nginx-site: xml/en/docs/njs/node

annotate xml/en/docs/njs/node_modules.xml @ 2576:4c8d0b37932d

Corrected syntax and style of "Using node modules with njs".

author	Yaroslav Zhuravlev <yar@nginx.com>
date	Thu, 06 Aug 2020 14:46:58 +0100
parents	bda080989b6c
children	fca42223b9fc

rev	line source
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	1 <?xml version="1.0"?>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	2
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	3 <!--
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	4 Copyright (C) Nginx, Inc.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	5 -->
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	6
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	7 <!DOCTYPE article SYSTEM "../../../../dtd/article.dtd">
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	8
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	9 <article name="Using node modules with njs"
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	10 link="/en/docs/njs/node_modules.html"
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	11 lang="en"
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	12 rev="4">
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	13
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	14 <section id="intro">
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	15
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	16 <para>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	17 Often, a developer wants to use 3rd-party code,
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	18 usually available as a library of some kind.
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	19 In the JavaScript world, the concept of a module is relatively new,
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	20 so there was no standard until recently.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	21 Many platforms (browsers) still don't support modules, which makes code
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	22 reuse harder.
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	23 This article describes ways to reuse
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	24 <link url="https://nodejs.org/">Node.js</link> code in njs.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	25 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	26
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	27 <note>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	28 Examples in this article use features that appeared in
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	29 <link doc="index.xml">njs</link>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	30 <link doc="changes.xml" id="njs0.3.8">0.3.8</link>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	31 </note>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	32
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	33 <para>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	34 There is a number of issues
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	35 that may arise when 3rd-party code is added to njs:
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	36
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	37 <list type="bullet">
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	38
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	39 <listitem>
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	40 Multiple files that reference each other and their dependencies
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	41 </listitem>
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	42
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	43 <listitem>
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	44 Platform-specific APIs
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	45 </listitem>
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	46
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	47 <listitem>
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	48 Modern standard language constructions
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	49 </listitem>
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	50
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	51 </list>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	52 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	53
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	54 <para>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	55 The good news is that such problems are not something new or specific to njs.
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	56 JavaScript developers face them daily
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	57 when trying to support multiple disparate platforms
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	58 with very different properties.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	59 There are instruments designed to resolve the above-mentioned issues.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	60
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	61 <list type="bullet">
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	62
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	63 <listitem>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	64 Multiple files that reference each other, and their dependencies
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	65 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	66 This can be solved by merging all the interdependent code into a single file.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	67 Tools like
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	68 <link url="http://browserify.org/">browserify</link> or
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	69 <link url="https://webpack.js.org/">webpack</link>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	70 accept an entire project and produce a single file containing
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	71 your code and all the dependencies.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	72 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	73 </listitem>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	74
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	75 <listitem>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	76 Platform-specific APIs
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	77 <para>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	78 You can use multiple libraries that implement such APIs
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	79 in a platform-agnostic manner (at the expense of performance, though).
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	80 Particular features can also be implemented using the
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	81 <link url="https://polyfill.io/v3/">polyfill</link> approach.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	82 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	83 </listitem>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	84
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	85 <listitem>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	86 Modern standard language constructions
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	87 <para>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	88 Such code can be transpiled:
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	89 this means performing a number of transformations
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	90 that rewrite newer language features in accordance with an older standard.
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	91 For example, <link url="https://babeljs.io/"> babel</link> project
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	92 can be used to this purpose.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	93 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	94 </listitem>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	95
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	96 </list>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	97 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	98
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	99 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	100 In this guide, we will use two relatively large npm-hosted libraries:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	101
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	102 <list type="bullet">
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	103
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	104 <listitem>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	105 <link url="https://www.npmjs.com/package/protobufjs">protobufjs</link>—
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	106 a library for creating and parsing protobuf messages used by the
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	107 <link url="https://grpc.io/">gRPC</link> protocol
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	108 </listitem>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	109
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	110 <listitem>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	111 <link url="https://www.npmjs.com/package/dns-packet">dns-packet</link>—
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	112 a library for processing DNS protocol packets
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	113 </listitem>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	114
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	115 </list>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	116 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	117
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	118 </section>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	119
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	120
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	121 <section id="environment" name="Environment">
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	122
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	123 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	124 <note>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	125 This document mostly employs a generic approach
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	126 and avoids specific best practice advices concerning Node.js
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	127 and JavaScript.
