Microservice – Chandradev's Blog

As you know Micro service is one alternative approach to write Web API method. There are so many ways to create the micro-service. But in this post i m going to write creating micro service using Amazon Web Service(AWS) Lambda ToolKit on Asp.net Core

what is the Serverless Microservices ?

Serverless microservices are deployed within a serverless vendor’s infrastructure and only run when they are needed by the application. Depending on the size of a microservice, it may also be broken up into even smaller functions.

It doesn’t means that there will be no server. There will be cloud vendor’s server.

AWS use the Lamda and API gateways for this functionalities.

What are the advantages of this approach ?

1. You don’t have to pay for idle server time. So it will save huge deployment cost
2. If you have small application like POC and you are going to use that application for specific time interval then this approach will good. It will save huge money.
3. On demand we can scale the application, since it is on cloud.
4. It is give good performance as compare to monolithic approach.

How to create Serverless microservice with AWS

Step 1: Install the AWS Toolkit Extension as given below

Step 2: Create the Web Api Serverless Project like this

This template will add the all the requited dll and required files for us to making serverless microservice

Step 3: Add some Empty API controller in Controller folder and write some test method like this



using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Net.Http;

namespace AWSServerless3.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class TestController : ControllerBase
    {
        // GET: api/Test
        [HttpGet]
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "This is from Test Controller" };
        }
        //external
        [HttpGet]
        [Route("external")]
        public string External()
        {
            try
            {
                HttpClient client = new HttpClient();
                var requestTask = client.GetStringAsync("http://www.chandradev819.wordpress.com");
                requestTask.Wait();
                return "external connectivity PASS";
            }
            catch (Exception e)
            {
                return "external connectivity FAIL";
            }
        }


    }
}

Add one more controller i.e EmpController



using Microsoft.AspNetCore.Mvc;
using System.Collections.Generic;

namespace AWSServerless3.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class EmpController : ControllerBase
    {
        // GET: api/Emp
        [HttpGet]
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "This is from Emp Controller" };
        }
    }
}

Step 4; Build the application and run on local machine before deployment