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    <p>So I made a small hack to <code>TimedRotatingFileHandler</code> to be able to do rollover after both, time and size. I had to modify <code>__init__</code>, <code>shouldRollover</code>, <code>doRollover</code> and <code>getFilesToDelete</code> (see below). This is the result, when I set up when='M', interval=2, backupCount=20, maxBytes=1048576:</p> <pre><code>-rw-r--r-- 1 user group 185164 Jun 10 00:54 sumid.log -rw-r--r-- 1 user group 1048462 Jun 10 00:48 sumid.log.2011-06-10_00-48.001 -rw-r--r-- 1 user group 1048464 Jun 10 00:48 sumid.log.2011-06-10_00-48.002 -rw-r--r-- 1 user group 1048533 Jun 10 00:49 sumid.log.2011-06-10_00-48.003 -rw-r--r-- 1 user group 1048544 Jun 10 00:50 sumid.log.2011-06-10_00-49.001 -rw-r--r-- 1 user group 574362 Jun 10 00:52 sumid.log.2011-06-10_00-50.001 </code></pre> <p>You can see that first four logs were rolled over after reaching size of 1MB, while the last rollover occurred after two minutes. So far I didn't test deleting of old log files, so it probably doesn't work. The code certainly will not work for backupCount>=1000. I append just three digits at the end of the file name.</p> <p>This is the modified code:</p> <pre><code>class EnhancedRotatingFileHandler(logging.handlers.TimedRotatingFileHandler): def __init__(self, filename, when='h', interval=1, backupCount=0, encoding=None, delay=0, utc=0, maxBytes=0): """ This is just a combination of TimedRotatingFileHandler and RotatingFileHandler (adds maxBytes to TimedRotatingFileHandler) """ logging.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. we are also comparing times """ if self.stream is None: # delay was set... self.stream = self._open() if self.maxBytes &gt; 0: # are we rolling over? msg = "%s\n" % self.format(record) self.stream.seek(0, 2) #due to non-posix-compliant Windows feature if self.stream.tell() + len(msg) &gt;= self.maxBytes: return 1 t = int(time.time()) if t &gt;= self.rolloverAt: return 1 #print "No need to rollover: %d, %d" % (t, self.rolloverAt) return 0 def doRollover(self): """ do a rollover; in this case, a date/time stamp is appended to the filename when the rollover happens. However, you want the file to be named for the start of the interval, not the current time. If there is a backup count, then we have to get a list of matching filenames, sort them and remove the one with the oldest suffix. """ if self.stream: self.stream.close() # get the time that this sequence started at and make it a TimeTuple currentTime = int(time.time()) dstNow = time.localtime(currentTime)[-1] t = self.rolloverAt - self.interval if self.utc: timeTuple = time.gmtime(t) else: timeTuple = time.localtime(t) dstThen = timeTuple[-1] if dstNow != dstThen: if dstNow: addend = 3600 else: addend = -3600 timeTuple = time.localtime(t + addend) dfn = self.baseFilename + "." + time.strftime(self.suffix, timeTuple) if self.backupCount &gt; 0: cnt=1 dfn2="%s.%03d"%(dfn,cnt) while os.path.exists(dfn2): dfn2="%s.%03d"%(dfn,cnt) cnt+=1 os.rename(self.baseFilename, dfn2) for s in self.getFilesToDelete(): os.remove(s) else: if os.path.exists(dfn): os.remove(dfn) os.rename(self.baseFilename, dfn) #print "%s -&gt; %s" % (self.baseFilename, dfn) self.mode = 'w' self.stream = self._open() newRolloverAt = self.computeRollover(currentTime) while newRolloverAt &lt;= currentTime: newRolloverAt = newRolloverAt + self.interval #If DST changes and midnight or weekly rollover, adjust for this. if (self.when == 'MIDNIGHT' or self.when.startswith('W')) and not self.utc: dstAtRollover = time.localtime(newRolloverAt)[-1] if dstNow != dstAtRollover: if not dstNow: # DST kicks in before next rollover, so we need to deduct an hour addend = -3600 else: # DST bows out before next rollover, so we need to add an hour addend = 3600 newRolloverAt += addend self.rolloverAt = newRolloverAt def getFilesToDelete(self): """ Determine the files to delete when rolling over. More specific than the earlier method, which just used glob.glob(). """ dirName, baseName = os.path.split(self.baseFilename) fileNames = os.listdir(dirName) result = [] prefix = baseName + "." plen = len(prefix) for fileName in fileNames: if fileName[:plen] == prefix: suffix = fileName[plen:-4] if self.extMatch.match(suffix): result.append(os.path.join(dirName, fileName)) result.sort() if len(result) &lt; self.backupCount: result = [] else: result = result[:len(result) - self.backupCount] return result </code></pre>
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    1. POThe logging.handlers: How to rollover after time or maxBytes?
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    1. USCody A. Ray
    1. USsumid
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    1. POThe logging.handlers: How to rollover after time or maxBytes?
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    1. COThanks for sharing.
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      1. USVinay Sajip
    2. COI just fixed a bug in TimedRotatingFileHandler in Python, relating to daylight saving time and the file name time suffix. You may want to consider applying the fix here, too: http://hg.python.org/cpython/rev/a5c4b8ccca8b
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      1. USVinay Sajip
 

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