只是为了好玩，这是您可以如何子类化TimeRotatingFileHandler。当您运行以下脚本时，它将把日志文件写入/tmp/log_rotate*。
使用较小的time.sleep（例如0.1）值，日志文件会迅速填满，达到maxBytes限制，然后再进行滚动。
较大time.sleep（例如1.0）时，日志文件会缓慢填充，不会达到maxBytes限制，但是无论何时（达到10秒的时间间隔），它们都会翻转。
以下所有代码均来自logging / handlers.py。我只是以最简单的方式将TimeRotatingFileHandler与RotatingFileHandler网格化。
import time
import re
import os
import stat
import logging
import logging.handlers as handlers
class SizedTimedRotatingFileHandler(handlers.TimedRotatingFileHandler):
"""
Handler for logging to a set of files, which switches from one file
to the next when the current file reaches a certain size, or at certain
timed intervals
"""
def __init__(self, filename, maxBytes=0, backupCount=0, encoding=None,
delay=0, when='h', interval=1, utc=False):
handlers.TimedRotatingFileHandler.__init__(
self, filename, when, interval, backupCount, encoding, delay, utc)
self.maxBytes = maxBytes
def shouldRollover(self, record):
"""
Determine if rollover should occur.
Basically, see if the supplied record would cause the file to exceed
the size limit we have.
"""
if self.stream is None: # delay was set...
self.stream = self._open()
if self.maxBytes > 0: # are we rolling over?
msg = "%s\n" % self.format(record)
# due to non-posix-compliant Windows feature
self.stream.seek(0, 2)
if self.stream.tell() + len(msg) >= self.maxBytes:
return 1
t = int(time.time())
if t >= self.rolloverAt:
return 1
return 0
def demo_SizedTimedRotatingFileHandler():
log_filename = '/tmp/log_rotate'
logger = logging.getLogger('MyLogger')
logger.setLevel(logging.DEBUG)
handler = SizedTimedRotatingFileHandler(
log_filename, maxBytes=100, backupCount=5,
when='s', interval=10,
# encoding='bz2', # uncomment for bz2 compression
)
logger.addHandler(handler)
for i in range(10000):
time.sleep(0.1)
logger.debug('i=%d' % i)
demo_SizedTimedRotatingFileHandler()
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