Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 2611:2bce3f6416c6
improve ngx_slab_alloc() error logging
author | Igor Sysoev <igor@sysoev.ru> |
---|---|
date | Fri, 27 Mar 2009 17:00:42 +0000 |
parents | 29d89920a749 |
children | 038dc63b657a |
rev | line source |
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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); | |
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227 |
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228 ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0, |
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229 "could not allocate memory in zone \"%V\"", |
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230 &lrcf->shm_zone->name); |
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231 |
2294 | 232 return NGX_HTTP_SERVICE_UNAVAILABLE; |
233 } | |
234 } | |
235 | |
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236 lr = (ngx_http_limit_req_node_t *) &node->color; |
980 | 237 |
238 node->key = hash; | |
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239 lr->len = (u_char) len; |
2294 | 240 |
241 tp = ngx_timeofday(); | |
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242 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
2294 | 243 |
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244 lr->excess = 0; |
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245 ngx_memcpy(lr->data, vv->data, len); |
980 | 246 |
987 | 247 ngx_rbtree_insert(ctx->rbtree, node); |
980 | 248 |
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249 ngx_queue_insert_head(ctx->queue, &lr->queue); |
2294 | 250 |
980 | 251 done: |
252 | |
2294 | 253 ngx_shmtx_unlock(&ctx->shpool->mutex); |
980 | 254 |
255 return NGX_DECLINED; | |
256 } | |
257 | |
258 | |
259 static void | |
2294 | 260 ngx_http_limit_req_delay(ngx_http_request_t *r) |
261 { | |
262 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
263 "limit_req delay"); | |
264 | |
265 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { | |
266 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
267 return; | |
268 } | |
269 | |
270 r->read_event_handler = ngx_http_block_reading; | |
271 r->write_event_handler = ngx_http_core_run_phases; | |
272 | |
273 ngx_http_core_run_phases(r); | |
274 } | |
275 | |
276 | |
277 static void | |
278 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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279 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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280 { |
2294 | 281 ngx_rbtree_node_t **p; |
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282 ngx_http_limit_req_node_t *lrn, *lrnt; |
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283 |
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284 for ( ;; ) { |
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285 |
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286 if (node->key < temp->key) { |
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287 |
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288 p = &temp->left; |
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289 |
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290 } else if (node->key > temp->key) { |
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291 |
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292 p = &temp->right; |
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293 |
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294 } else { /* node->key == temp->key */ |
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295 |
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296 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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297 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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298 |
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299 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
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300 ? &temp->left : &temp->right; |
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301 } |
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302 |
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303 if (*p == sentinel) { |
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304 break; |
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305 } |
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306 |
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307 temp = *p; |
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308 } |
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309 |
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310 *p = node; |
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311 node->parent = temp; |
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312 node->left = sentinel; |
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313 node->right = sentinel; |
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314 ngx_rbt_red(node); |
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315 } |
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316 |
