Mercurial > hg > nginx
annotate src/http/modules/ngx_http_limit_req_module.c @ 7281:bd6563e81cea
Limit req: improved handling of negative times.
Negative times can appear since workers only update time on an event
loop iteration start. If a worker was blocked for a long time during
an event loop iteration, it is possible that another worker already
updated the time stored in the node. As such, time since last update
of the node (ms) will be negative.
Previous code used ngx_abs(ms) in the calculations. That is, negative
times were effectively treated as positive ones. As a result, it was
not possible to maintain high request rates, where the same node can be
updated multiple times from during an event loop iteration.
In particular, this affected setups with many SSL handshakes, see
http://mailman.nginx.org/pipermail/nginx/2018-May/056291.html.
Fix is to only update the last update time stored in the node if the
new time is larger than previously stored one. If a future time is
stored in the node, we preserve this time as is.
To prevent breaking things on platforms without monotonic time available
if system time is updated backwards, a safety limit of 60 seconds is
used. If the time stored in the node is more than 60 seconds in the future,
we assume that the time was changed backwards and update lr->last
to the current time.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Wed, 30 May 2018 15:40:34 +0300 |
parents | 903fb1ddc07f |
children | bca4dad0d3cb |
rev | line source |
---|---|
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 { | |
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14 u_char color; |
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15 u_char dummy; |
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16 u_short len; |
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17 ngx_queue_t queue; |
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18 ngx_msec_t last; |
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19 /* integer value, 1 corresponds to 0.001 r/s */ |
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20 ngx_uint_t excess; |
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21 ngx_uint_t count; |
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22 u_char data[1]; |
2294 | 23 } ngx_http_limit_req_node_t; |
980 | 24 |
25 | |
26 typedef struct { | |
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27 ngx_rbtree_t rbtree; |
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28 ngx_rbtree_node_t sentinel; |
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29 ngx_queue_t queue; |
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30 } ngx_http_limit_req_shctx_t; |
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31 |
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32 |
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33 typedef struct { |
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34 ngx_http_limit_req_shctx_t *sh; |
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35 ngx_slab_pool_t *shpool; |
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36 /* integer value, 1 corresponds to 0.001 r/s */ |
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37 ngx_uint_t rate; |
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38 ngx_http_complex_value_t key; |
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39 ngx_http_limit_req_node_t *node; |
2294 | 40 } ngx_http_limit_req_ctx_t; |
987 | 41 |
42 | |
43 typedef struct { | |
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44 ngx_shm_zone_t *shm_zone; |
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45 /* integer value, 1 corresponds to 0.001 r/s */ |
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46 ngx_uint_t burst; |
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47 ngx_uint_t nodelay; /* unsigned nodelay:1 */ |
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48 } ngx_http_limit_req_limit_t; |
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49 |
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50 |
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51 typedef struct { |
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52 ngx_array_t limits; |
3185 | 53 ngx_uint_t limit_log_level; |
54 ngx_uint_t delay_log_level; | |
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55 ngx_uint_t status_code; |
2294 | 56 } ngx_http_limit_req_conf_t; |
980 | 57 |
58 | |
2294 | 59 static void ngx_http_limit_req_delay(ngx_http_request_t *r); |
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60 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_limit_t *limit, |
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61 ngx_uint_t hash, ngx_str_t *key, ngx_uint_t *ep, ngx_uint_t account); |
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62 static ngx_msec_t ngx_http_limit_req_account(ngx_http_limit_req_limit_t *limits, |
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63 ngx_uint_t n, ngx_uint_t *ep, ngx_http_limit_req_limit_t **limit); |
2294 | 64 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, |
65 ngx_uint_t n); | |
980 | 66 |
2294 | 67 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf); |
68 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, | |
980 | 69 void *child); |
2294 | 70 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, |
980 | 71 void *conf); |
2294 | 72 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, |
980 | 73 void *conf); |
2294 | 74 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf); |
980 | 75 |
76 | |
3185 | 77 static ngx_conf_enum_t ngx_http_limit_req_log_levels[] = { |
78 { ngx_string("info"), NGX_LOG_INFO }, | |
79 { ngx_string("notice"), NGX_LOG_NOTICE }, | |
80 { ngx_string("warn"), NGX_LOG_WARN }, | |
81 { ngx_string("error"), NGX_LOG_ERR }, | |
82 { ngx_null_string, 0 } | |
83 }; | |
84 | |
85 | |
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86 static ngx_conf_num_bounds_t ngx_http_limit_req_status_bounds = { |
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87 ngx_conf_check_num_bounds, 400, 599 |
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88 }; |
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89 |
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90 |
2294 | 91 static ngx_command_t ngx_http_limit_req_commands[] = { |
980 | 92 |
2294 | 93 { ngx_string("limit_req_zone"), |
987 | 94 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3, |
2294 | 95 ngx_http_limit_req_zone, |
980 | 96 0, |
97 0, | |
98 NULL }, | |
99 | |
2294 | 100 { ngx_string("limit_req"), |
101 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123, | |
102 ngx_http_limit_req, | |
980 | 103 NGX_HTTP_LOC_CONF_OFFSET, |
104 0, | |
105 NULL }, | |
106 | |
3185 | 107 { ngx_string("limit_req_log_level"), |
108 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
109 ngx_conf_set_enum_slot, | |
110 NGX_HTTP_LOC_CONF_OFFSET, | |
111 offsetof(ngx_http_limit_req_conf_t, limit_log_level), | |
112 &ngx_http_limit_req_log_levels }, | |
113 | |
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114 { ngx_string("limit_req_status"), |
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115 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, |
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116 ngx_conf_set_num_slot, |
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117 NGX_HTTP_LOC_CONF_OFFSET, |
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118 offsetof(ngx_http_limit_req_conf_t, status_code), |
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119 &ngx_http_limit_req_status_bounds }, |
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120 |
980 | 121 ngx_null_command |
122 }; | |
123 | |
124 | |
2294 | 125 static ngx_http_module_t ngx_http_limit_req_module_ctx = { |
980 | 126 NULL, /* preconfiguration */ |
2294 | 127 ngx_http_limit_req_init, /* postconfiguration */ |
980 | 128 |
129 NULL, /* create main configuration */ | |
130 NULL, /* init main configuration */ | |
131 | |
132 NULL, /* create server configuration */ | |
133 NULL, /* merge server configuration */ | |
134 | |
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135 ngx_http_limit_req_create_conf, /* create location configuration */ |
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136 ngx_http_limit_req_merge_conf /* merge location configuration */ |
980 | 137 }; |
138 | |
139 | |
