from __future__ import annotations


class DuplicateBindingException(Exception):
    def __init__(self, channel_type: str, account_id: str, group_id: str):
        self.channel_type = channel_type
        self.account_id = account_id
        self.group_id = group_id
        super().__init__(f"binding already exists: {channel_type}/{account_id}/{group_id}")