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

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Marc Duiker Lead Consultant @ Xpirit

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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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Marc Duiker Durable Functions

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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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Marc Duiker Durable Functions

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Marc Duiker Durable Functions Control flow

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions Orchestration? Orchestration is the automated arrangement, coordination, and management of computer systems, middleware, and services.

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions Durable Functions is based on

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Marc Duiker Durable Functions Function Roles

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

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Marc Duiker Durable Functions DurableOrchestrationClient

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

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Marc Duiker Durable Functions DurableOrchestrationContext

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

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Marc Duiker Durable Functions DurableActivityContext

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Marc Duiker Durable Functions Invocations, Checkpoints & Replay Function invocation Execution history

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Marc Duiker Durable Functions Storage Types used by Durable Functions

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Marc Duiker Durable Functions State is Persisted in Table Storage

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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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Marc Duiker Durable Functions

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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

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Marc Duiker Durable Functions Hello World Demo! HelloWorld HelloWorldActivity HttpStart

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

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Marc Duiker Durable Functions

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Marc Duiker Durable Functions Function chaining

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

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Marc Duiker Durable Functions Demo: Function Chaining HttpStart GetSwCharacterInfo SearchCharacter GetPlanet

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Marc Duiker Durable Functions

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

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

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

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Marc Duiker Durable Functions

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

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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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Marc Duiker Durable Functions

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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

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