The slides from my presentation to RubyIreland

1. Taming Monolithic Monsters
@gavinjoyce

2. Need help building
something ambitious?
gavinjoyce@gmail.com

3. What’s the Problem?

4. What’s the Problem?
● Rails apps don’t scale

5. What’s the Problem?
● Rails apps don’t scale
● Rails apps do scale:

6. What’s the Problem?
● Rails apps don’t scale
● Rails apps do scale:
○ Web servers are cheap

7. What’s the Problem?
● Rails apps don’t scale
● Rails apps do scale:
○ Web servers are cheap
○ Engineers are expensive

8. What’s the Problem?
● Rails apps don’t scale
● Rails apps do scale:
○ Web servers are cheap
○ Engineers are expensive
○ Rails is optimised to save engineering time

9. What’s the Problem?
● Rails apps don’t scale
● Rails apps do scale:
○ Web servers are cheap
○ Engineers are expensive
○ Rails is optimised to save engineering time
○ not the full story...

10. What’s the Problem?
In my experience:
● Large rails apps are hard to scale

11. What’s the Problem?
In my experience:
● Large rails apps are hard to scale:
○ Team size

12. What’s the Problem?
In my experience:
● Large rails apps are hard to scale:
○ Team size
■ code base complexity

13. What’s the Problem?
In my experience:
● Large rails apps are hard to scale:
○ Team size
■ code base complexity
■ brittleness due to tight coupling between
models

14. What’s the Problem?
In my experience:
● Large rails apps are hard to scale:
○ Team size
■ code base complexity
■ brittleness due to tight coupling between
models
○ TDD feedback time

15. Mutations Gem
github.com/cypriss/mutations

16. Mutations Gem
github.com/cypriss/mutations
● Compose your business logic into
commands that sanitize and validate input

17. Mutations Gem
github.com/cypriss/mutations
● Compose your business logic into
commands that sanitize and validate input
● Write safe, reusable, and maintainable
code for Ruby and Rails apps

18. Defining a Mutations Command

19. Using a Mutations Command

20. demo - simple mutation command

21. Mutations in your app

22. Mutations in your app
● create an internal api

23. Mutations in your app
● create an internal api
○ logically isolate key business logic

24. Mutations in RestPack

25. Mutations in RestPack
https://github.com/restpack

26. Mutations in RestPack

27. Mutations in RestPack
● Services are packaged as gems

28. Mutations in RestPack
● Services are packaged as gems:
○ Commands

29. Mutations in RestPack
● Services are packaged as gems:
○ Commands
○ Serialisers

30. Mutations in RestPack
● Services are packaged as gems:
○ Commands
○ Serialisers
○ Models

31. Mutations in RestPack
● Services are packaged as gems:
○ Commands
○ Serialisers
○ Models
○ Migrations

32. Mutations in RestPack
● Services are packaged as gems:
○ Commands
○ Serialisers
○ Models
○ Migrations
○ Specs

33. Mutations in RestPack
● Services are packaged as gems:
○ Commands
○ Serialisers
○ Models
○ Migrations
○ Specs
● Commands are the public interface

34. Mutations in RestPack
● Services are packaged as gems:
○ Commands
○ Serialisers
○ Models
○ Migrations
○ Specs
● Commands are the public interface
○ either Ruby or REST

35. RestPack Service Gem Anatomy

36. RestPack Service Gem Anatomy
DB

37. RestPack Service Gem Anatomy
rake restpack:migrate
DB

38. RestPack Service Gem Anatomy
models
rake restpack:migrate
DB

39. RestPack Service Gem Anatomy
models
ActiveRecord models
rake restpack:migrate
DB

40. RestPack Service Gem Anatomy
serialisers
models
ActiveRecord models
rake restpack:migrate
DB

41. RestPack Service Gem Anatomy
serialisers
RestPack::Serializer gem
models
ActiveRecord models
rake restpack:migrate
DB

42. RestPack Service Gem Anatomy
commands
serialisers
RestPack::Serializer gem
models
ActiveRecord models
rake restpack:migrate
DB

43. RestPack Service Gem Anatomy
commands
Mutations gem
serialisers
RestPack::Serializer gem
models
ActiveRecord models
rake restpack:migrate
DB

44. RestPack Service Gem Anatomy
code demo - restpack_activity_service
https://github.com/RestPack/restpack_activity_service

45. Using service gems from Rails
A first attempt….

46. Activity Service Gem
DB

47. actv.io rails app
Activity Controller
Host Ruby Application
Activity Service Gem
DB

48. actv.io rails app
Activity Controller
Host Ruby Application
Activity Clent Gem
Activity Service Gem
DB

49. actv.io rails app
Activity Controller
Activity Model
Host Ruby Application
Activity Clent Gem
Activity Service Gem
DB

50. actv.io rails app
Activity Controller
Activity Model
Host Ruby Application
Activity Clent Gem
Local Proxy
Activity Service Gem
DB

51. actv.io rails app
Host Ruby Application
Activity Controller
Activity Model
Local Proxy
Activity Clent Gem
API Proxy
REST
API
Activity Service Gem
DB

52. demo - Rails App

53. actv.io rails app
Host Ruby Application
Activity Controller
Activity Model
Local Proxy
Activity Clent Gem
API Proxy
REST
API
Activity Service Gem
DB

54. No need for Rails, the API is
the server application
API

55. No need for Rails, the API is
the server application
Android App
API

56. No need for Rails, the API is
the server application
Android App
iOS App
API

57. No need for Rails, the API is
the server application
Web App
Android App
iOS App
API

58. No need for Rails, the API is
the server application
Web App
Android App
iOS App
API
... App
... App
... App

59. api.restpack.org

60. api.restpack.org
DB
Core

61. api.restpack.org
DB
DB
Core
Users

62. api.restpack.org
DB
DB
DB
Core
Users
Groups

63. api.restpack.org
DB
DB
DB
DB
Core
Users
Groups
Account

64. api.restpack.org
Job
Q
DB
DB
DB
DB
DB
Core
Users
Groups
Account
Email
Redis

65. Apply Security Policy
api.restpack.org
Job
Q
DB
DB
DB
DB
DB
Core
Users
Groups
Account
Email
Redis

66. dashboard.restpack.org
Apply Security Policy
api.restpack.org
Job
Q
DB
DB
DB
DB
DB
Core
Users
Groups
Account
Email
Redis

67. 3rd Party Applications
3rd Party Applications
3rd Party Applications
3rd Party Applications
dashboard.restpack.org
Apply Security Policy
api.restpack.org
Job
Q
DB
DB
DB
DB
DB
Core
Users
Groups
Account
Email
Redis

68. demo - Ember.js App

69. 1 Application, 1 DB
dashboard.restpack.org
api.restpack.org
Job
Q
DB
Redis

70. Many Applications, Many DBs
dashboard.restpack.org
Apply Security Policy
api.restpack.org
API
API
API
API
API
Job
Q
DB
DB
DB
DB
DB
Core
Users
Groups
Account
Email
Redis

71. Questions?
@gavinjoyce
github.com/RestPack