Node.js and Ruby

& Ruby Saturday, April 17, 2010

@mbleigh Saturday, April 17, 2010

Saturday, April 17, 2010

present.ly Saturday, April 17, 2010

What’s Node? Saturday, April 17, 2010

Evented I/O for Javascript Saturday, April 17, 2010

Taking JS Beyond the Browser Saturday, April 17, 2010

Runs on Google’s V8 Saturday, April 17, 2010

Supported By Node • HTTP, TCP • File I/O • Redis, Mongo, SQL (DBSlayer) Saturday, April 17, 2010

Express: Node’s Sinatra • RESTful DSL for Node webapps • Cookies, sessions, caching, etc. • expressjs.com Saturday, April 17, 2010

require.paths.unshift('path/to/express/lib') require('express') get('/', function(){ this.redirect('/hello/world') }) get('/hello/world', function(){ return 'Hello World' }) run() Saturday, April 17, 2010

Why Node? Saturday, April 17, 2010

Generally Speedy Saturday, April 17, 2010

> summary(node1$ttime) Min. 1st Qu. Median Mean 3rd Qu. Max. 0.0000 0.0000 1.0000 0.7437 1.0000 106.0000 > summary(thin1$ttime) Min. 1st Qu. Median Mean 3rd Qu. Max. 0.000 1.000 1.000 1.122 1.000 74.000 > summary(narwhal1$ttime) Min. 1st Qu. Median Mean 3rd Qu. Max. 15.00 22.00 23.00 23.74 24.00 88.00 > summary(v8cgi1$ttime) Min. 1st Qu. Median Mean 3rd Qu. Max. 12.00 13.00 13.00 14.49 18.00 39.00 four.livejournal.com/1019177.html Saturday, April 17, 2010

Great at Concurrency Saturday, April 17, 2010

Asynchronous Everything Saturday, April 17, 2010

bit.ly/nodejs-fstream function upload_file(req, res) { req.setBodyEncoding('binary'); var stream = new multipart.Stream(req); stream.addListener('part', function(part) { part.addListener('body', function(chunk) { var progress = (stream.bytesReceived / stream.bytesTotal * 100).toFixed(2); var mb = (stream.bytesTotal / 1024 / 1024).toFixed(1); sys.print("Uploading "+mb+"mb ("+progress+"%)015"); // chunk could be appended to a file if the uploaded file needs to be saved }); }); stream.addListener('complete', function() { res.sendHeader(200, {'Content-Type': 'text/plain'}); res.sendBody('Thanks for playing!'); res.finish(); sys.puts("n=> Done"); }); } Saturday, April 17, 2010

Javascript is great for this. Saturday, April 17, 2010

Browser and server, together at last Saturday, April 17, 2010

Why Ruby? Saturday, April 17, 2010

Are you at the right conf? Saturday, April 17, 2010

When to Node Saturday, April 17, 2010

Real-Time Applications Saturday, April 17, 2010

WebSockets • Persistent server connections • Part of HTML5 • True real-time for web apps • Deprecate to Flash Sockets Saturday, April 17, 2010

Why Real-Time? • Better on your server • Better for your user • You need more buzzwords Saturday, April 17, 2010

Why JS for WebSockets? • You already write your client interaction code in Javascript • Just an extension of that • Same interface throughout Saturday, April 17, 2010

Hazards of a Young Tool Saturday, April 17, 2010

node.websocket.js • Framework-like approach • Includes fun examples • Node version headaches • github.com/guille/node.websocket.js/ Saturday, April 17, 2010

Socket.IO • Multi-transport socket for Node • Comes with client JS library • For production usage • github.com/rosepad/socket.io-node Saturday, April 17, 2010

node.ws.js • Minimal Node WebSocket server • Talk to your browser clients • Javascript all the way down • Mostly for experimentation • github.com/ncr/node.ws.js Saturday, April 17, 2010

How can we actually use it? Saturday, April 17, 2010

Redis is the Bridge • Super-fast, super-awesome • PUBSUB = WIN! • Swiss-army knife for your app. Saturday, April 17, 2010

Example • Twitter-esque status streams • Want to update web interface in real time • Rails, Node, Redis, and Chrome Saturday, April 17, 2010

The Ruby Code Saturday, April 17, 2010

class User < ActiveRecord::Base # Include default devise modules. Others available are: # :token_authenticatable, :lockable and :timeoutable devise :database_authenticatable, :registerable, :rememberable, :validatable # Setup accessible (or protected) attributes for your model attr_accessible :email, :password, :password_confirmation def follow(other_user) Red.sadd "user:#{other_user.id}:followers", self.id Red.sadd "user:#{self.id}:follows", other_user.id end def follower_ids Red.smembers "user:#{self.id}:followers" end def follow_ids Red.smembers "user:#{self.id}:follows" end def update(text) (follower_ids + [self.id]).each do |uid| Red.lpush "user:#{uid}:timeline", text Red.lpush "user:#{uid}:updates", text Red.publish "user:#{uid}:timeline", text end end end Saturday, April 17, 2010

def update(text) (follower_ids + [self.id]).each do |uid| Red.lpush "user:#{uid}:timeline", text Red.lpush "user:#{uid}:updates", text Red.publish "user:#{uid}:timeline", text end end Saturday, April 17, 2010

The Node Code Saturday, April 17, 2010

ws.createServer(function (websocket) { var user_id = null; var websocket = websocket; websocket.addListener("connect", function (resource) { user_id = resource.match(/timeline/([0-9]+)$/i)[1] clients[user_id] = websocket; }).addListener("close", function() { sys.debug("User " + user_id + " disconnected.") }); }).listen(8080); Saturday, April 17, 2010

pubsub.stream.addListener('connect', function() { pubsub.subscribeTo("user:*:timeline", function(channel, data) { var uid = channel.toString().split(':')[1]; if (clients[uid]) { sys.debug("Writing " + data + " to " + uid) clients[uid].write(data); } else { sys.debug("User " + clients[uid] + " is not connected."); } }); }); Saturday, April 17, 2010

The Browser Code Saturday, April 17, 2010

if ("WebSocket" in window) { var ws = new WebSocket("ws://127.0.0.1:8080/timeline/" + current_user); ws.onmessage = function(evt) { $('ul.timeline').prepend("<li>" + evt.data + "</li>"); } } Saturday, April 17, 2010

How else can we use Node? Saturday, April 17, 2010

Asynchronous Applications Saturday, April 17, 2010

Push APIs • Want to notify API subscribers in real-time • Utilize Webhooks • Example: GitHub’s Service Hooks Saturday, April 17, 2010

File Transcoding Saturday, April 17, 2010

Online Gaming Saturday, April 17, 2010

Ephemeral Peer-to-Peer Saturday, April 17, 2010

Wrapping up... Saturday, April 17, 2010

Tip of the Iceberg • Node’s libraries and use cases are expanding rapidly • Async means thinking differently • Still at the early stages Saturday, April 17, 2010

howtonode.org Saturday, April 17, 2010

Node for Ruby? Saturday, April 17, 2010

EventMachine Saturday, April 17, 2010

Cramp Saturday, April 17, 2010

Use what feels right. Saturday, April 17, 2010

I don’t know the half of it. Saturday, April 17, 2010

Questions? Saturday, April 17, 2010

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Node.js and Ruby

by Michael Bleigh on Apr 17, 2010

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Node.js and Ruby — Presentation Transcript