我刚刚编写了自己的日志处理程序,它只是通过管道将所有内容提供给父进程。我只测试了十分钟,但似乎效果很好。
(Note:这是硬编码的RotatingFileHandler
,这是我自己的用例。)
更新:@javier 现在将这种方法作为 Pypi 上可用的包进行维护 - 请参阅多处理记录 https://pypi.python.org/pypi/multiprocessing-logging/在 Pypi 上,github 上https://github.com/jruere/multiprocessing-logging https://github.com/jruere/multiprocessing-logging
更新:实施!
现在,它使用队列来正确处理并发,并且还可以正确地从错误中恢复。我现在已经在生产中使用它几个月了,下面的当前版本可以正常工作。
from logging.handlers import RotatingFileHandler
import multiprocessing, threading, logging, sys, traceback
class MultiProcessingLog(logging.Handler):
def __init__(self, name, mode, maxsize, rotate):
logging.Handler.__init__(self)
self._handler = RotatingFileHandler(name, mode, maxsize, rotate)
self.queue = multiprocessing.Queue(-1)
t = threading.Thread(target=self.receive)
t.daemon = True
t.start()
def setFormatter(self, fmt):
logging.Handler.setFormatter(self, fmt)
self._handler.setFormatter(fmt)
def receive(self):
while True:
try:
record = self.queue.get()
self._handler.emit(record)
except (KeyboardInterrupt, SystemExit):
raise
except EOFError:
break
except:
traceback.print_exc(file=sys.stderr)
def send(self, s):
self.queue.put_nowait(s)
def _format_record(self, record):
# ensure that exc_info and args
# have been stringified. Removes any chance of
# unpickleable things inside and possibly reduces
# message size sent over the pipe
if record.args:
record.msg = record.msg % record.args
record.args = None
if record.exc_info:
dummy = self.format(record)
record.exc_info = None
return record
def emit(self, record):
try:
s = self._format_record(record)
self.send(s)
except (KeyboardInterrupt, SystemExit):
raise
except:
self.handleError(record)
def close(self):
self._handler.close()
logging.Handler.close(self)