Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_js_module.xml @ 2533:617bc29bd759
Removed phrase "This module is not built by default" from js modules.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 22 Apr 2020 16:54:18 +0100 |
parents | 407c5bd5bffc |
children | 33468af2eaf7 |
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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="Module ngx_stream_js_module" |
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10 link="/en/docs/stream/ngx_stream_js_module.html" |
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11 lang="en" |
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12 rev="19"> |
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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 The <literal>ngx_stream_js_module</literal> module is used to implement |
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18 handlers in <link doc="../njs/index.xml">njs</link> — |
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19 a subset of the JavaScript language. |
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20 </para> |
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21 |
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22 <para> |
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23 Download and install instructions are available |
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24 <link doc="../njs/install.xml">here</link>. |
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25 </para> |
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26 |
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27 </section> |
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28 |
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29 |
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30 <section id="example" name="Example Configuration"> |
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31 |
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32 <para> |
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33 The example works since |
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34 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>. |
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35 <example> |
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36 load_module modules/ngx_stream_js_module.so; |
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37 ... |
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38 |
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39 stream { |
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40 js_import stream.js; |
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41 |
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42 js_set $bar stream.bar; |
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43 js_set $req_line stream.req_line; |
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44 |
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45 server { |
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46 listen 12345; |
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47 |
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48 js_preread stream.preread; |
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49 return $req_line; |
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50 } |
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51 |
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52 server { |
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53 listen 12346; |
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54 |
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55 js_access stream.access; |
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56 proxy_pass 127.0.0.1:8000; |
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57 js_filter stream.header_inject; |
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58 } |
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59 } |
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60 |
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61 http { |
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62 server { |
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63 listen 8000; |
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64 location / { |
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65 return 200 $http_foo\n; |
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66 } |
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67 } |
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68 } |
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69 </example> |
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70 </para> |
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71 |
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72 <para> |
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73 The <path>stream.js</path> file: |
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74 <example> |
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75 var line = ''; |
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76 |
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77 function bar(s) { |
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78 var v = s.variables; |
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79 s.log("hello from bar() handler!"); |
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80 return "bar-var" + v.remote_port + "; pid=" + v.pid; |
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81 } |
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82 |
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83 function preread(s) { |
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84 s.on('upload', function (data, flags) { |
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85 var n = data.indexOf('\n'); |
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86 if (n != -1) { |
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87 line = data.substr(0, n); |
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88 s.done(); |
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89 } |
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90 }); |
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91 } |
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92 |
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93 function req_line(s) { |
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94 return line; |
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95 } |
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96 |
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97 // Read HTTP request line. |
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98 // Collect bytes in 'req' until |
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99 // request line is read. |
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100 // Injects HTTP header into a client's request |
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101 |
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102 var my_header = 'Foo: foo'; |
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103 function header_inject(s) { |
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104 var req = ''; |
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105 s.on('upload', function(data, flags) { |
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106 req += data; |
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107 var n = req.search('\n'); |
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108 if (n != -1) { |
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109 var rest = req.substr(n + 1); |
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110 req = req.substr(0, n + 1); |
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111 s.send(req + my_header + '\r\n' + rest, flags); |
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112 s.off('upload'); |
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113 } |
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114 }); |
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115 } |
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116 |
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117 function access(s) { |
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118 if (s.remoteAddress.match('^192.*')) { |
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119 s.abort(); |
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120 return; |
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121 } |
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122 |
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123 s.allow(); |
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124 } |
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125 |
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126 export default {bar, preread, req_line, access}; |
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127 </example> |
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128 </para> |
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129 |
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130 </section> |
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131 |
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132 |
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133 <section id="directives" name="Directives"> |
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134 |
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135 <directive name="js_access"> |
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136 <syntax><value>function</value> | <value>module.function</value></syntax> |
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137 <default/> |
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138 <context>stream</context> |
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139 <context>server</context> |
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140 |
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141 <para> |
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142 Sets an njs function which will be called at the |
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143 <link doc="stream_processing.xml" id="access_phase">access</link> phase. |
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144 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
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145 a module function can be referenced. |
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146 </para> |
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147 |
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148 </directive> |
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149 |
