Environment-based logger

handler.py

from logging import FileHandler as BaseFileHandler
import os


class EnvFileHandler(BaseFileHandler):
    """
    Custom filehandler that uses the LOG_ROOT setting to determine the folder
    to store log files in.
    
    We have to do some tricky stuff to avoid circular imports.  To this end, 
    we pass /dev/null to the parent handler but specify opening to be delayed. 
    Then when we try to first open the file, we join the LOG_ROOT with the
    passed filename.
    """
    
    def __init__(self, filename, *args, **kwargs):
        self.filename = filename
        kwargs['delay'] = True
        BaseFileHandler.__init__(self, "/dev/null", *args, **kwargs)
        
    def _open(self):
        from django.conf import settings
        self.baseFilename = os.path.join(settings.LOG_ROOT, self.filename)
        return BaseFileHandler._open(self)