Rack - A interface por trás dos frameworks web em Ruby

https://pt-br.eventials.com/locaweb/rack-the-interface-behind-rails-sinatra-and-hanami-com-philippe-hardardt/

Transcript

1. Rack A interface por trás dos frameworks web em Ruby
2. Oi, eu sou o Phil
4. O que é Rack?
5. Ruby Gem
6. "Uma interface Ruby para webservers”
8. careers.plataformatec.com.br
9. Servidor de aplicação Aplicação Ruby Navegador GET careers.plataformatec.com.br HTTP Rack API P U M A
10. Mas como é essa interface?
13. class MyApp def call(env) status = 200 # ok headers = {'Content-Type' => 'text/html'} body = ['<p>Hello Rubyconf!</p>'] [status, headers, body] end end
14. class MyApp def call(env) status = 200 # ok headers = {'Content-Type' => 'text/html'} body = ['<p>Hello Rubyconf!</p>’] [status, headers, body] end end { "HTTP_ACCEPT" => “text/html, ...", "HTTP_USER_AGENT" => "Mozilla/5.0...", "REQUEST_PATH" => "/posts", "REQUEST_METHOD" => "GET", "rack.version" => [1, 3], "rack.request.query_string" => "", "rack.request.query_hash" => {}, "rack.request.cookie_hash" => {} ... }
15. class MyApp def call(env) status = 200 # ok headers = {'Content-Type' => 'text/html'} body = ['<p>Hello Rubyconf!</p>'] [status, headers, body] end end
16. ~código ao vivo~
17. Middlewares
18. Módulos que ajudam a processar uma requisição
19. Pipeline
21. careers.plataformatec.com.br
22. M iddlew are 1 M iddlew are 2 M iddlew are 3 M iddlew are 4 REQUISIÇÃO RESPOSTA
23. Com m onLogger M iddlew are 2 M iddlew are 3 M iddlew are 4 127.0.0.1 - - [07/Nov/2017:00:46:36 -0200] "GET / HTTP/1.1" 200 - 0.0003 127.0.0.1 - - [07/Nov/2017:00:46:41 -0200] "GET / HTTP/1.1" 200 - 0.0003 127.0.0.1 - - [07/Nov/2017:00:46:41 -0200] "GET / HTTP/1.1" 200 - 0.0003 127.0.0.1 - - [07/Nov/2017:00:46:45 -0200] "GET / HTTP/1.1" 200 - 0.0003 127.0.0.1 - - [07/Nov/2017:00:46:55 -0200] "GET /products/2 HTTP/1.1" 200 - 0.0003 127.0.0.1 - - [07/Nov/2017:00:47:02 -0200] "GET /products/2 HTTP/1.1" 200 - 0.0003 127.0.0.1 - - [07/Nov/2017:00:47:04 -0200] "GET /products HTTP/1.1" 200 - 0.0005 127.0.0.1 - - [07/Nov/2017:00:47:05 -0200] "GET /products/1 HTTP/1.1" 200 - 0.0003 127.0.0.1 - - [07/Nov/2017:00:47:07 -0200] "GET /products/3 HTTP/1.1" 200 - 0.0003 127.0.0.1 - - [07/Nov/2017:00:47:09 -0200] "GET /products/2 HTTP/1.1" 200 - 0.0005
24. M iddlew are 3 M iddlew are 4 a Com m onLogger Autenticação 401 UNAUTHORIZED ⛔
25. class MyMiddleware def initialize(app) @app = app end def call(env) # before logic @app.call(env) # after* logic end end
26. class MyMiddleware def initialize(app) @app = app end def call(env) # before logic @app.call(env) # after* logic end end
27. class MyMiddleware def initialize(app) @app = app end def call(env) # before logic @app.call(env) # after* logic end end
28. class MyMiddleware def initialize(app) @app = app end def call(env) # before logic @app.call(env) # after* logic end end
29. class MyMiddleware def initialize(app) @app = app end def call(env) # before logic @app.call(env) # after* logic end end
30. • Conexão com o banco de dados • Autenticação • Telas de erro (exceção) • Rate limit • Controle de cookies • Roteamento • Recarregamento automático de código • Profiling • Arquivos estáticos
31. Funciona com qualquer framework baseado em Rack ✨
32. $ rails middleware