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317 |
2294 | 318 static ngx_int_t |
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319 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash, |
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320 u_char *data, size_t len, ngx_http_limit_req_node_t **lrp) |
980 | 321 { |
2313 | 322 ngx_int_t rc, excess; |
2294 | 323 ngx_time_t *tp; |
324 ngx_msec_t now; | |
325 ngx_msec_int_t ms; | |
326 ngx_rbtree_node_t *node, *sentinel; | |
327 ngx_http_limit_req_ctx_t *ctx; | |
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328 ngx_http_limit_req_node_t *lr; |
2294 | 329 |
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330 ctx = lrcf->shm_zone->data; |
2294 | 331 |
332 node = ctx->rbtree->root; | |
333 sentinel = ctx->rbtree->sentinel; | |
980 | 334 |
2294 | 335 while (node != sentinel) { |
336 | |
337 if (hash < node->key) { | |
338 node = node->left; | |
339 continue; | |
340 } | |
341 | |
342 if (hash > node->key) { | |
343 node = node->right; | |
344 continue; | |
345 } | |
346 | |
347 /* hash == node->key */ | |
348 | |
349 do { | |
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350 lr = (ngx_http_limit_req_node_t *) &node->color; |
980 | 351 |
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352 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len); |
2294 | 353 |
354 if (rc == 0) { | |
355 | |
356 tp = ngx_timeofday(); | |
980 | 357 |
2294 | 358 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); |
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359 ms = (ngx_msec_int_t) (now - lr->last); |
2294 | 360 |
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361 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000; |
2294 | 362 |
2313 | 363 if (excess < 0) { |
364 excess = 0; | |
2294 | 365 } |
366 | |
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367 lr->excess = excess; |
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368 lr->last = now; |
980 | 369 |
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370 *lrp = lr; |
2294 | 371 |
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372 if ((ngx_uint_t) excess > lrcf->burst) { |
2294 | 373 return NGX_BUSY; |
374 } | |
980 | 375 |
2313 | 376 if (excess) { |
2294 | 377 return NGX_AGAIN; |
378 } | |
980 | 379 |
2294 | 380 return NGX_OK; |
381 } | |
382 | |
383 node = (rc < 0) ? node->left : node->right; | |
384 | |
385 } while (node != sentinel && hash == node->key); | |
386 | |
387 break; | |
980 | 388 } |
389 | |
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390 *lrp = NULL; |
2294 | 391 |
392 return NGX_DECLINED; | |
393 } | |
394 | |
395 | |
396 static void | |
397 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
398 { | |
2313 | 399 ngx_int_t excess; |
2294 | 400 ngx_time_t *tp; |
401 ngx_msec_t now; | |
402 ngx_queue_t *q; | |
403 ngx_msec_int_t ms; | |
404 ngx_rbtree_node_t *node; | |
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405 ngx_http_limit_req_node_t *lr; |
2294 | 406 |
407 tp = ngx_timeofday(); | |
408 | |
409 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); | |
410 | |
411 /* | |
412 * n == 1 deletes one or two zero rate entries | |
413 * n == 0 deletes oldest entry by force | |
414 * and one or two zero rate entries | |
415 */ | |
416 | |
417 while (n < 3) { | |
418 | |
419 if (ngx_queue_empty(ctx->queue)) { | |
420 return; | |
421 } | |
422 | |
423 q = ngx_queue_last(ctx->queue); | |
424 | |
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425 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
2294 | 426 |
427 if (n++ != 0) { | |
428 | |
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429 ms = (ngx_msec_int_t) (now - lr->last); |
2294 | 430 ms = ngx_abs(ms); |
431 | |
432 if (ms < 60000) { | |
433 return; | |
434 } | |
435 | |
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436 excess = lr->excess - ctx->rate * ms / 1000; |
2294 | 437 |
2313 | 438 if (excess > 0) { |
2294 | 439 return; |
440 } | |
441 } | |
442 | |
443 ngx_queue_remove(q); | |
444 | |
445 node = (ngx_rbtree_node_t *) | |
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446 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
2294 | 447 |
448 ngx_rbtree_delete(ctx->rbtree, node); | |
449 | |
450 ngx_slab_free_locked(ctx->shpool, node); | |
451 } | |
980 | 452 } |
453 | |
454 | |
455 static ngx_int_t | |
2294 | 456 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 457 { |
2294 | 458 ngx_http_limit_req_ctx_t *octx = data; |
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459 |
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460 size_t len; |
2294 | 461 ngx_rbtree_node_t *sentinel; |
462 ngx_http_limit_req_ctx_t *ctx; | |
980 | 463 |
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464 ctx = shm_zone->data; |
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465 |
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466 if (octx) { |
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467 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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468 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
2294 | 469 "limit_req \"%V\" uses the \"%V\" variable " |