2294 | 140 ngx_module_t ngx_http_limit_req_module = { |
980 | 141 NGX_MODULE_V1, |
2294 | 142 &ngx_http_limit_req_module_ctx, /* module context */ |
143 ngx_http_limit_req_commands, /* module directives */ | |
980 | 144 NGX_HTTP_MODULE, /* module type */ |
145 NULL, /* init master */ | |
146 NULL, /* init module */ | |
147 NULL, /* init process */ | |
148 NULL, /* init thread */ | |
149 NULL, /* exit thread */ | |
150 NULL, /* exit process */ | |
151 NULL, /* exit master */ | |
152 NGX_MODULE_V1_PADDING | |
153 }; | |
154 | |
155 | |
156 static ngx_int_t | |
2294 | 157 ngx_http_limit_req_handler(ngx_http_request_t *r) |
980 | 158 { |
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159 uint32_t hash; |
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160 ngx_str_t key; |
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161 ngx_int_t rc; |
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162 ngx_uint_t n, excess; |
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163 ngx_msec_t delay; |
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164 ngx_http_limit_req_ctx_t *ctx; |
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165 ngx_http_limit_req_conf_t *lrcf; |
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166 ngx_http_limit_req_limit_t *limit, *limits; |
980 | 167 |
2294 | 168 if (r->main->limit_req_set) { |
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169 return NGX_DECLINED; |
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170 } |
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171 |
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172 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module); |
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173 limits = lrcf->limits.elts; |
980 | 174 |
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175 excess = 0; |
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176 |
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177 rc = NGX_DECLINED; |
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178 |
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179 #if (NGX_SUPPRESS_WARN) |
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180 limit = NULL; |
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181 #endif |
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182 |
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183 for (n = 0; n < lrcf->limits.nelts; n++) { |
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184 |
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185 limit = &limits[n]; |
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186 |
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187 ctx = limit->shm_zone->data; |
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188 |
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189 if (ngx_http_complex_value(r, &ctx->key, &key) != NGX_OK) { |
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190 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
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191 } |
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192 |
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193 if (key.len == 0) { |
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194 continue; |
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195 } |
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196 |
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197 if (key.len > 65535) { |
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198 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, |
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199 "the value of the \"%V\" key " |
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200 "is more than 65535 bytes: \"%V\"", |
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201 &ctx->key.value, &key); |
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202 continue; |
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203 } |
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204 |
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205 hash = ngx_crc32_short(key.data, key.len); |
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206 |
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207 ngx_shmtx_lock(&ctx->shpool->mutex); |
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208 |
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209 rc = ngx_http_limit_req_lookup(limit, hash, &key, &excess, |
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210 (n == lrcf->limits.nelts - 1)); |
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211 |
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212 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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213 |
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214 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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215 "limit_req[%ui]: %i %ui.%03ui", |
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216 n, rc, excess / 1000, excess % 1000); |
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217 |
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218 if (rc != NGX_AGAIN) { |
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219 break; |
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220 } |
980 | 221 } |
222 | |
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223 if (rc == NGX_DECLINED) { |
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224 return NGX_DECLINED; |
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225 } |
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226 |
2294 | 227 r->main->limit_req_set = 1; |
980 | 228 |
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229 if (rc == NGX_BUSY || rc == NGX_ERROR) { |
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230 |
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231 if (rc == NGX_BUSY) { |
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232 ngx_log_error(lrcf->limit_log_level, r->connection->log, 0, |
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233 "limiting requests, excess: %ui.%03ui by zone \"%V\"", |
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234 excess / 1000, excess % 1000, |
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235 &limit->shm_zone->shm.name); |
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236 } |
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237 |
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238 while (n--) { |
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239 ctx = limits[n].shm_zone->data; |
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240 |
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241 if (ctx->node == NULL) { |
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242 continue; |
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243 } |
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244 |
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245 ngx_shmtx_lock(&ctx->shpool->mutex); |
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246 |
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247 ctx->node->count--; |
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248 |
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249 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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250 |
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251 ctx->node = NULL; |
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252 } |
980 | 253 |
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254 return lrcf->status_code; |
980 | 255 } |
256 | |
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257 /* rc == NGX_AGAIN || rc == NGX_OK */ |
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258 |
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259 if (rc == NGX_AGAIN) { |
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260 excess = 0; |
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261 } |
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262 |
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263 delay = ngx_http_limit_req_account(limits, n, &excess, &limit); |
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264 |
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265 if (!delay) { |
