#    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.

"""Unit tests for ComputeManager()."""

import contextlib
import time
import uuid

from cinderclient import exceptions as cinder_exception
from eventlet import event as eventlet_event
import mock
from mox3 import mox
import netaddr
from oslo_config import cfg
import oslo_messaging as messaging
from oslo_utils import importutils
from oslo_utils import timeutils
from oslo_utils import uuidutils
import six

import nova
from nova.compute import build_results
from nova.compute import manager
from nova.compute import power_state
from nova.compute import task_states
from nova.compute import utils as compute_utils
from nova.compute import vm_states
from nova.conductor import api as conductor_api
from nova import context
from nova import db
from nova import exception
from nova.network import api as network_api
from nova.network import model as network_model
from nova import objects
from nova.objects import block_device as block_device_obj
from nova import test
from nova.tests.unit.compute import fake_resource_tracker
from nova.tests.unit import fake_block_device
from nova.tests.unit import fake_instance
from nova.tests.unit import fake_network
from nova.tests.unit import fake_network_cache_model
from nova.tests.unit import fake_server_actions
from nova.tests.unit.objects import test_instance_fault
from nova.tests.unit.objects import test_instance_info_cache
from nova import utils
from nova.virt import driver as virt_driver
from nova.virt import event as virtevent
from nova.virt import fake as fake_driver
from nova.virt import hardware


CONF = cfg.CONF
CONF.import_opt('compute_manager', 'nova.service')


class ComputeManagerUnitTestCase(test.NoDBTestCase):
    def setUp(self):
        super(ComputeManagerUnitTestCase, self).setUp()
        self.flags(use_local=True, group='conductor')
        self.compute = importutils.import_object(CONF.compute_manager)
        self.context = context.RequestContext('fake', 'fake')
        fake_server_actions.stub_out_action_events(self.stubs)

    @mock.patch.object(manager.ComputeManager, '_get_power_state')
    @mock.patch.object(manager.ComputeManager, '_sync_instance_power_state')
    @mock.patch.object(objects.Instance, 'get_by_uuid')
    def _test_handle_lifecycle_event(self, mock_get, mock_sync,
                                     mock_get_power_state, transition,
                                     event_pwr_state, current_pwr_state):
        event = mock.Mock()
        event.get_instance_uuid.return_value = mock.sentinel.uuid
        event.get_transition.return_value = transition
        mock_get_power_state.return_value = current_pwr_state

        self.compute.handle_lifecycle_event(event)

        mock_get.assert_called_with(mock.ANY, mock.sentinel.uuid,
                                    expected_attrs=[])
        if event_pwr_state == current_pwr_state:
            mock_sync.assert_called_with(mock.ANY, mock_get.return_value,
                                         event_pwr_state)
        else:
            self.assertFalse(mock_sync.called)

    def test_handle_lifecycle_event(self):
        event_map = {virtevent.EVENT_LIFECYCLE_STOPPED: power_state.SHUTDOWN,
                     virtevent.EVENT_LIFECYCLE_STARTED: power_state.RUNNING,
                     virtevent.EVENT_LIFECYCLE_PAUSED: power_state.PAUSED,
                     virtevent.EVENT_LIFECYCLE_RESUMED: power_state.RUNNING,
                     virtevent.EVENT_LIFECYCLE_SUSPENDED:
                         power_state.SUSPENDED,
        }

        for transition, pwr_state in six.iteritems(event_map):
            self._test_handle_lifecycle_event(transition=transition,
                                              event_pwr_state=pwr_state,
                                              current_pwr_state=pwr_state)

    def test_handle_lifecycle_event_state_mismatch(self):
        self._test_handle_lifecycle_event(
            transition=virtevent.EVENT_LIFECYCLE_STOPPED,
            event_pwr_state=power_state.SHUTDOWN,
            current_pwr_state=power_state.RUNNING)

    def test_delete_instance_info_cache_delete_ordering(self):
        call_tracker = mock.Mock()
        call_tracker.clear_events_for_instance.return_value = None
        mgr_class = self.compute.__class__
        orig_delete = mgr_class._delete_instance
        specd_compute = mock.create_autospec(mgr_class)
        # spec out everything except for the method we really want
        # to test, then use call_tracker to verify call sequence
        specd_compute._delete_instance = orig_delete

        mock_inst = mock.Mock()
        mock_inst.uuid = 'inst-1'
        mock_inst.save = mock.Mock()
        mock_inst.destroy = mock.Mock()
        mock_inst.system_metadata = mock.Mock()

        def _mark_notify(*args, **kwargs):
            call_tracker._notify_about_instance_usage(*args, **kwargs)

        def _mark_shutdown(*args, **kwargs):
            call_tracker._shutdown_instance(*args, **kwargs)

        specd_compute.instance_events = call_tracker
        specd_compute._notify_about_instance_usage = _mark_notify
        specd_compute._shutdown_instance = _mark_shutdown
        mock_inst.info_cache = call_tracker

        specd_compute._delete_instance(specd_compute,
                                       self.context,
                                       mock_inst,
                                       mock.Mock(),
                                       mock.Mock())

        methods_called = [n for n, a, k in call_tracker.mock_calls]
        self.assertEqual(['clear_events_for_instance',
                          '_notify_about_instance_usage',
                          '_shutdown_instance', 'delete'],
                         methods_called)

    @mock.patch.object(manager.ComputeManager, '_get_resource_tracker')
    @mock.patch.object(fake_driver.FakeDriver, 'get_available_nodes')
    @mock.patch.object(manager.ComputeManager, '_get_compute_nodes_in_db')
    def test_update_available_resource(self, get_db_nodes, get_avail_nodes,
                                       get_rt):
        info = {'cn_id': 1}

        def _make_compute_node(hyp_hostname):
            cn = mock.Mock(spec_set=['hypervisor_hostname', 'id',
                                     'destroy'])
            cn.id = info['cn_id']
            info['cn_id'] += 1
            cn.hypervisor_hostname = hyp_hostname
            return cn

        def _make_rt(node):
            n = mock.Mock(spec_set=['update_available_resource',
                                    'nodename'])
            n.nodename = node
            return n

        ctxt = mock.Mock()
        db_nodes = [_make_compute_node('node1'),
                    _make_compute_node('node2'),
                    _make_compute_node('node3'),
                    _make_compute_node('node4')]
        avail_nodes = set(['node2', 'node3', 'node4', 'node5'])
        avail_nodes_l = list(avail_nodes)
        rts = [_make_rt(node) for node in avail_nodes_l]
        # Make the 2nd and 3rd ones raise
        exc = exception.ComputeHostNotFound(host='fake')
        rts[1].update_available_resource.side_effect = exc
        exc = test.TestingException()
        rts[2].update_available_resource.side_effect = exc
        rts_iter = iter(rts)

        def _get_rt_side_effect(*args, **kwargs):
            return next(rts_iter)

        expected_rt_dict = {avail_nodes_l[0]: rts[0],
                            avail_nodes_l[2]: rts[2],
                            avail_nodes_l[3]: rts[3]}
        get_db_nodes.return_value = db_nodes
        get_avail_nodes.return_value = avail_nodes
        get_rt.side_effect = _get_rt_side_effect
        self.compute.update_available_resource(ctxt)
        get_db_nodes.assert_called_once_with(ctxt, use_slave=True)
        self.assertEqual([mock.call(node) for node in avail_nodes],
                         get_rt.call_args_list)
        for rt in rts:
            rt.update_available_resource.assert_called_once_with(ctxt)
        self.assertEqual(expected_rt_dict,
                         self.compute._resource_tracker_dict)
        # First node in set should have been removed from DB
        for db_node in db_nodes:
            if db_node.hypervisor_hostname == 'node1':
                db_node.destroy.assert_called_once_with()
            else:
                self.assertFalse(db_node.destroy.called)

    def test_delete_instance_without_info_cache(self):
        instance = fake_instance.fake_instance_obj(
                self.context,
                uuid='fake',
                vm_state=vm_states.ERROR,
                host=self.compute.host,
                expected_attrs=['system_metadata'])
        quotas = mock.create_autospec(objects.Quotas, spec_set=True)

        with contextlib.nested(
            mock.patch.object(self.compute, '_notify_about_instance_usage'),
            mock.patch.object(self.compute, '_shutdown_instance'),
            mock.patch.object(instance, 'obj_load_attr'),
            mock.patch.object(instance, 'save'),
            mock.patch.object(instance, 'destroy')
        ) as (
            compute_notify_about_instance_usage, comupte_shutdown_instance,
            instance_obj_load_attr, instance_save, instance_destroy
        ):
            instance.info_cache = None
            self.compute._delete_instance(self.context, instance, [], quotas)

    @mock.patch.object(network_api.API, 'allocate_for_instance')
    @mock.patch.object(objects.Instance, 'save')
    @mock.patch.object(time, 'sleep')
    def test_allocate_network_succeeds_after_retries(
            self, mock_sleep, mock_save, mock_allocate_for_instance):
        self.flags(network_allocate_retries=8)

        instance = fake_instance.fake_instance_obj(
                       self.context, expected_attrs=['system_metadata'])

        is_vpn = 'fake-is-vpn'
        req_networks = 'fake-req-networks'
        macs = 'fake-macs'
        sec_groups = 'fake-sec-groups'
        final_result = 'meow'
        dhcp_options = None

        mock_allocate_for_instance.side_effect = [
            test.TestingException()] * 7 + [final_result]

        expected_sleep_times = [1, 2, 4, 8, 16, 30, 30, 30]

        res = self.compute._allocate_network_async(self.context, instance,
                                                   req_networks,
                                                   macs,
                                                   sec_groups,
                                                   is_vpn,
                                                   dhcp_options)

        mock_sleep.has_calls(expected_sleep_times)
        self.assertEqual(final_result, res)
        # Ensure save is not called in while allocating networks, the instance
        # is saved after the allocation.
        self.assertFalse(mock_save.called)
        self.assertEqual('True', instance.system_metadata['network_allocated'])

    def test_allocate_network_fails(self):
        self.flags(network_allocate_retries=0)

        nwapi = self.compute.network_api
        self.mox.StubOutWithMock(nwapi, 'allocate_for_instance')

        instance = {}
        is_vpn = 'fake-is-vpn'
        req_networks = 'fake-req-networks'
        macs = 'fake-macs'
        sec_groups = 'fake-sec-groups'
        dhcp_options = None

        nwapi.allocate_for_instance(
                self.context, instance, vpn=is_vpn,
                requested_networks=req_networks, macs=macs,
                security_groups=sec_groups,
                dhcp_options=dhcp_options).AndRaise(test.TestingException())

        self.mox.ReplayAll()

        self.assertRaises(test.TestingException,
                          self.compute._allocate_network_async,
                          self.context, instance, req_networks, macs,
                          sec_groups, is_vpn, dhcp_options)

    def test_allocate_network_neg_conf_value_treated_as_zero(self):
        self.flags(network_allocate_retries=-1)

        nwapi = self.compute.network_api
        self.mox.StubOutWithMock(nwapi, 'allocate_for_instance')

        instance = {}
        is_vpn = 'fake-is-vpn'
        req_networks = 'fake-req-networks'
        macs = 'fake-macs'
        sec_groups = 'fake-sec-groups'
        dhcp_options = None

        # Only attempted once.
        nwapi.allocate_for_instance(
                self.context, instance, vpn=is_vpn,
                requested_networks=req_networks, macs=macs,
                security_groups=sec_groups,
                dhcp_options=dhcp_options).AndRaise(test.TestingException())

        self.mox.ReplayAll()

        self.assertRaises(test.TestingException,
                          self.compute._allocate_network_async,
                          self.context, instance, req_networks, macs,
                          sec_groups, is_vpn, dhcp_options)

    @mock.patch.object(network_api.API, 'allocate_for_instance')
    @mock.patch.object(manager.ComputeManager, '_instance_update')
    @mock.patch.object(time, 'sleep')
    def test_allocate_network_with_conf_value_is_one(
            self, sleep, _instance_update, allocate_for_instance):
        self.flags(network_allocate_retries=1)

        instance = fake_instance.fake_instance_obj(
            self.context, expected_attrs=['system_metadata'])
        is_vpn = 'fake-is-vpn'
        req_networks = 'fake-req-networks'
        macs = 'fake-macs'
        sec_groups = 'fake-sec-groups'
        dhcp_options = None
        final_result = 'zhangtralon'

        allocate_for_instance.side_effect = [test.TestingException(),
                                             final_result]
        res = self.compute._allocate_network_async(self.context, instance,
                                                   req_networks,
                                                   macs,
                                                   sec_groups,
                                                   is_vpn,
                                                   dhcp_options)
        self.assertEqual(final_result, res)
        self.assertEqual(1, sleep.call_count)

    @mock.patch('nova.utils.spawn_n')
    @mock.patch('nova.compute.manager.ComputeManager.'
                '_do_build_and_run_instance')
    def _test_max_concurrent_builds(self, mock_dbari, mock_spawn):
        mock_spawn.side_effect = lambda f, *a, **k: f(*a, **k)

        with mock.patch.object(self.compute,
                               '_build_semaphore') as mock_sem:
            instance = objects.Instance(uuid=str(uuid.uuid4()))
            for i in (1, 2, 3):
                self.compute.build_and_run_instance(self.context, instance,
                                                    mock.sentinel.image,
                                                    mock.sentinel.request_spec,
                                                    {})
            self.assertEqual(3, mock_sem.__enter__.call_count)

    def test_max_concurrent_builds_limited(self):
        self.flags(max_concurrent_builds=2)
        self._test_max_concurrent_builds()

    def test_max_concurrent_builds_unlimited(self):
        self.flags(max_concurrent_builds=0)
        self._test_max_concurrent_builds()

    def test_max_concurrent_builds_semaphore_limited(self):
        self.flags(max_concurrent_builds=123)
        self.assertEqual(123,
                         manager.ComputeManager()._build_semaphore.balance)

    def test_max_concurrent_builds_semaphore_unlimited(self):
        self.flags(max_concurrent_builds=0)
        compute = manager.ComputeManager()
        self.assertEqual(0, compute._build_semaphore.balance)
        self.assertIsInstance(compute._build_semaphore,
                              compute_utils.UnlimitedSemaphore)

    def test_nil_out_inst_obj_host_and_node_sets_nil(self):
        instance = fake_instance.fake_instance_obj(self.context,
                                                   uuid='foo-uuid',
                                                   host='foo-host',
                                                   node='foo-node')
        self.assertIsNotNone(instance.host)
        self.assertIsNotNone(instance.node)
        self.compute._nil_out_instance_obj_host_and_node(instance)
        self.assertIsNone(instance.host)
        self.assertIsNone(instance.node)

    def test_init_host(self):
        our_host = self.compute.host
        inst = fake_instance.fake_db_instance(
                vm_state=vm_states.ACTIVE,
                info_cache=dict(test_instance_info_cache.fake_info_cache,
                                network_info=None),
                security_groups=None)
        startup_instances = [inst, inst, inst]

        def _do_mock_calls(defer_iptables_apply):
            self.compute.driver.init_host(host=our_host)
            context.get_admin_context().AndReturn(self.context)
            db.instance_get_all_by_host(
                    self.context, our_host,
                    columns_to_join=['info_cache', 'metadata'],
                    use_slave=False
                    ).AndReturn(startup_instances)
            if defer_iptables_apply:
                self.compute.driver.filter_defer_apply_on()
            self.compute._destroy_evacuated_instances(self.context)
            self.compute._init_instance(self.context,
                                        mox.IsA(objects.Instance))
            self.compute._init_instance(self.context,
                                        mox.IsA(objects.Instance))
            self.compute._init_instance(self.context,
                                        mox.IsA(objects.Instance))
            if defer_iptables_apply:
                self.compute.driver.filter_defer_apply_off()

        self.mox.StubOutWithMock(self.compute.driver, 'init_host')
        self.mox.StubOutWithMock(self.compute.driver,
                                 'filter_defer_apply_on')
        self.mox.StubOutWithMock(self.compute.driver,
                'filter_defer_apply_off')
        self.mox.StubOutWithMock(db, 'instance_get_all_by_host')
        self.mox.StubOutWithMock(context, 'get_admin_context')
        self.mox.StubOutWithMock(self.compute,
                '_destroy_evacuated_instances')
        self.mox.StubOutWithMock(self.compute,
                '_init_instance')

