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# -*- 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 twisted.internet import defer
from synapse.replication.tcp.streams._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
_QUERY_MASTER = True
def __init__(self, hs):
# Not all synapse instances will have a federation sender instance,
# whether that's a `FederationSender` or a `FederationRemoteSendQueue`,
# so we stub the stream out when that is the case.
if hs.config.worker_app is None or hs.should_send_federation():
federation_sender = hs.get_federation_sender()
self.current_token = federation_sender.get_current_token # type: ignore
self.update_function = federation_sender.get_replication_rows # type: ignore
else:
self.current_token = lambda: 0 # type: ignore
self.update_function = lambda *args, **kwargs: defer.succeed([]) # type: ignore
super(FederationStream, self).__init__(hs)
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