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416
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_http.h>
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10
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11
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12 typedef struct {
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13 u_char color;
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14 u_char dummy;
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15 u_short len;
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16 ngx_queue_t queue;
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17 ngx_msec_t last;
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18 float rate;
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19 u_char data[1];
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20 } ngx_http_limit_req_node_t;
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21
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22
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23 typedef struct {
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24 ngx_rbtree_t *rbtree;
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25 ngx_queue_t *queue;
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26 ngx_slab_pool_t *shpool;
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27 float rate;
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28 ngx_int_t index;
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29 ngx_str_t var;
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30 } ngx_http_limit_req_ctx_t;
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31
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32
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33 typedef struct {
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34 ngx_shm_zone_t *shm_zone;
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35 float burst;
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36 ngx_msec_t delay;
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37 } ngx_http_limit_req_conf_t;
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38
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39
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40 static void ngx_http_limit_req_delay(ngx_http_request_t *r);
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41 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lzcf,
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42 ngx_uint_t hash, u_char *data, size_t len, ngx_http_limit_req_node_t **lzp);
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43 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx,
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44 ngx_uint_t n);
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45
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46 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf);
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47 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent,
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48 void *child);
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49 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd,
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50 void *conf);
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51 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd,
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52 void *conf);
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53 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf);
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54
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55
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56 static ngx_command_t ngx_http_limit_req_commands[] = {
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57
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58 { ngx_string("limit_req_zone"),
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59 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3,
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60 ngx_http_limit_req_zone,
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61 0,
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62 0,
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63 NULL },
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64
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65 { ngx_string("limit_req"),
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66 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123,
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67 ngx_http_limit_req,
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68 NGX_HTTP_LOC_CONF_OFFSET,
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69 0,
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70 NULL },
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71
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72 ngx_null_command
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73 };
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74
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75
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76 static ngx_http_module_t ngx_http_limit_req_module_ctx = {
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77 NULL, /* preconfiguration */
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78 ngx_http_limit_req_init, /* postconfiguration */
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79
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80 NULL, /* create main configuration */
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81 NULL, /* init main configuration */
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82
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83 NULL, /* create server configuration */
