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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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420
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18 ngx_uint_t excess; /* integer value, 1 corresponds to 0.001 r/s */
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416
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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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420
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27 ngx_uint_t rate; /* integer value, 1 corresponds to 0.001 r/s */
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416
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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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420
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35 ngx_uint_t burst; /* integer value, 1 corresponds to 0.001 r/s */
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36 ngx_uint_t nodelay;/* unsigned nodelay:1 */
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416
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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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426
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41 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf,
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42 ngx_uint_t hash, u_char *data, size_t len, ngx_http_limit_req_node_t **lrp);
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416
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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 size_t len, n;
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111 uint32_t hash;
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112 ngx_int_t rc;
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420
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113 ngx_uint_t excess;
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416
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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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426
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118 ngx_http_limit_req_node_t *lr;
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119 ngx_http_limit_req_conf_t *lrcf;
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416
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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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426
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125 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module);
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416
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126
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426
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127 if (lrcf->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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426
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131 ctx = lrcf->shm_zone->data;
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416
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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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426
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161 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &lr);
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416
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162
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426
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163 if (lr) {
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164 ngx_queue_remove(&lr->queue);
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416
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165
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426
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166 ngx_queue_insert_head(ctx->queue, &lr->queue);
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167
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426
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168 excess = lr->excess;
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416
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169
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170 } else {
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420
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171 excess = 0;
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416
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172 }
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173
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420
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174 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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175 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000);
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416
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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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426
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181 "limiting requests, excess: %ui.%03ui by zone \"%V\"",
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182 excess / 1000, excess % 1000, &lrcf->shm_zone->name);
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416
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183
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184 return NGX_HTTP_SERVICE_UNAVAILABLE;
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185 }
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186
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187 if (rc == NGX_AGAIN) {
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188 ngx_shmtx_unlock(&ctx->shpool->mutex);
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189
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426
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190 if (lrcf->nodelay) {
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418
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191 return NGX_DECLINED;
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416
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192 }
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193
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418
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194 ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,
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426
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195 "delaying request, excess: %ui.%03ui, by zone \"%V\"",
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196 excess / 1000, excess % 1000, &lrcf->shm_zone->name);
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418
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197
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198 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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199 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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200 }
