Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_zone_module.c @ 987:14e68f471d02
new syntax
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Sun, 07 Jan 2007 18:52:34 +0000 |
| parents | dd128232e6ba |
| children | 1b9a4d92173f |
| 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 | |
|
984
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
116 if (r->limit_zone_set) { |
|
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
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117 return NGX_DECLINED; |
|
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
118 } |
|
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
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 | |
|
984
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
134 r->limit_zone_set = 1; |
|
dd128232e6ba
count connection once per request
Igor Sysoev <igor@sysoev.ru>
parents:
981
diff
changeset
|
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 | |
| 250 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone) | |
| 251 { | |
| 987 | 252 ngx_slab_pool_t *shpool; |
| 253 ngx_rbtree_node_t *sentinel; | |
| 254 ngx_http_limit_zone_ctx_t *ctx; | |
| 980 | 255 |
| 256 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; | |
| 987 | 257 ctx = shm_zone->data; |
| 980 | 258 |
| 987 | 259 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); |
| 260 if (ctx->rbtree == NULL) { | |
| 980 | 261 return NGX_ERROR; |
| 262 } | |
| 263 | |
| 264 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); | |
| 265 if (sentinel == NULL) { | |
| 266 return NGX_ERROR; | |
| 267 } | |
| 268 | |
| 269 ngx_rbtree_sentinel_init(sentinel); | |
| 270 | |
| 987 | 271 ctx->rbtree->root = sentinel; |
| 272 ctx->rbtree->sentinel = sentinel; | |
| 273 ctx->rbtree->insert = ngx_rbtree_insert_value; | |
| 980 | 274 |
| 275 return NGX_OK; | |
| 276 } | |
| 277 | |
| 278 | |
| 279 static void * | |
| 280 ngx_http_limit_zone_create_conf(ngx_conf_t *cf) | |
| 281 { | |
| 282 ngx_http_limit_zone_conf_t *conf; | |
| 283 | |
| 284 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t)); | |
| 285 if (conf == NULL) { | |
| 286 return NGX_CONF_ERROR; | |
| 287 } | |
| 288 | |
| 289 /* | |
| 290 * set by ngx_pcalloc(): | |
| 291 * | |
| 292 * conf->shm_zone = NULL; | |
| 293 * conf->conn = 0; | |
| 294 */ | |
| 295 | |
| 296 return conf; | |
| 297 } | |
| 298 | |
| 299 | |
| 300 static char * | |
| 301 ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 302 { | |
| 303 ngx_http_limit_zone_conf_t *prev = parent; | |
| 304 ngx_http_limit_zone_conf_t *conf = child; | |
| 305 | |
| 306 if (conf->shm_zone == NULL) { | |
| 307 *conf = *prev; | |
| 308 } | |
| 309 | |
| 310 return NGX_CONF_OK; | |
| 311 } | |
| 312 | |
| 313 | |
| 314 static char * | |
| 315 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 316 { | |
| 987 | 317 ssize_t n; |
| 318 ngx_str_t *value; | |
| 319 ngx_shm_zone_t *shm_zone; | |
| 320 ngx_http_limit_zone_ctx_t *ctx; | |
| 980 | 321 |
| 322 value = cf->args->elts; | |
| 323 | |
| 987 | 324 if (value[2].data[0] != '$') { |
| 325 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 326 "invalid variable name \"%V\"", &value[2]); | |
| 327 return NGX_CONF_ERROR; | |
| 328 } | |
| 329 | |
| 330 value[2].len--; | |
| 331 value[2].data++; | |
| 332 | |
| 333 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t)); | |
| 334 if (ctx == NULL) { | |
| 335 return NGX_CONF_ERROR; | |
| 336 } | |
| 337 | |
| 338 ctx->index = ngx_http_get_variable_index(cf, &value[2]); | |
| 339 if (ctx->index == NGX_ERROR) { | |
| 340 return NGX_CONF_ERROR; | |
| 341 } | |
| 342 | |
| 343 ctx->var = value[2]; | |
| 344 | |
| 345 n = ngx_parse_size(&value[3]); | |
| 980 | 346 |
| 347 if (n == NGX_ERROR) { | |
| 348 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 987 | 349 "invalid size of limit_zone \"%V\"", &value[3]); |
| 980 | 350 return NGX_CONF_ERROR; |
| 351 } | |
| 352 | |
| 353 if (n < (ngx_int_t) (8 * ngx_pagesize)) { | |
| 354 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 355 "limit_zone \"%V\" is too small", &value[1]); | |
| 356 return NGX_CONF_ERROR; | |
| 357 } | |
| 358 | |
| 359 | |
| 360 shm_zone = ngx_shared_memory_add(cf, &value[1], n, | |
| 361 &ngx_http_limit_zone_module); | |
| 362 if (shm_zone == NULL) { | |
| 363 return NGX_CONF_ERROR; | |
| 364 } | |
| 365 | |
| 987 | 366 if (shm_zone->data) { |
| 367 ctx = shm_zone->data; | |
| 368 | |
| 369 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 370 "limit_zone \"%V\" is already bound to variable \"%V\"", | |
| 371 &value[1], &ctx->var); | |
| 372 return NGX_CONF_ERROR; | |
| 373 } | |
| 374 | |
| 980 | 375 shm_zone->init = ngx_http_limit_zone_init_zone; |
| 987 | 376 shm_zone->data = ctx; |
| 980 | 377 |
| 378 return NGX_CONF_OK; | |
| 379 } | |
| 380 | |
| 381 | |
| 382 static char * | |
| 383 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 384 { | |
| 385 ngx_http_limit_zone_conf_t *lzcf = conf; | |
| 386 | |
| 387 ngx_int_t n; | |
| 388 ngx_str_t *value; | |
| 389 | |
| 390 value = cf->args->elts; | |
| 391 | |
| 987 | 392 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[1], 0, |
| 393 &ngx_http_limit_zone_module); | |
| 394 if (lzcf->shm_zone == NULL) { | |
| 980 | 395 return NGX_CONF_ERROR; |
| 396 } | |
| 397 | |
| 987 | 398 n = ngx_atoi(value[2].data, value[2].len); |
| 399 if (n <= 0) { | |
| 980 | 400 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 987 | 401 "invalid number of connections \"%V\"", &value[2]); |
| 980 | 402 return NGX_CONF_ERROR; |
| 403 } | |
| 404 | |
| 405 lzcf->conn = n; | |
| 406 | |
| 407 return NGX_CONF_OK; | |
| 408 } | |
| 409 | |
| 410 | |
| 411 static ngx_int_t | |
| 412 ngx_http_limit_zone_init(ngx_conf_t *cf) | |
| 413 { | |
| 414 ngx_http_handler_pt *h; | |
| 415 ngx_http_core_main_conf_t *cmcf; | |
| 416 | |
| 417 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 418 | |
| 419 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 420 if (h == NULL) { | |
| 421 return NGX_ERROR; | |
| 422 } | |
| 423 | |
| 424 *h = ngx_http_limit_zone_handler; | |
| 425 | |
| 426 return NGX_OK; | |
| 427 } |