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84 NULL, /* merge server configuration */
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85
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86 ngx_http_limit_req_create_conf, /* create location configration */
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87 ngx_http_limit_req_merge_conf /* merge location configration */
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88 };
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89
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90
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91 ngx_module_t ngx_http_limit_req_module = {
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92 NGX_MODULE_V1,
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93 &ngx_http_limit_req_module_ctx, /* module context */
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94 ngx_http_limit_req_commands, /* module directives */
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95 NGX_HTTP_MODULE, /* module type */
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96 NULL, /* init master */
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97 NULL, /* init module */
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98 NULL, /* init process */
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99 NULL, /* init thread */
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100 NULL, /* exit thread */
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101 NULL, /* exit process */
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102 NULL, /* exit master */
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103 NGX_MODULE_V1_PADDING
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104 };
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105
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106
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107 static ngx_int_t
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108 ngx_http_limit_req_handler(ngx_http_request_t *r)
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109 {
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110 float rate;
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111 size_t len, n;
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112 uint32_t hash;
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113 ngx_int_t rc;
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114 ngx_time_t *tp;
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115 ngx_rbtree_node_t *node;
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116 ngx_http_variable_value_t *vv;
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117 ngx_http_limit_req_ctx_t *ctx;
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118 ngx_http_limit_req_node_t *lz;
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119 ngx_http_limit_req_conf_t *lzcf;
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120
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121 if (r->main->limit_req_set) {
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122 return NGX_DECLINED;
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123 }
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124
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125 lzcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module);
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126
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127 if (lzcf->shm_zone == NULL) {
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128 return NGX_DECLINED;
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129 }
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130
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131 ctx = lzcf->shm_zone->data;
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132
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133 vv = ngx_http_get_indexed_variable(r, ctx->index);
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134
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135 if (vv == NULL || vv->not_found) {
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136 return NGX_DECLINED;
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137 }
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138
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139 len = vv->len;
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140
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141 if (len == 0) {
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142 return NGX_DECLINED;
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143 }
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144
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145 if (len > 65535) {
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146 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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147 "the value of the \"%V\" variable "
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148 "is more than 65535 bytes: \"%v\"",
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149 &ctx->var, vv);
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150 return NGX_DECLINED;
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151 }
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152
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153 r->main->limit_req_set = 1;
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154
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155 hash = ngx_crc32_short(vv->data, len);
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156
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157 ngx_shmtx_lock(&ctx->shpool->mutex);
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158
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159 ngx_http_limit_req_expire(ctx, 1);
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160
