如何修改python LoggerAdapter

Question

我正在尝试使用LoggerAdapter修改python中的日志上下文。第一次设置为“系统启动前”。但随后的上下文修改并未生效。有人能解释为什么上下文字符串更改不生效吗

import logging
extra = {'proc_context': 'PRE_SYSTEM_BOOT'}
def get_logger():
    format_str="%(proc_context)s: %(message)s"
    logging.basicConfig(level=logging.DEBUG, format=format_str)
    logger = logging.getLogger(__name__)
    logger = logging.LoggerAdapter(logger, extra)
    return logger

if __name__ == "__main__":
    logger = get_logger()
    logging.LoggerAdapter(logger, extra)
    # preboot
    logger.debug("init context")
    # boot
    extra = {'proc_context': 'SYSTEM_BOOT'}
    logger = logging.LoggerAdapter(logger, extra)
    logger.debug("system contex")
    extra = {'proc_context': 'SYSTEM_POST_BOOT'}
    logger = logging.LoggerAdapter(logger, extra)
    #post boot
    logger.debug("system booted")

输出：

root@ubuntu-~# python python_log.py
PRE_SYSTEM_BOOT: init context
PRE_SYSTEM_BOOT: system contex
PRE_SYSTEM_BOOT: system booted
root@ubuntu-s-1vcpu-1gb-blr1-01:~# 

预期：

PRE_SYSTEM_BOOT: init context

SYSTEM_BOOT: system contex

POST_SYSTEM_BOOT: system booted

Answer 1

在设置记录器适配器之前，需要获取记录器实例：

import logging
extra = {'proc_context': 'PRE_SYSTEM_BOOT'}
def get_logger():
    format_str="%(proc_context)s: %(message)s"
    logging.basicConfig(level=logging.DEBUG, format=format_str)
    logger = logging.getLogger(__name__)
    logger = logging.LoggerAdapter(logger, extra)
    return logger

if __name__ == "__main__":
    logger = get_logger()
    # preboot
    logger.debug("init context")
    # boot
    logger = logging.getLogger(__name__)
    extra = {'proc_context': 'SYSTEM_BOOT'}
    logger = logging.LoggerAdapter(logger, extra)
    logger.debug("system contex")
    logger = logging.getLogger(__name__)
    extra = {'proc_context': 'SYSTEM_POST_BOOT'}
    logger = logging.LoggerAdapter(logger, extra)
    #post boot
    logger.debug("system booted")