Developing realtime apps with Drupal and NodeJS
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Based on Google's V8 JavaScript engine, NodeJS is a fairly new platform for creating scalable and real-time web applications. I will introduce you to NodeJS internals and ecosystem as well as exaplain why and how you can use Node in your Drupal based projects.
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Developing realtime apps with Drupal and NodeJS
- 2. About myself Ivo Nellis CTO, Fenomen Veebiagentuur ● Working with Drupal since 2007 ● Contributed mostly to Estonian translations ● Main focus: Drupal, Node.js, MongoDB Skype: ivonellis Twitter: ivonellis ivo@fenomen.ee
- 3. Developing realtime apps with Node.js and Drupal Ivo Nellis Fenomen veebiagentuur
- 4. With Node.js, you can write web applications Perfect for fast, scalable, light-weight data- intensive and real-time web applications
- 5. Node.js project is new Relatively...
- 6. 1990 2000 2010 Node.js Ruby on Rails ASP.NET Java PHP Python Perl Created 2009 by Ryan Dahl
- 7. With node, you can write in JavaScript or in something that compiles to JS (CoffeeScript, ...)
- 8. Server-side JavaScript is great! ● JavaScript is the core of modern Web ○ A lot of existing JS developers ○ Familiarity with asynchronous programming model ● Share code between client and server ○ Can use existing libraries on server side as well. ● It's fast ... and it's getting faster every day ○ Huge competition between browser vendors
- 9. But SSJS has been done before.. Jaxer Rhino Ringo Ejscript Spludo LiveWire
- 10. Node.js is built on Google V8 JS engine Fast, Single runtime = less compability issues
- 11. Node.js is asynchronous & event driven and it's great for real-time apps
- 12. Apache request lifecycle Incoming requests Child processes / threads
- 13. The cost of I/O L1-cache 3 cycles L2-cache 14 cycles RAM 250 cycles Disk 41 000 000 cycles Network 240 000 000 cycles http://blog.mixu.net/2011/02/01/understanding-the-node-js-event-loop/ http://duartes.org/gustavo/blog/post/what-your-computer-does-while-you-wait
- 14. Node.js event loop Incoming requests I/O callback I/O request Single process
- 15. Hello World! var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': text/plain'}); res.end('Hello Worldn'); }).listen(8000); ● Node itself does not provide much ● No "standard" webserver features: ● No authentication ● No session handling ● No cookies ● No email ● No templating system ● No MVC or framework layer
- 16. You need to extend ● Active community ● Node package manager (npm) is great ● 10913 packages as of 06/2012 ● Simple one-line installation ● Manages all the dependencies for you $ npm install express var express = require("express");
- 17. express mongodb-native connect socket.io redis request nodemailer jquery underscore calipso async https://github.com/joyent/node/wiki/Modules search.npmjs.org github.com
- 18. Node.js vs Drupal CMS Modules, themes, ... Libraries ... Calipso / etc... Framework Drupal Express.js LIB Connect.js Scripting language PHP Node.js Web Server Apache
- 19. Web sockets and socket.io
- 20. Realtime communication over HTTP is difficult HTTP is request - response by nature No good solutions (ajax, long polling)
- 21. Solution: Web sockets ● Websocket API is a part of HTML5 spec ● New protocol: ws:// & wss:// ● Persistant connection ● Both parties can send data at any time ● Native support in Chrome, Firefox, IE10 ● With node.js and socket.io you can use Web Sockets today http://socket.io/
- 22. Socket.io client & server <script src="/socket.io/socket.io.js"></script> <script> var socket = io.connect('http://localhost'); socket.on('news', function (data) { console.log(data); }); </script> ------------------------------------------------ - var io = require('socket.io').listen(80); io.sockets.on('connection', function (socket) { socket.emit('news', { hello: 'world' }); });
- 23. Combining Drupal, Node. js and Web sockets When and how?
- 24. When should I consider it? ● Doing it all on Apache & Drupal becomes too expensive and unscalable ○ Chat, messaging ○ Liveblog ○ Streaming data (logs, etc...) ○ API layer for a mobile app ○ Realtime widgets (sports, stocks) ○ Games ○ etc...
- 25. How? ● A: Write your own Node server ○ Write your own module code for Drupal ○ Write your own client code ● B: Build on the existing Drupal nodejs module ○ provides node.js server with socket.io support ○ provides a drupal module that integrates with it ○ focuses mainly on realtime updates http://drupal.org/project/nodejs
- 26. nodejs module for Drupal
- 27. Enables realtime communication Provides a module Drupal Client Clients Node.js & socket.io Provides a server script
- 29. Update Watchdog page realtime
- 30. Your custom module $message = (object) array( 'broadcast' => TRUE, 'data' => (object) array( 'subject' => 'Hi!', 'body' => 'An important message!', ), 'channel' => 'my_channel', ); nodejs_enqueue_message($message);
- 31. And the client side implementation Drupal.nodejs.callbacks.example = { callback: function(message) { if (message.channel == "my_channel") { alert(message.data); } } }
- 32. Thank you!