Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_zone_module.c @ 984:dd128232e6ba
count connection once per request
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Sun, 07 Jan 2007 17:47:17 +0000 |
| parents | 6fe76f377a62 |
| children | 14e68f471d02 |
| 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 { | |
| 27 ngx_shm_zone_t *shm_zone; | |
| 28 ngx_int_t index; | |
| 29 ngx_uint_t conn; | |
| 30 } ngx_http_limit_zone_conf_t; | |
| 31 | |
| 32 | |
| 33 static void ngx_http_limit_zone_cleanup(void *data); | |
| 34 | |
| 35 static void *ngx_http_limit_zone_create_conf(ngx_conf_t *cf); | |
| 36 static char *ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, | |
| 37 void *child); | |
| 38 static char *ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 39 void *conf); | |
| 40 static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, | |
| 41 void *conf); | |
| 42 static ngx_int_t ngx_http_limit_zone_init(ngx_conf_t *cf); | |
| 43 | |
| 44 | |
| 45 static ngx_command_t ngx_http_limit_zone_commands[] = { | |
| 46 | |
| 47 { ngx_string("limit_zone"), | |
| 48 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE2, | |
| 49 ngx_http_limit_zone, | |
| 50 0, | |
| 51 0, | |
| 52 NULL }, | |
| 53 | |
| 54 { ngx_string("limit_conn"), | |
| 55 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE3, | |
| 56 ngx_http_limit_conn, | |
| 57 NGX_HTTP_LOC_CONF_OFFSET, | |
| 58 0, | |
| 59 NULL }, | |
| 60 | |
| 61 ngx_null_command | |
| 62 }; | |
| 63 | |
| 64 | |
| 65 static ngx_http_module_t ngx_http_limit_zone_module_ctx = { | |
| 66 NULL, /* preconfiguration */ | |
| 67 ngx_http_limit_zone_init, /* postconfiguration */ | |
| 68 | |
| 69 NULL, /* create main configuration */ | |
| 70 NULL, /* init main configuration */ | |
| 71 | |
| 72 NULL, /* create server configuration */ | |
| 73 NULL, /* merge server configuration */ | |
| 74 | |
| 75 ngx_http_limit_zone_create_conf, /* create location configration */ | |
| 76 ngx_http_limit_zone_merge_conf /* merge location configration */ | |
| 77 }; | |
| 78 | |
| 79 | |
| 80 ngx_module_t ngx_http_limit_zone_module = { | |
| 81 NGX_MODULE_V1, | |
| 82 &ngx_http_limit_zone_module_ctx, /* module context */ | |
| 83 ngx_http_limit_zone_commands, /* module directives */ | |
| 84 NGX_HTTP_MODULE, /* module type */ | |
| 85 NULL, /* init master */ | |
| 86 NULL, /* init module */ | |
| 87 NULL, /* init process */ | |
| 88 NULL, /* init thread */ | |
| 89 NULL, /* exit thread */ | |
| 90 NULL, /* exit process */ | |
| 91 NULL, /* exit master */ | |
| 92 NGX_MODULE_V1_PADDING | |
| 93 }; | |
| 94 | |
| 95 | |
| 96 static ngx_int_t | |
| 97 ngx_http_limit_zone_handler(ngx_http_request_t *r) | |
| 98 { | |
| 99 size_t len, n; | |
| 100 uint32_t hash; | |
| 101 ngx_rbtree_t *rbtree; | |
| 102 ngx_slab_pool_t *shpool; | |
| 103 ngx_rbtree_node_t *node, *sentinel; | |
| 104 ngx_pool_cleanup_t *cln; | |
| 105 ngx_http_variable_value_t *vv; | |
| 106 ngx_http_limit_zone_node_t *lz; | |
| 107 ngx_http_limit_zone_conf_t *lzcf; | |
| 108 ngx_http_limit_zone_cleanup_t *lzcln; | |
| 109 | |
|
984
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
110 if (r->limit_zone_set) { |
|
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
111 return NGX_DECLINED; |
|
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
112 } |
|
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
113 |
| 980 | 114 lzcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_zone_module); |
| 115 | |
| 116 if (lzcf->shm_zone == NULL) { | |
| 117 return NGX_DECLINED; | |
| 118 } | |
| 119 | |
| 120 vv = ngx_http_get_indexed_variable(r, lzcf->index); | |
| 121 | |
| 122 if (vv == NULL || vv->not_found) { | |
| 123 return NGX_DECLINED; | |
| 124 } | |
| 125 | |
|
984
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
126 r->limit_zone_set = 1; |
|
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
127 |
| 980 | 128 len = vv->len; |