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161 rc = ngx_http_limit_req_lookup(lzcf, hash, vv->data, len, &lz);
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162
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163 if (lz) {
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164 ngx_queue_remove(&lz->queue);
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165
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166 ngx_queue_insert_head(ctx->queue, &lz->queue);
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167
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168 rate = lz->rate;
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169
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170 } else {
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171 rate = 0.0;
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172 }
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173
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174 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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175 "limit_req: %i %.3f", rc, rate);
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176
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177 if (rc == NGX_BUSY) {
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178 ngx_shmtx_unlock(&ctx->shpool->mutex);
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179
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180 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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181 "limiting requests, %.3f r/s", rate);
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182
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183 return NGX_HTTP_SERVICE_UNAVAILABLE;
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184 }
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185
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186 if (rc == NGX_AGAIN) {
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187 ngx_shmtx_unlock(&ctx->shpool->mutex);
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188
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189 if (lzcf->delay) {
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190 ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,
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191 "delaying requests, %.3f r/s", rate);
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192
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193 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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194 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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195 }
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196
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197 r->read_event_handler = ngx_http_test_reading;
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198 r->write_event_handler = ngx_http_limit_req_delay;
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199 ngx_add_timer(r->connection->write, lzcf->delay);
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200
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201 return NGX_AGAIN;
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202 }
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203
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204 return NGX_DECLINED;
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205 }
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206
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207 if (rc == NGX_OK) {
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208 goto done;
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209 }
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210
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211 /* rc == NGX_DECLINED */
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212
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213 n = offsetof(ngx_rbtree_node_t, color)
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214 + offsetof(ngx_http_limit_req_node_t, data)
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215 + len;
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216
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217 node = ngx_slab_alloc_locked(ctx->shpool, n);
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218 if (node == NULL) {
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219
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220 ngx_http_limit_req_expire(ctx, 0);
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221
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222 node = ngx_slab_alloc_locked(ctx->shpool, n);
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223 if (node == NULL) {
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224 ngx_shmtx_unlock(&ctx->shpool->mutex);
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225 return NGX_HTTP_SERVICE_UNAVAILABLE;
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226 }
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227 }
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228
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229 lz = (ngx_http_limit_req_node_t *) &node->color;
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230
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231 node->key = hash;
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232 lz->len = (u_char) len;
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233
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234 tp = ngx_timeofday();
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235 lz->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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236