        # Test with defer_iptables_apply
        self.flags(defer_iptables_apply=True)
        _do_mock_calls(True)

        self.mox.ReplayAll()
        self.compute.init_host()
        self.mox.VerifyAll()

        # Test without defer_iptables_apply
        self.mox.ResetAll()
        self.flags(defer_iptables_apply=False)
        _do_mock_calls(False)

        self.mox.ReplayAll()
        self.compute.init_host()
        # tearDown() uses context.get_admin_context(), so we have
        # to do the verification here and unstub it.
        self.mox.VerifyAll()
        self.mox.UnsetStubs()

    @mock.patch('nova.objects.InstanceList')
    @mock.patch('nova.objects.MigrationList.get_by_filters')
    def test_cleanup_host(self, mock_miglist_get, mock_instance_list):
        # just testing whether the cleanup_host method
        # when fired will invoke the underlying driver's
        # equivalent method.

        mock_miglist_get.return_value = []
        mock_instance_list.get_by_host.return_value = []

        with mock.patch.object(self.compute, 'driver') as mock_driver:
            self.compute.init_host()
            mock_driver.init_host.assert_called_once_with(host='fake-mini')

            self.compute.cleanup_host()
            # register_event_listener is called on startup (init_host) and
            # in cleanup_host
            mock_driver.register_event_listener.assert_has_calls([
                mock.call(self.compute.handle_events), mock.call(None)])
            mock_driver.cleanup_host.assert_called_once_with(host='fake-mini')

    def test_init_virt_events_disabled(self):
        self.flags(handle_virt_lifecycle_events=False, group='workarounds')
        with mock.patch.object(self.compute.driver,
                               'register_event_listener') as mock_register:
            self.compute.init_virt_events()
        self.assertFalse(mock_register.called)

    @mock.patch('nova.objects.MigrationList.get_by_filters')
    @mock.patch('nova.objects.Migration.save')
    def test_init_host_with_evacuated_instance(self, mock_save, mock_mig_get):
        our_host = self.compute.host
        not_our_host = 'not-' + our_host

        deleted_instance = fake_instance.fake_instance_obj(
                self.context, host=not_our_host, uuid='fake-uuid')
        migration = objects.Migration(instance_uuid=deleted_instance.uuid)
        mock_mig_get.return_value = [migration]

        self.mox.StubOutWithMock(self.compute.driver, 'init_host')
        self.mox.StubOutWithMock(self.compute.driver, 'destroy')
        self.mox.StubOutWithMock(db, 'instance_get_all_by_host')
        self.mox.StubOutWithMock(context, 'get_admin_context')
        self.mox.StubOutWithMock(self.compute, 'init_virt_events')
        self.mox.StubOutWithMock(self.compute, '_get_instances_on_driver')
        self.mox.StubOutWithMock(self.compute, '_init_instance')
        self.mox.StubOutWithMock(self.compute.network_api,
                                 'get_instance_nw_info')

        self.compute.driver.init_host(host=our_host)
        context.get_admin_context().AndReturn(self.context)
        db.instance_get_all_by_host(self.context, our_host,
                                    columns_to_join=['info_cache', 'metadata'],
                                    use_slave=False
                                    ).AndReturn([])
        self.compute.init_virt_events()

        # simulate failed instance
        self.compute._get_instances_on_driver(
            self.context, {'deleted': False}).AndReturn([deleted_instance])
        self.compute.network_api.get_instance_nw_info(
            self.context, deleted_instance).AndRaise(
            exception.InstanceNotFound(instance_id=deleted_instance['uuid']))
        # ensure driver.destroy is called so that driver may
        # clean up any dangling files
        self.compute.driver.destroy(self.context, deleted_instance,
            mox.IgnoreArg(), mox.IgnoreArg(), mox.IgnoreArg())

        self.mox.ReplayAll()
        self.compute.init_host()
        # tearDown() uses context.get_admin_context(), so we have
        # to do the verification here and unstub it.
        self.mox.VerifyAll()
        self.mox.UnsetStubs()

    def test_init_instance_with_binding_failed_vif_type(self):
        # this instance will plug a 'binding_failed' vif
        instance = fake_instance.fake_instance_obj(
                self.context,
                uuid='fake-uuid',
                info_cache=None,
                power_state=power_state.RUNNING,
                vm_state=vm_states.ACTIVE,
                task_state=None,
                host=self.compute.host,
                expected_attrs=['info_cache'])

        with contextlib.nested(
            mock.patch.object(context, 'get_admin_context',
                return_value=self.context),
            mock.patch.object(compute_utils, 'get_nw_info_for_instance',
                return_value=network_model.NetworkInfo()),
            mock.patch.object(self.compute.driver, 'plug_vifs',
                side_effect=exception.VirtualInterfacePlugException(
                    "Unexpected vif_type=binding_failed")),
            mock.patch.object(self.compute, '_set_instance_obj_error_state')
        ) as (get_admin_context, get_nw_info, plug_vifs, set_error_state):
            self.compute._init_instance(self.context, instance)
            set_error_state.assert_called_once_with(self.context, instance)

    def test__get_power_state_InstanceNotFound(self):
        instance = fake_instance.fake_instance_obj(
                self.context,
                power_state=power_state.RUNNING)
        with mock.patch.object(self.compute.driver,
                'get_info',
                side_effect=exception.InstanceNotFound(instance_id=1)):
            self.assertEqual(self.compute._get_power_state(self.context,
                                                           instance),
                    power_state.NOSTATE)

    def test__get_power_state_NotFound(self):
        instance = fake_instance.fake_instance_obj(
                self.context,
                power_state=power_state.RUNNING)
        with mock.patch.object(self.compute.driver,
                'get_info',
                side_effect=exception.NotFound()):
            self.assertRaises(exception.NotFound,
                              self.compute._get_power_state,
                              self.context, instance)

    def test_init_instance_failed_resume_sets_error(self):
        instance = fake_instance.fake_instance_obj(
                self.context,
                uuid='fake-uuid',
                info_cache=None,
                power_state=power_state.RUNNING,
                vm_state=vm_states.ACTIVE,
                task_state=None,
                host=self.compute.host,
                expected_attrs=['info_cache'])

        self.flags(resume_guests_state_on_host_boot=True)
        self.mox.StubOutWithMock(self.compute, '_get_power_state')
        self.mox.StubOutWithMock(self.compute.driver, 'plug_vifs')
        self.mox.StubOutWithMock(self.compute.driver,
                                 'resume_state_on_host_boot')
        self.mox.StubOutWithMock(self.compute,
                                 '_get_instance_block_device_info')
        self.mox.StubOutWithMock(self.compute,
                                 '_set_instance_obj_error_state')
        self.compute._get_power_state(mox.IgnoreArg(),
                instance).AndReturn(power_state.SHUTDOWN)
        self.compute._get_power_state(mox.IgnoreArg(),
                instance).AndReturn(power_state.SHUTDOWN)
        self.compute._get_power_state(mox.IgnoreArg(),
                instance).AndReturn(power_state.SHUTDOWN)
        self.compute.driver.plug_vifs(instance, mox.IgnoreArg())
        self.compute._get_instance_block_device_info(mox.IgnoreArg(),
                instance).AndReturn('fake-bdm')
        self.compute.driver.resume_state_on_host_boot(mox.IgnoreArg(),
                instance, mox.IgnoreArg(),
                'fake-bdm').AndRaise(test.TestingException)
        self.compute._set_instance_obj_error_state(mox.IgnoreArg(), instance)
        self.mox.ReplayAll()
        self.compute._init_instance('fake-context', instance)

    @mock.patch.object(objects.BlockDeviceMapping, 'destroy')
    @mock.patch.object(objects.BlockDeviceMappingList, 'get_by_instance_uuid')
    @mock.patch.object(objects.Instance, 'destroy')
    @mock.patch.object(objects.Instance, 'obj_load_attr')
    @mock.patch.object(objects.quotas.Quotas, 'commit')
    @mock.patch.object(objects.quotas.Quotas, 'reserve')
    @mock.patch.object(objects.quotas, 'ids_from_instance')
    def test_init_instance_complete_partial_deletion(
            self, mock_ids_from_instance, mock_reserve, mock_commit,
            mock_inst_destroy, mock_obj_load_attr, mock_get_by_instance_uuid,
            mock_bdm_destroy):
        """Test to complete deletion for instances in DELETED status but not
        marked as deleted in the DB
        """
        instance = fake_instance.fake_instance_obj(
                self.context,
                project_id='fake',
                uuid='fake-uuid',
                vcpus=1,
                memory_mb=64,
                power_state=power_state.SHUTDOWN,
                vm_state=vm_states.DELETED,
                host=self.compute.host,
                task_state=None,
                deleted=False,
                deleted_at=None,
                metadata={},
                system_metadata={},
                expected_attrs=['metadata', 'system_metadata'])

        # Make sure instance vm_state is marked as 'DELETED' but instance is
        # not destroyed from db.
        self.assertEqual(vm_states.DELETED, instance.vm_state)
        self.assertFalse(instance.deleted)

        deltas = {'instances': -1,
                  'cores': -instance.vcpus,
                  'ram': -instance.memory_mb}

        def fake_inst_destroy():
            instance.deleted = True
            instance.deleted_at = timeutils.utcnow()

        mock_ids_from_instance.return_value = (instance.project_id,
                                               instance.user_id)
        mock_inst_destroy.side_effect = fake_inst_destroy()

        self.compute._init_instance(self.context, instance)

        # Make sure that instance.destroy method was called and
        # instance was deleted from db.
        self.assertTrue(mock_reserve.called)
        self.assertTrue(mock_commit.called)
        self.assertNotEqual(0, instance.deleted)
        mock_reserve.assert_called_once_with(project_id=instance.project_id,
                                             user_id=instance.user_id,
                                             **deltas)

    @mock.patch('nova.compute.manager.LOG')
    def test_init_instance_complete_partial_deletion_raises_exception(
            self, mock_log):
        instance = fake_instance.fake_instance_obj(
                self.context,
                project_id='fake',
                uuid='fake-uuid',
                vcpus=1,
                memory_mb=64,
                power_state=power_state.SHUTDOWN,
                vm_state=vm_states.DELETED,
                host=self.compute.host,
                task_state=None,
                deleted=False,
                deleted_at=None,
                metadata={},
                system_metadata={},
                expected_attrs=['metadata', 'system_metadata'])

        with mock.patch.object(self.compute,
                               '_complete_partial_deletion') as mock_deletion:
            mock_deletion.side_effect = test.TestingException()
            self.compute._init_instance(self, instance)
            msg = u'Failed to complete a deletion'
            mock_log.exception.assert_called_once_with(msg, instance=instance)

    def test_init_instance_stuck_in_deleting(self):
        instance = fake_instance.fake_instance_obj(
                self.context,
                project_id='fake',
                uuid='fake-uuid',
                vcpus=1,
                memory_mb=64,
                power_state=power_state.RUNNING,
                vm_state=vm_states.ACTIVE,
                host=self.compute.host,
                task_state=task_states.DELETING)

        self.mox.StubOutWithMock(objects.BlockDeviceMappingList,
                                 'get_by_instance_uuid')
        self.mox.StubOutWithMock(self.compute, '_delete_instance')
        self.mox.StubOutWithMock(instance, 'obj_load_attr')
        self.mox.StubOutWithMock(self.compute, '_create_reservations')

        bdms = []
        quotas = objects.quotas.Quotas(self.context)
        instance.obj_load_attr('metadata')
        instance.obj_load_attr('system_metadata')
        objects.BlockDeviceMappingList.get_by_instance_uuid(
                self.context, instance.uuid).AndReturn(bdms)
        self.compute._create_reservations(self.context, instance,
                                          instance.project_id,
                                          instance.user_id).AndReturn(quotas)
        self.compute._delete_instance(self.context, instance, bdms,
                                      mox.IgnoreArg())

        self.mox.ReplayAll()
        self.compute._init_instance(self.context, instance)

    @mock.patch.object(objects.Instance, 'get_by_uuid')
    @mock.patch.object(objects.BlockDeviceMappingList, 'get_by_instance_uuid')
    def test_init_instance_stuck_in_deleting_raises_exception(
            self, mock_get_by_instance_uuid, mock_get_by_uuid):

        instance = fake_instance.fake_instance_obj(
            self.context,
            project_id='fake',
            uuid='fake-uuid',
            vcpus=1,
            memory_mb=64,
            metadata={},
            system_metadata={},
            host=self.compute.host,
            vm_state=vm_states.ACTIVE,
            task_state=task_states.DELETING,
            expected_attrs=['metadata', 'system_metadata'])

        bdms = []
        reservations = ['fake-resv']

        def _create_patch(name, attr):
            patcher = mock.patch.object(name, attr)
            mocked_obj = patcher.start()
            self.addCleanup(patcher.stop)
            return mocked_obj

        mock_delete_instance = _create_patch(self.compute, '_delete_instance')
        mock_set_instance_error_state = _create_patch(
            self.compute, '_set_instance_obj_error_state')
        mock_create_reservations = _create_patch(self.compute,
                                                 '_create_reservations')

        mock_create_reservations.return_value = reservations
        mock_get_by_instance_uuid.return_value = bdms
        mock_get_by_uuid.return_value = instance
        mock_delete_instance.side_effect = test.TestingException('test')
        self.compute._init_instance(self.context, instance)
        mock_set_instance_error_state.assert_called_once_with(
            self.context, instance)

    def _test_init_instance_reverts_crashed_migrations(self,
                                                       old_vm_state=None):
        power_on = True if (not old_vm_state or
                            old_vm_state == vm_states.ACTIVE) else False
        sys_meta = {
            'old_vm_state': old_vm_state
            }
        instance = fake_instance.fake_instance_obj(
                self.context,
                uuid='foo',
                vm_state=vm_states.ERROR,
                task_state=task_states.RESIZE_MIGRATING,
                power_state=power_state.SHUTDOWN,
                system_metadata=sys_meta,
                host=self.compute.host,
                expected_attrs=['system_metadata'])

        self.mox.StubOutWithMock(compute_utils, 'get_nw_info_for_instance')
        self.mox.StubOutWithMock(self.compute.driver, 'plug_vifs')
        self.mox.StubOutWithMock(self.compute.driver,
                                 'finish_revert_migration')
        self.mox.StubOutWithMock(self.compute,
                                 '_get_instance_block_device_info')
        self.mox.StubOutWithMock(self.compute.driver, 'get_info')
        self.mox.StubOutWithMock(instance, 'save')
        self.mox.StubOutWithMock(self.compute, '_retry_reboot')

