Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 2612:038dc63b657a
delete duplicate error logging
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Fri, 27 Mar 2009 19:32:55 +0000 |
| parents | 2bce3f6416c6 |
| children | d5896f6608e8 |
| 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; |
| 2294 | 14 u_char dummy; |
| 15 u_short len; | |
| 16 ngx_queue_t queue; | |
| 17 ngx_msec_t last; | |
| 2313 | 18 ngx_uint_t excess; /* integer value, 1 corresponds to 0.001 r/s */ |
| 980 | 19 u_char data[1]; |
| 2294 | 20 } ngx_http_limit_req_node_t; |
| 980 | 21 |
| 22 | |
| 23 typedef struct { | |
| 987 | 24 ngx_rbtree_t *rbtree; |
| 2294 | 25 ngx_queue_t *queue; |
| 26 ngx_slab_pool_t *shpool; | |
| 2313 | 27 ngx_uint_t rate; /* integer value, 1 corresponds to 0.001 r/s */ |
| 987 | 28 ngx_int_t index; |
| 29 ngx_str_t var; | |
| 2294 | 30 } ngx_http_limit_req_ctx_t; |
| 987 | 31 |
| 32 | |
| 33 typedef struct { | |
| 980 | 34 ngx_shm_zone_t *shm_zone; |
| 2313 | 35 ngx_uint_t burst; /* integer value, 1 corresponds to 0.001 r/s */ |
| 36 ngx_uint_t nodelay;/* unsigned nodelay:1 */ | |
| 2294 | 37 } ngx_http_limit_req_conf_t; |
| 980 | 38 |
| 39 | |
| 2294 | 40 static void ngx_http_limit_req_delay(ngx_http_request_t *r); |
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41 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, |
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42 ngx_uint_t hash, u_char *data, size_t len, ngx_http_limit_req_node_t **lrp); |
| 2294 | 43 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, |
| 44 ngx_uint_t n); | |
| 980 | 45 |
| 2294 | 46 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf); |
| 47 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, | |
| 980 | 48 void *child); |
| 2294 | 49 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
| 980 | 50 void *conf); |
| 2294 | 51 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, |
| 980 | 52 void *conf); |
| 2294 | 53 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf); |
| 980 | 54 |
| 55 | |
| 2294 | 56 static ngx_command_t ngx_http_limit_req_commands[] = { |
| 980 | 57 |
| 2294 | 58 { ngx_string("limit_req_zone"), |
| 987 | 59 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
| 2294 | 60 ngx_http_limit_req_zone, |
| 980 | 61 0, |
| 62 0, | |
| 63 NULL }, | |
| 64 | |
| 2294 | 65 { ngx_string("limit_req"), |
| 66 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123, | |
| 67 ngx_http_limit_req, | |
| 980 | 68 NGX_HTTP_LOC_CONF_OFFSET, |
| 69 0, | |
| 70 NULL }, | |
| 71 | |
| 72 ngx_null_command | |
| 73 }; | |
| 74 | |
| 75 | |
| 2294 | 76 static ngx_http_module_t ngx_http_limit_req_module_ctx = { |
| 980 | 77 NULL, /* preconfiguration */ |
| 2294 | 78 ngx_http_limit_req_init, /* postconfiguration */ |
| 980 | 79 |
| 80 NULL, /* create main configuration */ | |
| 81 NULL, /* init main configuration */ | |
| 82 | |
| 83 NULL, /* create server configuration */ | |
| 84 NULL, /* merge server configuration */ | |
| 85 | |
| 2294 | 86 ngx_http_limit_req_create_conf, /* create location configration */ |
| 87 ngx_http_limit_req_merge_conf /* merge location configration */ | |
| 980 | 88 }; |
| 89 | |
| 90 | |
| 2294 | 91 ngx_module_t ngx_http_limit_req_module = { |
| 980 | 92 NGX_MODULE_V1, |
| 2294 | 93 &ngx_http_limit_req_module_ctx, /* module context */ |
| 94 ngx_http_limit_req_commands, /* module directives */ | |
| 980 | 95 NGX_HTTP_MODULE, /* module type */ |
| 96 NULL, /* init master */ | |
| 97 NULL, /* init module */ | |
| 98 NULL, /* init process */ | |
| 99 NULL, /* init thread */ | |
| 100 NULL, /* exit thread */ | |
| 101 NULL, /* exit process */ | |
| 102 NULL, /* exit master */ | |
| 103 NGX_MODULE_V1_PADDING | |
| 104 }; | |
| 105 | |
| 106 | |
| 107 static ngx_int_t | |
| 2294 | 108 ngx_http_limit_req_handler(ngx_http_request_t *r) |
| 980 | 109 { |
| 2294 | 110 size_t len, n; |
| 111 uint32_t hash; | |
| 112 ngx_int_t rc; | |
| 2313 | 113 ngx_uint_t excess; |
| 2294 | 114 ngx_time_t *tp; |
| 115 ngx_rbtree_node_t *node; | |
| 116 ngx_http_variable_value_t *vv; | |
| 117 ngx_http_limit_req_ctx_t *ctx; | |
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118 ngx_http_limit_req_node_t *lr; |
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119 ngx_http_limit_req_conf_t *lrcf; |
| 980 | 120 |
| 2294 | 121 if (r->main->limit_req_set) { |
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122 return NGX_DECLINED; |
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123 } |
