rails metal, rack, and sinatra

Adam WigginsRailsconf 2009

Rails Metal,Rack, and Sinatra

Show of hands, how many of you...

metal

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 theworld of Rack

What can you do with Metal?

Replace selected URLs for a speed boost

Example: auction site

Example: auction site

Example: auction site

on

Majority of traffic goes to:

GET /auctions/id.xml

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 endend

app/controller/auctions_controller.rb

app/metal/auctions_api.rb

class AuctionsApi def self.call(env) # implementation goes here

endend

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 endend

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, {"Content-Type" => "text/xml"}, auction.to_xml ] else [ 404, {}, '' ] end endend

app/metal/auctions_api.rb

[ 200, {"Content-Type"=>"text/plain"}, "Hello, Rack!"]

[ 200, {"Content-Type"=>"text/plain"}, "Hello, Rack!"]

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

An explosion of Ruby projects in the past 2 years

Web LayerActionControllerMerbSinatra

ORMActiveRecordDataMapperSequel

Tests/SpecsTest::UnitRSpecShoulda

TemplatingErbHamlErubis

HTTP ClientActiveResourceRestClientHTTParty

Web ServerMongrelThinEbb

Web LayerActionController

ORMActiveRecord

Tests/SpecsTest::Unit

TemplatingErb

HTTP ClientActiveResource

Web ServerMongrel

Web LayerActionController

ORMActiveRecord

Tests/SpecsTest::Unit

TemplatingErb

HTTP ClientActiveResource

Web ServerMongrel

Web LayerActionControllerMerbSinatra

ORMActiveRecordDataMapperSequel

Tests/SpecsTest::UnitRSpecShoulda

TemplatingErbHamlErubis

HTTP ClientActiveResourceRestClientHTTParty

Web ServerMongrelThinEbb

Web LayerActionControllerMerbSinatra

ORMActiveRecordDataMapperSequel

Tests/SpecsTest::UnitRSpecShoulda

TemplatingErbHamlErubis

HTTP ClientActiveResourceRestClientHTTParty

Web ServerMongrelThinEbb

Web LayerActionControllerMerbSinatra

ORMActiveRecordDataMapperSequel

Tests/SpecsTest::UnitRSpecShoulda

TemplatingErbHamlErubis

HTTP ClientActiveResourceRestClientHTTParty

Web ServerMongrelThinEbb

The world of Rack is now within reach from Rails

The classy microframework for Ruby

http://sinatrarb.com

Sinatra

require 'rubygems'require 'sinatra'

get '/hello' do "Hello, whirled"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/helloHello, whirled

A minimalist paradise

require 'rubygems'require 'sinatra'require 'lib/article'

post '/articles' do article = Article.create! params redirect "/articles/#{article.id}"end

get '/articles/:id' do @article = Article.find(params[:id]) erb :articleend

Sinatra in your Rails app?

Replace selected URLs for a speed boost

Replace selected URLs for a speed boost

Replace selected URLs with Sinatra

app/metal/articles.rb

require 'sinatra/base'

class Articles < Sinatra::Base post '/articles' do article = Article.create! params redirect "/articles/#{article.id}" end

get '/articles/:id' do @article = Article.find(params[:id]) erb :article endend

app/metal/articles.rb

Back to the auction example

Back to the auction example

class AuctionsController < ApplicationController def show @auction = Auction.find(params[:id])

respond_to do |format| format.html format.xml { render :xml => @auction } end endend

ActionController

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, {"Content-Type" => "text/xml"}, auction.to_xml ] else [ 404, {}, '' ] end endend

Pure Rack

get '/auctions/:id.xml' Auction.find(params[:id]).to_xmlend

Sinatra

Sinatra

Now that’s what I call

minimalist.

get '/auctions/:id.xml' Auction.find(params[:id]).to_xmlend

The End.

http://adam.blog.heroku.com

Adam WigginsRailsconf 2009

http://railscasts.com/episodes/150-rails-metal

http://sinatrarb.comhttp://rack.rubyforge.org