Azure Functions in .NET 7 (isolated) published to Azure, 0 functions loaded

Question

I'm trying to deploy an Azure Function (isolated) with .NET 7 to MS Azure using a GitHub Actions workflow. Everything seems to run fine, but for some reason, the Function is not loaded when I deploy it to the cloud. When I run the function local host, everything is fine (works on my machine), once deployed it doesn't.

public class DemoFunction
{
    private readonly ILogger _logger;

    public DemoFunction(ILoggerFactory loggerFactory)
    {
        _logger = loggerFactory.CreateLogger<DemoFunction>();
    }

    [Function("DemoFunction")]
    public HttpResponseData Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequestData req)
    {
        var response = req.CreateResponse(HttpStatusCode.OK);
        response.Headers.Add("Content-Type", "text/plain; charset=utf-8");
        response.WriteString("Demo function works!");

        return response;
    }
}

The Function App contains only a single function with an HTTP binding (no authentication, anonymous requests allowed). I use Bicep to deploy infra and GH Actions to deploy the Function App. Log Analytics shows this:

So for some reason it does find the function, but not load it. If I navigate to the Functions blade in the Azure Portal I don't see any function. The project is just a POC project and hosted publicly available at https://github.com/nikneem/function-deployment-with-gh-actions

Any ideas?

Answer 1

Oh wow, I found the answer in the deployment process. In my GitHub Actions workflow, I did a dotnet publish of the Azure Functions project to an output folder. I zipped the content of the output folder and published that zip file as a workflow artifact.

Then in the deployment, I downloaded the workflow artifact (e.g. that zip file) and did a Zip Deployment using that zip file.

Now apparently, something went wrong with this zip file, so I removed that manual zip action, mainly because I found out the deployment step in the GitHub Action also works when you pass a folder containing all published files in.

So the publish step in my GH Actions workflow now looks like this:

publish-functions:
  runs-on: ubuntu-latest
  needs: versionize
  steps:
    - uses: actions/checkout@v3
    - uses: actions/setup-dotnet@v3
      with:
        dotnet-version: "7.0.x"
    - name: Restore packages
      working-directory: src
      run: dotnet restore
    - name: Publish functions app
      working-directory: src
      run: dotnet publish $FUNCTIONS_PATH/$FUNCTIONS_PROJECT -c Release --no-restore -o functionsout /p:Version=${{needs.versionize.outputs.semver}}
    - name: Upload functions artifact
      uses: actions/upload-artifact@v3
      with:
        name: player-functions
        path: src/functionsout/*

and the deployment step looks like this:

deploy-function-app:
  runs-on: ubuntu-latest
  needs: [publish-functions, deploy-infrastructure-prod]
  steps:
    - uses: actions/download-artifact@v3
      with:
        name: player-functions
        path: function
    - uses: azure/login@v1
      with:
        creds: ${{secrets.AZURE_PROD}}
    - name: Deploy Azure Functions app
      uses: Azure/functions-action@v1
      with:
        app-name: ${{needs.deploy-infrastructure-prod.outputs.functionResourceName}}
        package: function

Taking a peek at the logs that the deployment process produces, it will still create a zip file and deploy that. But this is a different zip file than I created manually. All works fine now ;)