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124 |
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125 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module); |
| 980 | 126 |
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127 if (lrcf->shm_zone == NULL) { |
| 980 | 128 return NGX_DECLINED; |
| 129 } | |
| 130 | |
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131 ctx = lrcf->shm_zone->data; |
| 987 | 132 |
| 133 vv = ngx_http_get_indexed_variable(r, ctx->index); | |
| 980 | 134 |
| 135 if (vv == NULL || vv->not_found) { | |
| 136 return NGX_DECLINED; | |
| 137 } | |
| 138 | |
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139 len = vv->len; |
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140 |
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141 if (len == 0) { |
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142 return NGX_DECLINED; |
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143 } |
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144 |
| 2294 | 145 if (len > 65535) { |
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146 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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147 "the value of the \"%V\" variable " |
| 2294 | 148 "is more than 65535 bytes: \"%v\"", |
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149 &ctx->var, vv); |
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150 return NGX_DECLINED; |
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151 } |
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152 |
| 2294 | 153 r->main->limit_req_set = 1; |
| 980 | 154 |
| 155 hash = ngx_crc32_short(vv->data, len); | |
| 156 | |
| 2294 | 157 ngx_shmtx_lock(&ctx->shpool->mutex); |
| 158 | |
| 159 ngx_http_limit_req_expire(ctx, 1); | |
| 160 | |
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161 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &lr); |
| 2294 | 162 |
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163 if (lr) { |
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164 ngx_queue_remove(&lr->queue); |
| 2294 | 165 |
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166 ngx_queue_insert_head(ctx->queue, &lr->queue); |
| 2294 | 167 |
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168 excess = lr->excess; |
| 2294 | 169 |
| 170 } else { | |
| 2313 | 171 excess = 0; |
| 980 | 172 } |
| 173 | |
| 2313 | 174 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
| 175 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000); | |
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176 |
| 2294 | 177 if (rc == NGX_BUSY) { |
| 178 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
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179 |
| 2294 | 180 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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181 "limiting requests, excess: %ui.%03ui by zone \"%V\"", |
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182 excess / 1000, excess % 1000, &lrcf->shm_zone->name); |
| 980 | 183 |
| 184 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 185 } | |
| 186 | |
| 2294 | 187 if (rc == NGX_AGAIN) { |
| 188 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
| 189 | |
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190 if (lrcf->nodelay) { |
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191 return NGX_DECLINED; |
| 2294 | 192 } |
| 193 | |
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194 ngx_log_error(NGX_LOG_WARN, r->connection->log, 0, |
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195 "delaying request, excess: %ui.%03ui, by zone \"%V\"", |
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196 excess / 1000, excess % 1000, &lrcf->shm_zone->name); |
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197 |
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198 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
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199 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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200 } |
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201 |
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202 r->read_event_handler = ngx_http_test_reading; |
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203 r->write_event_handler = ngx_http_limit_req_delay; |
| 2313 | 204 ngx_add_timer(r->connection->write, (ngx_msec_t) excess); |
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205 |
