { | |
44 NULL, /* preconfiguration */ | |
45 NULL, /* postconfiguration */ | |
46 | |
47 NULL, /* create main configuration */ | |
48 NULL, /* init main configuration */ | |
49 | |
50 NULL, /* create server configuration */ | |
51 NULL, /* merge server configuration */ | |
52 | |
53 NULL, /* create location configuration */ | |
54 NULL /* merge location configuration */ | |
55 }; | |
56 | |
57 | |
58 ngx_module_t ngx_http_split_clients_module = { | |
59 NGX_MODULE_V1, | |
60 &ngx_http_split_clients_module_ctx, /* module context */ | |
61 ngx_http_split_clients_commands, /* module directives */ | |
62 NGX_HTTP_MODULE, /* module type */ | |
63 NULL, /* init master */ | |
64 NULL, /* init module */ | |
65 NULL, /* init process */ | |
66 NULL, /* init thread */ | |
67 NULL, /* exit thread */ | |
68 NULL, /* exit process */ | |
69 NULL, /* exit master */ | |
70 NGX_MODULE_V1_PADDING | |
71 }; | |
72 | |
73 | |
74 static ngx_int_t | |
75 ngx_http_split_clients_variable(ngx_http_request_t *r, | |
76 ngx_http_variable_value_t *v, uintptr_t data) | |
77 { | |
78 ngx_http_split_clients_ctx_t *ctx = (ngx_http_split_clients_ctx_t *) data; | |
79 | |
80 uint32_t hash; | |
81 ngx_str_t val; | |
82 ngx_uint_t i; | |
83 ngx_http_split_clients_part_t *part; | |
84 | |
85 *v = ngx_http_variable_null_value; | |
86 | |
87 if (ngx_http_complex_value(r, &ctx->value, &val) != NGX_OK) { | |
88 return NGX_OK; | |
89 } | |
90 | |
3892
12d8d2f30205
use MurmurHash2 for split_clients, because
Igor Sysoev <igor@sysoev.ru>
parents:
3607
diff
changeset
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91 hash = ngx_murmur_hash2(val.data, val.len); |
3513 | 92 |
93 part = ctx->parts.elts; | |
94 | |
95 for (i = 0; i < ctx->parts.nelts; i++) { | |
96 | |
97 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
3918 | 98 "http split: %uD %uD", hash, part[i].percent); |
3513 | 99 |
4561
ae63013cbffa
Fixed calculation of range boundaries.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
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100 if (hash < part[i].percent || part[i].percent == 0) { |
3513 | 101 *v = part[i].value; |
102 return NGX_OK; | |
103 } | |
104 } | |
105 | |
106 return NGX_OK; | |
107 } | |
108 | |
109 | |
110 static char * | |
111 ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
112 { | |
113 char *rv; | |
4561
ae63013cbffa
Fixed calculation of range boundaries.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
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114 uint32_t sum, last; |
3513 | 115 ngx_str_t *value, name; |
4561
ae63013cbffa
Fixed calculation of range boundaries.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
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116 ngx_uint_t i; |
3513 | 117 ngx_conf_t save; |
118 ngx_http_variable_t *var; | |
119 ngx_http_split_clients_ctx_t *ctx; | |
120 ngx_http_split_clients_part_t *part; | |
121 ngx_http_compile_complex_value_t ccv; | |
122 | |
123 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_split_clients_ctx_t)); | |
124 if (ctx == NULL) { | |
125 return NGX_CONF_ERROR; | |
126 } | |
127 | |
128 value = cf->args->elts; | |
129 | |
130 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); | |
131 | |
132 ccv.cf = cf; | |
133 ccv.value = &value[1]; | |
134 ccv.complex_value = &ctx->value; | |
135 | |
136 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { | |
137 return NGX_CONF_ERROR; | |
138 } | |
139 | |
140 name = value[2]; | |
4635
9c9fbdbe9383
Added syntax checking of the second parameter of the "split_clients" directive.
Ruslan Ermilov <ru@nginx.com>
parents:
4593
diff
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141 |
4972
8b635cf36ccc
Added checks that disallow adding a variable with an empty name.
Ruslan Ermilov <ru@nginx.com>
parents:
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142 if (name.data[0] != '$') { |
4635
9c9fbdbe9383
Added syntax checking of the second parameter of the "split_clients" directive.
Ruslan Ermilov <ru@nginx.com>
parents:
4593
diff
changeset
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143 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
9c9fbdbe9383
Added syntax checking of the second parameter of the "split_clients" directive.
Ruslan Ermilov <ru@nginx.com>
parents:
4593
diff
changeset
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144 "invalid variable name \"%V\"", &name); |
9c9fbdbe9383
Added syntax checking of the second parameter of the "split_clients" directive.
Ruslan Ermilov <ru@nginx.com>
parents:
4593
diff
changeset
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145 return NGX_CONF_ERROR; |
9c9fbdbe9383
Added syntax checking of the second parameter of the "split_clients" directive.
