Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_zone_module.c @ 993:1b9a4d92173f
pass the inherited shm_zone data
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Tue, 09 Jan 2007 15:59:20 +0000 |
parents | 14e68f471d02 |
children | 5900ec20604a |
rev | line source |
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980 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_http.h> | |
10 | |
11 | |
12 typedef struct { | |
981 | 13 u_char color; |
14 u_char len; | |
980 | 15 u_short conn; |
16 u_char data[1]; | |
17 } ngx_http_limit_zone_node_t; | |
18 | |
19 | |
20 typedef struct { | |
21 ngx_shm_zone_t *shm_zone; | |
22 ngx_rbtree_node_t *node; | |
23 } ngx_http_limit_zone_cleanup_t; | |
24 | |
25 | |
26 typedef struct { | |
987 | 27 ngx_rbtree_t *rbtree; |
28 ngx_int_t index; | |
29 ngx_str_t var; | |
30 } ngx_http_limit_zone_ctx_t; | |
31 | |
32 | |
33 typedef struct { | |
980 | 34 ngx_shm_zone_t *shm_zone; |
35 ngx_uint_t conn; | |
36 } ngx_http_limit_zone_conf_t; | |
37 | |
38 | |
39 static void ngx_http_limit_zone_cleanup(void *data); | |
40 | |
41 static void *ngx_http_limit_zone_create_conf(ngx_conf_t *cf); | |
42 static char *ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, | |
43 void *child); | |
44 static char *ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, | |
45 void *conf); | |
46 static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, | |
47 void *conf); | |
48 static ngx_int_t ngx_http_limit_zone_init(ngx_conf_t *cf); | |
49 | |
50 | |
51 static ngx_command_t ngx_http_limit_zone_commands[] = { | |
52 | |
53 { ngx_string("limit_zone"), | |
987 | 54 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
980 | 55 ngx_http_limit_zone, |
56 0, | |
57 0, | |
58 NULL }, | |
59 | |
60 { ngx_string("limit_conn"), | |
987 | 61 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, |
980 | 62 ngx_http_limit_conn, |
63 NGX_HTTP_LOC_CONF_OFFSET, | |
64 0, | |
65 NULL }, | |
66 | |
67 ngx_null_command | |
68 }; | |
69 | |
70 | |
71 static ngx_http_module_t ngx_http_limit_zone_module_ctx = { | |
72 NULL, /* preconfiguration */ | |
73 ngx_http_limit_zone_init, /* postconfiguration */ | |
74 | |
75 NULL, /* create main configuration */ | |
76 NULL, /* init main configuration */ | |
77 | |
78 NULL, /* create server configuration */ | |
79 NULL, /* merge server configuration */ | |
80 | |
81 ngx_http_limit_zone_create_conf, /* create location configration */ | |
82 ngx_http_limit_zone_merge_conf /* merge location configration */ | |
83 }; | |
84 | |
85 | |
86 ngx_module_t ngx_http_limit_zone_module = { | |
87 NGX_MODULE_V1, | |
88 &ngx_http_limit_zone_module_ctx, /* module context */ | |
89 ngx_http_limit_zone_commands, /* module directives */ | |
90 NGX_HTTP_MODULE, /* module type */ | |
91 NULL, /* init master */ | |
92 NULL, /* init module */ | |
93 NULL, /* init process */ | |
94 NULL, /* init thread */ | |
95 NULL, /* exit thread */ | |
96 NULL, /* exit process */ | |
97 NULL, /* exit master */ | |
98 NGX_MODULE_V1_PADDING | |
99 }; | |
100 | |
101 | |
102 static ngx_int_t | |
103 ngx_http_limit_zone_handler(ngx_http_request_t *r) | |
104 { | |
105 size_t len, n; | |
106 uint32_t hash; | |
107 ngx_slab_pool_t *shpool; | |
108 ngx_rbtree_node_t *node, *sentinel; | |
109 ngx_pool_cleanup_t *cln; | |
110 ngx_http_variable_value_t *vv; | |
987 | 111 ngx_http_limit_zone_ctx_t *ctx; |
980 | 112 ngx_http_limit_zone_node_t *lz; |
113 ngx_http_limit_zone_conf_t *lzcf; | |
114 ngx_http_limit_zone_cleanup_t *lzcln; | |
115 | |
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116 if (r->limit_zone_set) { |
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117 return NGX_DECLINED; |
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118 } |
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119 |
980 | 120 lzcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_zone_module); |
121 | |
122 if (lzcf->shm_zone == NULL) { | |
123 return NGX_DECLINED; | |
124 } | |
125 | |
987 | 126 ctx = lzcf->shm_zone->data; |
127 | |
128 vv = ngx_http_get_indexed_variable(r, ctx->index); | |
980 | 129 |
130 if (vv == NULL || vv->not_found) { | |
131 return NGX_DECLINED; | |
132 } | |
133 | |
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134 r->limit_zone_set = 1; |
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135 |
980 | 136 len = vv->len; |
137 | |
138 hash = ngx_crc32_short(vv->data, len); | |
139 | |
140 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_limit_zone_cleanup_t)); | |
141 if (cln == NULL) { | |
142 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
143 } | |
