Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_limit_conn_module.c @ 4462:a73c63bdce32
Proxy: generic rewrite code from the "proxy_redirect" handlers moved to a
separate function with trivial optimization.
No functional changes.
author | Valentin Bartenev <vbart@nginx.com> |
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date | Mon, 13 Feb 2012 10:56:09 +0000 |
parents | 2d4ff8bd5649 |
children | 95ab6658654a |
rev | line source |
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980 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
980 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
13 typedef struct { | |
981 | 14 u_char color; |
15 u_char len; | |
980 | 16 u_short conn; |
17 u_char data[1]; | |
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18 } ngx_http_limit_conn_node_t; |
980 | 19 |
20 | |
21 typedef struct { | |
22 ngx_shm_zone_t *shm_zone; | |
23 ngx_rbtree_node_t *node; | |
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24 } ngx_http_limit_conn_cleanup_t; |
980 | 25 |
26 | |
27 typedef struct { | |
987 | 28 ngx_rbtree_t *rbtree; |
29 ngx_int_t index; | |
30 ngx_str_t var; | |
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31 } ngx_http_limit_conn_ctx_t; |
987 | 32 |
33 | |
34 typedef struct { | |
980 | 35 ngx_shm_zone_t *shm_zone; |
36 ngx_uint_t conn; | |
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37 } ngx_http_limit_conn_limit_t; |
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38 |
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39 |
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40 typedef struct { |
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41 ngx_array_t limits; |
3186 | 42 ngx_uint_t log_level; |
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43 } ngx_http_limit_conn_conf_t; |
980 | 44 |
45 | |
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46 static ngx_rbtree_node_t *ngx_http_limit_conn_lookup(ngx_rbtree_t *rbtree, |
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47 ngx_http_variable_value_t *vv, uint32_t hash); |
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48 static void ngx_http_limit_conn_cleanup(void *data); |
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49 static ngx_inline void ngx_http_limit_conn_cleanup_all(ngx_pool_t *pool); |
980 | 50 |
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51 static void *ngx_http_limit_conn_create_conf(ngx_conf_t *cf); |
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52 static char *ngx_http_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, |
980 | 53 void *child); |
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54 static char *ngx_http_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
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55 void *conf); |
980 | 56 static char *ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
57 void *conf); | |
58 static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, | |
59 void *conf); | |
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60 static ngx_int_t ngx_http_limit_conn_init(ngx_conf_t *cf); |
980 | 61 |
62 | |
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63 static ngx_conf_deprecated_t ngx_conf_deprecated_limit_zone = { |
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64 ngx_conf_deprecated, "limit_zone", "limit_conn_zone" |
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65 }; |
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66 |
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67 |
3186 | 68 static ngx_conf_enum_t ngx_http_limit_conn_log_levels[] = { |
69 { ngx_string("info"), NGX_LOG_INFO }, | |
70 { ngx_string("notice"), NGX_LOG_NOTICE }, | |
71 { ngx_string("warn"), NGX_LOG_WARN }, | |
72 { ngx_string("error"), NGX_LOG_ERR }, | |
73 { ngx_null_string, 0 } | |
74 }; | |
75 | |
76 | |
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77 static ngx_command_t ngx_http_limit_conn_commands[] = { |
980 | 78 |
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79 { ngx_string("limit_conn_zone"), |
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80 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE2, |
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81 ngx_http_limit_conn_zone, |
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82 0, |
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83 0, |
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84 NULL }, |
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85 |
980 | 86 { ngx_string("limit_zone"), |
987 | 87 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
980 | 88 ngx_http_limit_zone, |
89 0, | |
90 0, | |
91 NULL }, | |
92 | |
93 { ngx_string("limit_conn"), | |
987 | 94 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2, |
980 | 95 ngx_http_limit_conn, |
96 NGX_HTTP_LOC_CONF_OFFSET, | |
97 0, | |
98 NULL }, | |
99 | |
3186 | 100 { ngx_string("limit_conn_log_level"), |
101 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
102 ngx_conf_set_enum_slot, | |
103 NGX_HTTP_LOC_CONF_OFFSET, | |
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104 offsetof(ngx_http_limit_conn_conf_t, log_level), |
3186 | 105 &ngx_http_limit_conn_log_levels }, |
106 | |
980 | 107 ngx_null_command |
108 }; | |
109 | |
110 | |
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111 static ngx_http_module_t ngx_http_limit_conn_module_ctx = { |
980 | 112 NULL, /* preconfiguration */ |
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113 ngx_http_limit_conn_init, /* postconfiguration */ |
980 | 114 |
115 NULL, /* create main configuration */ | |
116 NULL, /* init main configuration */ | |
117 | |
118 NULL, /* create server configuration */ | |
119 NULL, /* merge server configuration */ | |
120 | |
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121 ngx_http_limit_conn_create_conf, /* create location configration */ |
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122 ngx_http_limit_conn_merge_conf /* merge location configration */ |
980 | 123 }; |
124 | |
125 | |
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126 ngx_module_t ngx_http_limit_conn_module = { |
980 | 127 NGX_MODULE_V1, |
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128 &ngx_http_limit_conn_module_ctx, /* module context */ |
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129 ngx_http_limit_conn_commands, /* module directives */ |
980 | 130 NGX_HTTP_MODULE, /* module type */ |
131 NULL, /* init master */ | |
