Rails Metal, Rack, and Sinatra

Rails Metal, Rack, and Sinatra Adam Wiggins Railsconf 2009

Show of hands, how many of you...

“The gateway drug”

“The gateway drug”* * it’s a myth, but makes good analogy

Rails Metal is a gateway

Rails Metal is a gateway to the world of Rack

What can you do with Metal?

Replace selected URLs for a speed boost

Example: auction site

Example: auction site on

Majority of traffic goes to: GET /auctions/id.xml

app/controller/auctions_controller.rb

app/controller/auctions_controller.rb class AuctionsController < ApplicationController def show @auction = Auction.find(params[:id]) respond_to do |format| format.html format.xml { render :xml => @auction } end end end

app/metal/auctions_api.rb

app/metal/auctions_api.rb class AuctionsApi def self.call(env) # implementation goes here end end

app/metal/auctions_api.rb class AuctionsApi def self.call(env) url_pattern = %r{/auctions/(d+).xml} if m = env['PATH_INFO'].match(url_pattern) # render the auction api else # pass (do nothing) end end end

app/metal/auctions_api.rb class AuctionsApi def self.call(env) url_pattern = %r{/auctions/(d+).xml} if m = env['PATH_INFO'].match(url_pattern) auction = Auction.find(m[1]) [ 200, {quot;Content-Typequot; => quot;text/xmlquot;}, auction.to_xml ] else [ 404, {}, '' ] end end end

[ 200, {quot;Content-Typequot;=>quot;text/plainquot;}, quot;Hello, Rack!quot; ]

http://www.slideshare.net/adamwiggins/ ruby-isnt-just-about-rails-presentation

An explosion of Ruby projects in the past 2 years

Tests/Specs Web Layer Test::Unit ActionController RSpec Merb Shoulda Sinatra ORM Templating ActiveRecord Erb DataMapper Haml Sequel Erubis Web Server HTTP Client Mongrel ActiveResource Thin RestClient Ebb HTTParty

Tests/Specs Web Layer Test::Unit ActionController ORM Templating ActiveRecord Erb Web Server HTTP Client Mongrel ActiveResource

Tests/Specs Web Layer Test::Unit ActionController RSpec Merb Shoulda Sinatra ORM Templating ActiveRecord Erb DataMapper Haml Sequel Erubis Web Server HTTP Client Mongrel ActiveResource Thin RestClient Ebb HTTParty

The world of Rack is now within reach from Rails

Sinatra The classy microframework for Ruby http://sinatrarb.com

require 'rubygems' require 'sinatra' get '/hello' do quot;Hello, whirledquot; end

$ ruby hello.rb == Sinatra/0.9.1.1 has taken the stage >> Thin web server (v1.0.0) >> Maximum connections set to 1024 >> Listening on 0.0.0.0:4567

$ ruby hello.rb == Sinatra/0.9.1.1 has taken the stage >> Thin web server (v1.0.0) >> Maximum connections set to 1024 >> Listening on 0.0.0.0:4567 $ curl http://localhost:4567/hello Hello, whirled

A minimalist paradise

require 'rubygems' require 'sinatra' require 'lib/article' post '/articles' do article = Article.create! params redirect quot;/articles/#{article.id}quot; end get '/articles/:id' do @article = Article.find(params[:id]) erb :article end

Sinatra in your Rails app?

Replace selected URLs for a speed boost

Replace selected URLs with Sinatra

app/metal/articles.rb

app/metal/articles.rb require 'sinatra/base' class Articles < Sinatra::Base post '/articles' do article = Article.create! params redirect quot;/articles/#{article.id}quot; end get '/articles/:id' do @article = Article.find(params[:id]) erb :article end end

Back to the auction example

ActionController class AuctionsController < ApplicationController def show @auction = Auction.find(params[:id]) respond_to do |format| format.html format.xml { render :xml => @auction } end end end

Pure Rack class AuctionsApi def self.call(env) url_pattern = /^/auctions/(d+).xml$/ if m = env['PATH_INFO'].match(url_pattern) auction = Auction.find(m[1]) [ 200, {quot;Content-Typequot; => quot;text/xmlquot;}, auction.to_xml ] else [ 404, {}, '' ] end end end

Sinatra get '/auctions/:id.xml' Auction.find(params[:id]).to_xml end

Sinatra get '/auctions/:id.xml' Auction.find(params[:id]).to_xml end Now that’s what I call minimalist.

The End. http://railscasts.com/episodes/150-rails-metal http://rack.rubyforge.org http://sinatrarb.com http://adam.blog.heroku.com Adam Wiggins Railsconf 2009

http://adam.blog.heroku.com	401
http://adam.heroku.com	159
http://adamblog.heroku.com	89
http://www.slideshare.net	86
http://damon.tumblr.com	39
http://verboselogging.com	36
http://localhost	11
http://lanyrd.com	10
http://scanty-redis.heroku.com	10
http://drawohara.com	9
http://ranchero.com	8
http://duckduckgo.com	2
http://www.techgig.com	2
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http://const-const.blogspot.com	1
http://feeds.feedburner.com	1
http://cassidy.d.damon.tumblr.com	1
http://tornado.heroku.com	1
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Rails Metal, Rack, and Sinatra

by Adam Wiggins on May 06, 2009

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