or how we built letitcast.com

1. Service Oriented
Applications
How we built letitcast.com, Ruby Lugdunum, June 26, 2011
Michael Bensoussan
Developer

2. Service Oriented
Applications
cc @elise_huard
How we built letitcast.com, Ruby Lugdunum, June 26, 2011
Michael Bensoussan
Developer

3. Service Oriented
Applications
How we built letitcast.com, Ruby Lugdunum, June 26, 2011
Monolithic
applications are
boooring !
cc @apotonick
Michael Bensoussan
Developer

5. Tons of

7. It was a

8. MySQL
Front-end

9. Redis MySQL
API for FTP
Rails API users and dir.
(sinatra)
Configs
Engine
video uploaded
Client Library on FTP notifier
(sinatra)
Rails Rails
Frontend 1 Frontend 2
Rails
Frontend 3
Configs Auth
Engine Engine

10. What did we

11. Scale With Code
Complexity

12. Scale With Team Size

13. Monolithic applications don’t
scale

14. Let’s build an API and
multiple Front-ends

15. Choose a communication
layer
and a serialization format

16. We choose HTTP

17. We choose HTTP and
JSON

18. Build the
API !

19. Tip: don’t load the
rails libs you don’t
need

20. require "rails/all"

21. # Pick the frameworks you want:
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
# require "active_resource/railtie"
require "rails/test_unit/railtie"

22. [
ActionDispatch::Flash,
ActionDispatch::Session::CookieStore,
ActionDispatch::Cookies,
ActionDispatch::Static
].each do |klass|
config.middleware.delete klass
end

23. Tip: Build the API
response

24. fabrik42 / acts_as_api

25. class User < ActiveRecord::Base
acts_as_api
api_accessible(ApiAccessible.init(:user))
def name
"#{user.firstname} #{user.lastname}"
end
end

26. :user:
:default:
- :id
- :name
:full:
- :id
- :name
- :birthday
- :created_at
- :updated_at

27. def show
user = User.find(params[:id])
render_for_api :full, :json => user
end

28. MySQL
Rails API

29. Build your Client
Library

30. citizencast / restparty

31. class Casting < LetitCastClient
resource_for :castings, :except => [:delete],
:association => [:parts, :productions],
:member => {
:add_production => :post,
:remove_production => :delete
},
:collection => {:search => :get}
end
Casting.find(:all) # GET /castings.json
casting = Casting.find(42) # GET /castings/42.json
parts = casting.parts # GET /castings/42/parts.json
Casting.delete(1) # DEL /castings/1
Casting.search(:q => "Mike") # GET /castings/search?q=Mike

32. class Casting < LetitCastClient
resource_for :castings, :except => [:delete],
:association => [:parts, :productions],
:member => {
:add_production => :post,
:remove_production => :delete
},
:collection => {:search => :get}
end
Casting.find(:all) # GET /castings.json
casting = Casting.find(42) # GET /castings/42.json
parts = casting.parts # GET /castings/42/parts.json
Casting.delete(1) # DEL /castings/1
Casting.search(:q => "Mike") # GET /castings/search?q=Mike

33. MySQL
Rails API
Client Library
Rails
Frontend 1

34. MySQL
Rails API
Client Library
Rails Rails
Frontend 1 Frontend 2

35. Rails Engines !

36. Rails 3 Rails 3.1
gem install enginex
rails plugin new auth --full
enginex auth

37. Rails 3 Rails 3.1
gem install enginex
rails plugin new auth --full
enginex auth

38. MySQL
Rails API
Client Library
Rails Rails
Frontend 1 Frontend 2
Configs Auth
Engine Engine

39. HTTP is slow !

40. Cache !

41. jodosha / redis-store

42. Redis
Cache Invalidate
HTTP calls Cache
Frontends Rails API

43. def show
@casting = Rails.cache.fetch("controller/castings/#{params[:id]}") do
Casting.find(params[:id])
end
end

44. class CastingSweeper < ActionController::Caching::Sweeper
observe Casting
def after_save(casting)
Rails.cache.delete_matched("controller/castings/index*")
Rails.cache.delete_matched("controller/castings/
#{casting.id}*")
end
end

45. Redis MySQL
Rails API
Client Library
Rails Rails
Frontend 1 Frontend 2
Configs Auth
Engine Engine

46. Redis MySQL
API for FTP
Rails API users and dir.
(sinatra)
Configs
Engine
video uploaded
Client Library on FTP notifier
(sinatra)
Rails Rails
Frontend 1 Frontend 2
Rails
Frontend 3
Configs Auth
Engine Engine

47. Questions
?