Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_zone_module.c @ 2720:b3b8c66bd520
support attaching to an existent Win32 shared memory
| author | Igor Sysoev <igor@sysoev.ru> |
|---|---|
| date | Sat, 18 Apr 2009 19:27:28 +0000 |
| parents | d5896f6608e8 |
| children | c7d57b539248 |
| 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; | |
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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\"", | |
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194 &lzcf->shm_zone->shm.name); |
| 2373 | 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); | |
| 213 return NGX_HTTP_SERVICE_UNAVAILABLE; | |
| 214 } | |
| 215 | |
| 981 | 216 lz = (ngx_http_limit_zone_node_t *) &node->color; |
| 980 | 217 |
| 218 node->key = hash; | |
| 981 | 219 lz->len = (u_char) len; |
| 980 | 220 lz->conn = 1; |
| 221 ngx_memcpy(lz->data, vv->data, len); | |
| 222 | |
| 987 | 223 ngx_rbtree_insert(ctx->rbtree, node); |
| 980 | 224 |
| 225 done: | |
| 226 | |
| 227 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, | |
| 228 "limit zone: %08XD %d", node->key, lz->conn); | |
| 229 | |
| 230 ngx_shmtx_unlock(&shpool->mutex); | |
| 231 | |
| 232 cln->handler = ngx_http_limit_zone_cleanup; | |
| 233 lzcln = cln->data; | |
| 234 | |
| 235 lzcln->shm_zone = lzcf->shm_zone; | |
| 236 lzcln->node = node; | |
| 237 | |
| 238 return NGX_DECLINED; | |
| 239 } | |
| 240 | |
| 241 | |
| 242 static void | |
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243 ngx_http_limit_zone_rbtree_insert_value(ngx_rbtree_node_t *temp, |
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244 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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245 { |
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246 ngx_rbtree_node_t **p; |
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247 ngx_http_limit_zone_node_t *lzn, *lznt; |
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248 |
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249 for ( ;; ) { |
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250 |
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251 if (node->key < temp->key) { |
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252 |
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253 p = &temp->left; |
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254 |
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255 } else if (node->key > temp->key) { |
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256 |
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257 p = &temp->right; |
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258 |
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259 } else { /* node->key == temp->key */ |
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260 |
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261 lzn = (ngx_http_limit_zone_node_t *) &node->color; |
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262 lznt = (ngx_http_limit_zone_node_t *) &temp->color; |
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263 |
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264 p = (ngx_memn2cmp(lzn->data, lznt->data, lzn->len, lznt->len) < 0) |
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265 ? &temp->left : &temp->right; |
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266 } |
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267 |
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268 if (*p == sentinel) { |
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269 break; |
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270 } |
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271 |
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272 temp = *p; |
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273 } |
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274 |
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275 *p = node; |
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276 node->parent = temp; |
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277 node->left = sentinel; |
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278 node->right = sentinel; |
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279 ngx_rbt_red(node); |
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280 } |
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281 |
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282 |
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283 static void |
| 980 | 284 ngx_http_limit_zone_cleanup(void *data) |
| 285 { | |
| 286 ngx_http_limit_zone_cleanup_t *lzcln = data; | |
| 287 | |
| 288 ngx_slab_pool_t *shpool; | |