| 129 | |
| 130 hash = ngx_crc32_short(vv->data, len); | |
| 131 | |
| 132 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_limit_zone_cleanup_t)); | |
| 133 if (cln == NULL) { | |
| 134 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
| 135 } | |
| 136 | |
| 137 rbtree = lzcf->shm_zone->data; | |
| 138 shpool = (ngx_slab_pool_t *) lzcf->shm_zone->shm.addr; | |
| 139 | |
| 140 ngx_shmtx_lock(&shpool->mutex); | |
| 141 | |
| 142 node = rbtree->root; | |
| 143 sentinel = rbtree->sentinel; | |
| 144 | |
| 145 while (node != sentinel) { | |
| 146 | |
| 147 if (hash < node->key) { | |
| 148 node = node->left; | |
| 149 continue; | |
| 150 } | |
| 151 | |
| 152 if (hash > node->key) { | |
| 153 node = node->right; | |
| 154 continue; | |
| 155 } | |
| 156 | |
| 157 if (hash == node->key ){ | |
| 981 | 158 lz = (ngx_http_limit_zone_node_t *) &node->color; |
| 980 | 159 |
| 160 if (len == (size_t) lz->len | |
| 161 && ngx_strncmp(lz->data, vv->data, len) == 0) | |
| 162 { | |
| 981 | 163 if ((ngx_uint_t) lz->conn < lzcf->conn) { |
| 980 | 164 lz->conn++; |
| 165 goto done; | |
| 166 } | |
| 167 | |
| 168 ngx_shmtx_unlock(&shpool->mutex); | |
| 169 | |
| 170 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 171 } | |
| 172 } | |
| 173 } | |
| 174 | |
| 981 | 175 n = offsetof(ngx_rbtree_node_t, color) |
| 980 | 176 + offsetof(ngx_http_limit_zone_node_t, data) |
| 177 + len; | |
| 178 | |
| 179 node = ngx_slab_alloc_locked(shpool, n); | |
| 180 if (node == NULL) { | |
| 181 ngx_shmtx_unlock(&shpool->mutex); | |
| 182 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 183 } | |
| 184 | |
| 981 | 185 lz = (ngx_http_limit_zone_node_t *) &node->color; |
| 980 | 186 |
| 187 node->key = hash; | |
| 981 | 188 lz->len = (u_char) len; |
| 980 | 189 lz->conn = 1; |
| 190 ngx_memcpy(lz->data, vv->data, len); | |
| 191 | |
| 192 ngx_rbtree_insert(rbtree, node); | |
| 193 | |
| 194 done: | |
| 195 | |
| 196 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 197 "limit zone: %08XD %d", node->key, lz->conn); | |
| 198 | |
| 199 ngx_shmtx_unlock(&shpool->mutex); | |
| 200 | |
| 201 cln->handler = ngx_http_limit_zone_cleanup; | |
| 202 lzcln = cln->data; | |
| 203 | |
| 204 lzcln->shm_zone = lzcf->shm_zone; | |
| 205 lzcln->node = node; | |
| 206 | |
| 207 return NGX_DECLINED; | |
| 208 } | |
| 209 | |
| 210 | |
| 211 static void | |
| 212 ngx_http_limit_zone_cleanup(void *data) | |
| 213 { | |
| 214 ngx_http_limit_zone_cleanup_t *lzcln = data; | |
| 215 | |
| 216 ngx_rbtree_t *rbtree; | |
| 217 ngx_slab_pool_t *shpool; | |
| 218 ngx_rbtree_node_t *node; | |
| 219 ngx_http_limit_zone_node_t *lz; | |
| 220 | |
| 221 rbtree = lzcln->shm_zone->data; | |
| 222 shpool = (ngx_slab_pool_t *) lzcln->shm_zone->shm.addr; | |
| 223 node = lzcln->node; | |
| 981 | 224 lz = (ngx_http_limit_zone_node_t *) &node->color; |
| 980 | 225 |
| 226 ngx_shmtx_lock(&shpool->mutex); | |
| 227 | |
| 228 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lzcln->shm_zone->shm.log, 0, | |
| 229 "limit zone cleanup: %08XD %d", node->key, lz->conn); | |
| 230 | |
| 231 lz->conn--; | |
| 232 | |
| 233 if (lz->conn == 0) { | |
| 234 ngx_rbtree_delete(rbtree, node); | |
| 235 ngx_slab_free_locked(shpool, node); | |
| 236 } | |
| 237 | |
| 238 ngx_shmtx_unlock(&shpool->mutex); | |
| 239 } | |
| 240 | |
| 241 | |
| 242 static ngx_int_t | |
| 243 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone) | |
| 244 { | |
| 245 ngx_rbtree_t *rbtree; | |
| 246 ngx_slab_pool_t *shpool; | |
| 247 ngx_rbtree_node_t *sentinel; | |
| 248 | |
| 249 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; | |
| 250 | |
| 251 rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); | |
| 252 if (rbtree == NULL) { | |
| 253 return NGX_ERROR; | |
| 254 } | |
| 255 | |
| 256 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); | |
| 257 if (sentinel == NULL) { | |
| 258 return NGX_ERROR; | |
| 259 } | |
| 260 | |