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237 lz->rate = 0.0;
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238 ngx_memcpy(lz->data, vv->data, len);
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239
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240 ngx_rbtree_insert(ctx->rbtree, node);
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241
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242 ngx_queue_insert_head(ctx->queue, &lz->queue);
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243
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244 done:
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245
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246 ngx_shmtx_unlock(&ctx->shpool->mutex);
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247
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248 return NGX_DECLINED;
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249 }
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250
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251
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252 static void
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253 ngx_http_limit_req_delay(ngx_http_request_t *r)
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254 {
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255 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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256 "limit_req delay");
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257
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258 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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259 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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260 return;
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261 }
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262
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263 r->read_event_handler = ngx_http_block_reading;
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264 r->write_event_handler = ngx_http_core_run_phases;
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265
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266 ngx_http_core_run_phases(r);
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267 }
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268
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269
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270 static void
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271 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp,
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272 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
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273 {
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274 ngx_rbtree_node_t **p;
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275 ngx_http_limit_req_node_t *lzn, *lznt;
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276
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277 for ( ;; ) {
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278
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279 if (node->key < temp->key) {
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280
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281 p = &temp->left;
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282
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283 } else if (node->key > temp->key) {
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284
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285 p = &temp->right;
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286
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287 } else { /* node->key == temp->key */
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288
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289 lzn = (ngx_http_limit_req_node_t *) &node->color;
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290 lznt = (ngx_http_limit_req_node_t *) &temp->color;
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291
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292 p = (ngx_memn2cmp(lzn->data, lznt->data, lzn->len, lznt->len) < 0)
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293 ? &temp->left : &temp->right;
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294 }
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295
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296 if (*p == sentinel) {
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297 break;
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298 }
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299
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300 temp = *p;
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301 }
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302
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303 *p = node;
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304 node->parent = temp;
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305 node->left = sentinel;
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306 node->right = sentinel;
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307 ngx_rbt_red(node);
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308 }
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309
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310
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311 static ngx_int_t
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312 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lzcf, ngx_uint_t hash,
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313 u_char *data, size_t len, ngx_http_limit_req_node_t **lzp)
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314 {
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315 ngx_int_t rc;
