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# Code to implement asynchronous logging from a background thread
#
# Copyright (C) 2016-2019 Kevin O'Connor <kevin@koconnor.net>
#
# This file may be distributed under the terms of the GNU GPLv3 license.
import logging, logging.handlers, threading, queue, time
# Class to forward all messages through a queue to a background thread
class QueueHandler(logging.Handler):
def __init__(self, queue):
logging.Handler.__init__(self)
self.queue = queue
def emit(self, record):
try:
self.format(record)
record.msg = record.message
record.args = None
record.exc_info = None
self.queue.put_nowait(record)
except Exception:
self.handleError(record)
# Class to poll a queue in a background thread and log each message
class QueueListener(logging.StreamHandler):
def __init__(self):
super().__init__()
self.bg_queue = queue.Queue()
self.bg_thread = threading.Thread(target=self._bg_thread)
self.bg_thread.start()
def _bg_thread(self):
while True:
record = self.bg_queue.get(True)
if record is None:
break
self.handle(record)
def stop(self):
self.bg_queue.put_nowait(None)
self.bg_thread.join()
MainQueueHandler = None
def setup_bg_logging(debuglevel):
global MainQueueHandler
ql = QueueListener()
MainQueueHandler = QueueHandler(ql.bg_queue)
root = logging.getLogger()
root.addHandler(MainQueueHandler)
root.setLevel(debuglevel)
return ql
def clear_bg_logging():
global MainQueueHandler
if MainQueueHandler is not None:
root = logging.getLogger()
root.removeHandler(MainQueueHandler)
root.setLevel(logging.WARNING)
MainQueueHandler = None
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