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206 return NGX_AGAIN; |
| 2294 | 207 } |
| 208 | |
| 209 if (rc == NGX_OK) { | |
| 210 goto done; | |
| 211 } | |
| 212 | |
| 213 /* rc == NGX_DECLINED */ | |
| 214 | |
| 215 n = offsetof(ngx_rbtree_node_t, color) | |
| 216 + offsetof(ngx_http_limit_req_node_t, data) | |
| 217 + len; | |
| 218 | |
| 219 node = ngx_slab_alloc_locked(ctx->shpool, n); | |
| 220 if (node == NULL) { | |
| 221 | |
| 222 ngx_http_limit_req_expire(ctx, 0); | |
| 223 | |
| 224 node = ngx_slab_alloc_locked(ctx->shpool, n); | |
| 225 if (node == NULL) { | |
| 226 ngx_shmtx_unlock(&ctx->shpool->mutex); | |
| 227 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 228 } | |
| 229 } | |
| 230 | |
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231 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 980 | 232 |
| 233 node->key = hash; | |
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234 lr->len = (u_char) len; |
| 2294 | 235 |
| 236 tp = ngx_timeofday(); | |
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237 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
| 2294 | 238 |
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239 lr->excess = 0; |
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240 ngx_memcpy(lr->data, vv->data, len); |
| 980 | 241 |
| 987 | 242 ngx_rbtree_insert(ctx->rbtree, node); |
| 980 | 243 |
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244 ngx_queue_insert_head(ctx->queue, &lr->queue); |
| 2294 | 245 |
| 980 | 246 done: |
| 247 | |
| 2294 | 248 ngx_shmtx_unlock(&ctx->shpool->mutex); |
| 980 | 249 |
| 250 return NGX_DECLINED; | |
| 251 } | |
| 252 | |
| 253 | |
| 254 static void | |
| 2294 | 255 ngx_http_limit_req_delay(ngx_http_request_t *r) |
| 256 { | |
| 257 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 258 "limit_req delay"); | |
| 259 | |
| 260 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { | |
| 261 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
| 262 return; | |
| 263 } | |
| 264 | |
| 265 r->read_event_handler = ngx_http_block_reading; | |
| 266 r->write_event_handler = ngx_http_core_run_phases; | |
| 267 | |
| 268 ngx_http_core_run_phases(r); | |
| 269 } | |
| 270 | |
| 271 | |
| 272 static void | |
| 273 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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274 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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275 { |
| 2294 | 276 ngx_rbtree_node_t **p; |
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277 ngx_http_limit_req_node_t *lrn, *lrnt; |
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278 |
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279 for ( ;; ) { |
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280 |
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281 if (node->key < temp->key) { |
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282 |
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283 p = &temp->left; |
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284 |
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285 } else if (node->key > temp->key) { |
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286 |
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287 p = &temp->right; |
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288 |
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289 } else { /* node->key == temp->key */ |
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290 |
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291 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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292 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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293 |
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294 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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295 ? &temp->left : &temp->right; |
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296 } |
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297 |
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298 if (*p == sentinel) { |
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299 break; |
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300 } |
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301 |
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302 temp = *p; |
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303 } |
