http://rack.github.com Thursday, November 11, 2010 Rack provides a - - PowerPoint PPT Presentation

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http://rack.github.com Thursday, November 11, 2010 Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills

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http://rack.github.com

Thursday, November 11, 2010

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Rack provides a minimal, modular and adaptable interface for developing web applications in Ruby. By wrapping HTTP requests and responses in the simplest way possible, it unifies and distills the API for web servers, web frameworks, and software in between (the so-called middleware) into a single method call.

http://rack.rubyforge.org/doc/

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Request => Response

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Request

HTTP CGI

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Response

Status Header Body

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Rack Spec

http://chneukirchen.org/talks/euruko-2007/neukirchen07introducingrack.pdf

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Demo

HTTP Client and HTTP Server

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Rack Distribution

Specification
Handlers
Adapters
Middlewares
Utilities

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Rack Specification

Rack::Lint

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Rack Handlers

CGI
FastCGI
Mongrel
WEBrick
Thin
Passenger
Unicorn

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Rack Adapters

Camping
Rails
Sinatra
....

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Camping Adapter

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Rack Middleware

Rack::Reloader
Rack::ShowExceptions
Rack::CommonLogger
Rack::Static

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Rack Utilities

Rack::Request + Rack::Response
Rack::MockRequest + Rack::MockResponse
Rack::Builder + rackup

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Debugging Libraries

Rack::Lint and Rack::ShowExceptions
Rack::Bug
Rack::Debug

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Advantages

Less Work
No external configuration
Easy to test

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Demo

Hello World Rack App

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Rack::Builder

Rack::Builder implements a small DSL to iteratively construct Rack applications.

http://rack.rubyforge.org/doc/classes/Rack/Builder.html

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The rackup file

Configuration DSL for a Rack app
Server independent
Allows stacking of middleware
Provides simple route mapping

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Routing

Rack::Builder
Rack::Mount
Rack::URLMap

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Middleware

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Middleware

Utilities that combine, compose, aggregate or modify

Rack application

Ruby Object
Stackable
Pipe for HTTP Processing

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Middleware

Just a Rack application
Constructor takes next app down
Can modify request or response
Can call layer below or just return
Configured with ‘use’ in rackup file

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HTTP APP \m/ \m/ \m/

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http://github.com/rack/rack-contrib

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Rails 2.3

http://guides.rubyonrails.org/rails_on_rack.html#internal-middleware-stack

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Rails 2.3

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SSO

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SSO

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SSO

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