python|python logging多进程多线程输出到同一个日志文件的实战案例 pythonlogging多进程多线程输出到

参考官方案例：https://docs.python.org/zh-cn/3.8/howto/logging-cookbook.html

import loggingimport logging.configimport logging.handlersfrom multiprocessing import Process, Queueimport randomimport threadingimport timedef logger_thread(q):while True:record = q.get()if record is None:breaklogger = logging.getLogger(record.name)logger.handle(record)def worker_process(q):qh = logging.handlers.QueueHandler(q)root = logging.getLogger()root.setLevel(logging.DEBUG)root.addHandler(qh)levels = [logging.DEBUG, logging.INFO, logging.WARNING, logging.ERROR,logging.CRITICAL]loggers = ['foo', 'foo.bar', 'foo.bar.baz','spam', 'spam.ham', 'spam.ham.eggs']for i in range(100):lvl = random.choice(levels)logger = logging.getLogger(random.choice(loggers))logger.log(lvl, 'Message no. %d', i)if __name__ == '__main__':q = Queue()d = {'version': 1,'formatters': {'detailed': {'class': 'logging.Formatter','format': '%(asctime)s %(name)-15s %(levelname)-8s %(processName)-10s %(message)s'}},'handlers': {'console': {'class': 'logging.StreamHandler','level': 'INFO',},'file': {'class': 'logging.FileHandler','filename': 'mplog.log','mode': 'w','formatter': 'detailed','foofile': {'filename': 'mplog-foo.log','errors': {'filename': 'mplog-errors.log','level': 'ERROR','loggers': {'foo': {'handlers': ['foofile']'root': {'level': 'DEBUG','handlers': ['console', 'file', 'errors']}workers = []for i in range(5):wp = Process(target=worker_process, name='worker %d' % (i + 1), args=(q,))workers.append(wp)wp.start()logging.config.dictConfig(d)lp = threading.Thread(target=logger_thread, args=(q,))lp.start()# At this point, the main process could do some useful work of its own# Once it's done that, it can wait for the workers to terminate...for wp in workers:wp.join()# And now tell the logging thread to finish up, tooq.put(None)lp.join()

实战案例：
1、字典形式配置日志

log_conf_dict = {'version': 1,'formatters': {'my_formatter': {'class': 'logging.Formatter','format': '%(asctime)s %(processName)s(%(process)d) %(threadName)s(%(thread)d) %(filename)s[line:%(lineno)d] %(levelname)s %(message)s'}},'handlers': {'console': {'class': 'logging.StreamHandler','level': 'INFO','formatter': 'my_formatter',},'file': {'class': 'logging.handlers.RotatingFileHandler','filename': '/log/test.log','maxBytes': 5*1024*1024,'backupCount': 60,'mode': 'w','delay': True,'formatter': 'my_formatter','encoding': 'utf-8','level': 'INFO',},},'loggers': {'my_logger': {'handlers': ['file']}},'root': {'level': _level,'handlers': ['console', 'file']},}

2、主进程中开启独立的日志写入监听线程

"""主进程中开启独立的日志写入监听线程"""queue = Queue(-1)logging.config.dictConfig(dict)log_thread = threading.Thread(target=logger_main, args=(queue,))log_thread.start()"""其他逻辑代码段"""queue.put(None)log_thread.join()

日志写入函数

def logger_main(q):'''日志队列写入文件'''while True:record = q.get()if record is None:breaklogger = logging.getLogger()logger.handle(record)

3、子进程中将日志输入QueueHandler日志队列

def child_proc_main(queue):lqh = logging.handlers.QueueHandler(queue)lqh.set_name("my_queue_handler")root = logging.getLogger()#很关键的一步，必须先清空，再加入。原因：多进程多线程复杂环境下，在window和linux平台运行表现不一致，linux会复制主进程的日志配置，造成同时输出多个日志文件。root.handlers.clear()root.addHandler(lqh)root.setLevel(level)

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