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OpenFaaS C# HTTP Template

This is no longer being maintained as the OpenFaaS community has decided to prefer csharp-httprequest-template over this implementation

This repository contains the template for OpenFaaS using the upgraded of-watchdog which allows for higher throughput.

$ faas template pull https://github.com/burtonr/csharp-kestrel-template
$ faas new --list
Languages available as templates:
- csharp-kestrel

This template uses a middleware handler in an ASPNET Core Web API. This allows additional context available in the request (by providing the full body to the handler) and more control over the response by passing it back to the HTTP reponse context.

Using the template

First, pull the template with the faas CLI and create a new function:

$ faas-cli template pull https://github.com/burtonr/csharp-kestrel-template
$ faas-cli new --lang csharp-kestrel <function name>

In the directory that was created, using the name of you function, you'll find FunctionHandler.cs. It will look like this:

using System;
using System.Threading.Tasks;
 
namespace Function
{
    public class FunctionHandler
    {
        public Task<string> Handle(string input)
        {
            return Task.FromResult($"Hello! Your input was {input}");
        }
    }
}

This is a simple implementation of a hello-world function.

You are able to add packages to your function using the dotnet add package syntax. The packages will be added to your final function's container automatically.

For example, you could add the popular Newtonsoft.JSON package for formatting JSON objects.

using System;
using System.Text;
using System.IO;
using System.Threading.Tasks;
using Newtonsoft.Json;

namespace Function
{
    public class SampleResponse
    {
        public string FunctionStatus { get; set; }
    }
    
    public class FunctionHandler
    {
        public Task<string> Handle(string input)
        {
            var res = new SampleResponse();
            res.FunctionStatus = "Success";


            var output = JsonConvert.SerializeObject(res);

            return Task.FromResult(output);
        }
    }
}

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.NET Core template for OpenFaaS with Kestrel

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