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	128 Make sure to consult the corresponding package's manual
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	129 before following the steps suggested here.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	130 </note>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	131 First (assuming Node.js is installed and operational), let's create an
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	132 empty project and install some dependencies;
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	133 the commands below assume we are in the working directory:
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	134 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	135 $ mkdir my_project && cd my_project
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	136 $ npx license choose_your_license_here > LICENSE
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	137 $ npx gitignore node
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	138
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	139 $ cat > package.json <<EOF
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	140 {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	141 "name": "foobar",
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	142 "version": "0.0.1",
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	143 "description": "",
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	144 "main": "index.js",
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	145 "keywords": [],
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	146 "author": "somename <some.email@example.com> (https://example.com)",
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	147 "license": "some_license_here",
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	148 "private": true,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	149 "scripts": {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	150 "test": "echo \"Error: no test specified\" && exit 1"
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	151 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	152 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	153 EOF
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	154 $ npm init -y
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	155 $ npm install browserify
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	156 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	157 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	158
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	159 </section>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	160
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	161
2481 8ed243471444 Typos fixed. Vladimir Homutov <vl@nginx.com> parents: 2480 diff changeset	162 <section id="protobuf" name="Protobufjs">
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	163
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	164 <para>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	165 The library provides a parser
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	166 for the <literal>.proto</literal> interface definitions
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	167 and a code generator for message parsing and generation.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	168 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	169
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	170 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	171 In this example, we will use the
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	172 <link url="https://github.com/grpc/grpc/blob/master/examples/protos/helloworld.proto">helloworld.proto</link>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	173 file
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	174 from the gRPC examples.
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	175 Our goal is to create two messages:
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	176 <literal>HelloRequest</literal> and
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	177 <literal>HelloResponse</literal>.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	178 We will use the
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	179 <link url="https://github.com/protobufjs/protobuf.js/blob/master/README.md#reflection-vs-static-code">static</link>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	180 mode of protobufjs instead of dynamically generating classes, because
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	181 njs doesn't support adding new functions dynamically
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	182 due to security considerations.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	183 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	184
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	185 <para>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	186 Next, the library is installed and
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	187 the JavaScript code implementing message marshalling
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	188 is generated from the protocol definition:
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	189 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	190 $ npm install protobufjs
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	191 $ npx pbjs -t static-module helloworld.proto > static.js
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	192 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	193 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	194
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	195 <para>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	196 Thus, the <literal>static.js</literal> file becomes our new dependency,
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	197 storing all the code we need to implement message processing.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	198 The <literal>set_buffer()</literal> function contains code that uses the
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	199 library to create a buffer with the serialized
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	200 <literal>HelloRequest</literal> message.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	201 The code resides in the <literal>code.js</literal> file:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	202 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	203 var pb = require('./static.js');
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	204
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	205 // Example usage of protobuf library: prepare a buffer to send
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	206 function set_buffer(pb)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	207 {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	208 // set fields of gRPC payload
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	209 var payload = { name: "TestString" };
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	210
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	211 // create an object
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	212 var message = pb.helloworld.HelloRequest.create(payload);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	213
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	214 // serialize object to buffer
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	215 var buffer = pb.helloworld.HelloRequest.encode(message).finish();
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	216
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	217 var n = buffer.length;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	218
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	219 var frame = new Uint8Array(5 + buffer.length);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	220
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	221 frame[0] = 0; // 'compressed' flag
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	222 frame[1] = (n & 0xFF000000) >>> 24; // length: uint32 in network byte order
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	223 frame[2] = (n & 0x00FF0000) >>> 16;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	224 frame[3] = (n & 0x0000FF00) >>> 8;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	225 frame[4] = (n & 0x000000FF) >>> 0;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	226
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	227 frame.set(buffer, 5);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	228
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	229 return frame;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	230 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	231
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	232 var frame = set_buffer(pb);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	233 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	234 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	235
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	236 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	237 To ensure it works, we execute the code using node:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	238 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	239 $ node ./code.js
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	240 Uint8Array [
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	241 0, 0, 0, 0, 12, 10,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	242 10, 84, 101, 115, 116, 83,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	243 116, 114, 105, 110, 103
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	244 ]
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	245 </example>
2481 8ed243471444 Typos fixed. Vladimir Homutov <vl@nginx.com> parents: 2480 diff changeset	246 You can see that this got us a properly encoded <literal>gRPC</literal> frame.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	247 Now let's run it with njs:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	248 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	249 $ njs ./code.js
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	250 Thrown:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	251 Error: Cannot find module "./static.js"
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	252 at require (native)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	253 at main (native)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	254 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	255 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	256
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	257 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	258 Modules are not supported, so we've received an exception.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	259 To overcome this issue, let's use <literal>browserify</literal>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	260 or other similar tool.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	261 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	262
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	263 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	264 An attempt to process our existing <literal>code.js</literal> file will result
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	265 in a bunch of JS code that is supposed to run in a browser,
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	266 i.e. immediately upon loading.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	267 This isn't something we actually want.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	268 Instead, we want to have an exported function that
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	269 can be referenced from the nginx configuration.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	270 This requires some wrapper code.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	271 <note>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	272 In this guide, we use
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	273 njs <link doc="cli.xml">cli</link> in all examples for the sake of simplicity.