132 NULL, /* init module */ | |
133 NULL, /* init process */ | |
134 NULL, /* init thread */ | |
135 NULL, /* exit thread */ | |
136 NULL, /* exit process */ | |
137 NULL, /* exit master */ | |
138 NGX_MODULE_V1_PADDING | |
139 }; | |
140 | |
141 | |
142 static ngx_int_t | |
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143 ngx_http_limit_conn_handler(ngx_http_request_t *r) |
980 | 144 { |
145 size_t len, n; | |
146 uint32_t hash; | |
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147 ngx_uint_t i; |
980 | 148 ngx_slab_pool_t *shpool; |
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149 ngx_rbtree_node_t *node; |
980 | 150 ngx_pool_cleanup_t *cln; |
151 ngx_http_variable_value_t *vv; | |
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152 ngx_http_limit_conn_ctx_t *ctx; |
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153 ngx_http_limit_conn_node_t *lc; |
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154 ngx_http_limit_conn_conf_t *lccf; |
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155 ngx_http_limit_conn_limit_t *limits; |
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156 ngx_http_limit_conn_cleanup_t *lccln; |
980 | 157 |
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158 if (r->main->limit_conn_set) { |
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159 return NGX_DECLINED; |
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160 } |
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161 |
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162 lccf = ngx_http_get_module_loc_conf(r, ngx_http_limit_conn_module); |
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163 limits = lccf->limits.elts; |
980 | 164 |
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165 for (i = 0; i < lccf->limits.nelts; i++) { |
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166 ctx = limits[i].shm_zone->data; |
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167 |
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168 vv = ngx_http_get_indexed_variable(r, ctx->index); |
980 | 169 |
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170 if (vv == NULL || vv->not_found) { |
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171 continue; |
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172 } |
980 | 173 |
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174 len = vv->len; |
980 | 175 |
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176 if (len == 0) { |
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177 continue; |
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178 } |
980 | 179 |
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180 if (len > 255) { |
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181 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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182 "the value of the \"%V\" variable " |
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183 "is more than 255 bytes: \"%v\"", |
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184 &ctx->var, vv); |
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185 continue; |
980 | 186 } |
187 | |
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188 r->main->limit_conn_set = 1; |
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189 |
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190 hash = ngx_crc32_short(vv->data, len); |
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191 |
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192 shpool = (ngx_slab_pool_t *) limits[i].shm_zone->shm.addr; |
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193 |
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194 ngx_shmtx_lock(&shpool->mutex); |
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195 |
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196 node = ngx_http_limit_conn_lookup(ctx->rbtree, vv, hash); |
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197 |
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198 if (node == NULL) { |
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199 |
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200 n = offsetof(ngx_rbtree_node_t, color) |
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201 + offsetof(ngx_http_limit_conn_node_t, data) |
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202 + len; |
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203 |
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204 node = ngx_slab_alloc_locked(shpool, n); |
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206 if (node == NULL) { |
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207 ngx_shmtx_unlock(&shpool->mutex); |
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208 ngx_http_limit_conn_cleanup_all(r->pool); |
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209 return NGX_HTTP_SERVICE_UNAVAILABLE; |
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210 } |
2373 | 211 |
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212 lc = (ngx_http_limit_conn_node_t *) &node->color; |
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213 |
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214 node->key = hash; |
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215 lc->len = (u_char) len; |
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216 lc->conn = 1; |
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217 ngx_memcpy(lc->data, vv->data, len); |
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218 |
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219 ngx_rbtree_insert(ctx->rbtree, node); |
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220 |
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221 } else { |
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222 |
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223 lc = (ngx_http_limit_conn_node_t *) &node->color; |
980 | 224 |
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225 if ((ngx_uint_t) lc->conn >= limits[i].conn) { |
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226 |
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227 ngx_shmtx_unlock(&shpool->mutex); |
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229 ngx_log_error(lccf->log_level, r->connection->log, 0, |
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230 "limiting connections by zone \"%V\"", |
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231 &limits[i].shm_zone->shm.name); |
