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Azure Functions in Action #CodePaLOUsa
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- 3. Agenda • Overview ofServer Less Computing • Why Server Less Computing? • Available Platforms • Demo using Azure – Kudu, Visual Studio, CLI • Overview and Demo of Durable Functions • Gotchas and Limitations with Server Less
- 4. My Intro • BaskarRao • Senior .Net Consultant with Compunnel Software Group. • @baskarmib • https://www.linkedin.com/in/baskarrao-dandlamudi • baskarrao.dandlamudi@outlook.com • www.compunnel.com • https://github.com/baskar3078/testazurefunctions
- 5. Server Less Computing- Overview • Does not mean No Servers. • Enables developers to develop and execute code with out server provisioning. • “Function as Service” is mainly used to develop event driven applications or perform recurring actions with easier configuration.
- 6. Why Server LessComputing ? • Enables developers to focus on the functionality with out worrying on performance by automatically scaling up or down based on demand. • Allows to pay for only the execution time along with costs for other resources like storage, network etc.. • Azure Functions, AWS Lambda, Google Cloud Functions , IBM Cloud Functions are different variations of function as service.
- 7. Platform Comparison AWS LambdaAzure Functions Google Function IBM Cloud Languages Java , Node.js, C# , Python C#, F#, Node.js, Python, PHP, Bash, Powershell, Custom exe JavaScript /Node.js Javascript/Node.js Swift, Python, Java, Docker (custom) Triggers HTTP, Event Based, Scheduled HTTP, Event Based, Scheduled HTTP , Event Based ,Scheduled Event Driven, HTTP Free Trial Yes Yes Yes Yes Free Requests 1 Million Free Request per month 1 Million Executions 400,000 GB-s 400,000 GB-seconds 2 million invocations 5GB of Internet egress traffic 400,000 GB-s free
- 8. Azure Functions- UseCases
- 9. Azure Functions • TimerBased Processing – Control the execution of function using Cron Expressions. • Event Based Processing – Respond to Events with in Azure landscape. Blob Storage, Queues etc. • Create Server Less APIs and integrate with Front End and Mobile Apps.
- 10. Azure Functions • Respondto Events from IOT Hub and Process Incoming Events. • Respond to GitHub Events using Web Hook. • Integrate with Azure Storage Account , Twilio and SendGrid for mail communication.
- 11. Functions Walkthrough-Azure Portal •Create an Http Trigger Function • Accept order through HttpRequest • Process the request and add an item to Azure Queue • Create an Queue Trigger Function • Save Processed Orders to Processed Orders Queue • Create an Timer Trigger Function • Send an Order Confirmation Email
- 12. Function Proxies-Azure Portal •Create an Azure Function Proxy • Define proxy route • Configure Back End url • Test the function proxy
- 13. Functions Walkthrough-Using Kudu •Below url can be used to launch kudu explorer https://functionappname.scm.azurewebsites.net • Kudu can be used to update settings and upload the files. • Example – updating settings to update Nuget Packages.
- 14. Functions Walkthrough-Using Kudu •Navigate to Debug Console and select cmd. • A command line tool will be enabled. • Using the command line tool, we can navigate to the folder pertaining to the above function. Function will be present inside wwwroot.
- 15. Functions Walkthrough-Visual Studio2017 • Create a function using Visual Studio 2017 • Debug a function using Visual Studio 2017 • First time debug might take time as Visual Studio will download Azure CLI tools • After you install or upgrade to Visual Studio 2017 version 15.3, you must manually update the Visual Studio 2017 tools for Azure Functions. You can update the tools from the Tools menu under Extensions and Updates... > Updates > Visual Studio Marketplace > Azure Functions and Web Jobs Tools > Update.
- 16. Functions Walkthrough-Visual Studio2017 • Publish a function using Visual Studio 2017 If we publish a function to an existing function app, it is possible that the function settings will be overridden to read only mode. These can be updated in Function app settings in azure portal to make the function in read/write mode in order to use azure portal for development.
- 17. Application Insights • AppInsights can be used to monitor - Number of Users - Number of Servers - Service Response Times - Total Number of Requests - Failed Request - Total Requests By Performance
- 18. Durable Functions • DurableFunctions are still in preview mode. • They support the development of stateful functions. • The following patterns are recommended for Durable Functions Function Chaining Fan Out and Fan In Pattern Async Http API and Monitoring Human Interaction. • Durable Functions are implemented using code workflows.
- 19. Demo Durable Functions •Durable Functions demo using Function Chaining Orchestrator Client Orchestration Activity Trigger1 Activity Trigger2 Activity Trigger3
- 20. Manage Durable Functions •statusQueryGetUri • sendEventPostUri • terminatePostUri
- 21. Manage Durable Functions •statusQueryGetUri
- 22. Manage Durable Functions •statusQueryGetUri
- 23. Key Points toObserve • In azure portal , all the bindings are declared through orchestration or Integrate tab. • Function developed from Visual Studio does not have the integrate tab options in portal. • The method signatures are different in portal and visual studio. VisualStudio it is required to provide the signature attributes. • When we use a Queue Trigger or any event based triggers until the function does not exit gracefully , function will keep on trying to execute the event repeatedly. • As of today Function Proxies and Deployment Slots are in Preview Mode.
- 24. Server Less Computing- Limitations Below are some disadvantages • There might be increase in response time from functions if they are not used continuously. • There is no direct control on the CPU size or Memory allocation as they are allocated based on usage while using Consumption Plan. • We can configure source control for functions developed in portal after initial deployment.
- 25. Code Samples Below arethe code samples in GitHub Http Trigger, Queue Trigger and Timer Trigger Functions https://github.com/baskar3078/testazurefunctions The above functions converted as Durable Function Activities https://github.com/baskar3078/durableFunctionSample
- 26. Questions https://www.linkedin.com/in/baskarrao-dandlamudi baskarrao.dandlamudi@outlook.com https://baskarrao.wordpress.com/ Thanks to theorganizers of CodePaLOUsa 2018 for giving me an opportunity to present.