The art of Azure Functions (unit) testing and monitoring
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The document discusses the importance of unit testing and monitoring for Azure Functions, emphasizing the need to make them testable through dependency injection. It explains how to use mock objects and provides guidance on monitoring function performance with Azure Application Insights. Additionally, it outlines the pricing model based on resource consumption and execution frequency for Azure Functions.
The art of Azure Functions (unit) testing and monitoring
- 1. #PitchOnline presents: #PitchOnline presents: Massimo Bonanni Paranormal Trainer, with the head in the Cloud and all the REST in microservices! [email protected] @massimobonanni
- 2. Scifoni Ivano Fabio Mannis Francesco Del Re Matteo Riccardi Valerio Benedetti The art of Azure Functions (unit) testing and monitoring!
- 3. The issue…. If you want to use Azure Functions as components of your Enterprise solutions, you must test and monitor them!!!
- 4. What are Azure Functions Author functions in C#, F#, Node.JS, Java, Powershell, and more Code Events React to timers, HTTP , or events from your favorite Azure services, with more on the way Outputs Send results to an ever-growing collection of services The art of Azure Functions (unit) testing and monitoring!
- 5. What is a Unit Test In a unit test you invoke a piece of your code with a set of parameters and you checks the correctness its behavior. In a unit test you must substitute all your external reference with a mock or stub. Mock is for the software what a dummy is for a car crash test (you don’t test a car with a human being inside…I Hope!!) The art of Azure Functions (unit) testing and monitoring!
- 6. Azure Functions Dependencies You should implement your Azure Functions to allow you to use mock/stub for all external reference! Your Function Trigger Binding Binding Binding Binding Your Service Your Service Your Service Your Service Logger (infrastructure) The art of Azure Functions (unit) testing and monitoring!
- 7. Azure Function … untestable!! The art of Azure Functions (unit) testing and monitoring!
- 8. Azure Function … trigger!! Trigger You can mock it because the trigger payload is a POCO class The art of Azure Functions (unit) testing and monitoring!
- 9. Azure Function … bindings!! Binding You can mock it because the binding payload is an interface The art of Azure Functions (unit) testing and monitoring!
- 10. Azure Function … logger!! Logger (infrastructural objects) You can mock it because the logger is an interface The art of Azure Functions (unit) testing and monitoring!
- 11. Azure Function … your service!! External service You cannot substitute it with your mock because it is created inside the Azure Function and you haven’t a way to substitute it The art of Azure Functions (unit) testing and monitoring!
- 12. Make your Azure Function testable!!! The solution of your problem is: Dependency Injection !! Azure Functions Runtime is based on .NET Core. Azure Functions support the same ASP.NET Core Dependency Injection!!! Using Dependency Injection you provide a way to substitute your Services with a mock! The art of Azure Functions (unit) testing and monitoring!
- 13. Azure Function … testable!! Constructor Injection You can choose what kind of actual service you want to use when you instantiate the function. In a test you can substitute it with a mock!! The art of Azure Functions (unit) testing and monitoring!
- 14. Azure Function … how to use mock!! Mock Create a mock to use in the test!! The art of Azure Functions (unit) testing and monitoring!
- 15. DEMO Azure Functions Unit Testing The art of Azure Functions (unit) testing and monitoring!
- 16. Monitoring Azure Functions Once you deploy your Azure Functions on Azure, you need to monitor them to check when something goes wrong. The signature of an Azure Function Run method provides the instance of ILogger that you can use to log information about your code. Using ILogger, you can collect information from your code execution to monitor and triage errors and exceptions. The art of Azure Functions (unit) testing and monitoring!
- 17. Azure Functions Monitor Azure Functions provide out-of-the-box monitor feature. For each Function, you can have info about every function execution. The art of Azure Functions (unit) testing and monitoring!
- 18. Azure Functions and Application Insight The Azure Functions platform offers built-in integration with Azure Application Insights. Put the Application Insights instrumentation key in the function app settings. The art of Azure Functions (unit) testing and monitoring!
- 19. Configure monitoring Logging is configured in host.json file. Logger default level Logger level for all the functions in Function App Logger level for a specific function in Function App Logger category for .NET runtime components invoked by the host The art of Azure Functions (unit) testing and monitoring!
- 20. Custom Metrics Azure Function SDK provides you extension methods to log custom metrics. The art of Azure Functions (unit) testing and monitoring!
- 21. Pricing Azure Functions consumption plan is billed based on per-second resource consumption and executions The art of Azure Functions (unit) testing and monitoring!
- 22. Pricing Azure Functions consumption plan is billed based on per-second resource consumption and executions If your function use 1GB of memory and its duration is 1 second, you pay €0.000014 each time the function runs. The art of Azure Functions (unit) testing and monitoring!
- 23. Pricing Azure Functions consumption plan is billed based on per-second resource consumption and executions If your function runs 1 million times every month, you pay €0.169 each month. The art of Azure Functions (unit) testing and monitoring!
- 24. Pricing - Example You have a function: • It runs every second • Its duration is 1 second • It uses 512 MB of memory The art of Azure Functions (unit) testing and monitoring!
- 25. Resource Consumption Billing Calculation • It runs every second • Its duration is 1 second • It uses 512 MB of memory Executions 2,592,000 Resource Consumption Total 2,592,000 x 1 sec = 2,592,000 sec Total GB-s 2,592,000 x 0.5 GB = 1,296,000 GB-s Total billable consumption 1,296,000 – 400,000 = 896,000 GB-s Total cost 896,000 x 0.000014€ = 12.54 € The art of Azure Functions (unit) testing and monitoring!
- 26. Executions billing calculation • It runs every second • Its duration is 1 second • It uses 512 MB of memory Billable Monthly Executions 2,592,000 – 1,000,000 = 1,592,000 Total cost 1.592 x 0.169 € = 0.269 € The art of Azure Functions (unit) testing and monitoring!
- 27. Total Monthly Cost • It runs every second • Its duration is 1 second • It uses 512 MB of memory Monthly resource consumption cost 12.540 € Monthly executions cost 0.269 € Total monthly cost 12.809 € The art of Azure Functions (unit) testing and monitoring!
- 28. DEMO Azure Functions Monitoring The art of Azure Functions (unit) testing and monitoring!
- 29. Takeaway Write an Azure Functions is simple! Testing Azure Functions is simple! Monitoring Azure Functions is simple! …. then …. Photo by Aaron Burden on Unsplash
- 31. Massimo Bonanni Azure Technical Trainer @ Microsoft [email protected] @massimobonanni Connect with me on LinkedIn linkedin.com/in/massimobonanni/ http://bit.ly/MasteringServerless
- 32. References Azure Functions Documentation https://docs.microsoft.com/en-US/azure/azure-functions/ Azure Functions Code Samples https://azure.microsoft.com/en-us/resources/samples/?service=functions&sort=0 Azure Updates https://azure.microsoft.com/en-us/roadmap/?category=compute Azure Friday – Build Serverless APIs with Azure Functions https://azure.microsoft.com/en-us/resources/videos/azure-friday-build-serverless-apis-with-azure-functions/ GitHub Demo https://github.com/massimobonanni/AzureFunctionsSamples The art of Azure Functions (unit) testing and monitoring!