993
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470 "while previously it used the \"%V\" variable", |
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471 &shm_zone->name, &ctx->var, &octx->var); |
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472 return NGX_ERROR; |
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473 } |
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474 |
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475 ctx->rbtree = octx->rbtree; |
2294 | 476 ctx->queue = octx->queue; |
477 ctx->shpool = octx->shpool; | |
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478 |
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479 return NGX_OK; |
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480 } |
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481 |
2294 | 482 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
980 | 483 |
2294 | 484 ctx->rbtree = ngx_slab_alloc(ctx->shpool, sizeof(ngx_rbtree_t)); |
987 | 485 if (ctx->rbtree == NULL) { |
980 | 486 return NGX_ERROR; |
487 } | |
488 | |
2294 | 489 sentinel = ngx_slab_alloc(ctx->shpool, sizeof(ngx_rbtree_node_t)); |
980 | 490 if (sentinel == NULL) { |
491 return NGX_ERROR; | |
492 } | |
493 | |
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494 ngx_rbtree_init(ctx->rbtree, sentinel, |
2294 | 495 ngx_http_limit_req_rbtree_insert_value); |
496 | |
497 ctx->queue = ngx_slab_alloc(ctx->shpool, sizeof(ngx_queue_t)); | |
498 if (ctx->queue == NULL) { | |
499 return NGX_ERROR; | |
500 } | |
501 | |
502 ngx_queue_init(ctx->queue); | |
980 | 503 |
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504 len = sizeof(" in limit_req zone \"\"") + shm_zone->name.len; |
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505 |
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506 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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507 if (ctx->shpool->log_ctx == NULL) { |
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508 return NGX_ERROR; |
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509 } |
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510 |
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511 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
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512 &shm_zone->name); |
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513 |
980 | 514 return NGX_OK; |
515 } | |
516 | |
517 | |
518 static void * | |
2294 | 519 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
980 | 520 { |
2294 | 521 ngx_http_limit_req_conf_t *conf; |
980 | 522 |
2294 | 523 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
980 | 524 if (conf == NULL) { |
525 return NGX_CONF_ERROR; | |
526 } | |
527 | |
528 /* | |
529 * set by ngx_pcalloc(): | |
530 * | |
531 * conf->shm_zone = NULL; | |
2375 | 532 * conf->burst = 0; |
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533 * conf->nodelay = 0; |
980 | 534 */ |
535 | |
536 return conf; | |
537 } | |
538 | |
539 | |
540 static char * | |
2294 | 541 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
980 | 542 { |
2294 | 543 ngx_http_limit_req_conf_t *prev = parent; |
544 ngx_http_limit_req_conf_t *conf = child; | |
980 | 545 |
546 if (conf->shm_zone == NULL) { | |
547 *conf = *prev; | |
548 } | |
549 | |
550 return NGX_CONF_OK; | |
551 } | |
552 | |
553 | |
554 static char * | |
2294 | 555 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
980 | 556 { |
2294 | 557 u_char *p; |
558 size_t size, len; | |
559 ngx_str_t *value, name, s; | |
560 ngx_int_t rate, scale; | |
561 ngx_uint_t i; | |
562 ngx_shm_zone_t *shm_zone; | |
563 ngx_http_limit_req_ctx_t *ctx; | |
980 | 564 |
565 value = cf->args->elts; | |
566 | |
2294 | 567 ctx = NULL; |
568 size = 0; | |
569 rate = 1; | |
570 scale = 1; | |
571 name.len = 0; | |
572 | |
573 for (i = 1; i < cf->args->nelts; i++) { | |
574 | |
575 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
576 | |
577 name.data = value[i].data + 5; | |
578 | |
579 p = (u_char *) ngx_strchr(name.data, ':'); | |
580 | |
581 if (p) { | |
582 name.len = p - name.data; | |
583 | |
584 p++; | |
585 | |
586 s.len = value[i].data + value[i].len - p; | |
587 s.data = p; | |
588 | |
589 size = ngx_parse_size(&s); | |
590 if (size > 8191) { | |
591 continue; | |
592 } | |
593 } | |
594 | |
595 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
596 "invalid zone size \"%V\"", &value[i]); | |
597 return NGX_CONF_ERROR; | |
598 } | |
599 | |
600 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
601 | |
602 len = value[i].len; | |
603 p = value[i].data + len - 3; | |
987 | 604 |
2294 | 605 if (ngx_strncmp(p, "r/s", 3) == 0) { |
606 scale = 1; | |
607 len -= 3; | |
608 | |
609 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
610 scale = 60; | |
611 len -= 3; | |
612 } | |
613 | |
614 rate = ngx_atoi(value[i].data + 5, len - 5); | |
615 if (rate <= NGX_ERROR) { | |
616 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
617 "invalid rate \"%V\"", &value[i]); | |
618 return NGX_CONF_ERROR; | |
619 } | |
620 | |
621 continue; | |
622 } | |
623 | |
624 if (value[i].data[0] == '$') { | |
