NDC Oslo 2021 - Developer Fundamentals of Serverless .NET Development of Azure Durable Functions

Jonah Andresson's speaker deck and presentation copy at the NDC Oslo 2021, session titled "Developer Fundamentals of Serverless.NET Development with Azure Durable Functions"

https://ndcoslo.com/agenda/developer-fundamentals-of-serverlessnet-development-with-azure-durable-functions-0ofz/0kyo3pv2spp

About Session:
Learn more about how you can get started in developing stateful functions with Microsoft Azure Durable Functions in a serverless environment in .NET. Find out the fundamental concepts you need to know to get started coding serverless in Azure, Durable Function Patterns, a few code samples and some recommended learning

About Jonah Andersson:

Jonah Andersson is a Filipina-Swedish full-stack Software Engineer, Azure Developer and Microsoft Azure MVP in Sweden.

She works as an Enterprise Software Engineer Consultant at Forefront Consulting in Sweden. She is also the founder and community leader of Azure User Group Sweden. Jonah studied Computer Science and Agile System Development in .NET and Java, which makes her very passionate about tech. She likes solving challenging problems, programming back-end and has great interest in developing in .NET with new cloud technologies in Microsoft Azure. She believes in continuous learning and collaboration with developers. Sharing technical knowledge at work and to the tech communities through public speaking and by mentoring others. Jonah is also passionate about making a difference by advocating gender equality, diversity and inclusion in tech.

Twitter: https://www.twitter.com/cjkodare
LinkedIn: https://www.linkedin.com/in/jonahandersson
Blog: https://jonahandersson.tech
Azure User Group Sweden: https://www.meetup.com/azureusergroupsundsvallsverige/