        self.compute._retry_reboot(self.context, instance).AndReturn(
                                                                (False, None))
        compute_utils.get_nw_info_for_instance(instance).AndReturn(
            network_model.NetworkInfo())
        self.compute.driver.plug_vifs(instance, [])
        self.compute._get_instance_block_device_info(
            self.context, instance).AndReturn([])
        self.compute.driver.finish_revert_migration(self.context, instance,
                                                    [], [], power_on)
        instance.save()
        self.compute.driver.get_info(instance).AndReturn(
            hardware.InstanceInfo(state=power_state.SHUTDOWN))
        self.compute.driver.get_info(instance).AndReturn(
            hardware.InstanceInfo(state=power_state.SHUTDOWN))

        self.mox.ReplayAll()

        self.compute._init_instance(self.context, instance)
        self.assertIsNone(instance.task_state)

    def test_init_instance_reverts_crashed_migration_from_active(self):
        self._test_init_instance_reverts_crashed_migrations(
                                                old_vm_state=vm_states.ACTIVE)

    def test_init_instance_reverts_crashed_migration_from_stopped(self):
        self._test_init_instance_reverts_crashed_migrations(
                                                old_vm_state=vm_states.STOPPED)

    def test_init_instance_reverts_crashed_migration_no_old_state(self):
        self._test_init_instance_reverts_crashed_migrations(old_vm_state=None)

    def test_init_instance_resets_crashed_live_migration(self):
        instance = fake_instance.fake_instance_obj(
                self.context,
                uuid='foo',
                vm_state=vm_states.ACTIVE,
                host=self.compute.host,
                task_state=task_states.MIGRATING)
        with contextlib.nested(
            mock.patch.object(instance, 'save'),
            mock.patch('nova.compute.utils.get_nw_info_for_instance',
                       return_value=network_model.NetworkInfo())
        ) as (save, get_nw_info):
            self.compute._init_instance(self.context, instance)
            save.assert_called_once_with(expected_task_state=['migrating'])
            get_nw_info.assert_called_once_with(instance)
        self.assertIsNone(instance.task_state)
        self.assertEqual(vm_states.ACTIVE, instance.vm_state)

    def _test_init_instance_sets_building_error(self, vm_state,
                                                task_state=None):
        instance = fake_instance.fake_instance_obj(
                self.context,
                uuid='foo',
                vm_state=vm_state,
                host=self.compute.host,
                task_state=task_state)
        with mock.patch.object(instance, 'save') as save:
            self.compute._init_instance(self.context, instance)
            save.assert_called_once_with()
        self.assertIsNone(instance.task_state)
        self.assertEqual(vm_states.ERROR, instance.vm_state)

    def test_init_instance_sets_building_error(self):
        self._test_init_instance_sets_building_error(vm_states.BUILDING)

    def test_init_instance_sets_rebuilding_errors(self):
        tasks = [task_states.REBUILDING,
                 task_states.REBUILD_BLOCK_DEVICE_MAPPING,
                 task_states.REBUILD_SPAWNING]
        vms = [vm_states.ACTIVE, vm_states.STOPPED]

        for vm_state in vms:
            for task_state in tasks:
                self._test_init_instance_sets_building_error(
                    vm_state, task_state)

    def _test_init_instance_sets_building_tasks_error(self, instance):
        instance.host = self.compute.host
        with mock.patch.object(instance, 'save') as save:
            self.compute._init_instance(self.context, instance)
            save.assert_called_once_with()
        self.assertIsNone(instance.task_state)
        self.assertEqual(vm_states.ERROR, instance.vm_state)

    def test_init_instance_sets_building_tasks_error_scheduling(self):
        instance = fake_instance.fake_instance_obj(
                self.context,
                uuid='foo',
                vm_state=None,
                task_state=task_states.SCHEDULING)
        self._test_init_instance_sets_building_tasks_error(instance)

    def test_init_instance_sets_building_tasks_error_block_device(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = None
        instance.task_state = task_states.BLOCK_DEVICE_MAPPING
        self._test_init_instance_sets_building_tasks_error(instance)

    def test_init_instance_sets_building_tasks_error_networking(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = None
        instance.task_state = task_states.NETWORKING
        self._test_init_instance_sets_building_tasks_error(instance)

    def test_init_instance_sets_building_tasks_error_spawning(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = None
        instance.task_state = task_states.SPAWNING
        self._test_init_instance_sets_building_tasks_error(instance)

    def _test_init_instance_cleans_image_states(self, instance):
        with mock.patch.object(instance, 'save') as save:
            self.compute._get_power_state = mock.Mock()
            self.compute.driver.post_interrupted_snapshot_cleanup = mock.Mock()
            instance.info_cache = None
            instance.power_state = power_state.RUNNING
            instance.host = self.compute.host
            self.compute._init_instance(self.context, instance)
            save.assert_called_once_with()
            self.compute.driver.post_interrupted_snapshot_cleanup.\
                    assert_called_once_with(self.context, instance)
        self.assertIsNone(instance.task_state)

    @mock.patch('nova.compute.manager.ComputeManager._get_power_state',
                return_value=power_state.RUNNING)
    @mock.patch.object(objects.BlockDeviceMappingList, 'get_by_instance_uuid')
    def _test_init_instance_cleans_task_states(self, powerstate, state,
            mock_get_uuid, mock_get_power_state):
        instance = objects.Instance(self.context)
        instance.uuid = 'fake-uuid'
        instance.info_cache = None
        instance.power_state = power_state.RUNNING
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = state
        instance.host = self.compute.host
        mock_get_power_state.return_value = powerstate

        self.compute._init_instance(self.context, instance)

        return instance

    def test_init_instance_cleans_image_state_pending_upload(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.IMAGE_PENDING_UPLOAD
        self._test_init_instance_cleans_image_states(instance)

    def test_init_instance_cleans_image_state_uploading(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.IMAGE_UPLOADING
        self._test_init_instance_cleans_image_states(instance)

    def test_init_instance_cleans_image_state_snapshot(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.IMAGE_SNAPSHOT
        self._test_init_instance_cleans_image_states(instance)

    def test_init_instance_cleans_image_state_snapshot_pending(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.IMAGE_SNAPSHOT_PENDING
        self._test_init_instance_cleans_image_states(instance)

    @mock.patch.object(objects.Instance, 'save')
    def test_init_instance_cleans_running_pausing(self, mock_save):
        instance = self._test_init_instance_cleans_task_states(
            power_state.RUNNING, task_states.PAUSING)
        mock_save.assert_called_once_with()
        self.assertEqual(vm_states.ACTIVE, instance.vm_state)
        self.assertIsNone(instance.task_state)

    @mock.patch.object(objects.Instance, 'save')
    def test_init_instance_cleans_running_unpausing(self, mock_save):
        instance = self._test_init_instance_cleans_task_states(
            power_state.RUNNING, task_states.UNPAUSING)
        mock_save.assert_called_once_with()
        self.assertEqual(vm_states.ACTIVE, instance.vm_state)
        self.assertIsNone(instance.task_state)

    @mock.patch('nova.compute.manager.ComputeManager.unpause_instance')
    def test_init_instance_cleans_paused_unpausing(self, mock_unpause):

        def fake_unpause(context, instance):
            instance.task_state = None

        mock_unpause.side_effect = fake_unpause
        instance = self._test_init_instance_cleans_task_states(
            power_state.PAUSED, task_states.UNPAUSING)
        mock_unpause.assert_called_once_with(self.context, instance)
        self.assertEqual(vm_states.ACTIVE, instance.vm_state)
        self.assertIsNone(instance.task_state)

    def test_init_instance_errors_when_not_migrating(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = vm_states.ERROR
        instance.task_state = task_states.IMAGE_UPLOADING
        instance.host = self.compute.host
        self.mox.StubOutWithMock(compute_utils, 'get_nw_info_for_instance')
        self.mox.ReplayAll()
        self.compute._init_instance(self.context, instance)
        self.mox.VerifyAll()

    def test_init_instance_deletes_error_deleting_instance(self):
        instance = fake_instance.fake_instance_obj(
                self.context,
                project_id='fake',
                uuid='fake-uuid',
                vcpus=1,
                memory_mb=64,
                vm_state=vm_states.ERROR,
                host=self.compute.host,
                task_state=task_states.DELETING)

        self.mox.StubOutWithMock(objects.BlockDeviceMappingList,
                                 'get_by_instance_uuid')
        self.mox.StubOutWithMock(self.compute, '_delete_instance')
        self.mox.StubOutWithMock(instance, 'obj_load_attr')
        self.mox.StubOutWithMock(objects.quotas, 'ids_from_instance')
        self.mox.StubOutWithMock(self.compute, '_create_reservations')

        bdms = []
        quotas = objects.quotas.Quotas(self.context)
        instance.obj_load_attr('metadata')
        instance.obj_load_attr('system_metadata')
        objects.BlockDeviceMappingList.get_by_instance_uuid(
                self.context, instance.uuid).AndReturn(bdms)
        objects.quotas.ids_from_instance(self.context, instance).AndReturn(
            (instance.project_id, instance.user_id))
        self.compute._create_reservations(self.context, instance,
                                          instance.project_id,
                                          instance.user_id).AndReturn(quotas)
        self.compute._delete_instance(self.context, instance, bdms,
                                      mox.IgnoreArg())
        self.mox.ReplayAll()

        self.compute._init_instance(self.context, instance)
        self.mox.VerifyAll()

    def test_init_instance_resize_prep(self):
        instance = fake_instance.fake_instance_obj(
                self.context,
                uuid='fake',
                vm_state=vm_states.ACTIVE,
                host=self.compute.host,
                task_state=task_states.RESIZE_PREP,
                power_state=power_state.RUNNING)

        with contextlib.nested(
            mock.patch.object(self.compute, '_get_power_state',
                              return_value=power_state.RUNNING),
            mock.patch.object(compute_utils, 'get_nw_info_for_instance'),
            mock.patch.object(instance, 'save', autospec=True)
        ) as (mock_get_power_state, mock_nw_info, mock_instance_save):
            self.compute._init_instance(self.context, instance)
            mock_instance_save.assert_called_once_with()
            self.assertIsNone(instance.task_state)

    @mock.patch('nova.context.RequestContext.elevated')
    @mock.patch('nova.compute.utils.get_nw_info_for_instance')
    @mock.patch(
        'nova.compute.manager.ComputeManager._get_instance_block_device_info')
    @mock.patch('nova.virt.driver.ComputeDriver.destroy')
    @mock.patch('nova.virt.driver.ComputeDriver.get_volume_connector')
    def _test_shutdown_instance_exception(self, exc, mock_connector,
            mock_destroy, mock_blk_device_info, mock_nw_info, mock_elevated):
        mock_connector.side_effect = exc
        mock_elevated.return_value = self.context
        instance = fake_instance.fake_instance_obj(
                self.context,
                uuid='fake',
                vm_state=vm_states.ERROR,
                task_state=task_states.DELETING)
        bdms = [mock.Mock(id=1, is_volume=True)]

        self.compute._shutdown_instance(self.context, instance, bdms,
                notify=False, try_deallocate_networks=False)

    def test_shutdown_instance_endpoint_not_found(self):
        exc = cinder_exception.EndpointNotFound
        self._test_shutdown_instance_exception(exc)

    def test_shutdown_instance_client_exception(self):
        exc = cinder_exception.ClientException
        self._test_shutdown_instance_exception(exc)

    def test_shutdown_instance_volume_not_found(self):
        exc = exception.VolumeNotFound
        self._test_shutdown_instance_exception(exc)

    def test_shutdown_instance_disk_not_found(self):
        exc = exception.DiskNotFound
        self._test_shutdown_instance_exception(exc)

    def _test_init_instance_retries_reboot(self, instance, reboot_type,
                                           return_power_state):
        instance.host = self.compute.host
        with contextlib.nested(
            mock.patch.object(self.compute, '_get_power_state',
                               return_value=return_power_state),
            mock.patch.object(self.compute, 'reboot_instance'),
            mock.patch.object(compute_utils, 'get_nw_info_for_instance')
          ) as (
            _get_power_state,
            reboot_instance,
            get_nw_info_for_instance
          ):
            self.compute._init_instance(self.context, instance)
            call = mock.call(self.context, instance, block_device_info=None,
                             reboot_type=reboot_type)
            reboot_instance.assert_has_calls([call])

    def test_init_instance_retries_reboot_pending(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.task_state = task_states.REBOOT_PENDING
        for state in vm_states.ALLOW_SOFT_REBOOT:
            instance.vm_state = state
            self._test_init_instance_retries_reboot(instance, 'SOFT',
                                                    power_state.RUNNING)

    def test_init_instance_retries_reboot_pending_hard(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.task_state = task_states.REBOOT_PENDING_HARD
        for state in vm_states.ALLOW_HARD_REBOOT:
            # NOTE(dave-mcnally) while a reboot of a vm in error state is
            # possible we don't attempt to recover an error during init
            if state == vm_states.ERROR:
                continue
            instance.vm_state = state
            self._test_init_instance_retries_reboot(instance, 'HARD',
                                                    power_state.RUNNING)

    def test_init_instance_retries_reboot_pending_soft_became_hard(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.task_state = task_states.REBOOT_PENDING
        for state in vm_states.ALLOW_HARD_REBOOT:
            # NOTE(dave-mcnally) while a reboot of a vm in error state is
            # possible we don't attempt to recover an error during init
            if state == vm_states.ERROR:
                continue
            instance.vm_state = state
            self._test_init_instance_retries_reboot(instance, 'HARD',
                                                    power_state.SHUTDOWN)
            self.assertEqual(task_states.REBOOT_PENDING_HARD,
                             instance.task_state)

    def test_init_instance_retries_reboot_started(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.REBOOT_STARTED
        self._test_init_instance_retries_reboot(instance, 'HARD',
                                                power_state.NOSTATE)

    def test_init_instance_retries_reboot_started_hard(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.REBOOT_STARTED_HARD
        self._test_init_instance_retries_reboot(instance, 'HARD',
                                                power_state.NOSTATE)

    def _test_init_instance_cleans_reboot_state(self, instance):
        instance.host = self.compute.host
        with contextlib.nested(
            mock.patch.object(self.compute, '_get_power_state',
                               return_value=power_state.RUNNING),
            mock.patch.object(instance, 'save', autospec=True),
            mock.patch.object(compute_utils, 'get_nw_info_for_instance')
          ) as (
            _get_power_state,
            instance_save,
            get_nw_info_for_instance
          ):
            self.compute._init_instance(self.context, instance)
            instance_save.assert_called_once_with()
            self.assertIsNone(instance.task_state)
            self.assertEqual(vm_states.ACTIVE, instance.vm_state)

    def test_init_instance_cleans_image_state_reboot_started(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.REBOOT_STARTED
        instance.power_state = power_state.RUNNING
        self._test_init_instance_cleans_reboot_state(instance)

    def test_init_instance_cleans_image_state_reboot_started_hard(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.REBOOT_STARTED_HARD
        instance.power_state = power_state.RUNNING
        self._test_init_instance_cleans_reboot_state(instance)

