Azure functions migrated to dotnet-isolated now shows error "Worker failed to index functions"

Question

Azure functions migrated to dotnet-isolated now shows error "Worker failed to index functions"

KonradSL 76

I migrated my Azure Function App to the new dotnet-isolated with .NET8. It compiled well - but when I start the app from within VST for debugging, it shows errors:

Worker failed to index
functionsResult: Failure
Exception: System.InvalidOperationException: Functions must declare at least one binding. No bindings were found in the function $func
.at Microsoft.Azure.Functions.Worker.GrpcWorker.GetFunctionMetadataAsync(String functionAppDirectory) in D:\a\_work\1\s\src\DotNetWorker.Grpc\GrpcWorker.cs:line 165Stack:    at Microsoft.Azure.Functions.Worker.GrpcWorker.GetFunctionMetadataAsync(String functionAppDirectory) in D:\a\_work\1\s\src\DotNetWorker.Grpc\GrpcWorker.cs:line 165.

But nevertheless, it continue to run and find all my functions:

Worker process started and initialized.
Functions:
        CleanupData: timerTrigger
        CreateOpenTests: timerTrigger
...

But the error is very annoying. You don't want red error messages in the console. My project file after the migration looks like this:

<Project Sdk="Microsoft.NET.Sdk">
	<PropertyGroup>
		<TargetFramework>net8.0</TargetFramework>
		<AzureFunctionsVersion>v4</AzureFunctionsVersion>
		<OutputType>Exe</OutputType>
	</PropertyGroup>
	<ItemGroup>
		<None Remove="Migrations\20200509132620_VisualDateNewField.cs~RF201e58c6.TMP" />
	</ItemGroup>
	<ItemGroup>
		<PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.DurableTask" Version="1.1.1" />
		<PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.DurableTask.SqlServer" Version="1.2.2" />
		<PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Tables" Version="1.3.0" />
		<PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Timer" Version="4.3.0" />
		<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.1">
			<PrivateAssets>all</PrivateAssets>
			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
		</PackageReference>
		<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="8.0.1" />
		<PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="8.0.1">
			<PrivateAssets>all</PrivateAssets>
			<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
		</PackageReference>
		<FrameworkReference Include="Microsoft.AspNetCore.App" />
		<PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.21.0" />
		<PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.17.0" />
		<PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="1.2.1" />
		<PackageReference Include="Microsoft.ApplicationInsights.WorkerService" Version="2.22.0" />
		<PackageReference Include="Microsoft.Azure.Functions.Worker.ApplicationInsights" Version="1.2.0" />
		<PackageReference Include="OAuth.DotNetCore" Version="3.0.1" />
		<PackageReference Include="ProjNet" Version="2.0.0" />
		<PackageReference Include="System.Configuration.ConfigurationManager" Version="8.0.0" />
	</ItemGroup>
	<ItemGroup>
		<None Update="host.json">
			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
		</None>
		<None Update="local.settings.json">
			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
			<CopyToPublishDirectory>Never</CopyToPublishDirectory>
		</None>
	</ItemGroup>
	<ItemGroup>
		<Using Include="System.Threading.ExecutionContext" Alias="ExecutionContext" />
	</ItemGroup>
</Project>

And my Program.cs is also the default one:

public class Program
{
   static void Main(string[] args)
   {
      String SqlConnection = Environment.GetEnvironmentVariable("SqlConnectionString");
      var host = new HostBuilder()
                .ConfigureFunctionsWebApplication()
                .ConfigureServices(services =>
                {
                    services.AddApplicationInsightsTelemetryWorkerService();
                    services.ConfigureFunctionsApplicationInsights();
                    services.AddDbContext<MyContext>(options => options.UseSqlServer(SqlConnection, opts => opts.CommandTimeout(1000))
                                    .LogTo(Console.WriteLine, LogLevel.Information)
                                    .ConfigureWarnings(b => b.Log((RelationalEventId.CommandExecuted, LogLevel.Trace))));
                })
                .Build();
            host.Run();
   }
}

But where does the error comes from, if at the end all functions are started and indexed properly?

MikeUrnun 9,777 Reputation points Moderator

2024-02-15T05:05:39.0233333+00:00

Hi @KonradSL Could you share the signatures of the functions?
KonradSL 76 Reputation points

2024-02-15T08:16:50.41+00:00
That's one of the function's signature, that causes the error - if I remove this function, everything runs fine:

[Function("ProcessSingleCityMessageList")] public async Task ProcessSingleCityMessageList(TaskOrchestrationContext context)

This function was migrated from in-process model to isolated worker model and had this signature before:

public void ProcessSingleCityMessageList([OrchestrationTrigger] IDurableOrchestrationContext context, ILogger log)

KonradSL 76

One of the function (if I remove it, the error is gone) has this signature:

[Function("ProcessSingleCityMessageList")]
public async Task ProcessSingleCityMessageList(TaskOrchestrationContext context)

Had this signature before migration to isolated worker model:

public void ProcessSingleCityMessageList([OrchestrationTrigger] IDurableOrchestrationContext context, ILogger log)

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MikeUrnun 9,777 Reputation points Moderator

2024-02-15T05:05:39.0233333+00:00

Hi @KonradSL Could you share the signatures of the functions?
KonradSL 76 Reputation points

2024-02-15T08:16:50.41+00:00

That's one of the function's signature, that causes the error - if I remove this function, everything runs fine:

[Function("ProcessSingleCityMessageList")] public async Task ProcessSingleCityMessageList(TaskOrchestrationContext context)

This function was migrated from in-process model to isolated worker model and had this signature before:

public void ProcessSingleCityMessageList([OrchestrationTrigger] IDurableOrchestrationContext context, ILogger log)
KonradSL 76 Reputation points

2024-02-15T08:19:20.14+00:00

One of the function (if I remove it, the error is gone) has this signature:

[Function("ProcessSingleCityMessageList")] public async Task ProcessSingleCityMessageList(TaskOrchestrationContext context)

Had this signature before migration to isolated worker model:

public void ProcessSingleCityMessageList([OrchestrationTrigger] IDurableOrchestrationContext context, ILogger log)

Answer 1

MikeUrnun 9,777 Moderator

Hi @KonradSL - Thanks for providing additional info. Does something like the following work?

[Function("ProcessSingleCityMessageList")]
public async Task ProcessSingleCityMessageList([OrchestrationTrigger] IDurableOrchestrationContext context, ILogger log)
{

}

The use of the Function attribute tells the Host process that ProcessSingleCityMessageList() should be one of the functions that needs to be synced/indexed but it doesn't have a valid input hence the "Functions must declare at least one binding. No bindings were found in the function" error message.

Md Nazish Kaunain 0 Microsoft Employee

I am also facing the same error. It is not able to index this simple Http trigger function.

namespace pave.ai.wsdloganalyzer;
public class Ping
{
    private readonly ILogger<Ping> _logger;
    public Ping(ILogger<Ping> logger)
    {
        _logger = logger;
    }
    [Function(nameof(Ping))]
    public IActionResult Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequest req)
    {
        _logger.LogInformation("C# HTTP trigger function processed a request.");
        return new OkObjectResult("Welcome to Azure Functions!");
    }
}

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Azure functions migrated to dotnet-isolated now shows error "Worker failed to index functions"

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