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304 |
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305 *p = node; |
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306 node->parent = temp; |
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307 node->left = sentinel; |
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308 node->right = sentinel; |
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309 ngx_rbt_red(node); |
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310 } |
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311 |
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312 |
| 2294 | 313 static ngx_int_t |
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314 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash, |
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315 u_char *data, size_t len, ngx_http_limit_req_node_t **lrp) |
| 980 | 316 { |
| 2313 | 317 ngx_int_t rc, excess; |
| 2294 | 318 ngx_time_t *tp; |
| 319 ngx_msec_t now; | |
| 320 ngx_msec_int_t ms; | |
| 321 ngx_rbtree_node_t *node, *sentinel; | |
| 322 ngx_http_limit_req_ctx_t *ctx; | |
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323 ngx_http_limit_req_node_t *lr; |
| 2294 | 324 |
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325 ctx = lrcf->shm_zone->data; |
| 2294 | 326 |
| 327 node = ctx->rbtree->root; | |
| 328 sentinel = ctx->rbtree->sentinel; | |
| 980 | 329 |
| 2294 | 330 while (node != sentinel) { |
| 331 | |
| 332 if (hash < node->key) { | |
| 333 node = node->left; | |
| 334 continue; | |
| 335 } | |
| 336 | |
| 337 if (hash > node->key) { | |
| 338 node = node->right; | |
| 339 continue; | |
| 340 } | |
| 341 | |
| 342 /* hash == node->key */ | |
| 343 | |
| 344 do { | |
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345 lr = (ngx_http_limit_req_node_t *) &node->color; |
| 980 | 346 |
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347 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
| 2294 | 348 |
| 349 if (rc == 0) { | |
| 350 | |
| 351 tp = ngx_timeofday(); | |
| 980 | 352 |
| 2294 | 353 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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354 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 355 |
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356 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
| 2294 | 357 |
| 2313 | 358 if (excess < 0) { |
| 359 excess = 0; | |
| 2294 | 360 } |
| 361 | |
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362 lr->excess = excess; |
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363 lr->last = now; |
| 980 | 364 |
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365 *lrp = lr; |
| 2294 | 366 |
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367 if ((ngx_uint_t) excess > lrcf->burst) { |
| 2294 | 368 return NGX_BUSY; |
| 369 } | |
| 980 | 370 |
| 2313 | 371 if (excess) { |
| 2294 | 372 return NGX_AGAIN; |
| 373 } | |
| 980 | 374 |
| 2294 | 375 return NGX_OK; |
| 376 } | |
| 377 | |
| 378 node = (rc < 0) ? node->left : node->right; | |
| 379 | |
| 380 } while (node != sentinel && hash == node->key); | |
| 381 | |
| 382 break; | |
| 980 | 383 } |
| 384 | |
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385 *lrp = NULL; |
| 2294 | 386 |
| 387 return NGX_DECLINED; | |
| 388 } | |
| 389 | |
| 390 | |
| 391 static void | |
| 392 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
| 393 { | |
| 2313 | 394 ngx_int_t excess; |
| 2294 | 395 ngx_time_t *tp; |
| 396 ngx_msec_t now; | |
| 397 ngx_queue_t *q; | |
| 398 ngx_msec_int_t ms; | |
| 399 ngx_rbtree_node_t *node; | |
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400 ngx_http_limit_req_node_t *lr; |
| 2294 | 401 |
| 402 tp = ngx_timeofday(); | |
| 403 | |
| 404 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
| 405 | |
| 406 /* | |
| 407 * n == 1 deletes one or two zero rate entries | |
| 408 * n == 0 deletes oldest entry by force | |
| 409 * and one or two zero rate entries | |
| 410 */ | |
| 411 | |
| 412 while (n < 3) { | |
| 413 | |
| 414 if (ngx_queue_empty(ctx->queue)) { | |
| 415 return; | |
| 416 } | |
| 417 | |
| 418 q = ngx_queue_last(ctx->queue); | |
| 419 | |
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420 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
| 2294 | 421 |
| 422 if (n++ != 0) { | |
| 423 | |
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424 ms = (ngx_msec_int_t) (now - lr->last); |
| 2294 | 425 ms = ngx_abs(ms); |
