Interrupt paho mqtt client to reload subscriptions - python-3.x

Question

I have an mqtt client app that subscribes to topics based on a configuration file. Something like:
def connectMQTT():
global Connection
Connection = Client()
Connection.on_message = handleQuery
for clientid in clientids.allIDs(): # clientids.allIDs() reads files to get this
topic = '{}/{}/Q/+'.format(Basename, clientid)
print('subscription:', topic)
Connection.subscribe(topic)
I have been using it with a simple invocation like:
def main():
connectMQTT()
Connection.loop_forever()
The loop_forever will block forever. But I'd like to notice when the information read by clientids.allIDs() is out of date and I should reconnect forcing it to subscribe afresh.
I can detect a change in the files with pyinotify:
def filesChanged():
# NOT SURE WHAT TO DO HERE
def watchForChanges():
watchManager = pyinotify.WatchManager()
notifier = pyinotify.ThreadedNotifier(watchManager, FileEventHandler(eventCallback))
notifier.start()
watchManager.add_watch('/etc/my/config/dir', pyinotify.IN_CLOSE_WRITE | pyinotify.IN_DELETE)
Basically, I need loop_forever (or some other paho mqtt mechanism) to run until some signal comes from the pyinotify machinery. I'm not sure how to weld those two together though. In pseudo code, I thing I want something like
def main():
signal = setup_directory_change_signal()
while True:
connectMQTT()
Connection.loop(until=signal)
Connection.disconnect()
I'm not sure how to effect that though.

Answer 1

I finally circled around to the following solution which seems to work. Whereas I was trying to run the notifier in another thread and the mqtt loop in the main thread, the trick seemed to be invert that setup:
def restartMQTT():
if Connection:
Connection.loop_stop()
connectMQTT()
Connection.loop_start()
class FileEventHandler(pyinotify.ProcessEvent):
def process_IN_CREATE(self, fileEvent):
restartMQTT()
def process_IN_DELETE(self, fileEvent):
restartMQTT()
def main():
restartMQTT()
watchManager = pyinotify.WatchManager()
notifier = pyinotify.Notifier(watchManager, FileEventHandler())
watchManager.add_watch('/etc/my/config_directory', pyinotify.IN_CREATE | pyinotify.IN_DELETE)
notifier.loop()
Where connectMQTT stores a newly connected and configured MQTT client in the Connection global.