Python logging模块异步线程写日志实现过程解析

通过logging模块，重写一个logging2模块，独立开启线程，将待写的日志信息异步放入队列，做到日志输出不影响主流程性能，环境python3.8

logging2.py

import osimport threadingimport queueimport timeimport datetimeimport loggingfrom logging.handlers import RotatingFileHandlerclass logging2(threading.Thread): AQueue = queue.Queue(100000) nPID = os.getpid() Adt = datetime.datetime.now().strftime(’%Y%m%d’) nCount = 1 def __init__(self, threadID, name, module, logLevel): threading.Thread.__init__(self) self.threadID = threadID self.name = name self.module = moduleprint('set loglevel: [%s]' % (logLevel) ) formatter = logging.Formatter(’%(asctime)s|%(name)s|%(process)d|%(levelname)s|%(message)s’) logfile = 'log_' + self.module + '_' + str(logging2.nPID) + '_' + str(logging2.Adt) + '.log' self.logger = logging.getLogger(__name__)self.rHandler = RotatingFileHandler(logfile, maxBytes = 10*1024*1024, backupCount = 10) self.rHandler.setFormatter(formatter)self.console = logging.StreamHandler() self.console.setFormatter(formatter)if logLevel == ’DEBUG’ : self.logger.setLevel(level = logging.DEBUG) self.rHandler.setLevel(logging.DEBUG) self.console.setLevel(logging.DEBUG) elif logLevel == ’INFO’ : self.logger.setLevel(level = logging.INFO) self.rHandler.setLevel(logging.INFO) self.console.setLevel(logging.INFO) elif logLevel == ’WARNING’ : self.logger.setLevel(level = logging.WARN) self.rHandler.setLevel(logging.WARN) self.console.setLevel(logging.WARN) elif logLevel == ’ERROR’ : self.logger.setLevel(level = logging.ERROR) self.rHandler.setLevel(logging.ERROR) self.console.setLevel(logging.ERROR)self.logger.addHandler(self.rHandler) self.logger.addHandler(self.console) #如果跨天了，则重新生成新的文件名 def reSetLog(self): AdtTemp = datetime.datetime.now().strftime(’%Y%m%d’) #比较新的时间 if AdtTemp == logging2.Adt: return(True) logging2.Adt = AdtTemp logfile = 'log_' + self.module + '_' + str(logging2.nPID) + '_' + str(AdtTemp) + '.log' self.rHandler = RotatingFileHandler(logfile, maxBytes = 1*1024, backupCount = 10)self.logger.addHandler(self.rHandler) self.logger.addHandler(self.console) logging2.nCount += 1 def run(self): print ('开启日志线程：' + self.name) i = 0 while True: #data = 'queue test data' #debug(data) #print('Queuesize: %s' % (logging2.AQueue.qsize())) self.reSetLog() if logging2.AQueue.empty() == False:#从队列获取日志消息data = logging2.AQueue.get()#解析日志消息，格式：日志级别，内容level = list(data.keys())[0]content = data.get(level)#把内容按分隔符|解析成list传入参数lstContent = list(content.split(’|’))if level == ’DEBUG’ : self.logger.debug(*lstContent)elif level == ’INFO’ : self.logger.info(*lstContent)elif level == ’WARNING’ : self.logger.warn(*lstContent)elif level == ’ERROR’ : self.logger.error(*lstContent) else:time.sleep(0.5) print ('退出线程：' + self.name) def debug(*content): logMsg = '' #传入多个参数用竖线分隔符分开 for i in range(len(content)): if i == len(content)-1: logMsg += content[i] else: logMsg += content[i]+'|' logging2.AQueue.put({’DEBUG’:logMsg}) def info(*content): logMsg = '' for i in range(len(content)): if i == len(content)-1: logMsg += content[i] else: logMsg += content[i]+'|' logging2.AQueue.put({’INFO’:logMsg})def warn(*content): logMsg = '' for i in range(len(content)): if i == len(content)-1: logMsg += content[i] else: logMsg += content[i]+'|' logging2.AQueue.put({’WARNING’:logMsg}) def error(*content): logMsg = '' for i in range(len(content)): if i == len(content)-1: logMsg += content[i] else: logMsg += content[i]+'|' logging2.AQueue.put({’ERROR’:logMsg}) def init(module, level): # 创建新线程 thread1 = logging2(1, 'Thread-log', module, level) # 开启新线程 thread1.start()# thread1.join()

测试桩logMain.py

import sysimport osimport timeimport threadingif __name__ == ’__main__’: import logging2 logging2.init('logMain', 'DEBUG') teststr = '22222' while True: logging2.debug(’this is a debug log test [%s] ’, teststr) logging2.info(’this is a info log test [%s] [%s]’, teststr, teststr) logging2.warn(’this is a warn log test’) logging2.error(’this is a error log test’) #time.sleep(0.1) print(threading.enumerate()) print(’press ctrl_c to exit’)

测试结果

生成日志文件：

-rw-rw-r--. 1 zxl zxl 10152463 6月 24 17:52 log_logMain_57554_20200624.log

文件内容如下：

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