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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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480
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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 /* integer value, 1 corresponds to 0.001 r/s */
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19 ngx_uint_t excess;
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20 u_char data[1];
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416
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21 } ngx_http_limit_req_node_t;
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22
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23
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24 typedef struct {
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480
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25 ngx_rbtree_t rbtree;
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26 ngx_rbtree_node_t sentinel;
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27 ngx_queue_t queue;
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28 } ngx_http_limit_req_shctx_t;
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29
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30
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31 typedef struct {
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32 ngx_http_limit_req_shctx_t *sh;
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33 ngx_slab_pool_t *shpool;
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34 /* integer value, 1 corresponds to 0.001 r/s */
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35 ngx_uint_t rate;
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36 ngx_int_t index;
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37 ngx_str_t var;
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416
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38 } ngx_http_limit_req_ctx_t;
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39
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40
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41 typedef struct {
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480
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42 ngx_shm_zone_t *shm_zone;
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43 /* integer value, 1 corresponds to 0.001 r/s */
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44 ngx_uint_t burst;
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45 ngx_uint_t nodelay;/* unsigned nodelay:1 */
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416
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46 } ngx_http_limit_req_conf_t;
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47
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48
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49 static void ngx_http_limit_req_delay(ngx_http_request_t *r);
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426
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50 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf,
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51 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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52 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx,
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53 ngx_uint_t n);
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54
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55 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf);
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56 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent,
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57 void *child);
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58 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd,
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59 void *conf);
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60 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd,
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61 void *conf);
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62 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf);
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63
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64
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65 static ngx_command_t ngx_http_limit_req_commands[] = {
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66
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67 { ngx_string("limit_req_zone"),
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68 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3,
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69 ngx_http_limit_req_zone,
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70 0,
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71 0,
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72 NULL },
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73
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74 { ngx_string("limit_req"),
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75 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123,
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76 ngx_http_limit_req,
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77 NGX_HTTP_LOC_CONF_OFFSET,
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78 0,
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79 NULL },
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80
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81 ngx_null_command
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82 };
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83
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84
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85 static ngx_http_module_t ngx_http_limit_req_module_ctx = {
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86 NULL, /* preconfiguration */
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87 ngx_http_limit_req_init, /* postconfiguration */
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88
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89 NULL, /* create main configuration */
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90 NULL, /* init main configuration */
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91
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92 NULL, /* create server configuration */
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93 NULL, /* merge server configuration */
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94
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95 ngx_http_limit_req_create_conf, /* create location configration */
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96 ngx_http_limit_req_merge_conf /* merge location configration */
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97 };
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98
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99
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100 ngx_module_t ngx_http_limit_req_module = {
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101 NGX_MODULE_V1,
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102 &ngx_http_limit_req_module_ctx, /* module context */
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103 ngx_http_limit_req_commands, /* module directives */
