Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_zone_module.c @ 1012:11ffb8e4753f
stop rbtree search early if equal hash was found
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Thu, 11 Jan 2007 16:57:30 +0000 |
| parents | 19118c44303f |
| children | 38be15c1379a |
| 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 len = vv->len; |
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135 |
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136 if (len == 0) { |
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137 return NGX_DECLINED; |
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138 } |
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139 |
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140 if (len > 255) { |
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141 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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142 "the value of the \"%V\" variable " |
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143 "is more than 255 bytes: \"%V\"", |
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144 &ctx->var, vv); |
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145 return NGX_DECLINED; |
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146 } |
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147 |
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148 r->main->limit_zone_set = 1; |
| 980 | 149 |
| 150 hash = ngx_crc32_short(vv->data, len); | |
| 151 | |
| 152 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_limit_zone_cleanup_t)); | |
| 153 if (cln == NULL) { | |
| 154 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
| 155 } | |
| 156 | |
| 157 shpool = (ngx_slab_pool_t *) lzcf->shm_zone->shm.addr; | |
| 158 | |
| 159 ngx_shmtx_lock(&shpool->mutex); | |
| 160 | |
| 987 | 161 node = ctx->rbtree->root; |
| 162 sentinel = ctx->rbtree->sentinel; | |
| 980 | 163 |
| 164 while (node != sentinel) { | |
| 165 | |
| 166 if (hash < node->key) { | |
| 167 node = node->left; | |
| 168 continue; | |
| 169 } | |
| 170 | |
| 171 if (hash > node->key) { | |
| 172 node = node->right; | |
| 173 continue; | |
| 174 } | |
| 175 | |
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176 /* hash == node->key */ |
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177 |
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178 do { |
| 981 | 179 lz = (ngx_http_limit_zone_node_t *) &node->color; |
| 980 | 180 |
| 181 if (len == (size_t) lz->len | |
| 182 && ngx_strncmp(lz->data, vv->data, len) == 0) | |
| 183 { | |
| 981 | 184 if ((ngx_uint_t) lz->conn < lzcf->conn) { |
| 980 | 185 lz->conn++; |
| 186 goto done; | |
| 187 } | |
| 188 | |
| 189 ngx_shmtx_unlock(&shpool->mutex); | |
| 190 | |
| 191 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 192 } | |
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193 |
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194 node = node->right; |
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195 |
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196 } while (node != sentinel && hash == node->key); |
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197 |
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198 break; |
| 980 | 199 } |
| 200 | |
| 981 | 201 n = offsetof(ngx_rbtree_node_t, color) |
| 980 | 202 + offsetof(ngx_http_limit_zone_node_t, data) |
| 203 + len; | |
| 204 | |
| 205 node = ngx_slab_alloc_locked(shpool, n); | |
| 206 if (node == NULL) { | |
| 207 ngx_shmtx_unlock(&shpool->mutex); | |
| 208 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 209 } | |
| 210 | |
| 981 | 211 lz = (ngx_http_limit_zone_node_t *) &node->color; |
| 980 | 212 |
| 213 node->key = hash; | |
| 981 | 214 lz->len = (u_char) len; |
| 980 | 215 lz->conn = 1; |
| 216 ngx_memcpy(lz->data, vv->data, len); | |
| 217 | |
| 987 | 218 ngx_rbtree_insert(ctx->rbtree, node); |
| 980 | 219 |
| 220 done: | |
| 221 | |
| 222 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 223 "limit zone: %08XD %d", node->key, lz->conn); | |
| 224 | |
| 225 ngx_shmtx_unlock(&shpool->mutex); | |
| 226 | |
| 227 cln->handler = ngx_http_limit_zone_cleanup; | |