| 426 | |
| 427 if (ms < 60000) { | |
| 428 return; | |
| 429 } | |
| 430 | |
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431 excess = lr->excess - ctx->rate * ms / 1000; |
| 2294 | 432 |
| 2313 | 433 if (excess > 0) { |
| 2294 | 434 return; |
| 435 } | |
| 436 } | |
| 437 | |
| 438 ngx_queue_remove(q); | |
| 439 | |
| 440 node = (ngx_rbtree_node_t *) | |
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441 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
| 2294 | 442 |
| 443 ngx_rbtree_delete(ctx->rbtree, node); | |
| 444 | |
| 445 ngx_slab_free_locked(ctx->shpool, node); | |
| 446 } | |
| 980 | 447 } |
| 448 | |
| 449 | |
| 450 static ngx_int_t | |
| 2294 | 451 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 452 { |
| 2294 | 453 ngx_http_limit_req_ctx_t *octx = data; |
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454 |
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455 size_t len; |
| 2294 | 456 ngx_rbtree_node_t *sentinel; |
| 457 ngx_http_limit_req_ctx_t *ctx; | |
| 980 | 458 |
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459 ctx = shm_zone->data; |
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460 |
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461 if (octx) { |
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462 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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463 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
| 2294 | 464 "limit_req \"%V\" uses the \"%V\" variable " |
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465 "while previously it used the \"%V\" variable", |
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466 &shm_zone->name, &ctx->var, &octx->var); |
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467 return NGX_ERROR; |
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468 } |
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469 |
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470 ctx->rbtree = octx->rbtree; |
| 2294 | 471 ctx->queue = octx->queue; |
| 472 ctx->shpool = octx->shpool; | |
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473 |
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474 return NGX_OK; |
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475 } |
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476 |
| 2294 | 477 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
| 980 | 478 |
| 2294 | 479 ctx->rbtree = ngx_slab_alloc(ctx->shpool, sizeof(ngx_rbtree_t)); |
| 987 | 480 if (ctx->rbtree == NULL) { |
| 980 | 481 return NGX_ERROR; |
| 482 } | |
| 483 | |
| 2294 | 484 sentinel = ngx_slab_alloc(ctx->shpool, sizeof(ngx_rbtree_node_t)); |
| 980 | 485 if (sentinel == NULL) { |
| 486 return NGX_ERROR; | |
| 487 } | |
| 488 | |
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489 ngx_rbtree_init(ctx->rbtree, sentinel, |
| 2294 | 490 ngx_http_limit_req_rbtree_insert_value); |
| 491 | |
| 492 ctx->queue = ngx_slab_alloc(ctx->shpool, sizeof(ngx_queue_t)); | |
| 493 if (ctx->queue == NULL) { | |
| 494 return NGX_ERROR; | |
| 495 } | |
| 496 | |
| 497 ngx_queue_init(ctx->queue); | |
| 980 | 498 |
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499 len = sizeof(" in limit_req zone \"\"") + shm_zone->name.len; |
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500 |
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501 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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502 if (ctx->shpool->log_ctx == NULL) { |
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503 return NGX_ERROR; |
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504 } |
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505 |
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506 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
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507 &shm_zone->name); |
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508 |
| 980 | 509 return NGX_OK; |
| 510 } | |
| 511 | |
| 512 | |
| 513 static void * | |
| 2294 | 514 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
| 980 | 515 { |
| 2294 | 516 ngx_http_limit_req_conf_t *conf; |
| 980 | 517 |
| 2294 | 518 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
| 980 | 519 if (conf == NULL) { |
| 520 return NGX_CONF_ERROR; | |
| 521 } | |
| 522 | |
| 523 /* | |
| 524 * set by ngx_pcalloc(): | |
| 525 * | |
| 526 * conf->shm_zone = NULL; | |
| 2375 | 527 * conf->burst = 0; |
|