    def test_init_instance_retries_power_off(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.id = 1
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.POWERING_OFF
        instance.host = self.compute.host
        with mock.patch.object(self.compute, 'stop_instance'):
            self.compute._init_instance(self.context, instance)
            call = mock.call(self.context, instance, True)
            self.compute.stop_instance.assert_has_calls([call])

    def test_init_instance_retries_power_on(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.id = 1
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.POWERING_ON
        instance.host = self.compute.host
        with mock.patch.object(self.compute, 'start_instance'):
            self.compute._init_instance(self.context, instance)
            call = mock.call(self.context, instance)
            self.compute.start_instance.assert_has_calls([call])

    def test_init_instance_retries_power_on_silent_exception(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.id = 1
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.POWERING_ON
        instance.host = self.compute.host
        with mock.patch.object(self.compute, 'start_instance',
                              return_value=Exception):
            init_return = self.compute._init_instance(self.context, instance)
            call = mock.call(self.context, instance)
            self.compute.start_instance.assert_has_calls([call])
            self.assertIsNone(init_return)

    def test_init_instance_retries_power_off_silent_exception(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.id = 1
        instance.vm_state = vm_states.ACTIVE
        instance.task_state = task_states.POWERING_OFF
        instance.host = self.compute.host
        with mock.patch.object(self.compute, 'stop_instance',
                              return_value=Exception):
            init_return = self.compute._init_instance(self.context, instance)
            call = mock.call(self.context, instance, True)
            self.compute.stop_instance.assert_has_calls([call])
            self.assertIsNone(init_return)

    def test_get_instances_on_driver(self):
        driver_instances = []
        for x in range(10):
            driver_instances.append(fake_instance.fake_db_instance())

        self.mox.StubOutWithMock(self.compute.driver,
                'list_instance_uuids')
        self.mox.StubOutWithMock(db, 'instance_get_all_by_filters')

        self.compute.driver.list_instance_uuids().AndReturn(
                [inst['uuid'] for inst in driver_instances])
        db.instance_get_all_by_filters(
                self.context,
                {'uuid': [inst['uuid'] for
                          inst in driver_instances]},
                'created_at', 'desc', columns_to_join=None,
                limit=None, marker=None,
                use_slave=True).AndReturn(
                        driver_instances)

        self.mox.ReplayAll()

        result = self.compute._get_instances_on_driver(self.context)
        self.assertEqual([x['uuid'] for x in driver_instances],
                         [x['uuid'] for x in result])

    @mock.patch('nova.virt.driver.ComputeDriver.list_instance_uuids')
    @mock.patch('nova.db.api.instance_get_all_by_filters')
    def test_get_instances_on_driver_empty(self, mock_list, mock_db):
        mock_list.return_value = []

        result = self.compute._get_instances_on_driver(self.context)
        # instance_get_all_by_filters should not be called
        self.assertEqual(0, mock_db.call_count)
        self.assertEqual([],
                         [x['uuid'] for x in result])

    def test_get_instances_on_driver_fallback(self):
        # Test getting instances when driver doesn't support
        # 'list_instance_uuids'
        self.compute.host = 'host'
        filters = {'host': self.compute.host}

        self.flags(instance_name_template='inst-%i')

        all_instances = []
        driver_instances = []
        for x in range(10):
            instance = fake_instance.fake_db_instance(name='inst-%i' % x,
                                                      id=x)
            if x % 2:
                driver_instances.append(instance)
            all_instances.append(instance)

        self.mox.StubOutWithMock(self.compute.driver,
                'list_instance_uuids')
        self.mox.StubOutWithMock(self.compute.driver,
                'list_instances')
        self.mox.StubOutWithMock(db, 'instance_get_all_by_filters')

        self.compute.driver.list_instance_uuids().AndRaise(
                NotImplementedError())
        self.compute.driver.list_instances().AndReturn(
                [inst['name'] for inst in driver_instances])
        db.instance_get_all_by_filters(
                self.context, filters,
                'created_at', 'desc', columns_to_join=None,
                limit=None, marker=None,
                use_slave=True).AndReturn(all_instances)

        self.mox.ReplayAll()

        result = self.compute._get_instances_on_driver(self.context, filters)
        self.assertEqual([x['uuid'] for x in driver_instances],
                         [x['uuid'] for x in result])

    def test_instance_usage_audit(self):
        instances = [objects.Instance(uuid='foo')]

        @classmethod
        def fake_task_log(*a, **k):
            pass

        @classmethod
        def fake_get(*a, **k):
            return instances

        self.flags(instance_usage_audit=True)
        self.stubs.Set(objects.TaskLog, 'get', fake_task_log)
        self.stubs.Set(objects.InstanceList,
                       'get_active_by_window_joined', fake_get)
        self.stubs.Set(objects.TaskLog, 'begin_task', fake_task_log)
        self.stubs.Set(objects.TaskLog, 'end_task', fake_task_log)

        self.mox.StubOutWithMock(compute_utils, 'notify_usage_exists')
        compute_utils.notify_usage_exists(self.compute.notifier,
            self.context, instances[0], ignore_missing_network_data=False)
        self.mox.ReplayAll()
        self.compute._instance_usage_audit(self.context)

    @mock.patch.object(objects.InstanceList, 'get_by_host')
    def test_sync_power_states(self, mock_get):
        instance = mock.Mock()
        mock_get.return_value = [instance]
        with mock.patch.object(self.compute._sync_power_pool,
                               'spawn_n') as mock_spawn:
            self.compute._sync_power_states(mock.sentinel.context)
            mock_get.assert_called_with(mock.sentinel.context,
                                        self.compute.host, expected_attrs=[],
                                        use_slave=True)
            mock_spawn.assert_called_once_with(mock.ANY, instance)

    def _get_sync_instance(self, power_state, vm_state, task_state=None,
                           shutdown_terminate=False):
        instance = objects.Instance()
        instance.uuid = 'fake-uuid'
        instance.power_state = power_state
        instance.vm_state = vm_state
        instance.host = self.compute.host
        instance.task_state = task_state
        instance.shutdown_terminate = shutdown_terminate
        self.mox.StubOutWithMock(instance, 'refresh')
        self.mox.StubOutWithMock(instance, 'save')
        return instance

    def test_sync_instance_power_state_match(self):
        instance = self._get_sync_instance(power_state.RUNNING,
                                           vm_states.ACTIVE)
        instance.refresh(use_slave=False)
        self.mox.ReplayAll()
        self.compute._sync_instance_power_state(self.context, instance,
                                                power_state.RUNNING)

    def test_sync_instance_power_state_running_stopped(self):
        instance = self._get_sync_instance(power_state.RUNNING,
                                           vm_states.ACTIVE)
        instance.refresh(use_slave=False)
        instance.save()
        self.mox.ReplayAll()
        self.compute._sync_instance_power_state(self.context, instance,
                                                power_state.SHUTDOWN)
        self.assertEqual(instance.power_state, power_state.SHUTDOWN)

    def _test_sync_to_stop(self, power_state, vm_state, driver_power_state,
                           stop=True, force=False, shutdown_terminate=False):
        instance = self._get_sync_instance(
            power_state, vm_state, shutdown_terminate=shutdown_terminate)
        instance.refresh(use_slave=False)
        instance.save()
        self.mox.StubOutWithMock(self.compute.compute_api, 'stop')
        self.mox.StubOutWithMock(self.compute.compute_api, 'delete')
        self.mox.StubOutWithMock(self.compute.compute_api, 'force_stop')
        if shutdown_terminate:
            self.compute.compute_api.delete(self.context, instance)
        elif stop:
            if force:
                self.compute.compute_api.force_stop(self.context, instance)
            else:
                self.compute.compute_api.stop(self.context, instance)
        self.mox.ReplayAll()
        self.compute._sync_instance_power_state(self.context, instance,
                                                driver_power_state)
        self.mox.VerifyAll()
        self.mox.UnsetStubs()

    def test_sync_instance_power_state_to_stop(self):
        for ps in (power_state.SHUTDOWN, power_state.CRASHED,
                   power_state.SUSPENDED):
            self._test_sync_to_stop(power_state.RUNNING, vm_states.ACTIVE, ps)

        for ps in (power_state.SHUTDOWN, power_state.CRASHED):
            self._test_sync_to_stop(power_state.PAUSED, vm_states.PAUSED, ps,
                                    force=True)

        self._test_sync_to_stop(power_state.SHUTDOWN, vm_states.STOPPED,
                                power_state.RUNNING, force=True)

    def test_sync_instance_power_state_to_terminate(self):
        self._test_sync_to_stop(power_state.RUNNING, vm_states.ACTIVE,
                                power_state.SHUTDOWN,
                                force=False, shutdown_terminate=True)

    def test_sync_instance_power_state_to_no_stop(self):
        for ps in (power_state.PAUSED, power_state.NOSTATE):
            self._test_sync_to_stop(power_state.RUNNING, vm_states.ACTIVE, ps,
                                    stop=False)
        for vs in (vm_states.SOFT_DELETED, vm_states.DELETED):
            for ps in (power_state.NOSTATE, power_state.SHUTDOWN):
                self._test_sync_to_stop(power_state.RUNNING, vs, ps,
                                        stop=False)

    @mock.patch('nova.compute.manager.ComputeManager.'
                '_sync_instance_power_state')
    def test_query_driver_power_state_and_sync_pending_task(
            self, mock_sync_power_state):
        with mock.patch.object(self.compute.driver,
                               'get_info') as mock_get_info:
            db_instance = objects.Instance(uuid='fake-uuid',
                                           task_state=task_states.POWERING_OFF)
            self.compute._query_driver_power_state_and_sync(self.context,
                                                            db_instance)
            self.assertFalse(mock_get_info.called)
            self.assertFalse(mock_sync_power_state.called)

    @mock.patch('nova.compute.manager.ComputeManager.'
                '_sync_instance_power_state')
    def test_query_driver_power_state_and_sync_not_found_driver(
            self, mock_sync_power_state):
        error = exception.InstanceNotFound(instance_id=1)
        with mock.patch.object(self.compute.driver,
                               'get_info', side_effect=error) as mock_get_info:
            db_instance = objects.Instance(uuid='fake-uuid', task_state=None)
            self.compute._query_driver_power_state_and_sync(self.context,
                                                            db_instance)
            mock_get_info.assert_called_once_with(db_instance)
            mock_sync_power_state.assert_called_once_with(self.context,
                                                          db_instance,
                                                          power_state.NOSTATE,
                                                          use_slave=True)

    def test_run_pending_deletes(self):
        self.flags(instance_delete_interval=10)

        class FakeInstance(object):
            def __init__(self, uuid, name, smd):
                self.uuid = uuid
                self.name = name
                self.system_metadata = smd
                self.cleaned = False

            def __getitem__(self, name):
                return getattr(self, name)

            def save(self):
                pass

        a = FakeInstance('123', 'apple', {'clean_attempts': '100'})
        b = FakeInstance('456', 'orange', {'clean_attempts': '3'})
        c = FakeInstance('789', 'banana', {})

        self.mox.StubOutWithMock(objects.InstanceList,
                                 'get_by_filters')
        objects.InstanceList.get_by_filters(
            {'read_deleted': 'yes'},
            {'deleted': True, 'soft_deleted': False, 'host': 'fake-mini',
             'cleaned': False},
            expected_attrs=['info_cache', 'security_groups',
                            'system_metadata'],
            use_slave=True).AndReturn([a, b, c])

        self.mox.StubOutWithMock(self.compute.driver, 'delete_instance_files')
        self.compute.driver.delete_instance_files(
            mox.IgnoreArg()).AndReturn(True)
        self.compute.driver.delete_instance_files(
            mox.IgnoreArg()).AndReturn(False)

        self.mox.ReplayAll()

        self.compute._run_pending_deletes({})
        self.assertFalse(a.cleaned)
        self.assertEqual('100', a.system_metadata['clean_attempts'])
        self.assertTrue(b.cleaned)
        self.assertEqual('4', b.system_metadata['clean_attempts'])
        self.assertFalse(c.cleaned)
        self.assertEqual('1', c.system_metadata['clean_attempts'])

    @mock.patch.object(objects.Migration, 'obj_as_admin')
    @mock.patch.object(objects.Migration, 'save')
    @mock.patch.object(objects.MigrationList, 'get_by_filters')
    @mock.patch.object(objects.InstanceList, 'get_by_filters')
    def _test_cleanup_incomplete_migrations(self, inst_host,
                                            mock_inst_get_by_filters,
                                            mock_migration_get_by_filters,
                                            mock_save, mock_obj_as_admin):
        def fake_inst(context, uuid, host):
            inst = objects.Instance(context)
            inst.uuid = uuid
            inst.host = host
            return inst

        def fake_migration(uuid, status, inst_uuid, src_host, dest_host):
            migration = objects.Migration()
            migration.uuid = uuid
            migration.status = status
            migration.instance_uuid = inst_uuid
            migration.source_compute = src_host
            migration.dest_compute = dest_host
            return migration

        fake_instances = [fake_inst(self.context, '111', inst_host),
                          fake_inst(self.context, '222', inst_host)]

        fake_migrations = [fake_migration('123', 'error', '111',
                                          'fake-host', 'fake-mini'),
                           fake_migration('456', 'error', '222',
                                          'fake-host', 'fake-mini')]

        mock_migration_get_by_filters.return_value = fake_migrations
        mock_inst_get_by_filters.return_value = fake_instances

        with mock.patch.object(self.compute.driver, 'delete_instance_files'):
            self.compute._cleanup_incomplete_migrations(self.context)

        # Ensure that migration status is set to 'failed' after instance
        # files deletion for those instances whose instance.host is not
        # same as compute host where periodic task is running.
        for inst in fake_instances:
            if inst.host != CONF.host:
                for mig in fake_migrations:
                    if inst.uuid == mig.instance_uuid:
                        self.assertEqual('failed', mig.status)

    def test_cleanup_incomplete_migrations_dest_node(self):
        """Test to ensure instance files are deleted from destination node.

        If instance gets deleted during resizing/revert-resizing operation,
        in that case instance files gets deleted from instance.host (source
        host here), but there is possibility that instance files could be
        present on destination node.
        This test ensures that `_cleanup_incomplete_migration` periodic
        task deletes orphaned instance files from destination compute node.
        """
        self.flags(host='fake-mini')
        self._test_cleanup_incomplete_migrations('fake-host')

    def test_cleanup_incomplete_migrations_source_node(self):
        """Test to ensure instance files are deleted from source node.