| 228 lzcln = cln->data; | |
| 229 | |
| 230 lzcln->shm_zone = lzcf->shm_zone; | |
| 231 lzcln->node = node; | |
| 232 | |
| 233 return NGX_DECLINED; | |
| 234 } | |
| 235 | |
| 236 | |
| 237 static void | |
| 238 ngx_http_limit_zone_cleanup(void *data) | |
| 239 { | |
| 240 ngx_http_limit_zone_cleanup_t *lzcln = data; | |
| 241 | |
| 242 ngx_slab_pool_t *shpool; | |
| 243 ngx_rbtree_node_t *node; | |
| 987 | 244 ngx_http_limit_zone_ctx_t *ctx; |
| 980 | 245 ngx_http_limit_zone_node_t *lz; |
| 246 | |
| 987 | 247 ctx = lzcln->shm_zone->data; |
| 980 | 248 shpool = (ngx_slab_pool_t *) lzcln->shm_zone->shm.addr; |
| 249 node = lzcln->node; | |
| 981 | 250 lz = (ngx_http_limit_zone_node_t *) &node->color; |
| 980 | 251 |
| 252 ngx_shmtx_lock(&shpool->mutex); | |
| 253 | |
| 254 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lzcln->shm_zone->shm.log, 0, | |
| 255 "limit zone cleanup: %08XD %d", node->key, lz->conn); | |
| 256 | |
| 257 lz->conn--; | |
| 258 | |
| 259 if (lz->conn == 0) { | |
| 987 | 260 ngx_rbtree_delete(ctx->rbtree, node); |
| 980 | 261 ngx_slab_free_locked(shpool, node); |
| 262 } | |
| 263 | |
| 264 ngx_shmtx_unlock(&shpool->mutex); | |
| 265 } | |
| 266 | |
| 267 | |
| 268 static ngx_int_t | |
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269 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 270 { |
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271 ngx_http_limit_zone_ctx_t *octx = data; |
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272 |
| 987 | 273 ngx_slab_pool_t *shpool; |
| 274 ngx_rbtree_node_t *sentinel; | |
| 275 ngx_http_limit_zone_ctx_t *ctx; | |
| 980 | 276 |
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277 ctx = shm_zone->data; |
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278 |
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279 if (octx) { |
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280 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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281 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
| 1001 | 282 "limit_zone \"%V\" uses the \"%V\" variable " |
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283 "while previously it used the \"%V\" variable", |
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284 &shm_zone->name, &ctx->var, &octx->var); |
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285 return NGX_ERROR; |
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286 } |
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287 |
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288 ctx->rbtree = octx->rbtree; |
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289 |
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290 return NGX_OK; |
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291 } |
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292 |
| 980 | 293 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
| 294 | |
| 987 | 295 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); |
| 296 if (ctx->rbtree == NULL) { | |
| 980 | 297 return NGX_ERROR; |
| 298 } | |
| 299 | |
| 300 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); | |
| 301 if (sentinel == NULL) { | |
| 302 return NGX_ERROR; | |
| 303 } | |
| 304 | |
| 305 ngx_rbtree_sentinel_init(sentinel); | |
| 306 | |
| 987 | 307 ctx->rbtree->root = sentinel; |
| 308 ctx->rbtree->sentinel = sentinel; | |
| 309 ctx->rbtree->insert = ngx_rbtree_insert_value; | |
| 980 | 310 |
| 311 return NGX_OK; | |
| 312 } | |
| 313 | |
| 314 | |
| 315 static void * | |
| 316 ngx_http_limit_zone_create_conf(ngx_conf_t *cf) | |
| 317 { | |
| 318 ngx_http_limit_zone_conf_t *conf; | |
| 319 | |
| 320 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t)); | |
| 321 if (conf == NULL) { | |
| 322 return NGX_CONF_ERROR; | |
| 323 } | |
| 324 | |
| 325 /* | |
| 326 * set by ngx_pcalloc(): | |
| 327 * | |
| 328 * conf->shm_zone = NULL; | |
| 329 * conf->conn = 0; | |
| 330 */ | |
| 331 | |
| 332 return conf; | |
| 333 } | |
| 334 | |
| 335 | |
| 336 static char * | |
| 337 ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 338 { | |
