OpenStack Identity (Keystone) Middleware
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keystonemiddleware/keystonemiddleware/tests/test_connection_pool.py

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# 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 time
import mock
from six.moves import queue
import testtools
from testtools import matchers
from keystonemiddleware import _memcache_pool
from keystonemiddleware.tests import utils
class _TestConnectionPool(_memcache_pool.ConnectionPool):
destroyed_value = 'destroyed'
def _create_connection(self):
return mock.MagicMock()
def _destroy_connection(self, conn):
conn(self.destroyed_value)
class TestConnectionPool(utils.TestCase):
def setUp(self):
super(TestConnectionPool, self).setUp()
self.unused_timeout = 10
self.maxsize = 2
self.connection_pool = _TestConnectionPool(
maxsize=self.maxsize,
unused_timeout=self.unused_timeout)
def test_get_context_manager(self):
self.assertThat(self.connection_pool.queue, matchers.HasLength(0))
with self.connection_pool.acquire() as conn:
self.assertEqual(1, self.connection_pool._acquired)
self.assertEqual(0, self.connection_pool._acquired)
self.assertThat(self.connection_pool.queue, matchers.HasLength(1))
self.assertEqual(conn, self.connection_pool.queue[0].connection)
def test_cleanup_pool(self):
self.test_get_context_manager()
newtime = time.time() + self.unused_timeout * 2
non_expired_connection = _memcache_pool._PoolItem(
ttl=(newtime * 2),
connection=mock.MagicMock())
self.connection_pool.queue.append(non_expired_connection)
self.assertThat(self.connection_pool.queue, matchers.HasLength(2))
with mock.patch.object(time, 'time', return_value=newtime):
conn = self.connection_pool.queue[0].connection
with self.connection_pool.acquire():
pass
conn.assert_has_calls(
[mock.call(self.connection_pool.destroyed_value)])
self.assertThat(self.connection_pool.queue, matchers.HasLength(1))
self.assertEqual(0, non_expired_connection.connection.call_count)
def test_acquire_conn_exception_returns_acquired_count(self):
class TestException(Exception):
pass
with mock.patch.object(_TestConnectionPool, '_create_connection',
side_effect=TestException):
with testtools.ExpectedException(TestException):
with self.connection_pool.acquire():
pass
self.assertThat(self.connection_pool.queue,
matchers.HasLength(0))
self.assertEqual(0, self.connection_pool._acquired)
def test_connection_pool_limits_maximum_connections(self):
# NOTE(morganfainberg): To ensure we don't lockup tests until the
# job limit, explicitly call .get_nowait() and .put_nowait() in this
# case.
conn1 = self.connection_pool.get_nowait()
conn2 = self.connection_pool.get_nowait()
# Use a nowait version to raise an Empty exception indicating we would
# not get another connection until one is placed back into the queue.
self.assertRaises(queue.Empty, self.connection_pool.get_nowait)
# Place the connections back into the pool.
self.connection_pool.put_nowait(conn1)
self.connection_pool.put_nowait(conn2)
# Make sure we can get a connection out of the pool again.
self.connection_pool.get_nowait()
def test_connection_pool_maximum_connection_get_timeout(self):
connection_pool = _TestConnectionPool(
maxsize=1,
unused_timeout=self.unused_timeout,
conn_get_timeout=0)
def _acquire_connection():
with connection_pool.acquire():
pass
# Make sure we've consumed the only available connection from the pool
conn = connection_pool.get_nowait()
self.assertRaises(_memcache_pool.ConnectionGetTimeoutException,
_acquire_connection)
# Put the connection back and ensure we can acquire the connection
# after it is available.
connection_pool.put_nowait(conn)
_acquire_connection()