rails metal, rack, and sinatra

Adam WigginsRailsconf 2009

Rails Metal,Rack, and Sinatra

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

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


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


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


[ 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 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 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

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

rails metal, rack, and sinatra

Technology

end end end

xml end

whirledquot end

pattern auction

auction example

auction apielse

auction siteon

rails metal