572 lines
20 KiB
Python
572 lines
20 KiB
Python
# 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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import logging
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from typing import Any, Dict, List, Optional, Tuple
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from twisted.internet.protocol import Protocol
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from twisted.web.resource import Resource
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from synapse.app.generic_worker import GenericWorkerServer
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from synapse.http.site import SynapseRequest, SynapseSite
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from synapse.replication.http import ReplicationRestResource
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from synapse.replication.tcp.client import ReplicationDataHandler
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from synapse.replication.tcp.handler import ReplicationCommandHandler
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from synapse.replication.tcp.protocol import ClientReplicationStreamProtocol
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from synapse.replication.tcp.resource import (
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ReplicationStreamProtocolFactory,
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ServerReplicationStreamProtocol,
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)
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from synapse.server import HomeServer
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from tests import unittest
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from tests.server import FakeTransport
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try:
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import hiredis
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except ImportError:
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hiredis = None # type: ignore
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logger = logging.getLogger(__name__)
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class BaseStreamTestCase(unittest.HomeserverTestCase):
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"""Base class for tests of the replication streams"""
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# hiredis is an optional dependency so we don't want to require it for running
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# the tests.
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if not hiredis:
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skip = "Requires hiredis"
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def prepare(self, reactor, clock, hs):
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# build a replication server
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server_factory = ReplicationStreamProtocolFactory(hs)
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self.streamer = hs.get_replication_streamer()
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self.server: ServerReplicationStreamProtocol = server_factory.buildProtocol(
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None
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)
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# Make a new HomeServer object for the worker
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self.reactor.lookups["testserv"] = "1.2.3.4"
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self.worker_hs = self.setup_test_homeserver(
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federation_http_client=None,
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homeserver_to_use=GenericWorkerServer,
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config=self._get_worker_hs_config(),
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reactor=self.reactor,
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)
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# Since we use sqlite in memory databases we need to make sure the
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# databases objects are the same.
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self.worker_hs.get_datastore().db_pool = hs.get_datastore().db_pool
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# Normally we'd pass in the handler to `setup_test_homeserver`, which would
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# eventually hit "Install @cache_in_self attributes" in tests/utils.py.
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# Unfortunately our handler wants a reference to the homeserver. That leaves
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# us with a chicken-and-egg problem.
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# We can workaround this: create the homeserver first, create the handler
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# and bodge it in after the fact. The bodging requires us to know the
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# dirty details of how `cache_in_self` works. We politely ask mypy to
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# ignore our dirty dealings.
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self.test_handler = self._build_replication_data_handler()
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self.worker_hs._replication_data_handler = self.test_handler # type: ignore[attr-defined]
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repl_handler = ReplicationCommandHandler(self.worker_hs)
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self.client = ClientReplicationStreamProtocol(
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self.worker_hs,
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"client",
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"test",
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clock,
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repl_handler,
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)
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self._client_transport = None
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self._server_transport = None
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def create_resource_dict(self) -> Dict[str, Resource]:
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d = super().create_resource_dict()
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d["/_synapse/replication"] = ReplicationRestResource(self.hs)
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return d
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def _get_worker_hs_config(self) -> dict:
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config = self.default_config()
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config["worker_app"] = "synapse.app.generic_worker"
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config["worker_replication_host"] = "testserv"
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config["worker_replication_http_port"] = "8765"
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return config
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def _build_replication_data_handler(self):
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return TestReplicationDataHandler(self.worker_hs)
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def reconnect(self):
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if self._client_transport:
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self.client.close()
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if self._server_transport:
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self.server.close()
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self._client_transport = FakeTransport(self.server, self.reactor)
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self.client.makeConnection(self._client_transport)
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self._server_transport = FakeTransport(self.client, self.reactor)
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self.server.makeConnection(self._server_transport)
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def disconnect(self):
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if self._client_transport:
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self._client_transport = None
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self.client.close()
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if self._server_transport:
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self._server_transport = None
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self.server.close()
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def replicate(self):
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"""Tell the master side of replication that something has happened, and then
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wait for the replication to occur.
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"""
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self.streamer.on_notifier_poke()
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self.pump(0.1)
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def handle_http_replication_attempt(self) -> SynapseRequest:
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"""Asserts that a connection attempt was made to the master HS on the
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HTTP replication port, then proxies it to the master HS object to be
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handled.
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Returns:
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The request object received by master HS.
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"""
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# We should have an outbound connection attempt.
