Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_zone_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 | f4603d71f532 |
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; |
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; | |
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107 ngx_int_t rc; |
980 | 108 ngx_slab_pool_t *shpool; |
109 ngx_rbtree_node_t *node, *sentinel; | |
110 ngx_pool_cleanup_t *cln; | |
111 ngx_http_variable_value_t *vv; | |
987 | 112 ngx_http_limit_zone_ctx_t *ctx; |
980 | 113 ngx_http_limit_zone_node_t *lz; |
114 ngx_http_limit_zone_conf_t *lzcf; | |
115 ngx_http_limit_zone_cleanup_t *lzcln; | |
116 | |
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117 if (r->main->limit_zone_set) { |
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118 return NGX_DECLINED; |
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119 } |
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120 |
980 | 121 lzcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_zone_module); |
122 | |
123 if (lzcf->shm_zone == NULL) { | |
124 return NGX_DECLINED; | |
125 } | |
126 | |
987 | 127 ctx = lzcf->shm_zone->data; |
128 | |
129 vv = ngx_http_get_indexed_variable(r, ctx->index); | |
980 | 130 |
131 if (vv == NULL || vv->not_found) { | |
132 return NGX_DECLINED; | |
133 } | |
134 | |
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135 len = vv->len; |
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136 |
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137 if (len == 0) { |
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138 return NGX_DECLINED; |
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139 } |
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140 |
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141 if (len > 255) { |
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142 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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143 "the value of the \"%V\" variable " |
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144 "is more than 255 bytes: \"%v\"", |
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145 &ctx->var, vv); |
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146 return NGX_DECLINED; |
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147 } |
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148 |
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149 r->main->limit_zone_set = 1; |
980 | 150 |
151 hash = ngx_crc32_short(vv->data, len); | |
152 | |
153 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_limit_zone_cleanup_t)); | |
154 if (cln == NULL) { | |
155 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
156 } | |
157 | |
158 shpool = (ngx_slab_pool_t *) lzcf->shm_zone->shm.addr; | |
159 | |
160 ngx_shmtx_lock(&shpool->mutex); | |
161 | |
987 | 162 node = ctx->rbtree->root; |
163 sentinel = ctx->rbtree->sentinel; | |
980 | 164 |
165 while (node != sentinel) { | |
166 | |
167 if (hash < node->key) { | |
168 node = node->left; | |
169 continue; | |
170 } | |
171 | |
172 if (hash > node->key) { | |
173 node = node->right; | |
174 continue; | |
175 } | |
176 | |
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177 /* hash == node->key */ |
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178 |
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179 do { |
981 | 180 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 181 |
1036 | 182 rc = ngx_memn2cmp(vv->data, lz->data, len, (size_t) lz->len); |
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183 |
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184 if (rc == 0) { |
981 | 185 if ((ngx_uint_t) lz->conn < lzcf->conn) { |
980 | 186 lz->conn++; |
187 goto done; | |
188 } | |
189 | |
190 ngx_shmtx_unlock(&shpool->mutex); | |
191 | |
2373 | 192 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
193 "limiting connections by zone \"%V\"", | |
194 &lzcf->shm_zone->name); | |
195 | |
980 | 196 return NGX_HTTP_SERVICE_UNAVAILABLE; |
197 } | |
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198 |
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199 node = (rc < 0) ? node->left : node->right; |
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200 |
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201 } while (node != sentinel && hash == node->key); |
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202 |
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203 break; |
980 | 204 } |
205 | |
981 | 206 n = offsetof(ngx_rbtree_node_t, color) |
980 | 207 + offsetof(ngx_http_limit_zone_node_t, data) |
208 + len; | |
209 | |
210 node = ngx_slab_alloc_locked(shpool, n); | |
211 if (node == NULL) { | |
212 ngx_shmtx_unlock(&shpool->mutex); | |
2373 | 213 |
214 ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0, | |
215 "could not allocate memory in zone \"%V\"", | |
216 &lzcf->shm_zone->name); | |
217 | |
980 | 218 return NGX_HTTP_SERVICE_UNAVAILABLE; |
219 } | |
220 | |
981 | 221 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 222 |
223 node->key = hash; | |
981 | 224 lz->len = (u_char) len; |
980 | 225 lz->conn = 1; |
226 ngx_memcpy(lz->data, vv->data, len); | |
227 | |
987 | 228 ngx_rbtree_insert(ctx->rbtree, node); |
980 | 229 |
230 done: | |
231 | |
232 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
233 "limit zone: %08XD %d", node->key, lz->conn); | |
234 | |
235 ngx_shmtx_unlock(&shpool->mutex); | |
236 | |
237 cln->handler = ngx_http_limit_zone_cleanup; | |
238 lzcln = cln->data; | |
239 | |
240 lzcln->shm_zone = lzcf->shm_zone; | |
241 lzcln->node = node; | |
242 | |
243 return NGX_DECLINED; | |
244 } | |
245 | |
246 | |
247 static void | |
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248 ngx_http_limit_zone_rbtree_insert_value(ngx_rbtree_node_t *temp, |
