我正在尝试使用TimedRotatingFileHandler将每日日志保存在单独的日志文件中。旋转按预期完美地工作，但我不喜欢它的工作方式是文件的命名。
如果我将日志文件设置为 my_log_file.log，这将是“今天的”日志文件，当它在午夜更改一天时，它将被重命名为my_log_file.log.2014-07-08最后没有 .log 扩展名，并且my_log_file.log将为新的一天。
我想得到的是旧文件被重命名为my_log_file.2014-07-08.logor even my_log_file-2014-07-08.log，主要是 .log 在最后，而不是在中间。另外，我希望“今天的”日志文件已经用今天的日期命名，就像旧的一样。
有什么办法吗？
我发现我可以通过以下方式个性化后缀：
handler.suffix = "%Y-%m-%d"
但是我没有办法删除内部 .log 部分并强制当前日志文件添加后缀。
I have created a class ParallelTimedRotatingFileHandler mainly aimed at allowing multiple processes writing in parallel to a log file. The problems with parallel processes solved by this class, are:
Service that you supply in the handler, logging does not go to e.g. Service.log but today to Service.2014-08-18.log and tomorrow Service.2014-08-19.log. a (append) mode instead of w to allow parallel writes.logging module is not foreseen for parallel processes, and I should use SocketHandler, but at least in my environment, this works.The code is just a slight variation of the code in the standard Python handlers.py module. Of course copyright to the copyright holders.
Here is the code:
import logging
import logging.handlers
import os
import time
import re
class ParallelTimedRotatingFileHandler(logging.handlers.TimedRotatingFileHandler):
def __init__(self, filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False, postfix = ".log"):
self.origFileName = filename
self.when = when.upper()
self.interval = interval
self.backupCount = backupCount
self.utc = utc
self.postfix = postfix
if self.when == 'S':
self.interval = 1 # one second
self.suffix = "%Y-%m-%d_%H-%M-%S"
self.extMatch = r"^\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2}$"
elif self.when == 'M':
self.interval = 60 # one minute
self.suffix = "%Y-%m-%d_%H-%M"
self.extMatch = r"^\d{4}-\d{2}-\d{2}_\d{2}-\d{2}$"
elif self.when == 'H':
self.interval = 60 * 60 # one hour
self.suffix = "%Y-%m-%d_%H"
self.extMatch = r"^\d{4}-\d{2}-\d{2}_\d{2}$"
elif self.when == 'D' or self.when == 'MIDNIGHT':
self.interval = 60 * 60 * 24 # one day
self.suffix = "%Y-%m-%d"
self.extMatch = r"^\d{4}-\d{2}-\d{2}$"
elif self.when.startswith('W'):
self.interval = 60 * 60 * 24 * 7 # one week
if len(self.when) != 2:
raise ValueError("You must specify a day for weekly rollover from 0 to 6 (0 is Monday): %s" % self.when)
if self.when[1] < '0' or self.when[1] > '6':
raise ValueError("Invalid day specified for weekly rollover: %s" % self.when)
self.dayOfWeek = int(self.when[1])
self.suffix = "%Y-%m-%d"
self.extMatch = r"^\d{4}-\d{2}-\d{2}$"
else:
raise ValueError("Invalid rollover interval specified: %s" % self.when)
currenttime = int(time.time())
logging.handlers.BaseRotatingHandler.__init__(self, self.calculateFileName(currenttime), 'a', encoding, delay)
self.extMatch = re.compile(self.extMatch)
self.interval = self.interval * interval # multiply by units requested
self.rolloverAt = self.computeRollover(currenttime)
def calculateFileName(self, currenttime):
if self.utc:
timeTuple = time.gmtime(currenttime)
else:
timeTuple = time.localtime(currenttime)
return self.origFileName + "." + time.strftime(self.suffix, timeTuple) + self.postfix
def getFilesToDelete(self, newFileName):
dirName, fName = os.path.split(self.origFileName)
dName, newFileName = os.path.split(newFileName)
fileNames = os.listdir(dirName)
result = []
prefix = fName + "."
