Respect the @cancellable flag for DirectServe{Html,Json}Resources (#12698)

`DirectServeHtmlResource` and `DirectServeJsonResource` both inherit
from `_AsyncResource`. These classes expect to be subclassed with
`_async_render_*` methods.

This commit has no effect on `JsonResource`, despite inheriting from
`_AsyncResource`. `JsonResource` has its own `_async_render` override
which will need to be updated separately.

Signed-off-by: Sean Quah <seanq@element.io>
This commit is contained in:
Sean Quah 2022-05-11 12:24:48 +01:00 committed by GitHub
parent a4c75918b3
commit dffecade7d
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3 changed files with 112 additions and 2 deletions

1
changelog.d/12698.misc Normal file
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@ -0,0 +1 @@
Respect the `@cancellable` flag for `DirectServe{Html,Json}Resource`s.

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@ -382,6 +382,8 @@ class _AsyncResource(resource.Resource, metaclass=abc.ABCMeta):
method_handler = getattr(self, "_async_render_%s" % (request_method,), None)
if method_handler:
request.is_render_cancellable = is_method_cancellable(method_handler)
raw_callback_return = method_handler(request)
# Is it synchronous? We'll allow this for now.

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@ -13,18 +13,28 @@
# limitations under the License.
import re
from http import HTTPStatus
from typing import Tuple
from twisted.internet.defer import Deferred
from twisted.web.resource import Resource
from synapse.api.errors import Codes, RedirectException, SynapseError
from synapse.config.server import parse_listener_def
from synapse.http.server import DirectServeHtmlResource, JsonResource, OptionsResource
from synapse.http.site import SynapseSite
from synapse.http.server import (
DirectServeHtmlResource,
DirectServeJsonResource,
JsonResource,
OptionsResource,
cancellable,
)
from synapse.http.site import SynapseRequest, SynapseSite
from synapse.logging.context import make_deferred_yieldable
from synapse.types import JsonDict
from synapse.util import Clock
from tests import unittest
from tests.http.server._base import EndpointCancellationTestHelperMixin
from tests.server import (
FakeSite,
ThreadedMemoryReactorClock,
@ -363,3 +373,100 @@ class WrapHtmlRequestHandlerTests(unittest.TestCase):
self.assertEqual(channel.result["code"], b"200")
self.assertNotIn("body", channel.result)
class CancellableDirectServeJsonResource(DirectServeJsonResource):
def __init__(self, clock: Clock):
super().__init__()
self.clock = clock
@cancellable
async def _async_render_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
await self.clock.sleep(1.0)
return HTTPStatus.OK, {"result": True}
async def _async_render_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
await self.clock.sleep(1.0)
return HTTPStatus.OK, {"result": True}
class CancellableDirectServeHtmlResource(DirectServeHtmlResource):
ERROR_TEMPLATE = "{code} {msg}"
def __init__(self, clock: Clock):
super().__init__()
self.clock = clock
@cancellable
async def _async_render_GET(self, request: SynapseRequest) -> Tuple[int, bytes]:
await self.clock.sleep(1.0)
return HTTPStatus.OK, b"ok"
async def _async_render_POST(self, request: SynapseRequest) -> Tuple[int, bytes]:
await self.clock.sleep(1.0)
return HTTPStatus.OK, b"ok"
class DirectServeJsonResourceCancellationTests(EndpointCancellationTestHelperMixin):
"""Tests for `DirectServeJsonResource` cancellation."""
def setUp(self):
self.reactor = ThreadedMemoryReactorClock()
self.clock = Clock(self.reactor)
self.resource = CancellableDirectServeJsonResource(self.clock)
self.site = FakeSite(self.resource, self.reactor)
def test_cancellable_disconnect(self) -> None:
"""Test that handlers with the `@cancellable` flag can be cancelled."""
channel = make_request(
self.reactor, self.site, "GET", "/sleep", await_result=False
)
self._test_disconnect(
self.reactor,
channel,
expect_cancellation=True,
expected_body={"error": "Request cancelled", "errcode": Codes.UNKNOWN},
)
def test_uncancellable_disconnect(self) -> None:
"""Test that handlers without the `@cancellable` flag cannot be cancelled."""
channel = make_request(
self.reactor, self.site, "POST", "/sleep", await_result=False
)
self._test_disconnect(
self.reactor,
channel,
expect_cancellation=False,
expected_body={"result": True},
)
class DirectServeHtmlResourceCancellationTests(EndpointCancellationTestHelperMixin):
"""Tests for `DirectServeHtmlResource` cancellation."""
def setUp(self):
self.reactor = ThreadedMemoryReactorClock()
self.clock = Clock(self.reactor)
self.resource = CancellableDirectServeHtmlResource(self.clock)
self.site = FakeSite(self.resource, self.reactor)
def test_cancellable_disconnect(self) -> None:
"""Test that handlers with the `@cancellable` flag can be cancelled."""
channel = make_request(
self.reactor, self.site, "GET", "/sleep", await_result=False
)
self._test_disconnect(
self.reactor,
channel,
expect_cancellation=True,
expected_body=b"499 Request cancelled",
)
def test_uncancellable_disconnect(self) -> None:
"""Test that handlers without the `@cancellable` flag cannot be cancelled."""
channel = make_request(
self.reactor, self.site, "POST", "/sleep", await_result=False
)
self._test_disconnect(
self.reactor, channel, expect_cancellation=False, expected_body=b"ok"
)