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clients = self.reactor.tcpClients
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self.assertEqual(len(clients), 1)
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(host, port, client_factory, _timeout, _bindAddress) = clients.pop(0)
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self.assertEqual(host, "1.2.3.4")
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self.assertEqual(port, 8765)
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# Set up client side protocol
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client_protocol = client_factory.buildProtocol(None)
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# Set up the server side protocol
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channel = self.site.buildProtocol(None)
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# hook into the channel's request factory so that we can keep a record
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# of the requests
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requests: List[SynapseRequest] = []
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real_request_factory = channel.requestFactory
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def request_factory(*args, **kwargs):
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request = real_request_factory(*args, **kwargs)
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requests.append(request)
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return request
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channel.requestFactory = request_factory
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# Connect client to server and vice versa.
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client_to_server_transport = FakeTransport(
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channel, self.reactor, client_protocol
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)
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client_protocol.makeConnection(client_to_server_transport)
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server_to_client_transport = FakeTransport(
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client_protocol, self.reactor, channel
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)
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channel.makeConnection(server_to_client_transport)
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# The request will now be processed by `self.site` and the response
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# streamed back.
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self.reactor.advance(0)
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# We tear down the connection so it doesn't get reused without our
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# knowledge.
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server_to_client_transport.loseConnection()
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client_to_server_transport.loseConnection()
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# there should have been exactly one request
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self.assertEqual(len(requests), 1)
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return requests[0]
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def assert_request_is_get_repl_stream_updates(
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self, request: SynapseRequest, stream_name: str
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):
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"""Asserts that the given request is a HTTP replication request for
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fetching updates for given stream.
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"""
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path: bytes = request.path # type: ignore
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self.assertRegex(
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path,
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br"^/_synapse/replication/get_repl_stream_updates/%s/[^/]+$"
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% (stream_name.encode("ascii"),),
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)
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self.assertEqual(request.method, b"GET")
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class BaseMultiWorkerStreamTestCase(unittest.HomeserverTestCase):
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"""Base class for tests running multiple workers.
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Automatically handle HTTP replication requests from workers to master,
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unlike `BaseStreamTestCase`.
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"""
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def setUp(self):
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super().setUp()
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# build a replication server
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self.server_factory = ReplicationStreamProtocolFactory(self.hs)
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self.streamer = self.hs.get_replication_streamer()
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# Fake in memory Redis server that servers can connect to.
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self._redis_server = FakeRedisPubSubServer()
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# We may have an attempt to connect to redis for the external cache already.
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self.connect_any_redis_attempts()
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store = self.hs.get_datastore()
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self.database_pool = store.db_pool
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self.reactor.lookups["testserv"] = "1.2.3.4"
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self.reactor.lookups["localhost"] = "127.0.0.1"
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# A map from a HS instance to the associated HTTP Site to use for
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# handling inbound HTTP requests to that instance.
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self._hs_to_site = {self.hs: self.site}
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if self.hs.config.redis.redis_enabled:
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# Handle attempts to connect to fake redis server.
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self.reactor.add_tcp_client_callback(
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"localhost",
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6379,
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self.connect_any_redis_attempts,
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)
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self.hs.get_tcp_replication().start_replication(self.hs)
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# When we see a connection attempt to the master replication listener we
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# automatically set up the connection. This is so that tests don't
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# manually have to go and explicitly set it up each time (plus sometimes
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# it is impossible to write the handling explicitly in the tests).
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#
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# Register the master replication listener:
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self.reactor.add_tcp_client_callback(
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"1.2.3.4",
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8765,
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lambda: self._handle_http_replication_attempt(self.hs, 8765),
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)
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def create_test_resource(self):
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"""Overrides `HomeserverTestCase.create_test_resource`."""
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# We override this so that it automatically registers all the HTTP
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# replication servlets, without having to explicitly do that in all
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# subclassses.
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resource = ReplicationRestResource(self.hs)
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for servlet in self.servlets:
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servlet(self.hs, resource)
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return resource
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def make_worker_hs(
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self, worker_app: str, extra_config: Optional[dict] = None, **kwargs
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) -> HomeServer:
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"""Make a new worker HS instance, correctly connecting replcation
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stream to the master HS.
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Args:
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worker_app: Type of worker, e.g. `synapse.app.federation_sender`.
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extra_config: Any extra config to use for this instances.
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**kwargs: Options that get passed to `self.setup_test_homeserver`,
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useful to e.g. pass some mocks for things like `federation_http_client`
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Returns:
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The new worker HomeServer instance.