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201
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202 r->read_event_handler = ngx_http_test_reading;
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203 r->write_event_handler = ngx_http_limit_req_delay;
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420
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204 ngx_add_timer(r->connection->write, (ngx_msec_t) excess);
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418
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205
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206 return NGX_AGAIN;
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416
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207 }
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208
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209 if (rc == NGX_OK) {
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210 goto done;
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211 }
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212
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213 /* rc == NGX_DECLINED */
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214
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215 n = offsetof(ngx_rbtree_node_t, color)
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216 + offsetof(ngx_http_limit_req_node_t, data)
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217 + len;
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218
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219 node = ngx_slab_alloc_locked(ctx->shpool, n);
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220 if (node == NULL) {
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221
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222 ngx_http_limit_req_expire(ctx, 0);
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223
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224 node = ngx_slab_alloc_locked(ctx->shpool, n);
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225 if (node == NULL) {
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226 ngx_shmtx_unlock(&ctx->shpool->mutex);
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426
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227
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228 ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
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229 "could not allocate memory in zone \"%V\"",
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230 &lrcf->shm_zone->name);
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231
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416
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232 return NGX_HTTP_SERVICE_UNAVAILABLE;
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233 }
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234 }
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235
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426
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236 lr = (ngx_http_limit_req_node_t *) &node->color;
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416
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237
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238 node->key = hash;
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426
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239 lr->len = (u_char) len;
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416
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240
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241 tp = ngx_timeofday();
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426
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242 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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416
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243
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426
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244 lr->excess = 0;
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245 ngx_memcpy(lr->data, vv->data, len);
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416
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246
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247 ngx_rbtree_insert(ctx->rbtree, node);
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248
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426
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249 ngx_queue_insert_head(ctx->queue, &lr->queue);
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416
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250
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251 done:
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252
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253 ngx_shmtx_unlock(&ctx->shpool->mutex);
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254
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255 return NGX_DECLINED;
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256 }
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257
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258
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259 static void
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260 ngx_http_limit_req_delay(ngx_http_request_t *r)
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261 {
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262 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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263 "limit_req delay");
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264
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265 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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266 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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267 return;
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268 }
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269
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270 r->read_event_handler = ngx_http_block_reading;
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271 r->write_event_handler = ngx_http_core_run_phases;
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272
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273 ngx_http_core_run_phases(r);
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274 }
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275
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276
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277 static void
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278 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp,
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279 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
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280 {
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281 ngx_rbtree_node_t **p;
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426
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282 ngx_http_limit_req_node_t *lrn, *lrnt;
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416
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283