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528 * conf->nodelay = 0; |
| 980 | 529 */ |
| 530 | |
| 531 return conf; | |
| 532 } | |
| 533 | |
| 534 | |
| 535 static char * | |
| 2294 | 536 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
| 980 | 537 { |
| 2294 | 538 ngx_http_limit_req_conf_t *prev = parent; |
| 539 ngx_http_limit_req_conf_t *conf = child; | |
| 980 | 540 |
| 541 if (conf->shm_zone == NULL) { | |
| 542 *conf = *prev; | |
| 543 } | |
| 544 | |
| 545 return NGX_CONF_OK; | |
| 546 } | |
| 547 | |
| 548 | |
| 549 static char * | |
| 2294 | 550 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 551 { |
| 2294 | 552 u_char *p; |
| 553 size_t size, len; | |
| 554 ngx_str_t *value, name, s; | |
| 555 ngx_int_t rate, scale; | |
| 556 ngx_uint_t i; | |
| 557 ngx_shm_zone_t *shm_zone; | |
| 558 ngx_http_limit_req_ctx_t *ctx; | |
| 980 | 559 |
| 560 value = cf->args->elts; | |
| 561 | |
| 2294 | 562 ctx = NULL; |
| 563 size = 0; | |
| 564 rate = 1; | |
| 565 scale = 1; | |
| 566 name.len = 0; | |
| 567 | |
| 568 for (i = 1; i < cf->args->nelts; i++) { | |
| 569 | |
| 570 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 571 | |
| 572 name.data = value[i].data + 5; | |
| 573 | |
| 574 p = (u_char *) ngx_strchr(name.data, ':'); | |
| 575 | |
| 576 if (p) { | |
| 577 name.len = p - name.data; | |
| 578 | |
| 579 p++; | |
| 580 | |
| 581 s.len = value[i].data + value[i].len - p; | |
| 582 s.data = p; | |
| 583 | |
| 584 size = ngx_parse_size(&s); | |
| 585 if (size > 8191) { | |
| 586 continue; | |
| 587 } | |
| 588 } | |
| 589 | |
| 590 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 591 "invalid zone size \"%V\"", &value[i]); | |
| 592 return NGX_CONF_ERROR; | |
| 593 } | |
| 594 | |
| 595 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
| 596 | |
| 597 len = value[i].len; | |
| 598 p = value[i].data + len - 3; | |
| 987 | 599 |
| 2294 | 600 if (ngx_strncmp(p, "r/s", 3) == 0) { |
| 601 scale = 1; | |
| 602 len -= 3; | |
| 603 | |
| 604 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
| 605 scale = 60; | |
| 606 len -= 3; | |
| 607 } | |
| 608 | |
| 609 rate = ngx_atoi(value[i].data + 5, len - 5); | |
| 610 if (rate <= NGX_ERROR) { | |
| 611 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 612 "invalid rate \"%V\"", &value[i]); | |
| 613 return NGX_CONF_ERROR; | |
| 614 } | |
| 615 | |
| 616 continue; | |
| 617 } | |
| 618 | |
| 619 if (value[i].data[0] == '$') { | |
| 987 | 620 |
| 2294 | 621 value[i].len--; |
| 622 value[i].data++; | |
| 623 | |
| 624 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
| 625 if (ctx == NULL) { | |
| 626 return NGX_CONF_ERROR; | |
| 627 } | |
| 628 | |
| 629 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
| 630 if (ctx->index == NGX_ERROR) { | |
| 631 return NGX_CONF_ERROR; | |
| 632 } | |
| 633 | |
| 634 ctx->var = value[i]; | |
| 635 | |
| 636 continue; | |
| 637 } | |
| 638 | |
| 639 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 640 "invalid parameter \"%V\"", &value[i]); | |
| 987 | 641 return NGX_CONF_ERROR; |
| 642 } | |
| 643 | |
| 2294 | 644 if (name.len == 0 || size == 0) { |
| 645 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 646 "\"%V\" must have \"zone\" parameter", | |
| 647 &cmd->name); | |
| 987 | 648 return NGX_CONF_ERROR; |
| 649 } | |
| 650 | |
| 2294 | 651 if (ctx == NULL) { |
| 980 | 652 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 653 "no variable is defined for limit_req_zone \"%V\"", |
| 654 &cmd->name); | |
| 980 | 655 return NGX_CONF_ERROR; |
| 656 } | |
| 657 | |
| 2313 | 658 ctx->rate = rate * 1000 / scale; |
| 980 | 659 |
| 2294 | 660 shm_zone = ngx_shared_memory_add(cf, &name, size, |
| 661 &ngx_http_limit_req_module); | |
| 980 | 662 if (shm_zone == NULL) { |
| 663 return NGX_CONF_ERROR; | |
| 664 } | |
| 665 | |
| 987 | 666 if (shm_zone->data) { |
| 667 ctx = shm_zone->data; | |
| 668 | |
| 669 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 2294 | 670 "limit_req_zone \"%V\" is already bound to variable \"%V\"", |
| 671 &value[1], &ctx->var); | |
| 987 | 672 return NGX_CONF_ERROR; |
| 673 } | |
| 674 | |
| 2294 | 675 shm_zone->init = ngx_http_limit_req_init_zone; |
| 987 | 676 shm_zone->data = ctx; |
| 980 | 677 |
| 678 return NGX_CONF_OK; | |
| 679 } | |
| 680 | |
| 681 | |
| 682 static char * | |
| 2294 | 683 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
| 980 | 684 { |
|
2374
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parents:
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diff
