Azure ServiceBusTopicTrigger - Isolated Function - Managed Identity

Question

I have got Azure Service bus topic trigger created. Not sure why it is not pulling messages off a subscription from a topic. I do have my user role setup in as reader/write in Azure using Visual studio 2022 login to organisations Azure Account.

Using the following versions :

  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.19.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.ServiceBus" Version="5.13.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.15.1" />
    
  </ItemGroup>

and local.settings.json as

{
    "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet-isolated",    
    "ServiceBusConnectionString__fullyQualifiedNamespace": "xxxxxx.servicebus.windows.net"
  }
}

and the function is simply as follows:

 [Function(nameof(ServiceBusTrigger))]
 public void Run([ServiceBusTrigger("xxxx", "yyyy", Connection = "ServiceBusConnectionString")] ServiceBusReceivedMessage message)
 {
     _logger.LogInformation("Message ID: {id}", message.MessageId);
     _logger.LogInformation("Message Body: {body}", message.Body);
     _logger.LogInformation("Message Content-Type: {contentType}", message.ContentType);
 }

function is started and confirmed messages are in subscription queue:

Azure Functions Core Tools
Core Tools Version:       4.0.5413 Commit hash: N/A  (64-bit)
Function Runtime Version: 4.25.3.21264

[2023-10-19T00:32:59.110Z] Found C:\SCM\Poc\functions\ServiceBusTopicDemo\LocalFunctionProj\LocalFunctionProj.csproj. Using for user secrets file configuration.
[2023-10-19T00:33:01.599Z] Worker process started and initialized.

Functions:

        ServiceBusTrigger: serviceBusTrigger

For detailed output, run func with --verbose flag.
[2023-10-19T00:33:05.890Z] Host lock lease acquired by instance ID '000000000000000000000000C8B5EEE0'.

Answer 1

Could you provide more detail about this?

Is the logging output actually fetching message data? I've done the exact same integration with queues, not topics and it works fine.

I see that your ServiceBusConnectionString is not the same as defined in your local.settings.json, that will be the case if not set correctly.

Besides that, everything seems okay.

Answer 2

So found out that for this to work need to add to Host.json file, it needs extensions to be added as shown:

"extensions": {
    "serviceBus": { "transportType": "amqpWebSockets" },
    "autoCompleteMessages": true
}