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316 ngx_time_t *tp;
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317 ngx_msec_t now;
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318 ngx_msec_int_t ms;
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319 ngx_rbtree_node_t *node, *sentinel;
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320 ngx_http_limit_req_ctx_t *ctx;
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321 ngx_http_limit_req_node_t *lz;
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322
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323 ctx = lzcf->shm_zone->data;
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324
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325 node = ctx->rbtree->root;
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326 sentinel = ctx->rbtree->sentinel;
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327
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328 while (node != sentinel) {
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329
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330 if (hash < node->key) {
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331 node = node->left;
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332 continue;
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333 }
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334
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335 if (hash > node->key) {
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336 node = node->right;
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337 continue;
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338 }
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339
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340 /* hash == node->key */
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341
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342 do {
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343 lz = (ngx_http_limit_req_node_t *) &node->color;
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344
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345 rc = ngx_memn2cmp(data, lz->data, len, (size_t) lz->len);
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346
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347 if (rc == 0) {
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348
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349 tp = ngx_timeofday();
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350
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351 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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352 ms = (ngx_msec_int_t) (now - lz->last);
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353
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354 lz->rate = lz->rate - ctx->rate * ngx_abs(ms) / 1000 + 1;
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355
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356 if (lz->rate < 0.0) {
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357 lz->rate = 0.0;
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358 }
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359
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360 lz->last = now;
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361
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362 *lzp = lz;
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363
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364 if (lz->rate > lzcf->burst) {
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365 return NGX_BUSY;
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366 }
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367
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368 if (lz->rate > ctx->rate) {
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369 return NGX_AGAIN;
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370 }
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371
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372 return NGX_OK;
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373 }
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374
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375 node = (rc < 0) ? node->left : node->right;
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376
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377 } while (node != sentinel && hash == node->key);
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378
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379 break;
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380 }
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381
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382 *lzp = NULL;
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383
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384 return NGX_DECLINED;
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385 }
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386
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387
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388 static void
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389 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n)
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390 {
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391 float rate;
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392 ngx_time_t *tp;
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393 ngx_msec_t now;
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394 ngx_queue_t *q;
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395 ngx_msec_int_t ms;
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396 ngx_rbtree_node_t *node;
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397 ngx_http_limit_req_node_t *lz;
