ASP.NET Core Serverless on AWS Lambda

 1{
 2    "AWSTemplateFormatVersion" : "2010-09-09",
 3    "Transform" : "AWS::Serverless-2016-10-31",
 4    "Description" : "An AWS Serverless Application that uses the ASP.NET Core framework running in Amazon Lambda.",
 5
 6    "Parameters" : {
 7    },
 8
 9    "Conditions" : {
10    },
11
12    "Resources" : {
13
14        "AspNetCoreFunction" : {
15            "Type" : "AWS::Serverless::Function",
16            "Properties": {
17                "Handler": "AWSServerless::AWSServerless.LambdaEntryPoint::FunctionHandlerAsync",
18                "Runtime": "dotnetcore2.1",
19                "CodeUri": "",
20                "MemorySize": 512,
21                "Timeout": 30,
22                "Role": null,
23                "Policies": [ "AWSLambdaFullAccess" ],
24                "Environment" : {
25                    "Variables" : {
26                    }
27                },
28                "Events": {
29                    "ProxyResource": {
30                        "Type": "Api",
31                        "Properties": {
32                            "Path": "/{proxy+}",
33                            "Method": "ANY"
34                        }
35                    },
36                    "RootResource": {
37                        "Type": "Api",
38                        "Properties": {
39                            "Path": "/",
40                            "Method": "ANY"
41                        }
42                    }
43                }
44            }   
45        }
46    },
47
48    "Outputs" : {
49        "ApiURL" : {
50            "Description" : "API endpoint URL for Prod environment",
51            "Value" : { "Fn::Sub" : "https://${ServerlessRestApi}.execute-api.${AWS::Region}.amazonaws.com/Prod/" }
52        }
53    }
54}

 1
 2namespace AWSServerless
 3{
 4    public class Program
 5    {
 6        public static void Main(string[] args)
 7        {
 8            BuildWebHost(args).Run();
 9        }
10
11        public static IWebHost BuildWebHost(string[] args) =>
12            WebHost.CreateDefaultBuilder(args)
13                .UseStartup<Startup>()
14                .Build();
15    }
16}

 1namespace AWSServerless
 2{
 3    /// <summary>
 4    /// This class extends from APIGatewayProxyFunction which contains the method FunctionHandlerAsync which is the 
 5    /// actual Lambda function entry point. The Lambda handler field should be set to
 6    /// 
 7    /// AWSServerless::AWSServerless.LambdaEntryPoint::FunctionHandlerAsync
 8    /// </summary>
 9    public class LambdaEntryPoint :
10        // When using an ELB's Application Load Balancer as the event source change 
11        // the base class to Amazon.Lambda.AspNetCoreServer.ApplicationLoadBalancerFunction
12        Amazon.Lambda.AspNetCoreServer.APIGatewayProxyFunction
13    {
14        /// <summary>
15        /// The builder has configuration, logging and Amazon API Gateway already configured. The startup class
16        /// needs to be configured in this method using the UseStartup<>() method.
17        /// </summary>
18        /// <param name="builder"></param>
19        protected override void Init(IWebHostBuilder builder)
20        {
21            builder
22                .UseStartup<Startup>();
23        }
24    }
25}

 1using System;
 2using Microsoft.AspNetCore.Mvc;
 3
 4namespace AWSServerless.Controllers
 5{
 6    [Route("hello")]
 7    public class HelloController : Controller
 8    {
 9        public static DateTime Cached = DateTime.Now;
10
11        public IActionResult Index()
12        {
13            dynamic output = new
14            {
15                Servername = Environment.MachineName,
16                Current = DateTime.UtcNow,
17                Cached = Cached
18            };
19            return Ok(output);
20        }
21    }
22}

1{
2    "servername":"169",
3    "current":"2019-07-18T16:09:42.1432922Z",
4    "cached":"2019-07-18T16:09:36.0130443+00:00"
5}