How to gracefully shutdown in a consoleless windows app. SIGTERM doesn't call lifespan

[danrossi]

I have an app that starts a pysysttray and then the uvicorn server in async tasks. I have issues programmatically shutting down when in a pyinstaller app without a console.

Only signal.SIGTERM works without a console but it won't call the lifespan callback. It ends the process with no change to end current running tasks.

If I run in a console and ctl+c it won't properly shut down pysystray task until I ctl+c a few times. I believe this is causing issues with an MSI installer closing the app properly.

Maybe I am launching the app incorrectly.

        server = Server(config)
        loop.create_task(run_in_threadpool(app.startSystray))
        loop.create_task(server.serve())
        loop.create_task(app.app_start())
        try:
            loop.run_forever()
        except KeyboardInterrupt:
            """"""
        finally:
            loop.stop()

In the app. If I launch pysystray from in the lifespan callback it still won't shutdown correctly with ctl+c. Only SIGTERM terminates everything but not graceful.

@contextlib.asynccontextmanager
async def lifespan(app : Starlette):
    logger.debug("Startup") 
    
    try:
        yield
        tasks = [t for t in asyncio.all_tasks() if t is not asyncio.current_task()]
        [task.cancel() for task in tasks]
        logger.debug("Canceling outstanding tasks")
        await asyncio.gather(*tasks)
        logger.info("Shutting down")
        loop.stop()
    except asyncio.exceptions.CancelledError as e:
        logger.debug("Cancelled")
    finally:
        """"""

A callback from pysystray to end the process. Won't run lifespan

def on_exit(self) -> None:

        if sys.platform == 'darwin':
            sig = signal.SIGKILL
        else:
            sig = signal.SIGTERM
            #sig = signal.CTRL_BREAK_EVENT

        os.kill(os.getpid(), sig)