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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.
from unittest import mock
from nova import context as nova_context
from nova import exception
from nova.objects import service
from nova import test
from nova.tests import fixtures as nova_fixtures
from nova.tests.functional import fixtures as func_fixtures
from nova.tests.functional import integrated_helpers
class ServiceTestCase(test.TestCase,
integrated_helpers.InstanceHelperMixin):
"""Contains scenarios for testing services.
"""
def setUp(self):
super(ServiceTestCase, self).setUp()
# Use the standard fixtures.
self.useFixture(nova_fixtures.RealPolicyFixture())
self.useFixture(nova_fixtures.NeutronFixture(self))
self.useFixture(nova_fixtures.GlanceFixture(self))
self.useFixture(func_fixtures.PlacementFixture())
# Start nova controller services.
self.api = self.useFixture(nova_fixtures.OSAPIFixture(
api_version='v2.1')).api
self.start_service('conductor')
self.scheduler = self.start_service('scheduler')
# Our OSAPIFixture does not use a WSGIService, so just use the metadata
# server fixture (which uses WSGIService) for testing.
self.metadata = self.useFixture(
nova_fixtures.OSMetadataServer()).metadata
# Start one compute service.
self.start_service('compute')
def test_service_reset_resets_cell_cache(self):
"""Tests that the cell cache for database transaction context managers
is cleared after a service reset (example scenario: SIGHUP).
"""
server_req = self._build_server()
server = self.api.post_server({'server': server_req})
self._wait_for_state_change(server, 'ACTIVE')
# Cell cache should be populated after creating a server.
self.assertTrue(nova_context.CELL_CACHE)
self.scheduler.reset()
# Cell cache should be empty after the service reset.
self.assertEqual({}, nova_context.CELL_CACHE)
# Now test the WSGI service.
server = self.api.post_server({'server': server_req})
self._wait_for_state_change(server, 'ACTIVE')
# Cell cache should be populated after creating a server.
self.assertTrue(nova_context.CELL_CACHE)
self.metadata.reset()
# Cell cache should be empty after the service reset.
self.assertEqual({}, nova_context.CELL_CACHE)
def test_service_start_resets_cell_cache(self):
"""Tests that the cell cache for database transaction context managers
is cleared upon a service start (example scenario: service start after
a SIGTERM and the parent process forks child process workers).
"""
server_req = self._build_server()
server = self.api.post_server({'server': server_req})
self._wait_for_state_change(server, 'ACTIVE')
# Cell cache should be populated after creating a server.
self.assertTrue(nova_context.CELL_CACHE)
self.scheduler.stop()
# NOTE(melwitt): Simulate a service starting after being stopped. The
# scenario we want to handle is one where during start, the parent
# process forks child process workers while one or more of its cached
# database transaction context managers is inside a locked code
# section. If the child processes are forked while the lock is locked,
# the child processes begin with an already locked lock that can never
# be acquired again. The result is that requests gets stuck and fail
# with a CellTimeout error.
self.scheduler.start()
# Cell cache should be empty after the service start.
self.assertEqual({}, nova_context.CELL_CACHE)
# Now test the WSGI service.
server = self.api.post_server({'server': server_req})
self._wait_for_state_change(server, 'ACTIVE')
# Cell cache should be populated after creating a server.
self.assertTrue(nova_context.CELL_CACHE)
# we need to mock nova.utils.raise_if_old_compute() that is run at
# service startup as that will check the global service level which
# populates the cell cache
with mock.patch("nova.utils.raise_if_old_compute"):
self.metadata.stop()
self.metadata.start()
# Cell cache should be empty after the service reset.
self.assertEqual({}, nova_context.CELL_CACHE)
class TestOldComputeCheck(
test.TestCase, integrated_helpers.InstanceHelperMixin):
def test_conductor_fails_to_start_with_old_compute(self):
old_version = service.SERVICE_VERSION_ALIASES[
service.OLDEST_SUPPORTED_SERVICE_VERSION] - 1
with mock.patch(
"nova.objects.service.get_minimum_version_all_cells",
return_value=old_version):
self.assertRaises(
exception.TooOldComputeService, self.start_service,
'conductor')
def test_api_fails_to_start_with_old_compute(self):
old_version = service.SERVICE_VERSION_ALIASES[
service.OLDEST_SUPPORTED_SERVICE_VERSION] - 1
with mock.patch(
"nova.objects.service.get_minimum_version_all_cells",
return_value=old_version):
self.assertRaises(
exception.TooOldComputeService, self.useFixture,
nova_fixtures.OSAPIFixture(api_version='v2.1'))
def test_compute_fails_to_start_with_old_compute(self):
old_version = service.SERVICE_VERSION_ALIASES[
service.OLDEST_SUPPORTED_SERVICE_VERSION] - 1
with mock.patch(
"nova.objects.service.get_minimum_version_all_cells",
return_value=old_version):
self.assertRaises(
exception.TooOldComputeService, self._start_compute, 'host1')
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