Rails with Node.js - a Reese's Moment

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Rails with Node.js a Reese’s Moment Monday, September 26, 11

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Me Monday, September 26, 11

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In a Nutshell Monday, September 26, 11

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In a Nutshell • Framework for building network apps Monday, September 26, 11

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In a Nutshell • Framework for building network apps • First class evented I/O Monday, September 26, 11

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In a Nutshell • Framework for building network apps • First class evented I/O • Built on top of V8 Monday, September 26, 11

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What it ain’t Monday, September 26, 11

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What it ain’t • NOT a browser side Javascript library Monday, September 26, 11

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What it ain’t • NOT a browser side Javascript library • NOT a full ﬂedged webapp framework Monday, September 26, 11

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A Simple Example Monday, September 26, 11

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A Simple Example (1..3).each do |i| contents = File.read('presentation.key') puts "#{i}. Finished reading file" puts "#{i}. doing something important..." end Monday, September 26, 11

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A Simple Example 1. Finished reading file 1. doing something important... 2. Finished reading file 2. doing something important... 3. Finished reading file 3. doing something important... Monday, September 26, 11

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A Simple Example var fs = require('fs'); for (var i=1; i<=3; i++) { fs.readFile('presentation.key', function(err, data) { console.log(i + ". Finished reading file"); }); console.log(i + ". doing something important..."); } Monday, September 26, 11

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A Simple Example 1. doing something important... 2. doing something important... 3. doing something important... 4. Finished reading file 4. Finished reading file 4. Finished reading file Monday, September 26, 11

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Trust Callbacks Monday, September 26, 11

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Trust Callbacks • Async programming is trickier Monday, September 26, 11

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Trust Callbacks • Async programming is trickier • ...But it doesn’t block your other code Monday, September 26, 11

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Go to Jail “Node jails you into this evented- style programming. You can’t do things in a blocking way, you can’t write slow programs.” - Ryan Dahl Monday, September 26, 11

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Some Real Examples Monday, September 26, 11

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Some Real Examples • Real-time dashboards and analytics Monday, September 26, 11

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Some Real Examples • Real-time dashboards and analytics • Push notiﬁcations Monday, September 26, 11

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Some Real Examples • Real-time dashboards and analytics • Push notiﬁcations • Fast ﬁle uploads Monday, September 26, 11

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Dashboards + Analytics https://github.com/etsy/statsd Monday, September 26, 11

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Dashboards + Analytics http://hummingbirdstats.com/ Monday, September 26, 11

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Push Notifications https://github.com/mape/node-wargames Monday, September 26, 11

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File Uploaders Monday, September 26, 11

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File Uploaders • Slow to parse the encoded upload body Monday, September 26, 11

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File Uploaders • Slow to parse the encoded upload body • Post-processing & background jobs Monday, September 26, 11

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File Uploaders require 'sinatra' # curl -F "[email protected]" http://localhost:4567/upload post '/upload' do # already written to params[:data][:tempfile] "" end Monday, September 26, 11

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Upload Benchmarks MRI Ruby 1.8.7 and 1.9.2 with Sinatra 1.2.1 Node 0.5.0 2.66 GHz i7 2000 iterations on a 295 byte ﬁle Monday, September 26, 11

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Upload Benchmarks MRI Ruby 1.8.7 and 1.9.2 with Sinatra 1.2.1 Node 0.5.0 2.66 GHz i7 2000 iterations on a 295 byte ﬁle Monday, September 26, 11

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Upload Benchmarks MRI Ruby 1.8.7 and 1.9.2 with Sinatra 1.2.1 Node 0.5.0 2.66 GHz i7 2000 iterations on a 295 byte ﬁle Ruby 67 minutes 3.5 seconds Node 23.9 seconds Monday, September 26, 11

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Upload Benchmarks MRI Ruby 1.8.7 and 1.9.2 with Sinatra 1.2.1 Node 0.5.0 2.66 GHz i7 2000 iterations on a 295 byte ﬁle Ruby 67 minutes 3.5 seconds Node 23.9 seconds Monday, September 26, 11

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Upload Benchmarks MRI Ruby 1.8.7 and 1.9.2 with Sinatra 1.2.1 Node 0.5.0 2.66 GHz i7 2000 iterations on a 295 byte ﬁle Ruby 67 minutes 3.5 seconds Node 23.9 seconds Monday, September 26, 11

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Upload Benchmarks MRI Ruby 1.8.7 and 1.9.2 with Sinatra 1.2.1 Node 0.5.0 2.66 GHz i7 2000 iterations on a 295 byte ﬁle Ruby 67 minutes 3.5 seconds Node 23.9 seconds Monday, September 26, 11

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No Silver Bullet Monday, September 26, 11

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No Silver Bullet • Not a replacement for Ruby Monday, September 26, 11

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No Silver Bullet • Not a replacement for Ruby • Use where it makes sense Monday, September 26, 11

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No Silver Bullet • Not a replacement for Ruby • Use where it makes sense • Doesn’t guarantee scalability Monday, September 26, 11

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Wrapup Monday, September 26, 11

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Wrapup • Server side Javascript rules! Monday, September 26, 11

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Wrapup • Server side Javascript rules! • Event driven style of programming Monday, September 26, 11

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Wrapup • Server side Javascript rules! • Event driven style of programming • Good for speciﬁc problems Monday, September 26, 11

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Thanks! Questions? [email protected] @whatcodecraves http://whatcodecraves.com Monday, September 26, 11