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232 |
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233 ngx_http_limit_conn_cleanup_all(r->pool); |
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234 return NGX_HTTP_SERVICE_UNAVAILABLE; |
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235 } |
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236 |
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237 lc->conn++; |
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238 } |
980 | 239 |
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240 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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241 "limit zone: %08XD %d", node->key, lc->conn); |
980 | 242 |
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243 ngx_shmtx_unlock(&shpool->mutex); |
980 | 244 |
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245 cln = ngx_pool_cleanup_add(r->pool, |
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246 sizeof(ngx_http_limit_conn_cleanup_t)); |
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247 if (cln == NULL) { |
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248 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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249 } |
980 | 250 |
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251 cln->handler = ngx_http_limit_conn_cleanup; |
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252 lccln = cln->data; |
980 | 253 |
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254 lccln->shm_zone = limits[i].shm_zone; |
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255 lccln->node = node; |
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256 } |
980 | 257 |
258 return NGX_DECLINED; | |
259 } | |
260 | |
261 | |
262 static void | |
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263 ngx_http_limit_conn_rbtree_insert_value(ngx_rbtree_node_t *temp, |
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264 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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265 { |
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266 ngx_rbtree_node_t **p; |
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267 ngx_http_limit_conn_node_t *lcn, *lcnt; |
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268 |
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269 for ( ;; ) { |
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270 |
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271 if (node->key < temp->key) { |
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272 |
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273 p = &temp->left; |
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274 |
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275 } else if (node->key > temp->key) { |
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276 |
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277 p = &temp->right; |
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278 |
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279 } else { /* node->key == temp->key */ |
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280 |
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281 lcn = (ngx_http_limit_conn_node_t *) &node->color; |
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282 lcnt = (ngx_http_limit_conn_node_t *) &temp->color; |
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283 |
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284 p = (ngx_memn2cmp(lcn->data, lcnt->data, lcn->len, lcnt->len) < 0) |
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285 ? &temp->left : &temp->right; |
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286 } |
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287 |
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288 if (*p == sentinel) { |
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289 break; |
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290 } |
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291 |
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292 temp = *p; |
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293 } |
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294 |
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295 *p = node; |
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296 node->parent = temp; |
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297 node->left = sentinel; |
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298 node->right = sentinel; |
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299 ngx_rbt_red(node); |
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300 } |
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301 |
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302 |
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303 static ngx_rbtree_node_t * |
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304 ngx_http_limit_conn_lookup(ngx_rbtree_t *rbtree, ngx_http_variable_value_t *vv, |
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305 uint32_t hash) |
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306 { |
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307 ngx_int_t rc; |
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308 ngx_rbtree_node_t *node, *sentinel; |
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309 ngx_http_limit_conn_node_t *lcn; |
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310 |
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311 node = rbtree->root; |
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312 sentinel = rbtree->sentinel; |
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313 |
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314 while (node != sentinel) { |
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315 |
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316 if (hash < node->key) { |
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317 node = node->left; |
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318 continue; |
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319 } |
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320 |
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321 if (hash > node->key) { |
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322 node = node->right; |
