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c#azure-functions.net-8.0azure-app-configuration

Issue with Azure Function App QueueTrigger and AzureAppConfiguration Integration

I am currently working with an Azure Function App and several microservices that utilize Azure App Configuration. My goal is to use Azure App Configuration as a single source of configuration across all applications.

The function app includes a QueueTrigger that should be triggered based on key/value pairs managed in Azure App Configuration. However, I am encountering an issue where the function app does not trigger as expected.

During troubleshooting, I discovered that the function app only triggers when I add the key/value pair to the ENVIRONMENTVARIABLE section of the Azure Function App. This results in having to manage duplicate key/value pairs both in the ENVIRONMENTVARIABLE section and Azure App Configuration, which I want to avoid.

Could someone please help me understand why the Azure Function App is not triggering based on the key/value pairs managed in Azure App Configuration? Any insights or solutions to eliminate the need for duplicate key/value management would be greatly appreciated.

[Function(nameof(DemoFunction))]
public async Task Run([QueueTrigger("%" + AppKeys.DemoQueue + "%", Connection = AppKeys.AzureWebJobsStorage)] string message)
{
}

Here AppKeys.DemoQueue is managed both ENVIRONMENTVARIABLE (AzureFunctionApp) and as well as AzureAppConfiguration which should not be case. If I remove it from ENVIRONMENTVARIABLE then in that case the function app is not getting triggered whenever there is any message added to the AzureQueue.

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Can anyone help me here with some code sample which will serve as a reference for my implementation?

Solution

  • Azure Functions in isolated process do not support triggers from external configuration sources like Azure App Configuration. Here's a link to track the progress of this feature: Support expression resolution from configuration sources registered by the worker

    As a workaround, you could use App Configuration references for App Service and Azure Functions.