python-daemon和日志:以交互方式设置日志级别
我有一个python守护进程，它通过ThreadedTCPServer (灵感来自食谱示例：https://docs.python.org/2/howto/logging-cookbook.html#sending-and-receiving-logging-events-across-a-network )记录到一个文件中，因为我将有许多这样的进程写入到同一个文件中。我从ipython控制台使用subprocess.Popen控制守护进程的生成，这就是应用程序的运行方式。我能够成功地从主ipython进程和守护进程写入日志文件，但我无法通过简单地在ipython中设置根记录器的级别来更改这两者的级别。这是应该成为可能的事情吗？或者需要自定义功能来单独设置守护进程的logging.level？
编辑:根据要求，这里尝试提供我正在尝试实现的伪代码示例。我希望这是一个足够的描述。
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，我会运行下面这样的代码
>>> 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处理这个问题，但是，我不清楚什么方法能更好地工作。任何建议都将不胜感激。
回答 1
Stack Overflow用户
发布于 2018-08-06 08:11:37
在守护进程中创建的记录器与在ipython中创建的记录器不同。您可以通过打印两个记录器对象本身来测试这一点，这将显示它们的内存地址。
我认为一个更好的模式是，当你运行守护进程时，无论你想不想处于"debug“模式，你都可以通过。换句话说，像这样调用popen：
subprocess.Popen( ["python" , "daemon_script.py", "debug"] )你可以像上面那样传递一个表示“调试模式开启”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)
然后在守护进程的init函数中使用argv，例如，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)
...https://stackoverflow.com/questions/51698157
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