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284 for ( ;; ) {
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285
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286 if (node->key < temp->key) {
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287
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288 p = &temp->left;
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289
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290 } else if (node->key > temp->key) {
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291
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292 p = &temp->right;
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293
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294 } else { /* node->key == temp->key */
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295
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426
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296 lrn = (ngx_http_limit_req_node_t *) &node->color;
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297 lrnt = (ngx_http_limit_req_node_t *) &temp->color;
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416
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298
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426
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299 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0)
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416
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300 ? &temp->left : &temp->right;
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301 }
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302
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303 if (*p == sentinel) {
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304 break;
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305 }
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306
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307 temp = *p;
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308 }
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309
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310 *p = node;
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311 node->parent = temp;
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312 node->left = sentinel;
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313 node->right = sentinel;
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314 ngx_rbt_red(node);
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315 }
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316
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317
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318 static ngx_int_t
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426
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319 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash,
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320 u_char *data, size_t len, ngx_http_limit_req_node_t **lrp)
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416
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321 {
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420
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322 ngx_int_t rc, excess;
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416
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323 ngx_time_t *tp;
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324 ngx_msec_t now;
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325 ngx_msec_int_t ms;
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326 ngx_rbtree_node_t *node, *sentinel;
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327 ngx_http_limit_req_ctx_t *ctx;
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426
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328 ngx_http_limit_req_node_t *lr;
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416
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329
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426
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330 ctx = lrcf->shm_zone->data;
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416
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331
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332 node = ctx->rbtree->root;
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333 sentinel = ctx->rbtree->sentinel;
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334
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335 while (node != sentinel) {
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336
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337 if (hash < node->key) {
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338 node = node->left;
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339 continue;
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340 }
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341
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342 if (hash > node->key) {
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343 node = node->right;
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344 continue;
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345 }
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346
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347 /* hash == node->key */
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348
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349 do {
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426
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350 lr = (ngx_http_limit_req_node_t *) &node->color;
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416
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351
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426
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352 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len);
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416
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353
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354 if (rc == 0) {
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355
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356 tp = ngx_timeofday();
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357
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358 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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426
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359 ms = (ngx_msec_int_t) (now - lr->last);
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416
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360
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426
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361 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000;
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416
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362
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420
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363 if (excess < 0) {
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364 excess = 0;
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416
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365 }