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323 continue; |
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324 } |
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325 |
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326 /* hash == node->key */ |
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327 |
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328 do { |
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329 lcn = (ngx_http_limit_conn_node_t *) &node->color; |
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330 |
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331 rc = ngx_memn2cmp(vv->data, lcn->data, |
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332 (size_t) vv->len, (size_t) lcn->len); |
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333 if (rc == 0) { |
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334 return node; |
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335 } |
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336 |
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337 node = (rc < 0) ? node->left : node->right; |
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338 |
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339 } while (node != sentinel && hash == node->key); |
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340 |
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341 break; |
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342 } |
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343 |
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344 return NULL; |
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345 } |
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346 |
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347 |
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348 static void |
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349 ngx_http_limit_conn_cleanup(void *data) |
980 | 350 { |
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351 ngx_http_limit_conn_cleanup_t *lccln = data; |
980 | 352 |
353 ngx_slab_pool_t *shpool; | |
354 ngx_rbtree_node_t *node; | |
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355 ngx_http_limit_conn_ctx_t *ctx; |
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356 ngx_http_limit_conn_node_t *lc; |
980 | 357 |
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358 ctx = lccln->shm_zone->data; |
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359 shpool = (ngx_slab_pool_t *) lccln->shm_zone->shm.addr; |
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360 node = lccln->node; |
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361 lc = (ngx_http_limit_conn_node_t *) &node->color; |
980 | 362 |
363 ngx_shmtx_lock(&shpool->mutex); | |
364 | |
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365 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, lccln->shm_zone->shm.log, 0, |
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366 "limit zone cleanup: %08XD %d", node->key, lc->conn); |
980 | 367 |
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368 lc->conn--; |
980 | 369 |
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370 if (lc->conn == 0) { |
987 | 371 ngx_rbtree_delete(ctx->rbtree, node); |
980 | 372 ngx_slab_free_locked(shpool, node); |
373 } | |
374 | |
375 ngx_shmtx_unlock(&shpool->mutex); | |
376 } | |
377 | |
378 | |
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379 static ngx_inline void |
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380 ngx_http_limit_conn_cleanup_all(ngx_pool_t *pool) |
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381 { |
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382 ngx_pool_cleanup_t *cln; |
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383 |
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384 cln = pool->cleanup; |
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385 |
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386 while (cln && cln->handler == ngx_http_limit_conn_cleanup) { |
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387 ngx_http_limit_conn_cleanup(cln->data); |
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388 cln = cln->next; |
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389 } |
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390 |
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391 pool->cleanup = cln; |
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392 } |
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393 |
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394 |
980 | 395 static ngx_int_t |
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396 ngx_http_limit_conn_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 397 { |
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398 ngx_http_limit_conn_ctx_t *octx = data; |
993
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399 |
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400 size_t len; |
987 | 401 ngx_slab_pool_t *shpool; |
402 ngx_rbtree_node_t *sentinel; | |
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403 ngx_http_limit_conn_ctx_t *ctx; |
980 | 404 |
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405 ctx = shm_zone->data; |
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406 |
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407 if (octx) { |
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408 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) { |
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409 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
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410 "limit_conn_zone \"%V\" uses the \"%V\" variable " |
993
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411 "while previously it used the \"%V\" variable", |
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412 &shm_zone->shm.name, &ctx->var, &octx->var); |
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413 return NGX_ERROR; |
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414 } |
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415 |
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416 ctx->rbtree = octx->rbtree; |
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417 |
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418 return NGX_OK; |
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419 } |
