Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_zone_module.c @ 1002:cdde2d4ea5d8
fix connection counter in subrequests
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Tue, 09 Jan 2007 20:58:41 +0000 |
| parents | 778e7d9a92d6 |
| children | 19118c44303f |
| rev | line source |
|---|---|
| 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->main->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->main->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 | |
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250 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 251 { |
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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 |
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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, |
| 1001 | 263 "limit_zone \"%V\" uses 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 } |