And the Greatest of These Is ... Space

And the Greatest of These Is... Rack Support Ben Scoﬁeld – Viget Labs Saturday, July 25, 2009

Saturday, July 25, 2009

Application Templates Saturday, July 25, 2009

Nested Attribute Assignment ﬂickr: angelrays Saturday, July 25, 2009

ActiveRecord::Base#touch ﬂickr: jjjohn Saturday, July 25, 2009

DB Seeding ﬂickr: richardthomas78 Saturday, July 25, 2009

Rack Saturday, July 25, 2009

def call(env) [ status, # 200 headers, # {"Content-Type" => "text/html"} body # ["<html>...</html>"] ] end Saturday, July 25, 2009

request application response Saturday, July 25, 2009

request middleware application middleware response Saturday, July 25, 2009

Rack::Proﬁler ﬂickr: oberazzi Saturday, July 25, 2009

Rack::MailExceptions ﬂickr: warmnfuzzy Saturday, July 25, 2009

Rack::Cache ﬂickr: timpatterson Saturday, July 25, 2009

rack::cascade Rack::Cascade ﬂickr: _at Saturday, July 25, 2009

Rack in Rails Saturday, July 25, 2009

> rake middleware use Rack::Lock use ActionDispatch::ShowExceptions, [true] use ActionDispatch::Callbacks, [true] use ActionDispatch::Rescue, [#<Method: ...>] use ActionDispatch::Session::CookieStore, [{...}] use ActionDispatch::ParamsParser use Rack::MethodOverride use Rack::Head use ActiveRecord::ConnectionAdapters::ConnectionManagement use ActiveRecord::QueryCache run ActionController::Dispatcher.new Saturday, July 25, 2009

app = Rack::Builder.new { use Rails::Rack::LogTailer unless options[:detach] use Rails::Rack::Debugger if options[:debugger] map "/" do use Rails::Rack::Static run ActionController::Dispatcher.new end }.to_app Saturday, July 25, 2009

Rails::Initializer.run do |config| config.middleware.insert_before Rack::Head, Ben::Asplode config.middleware.swap Rack::Lock, Ben::Lock config.middleware.use Rack::MailExceptions end Saturday, July 25, 2009

# in config/initializers/middlewares.rb Rails::Initializer.run do |config| config.middleware.insert_before Rack::Head, Ben::Asplode ActionController::Dispatcher.middleware.insert_before 'Rack::Head', Appender config.middleware.swap Rack::Lock, Ben::Lock ActionController::Dispatcher.middleware.delete 'Rack::Lock' config.middleware.use Rack::MailExceptions ActionController::Dispatcher.middleware.use Prepender end Saturday, July 25, 2009

Metal ﬂickr: lrargerich Saturday, July 25, 2009

http://www.kiwibean.com/ Saturday, July 25, 2009

PLEASE testing metalBY EXPAND: STAND THIS IS ONLY A TEST Saturday, July 25, 2009

METAL Sinatra Saturday, July 25, 2009

Cool Tricks Saturday, July 25, 2009

Rack::Bug ﬂickr: catdancing Saturday, July 25, 2009

requires </body> Saturday, July 25, 2009

Progressive Caching Saturday, July 25, 2009

class SessionsController < ApplicationController def create # ... session[:personalize] = { :logged_in => true, :quicklist => current_user.quicklist.episode_ids, :subscriptions => current_user.subscription_ids } end end Saturday, July 25, 2009

class ChannelsController < ApplicationController caches_page :show def show @channel = Channel.find(params[:id]) end end Saturday, July 25, 2009

$(document).ready(function() { $.getJSON('/personalize', function(data) { // identify quicklisted episodes $.each(data['quicklist'], function() { $('#episode_'+this).addClass('listed'); }); // switch navigation if (data['logged_in']) { $('#logged_in_nav').show(); } // etc. }); }); Saturday, July 25, 2009

class Personalizer def self.call(env) if env["PATH_INFO"] =~ /^/personalize/ [ 200, {"Content-Type" => "application/javascript"}, env['rack.session'][:personalize].to_json ] else [404, {"Content-Type" => "text/html"}, ["Not Found"]] end end end Saturday, July 25, 2009

class PullList def self.call(env) if env["PATH_INFO"] =~ /^/pulls/ [ 200, {"Content-Type" => "application/javascript"}, [Pull.by_user(user).for_date(date).map {|i| i.item_id}.to_json]] else [404, {"Content-Type" => "text/html"}, ["Not Found"]] end end end standard 0.617 progressive 0.039 0.096 Saturday, July 25, 2009

class PullList def self.call(env) if env["PATH_INFO"] =~ /^/pulls/ [ 200, {"Content-Type" => "application/javascript"}, [env['rack.session'][:pulls].to_json] ] else [404, {"Content-Type" => "text/html"}, ["Not Found"]] end end end standard 0.617 progressive 0.039 0.096 progressive v2 0.043 0.023 Saturday, July 25, 2009

