To celebrate my move to the Agile Consulting and Training division of Xebia I thought it would be very appropriate to start playing with some hip new technologies. From their homepages: Node.js: Evented I/O for V8 JavaScript. (A framework for building completely non-blocking servers in Javascript) NPM: A package manager for node. CoffeeScript: A little language that compiles into JavaScript Express: High performance, high class web development for Node.js Jade: Node Template Engine Redis: An open source, advanced key-value store In this guide I will take very small steps so that you can verify that you are check whether you are still on track. The result is an extremely performant, scalable and lightweight alternative for web development.

So I installed a brand new Ubuntu 11.4 virtual machine and got started. After following some tutorials, googling and some tweaking this is the step-by-step guide I came up with. Installing Node.js $ sudo apt-get install python-software-properties $ sudo add-apt-repository ppa:jerome-etienne/neoip $ sudo apt-get update $ sudo apt-get install nodejs Installing npm $ apt-get install curl $ curl https://npmjs.org/install.sh | sudo sh Node.js Hello World $ mkdir helloworld $ cd helloworld $ vi helloworld.js insert [javascript] var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello World\n'); }).listen(1337); console.log('Server running at https://127.0.0.1:1337/'); [/javascript] $ node helloworld.js check https://127.0.0.1:1337 Add Coffeescript Writing all that javascript is going to lead to lots and lots of brackets, semi-colons and parantheses. Let's use Coffeescript to make our code readable again. $ sudo npm install -g coffee-script $ cd .. $ mkdir hellocoffee $ cd hellocoffee $ vi hellocoffee.coffee insert [javascript]http = require "http" http.createServer( (req, res) -> res.writeHead 200, {"Content-Type": "text/plain"} res.end "Hello Coffee!!" ).listen 1337 console.log 'Server running at https://127.0.0.1:1337/' [/javascript] $ coffee -c hellocoffee.coffee $ node hellocoffee.js And check https://127.0.0.1:1337 again. Adding Express Node.js is a very powerful, but it still requires quite a bit of boilerplating to use it for web development. That's where Express comes in. It is build on top of another middleware layer called Connect and gives you much better support in handling requests, rendering, templates and responses. $ cd .. $ sudo npm install -g mime qs connect express $ mkdir helloexpress $ cd helloexpress $ express $ npm install -d $ node app.js check https://127.0.0.1:3000 vi app2.coffee insert: [javascript] express = require('express')app = express.createServer()

Setup configuration

app.use express.static(__dirname + '/public') app.set 'view engine', 'jade'

App Routes

app.get '/', (request, response) -> response.render 'index', { title: 'Express with Coffee' }

Listen

app.listen 3000 console.log "Express server listening on port %d", app.address().port [/javascript] $ coffee -c app2.coffee $ node app2.js And check https://127.0.0.1:3000 again. Now that we have Coffeescript working with Express let's add sessions. Add session support $ vi app2.coffee insert after app.use express.static(__dirname + '/public') [javascript]app.use express.cookieParser() app.use express.session {secret: "Coffeebreak" } [/javascript] insert after app.get '/', (request, response) -> [javascript]request.session.views++[/javascript] replace [javascript]response.render 'index', { title: request.session.views + ': Express with Coffee and sessions' }[/javascript] $ coffee -c app2.coffee $ node app2.js Check https://127.0.0.1:3000 and refresh a few times. You should see the counter increase. Install Redis Open a new terminal. $ wget https://redis.googlecode.com/files/redis-2.2.11.tar.gz $ tar -zxvf redis-2.2.11.tar.gz $ cd redis-2.2.11/ $ sudo apt-get install build-essential $ make $ ./src/redis-server Add redis session to node $ npm install -d redis connect-redis vi app2.coffee insert after express = require 'express' [javascript]RedisStore = require('connect-redis')(express)[/javascript] change [javascript]app.use express.session {secret: "Coffeebreak", store: new RedisStore, cookie: { maxAge: 60000 } }[/javascript] $ coffee -c app2.coffee $ node app2.js In the Redis terminal you should now see something like: [25489] 24 Jun 04:57:11 - DB 0: 1 keys (1 volatile) in 4 slots HT. [25489] 24 Jun 04:57:11 - 1 clients connected (0 slaves), 799032 bytes in use Check https://127.0.0.1:3000 and refresh a bunch of times kill and restart node $ node app2.js Check https://127.0.0.1:3000 again and refresh a few more times Note that you started where you left off. And that brings us to the end of this guide. As you can see the stack is very powerful and extremely small, lightweight and clean. With all the session information in the Redis store the availability of the entire systems comes down to the availability of Redis. And with these guys working on a proper clustering solution it will be very interesting to see where all this is going in the near future.