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104 NGX_HTTP_MODULE, /* module type */
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105 NULL, /* init master */
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106 NULL, /* init module */
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107 NULL, /* init process */
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108 NULL, /* init thread */
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109 NULL, /* exit thread */
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110 NULL, /* exit process */
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111 NULL, /* exit master */
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112 NGX_MODULE_V1_PADDING
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113 };
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114
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115
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116 static ngx_int_t
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117 ngx_http_limit_req_handler(ngx_http_request_t *r)
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118 {
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119 size_t len, n;
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120 uint32_t hash;
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121 ngx_int_t rc;
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420
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122 ngx_uint_t excess;
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416
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123 ngx_time_t *tp;
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124 ngx_rbtree_node_t *node;
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125 ngx_http_variable_value_t *vv;
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126 ngx_http_limit_req_ctx_t *ctx;
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426
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127 ngx_http_limit_req_node_t *lr;
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128 ngx_http_limit_req_conf_t *lrcf;
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416
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129
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130 if (r->main->limit_req_set) {
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131 return NGX_DECLINED;
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132 }
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133
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426
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134 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module);
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416
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135
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426
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136 if (lrcf->shm_zone == NULL) {
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416
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137 return NGX_DECLINED;
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138 }
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139
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426
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140 ctx = lrcf->shm_zone->data;
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416
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141
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142 vv = ngx_http_get_indexed_variable(r, ctx->index);
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143
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144 if (vv == NULL || vv->not_found) {
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145 return NGX_DECLINED;
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146 }
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147
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148 len = vv->len;
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149
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150 if (len == 0) {
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151 return NGX_DECLINED;
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152 }
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153
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154 if (len > 65535) {
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155 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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156 "the value of the \"%V\" variable "
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157 "is more than 65535 bytes: \"%v\"",
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158 &ctx->var, vv);
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159 return NGX_DECLINED;
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160 }
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161
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162 r->main->limit_req_set = 1;
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163
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164 hash = ngx_crc32_short(vv->data, len);
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165
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166 ngx_shmtx_lock(&ctx->shpool->mutex);
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167
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168 ngx_http_limit_req_expire(ctx, 1);
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169
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426
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170 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &lr);
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416
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171
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426
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172 if (lr) {
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173 ngx_queue_remove(&lr->queue);
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416
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174
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480
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175 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
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416
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176
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426
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177 excess = lr->excess;
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416
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178
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179 } else {
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420
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180 excess = 0;
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416
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181 }
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182
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420
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183 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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184 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000);
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416
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185
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186 if (rc == NGX_BUSY) {
