Ruby off Rails---rack, sinatra and sequel

Ruby off Rails Rack, Sinatra and Sequel Jiang Wu 2009.3.14

Outline

Rack

Sinatra

Sequel

Ruby off Rails

Rails Metal: A way of fusion

rack http://rack.rubyforge.net/ Rack aims to provide a minimal API for connecting web servers and web frameworks.

Rack SPEC {"HTTP_USER_AGENT"=>"curl/7.12.2 ...", "REQUEST_URI"=>"http://ruby-lang.org/", "QUERY_STRING"=>"", "HTTP_ACCEPT"=>"*/*", "REQUEST_METHOD"=>"GET", "rack.input" => '...', ... } call(env) [status, headers, body] to_i each each [String,String] String yields yields

Rack middleware: process RESP RESP RESP Rack Middleware 1 Rack Middleware 3 Rack Middleware 2

A rack middleware can do:

Do nothing (usually after a condition judgment)

Response directly

Alter environment variables

Alter response(body, headers and status code)

Write your own rack middleware

nothing.ru

middleware do nothing

calc_time.ru

add response time to body

method_override.ru

alter HTTP method

sinatra http://www.sinatrarb.com/

sinatra program: infinity.rb

1 require 'rubygems'

2 require 'sinatra'

3

4 use Rack::CommonLogger

5 use Rack::ShowExceptions

6

7 get '/' do

8 "Hello, Sinatra"

9 end

10

11 get '/version' do

12 "infinity 0.1"

13 end

14

15 get '/version/last' do

16 "infinity beta 0.13"

17 end

sequel The Database Toolkit for Ruby sequel postgres://localhost/blog Your database is stored in DB... >> DB.tables => [:blogs, :tags] >> require 'logger' >> DB.logger = Logger.new(STDOUT) >> DB[:tags].filter(:count > 100).order( :name.desc).limit(5).all INFO -- : SELECT * FROM "tags" WHERE ("count" > 150) ORDER BY "name" DESC LIMIT 5 >> class Tag < Sequel::Model;end >> Tag.filter(:count > 150).order(:name.desc).limit(5).all

sinatra + sequel: a simple note ruby notes.rb Just ONE file to run!

Ruby off Rails

jquery vs. prototype.js

jquery UI vs. script.aculo.us

extlib vs. ActiveSupport

sequel vs. ActiveRecord

sinatra vs. ActionPack

pony vs. ActionMailer

rest-client vs. ActiveResource

Off Rails if you ...

Hate the namespace pollution

Prototype.js

ActiveSupport

ActiveRecord pollutes collection

Want to use a dispatcher based on URL

Hate the constraints

Constraint of program structure

Constraint of table structure

Constraint of URL structure

Want to speed up

Speed up upload

Speed up performance

Speed up test performance

On Rails if you ...

Need mature plug-ins

Need write-through cache(with support from Cache-money)

Need existing view helpers

Need help from community

Rails metal: new in 2.3

If you have a Rails application that has service end

points that need to be really, really fast. So fast that

the few milliseconds that a trip through the Rails router

and Action Controller path is too much.

For this scenario, we’ve built a thin wrapper around

the generic Rack middleware and given it a place in

the hierarchy along with the name “ Metal ” .

Introducing Rails Metal

—— DHH

Rails Metal: the code

“Hello World” Metal:

class Poller < Rails::Rack::Metal

def call(env)

if env["PATH_INFO"] =~ /^/poller/

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

else

[404, {"Content-Type" => "text/html"}, "Not Found"]

end

end

end

“ Hello World” controller:

class OldPollerController < ApplicationController

def poller

render :text => "Hello World!"

end

end

Rails Metal and sinatra

1 require 'sinatra/base'

2

3 class Hello < Sinatra::Base

4 # all options are available for the setting:

5 enable :static, :session

6 set :root, File.dirname(__FILE__)

7

8 # each subclass has its own private middleware stack:

9 #use Rack::Deflater

10

11 get '/sinatra' do

12 "Hello, sinatra"

13 end

14 end

Speed contrast: sequel and metal

Ubuntu 8.04, Intel Atom N270 @1.60GHz, 100 requests,

development mode

Traditional Rails MVC

Requests per second: 16.69 [#/sec] (mean)

Time per request: 59.923 [ms] (mean)

Rails Metal

Sinatra standalone ( 3 times of Rails Metal! )

Questions?

Thank you!

http://masterwujiang.javaeye.com/

my blog (Chinese only)

http://github.com/nouse/ruby-off-rails/tree/master

whole ruby files running in this presentation

Jiang Wu

Shanghai on Rails

2009.3.14

Ruby off Rails---rack, sinatra and sequel

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