DIY Saturday, July 25, 2009

request middleware application middleware response Saturday, July 25, 2009

Rack::Embiggener Saturday, July 25, 2009

class Embiggener < Test::Unit::TestCase def test_embiggener_should_embiggen_known_url body = ["Hello! I'm at http://bit.ly/31IqMl"] assert_equal ["Hello! I'm at http://cnn.com"], Rack:: Embiggener.embiggen_urls(body) end def test_embiggener_should_embiggen_multiple_urls body = [ "Hello! I'm at http://bit.ly/31IqMl", "And I'm at http://bit.ly/31IqMl" ] assert_equal [ "Hello! I'm at http://cnn.com", "And I'm at http://cnn.com" ], Rack::Embiggener.embiggen_urls(body) end end Saturday, July 25, 2009

module Rack class Embiggener def self.embiggen_urls(original_body, login, key) new_body = [] original_body.each { |line| bits = line.scan(/(http://bit.ly/(.{6}))/) new_body << bits.uniq.inject(line) do |body, bit| original_bit, hash = *bit new_url = embiggened_url(hash, login, key) body.gsub(original_bit, new_url) if new_url end } new_body end # ... end end Saturday, July 25, 2009

module Rack class Embiggener # ... def self.embiggened_url(hash, login, key) url = [ "http://api.bit.ly/expand?version=2.0.1", "shortUrl=http://bit.ly/#{hash}", "login=#{login}", "apiKey=#{key}" ].join('&') response = JSON.parse(Net::HTTP.get_response(URI.parse(url))) if response['statusCode'] = 'OK' embiggened_url = response['results'][hash]['longUrl'] end end # ... end end Saturday, July 25, 2009

module Rack class Embiggener # ... attr_accessor :api_login, :api_key def initialize(app, api_login, api_key) @app = app @api_login = api_login @api_key = api_key end def call(env) status, headers, body = @app.call(env) headers.delete('Content-Length') response = Rack::Response.new( Rack::Embiggener.embiggen_urls(body, api_login, api_hash), status, headers ) response.finish return response.to_a end end end Saturday, July 25, 2009

module Rack class Embiggener def self.embiggen_urls(original_body, login, key) new_body = [] original_body.each { |line| bits = line.scan(/bit:(w+?)/) new_body << bits.uniq.inject(line) do |body, bit| hash = bit.first original_bit = "bit:#{hash}" new_url = embiggened_url(hash, login, key) body.gsub(original_bit, new_url) if new_url end } new_body end # ... end end Saturday, July 25, 2009

module Rack class Embiggener # ... def self.embiggened_url(hash, login, key) url = [ "http://api.bit.ly/expand?version=2.0.1", "hash=#{hash}", "login=#{login}", "apiKey=#{key}" ].join('&') response = JSON.parse(Net::HTTP.get_response(URI.parse(url))) if response['statusCode'] = 'OK' embiggened_url = response['results'][hash]['longUrl'] end end # ... end end Saturday, July 25, 2009

WARNING exception handling Saturday, July 25, 2009

formerly: WARNING exception handling Saturday, July 25, 2009

Rack::Hoptoad* * unoﬃcial; thoughtbot is not responsible for this middleware; do not taunt rack::hoptoad; pregnant women should consult their doctors before using rack::hoptoad Saturday, July 25, 2009

> rake middleware use Rack::Lock use ActionDispatch::ShowExceptions, [true] use ActionDispatch::Callbacks, [true] use ActionDispatch::Rescue, [#<Method: ...>] use ActionDispatch::Session::CookieStore, [{...}] use ActionDispatch::ParamsParser use Rack::MethodOverride use Rack::Head use ActiveRecord::ConnectionAdapters::ConnectionManagement use ActiveRecord::QueryCache run ActionController::Dispatcher.new Saturday, July 25, 2009

ActionController::Dispatcher.middleware.delete ActionDispatch::ShowExceptions ActionController::Dispatcher.middleware.delete ActionDispatch::Rescue ActionController::Dispatcher.middleware.use 'Rack::Hoptoad', 'my-api-key' ActionController::Dispatcher.middleware.use 'Rack::ShowExceptions' Saturday, July 25, 2009

module Rack class Hoptoad def initialize(app, api_key) @app = app @api_key = api_key end def call(env) @app.call(env) rescue => exception notify_hoptoad(exception, env) raise exception end # ... end end Saturday, July 25, 2009

module Rack class Hoptoad def notify_hoptoad(exception, env) headers = { 'Content-type' => 'application/x-yaml', 'Accept' => 'text/xml, application/xml' } url = URI.parse("http://hoptoadapp.com/notices") http = Net::HTTP.new(url.host, url.port) data = { :api_key => @api_key, :error_message => "#{exception.class}: #{exception}", :backtrace => exception.backtrace, :request => {}, :session => env['rack.session'], :environment => env } response = http.post( url.path, stringify_keys(:notice => data).to_yaml, headers ) if response != Net::HTTPSuccess # Hoptoad post failed end end end end Saturday, July 25, 2009

Intangibles Saturday, July 25, 2009

Thank You ben scofield - @bscofield - http://www.viget.com/extend - http://www.speakerrate.com/bscofield Saturday, July 25, 2009

And the Greatest of These Is ... Space

0 comments

Notes on slide 1

3 Favorites