Add some replication tests (#7278)

Specifically some tests for the typing stream, which means we test streams that fetch missing updates via HTTP (rather than via the DB).

We also shuffle things around a bit so that we create two separate `HomeServer` objects, rather than trying to insert a slaved store into places.

Note: `test_typing.py` is heavily inspired by `test_receipts.py`
This commit is contained in:
Erik Johnston 2020-04-28 17:42:03 +01:00 committed by GitHub
parent ce207aa0ff
commit fce663889b
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3 changed files with 299 additions and 11 deletions

1
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Add some unit tests for replication.

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# 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.
import logging
from typing import Optional
from mock import Mock
import attr
from twisted.internet.interfaces import IConsumer, IPullProducer, IReactorTime
from twisted.internet.task import LoopingCall
from twisted.web.http import HTTPChannel
from synapse.app.generic_worker import GenericWorkerServer
from synapse.http.site import SynapseRequest
from synapse.replication.tcp.client import ReplicationDataHandler
from synapse.replication.tcp.handler import ReplicationCommandHandler
from synapse.replication.tcp.protocol import ClientReplicationStreamProtocol
from synapse.replication.tcp.resource import ReplicationStreamProtocolFactory
from synapse.util import Clock
from tests import unittest
from tests.server import FakeTransport
logger = logging.getLogger(__name__)
class BaseStreamTestCase(unittest.HomeserverTestCase):
"""Base class for tests of the replication streams"""
def make_homeserver(self, reactor, clock):
self.test_handler = Mock(wraps=TestReplicationDataHandler())
return self.setup_test_homeserver(replication_data_handler=self.test_handler)
def prepare(self, reactor, clock, hs):
# build a replication server
server_factory = ReplicationStreamProtocolFactory(hs)
self.streamer = hs.get_replication_streamer()
self.server = server_factory.buildProtocol(None)
repl_handler = ReplicationCommandHandler(hs)
repl_handler.handler = self.test_handler
# Make a new HomeServer object for the worker
config = self.default_config()
config["worker_app"] = "synapse.app.generic_worker"
config["worker_replication_host"] = "testserv"
config["worker_replication_http_port"] = "8765"
self.reactor.lookups["testserv"] = "1.2.3.4"
self.worker_hs = self.setup_test_homeserver(
http_client=None,
homeserverToUse=GenericWorkerServer,
config=config,
reactor=self.reactor,
)
# Since we use sqlite in memory databases we need to make sure the
# databases objects are the same.
self.worker_hs.get_datastore().db = hs.get_datastore().db
self.test_handler = Mock(
wraps=TestReplicationDataHandler(self.worker_hs.get_datastore())
)
self.worker_hs.replication_data_handler = self.test_handler
repl_handler = ReplicationCommandHandler(self.worker_hs)
self.client = ClientReplicationStreamProtocol(
hs, "client", "test", clock, repl_handler,
self.worker_hs, "client", "test", clock, repl_handler,
)
self._client_transport = None
@ -74,11 +107,75 @@ class BaseStreamTestCase(unittest.HomeserverTestCase):
self.streamer.on_notifier_poke()
self.pump(0.1)
def handle_http_replication_attempt(self) -> SynapseRequest:
"""Asserts that a connection attempt was made to the master HS on the
HTTP replication port, then proxies it to the master HS object to be
handled.
class TestReplicationDataHandler:
Returns:
The request object received by master HS.
"""
# We should have an outbound connection attempt.
clients = self.reactor.tcpClients
self.assertEqual(len(clients), 1)
(host, port, client_factory, _timeout, _bindAddress) = clients.pop(0)
self.assertEqual(host, "1.2.3.4")
self.assertEqual(port, 8765)
# Set up client side protocol
client_protocol = client_factory.buildProtocol(None)
request_factory = OneShotRequestFactory()
# Set up the server side protocol
channel = _PushHTTPChannel(self.reactor)
channel.requestFactory = request_factory
channel.site = self.site
# Connect client to server and vice versa.
client_to_server_transport = FakeTransport(
channel, self.reactor, client_protocol
)
client_protocol.makeConnection(client_to_server_transport)
server_to_client_transport = FakeTransport(
client_protocol, self.reactor, channel
)
channel.makeConnection(server_to_client_transport)
# The request will now be processed by `self.site` and the response
# streamed back.
self.reactor.advance(0)
# We tear down the connection so it doesn't get reused without our
# knowledge.
server_to_client_transport.loseConnection()
client_to_server_transport.loseConnection()
return request_factory.request
def assert_request_is_get_repl_stream_updates(
self, request: SynapseRequest, stream_name: str
):
"""Asserts that the given request is a HTTP replication request for
fetching updates for given stream.
"""
self.assertRegex(
request.path,
br"^/_synapse/replication/get_repl_stream_updates/%s/[^/]+$"
% (stream_name.encode("ascii"),),
)
self.assertEqual(request.method, b"GET")
class TestReplicationDataHandler(ReplicationDataHandler):
"""Drop-in for ReplicationDataHandler which just collects RDATA rows"""
def __init__(self):
def __init__(self, hs):
super().__init__(hs)
self.streams = set()
self._received_rdata_rows = []
@ -90,8 +187,118 @@ class TestReplicationDataHandler:
return positions
async def on_rdata(self, stream_name, token, rows):
await super().on_rdata(stream_name, token, rows)
for r in rows:
self._received_rdata_rows.append((stream_name, token, r))
async def on_position(self, stream_name, token):
pass
@attr.s()
class OneShotRequestFactory:
"""A simple request factory that generates a single `SynapseRequest` and
stores it for future use. Can only be used once.
"""
request = attr.ib(default=None)
def __call__(self, *args, **kwargs):
assert self.request is None
self.request = SynapseRequest(*args, **kwargs)
return self.request
class _PushHTTPChannel(HTTPChannel):
"""A HTTPChannel that wraps pull producers to push producers.
This is a hack to get around the fact that HTTPChannel transparently wraps a
pull producer (which is what Synapse uses to reply to requests) with
`_PullToPush` to convert it to a push producer. Unfortunately `_PullToPush`
uses the standard reactor rather than letting us use our test reactor, which
makes it very hard to test.
"""
def __init__(self, reactor: IReactorTime):
super().__init__()
self.reactor = reactor
self._pull_to_push_producer = None
def registerProducer(self, producer, streaming):
# Convert pull producers to push producer.
if not streaming:
self._pull_to_push_producer = _PullToPushProducer(
self.reactor, producer, self
)
producer = self._pull_to_push_producer
super().registerProducer(producer, True)
def unregisterProducer(self):
if self._pull_to_push_producer:
# We need to manually stop the _PullToPushProducer.
self._pull_to_push_producer.stop()
class _PullToPushProducer:
"""A push producer that wraps a pull producer.
"""
def __init__(
self, reactor: IReactorTime, producer: IPullProducer, consumer: IConsumer
):
self._clock = Clock(reactor)
self._producer = producer
self._consumer = consumer
# While running we use a looping call with a zero delay to call
# resumeProducing on given producer.
self._looping_call = None # type: Optional[LoopingCall]
# We start writing next reactor tick.
self._start_loop()
def _start_loop(self):
"""Start the looping call to
"""
if not self._looping_call:
# Start a looping call which runs every tick.
self._looping_call = self._clock.looping_call(self._run_once, 0)
def stop(self):
"""Stops calling resumeProducing.
"""
if self._looping_call:
self._looping_call.stop()
self._looping_call = None
def pauseProducing(self):
"""Implements IPushProducer
"""
self.stop()
def resumeProducing(self):
"""Implements IPushProducer
"""
self._start_loop()
def stopProducing(self):
"""Implements IPushProducer
"""
self.stop()
self._producer.stopProducing()
def _run_once(self):
"""Calls resumeProducing on producer once.
"""
try:
self._producer.resumeProducing()
except Exception:
logger.exception("Failed to call resumeProducing")
try:
self._consumer.unregisterProducer()
except Exception:
pass
self.stopProducing()

