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 os
import threading
import queue
import time
import datetime
import logging
from logging.handlers import RotatingFileHandler

class 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 = 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)

    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 sys
import os
import time
import threading

if __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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