Migrate Azure Functions to isolated worker model for .NET 8

[Copilot]

Azure Functions were failing to load in production with Could not load file or assembly 'Microsoft.Extensions.Logging.Abstractions, Version=8.0.0.0'. The in-process model is deprecated and incompatible with .NET 8 in Azure Static Web Apps.

Changes

Project Configuration

• Replace Microsoft.NET.Sdk.Functions with isolated worker packages:
  • Microsoft.Azure.Functions.Worker
  • Microsoft.Azure.Functions.Worker.Sdk
  • Microsoft.Azure.Functions.Worker.Extensions.Http
• Add <OutputType>Exe</OutputType> to run as console app

Runtime Entry Point

Created Program.cs:

var host = new HostBuilder()
    .ConfigureFunctionsWebApplication()
    .Build();
host.Run();

Function Signatures

Converted all functions from in-process to isolated worker model:

Before:

public static class GetActivityCount
{
    [FunctionName("ActivityCount")]
    public static async Task<IActionResult> Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get")] HttpRequest req,
        ILogger logger)
    {
        var value = req.Query["param"];
        return new OkObjectResult(count);
    }
}

After:

public class GetActivityCount
{
    private readonly ILogger _logger;
    
    public GetActivityCount(ILoggerFactory loggerFactory) 
        => _logger = loggerFactory.CreateLogger<GetActivityCount>();

    [Function("ActivityCount")]
    public async Task<HttpResponseData> Run(
        [HttpTrigger(AuthorizationLevel.Anonymous, "get")] HttpRequestData req)
    {
        var query = HttpUtility.ParseQueryString(req.Url.Query);
        var value = query["param"];
        
        var response = req.CreateResponse(HttpStatusCode.OK);
        await response.WriteAsJsonAsync(count);
        return response;
    }
}

Updated Components

• 5 function handlers: Echo, GetActivityCount, GetAthlete, TokenExchange, SubscriptionWebhook
• StaticWebAppsAuth: Updated to parse headers from HttpRequestData
• ErrorHandler: Returns HttpResponseData instead of IActionResult

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Remaining 'cannot load file or assembly' problems.</issue_title>
<issue_description>Equipper is no longer able to load the Functions to handle API requests. The responses are 404s. The following is an example log for the 'ActivityCount' function. Other functions similarly fail to load.

The 'ActivityCount' function is in error: Could not load file or assembly 'Microsoft.Extensions.Logging.Abstractions, Version=8.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

Please research the requirements for running .net 8 API functions in an azure static web app. If you need additional information about the Equipper production runtime that cannot be determined from the source code, ask so that I can find it for you.

Following research, implement the necessary changes to allow the functions to start and serve requests.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remaining 'cannot load file or assembly' problems. #69

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