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420 |
980 | 421 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
422 | |
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423 if (shm_zone->shm.exists) { |
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424 ctx->rbtree = shpool->data; |
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425 |
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426 return NGX_OK; |
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427 } |
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428 |
987 | 429 ctx->rbtree = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_t)); |
430 if (ctx->rbtree == NULL) { | |
980 | 431 return NGX_ERROR; |
432 } | |
433 | |
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434 shpool->data = ctx->rbtree; |
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435 |
980 | 436 sentinel = ngx_slab_alloc(shpool, sizeof(ngx_rbtree_node_t)); |
437 if (sentinel == NULL) { | |
438 return NGX_ERROR; | |
439 } | |
440 | |
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441 ngx_rbtree_init(ctx->rbtree, sentinel, |
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442 ngx_http_limit_conn_rbtree_insert_value); |
980 | 443 |
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444 len = sizeof(" in limit_conn_zone \"\"") + shm_zone->shm.name.len; |
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445 |
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446 shpool->log_ctx = ngx_slab_alloc(shpool, len); |
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447 if (shpool->log_ctx == NULL) { |
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448 return NGX_ERROR; |
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449 } |
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450 |
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451 ngx_sprintf(shpool->log_ctx, " in limit_conn_zone \"%V\"%Z", |
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452 &shm_zone->shm.name); |
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453 |
980 | 454 return NGX_OK; |
455 } | |
456 | |
457 | |
458 static void * | |
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459 ngx_http_limit_conn_create_conf(ngx_conf_t *cf) |
980 | 460 { |
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461 ngx_http_limit_conn_conf_t *conf; |
980 | 462 |
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463 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_conn_conf_t)); |
980 | 464 if (conf == NULL) { |
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465 return NULL; |
980 | 466 } |
467 | |
468 /* | |
469 * set by ngx_pcalloc(): | |
470 * | |
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471 * conf->limits.elts = NULL; |
980 | 472 */ |
473 | |
3186 | 474 conf->log_level = NGX_CONF_UNSET_UINT; |
475 | |
980 | 476 return conf; |
477 } | |
478 | |
479 | |
480 static char * | |
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481 ngx_http_limit_conn_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
980 | 482 { |
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483 ngx_http_limit_conn_conf_t *prev = parent; |
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484 ngx_http_limit_conn_conf_t *conf = child; |
980 | 485 |
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486 if (conf->limits.elts == NULL) { |
4380
7697412a0921
Fixed limit_conn_log_level/limit_req_log_level inheritance.
Valentin Bartenev <vbart@nginx.com>
parents:
4280
diff
changeset
|
487 conf->limits = prev->limits; |
980 | 488 } |
489 | |
3186 | 490 ngx_conf_merge_uint_value(conf->log_level, prev->log_level, NGX_LOG_ERR); |
491 | |
980 | 492 return NGX_CONF_OK; |
493 } | |
494 | |
495 | |
496 static char * | |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
497 ngx_http_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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diff
changeset
|
498 { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
499 u_char *p; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
500 ssize_t size; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
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diff
changeset
|
501 ngx_str_t *value, name, s; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
502 ngx_uint_t i; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
503 ngx_shm_zone_t *shm_zone; |
4280
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
504 ngx_http_limit_conn_ctx_t *ctx; |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
505 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
4271
diff
changeset
|
506 value = cf->args->elts; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
507 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
508 ctx = NULL; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
4271
diff
changeset
|
509 size = 0; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
510 name.len = 0; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
511 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
512 for (i = 1; i < cf->args->nelts; i++) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
513 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
514 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
515 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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diff
changeset
|
516 name.data = value[i].data + 5; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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4271
diff
changeset
|
517 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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diff
changeset
|
518 p = (u_char *) ngx_strchr(name.data, ':'); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
519 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
520 if (p == NULL) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
521 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
4271
diff
changeset
|
522 "invalid zone size \"%V\"", &value[i]); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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diff
changeset
|
523 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
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diff
changeset
|
524 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
525 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
526 name.len = p - name.data; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
