Take your Azure Functions to the next level with Durable Functions @ Serverless Computing London 2018

Slides of my presentation for the Serverless Computing conference in London on 13 Nov 2018.

Source code for the demos is located in this repo: https://github.com/marcduiker/demos-azure-durable-functions

Transcript

2. Marc Duiker Lead Azure Consultant @ Xpirit
3. Marc Duiker Durable Functions
4. Marc Duiker Durable Functions
5. Marc Duiker Durable Functions CC BY-SA 3.0 Olga Tarkovskiy
6. Marc Duiker Durable Functions
7. Marc Duiker Durable Functions
8. Marc Duiker Durable Functions Multiple Functions & Control Flow
9. Marc Duiker Durable Functions
10. Marc Duiker Durable Functions
11. Marc Duiker Durable Functions
12. Marc Duiker Durable Functions
13. Marc Duiker Durable Functions
14. Marc Duiker Durable Functions
15. Marc Duiker Durable Functions
16. Marc Duiker Durable Functions Durable Functions is based on
17. Marc Duiker Durable Functions Function Roles
18. Marc Duiker Durable Functions Invocations, Checkpoints & Replay
19. Marc Duiker Durable Functions Storage Types used by Durable Functions
20. Marc Duiker Durable Functions State is Persisted in Table Storage
21. Marc Duiker Durable Functions New Trigger Bindings [OrchestrationClient] DurableOrchestrationClient(Base) Function Role: Orchestration Client (Starter Function)
22. Marc Duiker Durable Functions DurableOrchestrationClient
23. Marc Duiker Durable Functions New Trigger Bindings [OrchestrationTrigger] DurableOrchestrationContext(Base) Function Role: Orchestration Function
24. Marc Duiker Durable Functions DurableOrchestrationContext
25. Marc Duiker Durable Functions New Trigger Bindings [ActivityTrigger] DurableActivityContext Function Role: Activity Function
26. Marc Duiker Durable Functions DurableActivityContext
27. Marc Duiker Durable Functions
28. Marc Duiker Durable Functions • Visual Studio 2017 15.7+ • Azure Workload - Extension: Azure Functions & Web Jobs Tools - Azure Storage Emulator - Microsoft.Azure.Webjobs.Extensions.DurableTask Local development with VS2017
29. Marc Duiker Durable Functions Hello {name} Demo! HttpStart HelloName {name} HelloNameActivity {name}
30. Marc Duiker Durable Functions
31. Marc Duiker Durable Functions Function chaining
32. Marc Duiker Durable Functions Demo: Function Chaining Find a Star Wars character and their home planet. https://swapi.co/
33. Marc Duiker Durable Functions Demo: Function Chaining HttpStart GetPlanet GetCharacterInfo SearchCharacter
34. Marc Duiker Durable Functions
35. Marc Duiker Durable Functions Fan-out/fan-in FA1 returns a collection of items FA2 is called for each of the items from FA1
36. Marc Duiker Durable Functions Demo: Fan-out/Fan-in Find a Star Wars planet and their residents. https://swapi.co/
37. Marc Duiker Durable Functions Demo: Fan-out/Fan-in HttpStart GetCharacter GetPlanetResidents SearchPlanet
38. Marc Duiker Durable Functions
39. Marc Duiker Durable Functions Unit Testing Demo Testing the GetPlanetResidents orchestration using: • xUnit • Moq • AutoFixture • FluentAssertions
40. Marc Duiker Durable Functions Unit Testing • Use the context base classes. • Use simple or complex (serializable) types with [ActivityTrigger] for the activity input. • Because DurableActivityContext can’t be instantiated/mocked due to internal constructor .
41. Marc Duiker Durable Functions
42. Marc Duiker Durable Functions • In and output of functions should be serializable. • Orchestration Functions should be deterministic: - DateTime.Now, use CurrentUtcDateTime - Guid.NewGuid() - Random generated data Closing remarks I
43. Marc Duiker Durable Functions • Orchestration Functions can only call Activity Functions in the same Function App. • Keep your orchestrations small. • What changes together should be deployed together. Closing remarks II
44. Marc Duiker Durable Functions GitHub: demos-azure-durable-functions mduiker@xpirit.com blog.marcduiker.nl @marcduiker