import logging
from flask import Flask
from threading import Lock

# a lock used for logger initialization
_logger_lock = Lock()



class MyCustomLogger(object):
    def __init__(self, app):
         self.instance = logging.getLogger(self.app.name)
         # Initialize logging stuff, you can use app.config here

    def log_response(self, flask_response):
        # Can create/override logger stuff
        pass
    def __getattr__(self, name):
        """Forward any uncaught attributes to the instance object"""
        logger = self.instance
        if hasattr(logger, name):
            return getattr(logger, name)
        else:
            raise AttributeError('%s has no attribute "%s"' % (self, name))

class AltFlask(Flask):

    """Subclass of Flask to customize behavior.
    This class is meant to be used in application factories. It modifies the
    behavior of the following:
        1) Routing.
        2) Exception logging.
    Subclassing Flask becomes necessary when an application grows, so it is
    generally a good idea to do it from the start.
    """

    @property
    def logger(self):
        """Overrides the default logger property in Flask"""
        if self._logger and self._logger.name == self.logger_name:
            return self._logger
        with _logger_lock:
            if self._logger and self._logger.name == self.logger_name:
                return self._logger
            self._logger = rv = MyCustomLogger(self)
            return rv