def get_docs_to_commit(self):
        try:
            spec = {'synced': False}
            fields = {'_id': 0}
            cur = self.db.docs.find(spec, fields)
        except Exception as e:
            raise DatabaseException(e)
        return list(cur)
def encode(self):
        if self.version == 6:
            return {'ip6': self.ip_addr}
        else:
            return {'ip4': self.ip_addr}