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4cff617df1
This changes the replication protocol so that the server does not send down `RDATA` for rows that happened before the client connected. Instead, the server will send a `POSITION` and clients then query the database (or master out of band) to get up to date.
53 lines
2.1 KiB
Python
53 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 Vector Creations Ltd
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# Copyright 2019 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from collections import namedtuple
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from twisted.internet import defer
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from synapse.replication.tcp.streams._base import Stream, db_query_to_update_function
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class FederationStream(Stream):
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"""Data to be sent over federation. Only available when master has federation
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sending disabled.
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"""
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FederationStreamRow = namedtuple(
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"FederationStreamRow",
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(
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"type", # str, the type of data as defined in the BaseFederationRows
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"data", # dict, serialization of a federation.send_queue.BaseFederationRow
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),
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)
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NAME = "federation"
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ROW_TYPE = FederationStreamRow
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_QUERY_MASTER = True
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def __init__(self, hs):
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# Not all synapse instances will have a federation sender instance,
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# whether that's a `FederationSender` or a `FederationRemoteSendQueue`,
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# so we stub the stream out when that is the case.
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if hs.config.worker_app is None or hs.should_send_federation():
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federation_sender = hs.get_federation_sender()
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self.current_token = federation_sender.get_current_token # type: ignore
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self.update_function = db_query_to_update_function(federation_sender.get_replication_rows) # type: ignore
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else:
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self.current_token = lambda: 0 # type: ignore
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self.update_function = lambda from_token, upto_token, limit: defer.succeed(([], upto_token, bool)) # type: ignore
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super(FederationStream, self).__init__(hs)
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