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3eab76ad43
For direct TCP connections we need the master to relay REMOTE_SERVER_UP commands to the other connections so that all instances get notified about it. The old implementation just relayed to all connections, assuming that sending back to the original sender of the command was safe. This is not true for redis, where commands sent get echoed back to the sender, which was causing master to effectively infinite loop sending and then re-receiving REMOTE_SERVER_UP commands that it sent. The fix is to ensure that we only relay to *other* connections and not to the connection we received the notification from. Fixes #7334.
62 lines
2.1 KiB
Python
62 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2020 The Matrix.org Foundation C.I.C.
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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 typing import Tuple
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from twisted.internet.interfaces import IProtocol
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from twisted.test.proto_helpers import StringTransport
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from synapse.replication.tcp.resource import ReplicationStreamProtocolFactory
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from tests.unittest import HomeserverTestCase
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class RemoteServerUpTestCase(HomeserverTestCase):
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def prepare(self, reactor, clock, hs):
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self.factory = ReplicationStreamProtocolFactory(hs)
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def _make_client(self) -> Tuple[IProtocol, StringTransport]:
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"""Create a new direct TCP replication connection
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"""
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proto = self.factory.buildProtocol(("127.0.0.1", 0))
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transport = StringTransport()
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proto.makeConnection(transport)
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# We can safely ignore the commands received during connection.
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self.pump()
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transport.clear()
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return proto, transport
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def test_relay(self):
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"""Test that Synapse will relay REMOTE_SERVER_UP commands to all
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other connections, but not the one that sent it.
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"""
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proto1, transport1 = self._make_client()
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# We shouldn't receive an echo.
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proto1.dataReceived(b"REMOTE_SERVER_UP example.com\n")
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self.pump()
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self.assertEqual(transport1.value(), b"")
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# But we should see an echo if we connect another client
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proto2, transport2 = self._make_client()
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proto1.dataReceived(b"REMOTE_SERVER_UP example.com\n")
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self.pump()
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self.assertEqual(transport1.value(), b"")
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self.assertEqual(transport2.value(), b"REMOTE_SERVER_UP example.com\n")
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