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266 return NGX_DECLINED; |
2294 | 267 } |
268 | |
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269 ngx_log_error(lrcf->delay_log_level, r->connection->log, 0, |
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270 "delaying request, excess: %ui.%03ui, by zone \"%V\"", |
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271 excess / 1000, excess % 1000, &limit->shm_zone->shm.name); |
2294 | 272 |
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273 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
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274 return NGX_HTTP_INTERNAL_SERVER_ERROR; |
2294 | 275 } |
276 | |
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277 r->read_event_handler = ngx_http_test_reading; |
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278 r->write_event_handler = ngx_http_limit_req_delay; |
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279 |
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280 r->connection->write->delayed = 1; |
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281 ngx_add_timer(r->connection->write, delay); |
2294 | 282 |
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283 return NGX_AGAIN; |
980 | 284 } |
285 | |
286 | |
287 static void | |
2294 | 288 ngx_http_limit_req_delay(ngx_http_request_t *r) |
289 { | |
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290 ngx_event_t *wev; |
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291 |
2294 | 292 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
2973 | 293 "limit_req delay"); |
2294 | 294 |
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295 wev = r->connection->write; |
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296 |
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297 if (wev->delayed) { |
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298 |
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299 if (ngx_handle_write_event(wev, 0) != NGX_OK) { |
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300 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); |
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301 } |
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302 |
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303 return; |
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304 } |
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305 |
2294 | 306 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { |
307 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); | |
308 return; | |
309 } | |
310 | |
311 r->read_event_handler = ngx_http_block_reading; | |
312 r->write_event_handler = ngx_http_core_run_phases; | |
313 | |
314 ngx_http_core_run_phases(r); | |
315 } | |
316 | |
317 | |
318 static void | |
319 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp, | |
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320 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel) |
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321 { |
2294 | 322 ngx_rbtree_node_t **p; |
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323 ngx_http_limit_req_node_t *lrn, *lrnt; |
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324 |
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325 for ( ;; ) { |
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326 |
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327 if (node->key < temp->key) { |
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328 |
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329 p = &temp->left; |
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330 |
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331 } else if (node->key > temp->key) { |
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332 |
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333 p = &temp->right; |
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334 |
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335 } else { /* node->key == temp->key */ |
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336 |
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337 lrn = (ngx_http_limit_req_node_t *) &node->color; |
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338 lrnt = (ngx_http_limit_req_node_t *) &temp->color; |
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339 |
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340 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0) |
1743
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optimize rbtree initialization and insert
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341 ? &temp->left : &temp->right; |
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|
342 } |
1026
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343 |
1743
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|
344 if (*p == sentinel) { |
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|
345 break; |
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|
346 } |
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347 |
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|
348 temp = *p; |
1026
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349 } |
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350 |
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351 *p = node; |
1026
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352 node->parent = temp; |
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|
353 node->left = sentinel; |
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|
354 node->right = sentinel; |
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|
355 ngx_rbt_red(node); |
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|
356 } |
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357 |
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|
358 |
2294 | 359 static ngx_int_t |
4420
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Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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changeset
|
360 ngx_http_limit_req_lookup(ngx_http_limit_req_limit_t *limit, ngx_uint_t hash, |
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Limit req: reduced number of parameters in the lookup function.
Valentin Bartenev <vbart@nginx.com>
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|
361 ngx_str_t *key, ngx_uint_t *ep, ngx_uint_t account) |
980 | 362 { |
4418
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
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changeset
|
363 size_t size; |
2313 | 364 ngx_int_t rc, excess; |
2294 | 365 ngx_msec_t now; |
366 ngx_msec_int_t ms; | |
367 ngx_rbtree_node_t *node, *sentinel; | |
368 ngx_http_limit_req_ctx_t *ctx; | |
2374
7b11f9a1bfe1
rename "lz" to "lr" in variable names
Igor Sysoev <igor@sysoev.ru>
parents:
2313
diff
changeset
|
369 ngx_http_limit_req_node_t *lr; |
2294 | 370 |
6653
7a6456398fc3
Simplified extraction of current time.
Ruslan Ermilov <ru@nginx.com>
parents:
6117
diff
changeset
|
371 now = ngx_current_msec; |
4418
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Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
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|
372 |
4420
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Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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changeset
|
373 ctx = limit->shm_zone->data; |
2294 | 374 |
2720
b3b8c66bd520
support attaching to an existent Win32 shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
2716
diff
changeset
|
375 node = ctx->sh->rbtree.root; |
b3b8c66bd520
support attaching to an existent Win32 shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
2716
diff
changeset
|
376 sentinel = ctx->sh->rbtree.sentinel; |
980 | 377 |
2294 | 378 while (node != sentinel) { |
379 | |
380 if (hash < node->key) { | |
381 node = node->left; | |
382 continue; | |
383 } | |
384 | |
385 if (hash > node->key) { | |
386 node = node->right; | |
387 continue; | |
388 } | |
389 | |
390 /* hash == node->key */ | |
391 | |
4497
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Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
392 lr = (ngx_http_limit_req_node_t *) &node->color; |
2294 | 393 |
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Limit req: reduced number of parameters in the lookup function.