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	274 In real life, you will be using nginx njs module to run your code.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	275 </note>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	276 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	277
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	278 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	279 The <literal>load.js</literal> file contains the library-loading code that
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	280 stores its handle in the global namespace:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	281 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	282 global.hello = require('./static.js');
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	283 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	284 This code will be replaced with merged content.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	285 Our code will be using the "<literal>global.hello</literal>" handle to access
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	286 the library.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	287 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	288
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	289 <para>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	290 Next, we process it with <literal>browserify</literal>
4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	291 to get all dependencies into a single file:
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	292 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	293 $ npx browserify load.js -o bundle.js -d
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	294 </example>
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	295 The result is a huge file that contains all our dependencies:
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	296 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	297 (function(){function......
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	298 ...
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	299 ...
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	300 },{"protobufjs/minimal":9}]},{},[1])
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	301 //# sourceMappingURL..............
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	302 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	303 To get final "<literal>njs_bundle.js</literal>" file we concatenate
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	304 "<literal>bundle.js</literal>" and the following code:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	305 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	306 // Example usage of protobuf library: prepare a buffer to send
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	307 function set_buffer(pb)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	308 {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	309 // set fields of gRPC payload
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	310 var payload = { name: "TestString" };
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	311
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	312 // create an object
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	313 var message = pb.helloworld.HelloRequest.create(payload);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	314
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	315 // serialize object to buffer
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	316 var buffer = pb.helloworld.HelloRequest.encode(message).finish();
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	317
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	318 var n = buffer.length;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	319
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	320 var frame = new Uint8Array(5 + buffer.length);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	321
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	322 frame[0] = 0; // 'compressed' flag
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	323 frame[1] = (n & 0xFF000000) >>> 24; // length: uint32 in network byte order
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	324 frame[2] = (n & 0x00FF0000) >>> 16;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	325 frame[3] = (n & 0x0000FF00) >>> 8;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	326 frame[4] = (n & 0x000000FF) >>> 0;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	327
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	328 frame.set(buffer, 5);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	329
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	330 return frame;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	331 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	332
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	333 // functions to be called from outside
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	334 function setbuf()
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	335 {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	336 return set_buffer(global.hello);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	337 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	338
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	339 // call the code
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	340 var frame = setbuf();
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	341 console.log(frame);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	342 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	343 Let's run the file using node to make sure things still work:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	344 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	345 $ node ./njs_bundle.js
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	346 Uint8Array [
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	347 0, 0, 0, 0, 12, 10,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	348 10, 84, 101, 115, 116, 83,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	349 116, 114, 105, 110, 103
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	350 ]
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	351 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	352 Now let's proceed further with njs:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	353 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	354 $ /njs ./njs_bundle.js
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	355 Uint8Array [0,0,0,0,12,10,10,84,101,115,116,83,116,114,105,110,103]
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	356 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	357 The last thing will be to use njs-specific API to convert
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	358 array into byte string, so it could be usable by nginx module.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	359 We can add the following snippet before the last line:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	360 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	361 if (global.njs) {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	362 return String.bytesFrom(frame)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	363 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	364 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	365 Finally, we got it working:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	366 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	367 $ njs ./njs_bundle.js \|hexdump -C
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	368 00000000 00 00 00 00 0c 0a 0a 54 65 73 74 53 74 72 69 6e \|.......TestStrin\|
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	369 00000010 67 0a \|g.\|
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	370 00000012
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	371 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	372 This is the intended result.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	373 Response parsing can be implemented similarly:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	374 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	375 function parse_msg(pb, msg)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	376 {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	377 // convert byte string into integer array
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	378 var bytes = msg.split('').map(v=>v.charCodeAt(0));
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	379
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	380 if (bytes.length < 5) {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	381 throw 'message too short';
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	382 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	383
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	384 // first 5 bytes is gRPC frame (compression + length)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	385 var head = bytes.splice(0, 5);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	386
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	387 // ensure we have proper message length
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	388 var len = (head[1] << 24)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	389 + (head[2] << 16)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	390 + (head[3] << 8)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	391 + head[4];
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	392
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	393 if (len != bytes.length) {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	394 throw 'header length mismatch';
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	395 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	396
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	397 // invoke protobufjs to decode message
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	398 var response = pb.helloworld.HelloReply.decode(bytes);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	399
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	400 console.log('Reply is:' + response.message);
2489 bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	401 }
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	402 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	403 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	404
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	405 </section>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	406
2576 4c8d0b37932d Corrected syntax and style of "Using node modules with njs". Yaroslav Zhuravlev <yar@nginx.com> parents: 2489 diff changeset	407
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	408 <section id="dnspacket" name="DNS-packet">