        If instance gets deleted during resizing/revert-resizing operation,
        in that case instance files gets deleted from instance.host (dest
        host here), but there is possibility that instance files could be
        present on source node.
        This test ensures that `_cleanup_incomplete_migration` periodic
        task deletes orphaned instance files from source compute node.
        """
        self.flags(host='fake-host')
        self._test_cleanup_incomplete_migrations('fake-mini')

    def test_attach_interface_failure(self):
        # Test that the fault methods are invoked when an attach fails
        db_instance = fake_instance.fake_db_instance()
        f_instance = objects.Instance._from_db_object(self.context,
                                                      objects.Instance(),
                                                      db_instance)
        e = exception.InterfaceAttachFailed(instance_uuid=f_instance.uuid)

        @mock.patch.object(compute_utils, 'add_instance_fault_from_exc')
        @mock.patch.object(self.compute.network_api,
                           'allocate_port_for_instance',
                           side_effect=e)
        @mock.patch.object(self.compute, '_instance_update',
                           side_effect=lambda *a, **k: {})
        def do_test(update, meth, add_fault):
            self.assertRaises(exception.InterfaceAttachFailed,
                              self.compute.attach_interface,
                              self.context, f_instance, 'net_id', 'port_id',
                              None)
            add_fault.assert_has_calls([
                    mock.call(self.context, f_instance, e,
                              mock.ANY)])

        do_test()

    def test_detach_interface_failure(self):
        # Test that the fault methods are invoked when a detach fails

        # Build test data that will cause a PortNotFound exception
        f_instance = mock.MagicMock()
        f_instance.info_cache = mock.MagicMock()
        f_instance.info_cache.network_info = []

        @mock.patch.object(compute_utils, 'add_instance_fault_from_exc')
        @mock.patch.object(self.compute, '_set_instance_obj_error_state')
        def do_test(meth, add_fault):
            self.assertRaises(exception.PortNotFound,
                              self.compute.detach_interface,
                              self.context, f_instance, 'port_id')
            add_fault.assert_has_calls(
                   [mock.call(self.context, f_instance, mock.ANY, mock.ANY)])

        do_test()

    def test_swap_volume_volume_api_usage(self):
        # This test ensures that volume_id arguments are passed to volume_api
        # and that volume states are OK
        volumes = {}
        old_volume_id = uuidutils.generate_uuid()
        volumes[old_volume_id] = {'id': old_volume_id,
                                  'display_name': 'old_volume',
                                  'status': 'detaching',
                                  'size': 1}
        new_volume_id = uuidutils.generate_uuid()
        volumes[new_volume_id] = {'id': new_volume_id,
                                  'display_name': 'new_volume',
                                  'status': 'available',
                                  'size': 2}

        def fake_vol_api_roll_detaching(context, volume_id):
            self.assertTrue(uuidutils.is_uuid_like(volume_id))
            if volumes[volume_id]['status'] == 'detaching':
                volumes[volume_id]['status'] = 'in-use'

        fake_bdm = fake_block_device.FakeDbBlockDeviceDict(
                   {'device_name': '/dev/vdb', 'source_type': 'volume',
                    'destination_type': 'volume', 'instance_uuid': 'fake',
                    'connection_info': '{"foo": "bar"}'})

        def fake_vol_api_func(context, volume, *args):
            self.assertTrue(uuidutils.is_uuid_like(volume))
            return {}

        def fake_vol_get(context, volume_id):
            self.assertTrue(uuidutils.is_uuid_like(volume_id))
            return volumes[volume_id]

        def fake_vol_unreserve(context, volume_id):
            self.assertTrue(uuidutils.is_uuid_like(volume_id))
            if volumes[volume_id]['status'] == 'attaching':
                volumes[volume_id]['status'] = 'available'

        def fake_vol_migrate_volume_completion(context, old_volume_id,
                                               new_volume_id, error=False):
            self.assertTrue(uuidutils.is_uuid_like(old_volume_id))
            self.assertTrue(uuidutils.is_uuid_like(new_volume_id))
            volumes[old_volume_id]['status'] = 'in-use'
            return {'save_volume_id': new_volume_id}

        def fake_func_exc(*args, **kwargs):
            raise AttributeError  # Random exception

        def fake_swap_volume(old_connection_info, new_connection_info,
                             instance, mountpoint, resize_to):
            self.assertEqual(resize_to, 2)

        def fake_block_device_mapping_update(ctxt, id, updates, legacy):
            self.assertEqual(2, updates['volume_size'])
            return fake_bdm

        self.stubs.Set(self.compute.volume_api, 'roll_detaching',
                       fake_vol_api_roll_detaching)
        self.stubs.Set(self.compute.volume_api, 'get', fake_vol_get)
        self.stubs.Set(self.compute.volume_api, 'initialize_connection',
                       fake_vol_api_func)
        self.stubs.Set(self.compute.volume_api, 'unreserve_volume',
                       fake_vol_unreserve)
        self.stubs.Set(self.compute.volume_api, 'terminate_connection',
                       fake_vol_api_func)
        self.stubs.Set(db, 'block_device_mapping_get_by_volume_id',
                       lambda x, y, z: fake_bdm)
        self.stubs.Set(self.compute.driver, 'get_volume_connector',
                       lambda x: {})
        self.stubs.Set(self.compute.driver, 'swap_volume',
                       fake_swap_volume)
        self.stubs.Set(self.compute.volume_api, 'migrate_volume_completion',
                      fake_vol_migrate_volume_completion)
        self.stubs.Set(db, 'block_device_mapping_update',
                       fake_block_device_mapping_update)
        self.stubs.Set(db,
                       'instance_fault_create',
                       lambda x, y:
                           test_instance_fault.fake_faults['fake-uuid'][0])
        self.stubs.Set(self.compute, '_instance_update',
                       lambda c, u, **k: {})

        # Good path
        self.compute.swap_volume(self.context, old_volume_id, new_volume_id,
                fake_instance.fake_instance_obj(
                    self.context, **{'uuid': 'fake'}))
        self.assertEqual(volumes[old_volume_id]['status'], 'in-use')

        # Error paths
        volumes[old_volume_id]['status'] = 'detaching'
        volumes[new_volume_id]['status'] = 'attaching'
        self.stubs.Set(self.compute.driver, 'swap_volume', fake_func_exc)
        self.assertRaises(AttributeError, self.compute.swap_volume,
                          self.context, old_volume_id, new_volume_id,
                          fake_instance.fake_instance_obj(
                                self.context, **{'uuid': 'fake'}))
        self.assertEqual(volumes[old_volume_id]['status'], 'in-use')
        self.assertEqual(volumes[new_volume_id]['status'], 'available')

        volumes[old_volume_id]['status'] = 'detaching'
        volumes[new_volume_id]['status'] = 'attaching'
        self.stubs.Set(self.compute.volume_api, 'initialize_connection',
                       fake_func_exc)
        self.assertRaises(AttributeError, self.compute.swap_volume,
                          self.context, old_volume_id, new_volume_id,
                          fake_instance.fake_instance_obj(
                                self.context, **{'uuid': 'fake'}))
        self.assertEqual(volumes[old_volume_id]['status'], 'in-use')
        self.assertEqual(volumes[new_volume_id]['status'], 'available')

    @mock.patch.object(compute_utils, 'EventReporter')
    def test_check_can_live_migrate_source(self, event_mock):
        is_volume_backed = 'volume_backed'
        dest_check_data = dict(foo='bar')
        db_instance = fake_instance.fake_db_instance()
        instance = objects.Instance._from_db_object(
                self.context, objects.Instance(), db_instance)
        expected_dest_check_data = dict(dest_check_data,
                                        is_volume_backed=is_volume_backed)

        self.mox.StubOutWithMock(self.compute.compute_api,
                                 'is_volume_backed_instance')
        self.mox.StubOutWithMock(self.compute,
                                 '_get_instance_block_device_info')
        self.mox.StubOutWithMock(self.compute.driver,
                                 'check_can_live_migrate_source')

        self.compute.compute_api.is_volume_backed_instance(
                self.context, instance).AndReturn(is_volume_backed)
        self.compute._get_instance_block_device_info(
                self.context, instance, refresh_conn_info=True
                ).AndReturn({'block_device_mapping': 'fake'})
        self.compute.driver.check_can_live_migrate_source(
                self.context, instance, expected_dest_check_data,
                {'block_device_mapping': 'fake'})

        self.mox.ReplayAll()

        self.compute.check_can_live_migrate_source(
                self.context, instance=instance,
                dest_check_data=dest_check_data)
        event_mock.assert_called_once_with(
            self.context, 'compute_check_can_live_migrate_source',
            instance.uuid)

    @mock.patch.object(compute_utils, 'EventReporter')
    def _test_check_can_live_migrate_destination(self, event_mock,
                                                 do_raise=False,
                                                 has_mig_data=False):
        db_instance = fake_instance.fake_db_instance(host='fake-host')
        instance = objects.Instance._from_db_object(
                self.context, objects.Instance(), db_instance)
        instance.host = 'fake-host'
        block_migration = 'block_migration'
        disk_over_commit = 'disk_over_commit'
        src_info = 'src_info'
        dest_info = 'dest_info'
        dest_check_data = dict(foo='bar')
        mig_data = dict(cow='moo')
        expected_result = dict(mig_data)
        if has_mig_data:
            dest_check_data['migrate_data'] = dict(cat='meow')
            expected_result.update(cat='meow')

        self.mox.StubOutWithMock(self.compute, '_get_compute_info')
        self.mox.StubOutWithMock(self.compute.driver,
                                 'check_can_live_migrate_destination')
        self.mox.StubOutWithMock(self.compute.compute_rpcapi,
                                 'check_can_live_migrate_source')
        self.mox.StubOutWithMock(self.compute.driver,
                                 'check_can_live_migrate_destination_cleanup')

        self.compute._get_compute_info(self.context,
                                       'fake-host').AndReturn(src_info)
        self.compute._get_compute_info(self.context,
                                       CONF.host).AndReturn(dest_info)
        self.compute.driver.check_can_live_migrate_destination(
                self.context, instance, src_info, dest_info,
                block_migration, disk_over_commit).AndReturn(dest_check_data)

        mock_meth = self.compute.compute_rpcapi.check_can_live_migrate_source(
                self.context, instance, dest_check_data)
        if do_raise:
            mock_meth.AndRaise(test.TestingException())
            self.mox.StubOutWithMock(db, 'instance_fault_create')
            db.instance_fault_create(
                self.context, mox.IgnoreArg()).AndReturn(
                    test_instance_fault.fake_faults['fake-uuid'][0])
        else:
            mock_meth.AndReturn(mig_data)
        self.compute.driver.check_can_live_migrate_destination_cleanup(
                self.context, dest_check_data)

        self.mox.ReplayAll()

        result = self.compute.check_can_live_migrate_destination(
                self.context, instance=instance,
                block_migration=block_migration,
                disk_over_commit=disk_over_commit)
        self.assertEqual(expected_result, result)
        event_mock.assert_called_once_with(
            self.context, 'compute_check_can_live_migrate_destination',
            instance.uuid)

    def test_check_can_live_migrate_destination_success(self):
        self._test_check_can_live_migrate_destination()

    def test_check_can_live_migrate_destination_success_w_mig_data(self):
        self._test_check_can_live_migrate_destination(has_mig_data=True)

    def test_check_can_live_migrate_destination_fail(self):
        self.assertRaises(
                test.TestingException,
                self._test_check_can_live_migrate_destination,
                do_raise=True)

    @mock.patch('nova.compute.manager.InstanceEvents._lock_name')
    def test_prepare_for_instance_event(self, lock_name_mock):
        inst_obj = objects.Instance(uuid='foo')
        result = self.compute.instance_events.prepare_for_instance_event(
            inst_obj, 'test-event')
        self.assertIn('foo', self.compute.instance_events._events)
        self.assertIn('test-event',
                      self.compute.instance_events._events['foo'])
        self.assertEqual(
            result,
            self.compute.instance_events._events['foo']['test-event'])
        self.assertTrue(hasattr(result, 'send'))
        lock_name_mock.assert_called_once_with(inst_obj)

    @mock.patch('nova.compute.manager.InstanceEvents._lock_name')
    def test_pop_instance_event(self, lock_name_mock):
        event = eventlet_event.Event()
        self.compute.instance_events._events = {
            'foo': {
                'network-vif-plugged': event,
                }
            }
        inst_obj = objects.Instance(uuid='foo')
        event_obj = objects.InstanceExternalEvent(name='network-vif-plugged',
                                                  tag=None)
        result = self.compute.instance_events.pop_instance_event(inst_obj,
                                                                 event_obj)
        self.assertEqual(result, event)
        lock_name_mock.assert_called_once_with(inst_obj)

    @mock.patch('nova.compute.manager.InstanceEvents._lock_name')
    def test_clear_events_for_instance(self, lock_name_mock):
        event = eventlet_event.Event()
        self.compute.instance_events._events = {
            'foo': {
                'test-event': event,
                }
            }
        inst_obj = objects.Instance(uuid='foo')
        result = self.compute.instance_events.clear_events_for_instance(
            inst_obj)
        self.assertEqual(result, {'test-event': event})
        lock_name_mock.assert_called_once_with(inst_obj)

    def test_instance_events_lock_name(self):
        inst_obj = objects.Instance(uuid='foo')
        result = self.compute.instance_events._lock_name(inst_obj)
        self.assertEqual(result, 'foo-events')

    def test_prepare_for_instance_event_again(self):
        inst_obj = objects.Instance(uuid='foo')
        self.compute.instance_events.prepare_for_instance_event(
            inst_obj, 'test-event')
        # A second attempt will avoid creating a new list; make sure we
        # get the current list
        result = self.compute.instance_events.prepare_for_instance_event(
            inst_obj, 'test-event')
        self.assertIn('foo', self.compute.instance_events._events)
        self.assertIn('test-event',
                      self.compute.instance_events._events['foo'])
        self.assertEqual(
            result,
            self.compute.instance_events._events['foo']['test-event'])
        self.assertTrue(hasattr(result, 'send'))

    def test_process_instance_event(self):
        event = eventlet_event.Event()
        self.compute.instance_events._events = {
            'foo': {
                'network-vif-plugged': event,
                }
            }
        inst_obj = objects.Instance(uuid='foo')
        event_obj = objects.InstanceExternalEvent(name='network-vif-plugged',
                                                  tag=None)
        self.compute._process_instance_event(inst_obj, event_obj)
        self.assertTrue(event.ready())
        self.assertEqual(event_obj, event.wait())
        self.assertEqual({}, self.compute.instance_events._events)

    def test_process_instance_vif_deleted_event(self):
        vif1 = fake_network_cache_model.new_vif()
        vif1['id'] = '1'
        vif2 = fake_network_cache_model.new_vif()
        vif2['id'] = '2'
        nw_info = network_model.NetworkInfo([vif1, vif2])
        info_cache = objects.InstanceInfoCache(network_info=nw_info,
                                               instance_uuid='uuid')
        inst_obj = objects.Instance(id=3, uuid='uuid', info_cache=info_cache)

        @mock.patch.object(manager.base_net_api,
                           'update_instance_cache_with_nw_info')
        @mock.patch.object(self.compute.driver, 'detach_interface')
        def do_test(detach_interface, update_instance_cache_with_nw_info):
            self.compute._process_instance_vif_deleted_event(self.context,
                                                             inst_obj,
                                                             vif2['id'])
            update_instance_cache_with_nw_info.assert_called_once_with(
                                                   self.compute.network_api,
                                                   self.context,
                                                   inst_obj,
                                                   nw_info=[vif1])
            detach_interface.assert_called_once_with(inst_obj, vif2)
        do_test()

    def test_external_instance_event(self):
        instances = [
            objects.Instance(id=1, uuid='uuid1'),
            objects.Instance(id=2, uuid='uuid2'),
            objects.Instance(id=3, uuid='uuid3')]
        events = [
            objects.InstanceExternalEvent(name='network-changed',
                                          tag='tag1',
                                          instance_uuid='uuid1'),
            objects.InstanceExternalEvent(name='network-vif-plugged',
                                          instance_uuid='uuid2',
                                          tag='tag2'),
            objects.InstanceExternalEvent(name='network-vif-deleted',
                                          instance_uuid='uuid3',
                                          tag='tag3')]

