Rack : A Framework to roll your own

( Ruby Conf Australia 2014 )

What is common between Rails, Sinatra and numerous other Ruby frameworks?

They are built on top of Rack or have Rack interfaces for allowing application servers to connect to them.

A deep-dive of sorts on Rack and see what it takes to build a framework, helping us understand these better and ultimately rolling our own.

Almost anyone doing a Ruby app ends up using Rack in one way or the other without ever realising the magic and simplicity that it provides. This session should help decoding that and provide ways on writing your own frameworks.

In involved live coding a framework that is very similar in structure to rails but is bare bones.

Transcript

1. RACK a framework to roll your own @nishantmodak Revealing Hour Creations t revealinghour.in
3. Donald Knuth Email is a wonderful thing for people whose role in life is to be on top of things. But not for me; my role is to be on the bottom of things. http://www-cs-faculty.stanford.edu/~knuth/email.html
4. SERVER What is Rack? APPLICATION / FRAMEWORK SERVER
5. 1. Web Server Interface 2. Tool for composing web applications 3. Collection of middleware utilities What is Rack?
6. RACK
7. config.ru $ rackup
8. APP HTTP INTERMEDIARIES Middleware
9. HTTP APPLICATION M I D D L E W A R E
10. DSL use, run, map lib/builder.rb
11. DEMO 1. MyRackApp 2. Middlewares - use / run / map 3. Rack Code
12. Rack::Builder
14. > rake middleware
15. MIDDLEWARE MIDDLEWARE MIDDLEWARE ROUTING MIDDLEWARE APPLICATION APPLICATION SERVER FRAMEWORK
16. Yay! Full Stack Developers!
17. WHY ANOTHER FRAMEWORK ?
18. Yes, We CAN !
19. CRUDingly awful
20. Maybe - fearware - too bloated - too simple - over default ing -
21. Maybe - fearware - too bloated - too simple - over default ing - troll your own framework
22. justrails.rb ➔ Controllers ➔ Routing ➔ Views ➔ Models
23. 1_application
24. 2_Controllers - Conventions - URL Matching - Autoloading
25. Conventions 1. <host>/products/index 2. ProductsController#index 3. products_controller 4. <app>/application/controllers
26. Autoloading - const_get - const_missing - $LOAD_PATH
27. 3_View Interface to several Ruby template engines
28. 3_View Interface to several Ruby template engines
29. 4_Methods as Rack Applications
30. 5_Routing
31. Options? ➔ Middlewares ➔ Action* , Active* ➔ Inheritance
32. References - edgeguides.rubyonrails.org/rails_on_rack.html - rebuilding-rails.com - Sinatra, Rails, Thin
33. Thank You!