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annotate xml/en/docs/http/ngx_http_map_module.xml @ 714:ec33576efaa5

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Added note about minimal impact of declaring multiple variables (geo, map).
author Vladimir Homutov <vl@nginx.com>
date Tue, 09 Oct 2012 12:39:31 +0000
parents 77a3314c74a7
children 81ec181c084e
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_http_map_module"
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11 link="/en/docs/http/ngx_http_map_module.html"
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12 lang="en"
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13 rev="1">
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14
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15 <section id="summary">
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16
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17 <para>
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18 The <literal>ngx_http_map_module</literal> module creates variables
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19 whose values depend on values of other variables.
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20 </para>
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21
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22 </section>
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23
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24
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25 <section id="example" name="Example Configuration">
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26
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27 <para>
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28 <example>
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29 map $http_host $name {
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30 hostnames;
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31
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32 default 0;
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33
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34 example.com 1;
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35 *.example.com 1;
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36 example.org 2;
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37 *.example.org 2;
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38 .example.net 3;
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39 wap.* 4;
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40 }
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41
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42 map $http_user_agent $mobile {
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43 default 0;
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44 "~Opera Mini" 1;
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45 }
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46 </example>
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47 </para>
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48
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49 </section>
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50
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51
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52 <section id="directives" name="Directives">
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53
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54 <directive name="map">
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55 <syntax block="yes">
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56 <value>string</value>
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57 <value>$variable</value></syntax>
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58 <default/>
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59 <context>http</context>
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60
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61 <para>
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62 Creates a new variable whose value
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63 depends on values of one or more of the source variables
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64 specified in the first parameter.
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65 <note>
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66 Before version 0.9.0 only a single variable could be
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67 specified in the first parameter.
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68 </note>
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69 </para>
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70
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71 <para>
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72 <note>
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73 Since variables are evaluated only when used, the mere existence
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74 of even a large number of declared “<literal>map</literal>” variables
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75 does not incur any extra costs for request processing.
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76 </note>
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77 </para>
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78
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79 <para>
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80 Parameters inside the <literal>map</literal> block specify a mapping
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81 between source and resulting values.
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82 </para>
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83
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84 <para>
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85 Source values are specified as strings or regular expressions (0.9.6).
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86 </para>
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87
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88 <para>
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89 A regular expression should either start from the “<literal>~</literal>”
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90 symbol for a case-sensitive matching, or from the “<literal>~*</literal>”
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91 symbols (1.0.4) for case-insensitive matching.
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92 A regular expression can contain named and positional captures
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93 that can later be used in other directives along with the
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94 resulting variable.
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95 </para>
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96
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97 <para>
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98 If a source value matches one of the names of special parameters
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99 described below, it should be prefixed with the “<literal>\</literal>” symbol.
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100 </para>
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101
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102 <para>
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103 The resulting value can be a string
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104 or another variable (0.9.0).
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105 </para>
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106
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107 <para>
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108 The directive also supports three special parameters:
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109 <list type="tag">
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110 <tag-name><literal>default</literal> <value>value</value></tag-name>
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111 <tag-desc>
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112 sets the resulting value if the source value matches none
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113 of the specified variants.
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114 When <literal>default</literal> is not specified, the default
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115 resulting value will be an empty string.
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116 </tag-desc>
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117
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118 <tag-name><literal>hostnames</literal></tag-name>
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119 <tag-desc>
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120 allows to specify hostnames with a prefix or suffix mask, as source
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121 values, for example,
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122 <example>
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123 *.example.com 1;
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124 example.* 1;
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125 </example>
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126 The following two records
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127 <example>
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128 example.com 1;
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129 *.example.com 1;
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130 </example>
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131 can be combined:
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132 <example>
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133 .example.com 1;
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134 </example>
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135 This parameter should be specified before the list of values.
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136 </tag-desc>
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137
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138 <tag-name><literal>include</literal> <value>file</value></tag-name>
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139 <tag-desc>
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140 includes a file with values.
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141 There can be several inclusions.
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142 </tag-desc>
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143
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144 </list>
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145 </para>
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146
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147 <para>
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148 If the source value matches more than one of the specified variants,
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149 e.g. both mask and regular expression match, the first matching
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150 variant will be chosen, in the following order of precedence:
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151 <list type="enum">
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152
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153 <listitem>
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154 string value without a mask
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155 </listitem>
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156
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157 <listitem>
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158 longest string value with a prefix mask,
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159 e.g. “<literal>*.example.com</literal>”
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160 </listitem>
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161
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162 <listitem>
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163 longest string value with a suffix mask,
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164 e.g. “<literal>mail.*</literal>”
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165 </listitem>
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166
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167 <listitem>
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168 first matching regular expression
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169 (in order of appearance in a configuration file)
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170 </listitem>
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171
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172 <listitem>
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173 default value
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174 </listitem>
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175
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176 </list>
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177 </para>
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178
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179 </directive>
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180
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181
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182 <directive name="map_hash_bucket_size">
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183 <syntax><value>size</value></syntax>
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184 <default>32|64|128</default>
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185 <context>http</context>
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186
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187 <para>
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188 Sets the bucket size for the <link id="map"/> variables hash tables.
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189 Default value depends on the size of the processor’s cache line.
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190 Details of setting up hash tables are provided in a separate
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191 <link doc="../hash.xml">document</link>.
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192 </para>
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193
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194 </directive>
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195
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196
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197 <directive name="map_hash_max_size">
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198 <syntax><value>size</value></syntax>
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199 <default>2048</default>
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200 <context>http</context>
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201
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202 <para>
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203 Sets the maximum <value>size</value> of the <link id="map"/> variables
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204 hash tables.
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205 Details of setting up hash tables are provided in a separate
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206 <link doc="../hash.xml">document</link>.
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207 </para>
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208
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209 </directive>
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210
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211 </section>
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212
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213 </module>