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A nodejs application

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A walkthrough of how I built a node.js application, showing modules, extracted code and examples.

A walkthrough of how I built a node.js application, showing modules, extracted code and examples.

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  • 1. A NODE.JS APPLICATION Robbie Clutton
  • 2. NOT ANOTHER NODE.JS HELLO WORLD • An application built to run on node.js • Concepts • Modules used for the application • Modules extracted from the application • How dependencies of modules was managed • Design decisions made during development • Hosting
  • 3. NOT ANOTHER NODE.JS HELLO WORLD • An application built to run on node.js • Concepts • Modules used for the application • Modules extracted from the application • How dependencies of modules was managed • Design decisions made during development • Hosting
  • 4. CONCEPTS • CommonJS (http://www.commonjs.org) • Lint (http://www.javascriptlint.com/)
  • 5. NOT ANOTHER NODE.JS HELLO WORLD • An application built to run on node.js • Concepts • Modules used for the application • Modules extracted from the application • How dependencies of modules was managed • Design decisions made during development • Hosting
  • 6. TOOLBOX • nodejs - server side javascript vm (http://nodejs.org/) • connect - middleware (http://github.com/senchalabs/connect) • express - sinatra like routing (http://expressjs.com/) • ndistro - dependencies (http://github.com/visionmedia/ndistro) • ejs - view templates (http://github.com/visionmedia/ejs) • mongoose- mongodb driver(http://github.com/LearnBoost/ mongoose) • log4js - logging (http://github.com/csausdev/log4js-node)
  • 7. CONNECT • Middleware framework • Allowsfilters to be added to HTTP processing (e.g. logging, authentication)
  • 8. CONNECT EXAMPLE var server = Connect.createServer( Connect.logger(), function(req, res) { res.writeHead(200, { 'Content-Type': 'text/plain' }); res.end('Hello World'); } );
  • 9. EXPRESS JS var app = require('express').createServer(); app.get('/', function(req, res){ res.send('hello world'); }); app.listen(3000);
  • 10. EJS res.render('show_username.ejs', { locals:{user:user} }); <% if (user) { %> <h2><%= user.name %></h2> <% } %>
  • 11. MONGOOSE var mongoose = require('../modules/mongoose/mongoose').Mongoose; var db = mongoose.connect('mongodb://localhost/tapas'); mongoose.model('User', { 'properties': ['username', 'password', 'first', 'last', ...], 'indexes': ['first', 'last', [{'username':1},{unique: true}]], 'methods': { save: function(fn){ this.updated_at = new Date(); this.__super__(fn); } } }); module.exports = db.model('User');
  • 12. LOG4JS var log4js = require('log4js'); log4js.addAppender(log4js.fileAppender('log/app.log'), 'controller.client'); var logger = log4js.getLogger('controller.client'); logger.setLevel('DEBUG'); logger.debug(‘hello, world’); [2010-09-28 19:50:24.816] [DEBUG] controller.user - hello, world
  • 13. NOT ANOTHER NODE.JS HELLO WORLD • An application built to run on node.js • Concepts • Modules used for the application • Modules extracted from the application • How dependencies of modules was managed • Design decisions made during development • Hosting
  • 14. EXTRACTED MODULES • node-daemon - a module for start-stop functionality without the need for init.d scripts (http://github.com/theteam/node- daemon) • node-properties - a module for reading JSON property files using override pattern borrowed from Ant (http://github.com/ theteam/node-properties) • tapas-models - a module for common data entities with mongodb wrappers - (http://github.com/theteam/tapas- models)
  • 15. NOT ANOTHER NODE.JS HELLO WORLD • An application built to run on node.js • Concepts • Modules used for the application • Modules extracted from the application • How dependencies of modules was managed • Design decisions made during development • Hosting
  • 16. NDISTRO • Bash script that creates distributions from github for node binaries and modules • Because it’s bash, it can easily be extended • Hash simple syntax • If modules are configured nicely, will symlink modules onto node execution path
  • 17. NDISTRO EXAMPLE node 0.2.0 module senchalabs connect module visionmedia express 1.0.0beta2 module visionmedia ejs ./bin/node ./modules/senchalabs/connect ./modules/visionmedia/express ./modules/visionmedia/ejs ./lib/node/connect ./lib/node/express ./lib/node/ejs
  • 18. NOT ANOTHER NODE.JS HELLO WORLD • An application built to run on node.js • Concepts • Modules used for the application • Modules extracted from the application • How dependencies of modules was managed • Design decisions made during development • Hosting
  • 19. DESIGN DECISIONS • Included everything from: • directory structure • bootstrap and running the application
  • 20. NOT ANOTHER NODE.JS HELLO WORLD • An application built to run on node.js • Concepts • Modules used for the application • Modules extracted from the application • How dependencies of modules was managed • Design decisions made during development • Hosting
  • 21. HOSTING • Joyent (https://no.de/) • Heroku (http://heroku.com/)