| 289 ngx_rbtree_node_t *node; | |
| 987 | 290 ngx_http_limit_zone_ctx_t *ctx; |
| 980 | 291 ngx_http_limit_zone_node_t *lz; |
| 292 | |
| 987 | 293 ctx = lzcln->shm_zone->data; |
| 980 | 294 shpool = (ngx_slab_pool_t *) lzcln->shm_zone->shm.addr; |
| 295 node = lzcln->node; | |
| 981 | 296 lz = (ngx_http_limit_zone_node_t *) &node->color; |
| 980 | 297 |
| 298 ngx_shmtx_lock(&shpool->mutex); | |
| 299 | |
| 300 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lzcln->shm_zone->shm.log, 0, | |
| 301 "limit zone cleanup: %08XD %d", node->key, lz->conn); | |
| 302 | |
| 303 lz->conn--; | |
| 304 | |
| 305 if (lz->conn == 0) { | |
| 987 | 306 ngx_rbtree_delete(ctx->rbtree, node); |
| 980 | 307 ngx_slab_free_locked(shpool, node); |
| 308 } | |
| 309 | |
| 310 ngx_shmtx_unlock(&shpool->mutex); | |
| 311 } | |
| 312 | |
| 313 | |
| 314 static ngx_int_t | |
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315 ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
| 980 | 316 { |
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317 ngx_http_limit_zone_ctx_t *octx = data; |
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318 |
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319 size_t len; |
| 987 | 320 ngx_slab_pool_t *shpool; |
| 321 ngx_rbtree_node_t *sentinel; | |
| 322 ngx_http_limit_zone_ctx_t *ctx; | |
| 980 | 323 |
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324 ctx = shm_zone->data; |
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325 |
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326 if (octx) { |
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327 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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328 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
| 1001 | 329 "limit_zone \"%V\" uses the \"%V\" variable " |
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330 "while previously it used the \"%V\" variable", |
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331 &shm_zone->shm.name, &ctx->var, &octx->var); |
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332 return NGX_ERROR; |
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333 } |
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334 |
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335 ctx->rbtree = octx->rbtree; |
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336 |
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337 return NGX_OK; |
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338 } |
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339 |
| 980 | 340 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
| 341 | |
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342 if (shm_zone->shm.exists) { |
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343 ctx->rbtree = shpool->data; |
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344 |
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345 return NGX_OK; |
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346 } |
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347 |
| 987 | 348 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); |
| 349 if (ctx->rbtree == NULL) { | |
| 980 | 350 return NGX_ERROR; |
| 351 } | |
| 352 | |
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353 shpool->data = ctx->rbtree; |
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354 |
| 980 | 355 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); |
| 356 if (sentinel == NULL) { | |
| 357 return NGX_ERROR; | |
| 358 } | |
| 359 | |
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360 ngx_rbtree_init(ctx->rbtree, sentinel, |
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361 ngx_http_limit_zone_rbtree_insert_value); |
| 980 | 362 |
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363 len = sizeof(" in limit_zone \"\"") + shm_zone->shm.name.len; |
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364 |
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365 shpool->log_ctx = ngx_slab_alloc(shpool, len); |
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366 if (shpool->log_ctx == NULL) { |
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367 return NGX_ERROR; |
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368 } |
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369 |
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370 ngx_sprintf(shpool->log_ctx, " in limit_zone \"%V\"%Z", |
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371 &shm_zone->shm.name); |
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372 |
| 980 | 373 return NGX_OK; |
| 374 } | |
| 375 | |
| 376 | |
| 377 static void * | |
| 378 ngx_http_limit_zone_create_conf(ngx_conf_t *cf) | |
| 379 { | |
