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# Copyright 2014 Mirantis.inc
# All Rights Reserved.
#
# 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 sys
from unittest import mock
from oslo_config import fixture as config_fixture
from oslo_db import concurrency
from oslo_db.tests import base as test_base
FAKE_BACKEND_MAPPING = {'sqlalchemy': 'fake.db.sqlalchemy.api'}
class TpoolDbapiWrapperTestCase(test_base.BaseTestCase):
def setUp(self):
super(TpoolDbapiWrapperTestCase, self).setUp()
self.conf = self.useFixture(config_fixture.Config()).conf
self.db_api = concurrency.TpoolDbapiWrapper(
conf=self.conf, backend_mapping=FAKE_BACKEND_MAPPING)
# NOTE(akurilin): We are not going to add `eventlet` to `oslo_db` in
# requirements (`requirements.txt` and `test-requirements.txt`) due to
# the following reasons:
# - supporting of eventlet's thread pooling is totally optional;
# - we don't need to test `tpool.Proxy` functionality itself,
# because it's a tool from the third party library;
# - `eventlet` would prevent us from running unit tests on Python 3.x
# versions, because it doesn't support them yet.
#
# As we don't test `tpool.Proxy`, we can safely mock it in tests.
self.proxy = mock.MagicMock()
self.eventlet = mock.MagicMock()
self.eventlet.tpool.Proxy.return_value = self.proxy
sys.modules['eventlet'] = self.eventlet
self.addCleanup(sys.modules.pop, 'eventlet', None)
@mock.patch('oslo_db.api.DBAPI')
def test_db_api_common(self, mock_db_api):
# test context:
# CONF.database.use_tpool == False
# eventlet is installed
# expected result:
# TpoolDbapiWrapper should wrap DBAPI
fake_db_api = mock.MagicMock()
mock_db_api.from_config.return_value = fake_db_api
# get access to some db-api method
self.db_api.fake_call_1
mock_db_api.from_config.assert_called_once_with(
conf=self.conf, backend_mapping=FAKE_BACKEND_MAPPING)
self.assertEqual(fake_db_api, self.db_api._db_api)
self.assertFalse(self.eventlet.tpool.Proxy.called)
# get access to other db-api method to be sure that api didn't changed
self.db_api.fake_call_2
self.assertEqual(fake_db_api, self.db_api._db_api)
self.assertFalse(self.eventlet.tpool.Proxy.called)
self.assertEqual(1, mock_db_api.from_config.call_count)
@mock.patch('oslo_db.api.DBAPI')
def test_db_api_config_change(self, mock_db_api):
# test context:
# CONF.database.use_tpool == True
# eventlet is installed
# expected result:
# TpoolDbapiWrapper should wrap tpool proxy
fake_db_api = mock.MagicMock()
mock_db_api.from_config.return_value = fake_db_api
self.conf.set_override('use_tpool', True, group='database')
# get access to some db-api method
self.db_api.fake_call
# CONF.database.use_tpool is True, so we get tpool proxy in this case
mock_db_api.from_config.assert_called_once_with(
conf=self.conf, backend_mapping=FAKE_BACKEND_MAPPING)
self.eventlet.tpool.Proxy.assert_called_once_with(fake_db_api)
self.assertEqual(self.proxy, self.db_api._db_api)
@mock.patch('oslo_db.api.DBAPI')
def test_db_api_without_installed_eventlet(self, mock_db_api):
# test context:
# CONF.database.use_tpool == True
# eventlet is not installed
# expected result:
# raise ImportError
self.conf.set_override('use_tpool', True, group='database')
sys.modules['eventlet'] = None
self.assertRaises(ImportError, getattr, self.db_api, 'fake')
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