Valentin Bartenev <vbart@nginx.com>
parents:
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changeset
|
394 rc = ngx_memn2cmp(key->data, lr->data, key->len, (size_t) lr->len); |
3191 | 395 |
4497
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Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
396 if (rc == 0) { |
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Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
397 ngx_queue_remove(&lr->queue); |
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Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
398 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
3183
b87542338ac3
make limit_req to conform to the leaky bucket algorithm
Igor Sysoev <igor@sysoev.ru>
parents:
2973
diff
changeset
|
399 |
4497
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Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
400 ms = (ngx_msec_int_t) (now - lr->last); |
980 | 401 |
7281
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
402 if (ms < -60000) { |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
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changeset
|
403 ms = 1; |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
404 |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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changeset
|
405 } else if (ms < 0) { |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
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diff
changeset
|
406 ms = 0; |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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changeset
|
407 } |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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changeset
|
408 |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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changeset
|
409 excess = lr->excess - ctx->rate * ms / 1000 + 1000; |
4420
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Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
410 |
4497
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Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
411 if (excess < 0) { |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
412 excess = 0; |
2294 | 413 } |
414 | |
4497
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Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
415 *ep = excess; |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
416 |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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changeset
|
417 if ((ngx_uint_t) excess > limit->burst) { |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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changeset
|
418 return NGX_BUSY; |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
419 } |
2294 | 420 |
4497
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Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
421 if (account) { |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
422 lr->excess = excess; |
7281
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6961
diff
changeset
|
423 |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6961
diff
changeset
|
424 if (ms) { |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
parents:
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diff
changeset
|
425 lr->last = now; |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
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6961
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changeset
|
426 } |
bd6563e81cea
Limit req: improved handling of negative times.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6961
diff
changeset
|
427 |
4497
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
428 return NGX_OK; |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
429 } |
2294 | 430 |
4497
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
431 lr->count++; |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
432 |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
433 ctx->node = lr; |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
434 |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
435 return NGX_AGAIN; |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
436 } |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
437 |
95ab6658654a
Fix of rbtree lookup on hash collisions.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4424
diff
changeset
|
438 node = (rc < 0) ? node->left : node->right; |
980 | 439 } |
440 | |
3779
57aecfdcac3d
an excess was logged as 0.000 if requests were limited without delay:
Igor Sysoev <igor@sysoev.ru>
parents:
3525
diff
changeset
|
441 *ep = 0; |
2294 | 442 |
4418
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
443 size = offsetof(ngx_rbtree_node_t, color) |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
444 + offsetof(ngx_http_limit_req_node_t, data) |
5863
102f85699420
Limit req: reduced number of parameters in the lookup function.
Valentin Bartenev <vbart@nginx.com>
parents:
5862
diff
changeset
|
445 + key->len; |
4418
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
446 |
4419
7084faa7a4b4
Limit req: number of cleanup calls reduced.
Valentin Bartenev <vbart@nginx.com>
parents:
4418
diff
changeset
|
447 ngx_http_limit_req_expire(ctx, 1); |
7084faa7a4b4
Limit req: number of cleanup calls reduced.
Valentin Bartenev <vbart@nginx.com>
parents:
4418
diff
changeset
|
448 |
4418
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
449 node = ngx_slab_alloc_locked(ctx->shpool, size); |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
450 |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
451 if (node == NULL) { |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
452 ngx_http_limit_req_expire(ctx, 0); |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
453 |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
454 node = ngx_slab_alloc_locked(ctx->shpool, size); |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
455 if (node == NULL) { |
5634
5024d29354f1
Core: slab log_nomem flag.
Maxim Dounin <mdounin@mdounin.ru>
parents:
5411
diff
changeset
|
456 ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0, |
5024d29354f1
Core: slab log_nomem flag.
Maxim Dounin <mdounin@mdounin.ru>
parents:
5411
diff
changeset
|
457 "could not allocate node%s", ctx->shpool->log_ctx); |
4418
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
458 return NGX_ERROR; |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
459 } |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
460 } |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
461 |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
462 node->key = hash; |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
463 |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
464 lr = (ngx_http_limit_req_node_t *) &node->color; |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
465 |
5863
102f85699420
Limit req: reduced number of parameters in the lookup function.
Valentin Bartenev <vbart@nginx.com>
parents:
5862
diff
changeset
|
466 lr->len = (u_short) key->len; |
4418
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
467 lr->excess = 0; |
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
468 |
5863
102f85699420
Limit req: reduced number of parameters in the lookup function.
Valentin Bartenev <vbart@nginx.com>
parents:
5862
diff
changeset
|
469 ngx_memcpy(lr->data, key->data, key->len); |
4418
aac79fc948cc
Limit req: allocation and initialization of a new node moved to the lookup
Valentin Bartenev <vbart@nginx.com>
parents:
4417
diff
changeset
|
470 |
4832
949ea3d3cd1a
Limit req: fix of rbtree node insertion on hash collisions.
Valentin Bartenev <vbart@nginx.com>
parents:
4811
diff
changeset
|
471 ngx_rbtree_insert(&ctx->sh->rbtree, node); |
949ea3d3cd1a
Limit req: fix of rbtree node insertion on hash collisions.
Valentin Bartenev <vbart@nginx.com>
parents:
4811
diff
changeset
|
472 |
949ea3d3cd1a
Limit req: fix of rbtree node insertion on hash collisions.
