Mercurial > hg > nginx-site
annotate xml/ru/docs/stream/ngx_stream_map_module.xml @ 1968:69908bd68481
The HTTP subrequests section of the development guide.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Wed, 19 Apr 2017 18:35:57 +0300 |
parents | c6b5826b64f7 |
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rev | line source |
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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="Модуль ngx_stream_map_module" |
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11 link="/ru/docs/stream/ngx_stream_map_module.html" |
589 | 12 lang="ru" |
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13 rev="2"> |
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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 Модуль <literal>ngx_stream_map_module</literal> (1.11.2) создаёт переменные, |
346 | 19 значения которых зависят от значений других переменных. |
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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 |
346 | 25 <section id="example" name="Пример конфигурации"> |
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26 |
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27 <para> |
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28 <example> |
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29 map $remote_addr $limit { |
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30 127.0.0.1 ""; |
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31 default $binary_remote_addr; |
346 | 32 } |
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33 |
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34 limit_conn_zone $limit zone=addr:10m; |
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35 limit_conn addr 1; |
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36 </example> |
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37 </para> |
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38 |
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39 </section> |
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40 |
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41 |
346 | 42 <section id="directives" name="Директивы"> |
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43 |
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44 <directive name="map"> |
346 | 45 <syntax block="yes"> |
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46 <value>строка</value> |
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47 <value>$переменная</value></syntax> |
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48 <default/> |
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49 <context>stream</context> |
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50 |
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51 <para> |
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52 Создаёт новую переменную, значение которой |
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53 зависит от значений одной или более исходных переменных, |
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54 указанных в первом параметре. |
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55 </para> |
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56 |
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57 <para> |
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58 <note> |
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59 Поскольку переменные вычисляются только в момент использования, |
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60 само по себе наличие даже большого числа объявлений переменных |
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61 “<literal>map</literal>” не влечёт за собой никаких дополнительных |
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62 расходов на обработку соединений. |
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63 </note> |
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64 </para> |
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65 |
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66 <para> |
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67 Параметры внутри блока <literal>map</literal> задают соответствие |
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68 между исходными и результирующими значениями. |
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69 </para> |
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70 |
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71 <para> |
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72 Исходные значения задаются строками или регулярными выражениями. |
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73 </para> |
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74 |
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75 <para> |
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76 Строки проверяются без учёта регистра. |
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77 </para> |
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78 |
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79 <para> |
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80 Перед регулярным выражением ставится символ “<literal>~</literal>”, |
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81 если при сравнении следует учитывать регистр символов, либо символы |
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82 “<literal>~*</literal>”, если регистр символов учитывать не нужно. |
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83 Регулярное выражение может содержать именованные и позиционные выделения, |
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84 которые могут затем использоваться в других директивах совместно с |
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85 результирующей переменной. |
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86 </para> |
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87 |
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88 <para> |
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89 Если исходное значение совпадает с именем одного из специальных параметров, |
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90 описанных ниже, перед ним следует поставить символ “<literal>\</literal>”. |
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91 </para> |
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92 |
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93 <para> |
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94 В качестве результирующего значения можно указать текст, |
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95 переменную и их комбинации. |
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96 </para> |
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97 |
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98 <para> |
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99 Также поддерживаются следующие специальные параметры: |
346 | 100 <list type="tag"> |
101 <tag-name><literal>default</literal> <value>значение</value></tag-name> | |
102 <tag-desc> | |
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103 задаёт результирующее значение, если исходное значение не |
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104 совпадает ни с одним из перечисленных. |
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105 Если параметр <literal>default</literal> не указан, результирующим значением |
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106 по умолчанию будет пустая строка. |
346 | 107 </tag-desc> |
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108 |
346 | 109 <tag-name><literal>hostnames</literal></tag-name> |
110 <tag-desc> | |
111 указывает, что в качестве исходных значений можно | |
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112 использовать маску для первой или последней части имени хоста, например, |
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113 <example> |
346 | 114 *.example.com 1; |
115 example.* 1; | |
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116 </example> |
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117 Вместо двух записей |
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118 <example> |
346 | 119 example.com 1; |
120 *.example.com 1; | |
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121 </example> |
346 | 122 можно использовать одну: |
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123 <example> |
346 | 124 .example.com 1; |
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125 </example> |
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126 Этот параметр следует указывать перед списком значений. |
346 | 127 </tag-desc> |
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128 |
346 | 129 <tag-name><literal>include</literal> <value>файл</value></tag-name> |
130 <tag-desc> | |
131 включает файл со значениями. | |
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132 Включений может быть несколько. |
346 | 133 </tag-desc> |
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134 |
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135 <tag-name id="volatile"><literal>volatile</literal></tag-name> |
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136 <tag-desc> |
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137 указывает, что переменная не кэшируется (1.11.7). |
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138 </tag-desc> |
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139 |
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140 </list> |
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141 </para> |
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142 |
572
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143 <para> |
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144 Если исходному значению соответствует несколько из указанных вариантов, |
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145 например, одновременно подходят и маска, и регулярное выражение, |
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146 будет выбран первый подходящий вариант в следующем порядке приоритета: |
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147 <list type="enum"> |
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148 |
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149 <listitem> |
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150 строковое значение без маски |
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151 </listitem> |
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152 |
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153 <listitem> |
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154 самое длинное строковое значение с маской в начале, |
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155 например “<literal>*.example.com</literal>” |
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156 </listitem> |
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157 |
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158 <listitem> |
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159 самое длинное строковое значение с маской в конце, |
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160 например “<literal>mail.*</literal>” |
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161 </listitem> |
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162 |
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163 <listitem> |
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164 первое подходящее регулярное выражение |
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165 (в порядке следования в конфигурационном файле) |
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166 </listitem> |
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167 |
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168 <listitem> |
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169 значение по умолчанию (<literal>default</literal>) |
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170 </listitem> |
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171 |
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172 </list> |
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173 </para> |
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174 |
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175 </directive> |
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176 |
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177 |
346 | 178 <directive name="map_hash_bucket_size"> |
179 <syntax><value>размер</value></syntax> | |
180 <default>32|64|128</default> | |
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181 <context>stream</context> |
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182 |
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183 <para> |
346 | 184 Задаёт размер корзины в хэш-таблицах для переменных <link id="map"/>. |
185 Значение по умолчанию зависит от размера строки кэша процессора. | |
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186 Подробнее настройка хэш-таблиц обсуждается в отдельном |
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187 <link doc="../hash.xml">документе</link>. |
98 | 188 </para> |
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189 |
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190 </directive> |
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191 |
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192 |
346 | 193 <directive name="map_hash_max_size"> |
194 <syntax><value>размер</value></syntax> | |
195 <default>2048</default> | |
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196 <context>stream</context> |
98 | 197 |
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198 <para> |
346 | 199 Задаёт максимальный размер хэш-таблиц для переменных <link id="map"/>. |
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200 Подробнее настройка хэш-таблиц обсуждается в отдельном |
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201 <link doc="../hash.xml">документе</link>. |
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202 </para> |
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203 |
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204 </directive> |
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205 |
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206 </section> |
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207 |
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208 </module> |