Introduction To Serverless Computing Using Azure Function

Serverless Computing
  • Serverless Computing is driven by performing some action as a response to a specific event or trigger.
  • While building serverless apps you don’t need to provision server or infrastructure.
  • Billing is based on resources consumed or actual time code is running.
  • No need to build the app to run the code, no need to set up infrastructure, no need to set up deployment infrastructure. Just focus on code.
Azure Function
  • Azure Function is a small piece of code that gets executed when some event occurs.
  • Just focus on code without worrying about the application and infrastructure to run it.
  • This is also called “function-as-a-service”
  • You can choose your favorite language to write Azure Function, such as C#, F#, Node.js, Java, or PHP.
  • Azure function helps you to build fully serverless applications
When to Use Azure Functions
  • Azure Functions can be a great solution while building small microservices or building simple APIs.
  • This can be helpful in scenarios like order processing, image processing, logging, file processing, etc.
  • You can also perform scheduling or batch processing tasks using Azure Functions.
Azure Function Trigger Templates
Azure Functions provide templates for key scenarios.
  • HTTPTrigger – Triggers some code when HTTP request received.
  • TimerTrigger – Performs a scheduled task like resource clean-up activities.
  • GitHub Webhook – Performs an action when something happened to the GitHub repository.
  • Generic Webhook – Processes HTTP requests from services that support webhooks.
  • CosmosDBTrigger – Processes Cosmos DB documents when they get added or updated.
  • BlobTrigger – Processes Azure Blobs when they get added to containers.
  • QueueTrigger – Responds messages when they get added to Storage Queue
  • EventHubTrigger – Responds to Event Hub events
  • ServiceBusQueueTrigger – Responds to message when get added in Azure Service bus queue
  • ServiceBusTopicTrigger – Subscribes to Service Bus topics and respond to topical events.
Azure Function Apps
  • Function apps are containers of Azure Function.
  • All Functions serving the same business value can be grouped together under a single Function App.
Create Your First Azure Function App
  • Login to Azure Portal and click "New".
  • In the search text box, write "Function App".
    Azure Function
  • Give a unique name to the Function app, select Subscription, Resource Group, and OS.
  • Select Hosting Plan
    • Consumption Plan – When the function runs, Azure sets up all necessary resources for you and you pay for the time that your code runs.
    • App Service Plan - Run Azure Function as a part of already existing App Service with no additional cost.
      Azure Function
  • Once the app gets created, you can view the newly created app under Function apps.
    Azure Function
Creating First Azure Function
  • Click on the Functions tab available under Function App.
  • Click on "New Function".
    Azure Function
  • Select HTTP Trigger Template.
    Azure Function
  • Select language as C# and give some name to the Function and click "Create".
    Azure Function
Test Function Using Portal
  • You can test the newly created function using Azure Portal.
  • Click on the "Test" tab available on the right-hand side of the portal.
    Azure Function
  • Click on "Run".
    Azure Function
  • Observe the "Output".
    Azure Function
Test Function using Postman
You can test the Azure function using Postman.
  • On Azure Portal, click on the ‘Get function URL’ option.
    Azure Function
  • Copy the URL. 
    Azure Function
  • Open Postman tool.
  • Paste the URL and set the HTTP method as POST.
  • Click the "Body" tab and select the raw option.
  • Select "Body Type" as application/JSON.
  • Add the following body.
    1. {  
    2.    "name":"Mangesh"  
    3. }  
  • Click on "Send".
    Azure Function
  • Observe the output.
    Azure Function

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