33. use Rack::Sendfile use ActionDispatch::Static use ActionDispatch::Executor use Rack::Runtime use Rack::MethodOverride use ActionDispatch::RequestId use ActionDispatch::RemoteIp use Sprockets::Rails::QuietAssets use Rails::Rack::Logger use ActionDispatch::ShowExceptions use WebConsole::Middleware use ActionDispatch::DebugExceptions use ActionDispatch::Reloader use ActionDispatch::Callbacks use ActiveRecord::Migration::CheckPending use ActionDispatch::Cookies ...
35. class ActiveRecord::Migration::CheckPending def initialize(app) @app = app end def call(env) # raises error if there are pending migrations ActiveRecord::Migration.check_pending!(connection) @app.call(env) end def connection ActiveRecord::Base.connection end end
36. class ActiveRecord::Migration::CheckPending def initialize(app) @app = app end def call(env) # raises error if there are pending migrations ActiveRecord::Migration.check_pending!(connection) @app.call(env) end def connection ActiveRecord::Base.connection end end
37. Problemas
38. Template Streaming (Rails 3)
41. Como funciona internamente
42. class MyApp def call(env) status = 200 # ok headers = {'Content-Type' => 'text/html'} body_html = [ 'My e-commerce!’, lazy_view ] [status, headers, body_html] end end
43. class MyApp def call(env) status = 200 # ok headers = {'Content-Type' => 'text/html'} body_html = [ 'My e-commerce!', lazy_view ] [status, headers, body_html] end end
44. class MyApp def call(env) status = 200 # ok headers = {'Content-Type' => 'text/html'} body_html = [ 'My e-commerce!', lazy_view ] [status, headers, body_html] end end
45. class MyApp def call(env) status = 200 # ok headers = {'Content-Type' => 'text/html'} body_html = [ 'My e-commerce!', lazy_view ] [status, headers, body_html] end end
46. O problema
47. class DBConnectionMiddleware def call(env) connection = DB.checkout_connection env['db.connection'] = connection @app.call(env) ensure DB.checkin_connection connection end end
48. class DBConnectionMiddleware def call(env) connection = DB.checkout_connection env['db.connection'] = connection @app.call(env) ensure DB.checkin_connection connection end end
49. class DBConnectionMiddleware def call(env) connection = DB.checkout_connection env['db.connection'] = connection @app.call(env) ensure DB.checkin_connection connection end end
50. class DBConnectionMiddleware def call(env) connection = DB.checkout_connection env['db.connection'] = connection @app.call(env) ensure DB.checkin_connection connection end end
51. class DBConnectionMiddleware def call(env) connection = DB.checkout_connection env['db.connection'] = connection @app.call(env) ensure DB.checkin_connection connection end end
52. http://bit.ly/tenderlove_rack_api
53. http://bit.ly/valim_rack_api
55. A Web está (sempre) mudando
56. Existem fluxos que fogem do modelo pedido / resposta
57. Websockets ↔ (Action Cable)
58. build passou ✅ novo comentário análise de código completa ✅ GitHub conexão bidirecional
59. Server push (HTTP/2) ⏩
60. carreers.plataformatec.com.br index.html logo.png layout.css
61. class MyApp def call(env) status = 200 # ok headers = {'Content-Type' => 'text/html'} body = ['<p>Hello Rubyconf!</p>’] [status, headers, body] end end 1 requisição 1 resposta
63. Rack 3
65. Streams
67. Eventos
68. ✂ middlewares (Node.js / Connect)
69. Retrocompatível
70. Conclusões
72. Conheça o funcionamento das coisas que você usa ⚙
74. Bons exemplos
75. Entender e resolver problemas
76. Estamos contratando! http://careers.plataformatec.com.br
77. Obrigado! peagha @philHenri