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249 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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250 { |
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251 ngx_rbtree_node_t **p; |
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252 ngx_http_limit_zone_node_t *lzn, *lznt; |
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253 |
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254 for ( ;; ) { |
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255 |
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256 if (node->key < temp->key) { |
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257 |
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258 p = &temp->left; |
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259 |
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260 } else if (node->key > temp->key) { |
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261 |
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262 p = &temp->right; |
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263 |
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264 } else { /* node->key == temp->key */ |
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265 |
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266 lzn = (ngx_http_limit_zone_node_t *) &node->color; |
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267 lznt = (ngx_http_limit_zone_node_t *) &temp->color; |
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268 |
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269 p = (ngx_memn2cmp(lzn->data, lznt->data, lzn->len, lznt->len) < 0) |
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270 ? &temp->left : &temp->right; |
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271 } |
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272 |
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273 if (*p == sentinel) { |
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274 break; |
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275 } |
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276 |
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277 temp = *p; |
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278 } |
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279 |
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280 *p = node; |
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281 node->parent = temp; |
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282 node->left = sentinel; |
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283 node->right = sentinel; |
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284 ngx_rbt_red(node); |
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285 } |
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286 |
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287 |
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288 static void |
980 | 289 ngx_http_limit_zone_cleanup(void *data) |
290 { | |
291 ngx_http_limit_zone_cleanup_t *lzcln = data; | |
292 | |
293 ngx_slab_pool_t *shpool; | |
294 ngx_rbtree_node_t *node; | |
987 | 295 ngx_http_limit_zone_ctx_t *ctx; |
980 | 296 ngx_http_limit_zone_node_t *lz; |
297 | |
987 | 298 ctx = lzcln->shm_zone->data; |
980 | 299 shpool = (ngx_slab_pool_t *) lzcln->shm_zone->shm.addr; |
300 node = lzcln->node; | |
981 | 301 lz = (ngx_http_limit_zone_node_t *) &node->color; |
980 | 302 |
303 ngx_shmtx_lock(&shpool->mutex); | |
304 | |
305 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lzcln->shm_zone->shm.log, 0, | |
306 "limit zone cleanup: %08XD %d", node->key, lz->conn); | |
307 | |
308 lz->conn--; | |
309 | |
310 if (lz->conn == 0) { | |
987 | 311 ngx_rbtree_delete(ctx->rbtree, node); |
980 | 312 ngx_slab_free_locked(shpool, node); |
313 } | |
314 | |
315 ngx_shmtx_unlock(&shpool->mutex); | |
316 } | |
317 | |
318 | |
319 static ngx_int_t | |
993
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320 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 321 { |
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322 ngx_http_limit_zone_ctx_t *octx = data; |
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323 |
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324 size_t len; |
987 | 325 ngx_slab_pool_t *shpool; |
326 ngx_rbtree_node_t *sentinel; | |
327 ngx_http_limit_zone_ctx_t *ctx; | |
980 | 328 |
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329 ctx = shm_zone->data; |
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330 |
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331 if (octx) { |
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332 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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333 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
1001 | 334 "limit_zone \"%V\" uses the \"%V\" variable " |
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335 "while previously it used the \"%V\" variable", |
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336 &shm_zone->name, &ctx->var, &octx->var); |
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337 return NGX_ERROR; |
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338 } |
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339 |
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340 ctx->rbtree = octx->rbtree; |
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341 |
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342 return NGX_OK; |
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343 } |
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344 |
980 | 345 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
346 | |
987 | 347 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); |