Ruslan Ermilov <ru@nginx.com>
parents:
4593
diff
changeset
|
146 } |
9c9fbdbe9383
Added syntax checking of the second parameter of the "split_clients" directive.
Ruslan Ermilov <ru@nginx.com>
parents:
4593
diff
changeset
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147 |
3513 | 148 name.len--; |
149 name.data++; | |
150 | |
151 var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGEABLE); | |
152 if (var == NULL) { | |
153 return NGX_CONF_ERROR; | |
154 } | |
155 | |
156 var->get_handler = ngx_http_split_clients_variable; | |
157 var->data = (uintptr_t) ctx; | |
158 | |
159 if (ngx_array_init(&ctx->parts, cf->pool, 2, | |
160 sizeof(ngx_http_split_clients_part_t)) | |
161 != NGX_OK) | |
162 { | |
163 return NGX_CONF_ERROR; | |
164 } | |
165 | |
166 save = *cf; | |
167 cf->ctx = ctx; | |
168 cf->handler = ngx_http_split_clients; | |
169 cf->handler_conf = conf; | |
170 | |
171 rv = ngx_conf_parse(cf, NULL); | |
172 | |
173 *cf = save; | |
174 | |
3607
8bff43217171
do not try to calculate procent sum if there was an error
Igor Sysoev <igor@sysoev.ru>
parents:
3513
diff
changeset
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175 if (rv != NGX_CONF_OK) { |
8bff43217171
do not try to calculate procent sum if there was an error
Igor Sysoev <igor@sysoev.ru>
parents:
3513
diff
changeset
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176 return rv; |
8bff43217171
do not try to calculate procent sum if there was an error
Igor Sysoev <igor@sysoev.ru>
parents:
3513
diff
changeset
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177 } |
8bff43217171
do not try to calculate procent sum if there was an error
Igor Sysoev <igor@sysoev.ru>
parents:
3513
diff
changeset
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178 |
3513 | 179 sum = 0; |
180 last = 0; | |
181 part = ctx->parts.elts; | |
182 | |
183 for (i = 0; i < ctx->parts.nelts; i++) { | |
184 sum = part[i].percent ? sum + part[i].percent : 10000; | |
185 if (sum > 10000) { | |
4561
ae63013cbffa
Fixed calculation of range boundaries.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
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186 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
4593
834049edae24
Fixed grammar in error messages.
Ruslan Ermilov <ru@nginx.com>
parents:
4561
diff
changeset
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187 "percent total is greater than 100%%"); |
4561
ae63013cbffa
Fixed calculation of range boundaries.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
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188 return NGX_CONF_ERROR; |
3513 | 189 } |
190 | |
191 if (part[i].percent) { | |
4561
ae63013cbffa
Fixed calculation of range boundaries.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
|
192 last += part[i].percent * (uint64_t) 0xffffffff / 10000; |
ae63013cbffa
Fixed calculation of range boundaries.
Ruslan Ermilov <ru@nginx.com>
parents:
4412
diff
changeset
|
193 part[i].percent = last; |
3513 | 194 } |
195 } | |
196 | |
197 return rv; | |
198 } | |
199 | |
200 | |
201 static char * | |
202 ngx_http_split_clients(ngx_conf_t *cf, ngx_command_t *dummy, void *conf) | |
203 { | |
204 ngx_int_t n; | |
205 ngx_str_t *value; | |
206 ngx_http_split_clients_ctx_t *ctx; | |
207 ngx_http_split_clients_part_t *part; | |
208 | |
209 ctx = cf->ctx; | |
210 value = cf->args->elts; | |
211 | |
212 part = ngx_array_push(&ctx->parts); | |
213 if (part == NULL) { | |
214 return NGX_CONF_ERROR; | |
215 } | |
216 | |
217 if (value[0].len == 1 && value[0].data[0] == '*') { | |
218 part->percent = 0; | |
219 | |
220 } else { | |
5128
b78cf2414fda
Split clients: check length when parsing configuration.
Ruslan Ermilov <ru@nginx.com>
parents:
4972
diff
changeset
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221 if (value[0].len == 0 || value[0].data[value[0].len - 1] != '%') { |
3513 | 222 goto invalid; |
223 } | |
224 | |
225 n = ngx_atofp(value[0].data, value[0].len - 1, 2); | |
226 if (n == NGX_ERROR || n == 0) { | |
227 goto invalid; | |
228 } | |
229 | |
230 part->percent = (uint32_t) n; | |
231 } | |
232 | |
233 part->value.len = value[1].len; | |
234 part->value.valid = 1; | |
235 part->value.no_cacheable = 0; | |
236 part->value.not_found = 0; | |
237 part->value.data = value[1].data; | |
238 | |
239 return NGX_CONF_OK; | |
240 | |
241 invalid: | |
242 | |
243 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
244 "invalid percent value \"%V\"", &value[0]); | |
245 return NGX_CONF_ERROR; | |
246 } |