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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 mock
from oslo import messaging
from heat.common import exception
from heat.db import api as db_api
from heat.engine import stack_lock
from heat.tests.common import HeatTestCase
from heat.tests import utils
class StackLockTest(HeatTestCase):
def setUp(self):
super(StackLockTest, self).setUp()
self.context = utils.dummy_context()
self.stack = self.m.CreateMockAnything()
self.stack.id = "aae01f2d-52ae-47ac-8a0d-3fde3d220fea"
self.stack.name = "test_stack"
self.stack.action = "CREATE"
self.engine_id = stack_lock.StackLock.generate_engine_id()
class TestThreadLockException(Exception):
pass
def test_successful_acquire_new_lock(self):
self.m.StubOutWithMock(db_api, "stack_lock_create")
db_api.stack_lock_create(
self.stack.id, self.engine_id).AndReturn(None)
self.m.ReplayAll()
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
slock.acquire()
self.m.VerifyAll()
def test_failed_acquire_existing_lock_current_engine(self):
self.m.StubOutWithMock(db_api, "stack_lock_create")
db_api.stack_lock_create(
self.stack.id, self.engine_id).AndReturn(self.engine_id)
self.m.ReplayAll()
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
self.assertRaises(exception.ActionInProgress, slock.acquire)
self.m.VerifyAll()
def test_successful_acquire_existing_lock_engine_dead(self):
self.m.StubOutWithMock(db_api, "stack_lock_create")
db_api.stack_lock_create(
self.stack.id, self.engine_id).AndReturn("fake-engine-id")
self.m.StubOutWithMock(db_api, "stack_lock_steal")
db_api.stack_lock_steal(self.stack.id, "fake-engine-id",
self.engine_id).AndReturn(None)
self.m.ReplayAll()
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
self.patchobject(slock, 'engine_alive', return_value=False)
slock.acquire()
self.m.VerifyAll()
def test_failed_acquire_existing_lock_engine_alive(self):
self.m.StubOutWithMock(db_api, "stack_lock_create")
db_api.stack_lock_create(
self.stack.id, self.engine_id).AndReturn("fake-engine-id")
self.m.ReplayAll()
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
self.patchobject(slock, 'engine_alive', return_value=True)
self.assertRaises(exception.ActionInProgress, slock.acquire)
self.m.VerifyAll()
def test_failed_acquire_existing_lock_engine_dead(self):
self.m.StubOutWithMock(db_api, "stack_lock_create")
db_api.stack_lock_create(
self.stack.id, self.engine_id).AndReturn("fake-engine-id")
self.m.StubOutWithMock(db_api, "stack_lock_steal")
db_api.stack_lock_steal(
self.stack.id, "fake-engine-id",
self.engine_id).AndReturn("fake-engine-id2")
self.m.ReplayAll()
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
self.patchobject(slock, 'engine_alive', return_value=False)
self.assertRaises(exception.ActionInProgress, slock.acquire)
self.m.VerifyAll()
def test_successful_acquire_with_retry(self):
self.m.StubOutWithMock(db_api, "stack_lock_create")
db_api.stack_lock_create(
self.stack.id, self.engine_id).AndReturn("fake-engine-id")
self.m.StubOutWithMock(db_api, "stack_lock_steal")
db_api.stack_lock_steal(
self.stack.id, "fake-engine-id", self.engine_id).AndReturn(True)
db_api.stack_lock_create(
self.stack.id, self.engine_id).AndReturn("fake-engine-id")
db_api.stack_lock_steal(
self.stack.id, "fake-engine-id", self.engine_id).AndReturn(None)
self.m.ReplayAll()
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
self.patchobject(slock, 'engine_alive', return_value=False)
slock.acquire()
self.m.VerifyAll()
def test_failed_acquire_one_retry_only(self):
self.m.StubOutWithMock(db_api, "stack_lock_create")
db_api.stack_lock_create(
self.stack.id, self.engine_id).AndReturn("fake-engine-id")
self.m.StubOutWithMock(db_api, "stack_lock_steal")
db_api.stack_lock_steal(