| 339 ngx_http_limit_zone_conf_t *prev = parent; | |
| 340 ngx_http_limit_zone_conf_t *conf = child; | |
| 341 | |
| 342 if (conf->shm_zone == NULL) { | |
| 343 *conf = *prev; | |
| 344 } | |
| 345 | |
| 346 return NGX_CONF_OK; | |
| 347 } | |
| 348 | |
| 349 | |
| 350 static char * | |
| 351 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 352 { | |
| 987 | 353 ssize_t n; |
| 354 ngx_str_t *value; | |
| 355 ngx_shm_zone_t *shm_zone; | |
| 356 ngx_http_limit_zone_ctx_t *ctx; | |
| 980 | 357 |
| 358 value = cf->args->elts; | |
| 359 | |
| 987 | 360 if (value[2].data[0] != '$') { |
| 361 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 362 "invalid variable name \"%V\"", &value[2]); | |
| 363 return NGX_CONF_ERROR; | |
| 364 } | |
| 365 | |
| 366 value[2].len--; | |
| 367 value[2].data++; | |
| 368 | |
| 369 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t)); | |
| 370 if (ctx == NULL) { | |
| 371 return NGX_CONF_ERROR; | |
| 372 } | |
| 373 | |
| 374 ctx->index = ngx_http_get_variable_index(cf, &value[2]); | |
| 375 if (ctx->index == NGX_ERROR) { | |
| 376 return NGX_CONF_ERROR; | |
| 377 } | |
| 378 | |
| 379 ctx->var = value[2]; | |
| 380 | |
| 381 n = ngx_parse_size(&value[3]); | |
| 980 | 382 |
| 383 if (n == NGX_ERROR) { | |
| 384 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 987 | 385 "invalid size of limit_zone \"%V\"", &value[3]); |
| 980 | 386 return NGX_CONF_ERROR; |
| 387 } | |
| 388 | |
| 389 if (n < (ngx_int_t) (8 * ngx_pagesize)) { | |
| 390 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 391 "limit_zone \"%V\" is too small", &value[1]); | |
| 392 return NGX_CONF_ERROR; | |
| 393 } | |
| 394 | |
| 395 | |
| 396 shm_zone = ngx_shared_memory_add(cf, &value[1], n, | |
| 397 &ngx_http_limit_zone_module); | |
| 398 if (shm_zone == NULL) { | |
| 399 return NGX_CONF_ERROR; | |
| 400 } | |
| 401 | |
| 987 | 402 if (shm_zone->data) { |
| 403 ctx = shm_zone->data; | |
| 404 | |
| 405 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 406 "limit_zone \"%V\" is already bound to variable \"%V\"", | |
| 407 &value[1], &ctx->var); | |
| 408 return NGX_CONF_ERROR; | |
| 409 } | |
| 410 | |
| 980 | 411 shm_zone->init = ngx_http_limit_zone_init_zone; |
| 987 | 412 shm_zone->data = ctx; |
| 980 | 413 |
| 414 return NGX_CONF_OK; | |
| 415 } | |
| 416 | |
| 417 | |
| 418 static char * | |
| 419 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 420 { | |
| 421 ngx_http_limit_zone_conf_t *lzcf = conf; | |
| 422 | |
| 423 ngx_int_t n; | |
| 424 ngx_str_t *value; | |
| 425 | |
| 426 value = cf->args->elts; | |
| 427 | |
| 987 | 428 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[1], 0, |
| 429 &ngx_http_limit_zone_module); | |
| 430 if (lzcf->shm_zone == NULL) { | |
| 980 | 431 return NGX_CONF_ERROR; |
| 432 } | |
| 433 | |
| 987 | 434 n = ngx_atoi(value[2].data, value[2].len); |
| 435 if (n <= 0) { | |
| 980 | 436 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 987 | 437 "invalid number of connections \"%V\"", &value[2]); |
| 980 | 438 return NGX_CONF_ERROR; |
| 439 } | |
| 440 | |
|
1011
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
441 if (n > 65535) { |
|
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
442 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
|
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
443 "connection limit must be less 65536"); |
|
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
444 return NGX_CONF_ERROR; |
|
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
445 } |
|
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
446 |
| 980 | 447 lzcf->conn = n; |
| 448 | |
| 449 return NGX_CONF_OK; | |
| 450 } | |
| 451 | |
| 452 | |
| 453 static ngx_int_t | |
| 454 ngx_http_limit_zone_init(ngx_conf_t *cf) | |
| 455 { | |
| 456 ngx_http_handler_pt *h; | |
| 457 ngx_http_core_main_conf_t *cmcf; | |
| 458 | |
| 459 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 460 | |
| 461 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 462 if (h == NULL) { | |
| 463 return NGX_ERROR; | |
| 464 } | |
| 465 | |
| 466 *h = ngx_http_limit_zone_handler; | |
| 467 | |
| 468 return NGX_OK; | |
| 469 } |