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# 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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from nova import context as nova_context |
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from nova import test |
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from nova.tests import fixtures as nova_fixtures |
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from nova.tests.functional import integrated_helpers |
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from nova.tests.unit import fake_network |
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from nova.tests.unit.image import fake as fake_image |
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from nova.tests.unit import policy_fixture |
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class ServiceTestCase(test.TestCase, |
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integrated_helpers.InstanceHelperMixin): |
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"""Contains scenarios for testing services. |
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""" |
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def setUp(self): |
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super(ServiceTestCase, self).setUp() |
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# Use the standard fixtures. |
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self.useFixture(policy_fixture.RealPolicyFixture()) |
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self.useFixture(nova_fixtures.NeutronFixture(self)) |
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self.useFixture(nova_fixtures.PlacementFixture()) |
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fake_image.stub_out_image_service(self) |
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self.addCleanup(fake_image.FakeImageService_reset) |
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fake_network.set_stub_network_methods(self) |
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# Start nova controller services. |
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self.api = self.useFixture(nova_fixtures.OSAPIFixture( |
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api_version='v2.1')).api |
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self.start_service('conductor') |
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self.scheduler = self.start_service('scheduler') |
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# Our OSAPIFixture does not use a WSGIService, so just use the metadata |
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# server fixture (which uses WSGIService) for testing. |
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self.metadata = self.useFixture( |
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nova_fixtures.OSMetadataServer()).metadata |
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# Start one compute service. |
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self.start_service('compute') |
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def test_service_reset_resets_cell_cache(self): |
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"""Tests that the cell cache for database transaction context managers |
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is cleared after a service reset (example scenario: SIGHUP). |
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""" |
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server_req = self._build_minimal_create_server_request( |
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self.api, 'test-service-reset') |
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server = self.api.post_server({'server': server_req}) |
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self._wait_for_state_change(self.api, server, 'ACTIVE') |
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# Cell cache should be populated after creating a server. |
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self.assertTrue(nova_context.CELL_CACHE) |
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self.scheduler.reset() |
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# Cell cache should be empty after the service reset. |
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self.assertEqual({}, nova_context.CELL_CACHE) |
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# Now test the WSGI service. |
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server = self.api.post_server({'server': server_req}) |
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self._wait_for_state_change(self.api, server, 'ACTIVE') |
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# Cell cache should be populated after creating a server. |
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self.assertTrue(nova_context.CELL_CACHE) |
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self.metadata.reset() |
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# Cell cache should be empty after the service reset. |
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self.assertEqual({}, nova_context.CELL_CACHE) |
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def test_service_start_resets_cell_cache(self): |
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"""Tests that the cell cache for database transaction context managers |
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is cleared upon a service start (example scenario: service start after |
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a SIGTERM and the parent process forks child process workers). |
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""" |
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server_req = self._build_minimal_create_server_request( |
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self.api, 'test-service-start') |
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server = self.api.post_server({'server': server_req}) |
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self._wait_for_state_change(self.api, server, 'ACTIVE') |
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# Cell cache should be populated after creating a server. |
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self.assertTrue(nova_context.CELL_CACHE) |
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self.scheduler.stop() |
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# NOTE(melwitt): Simulate a service starting after being stopped. The |
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# scenario we want to handle is one where during start, the parent |
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# process forks child process workers while one or more of its cached |
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# database transaction context managers is inside a locked code |
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# section. If the child processes are forked while the lock is locked, |
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# the child processes begin with an already locked lock that can never |
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# be acquired again. The result is that requests gets stuck and fail |
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# with a CellTimeout error. |
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self.scheduler.start() |
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# Cell cache should be empty after the service start. |
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self.assertEqual({}, nova_context.CELL_CACHE) |
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# Now test the WSGI service. |
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server = self.api.post_server({'server': server_req}) |
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self._wait_for_state_change(self.api, server, 'ACTIVE') |
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# Cell cache should be populated after creating a server. |
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self.assertTrue(nova_context.CELL_CACHE) |
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self.metadata.stop() |
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self.metadata.start() |
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# Cell cache should be empty after the service reset. |
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self.assertEqual({}, nova_context.CELL_CACHE) |