| 261 ngx_rbtree_sentinel_init(sentinel); | |
| 262 | |
| 263 rbtree->root = sentinel; | |
| 264 rbtree->sentinel = sentinel; | |
| 265 rbtree->insert = ngx_rbtree_insert_value; | |
| 266 | |
| 267 shm_zone->data = rbtree; | |
| 268 | |
| 269 return NGX_OK; | |
| 270 } | |
| 271 | |
| 272 | |
| 273 static void * | |
| 274 ngx_http_limit_zone_create_conf(ngx_conf_t *cf) | |
| 275 { | |
| 276 ngx_http_limit_zone_conf_t *conf; | |
| 277 | |
| 278 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t)); | |
| 279 if (conf == NULL) { | |
| 280 return NGX_CONF_ERROR; | |
| 281 } | |
| 282 | |
| 283 /* | |
| 284 * set by ngx_pcalloc(): | |
| 285 * | |
| 286 * conf->shm_zone = NULL; | |
| 287 * conf->index = 0; | |
| 288 * conf->conn = 0; | |
| 289 */ | |
| 290 | |
| 291 return conf; | |
| 292 } | |
| 293 | |
| 294 | |
| 295 static char * | |
| 296 ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 297 { | |
| 298 ngx_http_limit_zone_conf_t *prev = parent; | |
| 299 ngx_http_limit_zone_conf_t *conf = child; | |
| 300 | |
| 301 if (conf->shm_zone == NULL) { | |
| 302 *conf = *prev; | |
| 303 } | |
| 304 | |
| 305 return NGX_CONF_OK; | |
| 306 } | |
| 307 | |
| 308 | |
| 309 static char * | |
| 310 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 311 { | |
| 312 ssize_t n; | |
| 313 ngx_str_t *value; | |
| 314 ngx_shm_zone_t *shm_zone; | |
| 315 | |
| 316 value = cf->args->elts; | |
| 317 | |
| 318 n = ngx_parse_size(&value[2]); | |
| 319 | |
| 320 if (n == NGX_ERROR) { | |
| 321 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 322 "invalid size of limit_zone \"%V\"", &value[2]); | |
| 323 return NGX_CONF_ERROR; | |
| 324 } | |
| 325 | |
| 326 if (n < (ngx_int_t) (8 * ngx_pagesize)) { | |
| 327 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 328 "limit_zone \"%V\" is too small", &value[1]); | |
| 329 return NGX_CONF_ERROR; | |
| 330 } | |
| 331 | |
| 332 | |
| 333 shm_zone = ngx_shared_memory_add(cf, &value[1], n, | |
| 334 &ngx_http_limit_zone_module); | |
| 335 if (shm_zone == NULL) { | |
| 336 return NGX_CONF_ERROR; | |
| 337 } | |
| 338 | |
| 339 shm_zone->init = ngx_http_limit_zone_init_zone; | |
| 340 | |
| 341 return NGX_CONF_OK; | |
| 342 } | |
| 343 | |
| 344 | |
| 345 static char * | |
| 346 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 347 { | |
| 348 ngx_http_limit_zone_conf_t *lzcf = conf; | |
| 349 | |
| 350 ngx_int_t n; | |
| 351 ngx_str_t *value; | |
| 352 | |
| 353 value = cf->args->elts; | |
| 354 | |
| 355 n = ngx_atoi(value[1].data, value[1].len); | |
| 356 if (n <= 0) { | |
| 357 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 358 "invalid number of connections"); | |
| 359 return NGX_CONF_ERROR; | |
| 360 } | |
| 361 | |
| 362 if (value[2].data[0] != '$') { | |
| 363 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 364 "invalid variable name \"%V\"", &value[2]); | |
| 365 return NGX_CONF_ERROR; | |
| 366 } | |
| 367 | |
| 368 value[2].len--; | |
| 369 value[2].data++; | |
| 370 | |
| 371 lzcf->index = ngx_http_get_variable_index(cf, &value[2]); | |
| 372 if (lzcf->index == NGX_ERROR) { | |
| 373 return NGX_CONF_ERROR; | |
| 374 } | |
| 375 | |
| 376 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[3], 0, | |
| 377 &ngx_http_limit_zone_module); | |
| 378 if (lzcf->shm_zone == NULL) { | |
| 379 return NGX_CONF_ERROR; | |
| 380 } | |
| 381 | |
| 382 lzcf->conn = n; | |
| 383 | |
| 384 return NGX_CONF_OK; | |
| 385 } | |
| 386 | |
| 387 | |
| 388 static ngx_int_t | |
| 389 ngx_http_limit_zone_init(ngx_conf_t *cf) | |
| 390 { | |
| 391 ngx_http_handler_pt *h; | |
| 392 ngx_http_core_main_conf_t *cmcf; | |
| 393 | |
| 394 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 395 | |
| 396 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 397 if (h == NULL) { | |
| 398 return NGX_ERROR; | |
| 399 } | |
| 400 | |
| 401 *h = ngx_http_limit_zone_handler; | |
| 402 | |
| 403 return NGX_OK; | |
| 404 } |