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187 ngx_shmtx_unlock(&ctx->shpool->mutex);
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188
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189 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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426
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190 "limiting requests, excess: %ui.%03ui by zone \"%V\"",
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480
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191 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
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416
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192
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193 return NGX_HTTP_SERVICE_UNAVAILABLE;
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194 }
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195
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196 if (rc == NGX_AGAIN) {
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197 ngx_shmtx_unlock(&ctx->shpool->mutex);
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198
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426
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199 if (lrcf->nodelay) {
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418
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200 return NGX_DECLINED;
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416
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201 }
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202
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418
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203 ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,
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426
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204 "delaying request, excess: %ui.%03ui, by zone \"%V\"",
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480
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205 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
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418
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206
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207 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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208 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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209 }
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210
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211 r->read_event_handler = ngx_http_test_reading;
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212 r->write_event_handler = ngx_http_limit_req_delay;
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420
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213 ngx_add_timer(r->connection->write, (ngx_msec_t) excess);
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418
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214
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215 return NGX_AGAIN;
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416
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216 }
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217
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218 if (rc == NGX_OK) {
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219 goto done;
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220 }
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221
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222 /* rc == NGX_DECLINED */
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223
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224 n = offsetof(ngx_rbtree_node_t, color)
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225 + offsetof(ngx_http_limit_req_node_t, data)
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226 + len;
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227
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228 node = ngx_slab_alloc_locked(ctx->shpool, n);
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229 if (node == NULL) {
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230
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231 ngx_http_limit_req_expire(ctx, 0);
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232
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233 node = ngx_slab_alloc_locked(ctx->shpool, n);
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234 if (node == NULL) {
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235 ngx_shmtx_unlock(&ctx->shpool->mutex);
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236 return NGX_HTTP_SERVICE_UNAVAILABLE;
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237 }
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238 }
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239
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426
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240 lr = (ngx_http_limit_req_node_t *) &node->color;
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416
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241
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242 node->key = hash;
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426
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243 lr->len = (u_char) len;
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416
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244
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245 tp = ngx_timeofday();
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426
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246 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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416
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247
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426
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248 lr->excess = 0;
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249 ngx_memcpy(lr->data, vv->data, len);
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416
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250
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480
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251 ngx_rbtree_insert(&ctx->sh->rbtree, node);
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416
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252
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480
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253 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
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416
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254
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255 done:
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256
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257 ngx_shmtx_unlock(&ctx->shpool->mutex);
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258
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259 return NGX_DECLINED;
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260 }
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261
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262
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263 static void
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264 ngx_http_limit_req_delay(ngx_http_request_t *r)
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265 {