Valentin Bartenev <vbart@nginx.com>
parents:
4811
diff
changeset
|
473 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue); |
949ea3d3cd1a
Limit req: fix of rbtree node insertion on hash collisions.
Valentin Bartenev <vbart@nginx.com>
parents:
4811
diff
changeset
|
474 |
4420
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
475 if (account) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
476 lr->last = now; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
477 lr->count = 0; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
478 return NGX_OK; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
479 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
480 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
481 lr->last = 0; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
482 lr->count = 1; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
483 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
484 ctx->node = lr; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
485 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
486 return NGX_AGAIN; |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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487 } |
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488 |
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489 |
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490 static ngx_msec_t |
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491 ngx_http_limit_req_account(ngx_http_limit_req_limit_t *limits, ngx_uint_t n, |
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492 ngx_uint_t *ep, ngx_http_limit_req_limit_t **limit) |
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493 { |
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494 ngx_int_t excess; |
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495 ngx_msec_t now, delay, max_delay; |
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496 ngx_msec_int_t ms; |
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497 ngx_http_limit_req_ctx_t *ctx; |
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498 ngx_http_limit_req_node_t *lr; |
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499 |
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500 excess = *ep; |
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501 |
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502 if (excess == 0 || (*limit)->nodelay) { |
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503 max_delay = 0; |
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504 |
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505 } else { |
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506 ctx = (*limit)->shm_zone->data; |
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507 max_delay = excess * 1000 / ctx->rate; |
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508 } |
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509 |
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510 while (n--) { |
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511 ctx = limits[n].shm_zone->data; |
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512 lr = ctx->node; |
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513 |
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514 if (lr == NULL) { |
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515 continue; |
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516 } |
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517 |
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518 ngx_shmtx_lock(&ctx->shpool->mutex); |
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519 |
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Simplified extraction of current time.
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520 now = ngx_current_msec; |
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521 ms = (ngx_msec_int_t) (now - lr->last); |
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522 |
7281
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523 if (ms < -60000) { |
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524 ms = 1; |
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525 |
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526 } else if (ms < 0) { |
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527 ms = 0; |
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528 } |
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529 |
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530 excess = lr->excess - ctx->rate * ms / 1000 + 1000; |
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531 |
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532 if (excess < 0) { |
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533 excess = 0; |
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534 } |
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|
535 |
7281
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536 if (ms) { |
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537 lr->last = now; |
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538 } |
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539 |
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540 lr->excess = excess; |
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541 lr->count--; |
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542 |
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543 ngx_shmtx_unlock(&ctx->shpool->mutex); |
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544 |
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545 ctx->node = NULL; |
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Limit req: support for multiple "limit_req" limits.
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|
546 |
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547 if (limits[n].nodelay) { |
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Limit req: support for multiple "limit_req" limits.
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diff
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548 continue; |
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Limit req: support for multiple "limit_req" limits.
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|
549 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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|
550 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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551 delay = excess * 1000 / ctx->rate; |
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Limit req: support for multiple "limit_req" limits.
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|
552 |
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|
553 if (delay > max_delay) { |
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|
554 max_delay = delay; |
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555 *ep = excess; |
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556 *limit = &limits[n]; |
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|
557 } |
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|
558 } |
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Limit req: support for multiple "limit_req" limits.
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|
559 |
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Limit req: support for multiple "limit_req" limits.
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|
560 return max_delay; |
2294 | 561 } |
562 | |
563 | |
564 static void | |
565 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) | |
566 { | |
2313 | 567 ngx_int_t excess; |
2294 | 568 ngx_msec_t now; |
569 ngx_queue_t *q; | |
570 ngx_msec_int_t ms; | |
571 ngx_rbtree_node_t *node; | |
2374
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|
572 ngx_http_limit_req_node_t *lr; |
2294 | 573 |
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Simplified extraction of current time.
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diff
changeset
|
574 now = ngx_current_msec; |
2294 | 575 |
576 /* | |
577 * n == 1 deletes one or two zero rate entries | |
578 * n == 0 deletes oldest entry by force | |
579 * and one or two zero rate entries | |
580 */ | |
581 | |
582 while (n < 3) { | |
583 | |
2720
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support attaching to an existent Win32 shared memory
Igor Sysoev <igor@sysoev.ru>
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2716
diff
changeset
|
584 if (ngx_queue_empty(&ctx->sh->queue)) { |
2294 | 585 return; |
586 } | |
587 | |
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support attaching to an existent Win32 shared memory
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diff
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|
588 q = ngx_queue_last(&ctx->sh->queue); |
2294 | 589 |
2374
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Igor Sysoev <igor@sysoev.ru>
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diff
changeset
|
590 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); |
2294 | 591 |
4420
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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parents:
4419
diff
changeset
|
592 if (lr->count) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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4419
diff
changeset
|
593 |
9ce48f9eb85b
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diff
changeset
|
594 /* |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
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diff
changeset
|
595 * There is not much sense in looking further, |
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Limit req: support for multiple "limit_req" limits.
