.Net in a Serverless World

Serverless development is becoming a pretty common pattern now-a-days. There are some nice libraries and frameworks popping up and the aptlay named Serverless seems to be the most popular.¹

Serverless does support dotnet core using C# out of the box. They even have a generator.

sls create --template aws-csharp --path helloService

This is a fantastic starting point for any other than a REST API. If you try and use this stub, you end up having to implement half of WebAPI manually to be able to get niceties such as Dependency Injection and logging.

I have found the the AWS template is far more suitable to implementing an actual REST API and it is just as simple to get started.

dotnet new -i "Amazon.Lambda.Templates::*"
dotnet new serverless.AspNetCoreWebAPI -o my-serverless-api

This will create a new .Net Core Web API application in the my-serverless-api folder including a CloudFormation template for easy deployment and a cake file for build, test and deploy. For those that have done extensive WebAPI work, the structure will feel a lot more familiar.

├── README.md
├── Solution.sln
├── build.cake
├── build.ps1
├── build.sh
├── src
│   └── HelloWorld
│       ├── HelloWorld.csproj
│       └── Program.cs
├── template.yaml
└── test
    └── HelloWorld.Test
        ├── FunctionTest.cs
        └── HelloWorld.Tests.csproj