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"""
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config = self._get_worker_hs_config()
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config["worker_app"] = worker_app
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config.update(extra_config or {})
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worker_hs = self.setup_test_homeserver(
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homeserver_to_use=GenericWorkerServer,
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config=config,
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reactor=self.reactor,
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**kwargs,
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)
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# If the instance is in the `instance_map` config then workers may try
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# and send HTTP requests to it, so we register it with
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# `_handle_http_replication_attempt` like we do with the master HS.
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instance_name = worker_hs.get_instance_name()
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instance_loc = worker_hs.config.worker.instance_map.get(instance_name)
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if instance_loc:
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# Ensure the host is one that has a fake DNS entry.
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if instance_loc.host not in self.reactor.lookups:
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raise Exception(
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"Host does not have an IP for instance_map[%r].host = %r"
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% (
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instance_name,
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instance_loc.host,
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)
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)
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# Copy the port into a new, non-Optional variable so mypy knows we're
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# not going to reset `instance_loc` to `None` under its feet. See
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# https://mypy.readthedocs.io/en/latest/common_issues.html#narrowing-and-inner-functions
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port = instance_loc.port
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self.reactor.add_tcp_client_callback(
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self.reactor.lookups[instance_loc.host],
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instance_loc.port,
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lambda: self._handle_http_replication_attempt(worker_hs, port),
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)
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store = worker_hs.get_datastore()
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store.db_pool._db_pool = self.database_pool._db_pool
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# Set up TCP replication between master and the new worker if we don't
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# have Redis support enabled.
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if not worker_hs.config.redis.redis_enabled:
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repl_handler = ReplicationCommandHandler(worker_hs)
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client = ClientReplicationStreamProtocol(
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worker_hs,
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"client",
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"test",
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self.clock,
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repl_handler,
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)
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server = self.server_factory.buildProtocol(None)
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client_transport = FakeTransport(server, self.reactor)
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client.makeConnection(client_transport)
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server_transport = FakeTransport(client, self.reactor)
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server.makeConnection(server_transport)
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# Set up a resource for the worker
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resource = ReplicationRestResource(worker_hs)
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for servlet in self.servlets:
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servlet(worker_hs, resource)
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self._hs_to_site[worker_hs] = SynapseSite(
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logger_name="synapse.access.http.fake",
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site_tag="{}-{}".format(
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worker_hs.config.server.server_name, worker_hs.get_instance_name()
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),
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config=worker_hs.config.server.listeners[0],
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resource=resource,
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server_version_string="1",
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max_request_body_size=4096,
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reactor=self.reactor,
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)
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if worker_hs.config.redis.redis_enabled:
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worker_hs.get_tcp_replication().start_replication(worker_hs)
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return worker_hs
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def _get_worker_hs_config(self) -> dict:
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config = self.default_config()
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config["worker_replication_host"] = "testserv"
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config["worker_replication_http_port"] = "8765"
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return config
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def replicate(self):
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"""Tell the master side of replication that something has happened, and then
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wait for the replication to occur.
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"""
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self.streamer.on_notifier_poke()
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self.pump()
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def _handle_http_replication_attempt(self, hs, repl_port):
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"""Handles a connection attempt to the given HS replication HTTP
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listener on the given port.
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"""
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# We should have at least one outbound connection attempt, where the
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# last is one to the HTTP repication IP/port.
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clients = self.reactor.tcpClients
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self.assertGreaterEqual(len(clients), 1)
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(host, port, client_factory, _timeout, _bindAddress) = clients.pop()
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self.assertEqual(host, "1.2.3.4")
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self.assertEqual(port, repl_port)
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# Set up client side protocol
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client_protocol = client_factory.buildProtocol(None)
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# Set up the server side protocol
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channel = self._hs_to_site[hs].buildProtocol(None)
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# Connect client to server and vice versa.
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client_to_server_transport = FakeTransport(
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channel, self.reactor, client_protocol
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)
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client_protocol.makeConnection(client_to_server_transport)
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server_to_client_transport = FakeTransport(
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client_protocol, self.reactor, channel
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)
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channel.makeConnection(server_to_client_transport)
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# Note: at this point we've wired everything up, but we need to return
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# before the data starts flowing over the connections as this is called
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# inside `connecTCP` before the connection has been passed back to the
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# code that requested the TCP connection.
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def connect_any_redis_attempts(self):
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"""If redis is enabled we need to deal with workers connecting to a
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redis server. We don't want to use a real Redis server so we use a
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fake one.