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diff
changeset
|
596 * because we bump nodes on the lookup stage. |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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diff
changeset
|
597 */ |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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4419
diff
changeset
|
598 |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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4419
diff
changeset
|
599 return; |
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Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
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4419
diff
changeset
|
600 } |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
601 |
2294 | 602 if (n++ != 0) { |
603 | |
2374
7b11f9a1bfe1
rename "lz" to "lr" in variable names
Igor Sysoev <igor@sysoev.ru>
parents:
2313
diff
changeset
|
604 ms = (ngx_msec_int_t) (now - lr->last); |
2294 | 605 ms = ngx_abs(ms); |
606 | |
607 if (ms < 60000) { | |
608 return; | |
609 } | |
610 | |
2374
7b11f9a1bfe1
rename "lz" to "lr" in variable names
Igor Sysoev <igor@sysoev.ru>
parents:
2313
diff
changeset
|
611 excess = lr->excess - ctx->rate * ms / 1000; |
2294 | 612 |
2313 | 613 if (excess > 0) { |
2294 | 614 return; |
615 } | |
616 } | |
617 | |
618 ngx_queue_remove(q); | |
619 | |
620 node = (ngx_rbtree_node_t *) | |
2374
7b11f9a1bfe1
rename "lz" to "lr" in variable names
Igor Sysoev <igor@sysoev.ru>
parents:
2313
diff
changeset
|
621 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color)); |
2294 | 622 |
2720
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support attaching to an existent Win32 shared memory
Igor Sysoev <igor@sysoev.ru>
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2716
diff
changeset
|
623 ngx_rbtree_delete(&ctx->sh->rbtree, node); |
2294 | 624 |
625 ngx_slab_free_locked(ctx->shpool, node); | |
626 } | |
980 | 627 } |
628 | |
629 | |
630 static ngx_int_t | |
2294 | 631 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data) |
980 | 632 { |
2294 | 633 ngx_http_limit_req_ctx_t *octx = data; |
993
1b9a4d92173f
pass the inherited shm_zone data
Igor Sysoev <igor@sysoev.ru>
parents:
987
diff
changeset
|
634 |
2611
2bce3f6416c6
improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents:
2376
diff
changeset
|
635 size_t len; |
2294 | 636 ngx_http_limit_req_ctx_t *ctx; |
980 | 637 |
993
1b9a4d92173f
pass the inherited shm_zone data
Igor Sysoev <igor@sysoev.ru>
parents:
987
diff
changeset
|
638 ctx = shm_zone->data; |
1b9a4d92173f
pass the inherited shm_zone data
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parents:
987
diff
changeset
|
639 |
1b9a4d92173f
pass the inherited shm_zone data
Igor Sysoev <igor@sysoev.ru>
parents:
987
diff
changeset
|
640 if (octx) { |
5862
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
641 if (ctx->key.value.len != octx->key.value.len |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
642 || ngx_strncmp(ctx->key.value.data, octx->key.value.data, |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
643 ctx->key.value.len) |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
644 != 0) |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
645 { |
993
1b9a4d92173f
pass the inherited shm_zone data
Igor Sysoev <igor@sysoev.ru>
parents:
987
diff
changeset
|
646 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0, |
5862
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
647 "limit_req \"%V\" uses the \"%V\" key " |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
648 "while previously it used the \"%V\" key", |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
649 &shm_zone->shm.name, &ctx->key.value, |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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650 &octx->key.value); |
993
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651 return NGX_ERROR; |
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|
652 } |
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653 |
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654 ctx->sh = octx->sh; |
2294 | 655 ctx->shpool = octx->shpool; |
993
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pass the inherited shm_zone data
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656 |
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657 return NGX_OK; |
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|
658 } |
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659 |
2294 | 660 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr; |
980 | 661 |
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662 if (shm_zone->shm.exists) { |
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663 ctx->sh = ctx->shpool->data; |
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664 |
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665 return NGX_OK; |
980 | 666 } |
667 | |
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668 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t)); |
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|
669 if (ctx->sh == NULL) { |
980 | 670 return NGX_ERROR; |
671 } | |
672 | |
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673 ctx->shpool->data = ctx->sh; |
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674 |
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|
675 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel, |
2294 | 676 ngx_http_limit_req_rbtree_insert_value); |
677 | |
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678 ngx_queue_init(&ctx->sh->queue); |
980 | 679 |
2716
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move zone name from ngx_shm_zone_t to ngx_shm_t to use Win32 shared memory
Igor Sysoev <igor@sysoev.ru>
parents:
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diff
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|
680 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len; |
2611
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improve ngx_slab_alloc() error logging
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|
681 |
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|
682 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len); |
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683 if (ctx->shpool->log_ctx == NULL) { |
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684 return NGX_ERROR; |
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685 } |
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686 |
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|
687 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z", |
2716
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|
688 &shm_zone->shm.name); |
2611
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diff
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|
689 |
5634
5024d29354f1
Core: slab log_nomem flag.
Maxim Dounin <mdounin@mdounin.ru>
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5411
diff
changeset
|
690 ctx->shpool->log_nomem = 0; |
5024d29354f1
Core: slab log_nomem flag.
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|
691 |
980 | 692 return NGX_OK; |
693 } | |
694 | |
695 | |
696 static void * | |
2294 | 697 ngx_http_limit_req_create_conf(ngx_conf_t *cf) |
980 | 698 { |
2294 | 699 ngx_http_limit_req_conf_t *conf; |
980 | 700 |
2294 | 701 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t)); |
980 | 702 if (conf == NULL) { |
2912
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return NULL instead of NGX_CONF_ERROR on a create conf failure
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|
703 return NULL; |
980 | 704 } |
705 | |
706 /* | |
707 * set by ngx_pcalloc(): | |
708 * | |
4420
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
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|
709 * conf->limits.elts = NULL; |
980 | 710 */ |
711 | |
3185 | 712 conf->limit_log_level = NGX_CONF_UNSET_UINT; |
5117
00e4459739ed
The limit_req_status and limit_conn_status directives.
