Rotating-logger

日志文件太大，一般不容易使用。現在的日志系統一般都提供了方便的日志回繞分片。一般有按照文件大小、記錄時間長度來對日志文件分片。
在python logging中，提供了這2種分片方式。

按照文件大小分片

這種方式使用的Handler是RotatingFileHandler；

class RotatingFileHandler(BaseRotatingHandler):"""Handler for logging to a set of files, which switches from one fileto the next when the current file reaches a certain size."""def __init__(self, filename, mode='a', maxBytes=0, backupCount=0, encoding=None, delay=0):

下面看看使用方式：

rlogger = logging.getLogger("loggingtest2") rfh = RotatingFileHandler("log/rtest.log", maxBytes=2000,backupCount=3)formatter = logging.Formatter('%(name)-12s %(asctime)s.%(msecs)03d %(levelname)-8s %(message)s', datefmt='%Y-%m-%d,%H:%M:%S') rfh.setFormatter(formatter)rlogger.addHandler(rfh)

完整示例：

import sys,time import logging from logging.handlers import RotatingFileHandler,TimedRotatingFileHandlerrlogger = logging.getLogger("loggingtest2") rfh = RotatingFileHandler("log/rtest.log", maxBytes=2000,backupCount=3)formatter = logging.Formatter('%(name)-12s %(asctime)s.%(msecs)03d %(levelname)-8s %(message)s', datefmt='%Y-%m-%d,%H:%M:%S') rfh.setFormatter(formatter)rlogger.addHandler(rfh)rlogger.setLevel(level = logging.INFO)i = 0 while i<2000:rlogger.info("this is a %s %i.......","info",i)rlogger.warning("this is a %s %i........", "warning",i)i=i+1

執行時，會在log下生成rtest.log，以及分片的3個backup文件rtest.log.0, rtest.log.1, rtest.log.2

按照時間長度分片

這里使用的是TimedRotatingFileHandler。

定義如下：

class TimedRotatingFileHandler(BaseRotatingHandler):"""Handler for logging to a file, rotating the log file at certain timedintervals.If backupCount is > 0, when rollover is done, no more than backupCountfiles are kept - the oldest ones are deleted."""def __init__(self, filename, when='h', interval=1, backupCount=0, encoding=None, delay=False, utc=False):

使用方式：

formatter = logging.Formatter('%(name)-12s %(asctime)s.%(msecs)03d %(levelname)-8s %(message)s', datefmt='%Y-%m-%d,%H:%M:%S') trlogger = logging.getLogger() trfh = TimedRotatingFileHandler("log/tr_test.log",when="S",interval=5,backupCount=3)trfh.setFormatter(formatter) trlogger.addHandler(trfh)

完整示例：

import sys,time import logging from logging.handlers import RotatingFileHandler,TimedRotatingFileHandlerformatter = logging.Formatter('%(name)-12s %(asctime)s.%(msecs)03d %(levelname)-8s %(message)s', datefmt='%Y-%m-%d,%H:%M:%S') trlogger = logging.getLogger() trfh = TimedRotatingFileHandler("log/tr_test.log",when="S",interval=5,backupCount=3)trfh.setFormatter(formatter) trlogger.addHandler(trfh)trlogger.setLevel(level = logging.INFO)i=0 while i < 500:trlogger.info("this is a %s .......","info")trlogger.warning("this is a %s........", "warning")time.sleep(0.5)i=i+1

總結

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