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annotate xml/ru/docs/stream/ngx_stream_js_module.xml @ 2188:523dc4cc8745

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Updated installation procedure in njs modules.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 19 Jun 2018 20:43:33 +0300
parents cd4889fdcfa4
children dfc49994218c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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) Nginx, Inc.
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5 -->
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6
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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8
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9 <module name="Модуль ngx_stream_js_module"
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10 link="/ru/docs/stream/ngx_stream_js_module.html"
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11 lang="ru"
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12 rev="12">
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13
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14 <section id="summary">
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15
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16 <para>
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17 Модуль <literal>ngx_stream_js_module</literal> позволяет задавать
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18 обработчики на <link doc="../njs_about.xml">njs</link> —
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19 подмножестве языка JavaScript.
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20 </para>
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21
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22 <para>
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23 По умолчанию этот модуль не собирается.
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24 Инструкция по сборке и установке доступны
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25 <link doc="../njs_about.xml" id="install">здесь</link>.
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26 </para>
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27
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28 </section>
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29
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30
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31 <section id="example" name="Пример конфигурации">
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32
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33 <para>
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34 <example>
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35 stream {
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36 js_include stream.js;
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37
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38 js_set $foo foo;
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39 js_set $bar bar;
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40
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41 server {
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42 listen 12345;
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43
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44 js_preread qux;
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45 return $foo;
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46 }
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47
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48 server {
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49 listen 12346;
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50
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51 js_access xyz;
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52 proxy_pass 127.0.0.1:8000;
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53 js_filter baz;
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54 }
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55 }
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56
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57 http {
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58 server {
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59 listen 8000;
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60 location / {
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61 return 200 $http_foo\n;
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62 }
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63 }
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64 }
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65 </example>
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66 </para>
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67
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68 <para>
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69 Файл <path>stream.js</path>:
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70 <example>
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71 var req = '';
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72 var matched = 0;
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73 var line = '';
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74
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75 function qux(s) {
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76 var n = s.buffer.indexOf('\n');
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77 if (n == -1) {
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78 return s.AGAIN;
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79 }
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80
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81 line = s.buffer.substr(0, n);
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82 }
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83
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84 function foo(s) {
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85 return line;
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86 }
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87
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88 function bar(s) {
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89 var v = s.variables;
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90 s.log("hello from bar() handler!");
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91 return "foo-var" + v.remote_port + "; pid=" + v.pid;
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92 }
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93
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94 // Фильтр обрабатывает один буфер за вызов.
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95 // Буфер недоступен в s.buffer для
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96 // чтения и записи. Вызывается в обоих направлениях.
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97
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98 function baz(s) {
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99 if (s.fromUpstream || matched) {
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100 return;
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101 }
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102
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103 // Отключение определённых адресов.
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104
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105 if (s.remoteAddress.match('^192.*')) {
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106 return s.ERROR;
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107 }
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108
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109 // Чтение строки HTTP-запроса.
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110 // Получение байт в 'req' до того как
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111 // будет прочитана строка запроса. Очистка текущего буфера
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112 // для отключения вывода.
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113
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114 req = req + s.buffer;
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115 s.buffer = '';
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116
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117 var n = req.search('\n');
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118
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119 if (n != -1) {
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120 // Вставка нового HTTP-заголовка.
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121 var rest = req.substr(n + 1);
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122 req = req.substr(0, n + 1);
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123
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124 var addr = s.remoteAddress;
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125
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126 s.log('req:' + req);
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127 s.log('rest:' + rest);
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128
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129 // Вывод результата и пропуск дальнейшей
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130 // обработки.
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131
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132 s.buffer = req + 'Foo: addr_' + addr + '\r\n' + rest;
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133 matched = 1;
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134 }
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135 }
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136
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137 function xyz(s) {
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138 if (s.remoteAddress.match('^192.*')) {
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139 return s.ABORT;
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140 }
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141 }
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142 </example>
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143 </para>
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144
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145 </section>
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146
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147
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148 <section id="directives" name="Директивы">
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149
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150 <directive name="js_access">
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151 <syntax><value>функция</value></syntax>
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152 <default/>
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153 <context>stream</context>
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154 <context>server</context>
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155
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156 <para>
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157 Задаёт функцию njs, которая будет вызываться в
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158 <link doc="stream_processing.xml" id="access_phase">access</link>-фазе.
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159 </para>
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160
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161 </directive>
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162
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163
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164 <directive name="js_filter">
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165 <syntax><value>функция</value></syntax>
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166 <default/>
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167 <context>stream</context>
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168 <context>server</context>
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169
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170 <para>
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171 Задаёт фильтр данных.
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172 </para>
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173
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174 </directive>
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175
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176
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177 <directive name="js_include">
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178 <syntax><value>файл</value></syntax>
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179 <default/>
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180 <context>stream</context>
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181
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182 <para>
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183 Задаёт файл, который позволяет
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184 задавать обработчики server и переменных на njs.
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185 </para>
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186
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187 </directive>
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188
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189
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190 <directive name="js_preread">
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191 <syntax><value>функция</value></syntax>
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192 <default/>
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193 <context>stream</context>
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194 <context>server</context>
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195
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196 <para>
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197 Задаёт функцию njs, которая будет вызываться в
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198 <link doc="stream_processing.xml" id="preread_phase">preread</link>-фазе.
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199 </para>
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200
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201 </directive>
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202
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203
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204 <directive name="js_set">
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205 <syntax>
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206 <value>$переменная</value> <value>функция</value></syntax>
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207 <default/>
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208 <context>stream</context>
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209
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210 <para>
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211 Задаёт функцию njs для указанной переменной.
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212 </para>
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213
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214 </directive>
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215
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216 </section>
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217
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218
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219 <section id="properties" name="Свойства объекта сессии">
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220
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221 <para>
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222 Каждый stream-обработчик njs получает один аргумент,
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223 <link doc="../njs/njs_api.xml" id="stream_session">объект</link> stream-сессии.
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224 </para>
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225
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226 </section>
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227
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228 </module>