如何在Python日志消息中将“ levelname”重命名为“ level”？

Question

我有一个如下所示的Python日志记录配置：

LOGGING_CONFIG:
    version: 1
    formatters:
        human:
            class: logging.Formatter
            format: '[%(asctime)s]:[%(levelname)s]: %(message)s'
        json:
            class: pythonjsonlogger.jsonlogger.JsonFormatter
            format: '%(asctime)s %(levelname)s %(message)s'
    handlers:
        console:
            class: logging.StreamHandler
            level: DEBUG
            formatter: json  # change this to 'human' when you run it locally, json in production
        file:
            class: logging.FileHandler
            filename: logfile.log
            level: DEBUG
            formatter: json
    root:  # Logging for 3rd party stuff
        level: INFO
        handlers:
            - console
            - file
    project_name:  # Logging this module
        level: DEBUG
        handlers:
            - console
            - file

对于另一个系统，我需要结构化日志具有一些固定名称。一个示例是它不应为levelname，而应为level。如何重命名日志字段？

我所拥有的：

{"asctime": "2018-10-22 14:50:19,923", "levelname": "info", "message": "foobar"}

我想要什么：

{"asctime": "2018-10-22 14:50:19,923", "level": "info", "message": "foobar"}

Answer 1

levelname不会出现在普通的Python记录器中，而是出现在您使用的自定义格式化程序中。据我了解，您可以使用以下片段来自定义其输出的字典：

class CustomJsonFormatter(jsonlogger.JsonFormatter):
    def add_fields(self, log_record, record, message_dict):
        super(CustomJsonFormatter, self).add_fields(log_record, record, message_dict)
        log_record['level'] = log_record['levelname']
        del log_record['levelname']

然后将pythonjsonlogger.jsonlogger.JsonFormatter替换为CustomJsonFormatter的地址。