144 | |
145 shpool = (ngx_slab_pool_t *) lzcf->shm_zone->shm.addr; | |
146 | |
147 ngx_shmtx_lock(&shpool->mutex); | |
148 | |
987 | 149 node = ctx->rbtree->root; |
150 sentinel = ctx->rbtree->sentinel; | |
980 | 151 |
152 while (node != sentinel) { | |
153 | |
154 if (hash < node->key) { | |
155 node = node->left; | |
156 continue; | |
157 } | |
158 | |
159 if (hash > node->key) { | |
160 node = node->right; | |
161 continue; | |
162 } | |
163 | |
164 if (hash == node->key ){ | |
981 | 165 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 166 |
167 if (len == (size_t) lz->len | |
168 && ngx_strncmp(lz->data, vv->data, len) == 0) | |
169 { | |
981 | 170 if ((ngx_uint_t) lz->conn < lzcf->conn) { |
980 | 171 lz->conn++; |
172 goto done; | |
173 } | |
174 | |
175 ngx_shmtx_unlock(&shpool->mutex); | |
176 | |
177 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
178 } | |
179 } | |
180 } | |
181 | |
981 | 182 n = offsetof(ngx_rbtree_node_t, color) |
980 | 183 + offsetof(ngx_http_limit_zone_node_t, data) |
184 + len; | |
185 | |
186 node = ngx_slab_alloc_locked(shpool, n); | |
187 if (node == NULL) { | |
188 ngx_shmtx_unlock(&shpool->mutex); | |
189 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
190 } | |
191 | |
981 | 192 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 193 |
194 node->key = hash; | |
981 | 195 lz->len = (u_char) len; |
980 | 196 lz->conn = 1; |
197 ngx_memcpy(lz->data, vv->data, len); | |
198 | |
987 | 199 ngx_rbtree_insert(ctx->rbtree, node); |
980 | 200 |
201 done: | |
202 | |
203 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
204 "limit zone: %08XD %d", node->key, lz->conn); | |
205 | |
206 ngx_shmtx_unlock(&shpool->mutex); | |
207 | |
208 cln->handler = ngx_http_limit_zone_cleanup; | |
209 lzcln = cln->data; | |
210 | |
211 lzcln->shm_zone = lzcf->shm_zone; | |
212 lzcln->node = node; | |
213 | |
214 return NGX_DECLINED; | |
215 } | |
216 | |
217 | |
218 static void | |
219 ngx_http_limit_zone_cleanup(void *data) | |
220 { | |
221 ngx_http_limit_zone_cleanup_t *lzcln = data; | |
222 | |
223 ngx_slab_pool_t *shpool; | |
224 ngx_rbtree_node_t *node; | |
987 | 225 ngx_http_limit_zone_ctx_t *ctx; |
980 | 226 ngx_http_limit_zone_node_t *lz; |
227 | |
987 | 228 ctx = lzcln->shm_zone->data; |
980 | 229 shpool = (ngx_slab_pool_t *) lzcln->shm_zone->shm.addr; |
230 node = lzcln->node; | |
981 | 231 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 232 |
233 ngx_shmtx_lock(&shpool->mutex); | |
234 | |
235 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lzcln->shm_zone->shm.log, 0, | |
236 "limit zone cleanup: %08XD %d", node->key, lz->conn); | |
237 | |
238 lz->conn--; | |
239 | |
240 if (lz->conn == 0) { | |
987 | 241 ngx_rbtree_delete(ctx->rbtree, node); |
980 | 242 ngx_slab_free_locked(shpool, node); |
243 } | |
244 | |
245 ngx_shmtx_unlock(&shpool->mutex); | |
246 } | |
247 | |
248 | |
249 static ngx_int_t | |
993
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250 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 251 { |
993
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252 ngx_http_limit_zone_ctx_t *octx = data; |
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253 |
987 | 254 ngx_slab_pool_t *shpool; |
255 ngx_rbtree_node_t *sentinel; | |
256 ngx_http_limit_zone_ctx_t *ctx; | |
980 | 257 |
993
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258 ctx = shm_zone->data; |
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259 |
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260 if (octx) { |
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261 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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262 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
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263 "limit_zone \"%V\" use the \"%V\" variable " |
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264 "while previously it used the \"%V\" variable", |
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265 &shm_zone->name, &ctx->var, &octx->var); |
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266 return NGX_ERROR; |
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267 } |
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268 |
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269 ctx->rbtree = octx->rbtree; |
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270 |
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271 return NGX_OK; |
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272 } |
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273 |