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398
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399 tp = ngx_timeofday();
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400
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401 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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402
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403 /*
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404 * n == 1 deletes one or two zero rate entries
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405 * n == 0 deletes oldest entry by force
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406 * and one or two zero rate entries
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407 */
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408
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409 while (n < 3) {
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410
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411 if (ngx_queue_empty(ctx->queue)) {
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412 return;
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413 }
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414
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415 q = ngx_queue_last(ctx->queue);
|
|
|
416
|
|
|
417 lz = ngx_queue_data(q, ngx_http_limit_req_node_t, queue);
|
|
|
418
|
|
|
419 if (n++ != 0) {
|
|
|
420
|
|
|
421 ms = (ngx_msec_int_t) (now - lz->last);
|
|
|
422 ms = ngx_abs(ms);
|
|
|
423
|
|
|
424 if (ms < 60000) {
|
|
|
425 return;
|
|
|
426 }
|
|
|
427
|
|
|
428 rate = lz->rate - ctx->rate * ms / 1000;
|
|
|
429
|
|
|
430 if (rate > 0.0) {
|
|
|
431 return;
|
|
|
432 }
|
|
|
433 }
|
|
|
434
|
|
|
435 ngx_queue_remove(q);
|
|
|
436
|
|
|
437 node = (ngx_rbtree_node_t *)
|
|
|
438 ((u_char *) lz - offsetof(ngx_rbtree_node_t, color));
|
|
|
439
|
|
|
440 ngx_rbtree_delete(ctx->rbtree, node);
|
|
|
441
|
|
|
442 ngx_slab_free_locked(ctx->shpool, node);
|
|
|
443 }
|
|
|
444 }
|
|
|
445
|
|
|
446
|
|
|
447 static ngx_int_t
|
|
|
448 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data)
|
|
|
449 {
|
|
|
450 ngx_http_limit_req_ctx_t *octx = data;
|
|
|
451
|
|
|
452 ngx_rbtree_node_t *sentinel;
|
|
|
453 ngx_http_limit_req_ctx_t *ctx;
|
|
|
454
|
|
|
455 ctx = shm_zone->data;
|
|
|
456
|
|
|
457 if (octx) {
|
|
|
458 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) {
|
|
|
459 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
|
|
|
460 "limit_req \"%V\" uses the \"%V\" variable "
|
|
|
461 "while previously it used the \"%V\" variable",
|
|
|
462 &shm_zone->name, &ctx->var, &octx->var);
|
|
|
463 return NGX_ERROR;
|
|
|
464 }
|
|
|
465
|
|
|
466 ctx->rbtree = octx->rbtree;
|
|
|
467 ctx->queue = octx->queue;
|
|
|
468 ctx->shpool = octx->shpool;
|
|
|
469
|
|
|
470 return NGX_OK;
|
|
|
471 }
|
|
|
472
|
|
|
473 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
|
|
|
474
|
|
|
475 ctx->rbtree = ngx_slab_alloc(ctx->shpool, sizeof(ngx_rbtree_t));
|
|
|
476 if (ctx->rbtree == NULL) {
|
|
|
477 return NGX_ERROR;
|
|
|
478 }
|
|
|
479
|
|
|
480 sentinel = ngx_slab_alloc(ctx->shpool, sizeof(ngx_rbtree_node_t));
|
|
|
481 if (sentinel == NULL) {
|
|
|
482 return NGX_ERROR;
|
|
|
483 }
|
|
|
484
|
|
|
485 ngx_rbtree_init(ctx->rbtree, sentinel,
|
|
|
486 ngx_http_limit_req_rbtree_insert_value);
|
|
|
487
|
|
|
488 ctx->queue = ngx_slab_alloc(ctx->shpool, sizeof(ngx_queue_t));
|
|
|
489 if (ctx->queue == NULL) {
|
|
|
490 return NGX_ERROR;
|
|
|
491 }
|
|
|
492
|
|
|
493 ngx_queue_init(ctx->queue);
|
|
|
494
|
|
|
495 return NGX_OK;
|
|
|
496 }
|
|
|
497
|
|
|
498
|
|
|
499 static void *
|
|
|
500 ngx_http_limit_req_create_conf(ngx_conf_t *cf)
|
|
|
501 {
|
|
|
502 ngx_http_limit_req_conf_t *conf;
|
|
|
503
|
|
|
504 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t));
|
|
|
505 if (conf == NULL) {
|
|
|
506 return NGX_CONF_ERROR;
|
|
|
507 }
|
|
|
508
|
|
|
509 /*
|
|
|
510 * set by ngx_pcalloc():
|
|
|
511 *
|
|
|
512 * conf->shm_zone = NULL;
|
|
|
513 * conf->burst = 0.0;
|
|
|
514 * conf->delay = 0;
|
|
|
515 */
|
|
|
516
|
|
|
517 return conf;
|
|
|
518 }
|
|
|
519
|
|
|
520
|
|
|
521 static char *
|
|
|
522 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
523 {
|
|
|
524 ngx_http_limit_req_conf_t *prev = parent;
|
|
|
525 ngx_http_limit_req_conf_t *conf = child;
|
|
|
526
|
|
|
527 if (conf->shm_zone == NULL) {
|
|
|
528 *conf = *prev;
|
|
|
529 }
|
|
|
530
|
|
|
531 return NGX_CONF_OK;
|
|
|
532 }
|
|
|
533
|
|
|
534
|
|
|
535 static char *
|
|
|
536 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
537 {
|
|
|
538 u_char *p;
|
|
|
539 size_t size, len;
|
|
|
540 ngx_str_t *value, name, s;
|
|
|
541 ngx_int_t rate, scale;
|
|
|
542 ngx_uint_t i;
|
|
|
543 ngx_shm_zone_t *shm_zone;
|
|
|
544 ngx_http_limit_req_ctx_t *ctx;
|
|
|
545
|
|
|
546 value = cf->args->elts;
|
|
|
547
|
|
|
548 ctx = NULL;
|
|
|
549 size = 0;
|
|
|
550 rate = 1;
|
|
|
551 scale = 1;
|
|
|
552 name.len = 0;
|
|
|
553
|
|
|
554 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
555
|
|
|
556 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
557
|
|
|
558 name.data = value[i].data + 5;
|
|
|
559
|
|
|
560 p = (u_char *) ngx_strchr(name.data, ':');
|
|
|
561
|
|
|
562 if (p) {
|
|
|
563 name.len = p - name.data;
|
|
|
564
|
|
|
565 p++;
|
|
|
566
|
|
|
567 s.len = value[i].data + value[i].len - p;
|
|
|
568 s.data = p;
|
|
|
569
|
|
|
570 size = ngx_parse_size(&s);
|
|
|
571 if (size > 8191) {
|
|
|
572 continue;
|
|
|
573 }
|
|
|
574 }
|
|
|
575
|
|
|
576 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
577 "invalid zone size \"%V\"", &value[i]);
|
|
|
578 return NGX_CONF_ERROR;
|
|
|
579 }
|
|
|
580
|
|
|
581 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) {
|
|
|
582
|
|
|
583 len = value[i].len;
|
|
|