Maxim Dounin <mdounin@mdounin.ru>
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4832
diff
changeset
|
713 conf->status_code = NGX_CONF_UNSET_UINT; |
3185 | 714 |
980 | 715 return conf; |
716 } | |
717 | |
718 | |
719 static char * | |
2294 | 720 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child) |
980 | 721 { |
2294 | 722 ngx_http_limit_req_conf_t *prev = parent; |
723 ngx_http_limit_req_conf_t *conf = child; | |
980 | 724 |
4420
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Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
4419
diff
changeset
|
725 if (conf->limits.elts == NULL) { |
9ce48f9eb85b
Limit req: support for multiple "limit_req" limits.
Valentin Bartenev <vbart@nginx.com>
parents:
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diff
changeset
|
726 conf->limits = prev->limits; |
980 | 727 } |
728 | |
3185 | 729 ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level, |
730 NGX_LOG_ERR); | |
731 | |
732 conf->delay_log_level = (conf->limit_log_level == NGX_LOG_INFO) ? | |
733 NGX_LOG_INFO : conf->limit_log_level + 1; | |
734 | |
5117
00e4459739ed
The limit_req_status and limit_conn_status directives.
Maxim Dounin <mdounin@mdounin.ru>
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4832
diff
changeset
|
735 ngx_conf_merge_uint_value(conf->status_code, prev->status_code, |
00e4459739ed
The limit_req_status and limit_conn_status directives.
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parents:
4832
diff
changeset
|
736 NGX_HTTP_SERVICE_UNAVAILABLE); |
00e4459739ed
The limit_req_status and limit_conn_status directives.
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parents:
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diff
changeset
|
737 |
980 | 738 return NGX_CONF_OK; |
739 } | |
740 | |
741 | |
742 static char * | |
2294 | 743 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
980 | 744 { |
5862
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parents:
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diff
changeset
|
745 u_char *p; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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diff
changeset
|
746 size_t len; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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diff
changeset
|
747 ssize_t size; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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diff
changeset
|
748 ngx_str_t *value, name, s; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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parents:
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diff
changeset
|
749 ngx_int_t rate, scale; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
750 ngx_uint_t i; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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parents:
5846
diff
changeset
|
751 ngx_shm_zone_t *shm_zone; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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parents:
5846
diff
changeset
|
752 ngx_http_limit_req_ctx_t *ctx; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
753 ngx_http_compile_complex_value_t ccv; |
980 | 754 |
755 value = cf->args->elts; | |
756 | |
5862
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Limit req: use complex value in limit_req_zone.
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diff
changeset
|
757 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t)); |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
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5846
diff
changeset
|
758 if (ctx == NULL) { |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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parents:
5846
diff
changeset
|
759 return NGX_CONF_ERROR; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
760 } |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
761 |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
762 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t)); |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
763 |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
764 ccv.cf = cf; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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parents:
5846
diff
changeset
|
765 ccv.value = &value[1]; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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parents:
5846
diff
changeset
|
766 ccv.complex_value = &ctx->key; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
767 |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
768 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) { |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
769 return NGX_CONF_ERROR; |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
770 } |
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
Valentin Bartenev <vbart@nginx.com>
parents:
5846
diff
changeset
|
771 |
2294 | 772 size = 0; |
773 rate = 1; | |
774 scale = 1; | |
775 name.len = 0; | |
776 | |
5862
ecbb99aa0e12
Limit req: use complex value in limit_req_zone.
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parents:
5846
diff
changeset
|
777 for (i = 2; i < cf->args->nelts; i++) { |
2294 | 778 |
779 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
780 | |
781 name.data = value[i].data + 5; | |
782 | |
783 p = (u_char *) ngx_strchr(name.data, ':'); | |
784 | |
4417
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
785 if (p == NULL) { |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
786 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
787 "invalid zone size \"%V\"", &value[i]); |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
788 return NGX_CONF_ERROR; |
2294 | 789 } |
790 | |
4417
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
791 name.len = p - name.data; |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
792 |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
793 s.data = p + 1; |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
794 s.len = value[i].data + value[i].len - s.data; |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
795 |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
796 size = ngx_parse_size(&s); |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
797 |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
798 if (size == NGX_ERROR) { |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
799 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
800 "invalid zone size \"%V\"", &value[i]); |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
801 return NGX_CONF_ERROR; |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
802 } |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
803 |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
804 if (size < (ssize_t) (8 * ngx_pagesize)) { |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
805 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
806 "zone \"%V\" is too small", &value[i]); |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
807 return NGX_CONF_ERROR; |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
808 } |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
809 |
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
810 continue; |
2294 | 811 } |
812 | |
813 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) { | |
814 | |
815 len = value[i].len; | |
816 p = value[i].data + len - 3; | |
987 | 817 |
2294 | 818 if (ngx_strncmp(p, "r/s", 3) == 0) { |
819 scale = 1; | |
820 len -= 3; | |
821 | |
822 } else if (ngx_strncmp(p, "r/m", 3) == 0) { | |
823 scale = 60; | |
824 len -= 3; | |
825 } | |
826 | |
827 rate = ngx_atoi(value[i].data + 5, len - 5); | |
5166
fc595eeb6c54
Limit req: rate should be non-zero.
