Azure Function isolated worker fails when binding/converting userProperties

remyvd · November 24, 2021, 4:09am

I have created an Azure Function Endpoint in isolated mode. Locally it runs, but when I deploy, I get a binding/conversion error on ‘userProperties’, see below.

Microsoft.Azure.WebJobs.Host.FunctionInvocationException: Exception while executing function: Functions.NServiceBusFunctionEndpointTrigger-AV.Spotler
 ---> Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcException: Result: Failure
Exception: Microsoft.Azure.Functions.Worker.Diagnostics.Exceptions.FunctionInputConverterException: Error converting 1 input parameters for Function 'NServiceBusFunctionEndpointTrigger-AV.Spotler': Cannot convert input parameter 'userProperties' to type 'System.Collections.Generic.IDictionary`2[[System.String, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.String, System.Private.CoreLib, Version=5.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]' from type 'System.String'.
   at Microsoft.Azure.Functions.Worker.Context.Features.DefaultModelBindingFeature.BindFunctionInput(FunctionContext context) in D:\a\1\s\src\DotNetWorker.Core\Context\Features\DefaultModelBindingFeature.cs:line 70

I have no clue how to fix this. I think this is part of the generated NserviceBus trigger?

NServiceBus.AzureFunctions.Worker.ServiceBus 2.0.1
Microsoft.Azure.Functions.Worker 1.6.0
Microsoft.Azure.Functions.Worker.Sdk 1.3.0

andreasohlund · November 24, 2021, 6:41am

Hi!

We have a fix merged and working on a backport to NServiceBus.AzureFunctions.Worker.ServiceBus 2.0.X

github.com/Particular/NServiceBus.AzureFunctions.Worker.ServiceBus

Host v4 fails to inject user properties as `IDictionary<string, string>` on retries

opened 01:36PM - 16 Nov 21 UTC

closed 05:31PM - 17 Nov 21 UTC

andreasohlund

bug

If an exception occurs when processing a message the retry attempt fails if usin…g the v4 host. Exception: ``` System.Private.CoreLib: Exception while executing function: Functions.NServiceBusFunctionEndpointTrigger-ASBWorkerEndpoint. System.Private.CoreLib: Result: Failure Exception: Microsoft.Azure.Functions.Worker.Diagnostics.Exceptions.FunctionInputConverterException: Error converting 1 input parameters for Function 'NServiceBusFunctionEndpointTrigger-ASBWorkerEndpoint': Cannot convert input parameter 'userProperties' to type 'System.Collections.Generic.IDictionary`2[[System.String, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.String, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]]' from type 'System.String'. at Microsoft.Azure.Functions.Worker.Context.Features.DefaultModelBindingFeature.BindFunctionInput(FunctionContext context) in D:\a\1\s\src\DotNetWorker.Core\Context\Features\DefaultModelBindingFeature.cs:line 70 at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionExecutor.ExecuteAsync(FunctionContext context) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionExecutor.cs:line 37 at Microsoft.Azure.Functions.Worker.OutputBindings.OutputBindingsMiddleware.Invoke(FunctionContext context, FunctionExecutionDelegate next) in D:\a\1\s\src\DotNetWorker.Core\OutputBindings\OutputBindingsMiddleware.cs:line 13 at Microsoft.Azure.Functions.Worker.GrpcWorker.InvocationRequestHandlerAsync(InvocationRequest request, IFunctionsApplication application, IInvocationFeaturesFactory invocationFeaturesFactory, ObjectSerializer serializer, IOutputBindingsInfoProvider outputBindingsInfoProvider) in D:\a\1\s\src\DotNetWorker.Grpc\GrpcWorker.cs:line 167 Stack: at Microsoft.Azure.Functions.Worker.Context.Features.DefaultModelBindingFeature.BindFunctionInput(FunctionContext context) in D:\a\1\s\src\DotNetWorker.Core\Context\Features\DefaultModelBindingFeature.cs:line 70 at Microsoft.Azure.Functions.Worker.Invocation.DefaultFunctionExecutor.ExecuteAsync(FunctionContext context) in D:\a\1\s\src\DotNetWorker.Core\Invocation\DefaultFunctionExecutor.cs:line 37 at Microsoft.Azure.Functions.Worker.OutputBindings.OutputBindingsMiddleware.Invoke(FunctionContext context, FunctionExecutionDelegate next) in D:\a\1\s\src\DotNetWorker.Core\OutputBindings\OutputBindingsMiddleware.cs:line 13 at Microsoft.Azure.Functions.Worker.GrpcWorker.InvocationRequestHandlerAsync(InvocationRequest request, IFunctionsApplication application, IInvocationFeaturesFactory invocationFeaturesFactory, ObjectSerializer serializer, IOutputBindingsInfoProvider outputBindingsInfoProvider) in D:\a\1\s\src\DotNetWorker.Grpc\GrpcWorker.cs:line 167. ``` ## Workaround You can work around this by implementing your own trigger class like this: (you need to comment out `[assembly:NServiceBusTriggerFunction("{endpointname}")]` to avoid the trigger to be autogenerated) ``` public class FunctionEndpointTrigger { IFunctionEndpoint endpoint; public FunctionEndpointTrigger(IFunctionEndpoint endpoint) { this.endpoint = endpoint; } [Function("NServiceBusFunctionEndpointTrigger-{endpointname}")] public async Task Run( [ServiceBusTrigger("{endpointname}")] byte[] messageBody, IDictionary<string, object> userProperties, string messageId, int deliveryCount, string replyTo, string correlationId, FunctionContext context) { await endpoint.Process(messageBody, userProperties.ToDictionary(k => k.Key, k => k.Value.ToString()), messageId, deliveryCount, replyTo, correlationId, context); } } ```

in the meantime, you can use the workaround mentioned in the above issue.

Hope this helps!

Andreas

remyvd · November 26, 2021, 3:17am

Hi,

The work around worked and the real error (the reason of the retry) is now visible. Thanks!

btw. this happend on azure function v3.0, not v4.0, in my situtation.

andreasohlund · November 26, 2021, 7:23am

Great news. We’re working on a fix and I’ll report back here once its available.

this happend on azure function v3.0, not v4.0, in my situation.

That is interesting we were not able to reproduce this on v3. Were you able to repro both locally and deployed to azure?