Transcript

1. Jonah Andersson Developer Fundamentals of Serverless .NET Development with Azure Durable Functions 2021-12-01
2. Hi, I’m Jonah Andersson! ☺ ▪ Software Engineer/Developer ▪ Full stack .NET ▪ Certified Azure Developer ▪ Microsoft MVP – Azure ▪ Microsoft Technical Trainer ▪ Founder/Community Leader of Azure User Group Sweden ▪ I mentor to inspire others into tech!
3. Jonah – Offline Version
4. Serverless Azure Functions Durable Functions Application Patterns Demo/Examples Learning Resources
5. 5 Scenario: 5 Philosophers, 5 Chopsticks A philosopher needs both Chopsticks - on left and right to eat. Otherwise, he/she can’t The Dining Philosophers Problem PROBLEMS: • Deadlock • Starvation
6. 6 Have you been deadlocked? A deadlock is a condition where a program cannot access a resource it needs to continue. When an active application hits a deadlock, it may "hang" or become unresponsive. https://techterms.com/definition/deadlock
7. 7 CONCURRENCY DEADLOCK RACING CONDITIONS
8. What is really Serverless? Abstraction of servers and infrastructures Break logic into functions Focus on developer productivity Autoscaling Great integration Consumption model (Pay-as-You-Go) Automation of processes
9. Serverless Sweet Swedish “Fika” Comparison CONTROL PRODUCTIVITY MONOLITH SERVERLESS MICROSERVICES CONTAINERIZATION
10. Azure Functions Azure Serverless Compute Service On-Demand , Pay-as-you-Go Event-Driven Focus on logic = Developer productivity Integration with other services & APIs Azure Functions
11. Azure Durable Functions Extension of Azure Functions Stateful Workflows in Serverless Environments Manages, Checkpoints and Restarts State for you Durable Task Framework https://github.com/Azure/durabletask C#, Javascript, Python, F#, Powershell
12. Azure Functions Azure Durable Functions STATELESS STATEFUL
13. Orchestrator Functions Client Functions Activity Functions Durable Function Types Entity Functions
14. The Orchestrator is our FRIEND but STRICT! More info about Deterministic APIs: https://docs.microsoft.com/en-us/azure/azure- functions/durable/durable-functions-code- constraints#using-deterministic-apis DETERMINISTIC!
15. With Determined Orchestrator No Orchestrator
16. Orchestrator Code Constraints – DONTs & DOs Dont generate random numbers or GUIDs NewGuid() method Dont access data stores like databases and configurations Blocking APIs - Threads like Sleep, Run or Delay Dont create Infinite Loops! CreateAsNew() Pass configurations into Activity function Use DurableOrchestrationContext Dont use CurrentDateTime Use.CurrentUtcDateTime() https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-code-constraints
17. Application Patterns of Azure Durable Functions Function Chaining Fan out / Fan in Async HTTP API Monitor Human Interaction Aggregator
18. Function Chaining Pattern F1 F2 F4 F3 Execute a sequence of functions in a particular order like a chain! Output of F1 is required input of F2, so on!
19. Orchestrator STARTED Activity 1 SCHEDULED Orchestrator SLEEPS! Activity 1 DONE Orchestrator WAKES UP! Activity 2 SCHEDULED Activity 2 DONE Orchestration COMPLETED Orchestrator SLEEPS! Function Chaining in ACTION!
20. The Orchestrator can be a sleepyhead but it is GOOD!
22. Fan Out / Fan In Pattern Execute multiple functions in parallel and then wait for all functions to finish and aggregate the results when done.
23. E2_BackupSiteContent orchestrator function
24. Async HTTP APIs Pattern Start DoWork GetStatus Solves the problem of coordinating the state of long-running operations with external clients Use HTTP Endpoint trigger the long running action Redirect a client to a status endpoint
25. Async HTTP APIs Pattern
26. Monitor Pattern ▪ Flexible, recurring process in a workflow ▪ Polling until specific conditions are met ▪ Use Case: Periodic job clean up
27. Monitor Pattern
28. Human Interaction Pattern Requests Approval ProcessApproval Escalate Automate business processes that requires human interaction
29. Approval Workflow Example
30. Aggregator (Stateful Entities) Aggregating event data over a period of time into a single addressable entity.
31. Aggregator (Stateful Entities) https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-entities
32. Sub-Orchestrations in Durable Functions Sub-Orchestration in Orchestration Supported .NET, Javascript, Python
33. Sub-Orchestration in Code
34. Developing Azure Functions Visual Studio or VS Code Azure Portal, Azure CLI Azure Functions Core Tools https://github.com/Azure/azure-functions-core-tools A client for web requests like a web browser or Postman Azure Storage Explorer (Local Dev) Supported Languages C#, Java, Powershell, Python, Typescript, etc.
35. Fullstack Development with Azure Functions Azure Static Web Apps – React, Blazor, Vue.js, etc. API support – Azure Static Web Apps with Azure Functions Bring Your Own Functions
36. Orchestration Details https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-instance-management
37. Coding Durable Functions – Good to know & have! Azure Application Insights Concious Versioning Side-by-Side Deployment Deployment with Breaking Change Azure Storage Explorer Deployment Slots Azure Key Vault / Configurations https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-versioning
38. Error Handling – FunctionFailedException() Call another function activity Use Automatic Retry on Failure – CallActivityWithRetryAsync() Try-Catch Blocks https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-error-handling Durable Timer ( context.CreateTimer()) .NET App Logging / Application Insights Durable Functions Monitor https://github.com/scale-tone/DurableFunctionsMonitor#durable-functions-monitor
39. Automatic Retry
40. Try – Catch
41. https://docs.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-unit-testing Unit Testing
42. Deployment & CI /CD Azure Function App (Windows + Linux) Azure Function App Container Azure Container Registry GitHub Actions/Workflow ARM Templates PubXml
43. Azure Container Apps (Preview) MS Docs: https://docs.microsoft.com/en-us/azure/container-apps/ Fully managed serverless container service Built for Microservices scales dynamically based on HTTP traffic, events, and long- running background jobs Full support for KEDA and DAPR
44. https://azure.microsoft.com/en-us/updates/generally-available-azure-functions-runtime-40/
45. Use Case: Serverless Power for Azure’s Cloud Security https://www.microsoft.com/security/blog/2021/08/19/automating-security-assessments-using-cloud-katana/ https://cloud-katana.com/ By Roberto Rodriguez https://github.com/Azure/Cloud-Katana
46. Demo - Serverless Function Chaining Example F1 F2 F3 Azure BLOB Trigger Orchestrator Function Starts Orchestration SendMessageToServiceBus() SendSMSCallviaTwilio() SendNotificationEmail() https://github.com/jonahandersson/serverlesslab-azure-durable-functionchaining-template
47. Expected Results
48. Learning Resources • http://aka.ms/azurefunctions • Microsoft Learn – Azure Functions • Get updates via Twitter @AzureFunctions • Azure Functions University by Marc Duiker https://bit.ly/az-func-uni-playlist (YouTube) https://bit.ly/az-func-uni (GitHub) • https://github.com/Azure/azure-functions-durable-extension • Azure Serverless Community Library https://www.serverlesslibrary.net/
49. https://www.meetup.com/azureusergroupsundsvallsverige For the community, by the community!
50. As a developer, I Serverless because I can solve complex problems, build modern apps and it makes me productive!
51. Tack så mycket! Thanks! https://www.jonahandersson.tech https://linkedin.com/in/jonahandersson @cjkodare