MYPIBLOGs

When we say serverless computing,right thing will be the Azure Functions. It is a modern serverless architecture delivering event driven cloud computing.

In Azure function we can run small pieces of code (called "functions") without worrying about application infrastructure. Or Azure Function is a serverless compute service that enables user to run event-triggered code without having to provision or manage infrastructure.

With Azure Functions, the cloud infrastructure provides all the up-to-date servers It can even be scaled according to demand. To build the apps themselves, the developers can use their own choice of programming language, giving them the freedom to work optimally.

A function is "triggered" by a specific type of event. Supported triggers include responding to changes in data, responding to messages, running on a schedule, or as the result of an HTTP request.

Azure function code Example.

// This is HTTP Trigger function,Lets try to understand code

#r "Newtonsoft.Json"    // to reference external assembly ,Use #r 

using System.Net;

using Microsoft.AspNetCore.Mvc;

using Microsoft.Extensions.Primitives;

using Newtonsoft.Json;

// HttpRequest  object will contain methods(get,post ),Header and body informations

//ILogger is to log to activity in function

public static async Task<IActionResult> Run(HttpRequest req, ILogger log)

{

    log.LogInformation("C# HTTP trigger function processed a request.");

  //fecthing the request querystring parameter

    string name = req.Query["name"];

  //Below three line to read the requestbody

//ReadToEndAsync read all data from the requestbody

    string requestBody = await new StreamReader(req.Body).ReadToEndAsync();

 //DeserializeObject to get the Json object

    dynamic data = JsonConvert.DeserializeObject(requestBody);

 //Get the name from data object

    name = name ?? data?.name;

    string responseMessage = string.IsNullOrEmpty(name) ? "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response." : $"Hello, {name}. This HTTP triggered function executed successfully.";

//Return http result

            return new OkObjectResult(responseMessage);

}

Key features of Azure Functions: