用gevent(或封装了gevent的gunicore)启动python进程,会出现多个独立进程同时写一个日志文件,
可以观察到有日志部分丢失:一个进程日志没写完,另一个进程把日志覆盖在同一行的后面;有些日志甚至完全丢失。
用mlogging包可以解决多进程写日志的问题,没有发现不完整的日志,是否丢失日志有待进一步检测。
下面是一个在python程序中记录重要信息,以便以后解析统计的函数
# -*- coding: utf-8 -*- import os.path import logging from mlogging import FileHandler_MP, TimedRotatingFileHandler_MP from functools import partial class LevelFilter(logging.Filter): def __init__(self, level, *args, **kwargs): #super(LevelFilter, self).__init__(*args, **kwargs) self.level = level def filter(self, record): return record.levelno == self.level def init_info_logger(name, logging_dir): logging_file = os.path.join(logging_dir, name+".log") handler = TimedRotatingFileHandler_MP(logging_file, "midnight", 1) handler.setFormatter( logging.Formatter( "%(asctime)s %(levelname)-8s %(name)-20s %(message)s", #设置日志格式,固定宽度便于解析 datefmt = "%Y-%m-%d %H:%M:%S" #设置asctime时间格式 )) handler.suffix = "%Y%m%d" #只记录INFO级别信息,抛弃上面的WARNING、ERROR、CRITICAL几个级别 handler.addFilter( LevelFilter(logging.INFO) ) logger = logging.getLogger(name) logger.setLevel(logging.INFO) #有些Python版本会报错KeyError,找不到clientip或user,这里用一个短横(-)做默认值 extra={"clientip":"-", "user":"-"} #exc_info是出错时的Debug详细回溯信息,这里禁止记录,只记录错误信息这一行 setattr(logger, "info", partial(logger.info, exc_info=False, extra=extra)) logger.addHandler( handler ) return logger def init_error_logger(logging_dir): logging_file = os.path.join(logging_dir, "errors.log") handler = FileHandler_MP(logging_file) handler.setFormatter( logging.Formatter( "%(asctime)s %(levelname)-8s %(message)s", #设置日志格式,固定宽度便于解析 datefmt = "%Y-%m-%d %H:%M:%S" #设置asctime时间格式 )) logger = logging.getLogger() logger.setLevel(logging.WARNING) #有些Python版本会报错KeyError,找不到clientip或user,这里用一个短横(-)做默认值 extra={"clientip":"-", "user":"-"} #exc_info是出错时的Debug详细回溯信息 setattr(logger, "critical", partial(logger.critical, exc_info=True, extra=extra)) setattr(logger, "error", partial(logger.error, exc_info=True, extra=extra)) setattr(logger, "warning", partial(logger.warning, exc_info=True, extra=extra)) logger.addHandler( handler ) return logger if __name__ == "__main__": logger = init_info_logger("test", "./") logger.debug("低级别的DEBUG,不会记录。") logger.info("哈哈哈,这才是我想要的信息,请记下来。") logger.error("高级别的ERROR,也被过滤掉。")