如何使用asyncio处理闭包

Question

I'm trying to do some asynchronous messaging for a controller project that I'm doing, and the goal of the following function is to return a callback to an appjar app.registerEvent call, which will update the status section of the motor control UI.

def motorStatusMonitor(loop: aio.AbstractEventLoop, app: aj.appjar.gui, Messenger: cmd.PyCmdMessenger.CmdMessenger)-> Callable:
    async def getStatus(aFuture):
        nonlocal Messenger
        nonlocal app
        # Ask for the current status of the motor
        t = await Control.sendCommand(Messenger, "Status")
        d = {t[1][0]: t[1][1], t[1][2]: t[1][3]}  # parse the response
        def statusChanger():  # need a closure to write to the app when called
            nonlocal d  # use the message from above
            nonlocal app  # use the app passed with motorStatusMonitor
            app.openTab("Main", "Control")
            app.openLabelFrame("Status")
            app.setLabel("motorStatus", f"Motor A: \t\t {get('A', d, '???')}\nMotor B: \t\t {get('B', d, '???')}") # Print the status of the motors to the app
        aFuture.set_result(statusChanger)

    future = aio.Future()
    aio.ensure_future(getStatus(future))
    loop.run_until_complete(future)
    return future.result()

However, this doesn't work, as when I do app.registerEvent(motorStatusMonitor(event_loop, app, Messenger)) it just hangs forever.

How should I actually be going about implementing async here?

Full code for everything is at Github .

Answer 1

This:

loop.run_until_complete(future)

Is waiting the for the future to complete which it never does.

Also you must not call future.result() but instead something like await future which will return the result.