self.queue.task_done() can be called when no message was got due to continue executing finally block anyway leading to ValueError exception

[kmorwath]

The changes in version 2.2 for fix #25 in python_logging_rabbitmq/handlers_oneway.py may have introduced an issue. Before the Queue.Empty exception was never raised because record, routing_key = self.queue.get() had no timeout. Now when the exception is raised if no messages arrives within 10s, the exception handler will call "continue" but still the "finally" block is executed anyway - and queue.task_done() could be called more times than put() and it will lead to a ValueError exception.

queue.task_done() should be called in a inner "try..finally" block after a message has been dequeued actually, for example:

record, routing_key = self.queue.get(block=True, timeout=10)
try:
#Actually got a message
... try to send the message ...
finally:
queue.task_done()

Moreover when is_stopping is set the loop is exited before queue.task_done() is called, and messages still in the queue are not processed. If on the other side of the queue something attempts to call queue.join() it could never return.