        @mock.patch.object(self.compute, '_process_instance_vif_deleted_event')
        @mock.patch.object(self.compute.network_api, 'get_instance_nw_info')
        @mock.patch.object(self.compute, '_process_instance_event')
        def do_test(_process_instance_event, get_instance_nw_info,
                    _process_instance_vif_deleted_event):
            self.compute.external_instance_event(self.context,
                                                 instances, events)
            get_instance_nw_info.assert_called_once_with(self.context,
                                                         instances[0])
            _process_instance_event.assert_called_once_with(instances[1],
                                                            events[1])
            _process_instance_vif_deleted_event.assert_called_once_with(
                self.context, instances[2], events[2].tag)
        do_test()

    def test_external_instance_event_with_exception(self):
        vif1 = fake_network_cache_model.new_vif()
        vif1['id'] = '1'
        vif2 = fake_network_cache_model.new_vif()
        vif2['id'] = '2'
        nw_info = network_model.NetworkInfo([vif1, vif2])
        info_cache = objects.InstanceInfoCache(network_info=nw_info,
                                               instance_uuid='uuid2')
        instances = [
            objects.Instance(id=1, uuid='uuid1'),
            objects.Instance(id=2, uuid='uuid2', info_cache=info_cache),
            objects.Instance(id=3, uuid='uuid3')]
        events = [
            objects.InstanceExternalEvent(name='network-changed',
                                          tag='tag1',
                                          instance_uuid='uuid1'),
            objects.InstanceExternalEvent(name='network-vif-deleted',
                                          instance_uuid='uuid2',
                                          tag='2'),
            objects.InstanceExternalEvent(name='network-vif-plugged',
                                          instance_uuid='uuid3',
                                          tag='tag3')]

        # Make sure all the three events are handled despite the exceptions in
        # processing events 1 and 2
        @mock.patch.object(manager.base_net_api,
                           'update_instance_cache_with_nw_info')
        @mock.patch.object(self.compute.driver, 'detach_interface',
                           side_effect=exception.NovaException)
        @mock.patch.object(self.compute.network_api, 'get_instance_nw_info',
                           side_effect=exception.InstanceInfoCacheNotFound(
                                                    instance_uuid='uuid1'))
        @mock.patch.object(self.compute, '_process_instance_event')
        def do_test(_process_instance_event, get_instance_nw_info,
                    detach_interface, update_instance_cache_with_nw_info):
            self.compute.external_instance_event(self.context,
                                                 instances, events)
            get_instance_nw_info.assert_called_once_with(self.context,
                                                         instances[0])
            update_instance_cache_with_nw_info.assert_called_once_with(
                                                   self.compute.network_api,
                                                   self.context,
                                                   instances[1],
                                                   nw_info=[vif1])
            detach_interface.assert_called_once_with(instances[1], vif2)
            _process_instance_event.assert_called_once_with(instances[2],
                                                            events[2])
        do_test()

    def test_cancel_all_events(self):
        inst = objects.Instance(uuid='uuid')
        fake_eventlet_event = mock.MagicMock()
        self.compute.instance_events._events = {
            inst.uuid: {
                'network-vif-plugged-bar': fake_eventlet_event,
            }
        }
        self.compute.instance_events.cancel_all_events()
        self.assertTrue(fake_eventlet_event.send.called)
        event = fake_eventlet_event.send.call_args_list[0][0][0]
        self.assertEqual('network-vif-plugged', event.name)
        self.assertEqual('bar', event.tag)
        self.assertEqual('failed', event.status)

    def test_cleanup_cancels_all_events(self):
        with mock.patch.object(self.compute, 'instance_events') as mock_ev:
            self.compute.cleanup_host()
            mock_ev.cancel_all_events.assert_called_once_with()

    def test_cleanup_blocks_new_events(self):
        instance = objects.Instance(uuid='uuid')
        self.compute.instance_events.cancel_all_events()
        callback = mock.MagicMock()
        body = mock.MagicMock()
        with self.compute.virtapi.wait_for_instance_event(
                instance, ['network-vif-plugged-bar'],
                error_callback=callback):
            body()
        self.assertTrue(body.called)
        callback.assert_called_once_with('network-vif-plugged-bar', instance)

    def test_pop_events_fails_gracefully(self):
        inst = objects.Instance(uuid='uuid')
        event = mock.MagicMock()
        self.compute.instance_events._events = None
        self.assertIsNone(
            self.compute.instance_events.pop_instance_event(inst, event))

    def test_clear_events_fails_gracefully(self):
        inst = objects.Instance(uuid='uuid')
        self.compute.instance_events._events = None
        self.assertEqual(
            self.compute.instance_events.clear_events_for_instance(inst), {})

    def test_retry_reboot_pending_soft(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.task_state = task_states.REBOOT_PENDING
        instance.vm_state = vm_states.ACTIVE
        with mock.patch.object(self.compute, '_get_power_state',
                               return_value=power_state.RUNNING):
            allow_reboot, reboot_type = self.compute._retry_reboot(
                                                             context, instance)
            self.assertTrue(allow_reboot)
            self.assertEqual(reboot_type, 'SOFT')

    def test_retry_reboot_pending_hard(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.task_state = task_states.REBOOT_PENDING_HARD
        instance.vm_state = vm_states.ACTIVE
        with mock.patch.object(self.compute, '_get_power_state',
                               return_value=power_state.RUNNING):
            allow_reboot, reboot_type = self.compute._retry_reboot(
                                                             context, instance)
            self.assertTrue(allow_reboot)
            self.assertEqual(reboot_type, 'HARD')

    def test_retry_reboot_starting_soft_off(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.task_state = task_states.REBOOT_STARTED
        with mock.patch.object(self.compute, '_get_power_state',
                               return_value=power_state.NOSTATE):
            allow_reboot, reboot_type = self.compute._retry_reboot(
                                                             context, instance)
            self.assertTrue(allow_reboot)
            self.assertEqual(reboot_type, 'HARD')

    def test_retry_reboot_starting_hard_off(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.task_state = task_states.REBOOT_STARTED_HARD
        with mock.patch.object(self.compute, '_get_power_state',
                               return_value=power_state.NOSTATE):
            allow_reboot, reboot_type = self.compute._retry_reboot(
                                                             context, instance)
            self.assertTrue(allow_reboot)
            self.assertEqual(reboot_type, 'HARD')

    def test_retry_reboot_starting_hard_on(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.task_state = task_states.REBOOT_STARTED_HARD
        with mock.patch.object(self.compute, '_get_power_state',
                               return_value=power_state.RUNNING):
            allow_reboot, reboot_type = self.compute._retry_reboot(
                                                             context, instance)
            self.assertFalse(allow_reboot)
            self.assertEqual(reboot_type, 'HARD')

    def test_retry_reboot_no_reboot(self):
        instance = objects.Instance(self.context)
        instance.uuid = 'foo'
        instance.task_state = 'bar'
        with mock.patch.object(self.compute, '_get_power_state',
                               return_value=power_state.RUNNING):
            allow_reboot, reboot_type = self.compute._retry_reboot(
                                                             context, instance)
            self.assertFalse(allow_reboot)
            self.assertEqual(reboot_type, 'HARD')

    @mock.patch('nova.objects.BlockDeviceMapping.get_by_volume_id')
    @mock.patch('nova.compute.manager.ComputeManager._driver_detach_volume')
    @mock.patch('nova.objects.Instance._from_db_object')
    def test_remove_volume_connection(self, inst_from_db, detach, bdm_get):
        bdm = mock.sentinel.bdm
        inst_obj = mock.sentinel.inst_obj
        bdm_get.return_value = bdm
        inst_from_db.return_value = inst_obj
        with mock.patch.object(self.compute, 'volume_api'):
            self.compute.remove_volume_connection(self.context, 'vol',
                                                  inst_obj)
        detach.assert_called_once_with(self.context, inst_obj, bdm)

    def test_detach_volume(self):
        self._test_detach_volume()

    def test_detach_volume_not_destroy_bdm(self):
        self._test_detach_volume(destroy_bdm=False)

    @mock.patch('nova.objects.BlockDeviceMapping.get_by_volume_id')
    @mock.patch('nova.compute.manager.ComputeManager._driver_detach_volume')
    @mock.patch('nova.compute.manager.ComputeManager.'
                '_notify_about_instance_usage')
    def _test_detach_volume(self, notify_inst_usage, detach,
                            bdm_get, destroy_bdm=True):
        volume_id = '123'
        inst_obj = mock.sentinel.inst_obj

        bdm = mock.MagicMock(spec=objects.BlockDeviceMapping)
        bdm.device_name = 'vdb'
        bdm_get.return_value = bdm

        with mock.patch.object(self.compute, 'volume_api') as volume_api:
            with mock.patch.object(self.compute, 'driver') as driver:
                connector_sentinel = mock.sentinel.connector
                driver.get_volume_connector.return_value = connector_sentinel

                self.compute._detach_volume(self.context, volume_id,
                                            inst_obj,
                                            destroy_bdm=destroy_bdm)

                detach.assert_called_once_with(self.context, inst_obj, bdm)
                driver.get_volume_connector.assert_called_once_with(inst_obj)
                volume_api.terminate_connection.assert_called_once_with(
                    self.context, volume_id, connector_sentinel)
                volume_api.detach.assert_called_once_with(mock.ANY, volume_id)
                notify_inst_usage.assert_called_once_with(
                    self.context, inst_obj, "volume.detach",
                    extra_usage_info={'volume_id': volume_id}
                )

                if destroy_bdm:
                    bdm.destroy.assert_called_once_with()
                else:
                    self.assertFalse(bdm.destroy.called)

    def _test_rescue(self, clean_shutdown=True):
        instance = fake_instance.fake_instance_obj(
            self.context, vm_state=vm_states.ACTIVE)
        fake_nw_info = network_model.NetworkInfo()
        rescue_image_meta = {'id': 'fake', 'name': 'fake'}
        with contextlib.nested(
            mock.patch.object(self.context, 'elevated',
                              return_value=self.context),
            mock.patch.object(self.compute.network_api, 'get_instance_nw_info',
                              return_value=fake_nw_info),
            mock.patch.object(self.compute, '_get_rescue_image',
                              return_value=rescue_image_meta),
            mock.patch.object(self.compute, '_notify_about_instance_usage'),
            mock.patch.object(self.compute, '_power_off_instance'),
            mock.patch.object(self.compute.driver, 'rescue'),
            mock.patch.object(compute_utils, 'notify_usage_exists'),
            mock.patch.object(self.compute, '_get_power_state',
                              return_value=power_state.RUNNING),
            mock.patch.object(instance, 'save')
        ) as (
            elevated_context, get_nw_info,
            get_rescue_image, notify_instance_usage, power_off_instance,
            driver_rescue, notify_usage_exists, get_power_state, instance_save
        ):
            self.compute.rescue_instance(
                self.context, instance, rescue_password='verybadpass',
                rescue_image_ref=None, clean_shutdown=clean_shutdown)

            # assert the field values on the instance object
            self.assertEqual(vm_states.RESCUED, instance.vm_state)
            self.assertIsNone(instance.task_state)
            self.assertEqual(power_state.RUNNING, instance.power_state)
            self.assertIsNotNone(instance.launched_at)

            # assert our mock calls
            get_nw_info.assert_called_once_with(self.context, instance)
            get_rescue_image.assert_called_once_with(
                self.context, instance, None)

            extra_usage_info = {'rescue_image_name': 'fake'}
            notify_calls = [
                mock.call(self.context, instance, "rescue.start",
                          extra_usage_info=extra_usage_info,
                          network_info=fake_nw_info),
                mock.call(self.context, instance, "rescue.end",
                          extra_usage_info=extra_usage_info,
                          network_info=fake_nw_info)
            ]
            notify_instance_usage.assert_has_calls(notify_calls)

            power_off_instance.assert_called_once_with(self.context, instance,
                                                       clean_shutdown)

            driver_rescue.assert_called_once_with(
                self.context, instance, fake_nw_info, rescue_image_meta,
                'verybadpass')

            notify_usage_exists.assert_called_once_with(self.compute.notifier,
                self.context, instance, current_period=True)

            instance_save.assert_called_once_with(
                expected_task_state=task_states.RESCUING)

    def test_rescue(self):
        self._test_rescue()

    def test_rescue_forced_shutdown(self):
        self._test_rescue(clean_shutdown=False)

    def test_unrescue(self):
        instance = fake_instance.fake_instance_obj(
            self.context, vm_state=vm_states.RESCUED)
        fake_nw_info = network_model.NetworkInfo()
        with contextlib.nested(
            mock.patch.object(self.context, 'elevated',
                              return_value=self.context),
            mock.patch.object(self.compute.network_api, 'get_instance_nw_info',
                              return_value=fake_nw_info),
            mock.patch.object(self.compute, '_notify_about_instance_usage'),
            mock.patch.object(self.compute.driver, 'unrescue'),
            mock.patch.object(self.compute, '_get_power_state',
                              return_value=power_state.RUNNING),
            mock.patch.object(instance, 'save')
        ) as (
            elevated_context, get_nw_info,
            notify_instance_usage, driver_unrescue, get_power_state,
            instance_save
        ):
            self.compute.unrescue_instance(self.context, instance)

            # assert the field values on the instance object
            self.assertEqual(vm_states.ACTIVE, instance.vm_state)
            self.assertIsNone(instance.task_state)
            self.assertEqual(power_state.RUNNING, instance.power_state)

            # assert our mock calls
            get_nw_info.assert_called_once_with(self.context, instance)

            notify_calls = [
                mock.call(self.context, instance, "unrescue.start",
                          network_info=fake_nw_info),
                mock.call(self.context, instance, "unrescue.end",
                          network_info=fake_nw_info)
            ]
            notify_instance_usage.assert_has_calls(notify_calls)

            driver_unrescue.assert_called_once_with(instance, fake_nw_info)

            instance_save.assert_called_once_with(
                expected_task_state=task_states.UNRESCUING)

    @mock.patch('nova.compute.manager.ComputeManager._get_power_state',
                return_value=power_state.RUNNING)
    @mock.patch.object(objects.Instance, 'save')
    @mock.patch('nova.utils.generate_password', return_value='fake-pass')
    def test_set_admin_password(self, gen_password_mock,
                                instance_save_mock, power_state_mock):
        # Ensure instance can have its admin password set.
        instance = fake_instance.fake_instance_obj(
            self.context,
            vm_state=vm_states.ACTIVE,
            task_state=task_states.UPDATING_PASSWORD)

        @mock.patch.object(self.context, 'elevated', return_value=self.context)
        @mock.patch.object(self.compute.driver, 'set_admin_password')
        def do_test(driver_mock, elevated_mock):
            # call the manager method
            self.compute.set_admin_password(self.context, instance, None)
            # make our assertions
            self.assertEqual(vm_states.ACTIVE, instance.vm_state)
            self.assertIsNone(instance.task_state)

            power_state_mock.assert_called_once_with(self.context, instance)
            driver_mock.assert_called_once_with(instance, 'fake-pass')
            instance_save_mock.assert_called_once_with(
                expected_task_state=task_states.UPDATING_PASSWORD)

        do_test()