Valentin Bartenev <vbart@nginx.com>
parents:
5117
diff
changeset
|
828 if (rate <= 0) { |
2294 | 829 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
830 "invalid rate \"%V\"", &value[i]); | |
831 return NGX_CONF_ERROR; | |
832 } | |
833 | |
834 continue; | |
835 } | |
836 | |
837 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
838 "invalid parameter \"%V\"", &value[i]); | |
987 | 839 return NGX_CONF_ERROR; |
840 } | |
841 | |
4417
9e9d2e06f933
Limit req: improved error handling when parsing "zone" parameter of
Valentin Bartenev <vbart@nginx.com>
parents:
4416
diff
changeset
|
842 if (name.len == 0) { |
2294 | 843 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
844 "\"%V\" must have \"zone\" parameter", | |
845 &cmd->name); | |
987 | 846 return NGX_CONF_ERROR; |
847 } | |
848 | |
2313 | 849 ctx->rate = rate * 1000 / scale; |
980 | 850 |
2294 | 851 shm_zone = ngx_shared_memory_add(cf, &name, size, |
852 &ngx_http_limit_req_module); | |
980 | 853 if (shm_zone == NULL) { |
854 return NGX_CONF_ERROR; | |
855 } | |
856 | |
987 | 857 if (shm_zone->data) { |
858 ctx = shm_zone->data; | |
859 | |
860 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
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861 "%V \"%V\" is already bound to key \"%V\"", |
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862 &cmd->name, &name, &ctx->key.value); |
987 | 863 return NGX_CONF_ERROR; |
864 } | |
865 | |
2294 | 866 shm_zone->init = ngx_http_limit_req_init_zone; |
987 | 867 shm_zone->data = ctx; |
980 | 868 |
869 return NGX_CONF_OK; | |
870 } | |
871 | |
872 | |
873 static char * | |
2294 | 874 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
980 | 875 { |
2374
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876 ngx_http_limit_req_conf_t *lrcf = conf; |
980 | 877 |
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878 ngx_int_t burst; |
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879 ngx_str_t *value, s; |
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880 ngx_uint_t i, nodelay; |
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881 ngx_shm_zone_t *shm_zone; |
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882 ngx_http_limit_req_limit_t *limit, *limits; |
980 | 883 |
884 value = cf->args->elts; | |
885 | |
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886 shm_zone = NULL; |
2294 | 887 burst = 0; |
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888 nodelay = 0; |
2294 | 889 |
890 for (i = 1; i < cf->args->nelts; i++) { | |
891 | |
892 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) { | |
893 | |
894 s.len = value[i].len - 5; | |
895 s.data = value[i].data + 5; | |
896 | |
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897 shm_zone = ngx_shared_memory_add(cf, &s, 0, |
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898 &ngx_http_limit_req_module); |
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899 if (shm_zone == NULL) { |
2294 | 900 return NGX_CONF_ERROR; |
901 } | |
902 | |
903 continue; | |
904 } | |
905 | |
906 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) { | |
907 | |
2300
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908 burst = ngx_atoi(value[i].data + 6, value[i].len - 6); |
2294 | 909 if (burst <= 0) { |
910 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
911 "invalid burst rate \"%V\"", &value[i]); | |
912 return NGX_CONF_ERROR; | |
913 } | |
914 | |
915 continue; | |
916 } | |
917 | |
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918 if (ngx_strcmp(value[i].data, "nodelay") == 0) { |
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919 nodelay = 1; |
2294 | 920 continue; |
921 } | |
922 | |
923 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
924 "invalid parameter \"%V\"", &value[i]); | |
980 | 925 return NGX_CONF_ERROR; |
926 } | |
927 | |
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928 if (shm_zone == NULL) { |
980 | 929 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
2294 | 930 "\"%V\" must have \"zone\" parameter", |
931 &cmd->name); | |
980 | 932 return NGX_CONF_ERROR; |
933 } | |
934 | |
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935 limits = lrcf->limits.elts; |
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936 |
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937 if (limits == NULL) { |
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938 if (ngx_array_init(&lrcf->limits, cf->pool, 1, |
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939 sizeof(ngx_http_limit_req_limit_t)) |
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940 != NGX_OK) |
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941 { |
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942 return NGX_CONF_ERROR; |
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943 } |
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944 } |
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945 |
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946 for (i = 0; i < lrcf->limits.nelts; i++) { |
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947 if (shm_zone == limits[i].shm_zone) { |
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948 return "is duplicate"; |
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949 } |
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950 } |
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951 |
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952 limit = ngx_array_push(&lrcf->limits); |
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953 if (limit == NULL) { |
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954 return NGX_CONF_ERROR; |
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955 } |
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956 |
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957 limit->shm_zone = shm_zone; |
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958 limit->burst = burst * 1000; |
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959 limit->nodelay = nodelay; |
980 | 960 |
961 return NGX_CONF_OK; | |
962 } | |
963 | |
964 | |
965 static ngx_int_t | |
2294 | 966 ngx_http_limit_req_init(ngx_conf_t *cf) |
980 | 967 { |
968 ngx_http_handler_pt *h; | |
969 ngx_http_core_main_conf_t *cmcf; | |
970 | |
971 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); | |
972 | |
973 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); | |
974 if (h == NULL) { | |
975 return NGX_ERROR; | |
976 } | |
977 | |
2294 | 978 *h = ngx_http_limit_req_handler; |
980 | 979 |
980 return NGX_OK; | |
981 } |