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266 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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267 "limit_req delay");
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268
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269 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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270 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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271 return;
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272 }
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273
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274 r->read_event_handler = ngx_http_block_reading;
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275 r->write_event_handler = ngx_http_core_run_phases;
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276
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277 ngx_http_core_run_phases(r);
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278 }
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279
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280
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281 static void
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282 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp,
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283 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
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284 {
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285 ngx_rbtree_node_t **p;
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426
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286 ngx_http_limit_req_node_t *lrn, *lrnt;
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416
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287
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288 for ( ;; ) {
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289
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290 if (node->key < temp->key) {
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291
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292 p = &temp->left;
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293
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294 } else if (node->key > temp->key) {
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295
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296 p = &temp->right;
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297
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298 } else { /* node->key == temp->key */
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299
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426
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300 lrn = (ngx_http_limit_req_node_t *) &node->color;
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301 lrnt = (ngx_http_limit_req_node_t *) &temp->color;
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416
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302
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426
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303 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0)
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416
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304 ? &temp->left : &temp->right;
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305 }
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306
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307 if (*p == sentinel) {
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308 break;
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309 }
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310
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311 temp = *p;
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312 }
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313
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314 *p = node;
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315 node->parent = temp;
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316 node->left = sentinel;
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317 node->right = sentinel;
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318 ngx_rbt_red(node);
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319 }
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320
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321
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322 static ngx_int_t
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426
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323 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash,
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324 u_char *data, size_t len, ngx_http_limit_req_node_t **lrp)
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416
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325 {
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420
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326 ngx_int_t rc, excess;
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416
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327 ngx_time_t *tp;
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328 ngx_msec_t now;
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329 ngx_msec_int_t ms;
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330 ngx_rbtree_node_t *node, *sentinel;
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331 ngx_http_limit_req_ctx_t *ctx;
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426
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332 ngx_http_limit_req_node_t *lr;
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416
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333
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426
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334 ctx = lrcf->shm_zone->data;
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416
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335
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480
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336 node = ctx->sh->rbtree.root;
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337 sentinel = ctx->sh->rbtree.sentinel;
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416
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338
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339 while (node != sentinel) {
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340
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341 if (hash < node->key) {
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342 node = node->left;
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343 continue;
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344 }
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345
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346 if (hash > node->key) {
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347 node = node->right;
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348 continue;
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349 }
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350
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351 /* hash == node->key */
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352
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353 do {
