logs.py 文件源码

def get_logfile_from_logger(logger=logging.root):
    """Return the file object of the first FileHandler of a given logger.

    This can be used as shorthand for redirecting the low-level stderr
    file descriptor to a log file after daemonization.

    Example usage:
        nav.daemon.daemonize('/var/run/nav/mydaemon.pid',
                             stderr=get_logfile_from_logger())

    Arguments:
        ``logger'' the logger object whose first FileHandler's file will be
                   returned.  If omitted, the root logger is searched for a
                   FileHandler.

    Returns:
        A file object, or None if no FileHandlers were found.

    """
    for handler in logger.handlers:
        if isinstance(handler, logging.FileHandler):
            return handler.stream