Not able to register on Azure Functions since there is no extension for IFunctionsHostBuilder

[joaoantunes]

Azure Functions V2 now supports .net dependency injection
In order to achieve that you need to do the following code:

[assembly: FunctionsStartup(typeof(MyNamespace.Startup))]
namespace MyNamespace
{
    public class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            builder.Services.AddHttpClient();
            builder.Services.AddSingleton((s) => {
                return new CosmosClient(Environment.GetEnvironmentVariable("COSMOSDB_CONNECTIONSTRING"));
            });
            builder.Services.AddSingleton<ILoggerProvider, MyLoggerProvider>();
        }
    }
}

I want to change the default container to use Lamar

O the documentation there is an example for a WebHost:

var builder = new WebHostBuilder();
builder
    // Replaces the built in DI container
    // with Lamar
    .UseLamar()
    
    // Normal ASP.Net Core bootstrapping
    .UseUrls("http://localhost:5002")
    .UseKestrel()
    .UseStartup<Startup>();

builder.Start();

But I'm not able to change IFunctionsHostBuilder to use "UseLamar()" extension. Since this extends IWebHostBuilder.
The only ways I was able to intercept the initialization of azure functions was Either with FunctionsStartup that configures IFunctionsHostBuilder or IWebJobsStartup that configures IWebJobsBuilder, but I don't find extensions for those kinds of builds on Lamar.

I've tried to check the existing extension to create a similar code but is not working because probably I need to create more stuff:

[assembly: FunctionsStartup(typeof(FunctionAppPrototype.Startup))]
namespace FunctionAppPrototype
{
    public class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            var container = new Container(x =>
            {
                x.AddTransient<IMyService, MyService>();
            });

            builder.Services.AddSingleton<IServiceProviderFactory<IServiceCollection>, LamarServiceProviderFactory>();
            builder.Services.AddSingleton<IServiceProviderFactory<ServiceRegistry>, LamarServiceProviderFactory>();
        }
    }
}

[jeremydmiller]

@joaoantunes I would accept a pull request for adding a new Nuget that supports the Azure FunctionsBuilder.

Regardless of a pull request, you should be able to pretty well copy/paste the little bit of code for IHostBuilder support in the AspNetCore adapter

[jeremydmiller]

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