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426
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354 lr = (ngx_http_limit_req_node_t *) &node->color;
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416
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355
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426
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356 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len);
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416
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357
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358 if (rc == 0) {
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359
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360 tp = ngx_timeofday();
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361
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362 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
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426
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363 ms = (ngx_msec_int_t) (now - lr->last);
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416
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364
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426
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365 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000;
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416
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366
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420
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367 if (excess < 0) {
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368 excess = 0;
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416
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369 }
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370
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426
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371 lr->excess = excess;
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372 lr->last = now;
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416
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373
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426
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374 *lrp = lr;
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416
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375
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426
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376 if ((ngx_uint_t) excess > lrcf->burst) {
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416
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377 return NGX_BUSY;
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378 }
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379
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420
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380 if (excess) {
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416
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381 return NGX_AGAIN;
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382 }
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383
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384 return NGX_OK;
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385 }
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386
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387 node = (rc < 0) ? node->left : node->right;
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388
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389 } while (node != sentinel && hash == node->key);
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390
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391 break;
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392 }
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393
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426
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394 *lrp = NULL;
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416
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395
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|
|
396 return NGX_DECLINED;
|
|
|
397 }
|
|
|
398
|
|
|
399
|
|
|
400 static void
|
|
|
401 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n)
|
|
|
402 {
|
|
420
|
403 ngx_int_t excess;
|
|
416
|
404 ngx_time_t *tp;
|
|
|
405 ngx_msec_t now;
|
|
|
406 ngx_queue_t *q;
|
|
|
407 ngx_msec_int_t ms;
|
|
|
408 ngx_rbtree_node_t *node;
|
|
426
|
409 ngx_http_limit_req_node_t *lr;
|
|
416
|
410
|
|
|
411 tp = ngx_timeofday();
|
|
|
412
|
|
|
413 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
|
|
|
414
|
|
|
415 /*
|
|
|
416 * n == 1 deletes one or two zero rate entries
|
|
|
417 * n == 0 deletes oldest entry by force
|
|
|
418 * and one or two zero rate entries
|
|
|
419 */
|
|
|
420
|
|
|
421 while (n < 3) {
|
|
|
422
|
|
480
|
423 if (ngx_queue_empty(&ctx->sh->queue)) {
|
|
416
|
424 return;
|
|
|
425 }
|
|
|
426
|
|
480
|
427 q = ngx_queue_last(&ctx->sh->queue);
|
|
416
|
428
|
|
426
|
429 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue);
|
|
416
|
430
|
|
|
431 if (n++ != 0) {
|
|
|
432
|
|
426
|
433 ms = (ngx_msec_int_t) (now - lr->last);
|
|
416
|
434 ms = ngx_abs(ms);
|
|
|
435
|
|
|
436 if (ms < 60000) {
|
|
|
437 return;
|
|
|
438 }
|
|
|
439
|
|
426
|
440 excess = lr->excess - ctx->rate * ms / 1000;
|
|
416
|
441
|
|
420
|
442 if (excess > 0) {
|
|
416
|
443 return;
|
|
|
444 }
|
|
|
445 }
|
|
|
446
|
|
|
447 ngx_queue_remove(q);
|
|
|
448
|
|
|
449 node = (ngx_rbtree_node_t *)
|
|
426
|
450 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color));
|
|
416
|
451
|
|
480
|
452 ngx_rbtree_delete(&ctx->sh->rbtree, node);
|
|
416
|
453
|
|
|
454 ngx_slab_free_locked(ctx->shpool, node);
|
|
|
455 }
|
|
|
456 }
|
|
|
457
|
|
|
458
|
|
|
459 static ngx_int_t
|
|
|
460 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data)
|
|
|
461 {
|
|
|
462 ngx_http_limit_req_ctx_t *octx = data;
|
|
|
463
|
|
468
|
464 size_t len;
|
|
416
|
465 ngx_http_limit_req_ctx_t *ctx;
|
|
|
466
|
|
|
467 ctx = shm_zone->data;
|
|
|
468
|
|
|
469 if (octx) {
|
|
|
470 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) {
|
|
|
471 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
|
|
|
472 "limit_req \"%V\" uses the \"%V\" variable "
|
|
|
473 "while previously it used the \"%V\" variable",
|
|
480
|
474 &shm_zone->shm.name, &ctx->var, &octx->var);
|
|
416
|
475 return NGX_ERROR;
|
|
|
476 }
|
|
|
477
|
|
480
|
478 ctx->sh = octx->sh;
|
|
416
|
479 ctx->shpool = octx->shpool;
|
|
|
480
|
|
|
481 return NGX_OK;
|
|
|
482 }
|
|
|
483
|
|
|
484 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
|
|
|
485
|
|
480
|
486 if (shm_zone->shm.exists) {
|
|
|
487 ctx->sh = ctx->shpool->data;
|
|
|
488
|
|
|
489 return NGX_OK;
|
|
416
|
490 }
|
|
|
491
|
|
480
|
492 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t));
|
|
|
493 if (ctx->sh == NULL) {
|
|
416
|
494 return NGX_ERROR;
|
|
|
495 }
|
|
|
496
|
|
480
|
497 ctx->shpool->data = ctx->sh;
|
|
|
498
|
|
|
499 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel,
|
|
416
|
500 ngx_http_limit_req_rbtree_insert_value);
|
|
|
501
|
|
480
|
502 ngx_queue_init(&ctx->sh->queue);
|
|
416
|
503
|
|
480
|
504 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len;
|
|
468
|
505
|
|
|
506 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len);
|
|
|
507 if (ctx->shpool->log_ctx == NULL) {
|
|
|
508 return NGX_ERROR;
