86 lines
3.4 KiB
Python
86 lines
3.4 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 mock
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from nova.db.sqlalchemy import resource_class_cache as rc_cache
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from nova import exception
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from nova import test
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from nova.tests import fixtures
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class TestResourceClassCache(test.TestCase):
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def setUp(self):
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super(TestResourceClassCache, self).setUp()
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self.db = self.useFixture(fixtures.Database(database='api'))
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self.context = mock.Mock()
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sess_mock = mock.Mock()
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sess_mock.connection.side_effect = self.db.get_engine().connect
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self.context.session = sess_mock
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@mock.patch('sqlalchemy.select')
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def test_rc_cache_std_no_db(self, sel_mock):
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"""Test that looking up either an ID or a string in the resource class
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cache for a standardized resource class does not result in a DB
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call.
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"""
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cache = rc_cache.ResourceClassCache(self.context)
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self.assertEqual('VCPU', cache.string_from_id(0))
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self.assertEqual('MEMORY_MB', cache.string_from_id(1))
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self.assertEqual(0, cache.id_from_string('VCPU'))
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self.assertEqual(1, cache.id_from_string('MEMORY_MB'))
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self.assertFalse(sel_mock.called)
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def test_rc_cache_custom(self):
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"""Test that non-standard, custom resource classes hit the database and
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return appropriate results, caching the results after a single
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query.
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"""
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cache = rc_cache.ResourceClassCache(self.context)
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# Haven't added anything to the DB yet, so should raise
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# ResourceClassNotFound
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self.assertRaises(exception.ResourceClassNotFound,
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cache.string_from_id, 1001)
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self.assertRaises(exception.ResourceClassNotFound,
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cache.id_from_string, "IRON_NFV")
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# Now add to the database and verify appropriate results...
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with self.context.session.connection() as conn:
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ins_stmt = rc_cache._RC_TBL.insert().values(
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id=1001,
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name='IRON_NFV'
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)
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conn.execute(ins_stmt)
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self.assertEqual('IRON_NFV', cache.string_from_id(1001))
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self.assertEqual(1001, cache.id_from_string('IRON_NFV'))
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# Try same again and verify we don't hit the DB.
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with mock.patch('sqlalchemy.select') as sel_mock:
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self.assertEqual('IRON_NFV', cache.string_from_id(1001))
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self.assertEqual(1001, cache.id_from_string('IRON_NFV'))
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self.assertFalse(sel_mock.called)
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def test_rc_cache_miss(self):
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"""Test that we raise ResourceClassNotFound if an unknown resource
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class ID or string is searched for.
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"""
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cache = rc_cache.ResourceClassCache(self.context)
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self.assertRaises(exception.ResourceClassNotFound,
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cache.string_from_id, 99999999)
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self.assertRaises(exception.ResourceClassNotFound,
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cache.id_from_string, 'UNKNOWN')
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