348 if (ctx->rbtree == NULL) { | |
980 | 349 return NGX_ERROR; |
350 } | |
351 | |
352 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); | |
353 if (sentinel == NULL) { | |
354 return NGX_ERROR; | |
355 } | |
356 | |
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357 ngx_rbtree_init(ctx->rbtree, sentinel, |
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358 ngx_http_limit_zone_rbtree_insert_value); |
980 | 359 |
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360 len = sizeof(" in limit_zone \"\"") + shm_zone->name.len; |
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361 |
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362 shpool->log_ctx = ngx_slab_alloc(shpool, len); |
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363 if (shpool->log_ctx == NULL) { |
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364 return NGX_ERROR; |
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365 } |
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366 |
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367 ngx_sprintf(shpool->log_ctx, " in limit_zone \"%V\"%Z", &shm_zone->name); |
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368 |
980 | 369 return NGX_OK; |
370 } | |
371 | |
372 | |
373 static void * | |
374 ngx_http_limit_zone_create_conf(ngx_conf_t *cf) | |
375 { | |
376 ngx_http_limit_zone_conf_t *conf; | |
377 | |
378 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t)); | |
379 if (conf == NULL) { | |
380 return NGX_CONF_ERROR; | |
381 } | |
382 | |
383 /* | |
384 * set by ngx_pcalloc(): | |
385 * | |
386 * conf->shm_zone = NULL; | |
387 * conf->conn = 0; | |
388 */ | |
389 | |
390 return conf; | |
391 } | |
392 | |
393 | |
394 static char * | |
395 ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
396 { | |
397 ngx_http_limit_zone_conf_t *prev = parent; | |
398 ngx_http_limit_zone_conf_t *conf = child; | |
399 | |
400 if (conf->shm_zone == NULL) { | |
401 *conf = *prev; | |
402 } | |
403 | |
404 return NGX_CONF_OK; | |
405 } | |
406 | |
407 | |
408 static char * | |
409 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
410 { | |
987 | 411 ssize_t n; |
412 ngx_str_t *value; | |
413 ngx_shm_zone_t *shm_zone; | |
414 ngx_http_limit_zone_ctx_t *ctx; | |
980 | 415 |
416 value = cf->args->elts; | |
417 | |
987 | 418 if (value[2].data[0] != '$') { |
419 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
420 "invalid variable name \"%V\"", &value[2]); | |
421 return NGX_CONF_ERROR; | |
422 } | |
423 | |
424 value[2].len--; | |
425 value[2].data++; | |
426 | |
427 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t)); | |
428 if (ctx == NULL) { | |
429 return NGX_CONF_ERROR; | |
430 } | |
431 | |
432 ctx->index = ngx_http_get_variable_index(cf, &value[2]); | |
433 if (ctx->index == NGX_ERROR) { | |
434 return NGX_CONF_ERROR; | |
435 } | |
436 | |
437 ctx->var = value[2]; | |
438 | |
439 n = ngx_parse_size(&value[3]); | |
980 | 440 |
441 if (n == NGX_ERROR) { | |
442 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
987 | 443 "invalid size of limit_zone \"%V\"", &value[3]); |
980 | 444 return NGX_CONF_ERROR; |
445 } | |
446 | |
447 if (n < (ngx_int_t) (8 * ngx_pagesize)) { | |
448 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
449 "limit_zone \"%V\" is too small", &value[1]); | |
450 return NGX_CONF_ERROR; | |
451 } | |
452 | |
453 | |
454 shm_zone = ngx_shared_memory_add(cf, &value[1], n, | |
455 &ngx_http_limit_zone_module); | |
456 if (shm_zone == NULL) { | |
457 return NGX_CONF_ERROR; | |
458 } | |
459 | |
987 | 460 if (shm_zone->data) { |
461 ctx = shm_zone->data; | |
462 | |
463 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
464 "limit_zone \"%V\" is already bound to variable \"%V\"", | |
465 &value[1], &ctx->var); | |
466 return NGX_CONF_ERROR; | |
467 } | |
468 | |
980 | 469 shm_zone->init = ngx_http_limit_zone_init_zone; |
987 | 470 shm_zone->data = ctx; |
980 | 471 |
472 return NGX_CONF_OK; | |
473 } | |
474 | |
475 | |
476 static char * | |
477 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
478 { | |
479 ngx_http_limit_zone_conf_t *lzcf = conf; | |
480 | |
481 ngx_int_t n; | |
482 ngx_str_t *value; | |
483 | |
2372 | 484 if (lzcf->shm_zone) { |
485 return "is duplicate"; | |
486 } | |
487 | |
980 | 488 value = cf->args->elts; |
489 | |
987 | 490 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[1], 0, |
491 &ngx_http_limit_zone_module); | |
492 if (lzcf->shm_zone == NULL) { | |
980 | 493 return NGX_CONF_ERROR; |
494 } | |
495 | |
987 | 496 n = ngx_atoi(value[2].data, value[2].len); |
497 if (n <= 0) { | |
980 | 498 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
987 | 499 "invalid number of connections \"%V\"", &value[2]); |
980 | 500 return NGX_CONF_ERROR; |
501 } | |
502 | |
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503 if (n > 65535) { |
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504 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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505 "connection limit must be less 65536"); |
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506 return NGX_CONF_ERROR; |
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507 } |
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508 |
980 | 509 lzcf->conn = n; |
510 | |
511 return NGX_CONF_OK; | |
512 } | |
513 | |
514 | |
515 static ngx_int_t | |
516 ngx_http_limit_zone_init(ngx_conf_t *cf) | |
517 { | |
518 ngx_http_handler_pt *h; | |
519 ngx_http_core_main_conf_t *cmcf; | |
520 | |
521 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
522 | |
523 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
524 if (h == NULL) { | |
525 return NGX_ERROR; | |
526 } | |
527 | |
528 *h = ngx_http_limit_zone_handler; | |
529 | |
530 return NGX_OK; | |
531 } |