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366
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426
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367 lr->excess = excess;
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368 lr->last = now;
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416
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369
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426
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370 *lrp = lr;
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416
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371
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426
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372 if ((ngx_uint_t) excess > lrcf->burst) {
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416
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373 return NGX_BUSY;
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374 }
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375
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420
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376 if (excess) {
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416
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377 return NGX_AGAIN;
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378 }
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379
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380 return NGX_OK;
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381 }
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382
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383 node = (rc < 0) ? node->left : node->right;
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384
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385 } while (node != sentinel && hash == node->key);
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386
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387 break;
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388 }
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389
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426
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390 *lrp = NULL;
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416
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391
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392 return NGX_DECLINED;
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393 }
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394
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395
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396 static void
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397 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n)
|
|
|
398 {
|
|
420
|
399 ngx_int_t excess;
|
|
416
|
400 ngx_time_t *tp;
|
|
|
401 ngx_msec_t now;
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|
|
402 ngx_queue_t *q;
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|
|
403 ngx_msec_int_t ms;
|
|
|
404 ngx_rbtree_node_t *node;
|
|
426
|
405 ngx_http_limit_req_node_t *lr;
|
|
416
|
406
|
|
|
407 tp = ngx_timeofday();
|
|
|
408
|
|
|
409 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
|
|
|
410
|
|
|
411 /*
|
|
|
412 * n == 1 deletes one or two zero rate entries
|
|
|
413 * n == 0 deletes oldest entry by force
|
|
|
414 * and one or two zero rate entries
|
|
|
415 */
|
|
|
416
|
|
|
417 while (n < 3) {
|
|
|
418
|
|
|
419 if (ngx_queue_empty(ctx->queue)) {
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|
|
420 return;
|
|
|
421 }
|
|
|
422
|
|
|
423 q = ngx_queue_last(ctx->queue);
|
|
|
424
|
|
426
|
425 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue);
|
|
416
|
426
|
|
|
427 if (n++ != 0) {
|
|
|
428
|
|
426
|
429 ms = (ngx_msec_int_t) (now - lr->last);
|
|
416
|
430 ms = ngx_abs(ms);
|
|
|
431
|
|
|
432 if (ms < 60000) {
|
|
|
433 return;
|
|
|
434 }
|
|
|
435
|
|
426
|
436 excess = lr->excess - ctx->rate * ms / 1000;
|
|
416
|
437
|
|
420
|
438 if (excess > 0) {
|
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416
|
439 return;
|
|
|
440 }
|
|
|
441 }
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|
|
442
|
|
|
443 ngx_queue_remove(q);
|
|
|
444
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|
|
445 node = (ngx_rbtree_node_t *)
|
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426
|
446 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color));
|
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416
|
447
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|
|
448 ngx_rbtree_delete(ctx->rbtree, node);
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|
|
449
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|
|
450 ngx_slab_free_locked(ctx->shpool, node);
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|
|
451 }
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|
|
452 }
|
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453
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|
454
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|
|
455 static ngx_int_t
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|
|
456 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data)
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|
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457 {
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|
|
458 ngx_http_limit_req_ctx_t *octx = data;
|
|
|
459
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|
|
460 ngx_rbtree_node_t *sentinel;
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|
|
461 ngx_http_limit_req_ctx_t *ctx;
|
|
|
462
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|
|
463 ctx = shm_zone->data;
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|
|
464
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|
|
465 if (octx) {
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|
|
466 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) {
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|
|
467 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
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|
|
468 "limit_req \"%V\" uses the \"%V\" variable "
|
|
|
469 "while previously it used the \"%V\" variable",
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|
|
470 &shm_zone->name, &ctx->var, &octx->var);
|
|
|
471 return NGX_ERROR;
|
|
|
472 }
|
|
|
473
|
|
|
474 ctx->rbtree = octx->rbtree;
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|
|
475 ctx->queue = octx->queue;
|
|
|
476 ctx->shpool = octx->shpool;
|
|
|
477
|
|
|
478 return NGX_OK;
|
|
|
479 }
|
|
|
480
|
|
|
481 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
|
|
|
482
|
|
|
483 ctx->rbtree = ngx_slab_alloc(ctx->shpool, sizeof(ngx_rbtree_t));
|
|
|
484 if (ctx->rbtree == NULL) {
|
|
|
485 return NGX_ERROR;
|
|
|
486 }
|
|
|
487
|
|
|
488 sentinel = ngx_slab_alloc(ctx->shpool, sizeof(ngx_rbtree_node_t));
|
|
|
489 if (sentinel == NULL) {
|
|
|
490 return NGX_ERROR;
|
|
|
491 }
|
|
|
492
|
|
|
493 ngx_rbtree_init(ctx->rbtree, sentinel,
|
|
|
494 ngx_http_limit_req_rbtree_insert_value);
|
|
|
495
|
|
|
496 ctx->queue = ngx_slab_alloc(ctx->shpool, sizeof(ngx_queue_t));
|
|
|
497 if (ctx->queue == NULL) {
|
|
|
498 return NGX_ERROR;
|
|
|
499 }
|
|
|
500
|
|
|
501 ngx_queue_init(ctx->queue);
|
|
|
502
|
