How can I improve debugging functions? - azure

Question

I've improved my code a bit, moving the timer to app settings and using %% variable in the timer definition of the function.
I have a function that I want to run every night at 1am. But for debugging I really want it to fire as fast as possible after startup. I solved this by setting the pattern to 5 * * * * * timer in app setting locally, and 0 0 1 * * * in the app config in Azure.
But I don't want to have it actually run every 5 sec, I just want it to fire as fast as possible while debugging. So I've added a counter variable. Enabling only the first run to move forward:
private static int count = 0;
[Disable]
[FunctionName("FetchProjects")]
async public static void Run([TimerTrigger("%FetchProjectsTimer%")]TimerInfo myTimer, TraceWriter log)
{
#if DEBUG
if (count != 0) return;
count++;
#endif
How can I improve this if possible? The count isn't thread safe for one, and I want to remove the #if DEBUG check if possible

Answer 1

It's not clear what you're trying to achieve. You just want to test the logic of your time trigger? What about unit test it (just the logic).
I usually leave my Azure functions as thin as possible and unit test the business logic. Here's how you can do it:
public static class Function1
{
[FunctionName("Function1")]
public static void Run([TimerTrigger("0 */5 * * * *")]TimerInfo myTimer, ILogger log)
{
log.LogInformation($"C# Timer trigger function executed at: {DateTime.Now}");
FooService.DoFoo();
}
[FunctionName("Function2")]
public static async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req, ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
FooService.DoFoo();
return new OkObjectResult($"Success");
}
}
//extracted logic which I will be tested by Nunit
public static class FooService
{
public static void DoFoo()
{
//some logic in here
}
}