Handling OSError from Watchdog

Question

I have been using tkinter combined watchdog module to handle some uploading requests. Most of the time it works fine, but sometimes our network drive goes unstable and disconnec

Answer 1

This is how i solved this problem:

    from watchdog import observers
    from watchdog.observers.api import DEFAULT_OBSERVER_TIMEOUT, BaseObserver


    class MyEmitter(observers.read_directory_changes.WindowsApiEmitter):
        def queue_events(self, timeout):
            try:
                super().queue_events(timeout)
            except OSError as e:
                print(e)
                connected = False
                while not connected:
                    try:
                        self.on_thread_start()  # need to re-set the directory handle.
                        connected = True
                        print('reconnected')
                    except OSError:
                        print('attempting to reconnect...')
                        time.sleep(10)


    observer = BaseObserver(emitter_class=MyEmitter, timeout=DEFAULT_OBSERVER_TIMEOUT)
    ...

Subclassing WindowsApiEmitter to catch the exception in queue_events. In order to continue after reconnecting, watchdog needs to re-set the directory handle, which we can do with self.on_thread_start().

Then use MyEmitter with BaseObserver, we can now handle losing and regaining connection to shared drives.