Como pegar um Trem em movimento

Palestra apresentada na RubyConfBrazil 2013. Aborda práticas, convenções e algumas ferramentas que facilitam a integração de novos membros à projetos Rails existentes.

Transcript

1. Como pegar um trem em movimento Carlos Souza @caike http://www.flickr.com/photos/mostli/1592641867/
2. $ git clone url $ cd project $ bundle $ rake db:setup $ rails s $$$$
4. Quatro Aspectos ★uno ★dos ★tres ★catorce ?!
5. Set up Código História Deployment
6. História Set up Código Deployment
7. entender o passado nos ajuda a tomar melhores decisões no futuro
8. $ git add app/models/user.rb $ git commit -m "Removed validation for cpf. " evite mensagens redundantes
10. $ git add app/models/user.rb $ git commit -m "Removed validation for cpf. " evite mensagens redundantes
11. $ git add app/models/user.rb $ git commit -m "Removed validation for cpf. evite mensagens redundantes
12. $ git add app/models/user.rb $ git commit -m \ "Removed validation for cpf. Most users are not from Brazil and cpf is only required there." evite mensagens redundantes
13. agrupe arquivos relacionados
14. agrupe arquivos relacionados
15. add interactive $ git add -i
21. História Set up Código Deployment
23. • Dependências do Sistema • Configurações • Banco de Dados • Como rodar testes • Outros serviços • Deployment
24. Rails 4!
25. version of Ruby 2.0.0-p195 jruby-1.7.4 1.9.3-p392 1.9.3-perf 1.9.3-gimme-fuel-gimme-fire-gimme-that-which-I-desire
26. $ bundle check source 'https://rubygems.org' gem 'rails', '4.0.0' gem 'pg' gem 'sass-rails', '~> 4.0.0' ... Your Ruby version is 1.8.7, but your Gemfile specified 1.9.3 Gemfile , :engine => 'jruby', :engine_version => '1.6.7' Your Ruby engine is ruby, but your Gemfile specified jruby ruby '1.9.3'
27. http://localhost:3000 ? https://billing.my-site.dev ? POW ? lvh.me ?
28. Web app Scheduler Workers 1. bundle exec rails server 2. bundle exec rake worker 3. bundle exec rake urgent_worker 4. bundle exec rake scheduler 5. ... ?
29. web: bundle exec rails s -p $PORT worker: bundle exec rake worker urgentworker: bundle exec rake urgent_worker scheduler: bundle exec rake scheduler Procfile
30. Foreman 13:44:20 web.1 | started with pid 82891 13:44:20 worker.1 | started with pid 82892 13:44:20 urgentworker.1 | started with pid 82893 13:44:20 scheduler.1 | started with pid 82894 13:44:25 web.1 | => Booting Puma 13:44:25 web.1 | => Rails 4.0.0 application starting in development on http://0.0.0.0:5000 13:44:25 web.1 | => Run `rails server -h` for more startup options 13:44:25 web.1 | => Ctrl-C to shutdown server 13:44:25 scheduler.1 | Scheduler.. 13:44:25 urgentworker.1 | Urgent worker.. 13:44:25 worker.1 | Worker.. 13:44:26 web.1 | Puma 2.0.1 starting... 13:44:26 web.1 | * Min threads: 0, max threads: 16 13:44:26 web.1 | * Environment: development 13:44:26 web.1 | * Listening on tcp://0.0.0.0:5000 $ foreman start $ gem install foreman
31. Foreman $ ./bin/mongod --dbpath=data $ echo 'server: ./bin/mongod --dbpath=data' > Procfile $ foreman start
32. Vagrant ?! ...porém, não para todos os seus projetos. SIM...
33. Set up Código História Deployment
34. Crie novas abstrações
35. class User < ActiveRecord::Base before_create :background_check attr_accessor :from_web protected def background_check if from_web && (!valid_ssn? && !valid_address?) # error message... return false end end end
36. class UsersController < ApplicationController def create @user = User.new(user_params) @user.from_web = true if @user.save # ... end end