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"""
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clients = self.reactor.tcpClients
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while clients:
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(host, port, client_factory, _timeout, _bindAddress) = clients.pop(0)
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self.assertEqual(host, "localhost")
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self.assertEqual(port, 6379)
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client_protocol = client_factory.buildProtocol(None)
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server_protocol = self._redis_server.buildProtocol(None)
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client_to_server_transport = FakeTransport(
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server_protocol, self.reactor, client_protocol
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)
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client_protocol.makeConnection(client_to_server_transport)
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server_to_client_transport = FakeTransport(
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client_protocol, self.reactor, server_protocol
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)
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server_protocol.makeConnection(server_to_client_transport)
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class TestReplicationDataHandler(ReplicationDataHandler):
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"""Drop-in for ReplicationDataHandler which just collects RDATA rows"""
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def __init__(self, hs: HomeServer):
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super().__init__(hs)
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# list of received (stream_name, token, row) tuples
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self.received_rdata_rows: List[Tuple[str, int, Any]] = []
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async def on_rdata(self, stream_name, instance_name, token, rows):
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await super().on_rdata(stream_name, instance_name, token, rows)
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for r in rows:
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self.received_rdata_rows.append((stream_name, token, r))
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class FakeRedisPubSubServer:
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"""A fake Redis server for pub/sub."""
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def __init__(self):
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self._subscribers = set()
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def add_subscriber(self, conn):
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"""A connection has called SUBSCRIBE"""
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self._subscribers.add(conn)
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def remove_subscriber(self, conn):
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"""A connection has called UNSUBSCRIBE"""
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self._subscribers.discard(conn)
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def publish(self, conn, channel, msg) -> int:
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"""A connection want to publish a message to subscribers."""
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for sub in self._subscribers:
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sub.send(["message", channel, msg])
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return len(self._subscribers)
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def buildProtocol(self, addr):
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return FakeRedisPubSubProtocol(self)
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class FakeRedisPubSubProtocol(Protocol):
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"""A connection from a client talking to the fake Redis server."""
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transport: Optional[FakeTransport] = None
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def __init__(self, server: FakeRedisPubSubServer):
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self._server = server
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self._reader = hiredis.Reader()
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def dataReceived(self, data):
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self._reader.feed(data)
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# We might get multiple messages in one packet.
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while True:
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msg = self._reader.gets()
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if msg is False:
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# No more messages.
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return
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if not isinstance(msg, list):
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# Inbound commands should always be a list
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raise Exception("Expected redis list")
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self.handle_command(msg[0], *msg[1:])
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def handle_command(self, command, *args):
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"""Received a Redis command from the client."""
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# We currently only support pub/sub.
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if command == b"PUBLISH":
|
|
channel, message = args
|
|
num_subscribers = self._server.publish(self, channel, message)
|
|
self.send(num_subscribers)
|
|
elif command == b"SUBSCRIBE":
|
|
(channel,) = args
|
|
self._server.add_subscriber(self)
|
|
self.send(["subscribe", channel, 1])
|
|
|
|
# Since we use SET/GET to cache things we can safely no-op them.
|
|
elif command == b"SET":
|
|
self.send("OK")
|
|
elif command == b"GET":
|
|
self.send(None)
|
|
else:
|
|
raise Exception("Unknown command")
|
|
|
|
def send(self, msg):
|
|
"""Send a message back to the client."""
|
|
assert self.transport is not None
|
|
|
|
raw = self.encode(msg).encode("utf-8")
|
|
|
|
self.transport.write(raw)
|
|
self.transport.flush()
|
|
|
|
def encode(self, obj):
|
|
"""Encode an object to its Redis format.
|
|
|
|
Supports: strings/bytes, integers and list/tuples.
|
|
"""
|
|
|
|
if isinstance(obj, bytes):
|
|
# We assume bytes are just unicode strings.
|
|
obj = obj.decode("utf-8")
|
|
|
|
if obj is None:
|
|
return "$-1\r\n"
|
|
if isinstance(obj, str):
|
|
return f"${len(obj)}\r\n{obj}\r\n"
|
|
if isinstance(obj, int):
|
|
return f":{obj}\r\n"
|
|
if isinstance(obj, (list, tuple)):
|
|
items = "".join(self.encode(a) for a in obj)
|
|
return f"*{len(obj)}\r\n{items}"
|
|
|
|
raise Exception("Unrecognized type for encoding redis: %r: %r", type(obj), obj)
|
|
|
|
def connectionLost(self, reason):
|
|
self._server.remove_subscriber(self)
|