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150 |
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151 <directive name="js_filter"> |
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152 <syntax><value>function</value> | <value>module.function</value></syntax> |
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153 <default/> |
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154 <context>stream</context> |
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155 <context>server</context> |
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156 |
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157 <para> |
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158 Sets a data filter. |
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159 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
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160 a module function can be referenced. |
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161 </para> |
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162 |
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163 </directive> |
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164 |
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165 |
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166 <directive name="js_import"> |
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167 <syntax><value>module.js</value> | |
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168 <value>export_name from module.js</value></syntax> |
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169 <default/> |
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170 <context>stream</context> |
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171 <appeared-in>0.4.0</appeared-in> |
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172 |
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173 <para> |
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174 Imports a module that implements location and variable handlers in njs. |
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175 The <literal>export_name</literal> is used as a namespace |
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176 to access module functions. |
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177 If the <literal>export_name</literal> is not specified, |
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178 the module name will be used as a namespace. |
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179 <example> |
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180 js_import stream.js; |
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181 </example> |
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182 Here, the module name <literal>stream</literal> is used as a namespace |
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183 while accessing exports. |
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184 If the imported module contains <literal>foo()</literal>, |
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185 <literal>stream.foo</literal> is used to refer to it. |
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186 </para> |
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187 |
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188 <para> |
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189 Several <literal>js_import</literal> directives can be specified. |
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190 </para> |
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191 |
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192 </directive> |
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193 |
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194 |
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195 <directive name="js_include"> |
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196 <syntax><value>file</value></syntax> |
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197 <default/> |
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198 <context>stream</context> |
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199 |
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200 <para> |
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201 Specifies a file that implements server and variable handlers in njs: |
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202 <example> |
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203 nginx.conf: |
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204 js_include stream.js; |
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205 js_set $js_addr address; |
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206 server { |
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207 listen 127.0.0.1:12345; |
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208 return $js_addr; |
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209 } |
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210 |
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211 stream.js: |
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212 function address(s) { |
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213 return s.remoteAddress; |
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214 } |
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215 </example> |
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216 </para> |
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217 |
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218 <para> |
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219 The directive is deprecated since |
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220 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
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221 the <link id="js_import"/> directive should be used instead. |
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222 </para> |
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223 |
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224 </directive> |
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225 |
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226 |
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227 <directive name="js_path"> |
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228 <syntax> |
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229 <value>path</value></syntax> |
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230 <default/> |
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231 <context>http</context> |
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232 <appeared-in>0.3.0</appeared-in> |
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233 |
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234 <para> |
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235 Sets an additional path for njs modules. |
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236 </para> |
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237 |
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238 </directive> |
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239 |
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240 |
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241 <directive name="js_preread"> |
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242 <syntax><value>function</value> | <value>module.function</value></syntax> |
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243 <default/> |
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244 <context>stream</context> |
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245 <context>server</context> |
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246 |
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247 <para> |
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248 Sets an njs function which will be called at the |
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249 <link doc="stream_processing.xml" id="preread_phase">preread</link> phase. |
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250 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
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251 a module function can be referenced. |
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252 </para> |
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253 |
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254 </directive> |
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255 |
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256 |
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257 <directive name="js_set"> |
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258 <syntax> |
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259 <value>$variable</value> <value>function</value> | |
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260 <value>module.function</value></syntax> |
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261 <default/> |
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262 <context>stream</context> |
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263 |
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264 <para> |
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265 Sets an njs function for the specified variable. |
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266 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>, |
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267 a module function can be referenced. |
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268 </para> |
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269 |
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270 </directive> |
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271 |
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272 </section> |
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273 |
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274 |
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275 <section id="properties" name="Session Object Properties"> |
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276 |
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277 <para> |
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278 Each stream njs handler receives one argument, a stream session |
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279 <link doc="../njs/reference.xml" id="stream">object</link>. |
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280 </para> |
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281 |
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282 </section> |
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283 |
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284 </module> |