| 380 ngx_http_limit_zone_conf_t *conf; | |
| 381 | |
| 382 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_conf_t)); | |
| 383 if (conf == NULL) { | |
| 384 return NGX_CONF_ERROR; | |
| 385 } | |
| 386 | |
| 387 /* | |
| 388 * set by ngx_pcalloc(): | |
| 389 * | |
| 390 * conf->shm_zone = NULL; | |
| 391 * conf->conn = 0; | |
| 392 */ | |
| 393 | |
| 394 return conf; | |
| 395 } | |
| 396 | |
| 397 | |
| 398 static char * | |
| 399 ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child) | |
| 400 { | |
| 401 ngx_http_limit_zone_conf_t *prev = parent; | |
| 402 ngx_http_limit_zone_conf_t *conf = child; | |
| 403 | |
| 404 if (conf->shm_zone == NULL) { | |
| 405 *conf = *prev; | |
| 406 } | |
| 407 | |
| 408 return NGX_CONF_OK; | |
| 409 } | |
| 410 | |
| 411 | |
| 412 static char * | |
| 413 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 414 { | |
| 987 | 415 ssize_t n; |
| 416 ngx_str_t *value; | |
| 417 ngx_shm_zone_t *shm_zone; | |
| 418 ngx_http_limit_zone_ctx_t *ctx; | |
| 980 | 419 |
| 420 value = cf->args->elts; | |
| 421 | |
| 987 | 422 if (value[2].data[0] != '$') { |
| 423 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 424 "invalid variable name \"%V\"", &value[2]); | |
| 425 return NGX_CONF_ERROR; | |
| 426 } | |
| 427 | |
| 428 value[2].len--; | |
| 429 value[2].data++; | |
| 430 | |
| 431 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t)); | |
| 432 if (ctx == NULL) { | |
| 433 return NGX_CONF_ERROR; | |
| 434 } | |
| 435 | |
| 436 ctx->index = ngx_http_get_variable_index(cf, &value[2]); | |
| 437 if (ctx->index == NGX_ERROR) { | |
| 438 return NGX_CONF_ERROR; | |
| 439 } | |
| 440 | |
| 441 ctx->var = value[2]; | |
| 442 | |
| 443 n = ngx_parse_size(&value[3]); | |
| 980 | 444 |
| 445 if (n == NGX_ERROR) { | |
| 446 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 987 | 447 "invalid size of limit_zone \"%V\"", &value[3]); |
| 980 | 448 return NGX_CONF_ERROR; |
| 449 } | |
| 450 | |
| 451 if (n < (ngx_int_t) (8 * ngx_pagesize)) { | |
| 452 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 453 "limit_zone \"%V\" is too small", &value[1]); | |
| 454 return NGX_CONF_ERROR; | |
| 455 } | |
| 456 | |
| 457 | |
| 458 shm_zone = ngx_shared_memory_add(cf, &value[1], n, | |
| 459 &ngx_http_limit_zone_module); | |
| 460 if (shm_zone == NULL) { | |
| 461 return NGX_CONF_ERROR; | |
| 462 } | |
| 463 | |
| 987 | 464 if (shm_zone->data) { |
| 465 ctx = shm_zone->data; | |
| 466 | |
| 467 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
| 468 "limit_zone \"%V\" is already bound to variable \"%V\"", | |
| 469 &value[1], &ctx->var); | |
| 470 return NGX_CONF_ERROR; | |
| 471 } | |
| 472 | |
| 980 | 473 shm_zone->init = ngx_http_limit_zone_init_zone; |
| 987 | 474 shm_zone->data = ctx; |
| 980 | 475 |
| 476 return NGX_CONF_OK; | |
| 477 } | |
| 478 | |
| 479 | |
| 480 static char * | |
| 481 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
| 482 { | |
| 483 ngx_http_limit_zone_conf_t *lzcf = conf; | |
| 484 | |
| 485 ngx_int_t n; | |
| 486 ngx_str_t *value; | |
| 487 | |
| 2372 | 488 if (lzcf->shm_zone) { |
| 489 return "is duplicate"; | |
| 490 } | |
| 491 | |
| 980 | 492 value = cf->args->elts; |
| 493 | |
| 987 | 494 lzcf->shm_zone = ngx_shared_memory_add(cf, &value[1], 0, |
| 495 &ngx_http_limit_zone_module); | |
| 496 if (lzcf->shm_zone == NULL) { | |
| 980 | 497 return NGX_CONF_ERROR; |
| 498 } | |
| 499 | |
| 987 | 500 n = ngx_atoi(value[2].data, value[2].len); |
| 501 if (n <= 0) { | |
| 980 | 502 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
| 987 | 503 "invalid number of connections \"%V\"", &value[2]); |
| 980 | 504 return NGX_CONF_ERROR; |
| 505 } | |
| 506 | |
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507 if (n > 65535) { |
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508 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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509 "connection limit must be less 65536"); |
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510 return NGX_CONF_ERROR; |
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511 } |
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512 |
| 980 | 513 lzcf->conn = n; |
| 514 | |
| 515 return NGX_CONF_OK; | |
| 516 } | |
| 517 | |
| 518 | |
| 519 static ngx_int_t | |
| 520 ngx_http_limit_zone_init(ngx_conf_t *cf) | |
| 521 { | |
| 522 ngx_http_handler_pt *h; | |
| 523 ngx_http_core_main_conf_t *cmcf; | |
| 524 | |
| 525 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
| 526 | |
| 527 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
| 528 if (h == NULL) { | |
| 529 return NGX_ERROR; | |
| 530 } | |
| 531 | |
| 532 *h = ngx_http_limit_zone_handler; | |
| 533 | |
| 534 return NGX_OK; | |
| 535 } |