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

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Slides of my presentation for Serverless Computing London at 13 Nov 2018. Source code for the demos is located in this repo: https://github.com/marcduiker/demos-azure-durable-functions

Technologie

Marc Duiker
Lead Azure Consultant @ Xpirit

Marc Duiker
Durable Functions
CC BY-SA 3.0 Olga Tarkovskiy

Marc Duiker
Durable Functions
Multiple Functions & Control Flow

Marc Duiker
Durable Functions
Durable Functions is based on

Marc Duiker
Durable Functions
Function Roles

Marc Duiker
Durable Functions
Invocations, Checkpoints & Replay

Marc Duiker
Durable Functions
Storage Types used by Durable Functions

Marc Duiker
Durable Functions
State is Persisted in Table Storage

Marc Duiker
Durable Functions
New Trigger Bindings
[OrchestrationClient] DurableOrchestrationClient(Base)
Function Role: Orchestration Client
(Starter Function)

Marc Duiker
Durable Functions
DurableOrchestrationClient

Marc Duiker
Durable Functions
New Trigger Bindings
[OrchestrationTrigger] DurableOrchestrationContext(Base)
Function Role: Orchestration Function

Marc Duiker
Durable Functions
DurableOrchestrationContext

Marc Duiker
Durable Functions
New Trigger Bindings
[ActivityTrigger] DurableActivityContext
Function Role: Activity Function

Marc Duiker
Durable Functions
DurableActivityContext

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

Marc Duiker
Durable Functions
Hello {name} Demo!
HttpStart HelloName
{name}
HelloNameActivity
{name}

Marc Duiker
Durable Functions
Function chaining

Marc Duiker
Durable Functions
Demo: Function Chaining
Find a Star Wars character and their home planet.
https://swapi.co/

Marc Duiker
Durable Functions
Demo: Function Chaining
HttpStart GetPlanetGetCharacterInfo SearchCharacter

Marc Duiker
Durable Functions
Fan-out/fan-in
FA1 returns a collection of items
FA2 is called for each of the items from FA1

Marc Duiker
Durable Functions
Demo: Fan-out/Fan-in
Find a Star Wars planet and their residents.
https://swapi.co/

Marc Duiker
Durable Functions
Demo: Fan-out/Fan-in
HttpStart GetCharacterGetPlanetResidents SearchPlanet

Marc Duiker
Durable Functions
Unit Testing Demo
Testing the GetPlanetResidents orchestration using:
• xUnit
• Moq
• AutoFixture
• FluentAssertions

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 .

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

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

Marc Duiker
Durable Functions
GitHub: demos-azure-durable-functions
mduiker@xpirit.com
blog.marcduiker.nl
@marcduiker

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

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 GetPlanetGetCharacterInfo 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 GetCharacterGetPlanetResidents 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

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

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