    @mock.patch('nova.compute.manager.ComputeManager._get_power_state',
                return_value=power_state.NOSTATE)
    @mock.patch('nova.compute.manager.ComputeManager._instance_update')
    @mock.patch.object(objects.Instance, 'save')
    @mock.patch.object(compute_utils, 'add_instance_fault_from_exc')
    def test_set_admin_password_bad_state(self, add_fault_mock,
                                          instance_save_mock,
                                          update_mock,
                                          power_state_mock):
        # Test setting password while instance is rebuilding.
        instance = fake_instance.fake_instance_obj(self.context)
        with mock.patch.object(self.context, 'elevated',
                               return_value=self.context):
            # call the manager method
            self.assertRaises(exception.InstancePasswordSetFailed,
                              self.compute.set_admin_password,
                              self.context, instance, None)

        # make our assertions
        power_state_mock.assert_called_once_with(self.context, instance)
        instance_save_mock.assert_called_once_with(
            expected_task_state=task_states.UPDATING_PASSWORD)
        add_fault_mock.assert_called_once_with(
            self.context, instance, mock.ANY, mock.ANY)

    @mock.patch('nova.utils.generate_password', return_value='fake-pass')
    @mock.patch('nova.compute.manager.ComputeManager._get_power_state',
                return_value=power_state.RUNNING)
    @mock.patch('nova.compute.manager.ComputeManager._instance_update')
    @mock.patch.object(objects.Instance, 'save')
    @mock.patch.object(compute_utils, 'add_instance_fault_from_exc')
    def _do_test_set_admin_password_driver_error(self, exc,
                                                 expected_vm_state,
                                                 expected_task_state,
                                                 expected_exception,
                                                 add_fault_mock,
                                                 instance_save_mock,
                                                 update_mock,
                                                 power_state_mock,
                                                 gen_password_mock):
        # Ensure expected exception is raised if set_admin_password fails.
        instance = fake_instance.fake_instance_obj(
            self.context,
            vm_state=vm_states.ACTIVE,
            task_state=task_states.UPDATING_PASSWORD)

        @mock.patch.object(self.context, 'elevated', return_value=self.context)
        @mock.patch.object(self.compute.driver, 'set_admin_password',
                           side_effect=exc)
        def do_test(driver_mock, elevated_mock):
            # error raised from the driver should not reveal internal
            # information so a new error is raised
            self.assertRaises(expected_exception,
                              self.compute.set_admin_password,
                              self.context,
                              instance=instance,
                              new_pass=None)

            if expected_exception == NotImplementedError:
                instance_save_mock.assert_called_once_with(
                    expected_task_state=task_states.UPDATING_PASSWORD)
            else:
                # setting the instance to error state
                instance_save_mock.assert_called_once_with()

            self.assertEqual(expected_vm_state, instance.vm_state)
            # check revert_task_state decorator
            update_mock.assert_called_once_with(
                self.context, instance, task_state=expected_task_state)
            # check wrap_instance_fault decorator
            add_fault_mock.assert_called_once_with(
                self.context, instance, mock.ANY, mock.ANY)

        do_test()

    def test_set_admin_password_driver_not_authorized(self):
        # Ensure expected exception is raised if set_admin_password not
        # authorized.
        exc = exception.Forbidden('Internal error')
        expected_exception = exception.InstancePasswordSetFailed
        self._do_test_set_admin_password_driver_error(
            exc, vm_states.ERROR, None, expected_exception)

    def test_set_admin_password_driver_not_implemented(self):
        # Ensure expected exception is raised if set_admin_password not
        # implemented by driver.
        exc = NotImplementedError()
        expected_exception = NotImplementedError
        self._do_test_set_admin_password_driver_error(
            exc, vm_states.ACTIVE, None, expected_exception)

    def test_destroy_evacuated_instances(self):
        our_host = self.compute.host
        instance_1 = objects.Instance(self.context)
        instance_1.uuid = 'foo'
        instance_1.task_state = None
        instance_1.vm_state = vm_states.ACTIVE
        instance_1.host = 'not-' + our_host
        instance_2 = objects.Instance(self.context)
        instance_2.uuid = 'bar'
        instance_2.task_state = None
        instance_2.vm_state = vm_states.ACTIVE
        instance_2.host = 'not-' + our_host

        # Only instance 2 has a migration record
        migration = objects.Migration(instance_uuid=instance_2.uuid)

        with contextlib.nested(
            mock.patch.object(self.compute, '_get_instances_on_driver',
                               return_value=[instance_1,
                                             instance_2]),
            mock.patch.object(self.compute.network_api, 'get_instance_nw_info',
                               return_value=None),
            mock.patch.object(self.compute, '_get_instance_block_device_info',
                               return_value={}),
            mock.patch.object(self.compute, '_is_instance_storage_shared',
                               return_value=False),
            mock.patch.object(self.compute.driver, 'destroy'),
            mock.patch('nova.objects.MigrationList.get_by_filters'),
            mock.patch('nova.objects.Migration.save')
        ) as (_get_instances_on_driver, get_instance_nw_info,
              _get_instance_block_device_info, _is_instance_storage_shared,
              destroy, migration_list, migration_save):
            migration_list.return_value = [migration]
            self.compute._destroy_evacuated_instances(self.context)
            # Only instance 2 should be deleted. Instance 1 is still running
            # here, but no migration from our host exists, so ignore it
            destroy.assert_called_once_with(self.context, instance_2, None,
                                            {}, True)

    @mock.patch('nova.compute.manager.ComputeManager.'
                '_destroy_evacuated_instances')
    @mock.patch('nova.compute.manager.LOG')
    def test_init_host_foreign_instance(self, mock_log, mock_destroy):
        inst = mock.MagicMock()
        inst.host = self.compute.host + '-alt'
        self.compute._init_instance(mock.sentinel.context, inst)
        self.assertFalse(inst.save.called)
        self.assertTrue(mock_log.warning.called)
        msg = mock_log.warning.call_args_list[0]
        self.assertIn('appears to not be owned by this host', msg[0][0])

    @mock.patch('nova.compute.manager.ComputeManager._instance_update')
    def test_error_out_instance_on_exception_not_implemented_err(self,
                                                        inst_update_mock):
        instance = fake_instance.fake_instance_obj(self.context)

        def do_test():
            with self.compute._error_out_instance_on_exception(
                    self.context, instance, instance_state=vm_states.STOPPED):
                raise NotImplementedError('test')

        self.assertRaises(NotImplementedError, do_test)
        inst_update_mock.assert_called_once_with(
            self.context, instance,
            vm_state=vm_states.STOPPED, task_state=None)

    @mock.patch('nova.compute.manager.ComputeManager._instance_update')
    def test_error_out_instance_on_exception_inst_fault_rollback(self,
                                                        inst_update_mock):
        instance = fake_instance.fake_instance_obj(self.context)

        def do_test():
            with self.compute._error_out_instance_on_exception(self.context,
                                                               instance):
                raise exception.InstanceFaultRollback(
                    inner_exception=test.TestingException('test'))

        self.assertRaises(test.TestingException, do_test)
        inst_update_mock.assert_called_once_with(
            self.context, instance,
            vm_state=vm_states.ACTIVE, task_state=None)

    @mock.patch('nova.compute.manager.ComputeManager.'
                '_set_instance_obj_error_state')
    def test_error_out_instance_on_exception_unknown_with_quotas(self,
                                                                 set_error):
        instance = fake_instance.fake_instance_obj(self.context)
        quotas = mock.create_autospec(objects.Quotas, spec_set=True)

        def do_test():
            with self.compute._error_out_instance_on_exception(
                    self.context, instance, quotas):
                raise test.TestingException('test')

        self.assertRaises(test.TestingException, do_test)
        self.assertEqual(1, len(quotas.method_calls))
        self.assertEqual(mock.call.rollback(), quotas.method_calls[0])
        set_error.assert_called_once_with(self.context, instance)

    def test_cleanup_volumes(self):
        instance = fake_instance.fake_instance_obj(self.context)
        bdm_do_not_delete_dict = fake_block_device.FakeDbBlockDeviceDict(
            {'volume_id': 'fake-id1', 'source_type': 'image',
                'delete_on_termination': False})
        bdm_delete_dict = fake_block_device.FakeDbBlockDeviceDict(
            {'volume_id': 'fake-id2', 'source_type': 'image',
                'delete_on_termination': True})
        bdms = block_device_obj.block_device_make_list(self.context,
            [bdm_do_not_delete_dict, bdm_delete_dict])

        with mock.patch.object(self.compute.volume_api,
                'delete') as volume_delete:
            self.compute._cleanup_volumes(self.context, instance.uuid, bdms)
            volume_delete.assert_called_once_with(self.context,
                    bdms[1].volume_id)

    def test_cleanup_volumes_exception_do_not_raise(self):
        instance = fake_instance.fake_instance_obj(self.context)
        bdm_dict1 = fake_block_device.FakeDbBlockDeviceDict(
            {'volume_id': 'fake-id1', 'source_type': 'image',
                'delete_on_termination': True})
        bdm_dict2 = fake_block_device.FakeDbBlockDeviceDict(
            {'volume_id': 'fake-id2', 'source_type': 'image',
                'delete_on_termination': True})
        bdms = block_device_obj.block_device_make_list(self.context,
            [bdm_dict1, bdm_dict2])

        with mock.patch.object(self.compute.volume_api,
                'delete',
                side_effect=[test.TestingException(), None]) as volume_delete:
            self.compute._cleanup_volumes(self.context, instance.uuid, bdms,
                    raise_exc=False)
            calls = [mock.call(self.context, bdm.volume_id) for bdm in bdms]
            self.assertEqual(calls, volume_delete.call_args_list)

    def test_cleanup_volumes_exception_raise(self):
        instance = fake_instance.fake_instance_obj(self.context)
        bdm_dict1 = fake_block_device.FakeDbBlockDeviceDict(
            {'volume_id': 'fake-id1', 'source_type': 'image',
                'delete_on_termination': True})
        bdm_dict2 = fake_block_device.FakeDbBlockDeviceDict(
            {'volume_id': 'fake-id2', 'source_type': 'image',
                'delete_on_termination': True})
        bdms = block_device_obj.block_device_make_list(self.context,
            [bdm_dict1, bdm_dict2])

        with mock.patch.object(self.compute.volume_api,
                'delete',
                side_effect=[test.TestingException(), None]) as volume_delete:
            self.assertRaises(test.TestingException,
                    self.compute._cleanup_volumes, self.context, instance.uuid,
                    bdms)
            calls = [mock.call(self.context, bdm.volume_id) for bdm in bdms]
            self.assertEqual(calls, volume_delete.call_args_list)

    def test_stop_instance_task_state_none_power_state_shutdown(self):
        # Tests that stop_instance doesn't puke when the instance power_state
        # is shutdown and the task_state is None.
        instance = fake_instance.fake_instance_obj(
            self.context, vm_state=vm_states.ACTIVE,
            task_state=None, power_state=power_state.SHUTDOWN)

        @mock.patch.object(self.compute, '_get_power_state',
                           return_value=power_state.SHUTDOWN)
        @mock.patch.object(self.compute, '_notify_about_instance_usage')
        @mock.patch.object(self.compute, '_power_off_instance')
        @mock.patch.object(instance, 'save')
        def do_test(save_mock, power_off_mock, notify_mock, get_state_mock):
            # run the code
            self.compute.stop_instance(self.context, instance, True)
            # assert the calls
            self.assertEqual(2, get_state_mock.call_count)
            notify_mock.assert_has_calls([
                mock.call(self.context, instance, 'power_off.start'),
                mock.call(self.context, instance, 'power_off.end')
            ])
            power_off_mock.assert_called_once_with(
                self.context, instance, True)
            save_mock.assert_called_once_with(
                expected_task_state=[task_states.POWERING_OFF, None])
            self.assertEqual(power_state.SHUTDOWN, instance.power_state)
            self.assertIsNone(instance.task_state)
            self.assertEqual(vm_states.STOPPED, instance.vm_state)

        do_test()

    def test_reset_network_driver_not_implemented(self):
        instance = fake_instance.fake_instance_obj(self.context)

        @mock.patch.object(self.compute.driver, 'reset_network',
                           side_effect=NotImplementedError())
        @mock.patch.object(compute_utils, 'add_instance_fault_from_exc')
        def do_test(mock_add_fault, mock_reset):
            self.assertRaises(messaging.ExpectedException,
                              self.compute.reset_network,
                              self.context,
                              instance)

            self.compute = utils.ExceptionHelper(self.compute)

            self.assertRaises(NotImplementedError,
                              self.compute.reset_network,
                              self.context,
                              instance)

        do_test()

    def test_rebuild_default_impl(self):
        def _detach(context, bdms):
            # NOTE(rpodolyaka): check that instance has been powered off by
            # the time we detach block devices, exact calls arguments will be
            # checked below
            self.assertTrue(mock_power_off.called)
            self.assertFalse(mock_destroy.called)

        def _attach(context, instance, bdms, do_check_attach=True):
            return {'block_device_mapping': 'shared_block_storage'}

        def _spawn(context, instance, image_meta, injected_files,
              admin_password, network_info=None, block_device_info=None):
            self.assertEqual(block_device_info['block_device_mapping'],
                             'shared_block_storage')

        with contextlib.nested(
            mock.patch.object(self.compute.driver, 'destroy',
                              return_value=None),
            mock.patch.object(self.compute.driver, 'spawn',
                              side_effect=_spawn),
            mock.patch.object(objects.Instance, 'save',
                              return_value=None),
            mock.patch.object(self.compute, '_power_off_instance',
                              return_value=None)
        ) as(
             mock_destroy,
             mock_spawn,
             mock_save,
             mock_power_off
        ):
            instance = fake_instance.fake_instance_obj(self.context)
            instance.task_state = task_states.REBUILDING
            instance.save(expected_task_state=[task_states.REBUILDING])
            self.compute._rebuild_default_impl(self.context,
                                               instance,
                                               None,
                                               [],
                                               admin_password='new_pass',
                                               bdms=[],
                                               detach_block_devices=_detach,
                                               attach_block_devices=_attach,
                                               network_info=None,
                                               recreate=False,
                                               block_device_info=None,
                                               preserve_ephemeral=False)

            self.assertTrue(mock_save.called)
            self.assertTrue(mock_spawn.called)
            mock_destroy.assert_called_once_with(
                self.context, instance,
                network_info=None, block_device_info=None)
            mock_power_off.assert_called_once_with(
                self.context, instance, clean_shutdown=True)

