mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-10-01 08:25:44 -04:00
116 lines
3.6 KiB
Python
116 lines
3.6 KiB
Python
# Copyright 2016 OpenMarket 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.
|
|
|
|
from twisted.internet import defer
|
|
from twisted.internet.defer import Deferred
|
|
|
|
from synapse.util.async_helpers import ReadWriteLock
|
|
|
|
from tests import unittest
|
|
|
|
|
|
class ReadWriteLockTestCase(unittest.TestCase):
|
|
def _assert_called_before_not_after(self, lst, first_false):
|
|
for i, d in enumerate(lst[:first_false]):
|
|
self.assertTrue(d.called, msg="%d was unexpectedly false" % i)
|
|
|
|
for i, d in enumerate(lst[first_false:]):
|
|
self.assertFalse(
|
|
d.called, msg="%d was unexpectedly true" % (i + first_false)
|
|
)
|
|
|
|
def test_rwlock(self):
|
|
rwlock = ReadWriteLock()
|
|
|
|
key = object()
|
|
|
|
ds = [
|
|
rwlock.read(key), # 0
|
|
rwlock.read(key), # 1
|
|
rwlock.write(key), # 2
|
|
rwlock.write(key), # 3
|
|
rwlock.read(key), # 4
|
|
rwlock.read(key), # 5
|
|
rwlock.write(key), # 6
|
|
]
|
|
ds = [defer.ensureDeferred(d) for d in ds]
|
|
|
|
self._assert_called_before_not_after(ds, 2)
|
|
|
|
with ds[0].result:
|
|
self._assert_called_before_not_after(ds, 2)
|
|
self._assert_called_before_not_after(ds, 2)
|
|
|
|
with ds[1].result:
|
|
self._assert_called_before_not_after(ds, 2)
|
|
self._assert_called_before_not_after(ds, 3)
|
|
|
|
with ds[2].result:
|
|
self._assert_called_before_not_after(ds, 3)
|
|
self._assert_called_before_not_after(ds, 4)
|
|
|
|
with ds[3].result:
|
|
self._assert_called_before_not_after(ds, 4)
|
|
self._assert_called_before_not_after(ds, 6)
|
|
|
|
with ds[5].result:
|
|
self._assert_called_before_not_after(ds, 6)
|
|
self._assert_called_before_not_after(ds, 6)
|
|
|
|
with ds[4].result:
|
|
self._assert_called_before_not_after(ds, 6)
|
|
self._assert_called_before_not_after(ds, 7)
|
|
|
|
with ds[6].result:
|
|
pass
|
|
|
|
d = defer.ensureDeferred(rwlock.write(key))
|
|
self.assertTrue(d.called)
|
|
with d.result:
|
|
pass
|
|
|
|
d = defer.ensureDeferred(rwlock.read(key))
|
|
self.assertTrue(d.called)
|
|
with d.result:
|
|
pass
|
|
|
|
def test_lock_handoff_to_nonblocking_writer(self):
|
|
"""Test a writer handing the lock to another writer that completes instantly."""
|
|
rwlock = ReadWriteLock()
|
|
key = "key"
|
|
|
|
unblock: "Deferred[None]" = Deferred()
|
|
|
|
async def blocking_write():
|
|
with await rwlock.write(key):
|
|
await unblock
|
|
|
|
async def nonblocking_write():
|
|
with await rwlock.write(key):
|
|
pass
|
|
|
|
d1 = defer.ensureDeferred(blocking_write())
|
|
d2 = defer.ensureDeferred(nonblocking_write())
|
|
self.assertFalse(d1.called)
|
|
self.assertFalse(d2.called)
|
|
|
|
# Unblock the first writer. The second writer will complete without blocking.
|
|
unblock.callback(None)
|
|
self.assertTrue(d1.called)
|
|
self.assertTrue(d2.called)
|
|
|
|
# The `ReadWriteLock` should operate as normal.
|
|
d3 = defer.ensureDeferred(nonblocking_write())
|
|
self.assertTrue(d3.called)
|