Take your azure functions to the next level with durable functions @ Experts Live 2018

Slides of the presentation I gave at Experts Live 2018 in Ede about the Durable Functions extension for Azure Functions.

The source code containing all the demos (HelloWorld, Function Chaining and Fan-out/Fan-in) is located in this repo: https://github.com/marcduiker/demos-azure-durable-functions.

Transcript

2. Marc Duiker Lead Consultant @ Xpirit
3. Marc Duiker Durable Functions • Shift to Serverless • What are orchestrations? • Why do we need them? • What is Durable Functions? • Local development • Demos • Hello World / Hello Name • Function chaining • Fan-out/Fan-in • Unit Testing
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5. Marc Duiker Durable Functions IaaS PaaS SaaS FaaS + Less maintenance + Pay as you go + More fine grained scalability - Less control - More moving parts
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7. Marc Duiker Durable Functions Control flow
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9. Marc Duiker Durable Functions Orchestration? Orchestration is the automated arrangement, coordination, and management of computer systems, middleware, and services.
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17. Marc Duiker Durable Functions Durable Functions is based on
18. Marc Duiker Durable Functions Function Roles
19. Marc Duiker Durable Functions New Trigger Bindings [OrchestrationClient] DurableOrchestrationClient Function Role: Orchestration Starter
20. Marc Duiker Durable Functions DurableOrchestrationClient
21. Marc Duiker Durable Functions New Trigger Bindings [OrchestrationTrigger] DurableOrchestrationContext Function Role: Orchestration Function
22. Marc Duiker Durable Functions DurableOrchestrationContext
23. Marc Duiker Durable Functions New Trigger Bindings [ActivityTrigger] DurableActivityContext Function Role: Activity Function
24. Marc Duiker Durable Functions DurableActivityContext
25. Marc Duiker Durable Functions Invocations, Checkpoints & Replay Function invocation Execution history
26. Marc Duiker Durable Functions Storage Types used by Durable Functions
27. Marc Duiker Durable Functions State is Persisted in Table Storage
28. Marc Duiker Durable Functions Considerations when using Durable Functions - In and output of functions should be serializable. - Orchestration Functions should be deterministic: - DateTime.Now, use CurrentUtcDateTime - Guid.NewGuid() - Random generated data
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30. Marc Duiker Durable Functions Visual Studio 2017 15.7+ - “Azure development tools” workload - Extension: Azure Functions & Web Jobs Tools - Azure Storage Emulator - Azure Storage Explorer Local development
31. Marc Duiker Durable Functions Hello World Demo! HelloWorld HelloWorldActivity HttpStart
32. Marc Duiker Durable Functions Hello {name} Demo! HttpStart HelloName {name} HelloNameActivity {name}
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34. Marc Duiker Durable Functions Function chaining
35. Marc Duiker Durable Functions Demo: Function Chaining Find a Star Wars character and their home planet. https://swapi.co/
36. Marc Duiker Durable Functions Demo: Function Chaining HttpStart GetSwCharacterInfo SearchCharacter GetPlanet
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38. Marc Duiker Durable Functions Fan-out/fan-in FA1 returns a collection of items FA2 is called for each of the items from FA1
39. Marc Duiker Durable Functions Demo: Fan-out/Fan-in Find a Star Wars planet and their residents. https://swapi.co/
40. Marc Duiker Durable Functions Demo: Fan-out/Fan-in HttpStart GetSwPlanetResidents SearchPlanet GetCharacter
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42. Marc Duiker Durable Functions Unit Testing Demo Testing the GetSwPlanetAndResidentials orchestration using: • xUnit • Moq • AutoFixture
43. Marc Duiker Durable Functions Unit Testing • Use DurableOrchestrationContextBase in the orchestration. • Use serializable types with [ActivityTrigger] for the activity input. (because DurableActivityContext can’t be instantiated/mocked due to internal constructor  ).
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45. Marc Duiker Durable Functions • Orchestration Functions can only call Activity Functions in the same Function App. • Keep your orchestration small. • What changes together should be deployed together. Closing remarks
46. Marc Duiker Durable Functions GitHub: demos-azure-durable-functions blog.marcduiker.nl @marcduiker