|
|
503 return NGX_OK;
|
|
|
504 }
|
|
|
505
|
|
|
506
|
|
|
507 static void *
|
|
|
508 ngx_http_limit_req_create_conf(ngx_conf_t *cf)
|
|
|
509 {
|
|
|
510 ngx_http_limit_req_conf_t *conf;
|
|
|
511
|
|
|
512 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t));
|
|
|
513 if (conf == NULL) {
|
|
|
514 return NGX_CONF_ERROR;
|
|
|
515 }
|
|
|
516
|
|
|
517 /*
|
|
|
518 * set by ngx_pcalloc():
|
|
|
519 *
|
|
|
520 * conf->shm_zone = NULL;
|
|
426
|
521 * conf->burst = 0;
|
|
418
|
522 * conf->nodelay = 0;
|
|
416
|
523 */
|
|
|
524
|
|
|
525 return conf;
|
|
|
526 }
|
|
|
527
|
|
|
528
|
|
|
529 static char *
|
|
|
530 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
531 {
|
|
|
532 ngx_http_limit_req_conf_t *prev = parent;
|
|
|
533 ngx_http_limit_req_conf_t *conf = child;
|
|
|
534
|
|
|
535 if (conf->shm_zone == NULL) {
|
|
|
536 *conf = *prev;
|
|
|
537 }
|
|
|
538
|
|
|
539 return NGX_CONF_OK;
|
|
|
540 }
|
|
|
541
|
|
|
542
|
|
|
543 static char *
|
|
|
544 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
545 {
|
|
|
546 u_char *p;
|
|
|
547 size_t size, len;
|
|
|
548 ngx_str_t *value, name, s;
|
|
|
549 ngx_int_t rate, scale;
|
|
|
550 ngx_uint_t i;
|
|
|
551 ngx_shm_zone_t *shm_zone;
|
|
|
552 ngx_http_limit_req_ctx_t *ctx;
|
|
|
553
|
|
|
554 value = cf->args->elts;
|
|
|
555
|
|
|
556 ctx = NULL;
|
|
|
557 size = 0;
|
|
|
558 rate = 1;
|
|
|
559 scale = 1;
|
|
|
560 name.len = 0;
|
|
|
561
|
|
|
562 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
563
|
|
|
564 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
565
|
|
|
566 name.data = value[i].data + 5;
|
|
|
567
|
|
|
568 p = (u_char *) ngx_strchr(name.data, ':');
|
|
|
569
|
|
|
570 if (p) {
|
|
|
571 name.len = p - name.data;
|
|
|
572
|
|
|
573 p++;
|
|
|
574
|
|
|
575 s.len = value[i].data + value[i].len - p;
|
|
|
576 s.data = p;
|
|
|
577
|
|
|
578 size = ngx_parse_size(&s);
|
|
|
579 if (size > 8191) {
|
|
|
580 continue;
|
|
|
581 }
|
|
|
582 }
|
|
|
583
|
|
|
584 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
585 "invalid zone size \"%V\"", &value[i]);
|
|
|
586 return NGX_CONF_ERROR;
|
|
|
587 }
|
|
|
588
|
|
|
589 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) {
|
|
|
590
|
|
|
591 len = value[i].len;
|
|
|
592 p = value[i].data + len - 3;
|
|
|
593
|
|
|
594 if (ngx_strncmp(p, "r/s", 3) == 0) {
|
|
|
595 scale = 1;
|
|
|
596 len -= 3;
|
|
|
597
|
|
|
598 } else if (ngx_strncmp(p, "r/m", 3) == 0) {
|
|
|
599 scale = 60;
|
|
|
600 len -= 3;
|
|
|
601 }
|
|
|
602
|
|
|
603 rate = ngx_atoi(value[i].data + 5, len - 5);
|
|
|
604 if (rate <= NGX_ERROR) {
|
|
|
605 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
606 "invalid rate \"%V\"", &value[i]);
|
|
|
607 return NGX_CONF_ERROR;
|
|
|
608 }
|
|
|
609
|
|
|
610 continue;
|
|
|
611 }
|
|
|
612
|
|
|
613 if (value[i].data[0] == '$') {
|
|
|
614
|
|
|
615 value[i].len--;
|
|
|
616 value[i].data++;
|
|
|
617
|
|
|
618 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t));
|
|
|
619 if (ctx == NULL) {
|
|
|
620 return NGX_CONF_ERROR;
|
|
|
621 }
|
|
|
622
|
|
|
623 ctx->index = ngx_http_get_variable_index(cf, &value[i]);
|
|
|
624 if (ctx->index == NGX_ERROR) {
|
|
|
625 return NGX_CONF_ERROR;
|
|
|
626 }
|
|
|
627
|
|
|
628 ctx->var = value[i];
|
|
|
629
|
|
|
630 continue;
|
|
|
631 }
|
|
|
632
|
|
|
633 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
634 "invalid parameter \"%V\"", &value[i]);
|
|
|
635 return NGX_CONF_ERROR;
|
|
|
636 }
|
|
|
637
|
|
|
638 if (name.len == 0 || size == 0) {
|
|
|
639 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
640 "\"%V\" must have \"zone\" parameter",
|
|
|
641 &cmd->name);
|
|
|
642 return NGX_CONF_ERROR;
|
|
|
643 }
|
|
|
644
|
|
|
645 if (ctx == NULL) {
|
|
|
646 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
647 "no variable is defined for limit_req_zone \"%V\"",
|
|
|
648 &cmd->name);
|
|
|
649 return NGX_CONF_ERROR;
|
|
|
650 }
|
|
|
651
|
|
420
|
652 ctx->rate = rate * 1000 / scale;
|
|
416
|
653
|
|
|
654 shm_zone = ngx_shared_memory_add(cf, &name, size,
|
|
|
655 &ngx_http_limit_req_module);
|
|
|
656 if (shm_zone == NULL) {
|
|
|
657 return NGX_CONF_ERROR;
|
|
|
658 }
|
|
|
659
|
|
|
660 if (shm_zone->data) {
|
|
|
661 ctx = shm_zone->data;
|
|
|
662
|
|
|
663 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
664 "limit_req_zone \"%V\" is already bound to variable \"%V\"",
|
|
|
665 &value[1], &ctx->var);
|
|
|
666 return NGX_CONF_ERROR;
|
|
|
667 }
|
|
|
668
|
|
|
669 shm_zone->init = ngx_http_limit_req_init_zone;
|
|
|
670 shm_zone->data = ctx;
|
|
|
671
|
|
|
672 return NGX_CONF_OK;
|
|
|
673 }
|
|
|
674
|
|
|
675
|
|
|
676 static char *
|
|
|
677 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
678 {
|
|
426
|
679 ngx_http_limit_req_conf_t *lrcf = conf;
|
|
416
|
680
|
|
418
|
681 ngx_int_t burst;
|
|
|
682 ngx_str_t *value, s;
|
|
|
683 ngx_uint_t i;
|
|
416
|
684
|
|
426
|
685 if (lrcf->shm_zone) {
|
|
416
|
686 return "is duplicate";
|
|
|
687 }
|
|
|
688
|
|
|
689 value = cf->args->elts;
|
|
|
690
|
|
|
691 burst = 0;
|
|
|
692
|
|
|
693 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
694
|
|
|
695 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
696
|
|
|
697 s.len = value[i].len - 5;
|
|
|
698 s.data = value[i].data + 5;
|
|
|
699
|
|
426
|
700 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0,
|
|
416
|
701 &ngx_http_limit_req_module);
|
|
426
|
702 if (lrcf->shm_zone == NULL) {
|
|
416
|
703 return NGX_CONF_ERROR;
|
|
|
704 }
|
|
|
705
|
|
|
706 continue;
|
|
|
707 }
|
|
|
708
|
|
|
709 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) {
|
|
|
710
|
|
418
|
711 burst = ngx_atoi(value[i].data + 6, value[i].len - 6);
|
|
416
|
712 if (burst <= 0) {
|
|
|
713 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
714 "invalid burst rate \"%V\"", &value[i]);
|
|
|
715 return NGX_CONF_ERROR;
|
|
|
716 }
|
|
|
717
|
|
|
718 continue;
|
|
|
719 }
|
|
|
720
|
|
418
|
721 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) {
|
|
426
|
722 lrcf->nodelay = 1;
|
|
416
|
723 continue;
|
|
|
724 }
|
|
|
725
|
|
|
726 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
727 "invalid parameter \"%V\"", &value[i]);
|
|
|
728 return NGX_CONF_ERROR;
|
|
|
729 }
|
|
|
730
|
|
426
|
731 if (lrcf->shm_zone == NULL) {
|
|
416
|
732 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
733 "\"%V\" must have \"zone\" parameter",
|
|
|
734 &cmd->name);
|
|
|
735 return NGX_CONF_ERROR;
|
|
|
736 }
|
|
|
737
|
|
426
|
738 if (lrcf->shm_zone->data == NULL) {
|
|
416
|
739 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
740 "unknown limit_req_zone \"%V\"",
|
|
426
|
741 &lrcf->shm_zone->name);
|
|
416
|
742 return NGX_CONF_ERROR;
|
|
|
743 }
|
|
|
744
|
|
426
|
745 lrcf->burst = burst * 1000;
|
|
416
|
746
|
|
|
747 return NGX_CONF_OK;
|
|
|
748 }
|
|
|
749
|
|
|
750
|
|
|
751 static ngx_int_t
|
|
|
752 ngx_http_limit_req_init(ngx_conf_t *cf)
|
|
|
753 {
|
|
|
754 ngx_http_handler_pt *h;
|
|
|
755 ngx_http_core_main_conf_t *cmcf;
|
|
|
756
|
|
|
757 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
|
758
|
|
|
759 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
|
760 if (h == NULL) {
|
|
|
761 return NGX_ERROR;
|
|
|
762 }
|
|
|
763
|
|
|
764 *h = ngx_http_limit_req_handler;
|
|
|
765
|
|
|
766 return NGX_OK;
|
|
|
767 }
|
