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570
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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 uint32_t percent;
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14 ngx_http_variable_value_t value;
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15 } ngx_http_split_clients_part_t;
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16
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17
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18 typedef struct {
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19 ngx_http_complex_value_t value;
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20 ngx_array_t parts;
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21 } ngx_http_split_clients_ctx_t;
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22
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23
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24 static char *ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd,
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25 void *conf);
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26 static char *ngx_http_split_clients(ngx_conf_t *cf, ngx_command_t *dummy,
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27 void *conf);
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28
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29 static ngx_command_t ngx_http_split_clients_commands[] = {
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30
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31 { ngx_string("split_clients"),
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32 NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2,
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33 ngx_conf_split_clients_block,
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34 NGX_HTTP_MAIN_CONF_OFFSET,
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35 0,
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36 NULL },
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37
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38 ngx_null_command
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39 };
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40
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41
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42 static ngx_http_module_t ngx_http_split_clients_module_ctx = {
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43 NULL, /* preconfiguration */
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44 NULL, /* postconfiguration */
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45
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46 NULL, /* create main configuration */
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47 NULL, /* init main configuration */
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48
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49 NULL, /* create server configuration */
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50 NULL, /* merge server configuration */
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51
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52 NULL, /* create location configuration */
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53 NULL /* merge location configuration */
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54 };
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55
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56
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57 ngx_module_t ngx_http_split_clients_module = {
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58 NGX_MODULE_V1,
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59 &ngx_http_split_clients_module_ctx, /* module context */
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60 ngx_http_split_clients_commands, /* module directives */
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61 NGX_HTTP_MODULE, /* module type */
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62 NULL, /* init master */
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63 NULL, /* init module */
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64 NULL, /* init process */
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65 NULL, /* init thread */
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66 NULL, /* exit thread */
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67 NULL, /* exit process */
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68 NULL, /* exit master */
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69 NGX_MODULE_V1_PADDING
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70 };
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71
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72
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73 static ngx_int_t
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74 ngx_http_split_clients_variable(ngx_http_request_t *r,
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75 ngx_http_variable_value_t *v, uintptr_t data)
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76 {
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77 ngx_http_split_clients_ctx_t *ctx = (ngx_http_split_clients_ctx_t *) data;
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78
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79 uint32_t hash;
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80 ngx_str_t val;
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81 ngx_uint_t i;
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82 ngx_http_split_clients_part_t *part;
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83
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84 *v = ngx_http_variable_null_value;
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85
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86 if (ngx_http_complex_value(r, &ctx->value, &val) != NGX_OK) {
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87 return NGX_OK;
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88 }
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89
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90 hash = ngx_crc32_short(val.data, val.len);
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91
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92 part = ctx->parts.elts;
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93
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94 for (i = 0; i < ctx->parts.nelts; i++) {
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95
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96 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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97 "%D %D", hash, part[i].percent);
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98
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99 if (hash < part[i].percent) {
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100 *v = part[i].value;
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101 return NGX_OK;
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102 }
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103 }
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104
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105 return NGX_OK;
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106 }
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107
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108
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109 static char *
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110 ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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111 {
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112 char *rv;
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113 ngx_str_t *value, name;
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114 ngx_uint_t i, sum, last;
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115 ngx_conf_t save;
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116 ngx_http_variable_t *var;
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117 ngx_http_split_clients_ctx_t *ctx;
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118 ngx_http_split_clients_part_t *part;
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119 ngx_http_compile_complex_value_t ccv;
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120
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121 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_split_clients_ctx_t));
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122 if (ctx == NULL) {
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123 return NGX_CONF_ERROR;
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124 }
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125
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126 value = cf->args->elts;
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127
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128 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
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129
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130 ccv.cf = cf;
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131 ccv.value = &value[1];
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132 ccv.complex_value = &ctx->value;
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133
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134 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
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135 return NGX_CONF_ERROR;
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136 }
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137
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138 name = value[2];
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139 name.len--;
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140 name.data++;
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141
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142 var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGEABLE);
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143 if (var == NULL) {
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144 return NGX_CONF_ERROR;
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145 }
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146
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147 var->get_handler = ngx_http_split_clients_variable;
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148 var->data = (uintptr_t) ctx;
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149
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150 if (ngx_array_init(&ctx->parts, cf->pool, 2,
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151 sizeof(ngx_http_split_clients_part_t))
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152 != NGX_OK)
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153 {
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154 return NGX_CONF_ERROR;
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155 }
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156
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157 save = *cf;
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158 cf->ctx = ctx;
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159 cf->handler = ngx_http_split_clients;
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160 cf->handler_conf = conf;
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161
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162 rv = ngx_conf_parse(cf, NULL);
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163
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164 *cf = save;
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165
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166 if (rv != NGX_CONF_OK) {
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167 return rv;
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168 }
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169
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170 sum = 0;
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171 last = 0;
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172 part = ctx->parts.elts;
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173
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174 for (i = 0; i < ctx->parts.nelts; i++) {
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175 sum = part[i].percent ? sum + part[i].percent : 10000;
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176 if (sum > 10000) {
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177 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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178 "percent sum is more than 100%%");
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179 return NGX_CONF_ERROR;
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180 }
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181
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182 if (part[i].percent) {
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183 part[i].percent = (uint32_t)
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184 (last + 0xffffffff / 10000 * part[i].percent);
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185 } else {
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186 part[i].percent = 0xffffffff;
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187 }
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188
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189 last = part[i].percent;
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190 }
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191
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192 return rv;
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193 }
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194
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195
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196 static char *
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197 ngx_http_split_clients(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
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198 {
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199 ngx_int_t n;
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200 ngx_str_t *value;
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201 ngx_http_split_clients_ctx_t *ctx;
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202 ngx_http_split_clients_part_t *part;
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203
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204 ctx = cf->ctx;
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205 value = cf->args->elts;
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206
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207 part = ngx_array_push(&ctx->parts);
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208 if (part == NULL) {
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209 return NGX_CONF_ERROR;
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210 }
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211
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212 if (value[0].len == 1 && value[0].data[0] == '*') {
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213 part->percent = 0;
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214
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215 } else {
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216 if (value[0].data[value[0].len - 1] != '%') {
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217 goto invalid;
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218 }
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219
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220 n = ngx_atofp(value[0].data, value[0].len - 1, 2);
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221 if (n == NGX_ERROR || n == 0) {
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222 goto invalid;
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223 }
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224
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225 part->percent = (uint32_t) n;
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226 }
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227
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228 part->value.len = value[1].len;
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229 part->value.valid = 1;
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230 part->value.no_cacheable = 0;
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231 part->value.not_found = 0;
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232 part->value.data = value[1].data;
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233
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234 return NGX_CONF_OK;
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235
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236 invalid:
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237
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238 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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239 "invalid percent value \"%V\"", &value[0]);
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240 return NGX_CONF_ERROR;
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241 }
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