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

importos

importthreading

importqueue

importtime

importdatetime

importlogging

fromlogging.handlers importRotatingFileHandler

 

classlogging2(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 =module

 

print("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)

 

iflogLevel =='DEBUG':

self.logger.setLevel(level =logging.DEBUG)

self.rHandler.setLevel(logging.DEBUG)

self.console.setLevel(logging.DEBUG)

eliflogLevel =='INFO':

self.logger.setLevel(level =logging.INFO)

self.rHandler.setLevel(logging.INFO)

self.console.setLevel(logging.INFO)

eliflogLevel =='WARNING':

self.logger.setLevel(level =logging.WARN)

self.rHandler.setLevel(logging.WARN)

self.console.setLevel(logging.WARN)

eliflogLevel =='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

defreSetLog(self):

AdtTemp =datetime.datetime.now().strftime('%Y%m%d')

#比较新的时间

ifAdtTemp ==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

 

defrun(self):

print("开启日志线程："+self.name)

i =0

whileTrue:

#data = "queue test data"

#debug(data)

#print("Queuesize: %s" % (logging2.AQueue.qsize()))

self.reSetLog()

iflogging2.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('|'))

iflevel =='DEBUG':

self.logger.debug(*lstContent)

eliflevel =='INFO':

self.logger.info(*lstContent)

eliflevel =='WARNING':

self.logger.warn(*lstContent)

eliflevel =='ERROR':

self.logger.error(*lstContent)

else:

time.sleep(0.5)

 

print("退出线程："+self.name)

 

defdebug(*content):

logMsg =""

#传入多个参数用竖线分隔符分开

fori inrange(len(content)):

ifi ==len(content)-1:

logMsg +=content[i]

else:

logMsg +=content[i]+"|"

logging2.AQueue.put({'DEBUG':logMsg})

 

definfo(*content):

logMsg =""

fori inrange(len(content)):

ifi ==len(content)-1:

logMsg +=content[i]

else:

logMsg +=content[i]+"|"

logging2.AQueue.put({'INFO':logMsg})

 

defwarn(*content):

logMsg =""

fori inrange(len(content)):

ifi ==len(content)-1:

logMsg +=content[i]

else:

logMsg +=content[i]+"|"

logging2.AQueue.put({'WARNING':logMsg})

 

deferror(*content):

logMsg =""

fori inrange(len(content)):

ifi ==len(content)-1:

logMsg +=content[i]

else:

logMsg +=content[i]+"|"

logging2.AQueue.put({'ERROR':logMsg})

 

definit(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

importsys

importos

importtime

importthreading

 

if__name__ =='__main__':

importlogging2

logging2.init("logMain", "DEBUG")

 

teststr ="22222"

 

whileTrue:

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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