changeset
|
685 ngx_http_limit_req_conf_t *lrcf = conf; |
| 980 | 686 |
|
2300
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*) correct leaky bucket implementation
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parents:
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|
687 ngx_int_t burst; |
|
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688 ngx_str_t *value, s; |
|
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*) correct leaky bucket implementation
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parents:
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|
689 ngx_uint_t i; |
| 2294 | 690 |
|
2374
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parents:
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changeset
|
691 if (lrcf->shm_zone) { |
| 2294 | 692 return "is duplicate"; |
| 693 } | |
| 980 | 694 |
| 695 value = cf->args->elts; | |
| 696 | |
| 2294 | 697 burst = 0; |
| 698 | |
| 699 for (i = 1; i < cf->args->nelts; i++) { | |
| 700 | |
| 701 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
| 702 | |
| 703 s.len = value[i].len - 5; | |
| 704 s.data = value[i].data + 5; | |
| 705 | |
|
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parents:
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changeset
|
706 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0, |
| 2294 | 707 &ngx_http_limit_req_module); |
|
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parents:
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changeset
|
708 if (lrcf->shm_zone == NULL) { |
| 2294 | 709 return NGX_CONF_ERROR; |
| 710 } | |
| 711 | |
| 712 continue; | |
| 713 } | |
| 714 | |
| 715 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
| 716 | |
|
2300
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parents:
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changeset
|
717 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
| 2294 | 718 if (burst <= 0) { |
| 719 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 720 "invalid burst rate \"%V\"", &value[i]); | |
| 721 return NGX_CONF_ERROR; | |
| 722 } | |
| 723 | |
| 724 continue; | |
| 725 } | |
| 726 | |
|
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727 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
|
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728 lrcf->nodelay = 1; |
| 2294 | 729 continue; |
| 730 } | |
| 731 | |
| 732 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 733 "invalid parameter \"%V\"", &value[i]); | |
| 980 | 734 return NGX_CONF_ERROR; |
| 735 } | |
| 736 | |
|
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parents:
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changeset
|
737 if (lrcf->shm_zone == NULL) { |
| 980 | 738 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 739 "\"%V\" must have \"zone\" parameter", |
| 740 &cmd->name); | |
| 980 | 741 return NGX_CONF_ERROR; |
| 742 } | |
| 743 | |
|
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|
744 if (lrcf->shm_zone->data == NULL) { |
|
1011
19118c44303f
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parents:
1002
diff
changeset
|
745 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 2294 | 746 "unknown limit_req_zone \"%V\"", |
|
2374
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parents:
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diff
changeset
|
747 &lrcf->shm_zone->name); |
|
1011
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
748 return NGX_CONF_ERROR; |
|
19118c44303f
test length of variable and number of connections
Igor Sysoev <igor@sysoev.ru>
parents:
1002
diff
changeset
|
749 } |
|
19118c44303f
test length of variable and number of connections
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parents:
1002
diff
changeset
|
750 |
|
2374
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parents:
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diff
changeset
|
751 lrcf->burst = burst * 1000; |
| 980 | 752 |
| 753 return NGX_CONF_OK; | |
| 754 } | |
| 755 | |
| 756 | |
| 757 static ngx_int_t | |
| 2294 | 758 ngx_http_limit_req_init(ngx_conf_t *cf) |
| 980 | 759 { |
| 760 ngx_http_handler_pt *h; | |
| 761 ngx_http_core_main_conf_t *cmcf; | |
| 762 | |
| 763 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 764 | |
| 765 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 766 if (h == NULL) { | |
| 767 return NGX_ERROR; | |
| 768 } | |
| 769 | |
| 2294 | 770 *h = ngx_http_limit_req_handler; |
| 980 | 771 |
| 772 return NGX_OK; | |
| 773 } |