|
|
|
509 }
|
|
|
510
|
|
|
511 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z",
|
|
480
|
512 &shm_zone->shm.name);
|
|
468
|
513
|
|
416
|
514 return NGX_OK;
|
|
|
515 }
|
|
|
516
|
|
|
517
|
|
|
518 static void *
|
|
|
519 ngx_http_limit_req_create_conf(ngx_conf_t *cf)
|
|
|
520 {
|
|
|
521 ngx_http_limit_req_conf_t *conf;
|
|
|
522
|
|
|
523 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t));
|
|
|
524 if (conf == NULL) {
|
|
496
|
525 return NULL;
|
|
416
|
526 }
|
|
|
527
|
|
|
528 /*
|
|
|
529 * set by ngx_pcalloc():
|
|
|
530 *
|
|
|
531 * conf->shm_zone = NULL;
|
|
426
|
532 * conf->burst = 0;
|
|
418
|
533 * conf->nodelay = 0;
|
|
416
|
534 */
|
|
|
535
|
|
|
536 return conf;
|
|
|
537 }
|
|
|
538
|
|
|
539
|
|
|
540 static char *
|
|
|
541 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
|
542 {
|
|
|
543 ngx_http_limit_req_conf_t *prev = parent;
|
|
|
544 ngx_http_limit_req_conf_t *conf = child;
|
|
|
545
|
|
|
546 if (conf->shm_zone == NULL) {
|
|
|
547 *conf = *prev;
|
|
|
548 }
|
|
|
549
|
|
|
550 return NGX_CONF_OK;
|
|
|
551 }
|
|
|
552
|
|
|
553
|
|
|
554 static char *
|
|
|
555 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
556 {
|
|
|
557 u_char *p;
|
|
|
558 size_t size, len;
|
|
|
559 ngx_str_t *value, name, s;
|
|
|
560 ngx_int_t rate, scale;
|
|
|
561 ngx_uint_t i;
|
|
|
562 ngx_shm_zone_t *shm_zone;
|
|
|
563 ngx_http_limit_req_ctx_t *ctx;
|
|
|
564
|
|
|
565 value = cf->args->elts;
|
|
|
566
|
|
|
567 ctx = NULL;
|
|
|
568 size = 0;
|
|
|
569 rate = 1;
|
|
|
570 scale = 1;
|
|
|
571 name.len = 0;
|
|
|
572
|
|
|
573 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
574
|
|
|
575 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
576
|
|
|
577 name.data = value[i].data + 5;
|
|
|
578
|
|
|
579 p = (u_char *) ngx_strchr(name.data, ':');
|
|
|
580
|
|
|
581 if (p) {
|
|
480
|
582 *p = '\0';
|
|
|
583
|
|
416
|
584 name.len = p - name.data;
|
|
|
585
|
|
|
586 p++;
|
|
|
587
|
|
|
588 s.len = value[i].data + value[i].len - p;
|
|
|
589 s.data = p;
|
|
|
590
|
|
|
591 size = ngx_parse_size(&s);
|
|
|
592 if (size > 8191) {
|
|
|
593 continue;
|
|
|
594 }
|
|
|
595 }
|
|
|
596
|
|
|
597 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
598 "invalid zone size \"%V\"", &value[i]);
|
|
|
599 return NGX_CONF_ERROR;
|
|
|
600 }
|
|
|
601
|
|
|
602 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) {
|
|
|
603
|
|
|
604 len = value[i].len;
|
|
|
605 p = value[i].data + len - 3;
|
|
|
606
|
|
|
607 if (ngx_strncmp(p, "r/s", 3) == 0) {
|
|
|
608 scale = 1;
|
|
|
609 len -= 3;
|
|
|
610
|
|
|
611 } else if (ngx_strncmp(p, "r/m", 3) == 0) {
|
|
|
612 scale = 60;
|
|
|
613 len -= 3;
|
|
|
614 }
|
|
|
615
|
|
|
616 rate = ngx_atoi(value[i].data + 5, len - 5);
|
|
|
617 if (rate <= NGX_ERROR) {
|
|
|
618 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
619 "invalid rate \"%V\"", &value[i]);
|
|
|
620 return NGX_CONF_ERROR;
|
|
|
621 }
|
|
|
622
|
|
|
623 continue;
|
|
|
624 }
|
|
|
625
|
|
|
626 if (value[i].data[0] == '$') {
|
|
|
627
|
|
|
628 value[i].len--;
|
|
|
629 value[i].data++;
|
|
|
630
|
|
|
631 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t));
|
|
|
632 if (ctx == NULL) {
|
|
|
633 return NGX_CONF_ERROR;
|
|
|
634 }
|
|
|
635
|
|
|
636 ctx->index = ngx_http_get_variable_index(cf, &value[i]);
|
|
|
637 if (ctx->index == NGX_ERROR) {
|
|
|
638 return NGX_CONF_ERROR;
|
|
|
639 }
|
|
|
640
|
|
|
641 ctx->var = value[i];
|
|
|
642
|
|
|
643 continue;
|
|
|
644 }
|
|
|
645
|
|
|
646 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
647 "invalid parameter \"%V\"", &value[i]);
|
|
|
648 return NGX_CONF_ERROR;
|
|
|
649 }
|
|
|
650
|
|
|
651 if (name.len == 0 || size == 0) {
|
|
|
652 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
653 "\"%V\" must have \"zone\" parameter",
|
|
|
654 &cmd->name);
|
|
|
655 return NGX_CONF_ERROR;
|
|
|
656 }
|
|
|
657
|
|
|
658 if (ctx == NULL) {
|
|
|
659 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
660 "no variable is defined for limit_req_zone \"%V\"",
|
|
|
661 &cmd->name);
|
|
|
662 return NGX_CONF_ERROR;
|
|
|
663 }
|
|
|
664
|
|
420
|
665 ctx->rate = rate * 1000 / scale;
|
|
416
|
666
|
|
|
667 shm_zone = ngx_shared_memory_add(cf, &name, size,
|
|
|
668 &ngx_http_limit_req_module);
|
|
|
669 if (shm_zone == NULL) {
|
|
|
670 return NGX_CONF_ERROR;
|
|
|
671 }
|
|
|
672
|
|
|
673 if (shm_zone->data) {
|
|
|
674 ctx = shm_zone->data;
|
|
|
675
|
|
|
676 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
677 "limit_req_zone \"%V\" is already bound to variable \"%V\"",
|
|
|
678 &value[1], &ctx->var);
|
|
|
679 return NGX_CONF_ERROR;
|
|
|
680 }
|
|
|
681
|
|
|
682 shm_zone->init = ngx_http_limit_req_init_zone;
|
|
|
683 shm_zone->data = ctx;
|
|
|
684
|
|
|
685 return NGX_CONF_OK;
|
|
|
686 }
|
|
|
687
|
|
|
688
|
|
|
689 static char *
|
|
|
690 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
691 {
|
|
426
|
692 ngx_http_limit_req_conf_t *lrcf = conf;
|
|
416
|
693
|
|
418
|
694 ngx_int_t burst;
|
|
|
695 ngx_str_t *value, s;
|
|
|
696 ngx_uint_t i;
|
|
416
|
697
|
|
426
|
698 if (lrcf->shm_zone) {
|
|
416
|
699 return "is duplicate";
|
|
|
700 }
|
|
|
701
|
|
|
702 value = cf->args->elts;
|
|
|
703
|
|
|
704 burst = 0;
|
|
|
705
|
|
|
706 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
707
|
|
|
708 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
|
709
|
|
|
710 s.len = value[i].len - 5;
|
|
|
711 s.data = value[i].data + 5;
|
|
|
712
|
|
426
|
713 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0,
|
|
416
|
714 &ngx_http_limit_req_module);
|
|
426
|
715 if (lrcf->shm_zone == NULL) {
|
|
416
|
716 return NGX_CONF_ERROR;
|
|
|
717 }
|
|
|
718
|
|
|
719 continue;
|
|
|
720 }
|
|
|
721
|
|
|
722 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) {
|
|
|
723
|
|
418
|
724 burst = ngx_atoi(value[i].data + 6, value[i].len - 6);
|
|
416
|
725 if (burst <= 0) {
|
|
|
726 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
727 "invalid burst rate \"%V\"", &value[i]);
|
|
|
728 return NGX_CONF_ERROR;
|
|
|
729 }
|
|
|
730
|
|
|
731 continue;
|
|
|
732 }
|
|
|
733
|
|
418
|
734 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) {
|
|
426
|
735 lrcf->nodelay = 1;
|
|
416
|
736 continue;
|
|
|
737 }
|
|
|
738
|
|
|
739 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
740 "invalid parameter \"%V\"", &value[i]);
|
|
|
741 return NGX_CONF_ERROR;
|
|
|
742 }
|
|
|
743
|
|
426
|
744 if (lrcf->shm_zone == NULL) {
|
|
416
|
745 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
746 "\"%V\" must have \"zone\" parameter",
|
|
|
747 &cmd->name);
|
|
|
748 return NGX_CONF_ERROR;
|
|
|
749 }
|
|
|
750
|
|
426
|
751 if (lrcf->shm_zone->data == NULL) {
|
|
416
|
752 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
753 "unknown limit_req_zone \"%V\"",
|
|
480
|
754 &lrcf->shm_zone->shm.name);
|
|
416
|
755 return NGX_CONF_ERROR;
|
|
|
756 }
|
|
|
757
|
|
426
|
758 lrcf->burst = burst * 1000;
|
|
416
|
759
|
|
|
760 return NGX_CONF_OK;
|
|
|
761 }
|
|
|
762
|
|
|
763
|
|
|
764 static ngx_int_t
|
|
|
765 ngx_http_limit_req_init(ngx_conf_t *cf)
|
|
|
766 {
|
|
|
767 ngx_http_handler_pt *h;
|
|
|
768 ngx_http_core_main_conf_t *cmcf;
|
|
|
769
|
|
|
770 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
|
771
|
|
|
772 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
|
773 if (h == NULL) {
|
|
|
774 return NGX_ERROR;
|
|
|
775 }
|
|
|
776
|
|
|
777 *h = ngx_http_limit_req_handler;
|
|
|
778
|
|
|
779 return NGX_OK;
|
|
|
780 }
|
