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Kill off _PushHTTPChannel. (#9878)
First of all, a fixup to `FakeChannel` which is needed to make it work with the default HTTP channel implementation. Secondly, it looks like we no longer need `_PushHTTPChannel`, because as of #8013, the producer that gets attached to the `HTTPChannel` is now an `IPushProducer`. This is good, because it means we can remove a whole load of test-specific boilerplate which causes variation between tests and production.
This commit is contained in:
Richard van der Hoff
GitHub
parent
695b73c861
commit
84936e2264
1
changelog.d/9878.misc
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changelog.d/9878.misc
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@ -0,0 +1 @@
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Remove redundant `_PushHTTPChannel` test class.
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@ -12,14 +12,10 @@
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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, Callable, Dict, List, Optional, Tuple, Type
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from typing import Any, Callable, Dict, List, Optional, Tuple
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from twisted.internet.interfaces import IConsumer, IPullProducer, IReactorTime
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from twisted.internet.protocol import Protocol
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from twisted.internet.task import LoopingCall
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from twisted.web.http import HTTPChannel
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from twisted.web.resource import Resource
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from twisted.web.server import Request, Site
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from synapse.app.generic_worker import GenericWorkerServer
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from synapse.http.server import JsonResource
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@ -33,7 +29,6 @@ from synapse.replication.tcp.resource import (
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ServerReplicationStreamProtocol,
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)
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from synapse.server import HomeServer
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from synapse.util import Clock
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from tests import unittest
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from tests.server import FakeTransport
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@ -154,7 +149,19 @@ class BaseStreamTestCase(unittest.HomeserverTestCase):
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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 = _PushHTTPChannel(self.reactor, SynapseRequest, self.site)
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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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@ -176,7 +183,10 @@ class BaseStreamTestCase(unittest.HomeserverTestCase):
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server_to_client_transport.loseConnection()
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client_to_server_transport.loseConnection()
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return channel.request
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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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@ -387,7 +397,7 @@ class BaseMultiWorkerStreamTestCase(unittest.HomeserverTestCase):
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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 = _PushHTTPChannel(self.reactor, SynapseRequest, self._hs_to_site[hs])
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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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@ -445,112 +455,6 @@ class TestReplicationDataHandler(ReplicationDataHandler):
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self.received_rdata_rows.append((stream_name, token, r))
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class _PushHTTPChannel(HTTPChannel):
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"""A HTTPChannel that wraps pull producers to push producers.
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This is a hack to get around the fact that HTTPChannel transparently wraps a
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pull producer (which is what Synapse uses to reply to requests) with
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`_PullToPush` to convert it to a push producer. Unfortunately `_PullToPush`
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uses the standard reactor rather than letting us use our test reactor, which
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makes it very hard to test.
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"""
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def __init__(
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self, reactor: IReactorTime, request_factory: Type[Request], site: Site
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):
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super().__init__()
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self.reactor = reactor
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self.requestFactory = request_factory
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self.site = site
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self._pull_to_push_producer = None # type: Optional[_PullToPushProducer]
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def registerProducer(self, producer, streaming):
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# Convert pull producers to push producer.
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if not streaming:
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self._pull_to_push_producer = _PullToPushProducer(
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self.reactor, producer, self
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)
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producer = self._pull_to_push_producer
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super().registerProducer(producer, True)
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def unregisterProducer(self):
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if self._pull_to_push_producer:
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# We need to manually stop the _PullToPushProducer.
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self._pull_to_push_producer.stop()
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def checkPersistence(self, request, version):
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"""Check whether the connection can be re-used"""
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# We hijack this to always say no for ease of wiring stuff up in
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# `handle_http_replication_attempt`.
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request.responseHeaders.setRawHeaders(b"connection", [b"close"])
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return False
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def requestDone(self, request):
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# Store the request for inspection.
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self.request = request
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super().requestDone(request)
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class _PullToPushProducer:
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"""A push producer that wraps a pull producer."""
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def __init__(
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self, reactor: IReactorTime, producer: IPullProducer, consumer: IConsumer
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):
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self._clock = Clock(reactor)
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self._producer = producer
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self._consumer = consumer
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# While running we use a looping call with a zero delay to call
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# resumeProducing on given producer.
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self._looping_call = None # type: Optional[LoopingCall]
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# We start writing next reactor tick.
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self._start_loop()
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def _start_loop(self):
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"""Start the looping call to"""
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if not self._looping_call:
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# Start a looping call which runs every tick.
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self._looping_call = self._clock.looping_call(self._run_once, 0)
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def stop(self):
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"""Stops calling resumeProducing."""
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if self._looping_call:
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self._looping_call.stop()
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self._looping_call = None
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def pauseProducing(self):
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"""Implements IPushProducer"""
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self.stop()
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def resumeProducing(self):
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"""Implements IPushProducer"""
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self._start_loop()
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def stopProducing(self):
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"""Implements IPushProducer"""
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self.stop()
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self._producer.stopProducing()
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def _run_once(self):
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"""Calls resumeProducing on producer once."""
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try:
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self._producer.resumeProducing()
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except Exception:
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logger.exception("Failed to call resumeProducing")
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try:
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self._consumer.unregisterProducer()
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except Exception:
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pass
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self.stopProducing()
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class FakeRedisPubSubServer:
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"""A fake Redis server for pub/sub."""
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@ -603,12 +603,6 @@ class FakeTransport:
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if self.disconnected:
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return
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if not hasattr(self.other, "transport"):
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# the other has no transport yet; reschedule
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if self.autoflush:
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self._reactor.callLater(0.0, self.flush)
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return
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if maxbytes is not None:
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to_write = self.buffer[:maxbytes]
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else:
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