# -*- coding: utf-8 -*-
# Copyright 2017 Vector Creations Ltd
# Copyright 2019 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from collections import namedtuple

from ._base import Stream

FederationStreamRow = namedtuple(
    "FederationStreamRow",
    (
        "type",  # str, the type of data as defined in the BaseFederationRows
        "data",  # dict, serialization of a federation.send_queue.BaseFederationRow
    ),
)


class FederationStream(Stream):
    """Data to be sent over federation. Only available when master has federation
    sending disabled.
    """

    NAME = "federation"
    ROW_TYPE = FederationStreamRow

    def __init__(self, hs):
        federation_sender = hs.get_federation_sender()

        self.current_token = federation_sender.get_current_token
        self.update_function = federation_sender.get_replication_rows

        super(FederationStream, self).__init__(hs)