527 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
528 s.data = p + 1; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
529 s.len = value[i].data + value[i].len - s.data; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
530 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
531 size = ngx_parse_size(&s); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
532 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
533 if (size == NGX_ERROR) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
534 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
535 "invalid zone size \"%V\"", &value[i]); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
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diff
changeset
|
536 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
537 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
538 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
539 if (size < (ssize_t) (8 * ngx_pagesize)) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
4271
diff
changeset
|
540 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
4271
diff
changeset
|
541 "zone \"%V\" is too small", &value[i]); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
542 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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diff
changeset
|
543 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
544 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
545 continue; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
546 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
547 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
548 if (value[i].data[0] == '$') { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
549 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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4271
diff
changeset
|
550 value[i].len--; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
551 value[i].data++; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
4271
diff
changeset
|
552 |
4280
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
553 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_conn_ctx_t)); |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
554 if (ctx == NULL) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
555 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
4271
diff
changeset
|
556 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
557 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
558 ctx->index = ngx_http_get_variable_index(cf, &value[i]); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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4271
diff
changeset
|
559 if (ctx->index == NGX_ERROR) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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4271
diff
changeset
|
560 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
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parents:
4271
diff
changeset
|
561 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
562 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
563 ctx->var = value[i]; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
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4271
diff
changeset
|
564 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
565 continue; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
566 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
567 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
568 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
569 "invalid parameter \"%V\"", &value[i]); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
570 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
571 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
572 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
573 if (name.len == 0) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
574 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
575 "\"%V\" must have \"zone\" parameter", |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
576 &cmd->name); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
577 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
578 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
579 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
580 if (ctx == NULL) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
581 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
582 "no variable is defined for %V \"%V\"", |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
583 &cmd->name, &name); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
584 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
585 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
586 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
587 shm_zone = ngx_shared_memory_add(cf, &name, size, |
4280
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
588 &ngx_http_limit_conn_module); |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
589 if (shm_zone == NULL) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
590 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
591 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
592 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
593 if (shm_zone->data) { |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
594 ctx = shm_zone->data; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
595 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
596 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
597 "%V \"%V\" is already bound to variable \"%V\"", |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
598 &cmd->name, &name, &ctx->var); |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
599 return NGX_CONF_ERROR; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
600 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
601 |
4280
91874133fb27
Renamed ngx_http_limit_zone_module to ngx_http_limit_conn_module.
Valentin Bartenev <vbart@nginx.com>
parents:
4272
diff
changeset
|
602 shm_zone->init = ngx_http_limit_conn_init_zone; |
4272
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
603 shm_zone->data = ctx; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
604 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
605 return NGX_CONF_OK; |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
606 } |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
607 |
260d591cb6a3
Limit zone: added the "limit_conn_zone" directive.