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	409
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	410 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	411 This example uses a library for generation and parsing of DNS packets.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	412 This a case worth considering because the library and its dependencies
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	413 use modern language constructions not yet supported by njs.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	414 In turn, this requires from us an extra step: transpiling the source code.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	415 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	416
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	417 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	418 Additional node packages are needed:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	419 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	420 $ npm install @babel/core @babel/cli @babel/preset-env babel-loader
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	421 $ npm install webpack webpack-cli
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	422 $ npm install buffer
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	423 $ npm install dns-packet
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	424 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	425 The configuration file, webpack.config.js:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	426 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	427 const path = require('path');
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	428
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	429 module.exports = {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	430 entry: './load.js',
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	431 mode: 'production',
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	432 output: {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	433 filename: 'wp_out.js',
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	434 path: path.resolve(__dirname, 'dist'),
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	435 },
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	436 optimization: {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	437 minimize: false
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	438 },
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	439 node: {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	440 global: true,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	441 },
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	442 module : {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	443 rules: [{
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	444 test: /\.m?js$$/,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	445 exclude: /(bower_components)/,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	446 use: {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	447 loader: 'babel-loader',
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	448 options: {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	449 presets: ['@babel/preset-env']
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	450 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	451 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	452 }]
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	453 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	454 };
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	455 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	456 Note we are using "<literal>production</literal>" mode.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	457 In this mode webpack does not use "<literal>eval</literal>" construction
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	458 not supported by njs.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	459 The referenced <literal>load.js</literal> file is our entry point:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	460 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	461 global.dns = require('dns-packet')
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	462 global.Buffer = require('buffer/').Buffer
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	463 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	464 We start the same way, by producing a single file for the libraries:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	465 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	466 $ npx browserify load.js -o bundle.js -d
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	467 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	468 Next, we process the file with webpack, which itself invokes babel:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	469 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	470 $ npx webpack --config webpack.config.js
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	471 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	472 This command produces the <literal>dist/wp_out.js</literal> file, which is a
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	473 transpiled version of <literal>bundle.js</literal>.
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	474 We need to concatenate it with <literal>code.js</literal>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	475 that stores our code:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	476 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	477 function set_buffer(dnsPacket)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	478 {
2489 bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	479 // create DNS packet bytes
bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	480 var buf = dnsPacket.encode({
bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	481 type: 'query',
bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	482 id: 1,
bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	483 flags: dnsPacket.RECURSION_DESIRED,
bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	484 questions: [{
bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	485 type: 'A',
bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	486 name: 'google.com'
bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	487 }]
bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	488 })
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	489
2489 bda080989b6c Fixed indentation and braces in njs example. Vladimir Homutov <vl@nginx.com> parents: 2481 diff changeset	490 return buf;
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	491 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	492 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	493 Note that in this example generated code is not wrapped into function and we
2481 8ed243471444 Typos fixed. Vladimir Homutov <vl@nginx.com> parents: 2480 diff changeset	494 do not need to call it explicitly.
8ed243471444 Typos fixed. Vladimir Homutov <vl@nginx.com> parents: 2480 diff changeset	495 The result is in the "<literal>dist</literal>" directory:
2480 73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	496 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	497 $ cat dist/wp_out.js code.js > njs_dns_bundle.js
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	498 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	499 Let's call our code at the end of a file:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	500 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	501 var b = setbuf(1);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	502 console.log(b);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	503 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	504 And execute it using node:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	505 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	506 $ node ./njs_dns_bundle_final.js
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	507 Buffer [Uint8Array] [
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	508 0, 1, 1, 0, 0, 1, 0, 0,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	509 0, 0, 0, 0, 6, 103, 111, 111,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	510 103, 108, 101, 3, 99, 111, 109, 0,
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	511 0, 1, 0, 1
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	512 ]
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	513 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	514 Make sure this works as expected, and then run it with njs:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	515 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	516 $ njs ./njs_dns_bundle_final.js
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	517 Uint8Array [0,1,1,0,0,1,0,0,0,0,0,0,6,103,111,111,103,108,101,3,99,111,109,0,0,1,0,1]
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	518 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	519
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	520 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	521
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	522 <para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	523 The response can be parsed as follows:
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	524 <example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	525 function parse_response(buf)
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	526 {
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	527 var bytes = buf.split('').map(v=>v.charCodeAt(0));
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	528
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	529 var b = global.Buffer.from(bytes);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	530
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	531 var packet = dnsPacket.decode(b);
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	532
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	533 var resolved_name = packet.answers[0].name;
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	534
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	535 // expected name is 'google.com', according to our request above
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	536 }
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	537 </example>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	538 </para>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	539
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	540 </section>
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	541
73d254c3376d Added the "Using node modules with njs" article. Vladimir Homutov <vl@nginx.com> parents: diff changeset	542 </article>

Mercurial > hg > nginx-site

annotate xml/en/docs/njs/node_modules.xml @ 2576:4c8d0b37932d