Python日志:自定义输出字段 json格式输出

最近有一个需求:将日志以json格式输出, 并且有些字段是logging模块没有的.看了很多源码和资料, 终于搞定, 抽取精华分享出来, 一起成长.

import json
import logging


class JsonFilter(logging.Filter):

    ip = 'IP'
    source = 'APP'

    def filter(self, record):
        record.ip = self.ip
        record.username = self.source
        return True


if __name__ == '__main__':

    formate = json.dumps({
        "time": "%(asctime)s",
        "levelname": "%(levelname)s",
        "levelno": "%(lineno)d",
        "ip": "%(ip)s",
        "source": "%(source)s"
    })
    logging.basicConfig(level=logging.DEBUG,
                        format=formate)
    logger = logging.getLogger()
    filter_ = JsonFilter()
    logger.addFilter(filter_)

    logger.debug('A debug message')

    filter_.ip = '127.0.0.1'
    filter_.source= 'china'
    logger.info('A message for test')

运行结果:

其实就是重写了logging.Filter的filter方法,自定义需要的字段, 在调用日志输出时,赋予相应的值即可.不赋予相应的值时也可以输出日志, 会自动按照定义字段时的信息输出.