Upgrading Microsoft.Azure.Functions.Worker.Sdk from 1.15.0 to 1.16.2 breaks my runtime: No job functions found

[ticedev-1972]

Running in debug on my dev machine with

Azure Functions Core Tools
Core Tools Version: 4.0.5455 Commit hash: N/A (64-bit)
Function Runtime Version: 4.27.5.21554

Results with 1.15.0 I get:

[2023-11-29T11:00:01.005Z] Loading functions metadata
[2023-11-29T11:00:01.012Z] Reading functions metadata (Host)
[2023-11-29T11:00:01.020Z] 0 functions found (Host)
[2023-11-29T11:00:01.059Z] Reading functions metadata (Custom)
[2023-11-29T11:00:01.174Z] 2 functions found (Custom)
[2023-11-29T11:00:01.192Z] 5 functions loaded

...but with 1.16.2 I get:

[2023-11-29T10:55:59.472Z] Loading functions metadata
[2023-11-29T10:55:59.475Z] Reading functions metadata (Host)
[2023-11-29T10:55:59.479Z] 0 functions found (Host)
[2023-11-29T10:55:59.481Z] Reading functions metadata (Custom)
[2023-11-29T10:55:59.482Z] 1 functions found (Custom)
[2023-11-29T10:55:59.485Z] 0 functions loaded
[2023-11-29T10:55:59.512Z] Generating 0 job function(s)
[2023-11-29T10:55:59.547Z] No job functions found. Try making your job classes and methods public. If you're using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).

I tried up/downgrading several times. Results are very persistent. Is there anything else I need to do ?

this is my main:

public static async Task Main()
{
    var host = new HostBuilder()
        .ConfigureFunctionsWorkerDefaults(builder =>
        {
            builder
                .AddApplicationInsights()
                .AddApplicationInsightsLogger();
        })
        .ConfigureAppConfiguration((hostContext, config) =>
        {
            config.AddJsonFile("host.json");
            config.AddEnvironmentVariables();
            config.Build();
        })
        .ConfigureServices(
            (hostContext, services) =>
            {
                services.AddTransient((s) => { return hostContext.Configuration; });
                services.AddTransient<IAppConfiguration, AppConfiguration>();
                services.AddTransient<IBlobStorageRepository, BlobStorageRepository>();
                services.AddTransient<IBlobStorageClientFactory, BlobStorageClientFactory>();
                services.AddTransient<IDocumentFilter, CustomDocumentFilter>();
            })
        .Build();

    var loggerFactory = host.Services.GetService<ILoggerFactory>()!;
    CustomDocumentFilter.Logger = loggerFactory.CreateLogger<CustomDocumentFilter>();

    await host.RunAsync();
}

And this is my function handler signature:

[Function(nameof(RequestHandler))]
[OpenApiOperation(
    operationId: nameof(RequestHandler),
    Summary = "Get data generically",
    Description = "Get data generically",
    Visibility = OpenApiVisibilityType.Important)]
[OpenApiResponseWithBody(
    statusCode: HttpStatusCode.NotFound,
    contentType: FunctionConstants.JsonContentType,
    bodyType: typeof(ProblemDetails),
    Summary = "No data found",
    Description = "Data could not be found")]
[OpenApiResponseWithBody(
    statusCode: HttpStatusCode.InternalServerError,
    contentType: FunctionConstants.JsonContentType,
    bodyType: typeof(ProblemDetails),
    Summary = "Error while retrieving the data",
    Description = "Error while attempting to retrieve the data")]
public HttpResponseData Handle(
    [HttpTrigger(AuthorizationLevel.Function, "get", Route = "{name}")]
    HttpRequestData request,
    string name)
{
    var response = request.CreateResponse();
    response.Headers.Add("Content-Type", "application/json");

... etc ...

[egeskov]

I experience the same problem.
The problem exist in version 1.16.(1-4) but not in 1.15.1.

My function declaration looks as follows:

[Function("GetSSIEvents")]
public async Task<HttpResponseData> RunAsync([HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "events.ical")] HttpRequestData req)
{
    ...

[dineshtripathi]

Updating Worker sdk from 1.16.4 - > 1.17.0

[2024-02-12T14:55:10.387Z] Loading functions metadata
[2024-02-12T14:55:10.402Z] Worker indexing is enabled
[2024-02-12T14:55:10.414Z] Fetching metadata for workerRuntime: dotnet-isolated
[2024-02-12T14:55:10.422Z] Reading functions metadata (Worker)
[2024-02-12T14:55:10.423Z] 0 functions found (Worker)
[2024-02-12T14:55:10.425Z] Reading functions metadata (Custom)
[2024-02-12T14:55:10.427Z] 1 functions found (Custom)
[2024-02-12T14:55:10.428Z] 0 functions loaded
[2024-02-12T14:55:10.475Z] Generating 0 job function(s)
2024-02-12T14:55:10.506Z] No job functions found. Try making your job classes and methods public. If you're using binding extensions (e.g. Azure Storage, ServiceBus, Timers, etc.) make sure you've called the registration method for the extension(s) in your startup code (e.g. builder.AddAzureStorage(), builder.AddServiceBus(), builder.AddTimers(), etc.).
[2024-02-12T14:55:10.519Z]

var host = new HostBuilder()
.ConfigureFunctionsWebApplication(builder => builder.AddHealthCheckMiddleware()).ConfigureServices( (context, services) =>
{
services.AddApplicationInsightsTelemetryWorkerService();
services.ConfigureFunctionsApplicationInsights();

My one function is in the nugetpackage middleware

[kshyju]

Do you have a local.settings.json in the root of your app?
See example here - https://github.com/Azure/azure-functions-dotnet-worker/blob/main/samples/Configuration/local.settings.json

[dineshtripathi]

Yes I have version 1.16.4 works fine but 1.17.0 worker failing to load the function

[kshyju]

Do you have your functions defined in the function app or in a class library which your function app is referring to?

[dineshtripathi]

Yes, correct. The function is defined in the library. It works with 1.16.4, but when upgraded to 1.17.0, it doesn't. In 1.17.0, one function must be present in the main function app (exe), and then it appears only else It doesn't discover the function which is in the library.