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
2. Once upon a time A computer tale
3. - Disclaimer « Any resemblance to actual events, to persons living or dead, is not the result of chance. It is DELIBERATE »
4. In a little company…
5. A developer
6. A tester
7. A DevOps
8. A product owner
9. Worked together in harmony
10. Little project grew up
11. And each change became more urgent than the precedent
12. If I have to change anything on this project I will kill myself
13. If I have to play the whole test suite once again, I’m good for another therapy
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
15. Conflicts emerged
16. Resulting in a mess
17. As the fear grew, the release rhythm slowed down
18. Which only made the fear of change grew stronger
19. We’re all humans
20. -Tony Robbins « By changing nothing, nothing changes. »
21. WHY? • Monolith • Hard to change • Inertia for refactoring / improvement • « Container carrier » size
22. FROM MONOLITH…
23. TO MICROSERVICES
24. MICROSERVICES • Small isolated cooperative units • Aim to reduce: • FEAR OF CHANGE • Complexity • Inertia
25. EXAMPLE User management service
26. SMALL Simple composant Easy to understand Easy to maintain Fit in the head
27. SINGLE RESPONSIBILITY Do one thing Do it well Single source of truth Unix way
28. BLACK-BOX Expose a contract What it does What it returns And the format
29. ISOLATION Communicate over
 Network No data leak through layers
30. SCALING Easier to scale IF STATELESS
31. BEST LANGUAGE Choose the best tool And change it later
32. BEST DATASTORE Polyglot persistence Easier to change
33. MORE DETAILED PRESENTATION ABOUT MICRO SERVICES • https://speakerdeck.com/lothiraldan/ microservices-introduction
34. DESIGN Communication
35. DISCOVERY Discovery Communication
36. DATA-BACKEND Discovery Data-backend Communication
37. INTERFACES HTTP Interface Websocket Interface Other interface Discovery Data-backend Communication
38. INTERFACES µService HTTP Interface Websocket Interface Other interface Discovery Data-backend Communication
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
40. RESOURCE-ORIENTED • REST without HTTP • One and unique way to do CRUD operation • Valuable when combined with broadcasted changes
41. REST API • Bind your endpoints to your code • What about websocket API? • Or IRC?
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()
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()
44. DEMO TIME!
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.
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()
47. RESULT
48. EXPOSED VIA WEBSOCKET • Changes exposed via real-time endpoint (websocket, etc…) • Easy to consume as REST-oriented • Works great with React / Flux
49. CONCLUSION • Give it a try! • https://github.com/Lothiraldan/ZeroServices • Let’s sprint on it!