How can I know when Kestrel has started listening?

Question

I need to notify systemd that my service has started up successfully, and a task it needs to run after startup requires that the server is already listening

Answer 1

This is what I ended up going with, for now. Seems to be working fine:

host.Start();

Log.Information("Press Ctrl+C to shut down...");
Console.CancelKeyPress += OnConsoleCancelKeyPress;

var waitHandles = new WaitHandle[] {
    CancelTokenSource.Token.WaitHandle
};

WaitHandle.WaitAll(waitHandles);
Log.Information("Shutting down...");

Then, in the Ctrl+C event handler:

private static void OnConsoleCancelKeyPress(object sender, ConsoleCancelEventArgs e)
{
    Log.Debug("Got Ctrl+C from console.");
    CancelTokenSource.Cancel();
}