https://github.com/nishantmodak/chotu https://github.com/nishantmodak/ruby-talk-au/ ( 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.

1. RACK
a framework to t roll your own
Revealing Hour Creations
@nishantmodak
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. What is Rack?
SERVER
SERVER
APPLICATION /
FRAMEWORK

5. What is Rack?
1. Web Server Interface
2. Tool for composing web applications
3. Collection of middleware utilities

6. RACK

7. config.ru
$ rackup

8. Middleware
HTTP
INTERMEDIARIES
APP

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. SERVER
MIDDLEWARE
MIDDLEWARE
FRAMEWORK
MIDDLEWARE
ROUTING
MIDDLEWARE
APPLICATION
APPLICATION

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!