postfix = self.postfix
prelen = len(prefix)
postlen = len(postfix)
for fileName in fileNames:
if fileName[:prelen] == prefix and fileName[-postlen:] == postfix and len(fileName)-postlen > prelen and fileName != newFileName:
suffix = fileName[prelen:len(fileName)-postlen]
if self.extMatch.match(suffix):
result.append(os.path.join(dirName, fileName))
result.sort()
if len(result) < self.backupCount:
result = []
else:
result = result[:len(result) - self.backupCount]
return result
def doRollover(self):
if self.stream:
self.stream.close()
self.stream = None
currentTime = self.rolloverAt
newFileName = self.calculateFileName(currentTime)
newBaseFileName = os.path.abspath(newFileName)
self.baseFilename = newBaseFileName
self.mode = 'a'
self.stream = self._open()
if self.backupCount > 0:
for s in self.getFilesToDelete(newFileName):
try:
os.remove(s)
except:
pass
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:
dstNow = time.localtime(currentTime)[-1]
dstAtRollover = time.localtime(newRolloverAt)[-1]
if dstNow != dstAtRollover:
if not dstNow: # DST kicks in before next rollover, so we need to deduct an hour
newRolloverAt = newRolloverAt - 3600
else: # DST bows out before next rollover, so we need to add an hour
newRolloverAt = newRolloverAt + 3600
self.rolloverAt = newRolloverAt
据我所知，没有办法直接实现这一点。
您可以尝试的一种解决方案是覆盖默认行为。
TimedRotatingFileHandler class并覆盖doRollover() function. <PythonInstallDir>/Lib/logging/handlers.py像这样的东西：
class MyTimedRotatingFileHandler(TimedRotatingFileHandler):
def __init__(self, **kwargs):
TimedRotatingFileHandler.__init__(self, **kwargs)
def doRollover(self):
# Do your stuff, rename the file as you want
这是一个简单的解决方案：将自定义命名器函数添加到处理程序。日志实用程序将调用您的命名器函数来创建滚动文件的名称，正如 Jester 最初在 6 年前（！）使用 filename.log.YYYYMMDD 所指出的那样，因此我们需要将 .log 部分“移动”到末尾：
def namer(name):
return name.replace(".log", "") + ".log"
然后在你设置你的处理程序之后，只需将你的函数分配给它的 namer 属性：
handler.namer = namer
这是我的完整日志初始化脚本，我是 python 新手，欢迎批评/建议：
import os
import logging
from logging.handlers import TimedRotatingFileHandler
from config import constants
def namer(name):
return name.replace(".log", "") + ".log"
def init(baseFilename):
logPath = constants.LOGGING_DIR
envSuffix = '-prod' if constants.ENV == 'prod' else '-dev'
logFilename = os.path.join(logPath, baseFilename + envSuffix + '.log')
print(f"Logging to {logFilename}")
handler = TimedRotatingFileHandler(logFilename,
when = "midnight",
backupCount = 30,
encoding = 'utf8')
handler.setLevel(logging.DEBUG)
handler.suffix = "%Y%m%d"
handler.namer = namer # <-- Here's where I assign the custom namer.
formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s [%(module)s:%(lineno)d]')
handler.setFormatter(formatter)
logging.basicConfig(
handlers = [handler],
format = '%(asctime)s %(levelname)s %(message)s [%(module)s:%(lineno)d]',
level = logging.DEBUG,
datefmt = '%Y-%m-%d %H:%M:%S')
if __name__ == '__main__':
init('testing')
logging.error("ohai")
logging.debug("ohai debug")
logging.getLogger().handlers[0].doRollover()
logging.error("ohai next day")
logging.debug("ohai debug next day")
我在 Python 3.7 中使用了解决方案https://stackoverflow.com/a/25387192/6619512 ，这是一个很好的解决方案。
但是对于“午夜”参数和以“W”开头的参数时，它不起作用，因为在TimedRotatingFileHandler 类中引入并使用了atTime参数。
要使用此解决方案，请使用以下 __init__ 行：
def __init__(self, filename, when='h', interval=1, backupCount=0,
encoding=None, delay=False, utc=False, atTime=None, postfix = ".log"):
还将以下内容添加到 __init__ 声明的内容中：
self.postfix = postfix