584 p = value[i].data + len - 3;
|
|
|
585
|
|
|
586 if (ngx_strncmp(p, "r/s", 3) == 0) {
|
|
|
587 scale = 1;
|
|
|
588 len -= 3;
|
|
|
589
|
|
|
590 } else if (ngx_strncmp(p, "r/m", 3) == 0) {
|
|
|
591 scale = 60;
|
|
|
592 len -= 3;
|
|
|
593 }
|
|
|
594
|
|
|
595 rate = ngx_atoi(value[i].data + 5, len - 5);
|
|
|
596 if (rate <= NGX_ERROR) {
|
|
|
597 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
598 "invalid rate \"%V\"", &value[i]);
|
|
|
599 return NGX_CONF_ERROR;
|
|
|
600 }
|
|
|
601
|
|
|
602 continue;
|
|
|
603 }
|
|
|
604
|
|
|
605 if (value[i].data[0] == '$') {
|
|
|
606
|
|
|
607 value[i].len--;
|
|
|
608 value[i].data++;
|
|
|
609
|
|
|
610 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t));
|
|
|
611 if (ctx == NULL) {
|
|
|
612 return NGX_CONF_ERROR;
|
|
|
613 }
|
|
|
614
|
|
|
615 ctx->index = ngx_http_get_variable_index(cf, &value[i]);
|
|
|
616 if (ctx->index == NGX_ERROR) {
|
|
|
617 return NGX_CONF_ERROR;
|
|
|
618 }
|
|
|
619
|
|
|
620 ctx->var = value[i];
|
|
|
621
|
|
|
622 continue;
|
|
|
623 }
|
|
|
624
|
|
|
625 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
626 "invalid parameter \"%V\"", &value[i]);
|
|
|
627 return NGX_CONF_ERROR;
|
|
|
628 }
|
|
|
629
|
|
|
630 if (name.len == 0 || size == 0) {
|
|
|
631 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
632 "\"%V\" must have \"zone\" parameter",
|
|
|
633 &cmd->name);
|
|
|
634 return NGX_CONF_ERROR;
|
|
|
635 }
|
|
|
636
|
|
|
637 if (ctx == NULL) {
|
|
|
638 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
639 "no variable is defined for limit_req_zone \"%V\"",
|
|
|
640 &cmd->name);
|
|
|
641 return NGX_CONF_ERROR;
|
|
|
642 }
|
|
|
643
|
|
|
644 ctx->rate = (float) rate / scale;
|
|
|
645
|
|
|
646 shm_zone = ngx_shared_memory_add(cf, &name, size,
|
|
|
647 &ngx_http_limit_req_module);
|
|
|
648 if (shm_zone == NULL) {
|
|
|
649 return NGX_CONF_ERROR;
|
|
|
650 }
|
|
|
651
|
|
|
652 if (shm_zone->data) {
|
|
|
653 ctx = shm_zone->data;
|
|
|
654
|
|
|
655 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
656 "limit_req_zone \"%V\" is already bound to variable \"%V\"",
|
|
|
657 &value[1], &ctx->var);
|
|
|
658 return NGX_CONF_ERROR;
|
|
|
659 }
|
|
|
660
|
|
|
661 shm_zone->init = ngx_http_limit_req_init_zone;
|
|
|
662 shm_zone->data = ctx;
|
|
|
663
|
|
|
664 return NGX_CONF_OK;
|
|
|
665 }
|
|
|
666
|
|
|
667
|
|
|
668 static char *
|
|
|
669 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
670 {
|
|
|
671 ngx_http_limit_req_conf_t *lzcf = conf;
|
|
|
672
|
|
|
673 u_char *p;
|
|
|
674 size_t len;
|
|
|
675 ngx_int_t burst, scale, delay;
|
|
|
676 ngx_str_t *value, s;
|
|
|
677 ngx_uint_t i;
|
|
|
678 ngx_http_limit_req_ctx_t *ctx;
|
|
|
679
|
|
|
680 if (lzcf->shm_zone) {
|
|
|
681 return "is duplicate";
|
|
|
682 }
|
|
|
683
|
|
|
684 value = cf->args->elts;
|
|
|
685
|
|
|
686 burst = 0;
|
|
|
687 scale = 1;
|
|
|
688 delay = 0;
|
|
|
689
|
|
|
690 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
691
|
|
|
692 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
693
|
|
|
694 s.len = value[i].len - 5;
|
|
|
695 s.data = value[i].data + 5;
|
|
|
696
|
|
|
697 lzcf->shm_zone = ngx_shared_memory_add(cf, &s, 0,
|
|
|
698 &ngx_http_limit_req_module);
|
|
|
699 if (lzcf->shm_zone == NULL) {
|
|
|
700 return NGX_CONF_ERROR;
|
|
|
701 }
|
|
|
702
|
|
|
703 continue;
|
|
|
704 }
|
|
|
705
|
|
|
706 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) {
|
|
|
707
|
|
|
708 len = value[i].len;
|
|
|
709 p = value[i].data + len - 3;
|
|
|
710
|
|
|
711 if (ngx_strncmp(p, "r/s", 3) == 0) {
|
|
|
712 scale = 1;
|
|
|
713 len -= 3;
|
|
|
714
|
|
|
715 } else if (ngx_strncmp(p, "r/m", 3) == 0) {
|
|
|
716 scale = 60;
|
|
|
717 len -= 3;
|
|
|
718 }
|
|
|
719
|
|
|
720 burst = ngx_atoi(value[i].data + 6, len - 6);
|
|
|
721 if (burst <= 0) {
|
|
|
722 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
723 "invalid burst rate \"%V\"", &value[i]);
|
|
|
724 return NGX_CONF_ERROR;
|
|
|
725 }
|
|
|
726
|
|
|
727 continue;
|
|
|
728 }
|
|
|
729
|
|
|
730 if (ngx_strncmp(value[i].data, "delay=", 6) == 0) {
|
|
|
731
|
|
|
732 s.len = value[i].len - 6;
|
|
|
733 s.data = value[i].data + 6;
|
|
|
734
|
|
|
735 delay = ngx_parse_time(&s, 0);
|
|
|
736 if (delay < 0) {
|
|
|
737 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
738 "invalid clean_time value \"%V\"", &value[i]);
|
|
|
739 return NGX_CONF_ERROR;
|
|
|
740 }
|
|
|
741
|
|
|
742 continue;
|
|
|
743 }
|
|
|
744
|
|
|
745 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
746 "invalid parameter \"%V\"", &value[i]);
|
|
|
747 return NGX_CONF_ERROR;
|
|
|
748 }
|
|
|
749
|
|
|
750 if (lzcf->shm_zone == NULL) {
|
|
|
751 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
752 "\"%V\" must have \"zone\" parameter",
|
|
|
753 &cmd->name);
|
|
|
754 return NGX_CONF_ERROR;
|
|
|
755 }
|
|
|
756
|
|
|
757 if (lzcf->shm_zone->data == NULL) {
|
|
|
758 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
759 "unknown limit_req_zone \"%V\"",
|
|
|
760 &lzcf->shm_zone->name);
|
|
|
761 return NGX_CONF_ERROR;
|
|
|
762 }
|
|
|
763
|
|
|
764 if (burst) {
|
|
|
765 lzcf->burst = (float) burst / scale;
|
|
|
766
|
|
|
767 } else {
|
|
|
768 ctx = lzcf->shm_zone->data;
|
|
|
769 lzcf->burst = ctx->rate;
|
|
|
770 }
|
|
|
771
|
|
|
772 lzcf->delay = (ngx_msec_t) delay;
|
|
|
773
|
|
|
774 return NGX_CONF_OK;
|
|
|
775 }
|
|
|
776
|
|
|
777
|
|
|
778 static ngx_int_t
|
|
|
779 ngx_http_limit_req_init(ngx_conf_t *cf)
|
|
|
780 {
|
|
|
781 ngx_http_handler_pt *h;
|
|
|
782 ngx_http_core_main_conf_t *cmcf;
|
|
|
783
|
|
|
784 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
|
785
|
|
|
786 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
|
787 if (h == NULL) {
|
|
|
788 return NGX_ERROR;
|
|
|
789 }
|
|
|
790
|
|
|
791 *h = ngx_http_limit_req_handler;
|
|
|
792
|
|
|
793 return NGX_OK;
|
|
|
794 }
|
