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annotate xml/en/docs/stream/ngx_stream_js_module.xml @ 2530:407c5bd5bffc

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Documented the js_import directive and corresponding changes. Also the following changes: - js_include is deprecated - js_access, js_content, js_filter, js_preread, js_set can now accept module.function - Example Configuration changed for both http and stream js modules.
author Yaroslav Zhuravlev <yar@nginx.com>
date Wed, 22 Apr 2020 16:54:11 +0100
parents 1101e24c6d14
children 617bc29bd759
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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="18">
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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 This module is not built by default.
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24 Download and install instructions are available
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25 <link doc="../njs/install.xml">here</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="Example Configuration">
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32
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33 <para>
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34 The example works since
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35 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>.
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36 <example>
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37 load_module modules/ngx_stream_js_module.so;
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38 ...
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39
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40 stream {
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41 js_import stream.js;
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42
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43 js_set $bar stream.bar;
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44 js_set $req_line stream.req_line;
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45
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46 server {
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47 listen 12345;
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48
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49 js_preread stream.preread;
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50 return $req_line;
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51 }
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52
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53 server {
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54 listen 12346;
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55
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56 js_access stream.access;
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57 proxy_pass 127.0.0.1:8000;
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58 js_filter stream.header_inject;
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59 }
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60 }
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61
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62 http {
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63 server {
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64 listen 8000;
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65 location / {
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66 return 200 $http_foo\n;
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67 }
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68 }
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69 }
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70 </example>
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71 </para>
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72
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73 <para>
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74 The <path>stream.js</path> file:
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75 <example>
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76 var line = '';
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77
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78 function bar(s) {
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79 var v = s.variables;
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80 s.log("hello from bar() handler!");
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81 return "bar-var" + v.remote_port + "; pid=" + v.pid;
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82 }
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83
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84 function preread(s) {
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85 s.on('upload', function (data, flags) {
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86 var n = data.indexOf('\n');
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87 if (n != -1) {
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88 line = data.substr(0, n);
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89 s.done();
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90 }
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91 });
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92 }
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93
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94 function req_line(s) {
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95 return line;
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96 }
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97
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98 // Read HTTP request line.
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99 // Collect bytes in 'req' until
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100 // request line is read.
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101 // Injects HTTP header into a client's request
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102
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103 var my_header = 'Foo: foo';
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104 function header_inject(s) {
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105 var req = '';
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106 s.on('upload', function(data, flags) {
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107 req += data;
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108 var n = req.search('\n');
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109 if (n != -1) {
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110 var rest = req.substr(n + 1);
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111 req = req.substr(0, n + 1);
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112 s.send(req + my_header + '\r\n' + rest, flags);
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113 s.off('upload');
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114 }
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115 });
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116 }
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117
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118 function access(s) {
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119 if (s.remoteAddress.match('^192.*')) {
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120 s.abort();
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121 return;
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122 }
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123
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124 s.allow();
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125 }
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126
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127 export default {bar, preread, req_line, access};
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128 </example>
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129 </para>
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130
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131 </section>
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132
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133
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134 <section id="directives" name="Directives">
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135
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136 <directive name="js_access">
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137 <syntax><value>function</value> | <value>module.function</value></syntax>
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138 <default/>
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139 <context>stream</context>
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140 <context>server</context>
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141
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142 <para>
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143 Sets an njs function which will be called at the
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144 <link doc="stream_processing.xml" id="access_phase">access</link> phase.
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145 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>,
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146 a module function can be referenced.
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147 </para>
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148
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149 </directive>
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150
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151
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152 <directive name="js_filter">
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153 <syntax><value>function</value> | <value>module.function</value></syntax>
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154 <default/>
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155 <context>stream</context>
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156 <context>server</context>
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157
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158 <para>
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159 Sets a data filter.
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160 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>,
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161 a module function can be referenced.
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162 </para>
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163
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164 </directive>
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165
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166
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167 <directive name="js_import">
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168 <syntax><value>module.js</value> |
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169 <value>export_name from module.js</value></syntax>
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170 <default/>
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171 <context>stream</context>
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172 <appeared-in>0.4.0</appeared-in>
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173
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174 <para>
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175 Imports a module that implements location and variable handlers in njs.
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176 The <literal>export_name</literal> is used as a namespace
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177 to access module functions.
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178 If the <literal>export_name</literal> is not specified,
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179 the module name will be used as a namespace.
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180 <example>
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181 js_import stream.js;
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182 </example>
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183 Here, the module name <literal>stream</literal> is used as a namespace
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184 while accessing exports.
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185 If the imported module contains <literal>foo()</literal>,
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186 <literal>stream.foo</literal> is used to refer to it.
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187 </para>
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188
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189 <para>
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190 Several <literal>js_import</literal> directives can be specified.
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191 </para>
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192
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193 </directive>
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194
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195
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196 <directive name="js_include">
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197 <syntax><value>file</value></syntax>
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198 <default/>
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199 <context>stream</context>
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200
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201 <para>
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202 Specifies a file that implements server and variable handlers in njs:
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203 <example>
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204 nginx.conf:
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205 js_include stream.js;
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206 js_set $js_addr address;
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207 server {
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208 listen 127.0.0.1:12345;
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209 return $js_addr;
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210 }
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211
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212 stream.js:
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213 function address(s) {
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214 return s.remoteAddress;
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215 }
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216 </example>
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217 </para>
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218
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219 <para>
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220 The directive is deprecated since
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221 <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>,
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222 the <link id="js_import"/> directive should be used instead.
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223 </para>
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224
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225 </directive>
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226
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227
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228 <directive name="js_path">
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229 <syntax>
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230 <value>path</value></syntax>
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231 <default/>
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232 <context>http</context>
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233 <appeared-in>0.3.0</appeared-in>
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234
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235 <para>
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236 Sets an additional path for njs modules.
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237 </para>
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238
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239 </directive>
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240
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241
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242 <directive name="js_preread">
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243 <syntax><value>function</value> | <value>module.function</value></syntax>
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244 <default/>
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245 <context>stream</context>
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246 <context>server</context>
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247
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248 <para>
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249 Sets an njs function which will be called at the
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250 <link doc="stream_processing.xml" id="preread_phase">preread</link> phase.
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251 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>,
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252 a module function can be referenced.
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253 </para>
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254
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255 </directive>
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256
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257
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258 <directive name="js_set">
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259 <syntax>
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260 <value>$variable</value> <value>function</value> |
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261 <value>module.function</value></syntax>
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262 <default/>
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263 <context>stream</context>
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264
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265 <para>
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266 Sets an njs function for the specified variable.
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267 Since <link doc="../njs/changes.xml" id="njs0.4.0">0.4.0</link>,
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268 a module function can be referenced.
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269 </para>
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270
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271 </directive>
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272
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273 </section>
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274
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275
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276 <section id="properties" name="Session Object Properties">
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277
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278 <para>
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279 Each stream njs handler receives one argument, a stream session
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280 <link doc="../njs/reference.xml" id="stream">object</link>.
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281 </para>
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283 </section>
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284
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285 </module>