Minimalist Rails

Transcript

1. Minimalist Rails Rack, Middleware, Minimal Stacks Wednesday, 28 March 12

2. Technical Director at Rumble Labs David Rice Wednesday, 28 March

   12

3. is a Web Software & Experience Design laboratory in Belfast,

   Northern Ireland http://rumblelabs.com Wednesday, 28 March 12

4. • Rails history • Rack • Rails —’s Middleware •

   Minimalist Rails Stack • Barebones Rails Stack Minimalist Rails Wednesday, 28 March 12

5. • Rails 2.3 introduced support for Rack • Rack spells

   the end of tying applications to a dispatcher / handler • Before then we had application dispatchers, CGI, FCGI • Communication between Rails and any web server is simpli ed Rails < 2.3 Wednesday, 28 March 12

6. Rails without CGI • Rails takes some time to boot,

   and CGI starts a new process for every request... • Your application needs to know about wether it runs under CGI, FCGI etc. • Applications are more portable Wednesday, 28 March 12

7. Rack • github.com/rack/rack • Rack is a modular web server

   interface • To connect ruby applications to the web • As of Rails 3 it and middleware are now a core concept Wednesday, 28 March 12

8. Hello Rack class HelloWorld def call(env) return [200, {}, ["Hello

   world!"]] end end Wednesday, 28 March 12

9. Supported Rack Servers •Mongrel •WEBrick •FCGI •CGI •SCGI •LiteSpeed •Thin

   •Ebb •Fuzed •Glass sh v3 Wednesday, 28 March 12

10. Deployment? • mod_rails (Apache/Nginx) • Reverse proxy (Apache/Nginx, HAProxy, Varnish)

    • JRuby (Jetty/Glass sh) Wednesday, 28 March 12

11. Middleware Wednesday, 28 March 12

12. Web Server Wednesday, 28 March 12

13. Wednesday, 28 March 12

14. Wednesday, 28 March 12

15. Rails —’s Middleware use ActionDispatch::Static use Rack::Lock use ActiveSupport::Cache::Strategy::LocalCache::Middleware use

    Rack::Runtime use Rack::MethodOverride use ActionDispatch::RequestId use Rails::Rack::Logger use ActionDispatch::ShowExceptions use ActionDispatch::DebugExceptions use ActionDispatch::RemoteIp use ActionDispatch::Reloader use ActionDispatch::Callbacks use ActiveRecord::ConnectionAdapters::ConnectionManagement use ActiveRecord::QueryCache use ActionDispatch::Cookies use ActionDispatch::Session::CookieStore use ActionDispatch::Flash use ActionDispatch::ParamsParser use ActionDispatch::Head use Rack::ConditionalGet use Rack::ETag use ActionDispatch::BestStandardsSupport run MyRailsApplication::Application.routes Wednesday, 28 March 12

16. Moar Middleware https://github.com/rack/rack/wiki/List-of-Middleware http://coderack.org/middlewares • Rack::Rewrite • Warden • Rack::ReverseProxy

    Wednesday, 28 March 12

17. require 'rubygems' require 'bundler' Bundler.require app = proc do |env|

    Rack::Directory.new('.').call(env) end wee_rack_app = Rack::Builder.new do use Rack::ContentLength use Rack::ReverseProxy do reverse_proxy /^\/couchdb(.*)$/, 'http://127.0.0.1:5984$1' reverse_proxy /^\/api(.*)$/, 'http://127.0.0.1:4000$1' end run app end run wee_rack_app con g.ru Wednesday, 28 March 12

18. Minimal Rails Dependencies Wednesday, 28 March 12

19. require File.expand_path('../boot', __FILE__) # require 'rails/all' # # require "active_record/railtie"

    require "action_controller/railtie" #require "action_mailer/railtie" #require "active_resource/railtie" #require "rails/test_unit/railtie" if defined?(Bundler) # If you precompile assets before deploying to production, use this line # Bundler.require *Rails.groups(:assets => %w(development test)) # If you want your assets lazily compiled in production, use this line Bundler.require(:default, :assets, Rails.env) end module CouchbaseTinyurl class Application < Rails::Application # ... # Configure the default encoding used in templates for Ruby 1.9. config.encoding = "utf-8" # Configure sensitive parameters which will be filtered from the log file. config.filter_parameters += [:password] # Enable the asset pipeline config.assets.enabled = true end end application.rb Wednesday, 28 March 12

20. # This file is used by Rack-based servers to start

    the application. require ::File.expand_path('../config/environment', __FILE__) run CouchbaseTinyurl::Application con g.ru Wednesday, 28 March 12

21. Minimalist Rails App Wednesday, 28 March 12

22. require "rails" require "rails/all" class MyApp < Rails::Application routes.append do

    match "/hello/world" => "hello#world" end config.cache_classes = true # Enable cache classes. Production style. config.middleware.delete "Rack::Lock" config.middleware.delete "ActionDispatch::Flash" config.middleware.delete "ActionDispatch::BestStandardsSupport" config.secret_token = "49837489qkuweoiuoqwehisuakshdjksadhaisdy78o34y138974xyqp9rmye8yrpiokeuioqwzyoiuxftoyqiuxrhm3iou1hrzmjk" end class HelloController < ActionController::Metal include ActionController::Rendering def world render :text => "Hello world!" end end MyApp.initialize! run MyApp con g.ru Wednesday, 28 March 12

23. Minimal Middleware Stack Wednesday, 28 March 12

24. ActionController::Dispatcher.middleware = ActionController::MiddlewareStack.new do |m| m.use ActionController::Failsafe m.use ActiveRecord::QueryCache m.use

    Rack::Head end con g/initializers/stack.rb Wednesday, 28 March 12

25. The Future • Rails 4 will have an API only

    middleware stack con guration • RocketPants (https://github.com/ ltersquad/rocket_pants) is an interesting alternative now Wednesday, 28 March 12

26. • https://github.com/rails/rails • https://github.com/rack/rack • http://guides.rubyonrails.org/rails_on_rack.html • http://piotrsarnacki.com/2010/12/12/lightweight-controllers-with-rails3/ • http://lenary.co.uk/rails/2010/07/middleware-part-1/

    • http://lenary.co.uk/rails/2010/07/middleware-part-2/ • https://gist.github.com/1942658 Further Reading Wednesday, 28 March 12

27. @davidjrice Thanks! Wednesday, 28 March 12