22408f8da0
Change-Id: Ib3edfdd087ed1d954f1ecf72a191138f8f1c46a1 Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
119 lines
4.6 KiB
Python
119 lines
4.6 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import queue
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import time
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from unittest import mock
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from oslo_cache import _memcache_pool
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import testtools
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from testtools import matchers
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from keystonemiddleware.tests.unit import utils
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class _TestConnectionPool(_memcache_pool.ConnectionPool):
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destroyed_value = 'destroyed'
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def _create_connection(self):
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return mock.MagicMock()
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def _destroy_connection(self, conn):
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conn(self.destroyed_value)
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class TestConnectionPool(utils.TestCase):
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def setUp(self):
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super(TestConnectionPool, self).setUp()
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self.unused_timeout = 10
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self.maxsize = 2
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self.connection_pool = _TestConnectionPool(
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maxsize=self.maxsize,
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unused_timeout=self.unused_timeout)
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def test_get_context_manager(self):
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self.assertThat(self.connection_pool.queue, matchers.HasLength(0))
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with self.connection_pool.acquire() as conn:
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self.assertEqual(1, self.connection_pool._acquired)
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self.assertEqual(0, self.connection_pool._acquired)
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self.assertThat(self.connection_pool.queue, matchers.HasLength(1))
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self.assertEqual(conn, self.connection_pool.queue[0].connection)
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def test_cleanup_pool(self):
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self.test_get_context_manager()
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newtime = time.time() + self.unused_timeout * 2
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non_expired_connection = _memcache_pool._PoolItem(
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ttl=(newtime * 2),
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connection=mock.MagicMock())
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self.connection_pool.queue.append(non_expired_connection)
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self.assertThat(self.connection_pool.queue, matchers.HasLength(2))
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with mock.patch.object(time, 'time', return_value=newtime):
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conn = self.connection_pool.queue[0].connection
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with self.connection_pool.acquire():
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pass
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conn.assert_has_calls(
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[mock.call(self.connection_pool.destroyed_value)])
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self.assertThat(self.connection_pool.queue, matchers.HasLength(1))
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self.assertEqual(0, non_expired_connection.connection.call_count)
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def test_acquire_conn_exception_returns_acquired_count(self):
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class TestException(Exception):
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pass
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with mock.patch.object(_TestConnectionPool, '_create_connection',
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side_effect=TestException):
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with testtools.ExpectedException(TestException):
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with self.connection_pool.acquire():
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pass
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self.assertThat(self.connection_pool.queue,
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matchers.HasLength(0))
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self.assertEqual(0, self.connection_pool._acquired)
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def test_connection_pool_limits_maximum_connections(self):
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# NOTE(morganfainberg): To ensure we don't lockup tests until the
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# job limit, explicitly call .get_nowait() and .put_nowait() in this
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# case.
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conn1 = self.connection_pool.get_nowait()
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conn2 = self.connection_pool.get_nowait()
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# Use a nowait version to raise an Empty exception indicating we would
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# not get another connection until one is placed back into the queue.
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self.assertRaises(queue.Empty, self.connection_pool.get_nowait)
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# Place the connections back into the pool.
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self.connection_pool.put_nowait(conn1)
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self.connection_pool.put_nowait(conn2)
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# Make sure we can get a connection out of the pool again.
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self.connection_pool.get_nowait()
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def test_connection_pool_maximum_connection_get_timeout(self):
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connection_pool = _TestConnectionPool(
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maxsize=1,
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unused_timeout=self.unused_timeout,
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conn_get_timeout=0)
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def _acquire_connection():
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with connection_pool.acquire():
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pass
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# Make sure we've consumed the only available connection from the pool
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conn = connection_pool.get_nowait()
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self.assertRaises(_memcache_pool.exception.QueueEmpty,
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_acquire_connection)
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# Put the connection back and ensure we can acquire the connection
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# after it is available.
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connection_pool.put_nowait(conn)
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_acquire_connection()
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