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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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660
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4 * Copyright (C) Nginx, Inc.
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570
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 typedef struct {
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14 uint32_t percent;
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15 ngx_http_variable_value_t value;
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16 } ngx_http_split_clients_part_t;
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17
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18
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19 typedef struct {
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20 ngx_http_complex_value_t value;
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21 ngx_array_t parts;
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22 } ngx_http_split_clients_ctx_t;
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23
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24
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25 static char *ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd,
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26 void *conf);
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27 static char *ngx_http_split_clients(ngx_conf_t *cf, ngx_command_t *dummy,
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28 void *conf);
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29
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30 static ngx_command_t ngx_http_split_clients_commands[] = {
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31
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32 { ngx_string("split_clients"),
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33 NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2,
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34 ngx_conf_split_clients_block,
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35 NGX_HTTP_MAIN_CONF_OFFSET,
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36 0,
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37 NULL },
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38
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39 ngx_null_command
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40 };
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41
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42
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43 static ngx_http_module_t ngx_http_split_clients_module_ctx = {
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44 NULL, /* preconfiguration */
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45 NULL, /* postconfiguration */
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46
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47 NULL, /* create main configuration */
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48 NULL, /* init main configuration */
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49
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50 NULL, /* create server configuration */
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51 NULL, /* merge server configuration */
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52
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53 NULL, /* create location configuration */
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54 NULL /* merge location configuration */
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55 };
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56
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57
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58 ngx_module_t ngx_http_split_clients_module = {
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59 NGX_MODULE_V1,
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60 &ngx_http_split_clients_module_ctx, /* module context */
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61 ngx_http_split_clients_commands, /* module directives */
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62 NGX_HTTP_MODULE, /* module type */
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63 NULL, /* init master */
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64 NULL, /* init module */
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65 NULL, /* init process */
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66 NULL, /* init thread */
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67 NULL, /* exit thread */
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68 NULL, /* exit process */
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69 NULL, /* exit master */
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70 NGX_MODULE_V1_PADDING
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71 };
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72
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73
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74 static ngx_int_t
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75 ngx_http_split_clients_variable(ngx_http_request_t *r,
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76 ngx_http_variable_value_t *v, uintptr_t data)
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77 {
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78 ngx_http_split_clients_ctx_t *ctx = (ngx_http_split_clients_ctx_t *) data;
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79
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80 uint32_t hash;
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81 ngx_str_t val;
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82 ngx_uint_t i;
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83 ngx_http_split_clients_part_t *part;
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84
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85 *v = ngx_http_variable_null_value;
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86
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87 if (ngx_http_complex_value(r, &ctx->value, &val) != NGX_OK) {
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88 return NGX_OK;
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89 }
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90
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622
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91 hash = ngx_murmur_hash2(val.data, val.len);
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570
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92
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93 part = ctx->parts.elts;
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94
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95 for (i = 0; i < ctx->parts.nelts; i++) {
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96
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97 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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626
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98 "http split: %uD %uD", hash, part[i].percent);
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570
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99
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100 if (hash < part[i].percent) {
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101 *v = part[i].value;
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102 return NGX_OK;
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103 }
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104 }
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105
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106 return NGX_OK;
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107 }
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108
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109
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110 static char *
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111 ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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112 {
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113 char *rv;
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114 ngx_str_t *value, name;
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115 ngx_uint_t i, sum, last;
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116 ngx_conf_t save;
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117 ngx_http_variable_t *var;
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118 ngx_http_split_clients_ctx_t *ctx;
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119 ngx_http_split_clients_part_t *part;
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120 ngx_http_compile_complex_value_t ccv;
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121
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122 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_split_clients_ctx_t));
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123 if (ctx == NULL) {
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124 return NGX_CONF_ERROR;
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125 }
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126
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127 value = cf->args->elts;
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128
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129 ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
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130
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131 ccv.cf = cf;
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132 ccv.value = &value[1];
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133 ccv.complex_value = &ctx->value;
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134
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135 if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
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136 return NGX_CONF_ERROR;
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137 }
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138
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139 name = value[2];
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140 name.len--;
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141 name.data++;
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142
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143 var = ngx_http_add_variable(cf, &name, NGX_HTTP_VAR_CHANGEABLE);
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144 if (var == NULL) {
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145 return NGX_CONF_ERROR;
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146 }
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147
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148 var->get_handler = ngx_http_split_clients_variable;
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149 var->data = (uintptr_t) ctx;
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150
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151 if (ngx_array_init(&ctx->parts, cf->pool, 2,
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152 sizeof(ngx_http_split_clients_part_t))
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153 != NGX_OK)
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154 {
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155 return NGX_CONF_ERROR;
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156 }
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157
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158 save = *cf;
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159 cf->ctx = ctx;
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160 cf->handler = ngx_http_split_clients;
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161 cf->handler_conf = conf;
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162
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163 rv = ngx_conf_parse(cf, NULL);
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164
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165 *cf = save;
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166
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578
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167 if (rv != NGX_CONF_OK) {
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168 return rv;
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169 }
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170
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570
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171 sum = 0;
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172 last = 0;
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173 part = ctx->parts.elts;
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174
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175 for (i = 0; i < ctx->parts.nelts; i++) {
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176 sum = part[i].percent ? sum + part[i].percent : 10000;
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177 if (sum > 10000) {
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178 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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179 "percent sum is more than 100%%");
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180 return NGX_CONF_ERROR;
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181 }
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182
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183 if (part[i].percent) {
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184 part[i].percent = (uint32_t)
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185 (last + 0xffffffff / 10000 * part[i].percent);
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186 } else {
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187 part[i].percent = 0xffffffff;
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188 }
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189
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190 last = part[i].percent;
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191 }
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192
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193 return rv;
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194 }
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195
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196
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197 static char *
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198 ngx_http_split_clients(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
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199 {
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200 ngx_int_t n;
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201 ngx_str_t *value;
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202 ngx_http_split_clients_ctx_t *ctx;
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203 ngx_http_split_clients_part_t *part;
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204
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205 ctx = cf->ctx;
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206 value = cf->args->elts;
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207
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208 part = ngx_array_push(&ctx->parts);
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209 if (part == NULL) {
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210 return NGX_CONF_ERROR;
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211 }
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212
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213 if (value[0].len == 1 && value[0].data[0] == '*') {
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214 part->percent = 0;
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215
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216 } else {
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217 if (value[0].data[value[0].len - 1] != '%') {
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218 goto invalid;
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219 }
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220
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221 n = ngx_atofp(value[0].data, value[0].len - 1, 2);
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222 if (n == NGX_ERROR || n == 0) {
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223 goto invalid;
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224 }
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225
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226 part->percent = (uint32_t) n;
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227 }
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228
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229 part->value.len = value[1].len;
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230 part->value.valid = 1;
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231 part->value.no_cacheable = 0;
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232 part->value.not_found = 0;
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233 part->value.data = value[1].data;
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234
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235 return NGX_CONF_OK;
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236
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237 invalid:
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238
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239 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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240 "invalid percent value \"%V\"", &value[0]);
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241 return NGX_CONF_ERROR;
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242 }
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