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

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Ruby off Rails---rack, sinatra and sequel

by Jiang Wu on Mar 15, 2009

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