Valentin Bartenev <vbart@nginx.com>
parents:
4271
diff
changeset
|
608 |
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609 static char * |
980 | 610 ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
611 { | |
987 | 612 ssize_t n; |
613 ngx_str_t *value; | |
614 ngx_shm_zone_t *shm_zone; | |
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615 ngx_http_limit_conn_ctx_t *ctx; |
980 | 616 |
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617 ngx_conf_deprecated(cf, &ngx_conf_deprecated_limit_zone, NULL); |
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618 |
980 | 619 value = cf->args->elts; |
620 | |
987 | 621 if (value[2].data[0] != '$') { |
622 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
623 "invalid variable name \"%V\"", &value[2]); | |
624 return NGX_CONF_ERROR; | |
625 } | |
626 | |
627 value[2].len--; | |
628 value[2].data++; | |
629 | |
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630 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_conn_ctx_t)); |
987 | 631 if (ctx == NULL) { |
632 return NGX_CONF_ERROR; | |
633 } | |
634 | |
635 ctx->index = ngx_http_get_variable_index(cf, &value[2]); | |
636 if (ctx->index == NGX_ERROR) { | |
637 return NGX_CONF_ERROR; | |
638 } | |
639 | |
640 ctx->var = value[2]; | |
641 | |
642 n = ngx_parse_size(&value[3]); | |
980 | 643 |
644 if (n == NGX_ERROR) { | |
645 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
987 | 646 "invalid size of limit_zone \"%V\"", &value[3]); |
980 | 647 return NGX_CONF_ERROR; |
648 } | |
649 | |
650 if (n < (ngx_int_t) (8 * ngx_pagesize)) { | |
651 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
652 "limit_zone \"%V\" is too small", &value[1]); | |
653 return NGX_CONF_ERROR; | |
654 } | |
655 | |
656 | |
657 shm_zone = ngx_shared_memory_add(cf, &value[1], n, | |
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658 &ngx_http_limit_conn_module); |
980 | 659 if (shm_zone == NULL) { |
660 return NGX_CONF_ERROR; | |
661 } | |
662 | |
987 | 663 if (shm_zone->data) { |
664 ctx = shm_zone->data; | |
665 | |
666 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
667 "limit_zone \"%V\" is already bound to variable \"%V\"", | |
668 &value[1], &ctx->var); | |
669 return NGX_CONF_ERROR; | |
670 } | |
671 | |
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672 shm_zone->init = ngx_http_limit_conn_init_zone; |
987 | 673 shm_zone->data = ctx; |
980 | 674 |
675 return NGX_CONF_OK; | |
676 } | |
677 | |
678 | |
679 static char * | |
680 ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
681 { | |
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682 ngx_shm_zone_t *shm_zone; |
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683 ngx_http_limit_conn_conf_t *lccf = conf; |
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684 ngx_http_limit_conn_limit_t *limit, *limits; |
980 | 685 |
686 ngx_str_t *value; | |
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687 ngx_int_t n; |
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688 ngx_uint_t i; |
2372 | 689 |
980 | 690 value = cf->args->elts; |
691 | |
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692 shm_zone = ngx_shared_memory_add(cf, &value[1], 0, |
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693 &ngx_http_limit_conn_module); |
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694 if (shm_zone == NULL) { |
980 | 695 return NGX_CONF_ERROR; |
696 } | |
697 | |
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698 limits = lccf->limits.elts; |
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699 |
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700 if (limits == NULL) { |
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701 if (ngx_array_init(&lccf->limits, cf->pool, 1, |
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702 sizeof(ngx_http_limit_conn_limit_t)) |
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703 != NGX_OK) |
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704 { |
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705 return NGX_CONF_ERROR; |
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706 } |
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707 } |
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708 |
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709 for (i = 0; i < lccf->limits.nelts; i++) { |
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710 if (shm_zone == limits[i].shm_zone) { |
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711 return "is duplicate"; |
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712 } |
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713 } |
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714 |
987 | 715 n = ngx_atoi(value[2].data, value[2].len); |
716 if (n <= 0) { | |
980 | 717 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
987 | 718 "invalid number of connections \"%V\"", &value[2]); |
980 | 719 return NGX_CONF_ERROR; |
720 } | |
721 | |
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722 if (n > 65535) { |
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723 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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724 "connection limit must be less 65536"); |
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725 return NGX_CONF_ERROR; |
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726 } |
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727 |
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728 limit = ngx_array_push(&lccf->limits); |
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729 limit->conn = n; |
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730 limit->shm_zone = shm_zone; |
980 | 731 |
732 return NGX_CONF_OK; | |
733 } | |
734 | |
735 | |
736 static ngx_int_t | |
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737 ngx_http_limit_conn_init(ngx_conf_t *cf) |
980 | 738 { |
739 ngx_http_handler_pt *h; | |
740 ngx_http_core_main_conf_t *cmcf; | |
741 | |
742 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
743 | |
744 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
745 if (h == NULL) { | |
746 return NGX_ERROR; | |
747 } | |
748 | |
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749 *h = ngx_http_limit_conn_handler; |
980 | 750 |
751 return NGX_OK; | |
752 } |