37. class User < ActiveRecord::Base # associations.. # validations.. def register # ... end def subscribe activate_recurring_payment subscribe_to_newsletter end def cancel_subscription deactivate_recuring_payment unsubscribe_from_newsletter end def suspend deactivate_recuring_payment end def unsuspend activate_recurring_payment end # etc... private def activate_recurring_payment; def subscribe_to_newsletter; def deactivate_recuring_payment; def unsubscribe_from_newsletter; end
38. class UserRegistration attr_reader :user def initialize(params) @ssn = params.delete(:ssn) @address = params.delete(:address) @user = User.new(params) end def create user.save if valid_background_check? end private def valid_background_check? valid_ssn? && valid_address? end end
39. class UsersController < ApplicationController def create @user_registration = UserRegistration.new(user_params) if @user_registration.create # ... end end
40. class UserRegistration attr_reader :user def initialize(params) @ssn = params.delete(:ssn) @address = params.delete(:address) @user = User.new(params) end def create user.is_approved = valid_background_check? user.save end private def valid_background_check? valid_ssn? && valid_address? end end
41. https://github.com/discourse/discourse/commit/ 916a3f33f200f9ffa26588036b95481a08fbd3cb UserActivator
42. • UserRegistration • UserCancelation • ShoppingCart • CreditCardCharger
43. js, coffee, erb, haml, css, sass, less
44. Set up Código História Deployment
45. Não use WEBrick em Produção
46. source 'https://rubygems.org' ruby '1.9.3' gem 'rails', '4.0.0' gem 'pg' gem 'sass-rails', '~> 4.0.0' ... Gemfile gem 'thin' => Booting Thin => Rails 4.0.0 application starting in development on http://0.0.0.0:3000 => Run `rails server -h` for more startup options => Ctrl-C to shutdown server >> Thin web server (v1.5.0 codename Knife) >> Maximum connections set to 1024 $ rails s
47. Cookies in Rails 3 def create ... session[:user_id] = user.id end cookie digitally signed visto no browser require 'rack' cookie = "BAh7CUkiD3Nlc3Npb25faWQGOgZFRkkiJ(...)" Rack::Session::Cookie::Base64::Marshal.new.decode(cookie) => {"session_id"=>"d3b170ba43a95f93e915388e62acdf6a", "user_id"=>"123", "_csrf_token"=>"rtkofTr8uQnCHc8CMxdpFHD(...)"} Lendo conteúdo de um cookie digitally signed
48. require 'rack' cookie = "REE3QXILcHNsNHduU0t3eGMrcTA4dUhp(...)" Rack::Session::Cookie::Base64::Marshal.new.decode(cookie) => nil Lendo conteúdo de um cookie encrypted def create ... session[:user_id] = user.id end cookie encrypted visto no browser Cookies in Rails 4
49. Cookies MyApp::Application.config.secret_key_base = '7014c379b14b6f4(...)' config/initializers/secret_token.rb
50. Cookies config/initializers/secret_token.rb MyApp::Application.config.secret_key_base = ENV['SECRET_KEY_BASE'] armazenado em variável de ambiente
51. Credenciais config/initializers/ebay.rb ENV['S3_BUCKET'] ENV['EBAY_API_KEY'] config/initializers/s3.rb config/initializers/payment_gateway.rb ENV['PAYMENT_API_TOKEN']
52. Foreman web: bundle exec rails s -p $PORT Procfile .env PORT=3001 SECRET_KEY_BASE=cd606ce82c02c70141d5...
54. Set up Código História Deployment
55. Referências
56. http://12factor.net
57. http://upgradingtorails4.com
58. http://rails4patterns.codeschool.com
60. Como pegar um trem em movimento Carlos Souza @caike http://www.flickr.com/photos/mostli/1592641867/ Obrigado!