anonymousland-synapse/tests/replication/tcp/streams/_base.py
Richard van der Hoff c2e1a2110f
Fix limit logic for EventsStream (#7358)
* Factor out functions for injecting events into database

I want to add some more flexibility to the tools for injecting events into the
database, and I don't want to clutter up HomeserverTestCase with them, so let's
factor them out to a new file.

* Rework TestReplicationDataHandler

This wasn't very easy to work with: the mock wrapping was largely superfluous,
and it's useful to be able to inspect the received rows, and clear out the
received list.

* Fix AssertionErrors being thrown by EventsStream

Part of the problem was that there was an off-by-one error in the assertion,
but also the limit logic was too simple. Fix it all up and add some tests.
2020-04-29 12:30:36 +01:00

312 lines
10 KiB
Python

# -*- coding: utf-8 -*-
# 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.
import logging
from typing import Any, Dict, List, Optional, Tuple
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.slave.storage._base import BaseSlavedStore
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 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)
# 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 = self._build_replication_data_handler()
self.worker_hs.replication_data_handler = self.test_handler
repl_handler = ReplicationCommandHandler(self.worker_hs)
self.client = ClientReplicationStreamProtocol(
self.worker_hs, "client", "test", clock, repl_handler,
)
self._client_transport = None
self._server_transport = None
def _build_replication_data_handler(self):
return TestReplicationDataHandler(self.worker_hs.get_datastore())
def reconnect(self):
if self._client_transport:
self.client.close()
if self._server_transport:
self.server.close()
self._client_transport = FakeTransport(self.server, self.reactor)
self.client.makeConnection(self._client_transport)
self._server_transport = FakeTransport(self.client, self.reactor)
self.server.makeConnection(self._server_transport)
def disconnect(self):
if self._client_transport:
self._client_transport = None
self.client.close()
if self._server_transport:
self._server_transport = None
self.server.close()
def replicate(self):
"""Tell the master side of replication that something has happened, and then
wait for the replication to occur.
"""
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.
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, store: BaseSlavedStore):
super().__init__(store)
# streams to subscribe to: map from stream id to position
self.stream_positions = {} # type: Dict[str, int]
# list of received (stream_name, token, row) tuples
self.received_rdata_rows = [] # type: List[Tuple[str, int, Any]]
def get_streams_to_replicate(self):
return self.stream_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))
if (
stream_name in self.stream_positions
and token > self.stream_positions[stream_name]
):
self.stream_positions[stream_name] = token
@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 # type: Optional[_PullToPushProducer]
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()