這篇文章將為大家詳細(xì)講解有關(guān)python多進(jìn)程下中如何實(shí)現(xiàn)日志記錄按時(shí)間分割，小編覺得挺實(shí)用的，因此分享給大家做個(gè)參考，希望大家閱讀完這篇文章后可以有所收獲。
python多進(jìn)程下實(shí)現(xiàn)日志記錄按時(shí)間分割，供大家參考，具體內(nèi)容如下
原理：自定義日志handler繼承TimedRotatingFileHandler，并重寫computeRollover與doRollover函數(shù)。其中重寫computeRollover是為了能按整分鐘/小時(shí)/天來分割日志，如按天分割，2018-04-10 00:00:00~2018-04-11 00:00:00，是一個(gè)半閉半開區(qū)間，且不是原意的：從日志創(chuàng)建時(shí)間或當(dāng)前時(shí)間開始，到明天的這個(gè)時(shí)候。
代碼如下：
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#!/usr/bin/env python
# encoding: utf-8
"""自定義日志處理類"""
import os
import time
from logging.handlers import TimedRotatingFileHandler
class MyLoggingHandler(TimedRotatingFileHandler):
def __init__(self, filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False, atTime=None):
TimedRotatingFileHandler.__init__(self, filename, when=when, interval=interval, backupCount=backupCount, encoding=encoding, delay=delay, utc=utc, atTime=atTime)
def computeRollover(self, currentTime):
# 將時(shí)間取整
t_str = time.strftime(self.suffix, time.localtime(currentTime))
t = time.mktime(time.strptime(t_str, self.suffix))
return TimedRotatingFileHandler.computeRollover(self, t)
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()
self.stream = None
# 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.rotation_filename(self.baseFilename + "." +
time.strftime(self.suffix, timeTuple))
# 修改內(nèi)容--開始
# 在多進(jìn)程下，若發(fā)現(xiàn)dfn已經(jīng)存在，則表示已經(jīng)有其他進(jìn)程將日志文件按時(shí)間切割了，只需重新打開新的日志文件，寫入當(dāng)前日志；
# 若dfn不存在，則將當(dāng)前日志文件重命名，并打開新的日志文件
if not os.path.exists(dfn):
try:
self.rotate(self.baseFilename, dfn)
except FileNotFoundError:
# 這里會(huì)出異常：未找到日志文件，原因是其他進(jìn)程對(duì)該日志文件重命名了，忽略即可，當(dāng)前日志不會(huì)丟失
pass
# 修改內(nèi)容--結(jié)束
# 原內(nèi)容如下：
"""
if os.path.exists(dfn):
os.remove(dfn)
self.rotate(self.baseFilename, dfn)
"""
if self.backupCount > 0:
for s in self.getFilesToDelete():
os.remove(s)
if not self.delay:
self.stream = self._open()
newRolloverAt = self.computeRollover(currentTime)
while newRolloverAt <= 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說明
第一次修改，如有不妥之處，還請(qǐng)指出，不勝感激。
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