980 | 274 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
275 | |
987 | 276 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); |
277 if (ctx->rbtree == NULL) { | |
980 | 278 return NGX_ERROR; |
279 } | |
280 | |
281 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); | |
282 if (sentinel == NULL) { | |
283 return NGX_ERROR; | |
284 } | |
285 | |
286 ngx_rbtree_sentinel_init(sentinel); | |
287 | |
987 | 288 ctx->rbtree->root = sentinel; |
289 ctx->rbtree->sentinel = sentinel; | |
290 ctx->rbtree->insert = ngx_rbtree_insert_value; | |
980 | 291 |
292 return NGX_OK; | |
293 } | |
294 | |
295 | |
296 static void * | |
297 ngx_http_limit_zone_create_conf(ngx_conf_t *cf) | |
298 { | |
299 ngx_http_limit_zone_conf_t *conf; | |
300 | |
301 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t)); | |
302 if (conf == NULL) { | |
303 return NGX_CONF_ERROR; | |
304 } | |
305 | |
306 /* | |
307 * set by ngx_pcalloc(): | |
308 * | |
309 * conf->shm_zone = NULL; | |
310 * conf->conn = 0; | |
311 */ | |
312 | |
313 return conf; | |
314 } | |
315 | |
316 | |
317 static char * | |
318 ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
319 { | |
320 ngx_http_limit_zone_conf_t *prev = parent; | |
321 ngx_http_limit_zone_conf_t *conf = child; | |
322 | |
323 if (conf->shm_zone == NULL) { | |
324 *conf = *prev; | |
325 } | |
326 | |
327 return NGX_CONF_OK; | |
328 } | |
329 | |
330 | |
331 static char * | |
332 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
333 { | |
987 | 334 ssize_t n; |
335 ngx_str_t *value; | |
336 ngx_shm_zone_t *shm_zone; | |
337 ngx_http_limit_zone_ctx_t *ctx; | |
980 | 338 |
339 value = cf->args->elts; | |
340 | |
987 | 341 if (value[2].data[0] != '$') { |
342 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
343 "invalid variable name \"%V\"", &value[2]); | |
344 return NGX_CONF_ERROR; | |
345 } | |
346 | |
347 value[2].len--; | |
348 value[2].data++; | |
349 | |
350 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t)); | |
351 if (ctx == NULL) { | |
352 return NGX_CONF_ERROR; | |
353 } | |
354 | |
355 ctx->index = ngx_http_get_variable_index(cf, &value[2]); | |
356 if (ctx->index == NGX_ERROR) { | |
357 return NGX_CONF_ERROR; | |
358 } | |
359 | |
360 ctx->var = value[2]; | |
361 | |
362 n = ngx_parse_size(&value[3]); | |
980 | 363 |
364 if (n == NGX_ERROR) { | |
365 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
987 | 366 "invalid size of limit_zone \"%V\"", &value[3]); |
980 | 367 return NGX_CONF_ERROR; |
368 } | |
369 | |
370 if (n < (ngx_int_t) (8 * ngx_pagesize)) { | |
371 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
372 "limit_zone \"%V\" is too small", &value[1]); | |
373 return NGX_CONF_ERROR; | |
374 } | |
375 | |
376 | |
377 shm_zone = ngx_shared_memory_add(cf, &value[1], n, | |
378 &ngx_http_limit_zone_module); | |
379 if (shm_zone == NULL) { | |
380 return NGX_CONF_ERROR; | |
381 } | |
382 | |
987 | 383 if (shm_zone->data) { |
384 ctx = shm_zone->data; | |
385 | |
386 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
387 "limit_zone \"%V\" is already bound to variable \"%V\"", | |
388 &value[1], &ctx->var); | |
389 return NGX_CONF_ERROR; | |
390 } | |
391 | |
980 | 392 shm_zone->init = ngx_http_limit_zone_init_zone; |
987 | 393 shm_zone->data = ctx; |
980 | 394 |
395 return NGX_CONF_OK; | |
396 } | |
397 | |
398 | |
399 static char * | |
400 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
401 { | |
402 ngx_http_limit_zone_conf_t *lzcf = conf; | |
403 | |
404 ngx_int_t n; | |
405 ngx_str_t *value; | |
406 | |
407 value = cf->args->elts; | |
408 | |
987 | 409 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[1], 0, |
410 &ngx_http_limit_zone_module); | |
411 if (lzcf->shm_zone == NULL) { | |
980 | 412 return NGX_CONF_ERROR; |
413 } | |
414 | |
987 | 415 n = ngx_atoi(value[2].data, value[2].len); |
416 if (n <= 0) { | |
980 | 417 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
987 | 418 "invalid number of connections \"%V\"", &value[2]); |
980 | 419 return NGX_CONF_ERROR; |
420 } | |
421 | |
422 lzcf->conn = n; | |
423 | |
424 return NGX_CONF_OK; | |
425 } | |
426 | |
427 | |
428 static ngx_int_t | |
429 ngx_http_limit_zone_init(ngx_conf_t *cf) | |
430 { | |
431 ngx_http_handler_pt *h; | |
432 ngx_http_core_main_conf_t *cmcf; | |
433 | |
434 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
435 | |
436 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
437 if (h == NULL) { | |
438 return NGX_ERROR; | |
439 } | |
440 | |
441 *h = ngx_http_limit_zone_handler; | |
442 | |
443 return NGX_OK; | |
444 } |