Question

我有一个python-daemon进程，该进程通过ThreadedTCPServer登录到文件（受食谱示例的启发，https://docs.python.org/2/howto/logging-cookbook.html#sending-and-receiving-logging-events-across-a-network，因为我将有许多这样的进程写入同一文件）。我正在从ipython控制台使用subprocess.Popen控制守护进程的生成，这就是应用程序运行的方式。我能够从主要的ipython进程以及守护程序进程成功写入日志文件，但仅通过在ipython中设置根记录器的级别就无法更改两者的级别。这应该可行吗？还是需要自定义功能才能分别设置守护程序的logging.level？

编辑：根据要求，这是尝试提供我尝试实现的伪代码示例。我希望这是足够的描述。

daemon_script.py

import logging
import daemon 
from other_module import function_to_run_as_daemon

class daemon(object):
    def __init__(self):
         self.daemon_name = __name__
         logging.basicConfig()  # <--- required, or I don't get any log messages
         self.logger = logging.getLogger(self.daemon_name)
         self.logger.debug( "Created logger successfully" )

    def run(self):
        with daemon.daemonContext( files_preserve = [self.logger.handlers[0].stream] )
            self.logger.debug( "Daemonised successfully - about to enter function" )
            function_to_run_as_daemon()

if __name__ == "__main__":
    d = daemon()
    d.run()

然后在ipython中，我会运行类似的东西

>>> import logging
>>> rootlogger = logging.getLogger()
>>> rootlogger.info( "test" )
INFO:root:"test"
>>> subprocess.Popen( ["python" , "daemon_script.py"] )
DEBUG:__main__:"Created logger successfully"
DEBUG:__main__:"Daemonised successfully - about to enter function"
# now i'm finished debugging and testing, i want to reduce the level for all the loggers by changing the level of the handler
# Note that I also tried changing the level of the root handler, but saw no change
>>> rootlogger.handlers[0].setLevel(logging.INFO)
>>> rootlogger.info( "test" )
INFO:root:"test"
>>> print( rootlogger.debug("test") )
None
>>> subprocess.Popen( ["python" , "daemon_script.py"] )
DEBUG:__main__:"Created logger successfully"
DEBUG:__main__:"Daemonised successfully - about to enter function"

我认为我可能没有正确地解决这个问题，但是我不清楚哪种方法更好。任何意见，将不胜感激。

Answer 1

您在守护程序中创建的记录器与您在ipython中创建的记录器不同。您可以通过只打印两个记录器对象本身来进行测试，以确保它们的内存地址。

我认为更好的模式是在运行守护程序时是否要处于“调试”模式。换句话说，像这样调用popen：

subprocess.Popen( ["python" , "daemon_script.py", "debug"] )

完全由您决定，您可以像上面那样传递一个表示“调试模式已打开”的字符串，也可以传递表示“调试”的日志级别常量，例如： subprocess.Popen（[“ python”，“ daemon_script.py”，“ 10”]）（https://docs.python.org/2/library/logging.html#levels）

然后在守护程序的init函数中，例如使用argv来获取该参数并使用它：

...
import sys

def __init__(self):
     self.daemon_name = __name__
     logging.basicConfig()  # <--- required, or I don't get any log messages
     log_level = int(sys.argv[1])  # Probably don't actually just blindly convert it without error handling
     self.logger = logging.getLogger(self.daemon_name)
     self.logger.setLevel(log_level)
     ...

python-daemon和日志记录：以交互方式设置日志记录级别

1 个答案: