Microservices késako

What is a microservices? A tale of computer company. A presentation of micro-services and how to create them with ZeroServices, a python micro-services framework.

Transcript

1. MICROSERVICE KÉSAKO
   BORIS FELD - PYCONFR 2015
   

   View Slide

2. Once upon a time
   A computer tale
   

   View Slide

3. - Disclaimer
   « Any resemblance to actual events, to persons living or dead,
   is not the result of chance. It is DELIBERATE »
   

   View Slide

4. In a little company…
   

   View Slide

5. A developer
   

   View Slide

6. A tester
   

   View Slide

7. A DevOps
   

   View Slide

8. A product owner
   

   View Slide

9. Worked together in harmony
   

   View Slide

10. Little project grew up
    

    View Slide

11. And each change became more urgent than the
    precedent
    

    View Slide

12. If I have to change anything on this project I will kill
    myself
    

    View Slide

13. If I have to play the whole test suite once again, I’m
    good for another therapy
    

    View Slide

14. If I have to deploy this project and maintain it, I will
    be able to buy a new car with the on-cull duty
    

    View Slide

15. Conflicts emerged
    

    View Slide

16. Resulting in a mess
    

    View Slide

17. As the fear grew, the release rhythm slowed down
    

    View Slide

18. Which only made the fear of change grew stronger
    

    View Slide

19. We’re all humans
    

    View Slide

20. -Tony Robbins
    « By changing nothing, nothing changes. »
    

    View Slide

21. WHY?
    • Monolith
    • Hard to change
    • Inertia for refactoring / improvement
    • « Container carrier » size
    

    View Slide

22. FROM MONOLITH…
    

    View Slide

23. TO MICROSERVICES
    

    View Slide

24. MICROSERVICES
    • Small isolated cooperative units
    • Aim to reduce:
    • FEAR OF CHANGE
    • Complexity
    • Inertia
    

    View Slide

25. EXAMPLE
    User management service
    

    View Slide

26. SMALL
    Simple composant Easy to understand
    Easy to maintain
    Fit in the head
    

    View Slide

27. SINGLE RESPONSIBILITY
    Do one thing Do it well
    Single source of truth
    Unix way
    

    View Slide

28. BLACK-BOX
    Expose a contract What it does
    What it returns And the format
    

    View Slide

29. ISOLATION
    Communicate over

    Network
    No data leak through
    layers
    

    View Slide

30. SCALING
    Easier to scale IF STATELESS
    

    View Slide

31. BEST LANGUAGE
    Choose the best tool And change it later
    

    View Slide

32. BEST DATASTORE
    Polyglot persistence Easier to change
    

    View Slide

33. MORE DETAILED PRESENTATION
    ABOUT MICRO SERVICES
    • https://speakerdeck.com/lothiraldan/
    microservices-introduction
    

    View Slide

34. DESIGN
    Communication
    

    View Slide

35. DISCOVERY
    Discovery
    Communication
    

    View Slide

36. DATA-BACKEND
    Discovery
    Data-backend Communication
    

    View Slide

37. INTERFACES
    HTTP Interface
    Websocket
    Interface
    Other interface
    Discovery
    Data-backend Communication
    

    View Slide

38. INTERFACES
    µService
    HTTP Interface
    Websocket
    Interface
    Other interface
    Discovery
    Data-backend Communication
    

    View Slide

39. ZEROSERVICES
    • A framework for all theses bricks
    • And a reference implementation for all of them
    • Python 3.4
    • Asynchronous / Asyncio
    • Changes are broadcasted as events
    

    View Slide

40. RESOURCE-ORIENTED
    • REST without HTTP
    • One and unique way to do CRUD operation
    • Valuable when combined with broadcasted
    changes
    

    View Slide

41. REST API
    • Bind your endpoints to your code
    • What about websocket API?
    • Or IRC?
    

    View Slide

42. WHAT IT LOOKS LIKE?
    RESOURCE SERVICE
    loop = asyncio.get_event_loop()
    medium = ZeroMQMedium(loop, UdpDiscoveryMedium)
    service = ResourceService('power_service', medium)
    service.register_resource(MongoDBCollection("power", "db"))
    loop.run_until_complete(todo.start())
    loop.run_forever()
    

    View Slide

43. REAL-TIME REST API
    loop = asyncio.get_event_loop()
    medium = ZeroMQMedium(loop,
    UdpDiscoveryMedium)
    service = ResourceService('rest_api', medium)
    application = get_http_interface(service, loop,
    port=5001,
    allowed_origins="*")
    application = loop.run_until_complete(application)
    loop.run_until_complete(service.start())
    loop.run_forever()
    

    View Slide

44. DEMO TIME!
    

    View Slide

45. PROBLEMS WITH MICRO-
    SERVICES
    • Micro-service needs to know where are the others.
    • Made testing difficult.
    • Framework should abstract that.
    • Start without DevOps burdens.
    

    View Slide

46. COMBINED
    loop = asyncio.get_event_loop()
    medium = ZeroMQMedium(loop, UdpDiscoveryMedium)
    service = ResourceService('power_service', medium)
    service.register_resource(MongoDBCollection("power", "db"))
    application = get_http_interface(service, loop, port=5001,
    allowed_origins="*")
    application = loop.run_until_complete(application)
    loop.run_until_complete(todo.start())
    loop.run_forever()
    

    View Slide

47. RESULT
    

    View Slide

48. EXPOSED VIA WEBSOCKET
    • Changes exposed via real-time endpoint
    (websocket, etc…)
    • Easy to consume as REST-oriented
    • Works great with React / Flux
    

    View Slide

49. CONCLUSION
    • Give it a try!
    • https://github.com/Lothiraldan/ZeroServices
    • Let’s sprint on it!
    

    View Slide