self.stack.id, "fake-engine-id", self.engine_id).AndReturn(True)
db_api.stack_lock_create(
self.stack.id, self.engine_id).AndReturn("fake-engine-id")
db_api.stack_lock_steal(
self.stack.id, "fake-engine-id", self.engine_id).AndReturn(True)
self.m.ReplayAll()
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
self.patchobject(slock, 'engine_alive', return_value=False)
self.assertRaises(exception.ActionInProgress, slock.acquire)
self.m.VerifyAll()
def test_thread_lock_context_mgr_exception(self):
db_api.stack_lock_create = mock.Mock(return_value=None)
db_api.stack_lock_release = mock.Mock(return_value=None)
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
def check_thread_lock():
with slock.thread_lock(self.stack.id):
self.assertEqual(1, db_api.stack_lock_create.call_count)
raise self.TestThreadLockException
self.assertRaises(self.TestThreadLockException, check_thread_lock)
self.assertEqual(1, db_api.stack_lock_release.call_count)
def test_thread_lock_context_mgr_no_exception(self):
db_api.stack_lock_create = mock.Mock(return_value=None)
db_api.stack_lock_release = mock.Mock(return_value=None)
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
with slock.thread_lock(self.stack.id):
self.assertEqual(1, db_api.stack_lock_create.call_count)
assert not db_api.stack_lock_release.called
def test_try_thread_lock_context_mgr_exception(self):
db_api.stack_lock_create = mock.Mock(return_value=None)
db_api.stack_lock_release = mock.Mock(return_value=None)
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
def check_thread_lock():
with slock.try_thread_lock(self.stack.id):
self.assertEqual(1, db_api.stack_lock_create.call_count)
raise self.TestThreadLockException
self.assertRaises(self.TestThreadLockException, check_thread_lock)
self.assertEqual(1, db_api.stack_lock_release.call_count)
def test_try_thread_lock_context_mgr_no_exception(self):
db_api.stack_lock_create = mock.Mock(return_value=None)
db_api.stack_lock_release = mock.Mock(return_value=None)
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
with slock.try_thread_lock(self.stack.id):
self.assertEqual(1, db_api.stack_lock_create.call_count)
assert not db_api.stack_lock_release.called
def test_try_thread_lock_context_mgr_existing_lock(self):
db_api.stack_lock_create = mock.Mock(return_value=1234)
db_api.stack_lock_release = mock.Mock(return_value=None)
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
def check_thread_lock():
with slock.try_thread_lock(self.stack.id):
self.assertEqual(1, db_api.stack_lock_create.call_count)
raise self.TestThreadLockException
self.assertRaises(self.TestThreadLockException, check_thread_lock)
assert not db_api.stack_lock_release.called
def test_engine_alive_ok(self):
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
mget_client = self.patchobject(stack_lock.rpc_messaging,
'get_rpc_client')
mclient = mget_client.return_value
mclient_ctx = mclient.prepare.return_value
mclient_ctx.call.return_value = True
ret = slock.engine_alive(self.context, self.engine_id)
self.assertTrue(ret)
mclient.prepare.assert_called_once_with(timeout=2)
mclient_ctx.call.assert_called_once_with(self.context, 'listening')
def test_engine_alive_timeout(self):
slock = stack_lock.StackLock(self.context, self.stack, self.engine_id)
mget_client = self.patchobject(stack_lock.rpc_messaging,
'get_rpc_client')
mclient = mget_client.return_value
mclient_ctx = mclient.prepare.return_value
mclient_ctx.call.side_effect = messaging.MessagingTimeout('too slow')
ret = slock.engine_alive(self.context, self.engine_id)
self.assertIs(False, ret)
mclient.prepare.assert_called_once_with(timeout=2)
mclient_ctx.call.assert_called_once_with(self.context, 'listening')
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