987 | 625 |
2294 | 626 value[i].len--; |
627 value[i].data++; | |
628 | |
629 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); | |
630 if (ctx == NULL) { | |
631 return NGX_CONF_ERROR; | |
632 } | |
633 | |
634 ctx->index = ngx_http_get_variable_index(cf, &value[i]); | |
635 if (ctx->index == NGX_ERROR) { | |
636 return NGX_CONF_ERROR; | |
637 } | |
638 | |
639 ctx->var = value[i]; | |
640 | |
641 continue; | |
642 } | |
643 | |
644 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
645 "invalid parameter \"%V\"", &value[i]); | |
987 | 646 return NGX_CONF_ERROR; |
647 } | |
648 | |
2294 | 649 if (name.len == 0 || size == 0) { |
650 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
651 "\"%V\" must have \"zone\" parameter", | |
652 &cmd->name); | |
987 | 653 return NGX_CONF_ERROR; |
654 } | |
655 | |
2294 | 656 if (ctx == NULL) { |
980 | 657 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 658 "no variable is defined for limit_req_zone \"%V\"", |
659 &cmd->name); | |
980 | 660 return NGX_CONF_ERROR; |
661 } | |
662 | |
2313 | 663 ctx->rate = rate * 1000 / scale; |
980 | 664 |
2294 | 665 shm_zone = ngx_shared_memory_add(cf, &name, size, |
666 &ngx_http_limit_req_module); | |
980 | 667 if (shm_zone == NULL) { |
668 return NGX_CONF_ERROR; | |
669 } | |
670 | |
987 | 671 if (shm_zone->data) { |
672 ctx = shm_zone->data; | |
673 | |
674 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
2294 | 675 "limit_req_zone \"%V\" is already bound to variable \"%V\"", |
676 &value[1], &ctx->var); | |
987 | 677 return NGX_CONF_ERROR; |
678 } | |
679 | |
2294 | 680 shm_zone->init = ngx_http_limit_req_init_zone; |
987 | 681 shm_zone->data = ctx; |
980 | 682 |
683 return NGX_CONF_OK; | |
684 } | |
685 | |
686 | |
687 static char * | |
2294 | 688 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
980 | 689 { |
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690 ngx_http_limit_req_conf_t *lrcf = conf; |
980 | 691 |
2300
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692 ngx_int_t burst; |
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693 ngx_str_t *value, s; |
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694 ngx_uint_t i; |
2294 | 695 |
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696 if (lrcf->shm_zone) { |
2294 | 697 return "is duplicate"; |
698 } | |
980 | 699 |
700 value = cf->args->elts; | |
701 | |
2294 | 702 burst = 0; |
703 | |
704 for (i = 1; i < cf->args->nelts; i++) { | |
705 | |
706 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
707 | |
708 s.len = value[i].len - 5; | |
709 s.data = value[i].data + 5; | |
710 | |
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711 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0, |
2294 | 712 &ngx_http_limit_req_module); |
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713 if (lrcf->shm_zone == NULL) { |
2294 | 714 return NGX_CONF_ERROR; |
715 } | |
716 | |
717 continue; | |
718 } | |
719 | |
720 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
721 | |
2300
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722 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
2294 | 723 if (burst <= 0) { |
724 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
725 "invalid burst rate \"%V\"", &value[i]); | |
726 return NGX_CONF_ERROR; | |
727 } | |
728 | |
729 continue; | |
730 } | |
731 | |
2300
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732 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { |
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733 lrcf->nodelay = 1; |
2294 | 734 continue; |
735 } | |
736 | |
737 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
738 "invalid parameter \"%V\"", &value[i]); | |
980 | 739 return NGX_CONF_ERROR; |
740 } | |
741 | |
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742 if (lrcf->shm_zone == NULL) { |
980 | 743 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 744 "\"%V\" must have \"zone\" parameter", |
745 &cmd->name); | |
980 | 746 return NGX_CONF_ERROR; |
747 } | |
748 | |
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749 if (lrcf->shm_zone->data == NULL) { |
1011
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750 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 751 "unknown limit_req_zone \"%V\"", |
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752 &lrcf->shm_zone->name); |
1011
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753 return NGX_CONF_ERROR; |
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754 } |
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755 |
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756 lrcf->burst = burst * 1000; |
980 | 757 |
758 return NGX_CONF_OK; | |
759 } | |
760 | |
761 | |
762 static ngx_int_t | |
2294 | 763 ngx_http_limit_req_init(ngx_conf_t *cf) |
980 | 764 { |
765 ngx_http_handler_pt *h; | |
766 ngx_http_core_main_conf_t *cmcf; | |
767 | |
768 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
769 | |
770 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
771 if (h == NULL) { | |
772 return NGX_ERROR; | |
773 } | |
774 | |
2294 | 775 *h = ngx_http_limit_req_handler; |
980 | 776 |
777 return NGX_OK; | |
778 } |