a python logging Handler that writes events to MongoDB

#!/usr/bin/env python
import logging
import pymongo
import datetime


class MongoHandler(logging.Handler):
    """
    A logging handler that will record messages to a (optionally capped)
    MongoDB collection.

    >>> connection = pymongo.Connection()
    >>> collection = connection.db.log
    >>> logger = logging.getLogger("mongotest")
    >>> logger.addHandler(MongoHandler(drop=True))
    >>> logger.error("Hello, world!")
    >>> collection.find_one()['message']
    u'Hello, world!'
    """

    def __init__(self, level=logging.NOTSET, host="localhost", port=27017,
                 database='db', collection='log', capped=True, size=100000,
                 drop=False):
        logging.Handler.__init__(self, level)
        self.connection = pymongo.Connection(host, port)
        self.database = self.connection[database]

        if collection in self.database.collection_names():
            if drop:
                self.database.drop_collection(collection)
                self.collection = self.database.create_collection(
                    collection, {'capped': capped, 'size': size})
            else:
                self.collection = self.database[collection]
        else:
            self.collection = self.database.create_collection(
                collection, {'capped': capped, 'size': size})

    def emit(self, record):
        self.collection.save({'when': datetime.datetime.now(),
                              'levelno': record.levelno,
                              'levelname': record.levelname,
                              'message': record.msg})


if __name__ == '__main__':
    import doctest
    doctest.testmod()