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@ -0,0 +1,80 @@
# -*- coding: utf-8 -*-
# Copyright 2020 The Matrix.org Foundation C.I.C.
#
# 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 synapse.handlers.typing import RoomMember
from synapse.replication.http import streams
from synapse.replication.tcp.streams import TypingStream
from tests.replication.tcp.streams._base import BaseStreamTestCase
USER_ID = "@feeling:blue"
class TypingStreamTestCase(BaseStreamTestCase):
servlets = [
streams.register_servlets,
]
def test_typing(self):
typing = self.hs.get_typing_handler()
room_id = "!bar:blue"
self.reconnect()
# make the client subscribe to the receipts stream
self.test_handler.streams.add("typing")
typing._push_update(member=RoomMember(room_id, USER_ID), typing=True)
self.reactor.advance(0)
# We should now see an attempt to connect to the master
request = self.handle_http_replication_attempt()
self.assert_request_is_get_repl_stream_updates(request, "typing")
self.test_handler.on_rdata.assert_called_once()
stream_name, token, rdata_rows = self.test_handler.on_rdata.call_args[0]
self.assertEqual(stream_name, "typing")
self.assertEqual(1, len(rdata_rows))
row = rdata_rows[0] # type: TypingStream.TypingStreamRow
self.assertEqual(room_id, row.room_id)
self.assertEqual([USER_ID], row.user_ids)
# Now let's disconnect and insert some data.
self.disconnect()
self.test_handler.on_rdata.reset_mock()
typing._push_update(member=RoomMember(room_id, USER_ID), typing=False)
self.test_handler.on_rdata.assert_not_called()
self.reconnect()
self.pump(0.1)
# We should now see an attempt to connect to the master
request = self.handle_http_replication_attempt()
self.assert_request_is_get_repl_stream_updates(request, "typing")
# The from token should be the token from the last RDATA we got.
self.assertEqual(int(request.args[b"from_token"][0]), token)
self.test_handler.on_rdata.assert_called_once()
stream_name, token, rdata_rows = self.test_handler.on_rdata.call_args[0]
self.assertEqual(stream_name, "typing")
self.assertEqual(1, len(rdata_rows))
row = rdata_rows[0] # type: TypingStream.TypingStreamRow
self.assertEqual(room_id, row.room_id)
self.assertEqual([], row.user_ids)