    @mock.patch.object(utils, 'last_completed_audit_period',
            return_value=(0, 0))
    @mock.patch.object(time, 'time', side_effect=[10, 20, 21])
    @mock.patch.object(objects.InstanceList, 'get_by_host', return_value=[])
    @mock.patch.object(objects.BandwidthUsage, 'get_by_instance_uuid_and_mac')
    @mock.patch.object(db, 'bw_usage_update')
    def test_poll_bandwidth_usage(self, bw_usage_update, get_by_uuid_mac,
            get_by_host, time, last_completed_audit):
        bw_counters = [{'uuid': 'fake-uuid', 'mac_address': 'fake-mac',
                        'bw_in': 1, 'bw_out': 2}]
        usage = objects.BandwidthUsage()
        usage.bw_in = 3
        usage.bw_out = 4
        usage.last_ctr_in = 0
        usage.last_ctr_out = 0
        self.flags(bandwidth_poll_interval=1)
        get_by_uuid_mac.return_value = usage
        _time = timeutils.utcnow()
        bw_usage_update.return_value = {'uuid': '', 'mac': '',
                'start_period': _time, 'last_refreshed': _time, 'bw_in': 0,
                'bw_out': 0, 'last_ctr_in': 0, 'last_ctr_out': 0, 'deleted': 0,
                'created_at': _time, 'updated_at': _time, 'deleted_at': _time}
        with mock.patch.object(self.compute.driver,
                'get_all_bw_counters', return_value=bw_counters):
            self.compute._poll_bandwidth_usage(self.context)
            get_by_uuid_mac.assert_called_once_with(self.context, 'fake-uuid',
                    'fake-mac', start_period=0, use_slave=True)
            # NOTE(sdague): bw_usage_update happens at some time in
            # the future, so what last_refreshed is is irrelevant.
            bw_usage_update.assert_called_once_with(self.context, 'fake-uuid',
                    'fake-mac', 0, 4, 6, 1, 2,
                    last_refreshed=mock.ANY,
                    update_cells=False)

    def test_reverts_task_state_instance_not_found(self):
        # Tests that the reverts_task_state decorator in the compute manager
        # will not trace when an InstanceNotFound is raised.
        instance = objects.Instance(uuid='fake')
        instance_update_mock = mock.Mock(
            side_effect=exception.InstanceNotFound(instance_id=instance.uuid))
        self.compute._instance_update = instance_update_mock

        log_mock = mock.Mock()
        manager.LOG = log_mock

        @manager.reverts_task_state
        def fake_function(self, context, instance):
            raise test.TestingException()

        self.assertRaises(test.TestingException, fake_function,
                          self, self.context, instance)

        self.assertFalse(log_mock.called)

    @mock.patch.object(nova.scheduler.client.SchedulerClient,
                       'update_instance_info')
    def test_update_scheduler_instance_info(self, mock_update):
        instance = objects.Instance(uuid='fake')
        self.compute._update_scheduler_instance_info(self.context, instance)
        self.assertEqual(mock_update.call_count, 1)
        args = mock_update.call_args[0]
        self.assertNotEqual(args[0], self.context)
        self.assertIsInstance(args[0], self.context.__class__)
        self.assertEqual(args[1], self.compute.host)
        # Send a single instance; check that the method converts to an
        # InstanceList
        self.assertIsInstance(args[2], objects.InstanceList)
        self.assertEqual(args[2].objects[0], instance)

    @mock.patch.object(nova.scheduler.client.SchedulerClient,
                       'delete_instance_info')
    def test_delete_scheduler_instance_info(self, mock_delete):
        self.compute._delete_scheduler_instance_info(self.context,
                                                     mock.sentinel.inst_uuid)
        self.assertEqual(mock_delete.call_count, 1)
        args = mock_delete.call_args[0]
        self.assertNotEqual(args[0], self.context)
        self.assertIsInstance(args[0], self.context.__class__)
        self.assertEqual(args[1], self.compute.host)
        self.assertEqual(args[2], mock.sentinel.inst_uuid)

    @mock.patch.object(nova.context.RequestContext, 'elevated')
    @mock.patch.object(nova.objects.InstanceList, 'get_by_host')
    @mock.patch.object(nova.scheduler.client.SchedulerClient,
                       'sync_instance_info')
    def test_sync_scheduler_instance_info(self, mock_sync, mock_get_by_host,
            mock_elevated):
        inst1 = objects.Instance(uuid='fake1')
        inst2 = objects.Instance(uuid='fake2')
        inst3 = objects.Instance(uuid='fake3')
        exp_uuids = [inst.uuid for inst in [inst1, inst2, inst3]]
        mock_get_by_host.return_value = objects.InstanceList(
                objects=[inst1, inst2, inst3])
        fake_elevated = context.get_admin_context()
        mock_elevated.return_value = fake_elevated
        self.compute._sync_scheduler_instance_info(self.context)
        mock_get_by_host.assert_called_once_with(
                fake_elevated, self.compute.host, expected_attrs=[],
                use_slave=True)
        mock_sync.assert_called_once_with(fake_elevated, self.compute.host,
                                          exp_uuids)

    @mock.patch.object(nova.scheduler.client.SchedulerClient,
                       'sync_instance_info')
    @mock.patch.object(nova.scheduler.client.SchedulerClient,
                       'delete_instance_info')
    @mock.patch.object(nova.scheduler.client.SchedulerClient,
                       'update_instance_info')
    def test_scheduler_info_updates_off(self, mock_update, mock_delete,
                                        mock_sync):
        mgr = self.compute
        mgr.send_instance_updates = False
        mgr._update_scheduler_instance_info(self.context,
                                            mock.sentinel.instance)
        mgr._delete_scheduler_instance_info(self.context,
                                            mock.sentinel.instance_uuid)
        mgr._sync_scheduler_instance_info(self.context)
        # None of the calls should have been made
        self.assertFalse(mock_update.called)
        self.assertFalse(mock_delete.called)
        self.assertFalse(mock_sync.called)

    def test_refresh_instance_security_rules_takes_non_object(self):
        inst = fake_instance.fake_db_instance()
        with mock.patch.object(self.compute.driver,
                               'refresh_instance_security_rules') as mock_r:
            self.compute.refresh_instance_security_rules(self.context, inst)
            self.assertIsInstance(mock_r.call_args_list[0][0][0],
                                  objects.Instance)

    def test_set_instance_obj_error_state_with_clean_task_state(self):
        instance = fake_instance.fake_instance_obj(self.context,
            vm_state=vm_states.BUILDING, task_state=task_states.SPAWNING)
        with mock.patch.object(instance, 'save'):
            self.compute._set_instance_obj_error_state(self.context, instance,
                                                       clean_task_state=True)
            self.assertEqual(vm_states.ERROR, instance.vm_state)
            self.assertIsNone(instance.task_state)

    def test_set_instance_obj_error_state_by_default(self):
        instance = fake_instance.fake_instance_obj(self.context,
            vm_state=vm_states.BUILDING, task_state=task_states.SPAWNING)
        with mock.patch.object(instance, 'save'):
            self.compute._set_instance_obj_error_state(self.context, instance)
            self.assertEqual(vm_states.ERROR, instance.vm_state)
            self.assertEqual(task_states.SPAWNING, instance.task_state)

    @mock.patch.object(objects.Instance, 'save')
    def test_instance_update(self, mock_save):
        instance = objects.Instance(task_state=task_states.SCHEDULING,
                                    vm_state=vm_states.BUILDING)
        updates = {'task_state': None, 'vm_state': vm_states.ERROR}

        with mock.patch.object(self.compute,
                               '_update_resource_tracker') as mock_rt:
            self.compute._instance_update(self.context, instance, **updates)

            self.assertIsNone(instance.task_state)
            self.assertEqual(vm_states.ERROR, instance.vm_state)
            mock_save.assert_called_once_with()
            mock_rt.assert_called_once_with(self.context, instance)


class ComputeManagerBuildInstanceTestCase(test.NoDBTestCase):
    def setUp(self):
        super(ComputeManagerBuildInstanceTestCase, self).setUp()
        self.compute = importutils.import_object(CONF.compute_manager)
        self.context = context.RequestContext('fake', 'fake')
        self.instance = fake_instance.fake_instance_obj(self.context,
                vm_state=vm_states.ACTIVE,
                expected_attrs=['metadata', 'system_metadata', 'info_cache'])
        self.admin_pass = 'pass'
        self.injected_files = []
        self.image = {}
        self.node = 'fake-node'
        self.limits = {}
        self.requested_networks = []
        self.security_groups = []
        self.block_device_mapping = []
        self.filter_properties = {'retry': {'num_attempts': 1,
                                            'hosts': [[self.compute.host,
                                                       'fake-node']]}}

        def fake_network_info():
            return network_model.NetworkInfo([{'address': '1.2.3.4'}])

        self.network_info = network_model.NetworkInfoAsyncWrapper(
                fake_network_info)
        self.block_device_info = self.compute._prep_block_device(context,
                self.instance, self.block_device_mapping)

        # override tracker with a version that doesn't need the database:
        fake_rt = fake_resource_tracker.FakeResourceTracker(self.compute.host,
                    self.compute.driver, self.node)
        self.compute._resource_tracker_dict[self.node] = fake_rt

    def _do_build_instance_update(self, reschedule_update=False):
        self.mox.StubOutWithMock(self.instance, 'save')
        self.instance.save(
                expected_task_state=(task_states.SCHEDULING, None)).AndReturn(
                        self.instance)
        if reschedule_update:
            self.instance.save().AndReturn(self.instance)

    def _build_and_run_instance_update(self):
        self.mox.StubOutWithMock(self.instance, 'save')
        self._build_resources_instance_update(stub=False)
        self.instance.save(expected_task_state=
                task_states.BLOCK_DEVICE_MAPPING).AndReturn(self.instance)

    def _build_resources_instance_update(self, stub=True):
        if stub:
            self.mox.StubOutWithMock(self.instance, 'save')
        self.instance.save().AndReturn(self.instance)

    def _notify_about_instance_usage(self, event, stub=True, **kwargs):
        if stub:
            self.mox.StubOutWithMock(self.compute,
                    '_notify_about_instance_usage')
        self.compute._notify_about_instance_usage(self.context, self.instance,
                event, **kwargs)

    def _instance_action_events(self):
        self.mox.StubOutWithMock(objects.InstanceActionEvent, 'event_start')
        self.mox.StubOutWithMock(objects.InstanceActionEvent,
                                 'event_finish_with_failure')
        objects.InstanceActionEvent.event_start(
                self.context, self.instance.uuid, mox.IgnoreArg(),
                want_result=False)
        objects.InstanceActionEvent.event_finish_with_failure(
                self.context, self.instance.uuid, mox.IgnoreArg(),
                exc_val=mox.IgnoreArg(), exc_tb=mox.IgnoreArg(),
                want_result=False)

    @staticmethod
    def _assert_build_instance_hook_called(mock_hooks, result):
        # NOTE(coreywright): we want to test the return value of
        # _do_build_and_run_instance, but it doesn't bubble all the way up, so
        # mock the hooking, which allows us to test that too, though a little
        # too intimately
        mock_hooks.setdefault().run_post.assert_called_once_with(
            'build_instance', result, mock.ANY, mock.ANY, f=None)

    @mock.patch('nova.hooks._HOOKS')
    @mock.patch('nova.utils.spawn_n')
    def test_build_and_run_instance_called_with_proper_args(self, mock_spawn,
                                                            mock_hooks):
        mock_spawn.side_effect = lambda f, *a, **k: f(*a, **k)
        self.mox.StubOutWithMock(self.compute, '_build_and_run_instance')
        self._do_build_instance_update()
        self.compute._build_and_run_instance(self.context, self.instance,
                self.image, self.injected_files, self.admin_pass,
                self.requested_networks, self.security_groups,
                self.block_device_mapping, self.node, self.limits,
                self.filter_properties)
        self._instance_action_events()
        self.mox.ReplayAll()

        self.compute.build_and_run_instance(self.context, self.instance,
                self.image, request_spec={},
                filter_properties=self.filter_properties,
                injected_files=self.injected_files,
                admin_password=self.admin_pass,
                requested_networks=self.requested_networks,
                security_groups=self.security_groups,
                block_device_mapping=self.block_device_mapping, node=self.node,
                limits=self.limits)
        self._assert_build_instance_hook_called(mock_hooks,
                                                build_results.ACTIVE)

    # This test when sending an icehouse compatible rpc call to juno compute
    # node, NetworkRequest object can load from three items tuple.
    @mock.patch('nova.objects.Instance.save')
    @mock.patch('nova.compute.manager.ComputeManager._build_and_run_instance')
    @mock.patch('nova.utils.spawn_n')
    def test_build_and_run_instance_with_icehouse_requested_network(
            self, mock_spawn, mock_build_and_run, mock_save):
        fake_server_actions.stub_out_action_events(self.stubs)
        mock_spawn.side_effect = lambda f, *a, **k: f(*a, **k)
        mock_save.return_value = self.instance
        self.compute.build_and_run_instance(self.context, self.instance,
                self.image, request_spec={},
                filter_properties=self.filter_properties,
                injected_files=self.injected_files,
                admin_password=self.admin_pass,
                requested_networks=[objects.NetworkRequest(
                    network_id='fake_network_id',
                    address='10.0.0.1',
                    port_id='fake_port_id')],
                security_groups=self.security_groups,
                block_device_mapping=self.block_device_mapping, node=self.node,
                limits=self.limits)
        requested_network = mock_build_and_run.call_args[0][5][0]
        self.assertEqual('fake_network_id', requested_network.network_id)
        self.assertEqual('10.0.0.1', str(requested_network.address))
        self.assertEqual('fake_port_id', requested_network.port_id)

    @mock.patch('nova.hooks._HOOKS')
    @mock.patch('nova.utils.spawn_n')
    def test_build_abort_exception(self, mock_spawn, mock_hooks):
        def fake_spawn(f, *args, **kwargs):
            # NOTE(danms): Simulate the detached nature of spawn so that
            # we confirm that the inner task has the fault logic
            try:
                return f(*args, **kwargs)
            except Exception:
                pass

        mock_spawn.side_effect = fake_spawn

        self.mox.StubOutWithMock(self.compute, '_build_and_run_instance')
        self.mox.StubOutWithMock(self.compute, '_cleanup_allocated_networks')
        self.mox.StubOutWithMock(self.compute, '_cleanup_volumes')
        self.mox.StubOutWithMock(compute_utils, 'add_instance_fault_from_exc')
        self.mox.StubOutWithMock(self.compute,
                                 '_nil_out_instance_obj_host_and_node')
        self.mox.StubOutWithMock(self.compute, '_set_instance_obj_error_state')
        self.mox.StubOutWithMock(self.compute.compute_task_api,
                                 'build_instances')
        self._do_build_instance_update()
        self.compute._build_and_run_instance(self.context, self.instance,
                self.image, self.injected_files, self.admin_pass,
                self.requested_networks, self.security_groups,
                self.block_device_mapping, self.node, self.limits,
                self.filter_properties).AndRaise(
                        exception.BuildAbortException(reason='',
                            instance_uuid=self.instance.uuid))
        self.compute._cleanup_allocated_networks(self.context, self.instance,
                self.requested_networks)
        self.compute._cleanup_volumes(self.context, self.instance.uuid,
                self.block_device_mapping, raise_exc=False)
        compute_utils.add_instance_fault_from_exc(self.context,
                self.instance, mox.IgnoreArg(), mox.IgnoreArg())
        self.compute._nil_out_instance_obj_host_and_node(self.instance)
        self.compute._set_instance_obj_error_state(self.context, self.instance,
                                                   clean_task_state=True)
        self._instance_action_events()
        self.mox.ReplayAll()

        self.compute.build_and_run_instance(self.context, self.instance,
                self.image, request_spec={},
                filter_properties=self.filter_properties,
                injected_files=self.injected_files,
                admin_password=self.admin_pass,
                requested_networks=self.requested_networks,
                security_groups=self.security_groups,
                block_device_mapping=self.block_device_mapping, node=self.node,
                limits=self.limits)
        self._assert_build_instance_hook_called(mock_hooks,
                                                build_results.FAILED)

    @mock.patch('nova.hooks._HOOKS')
    @mock.patch('nova.utils.spawn_n')
    def test_rescheduled_exception(self, mock_spawn, mock_hooks):
        mock_spawn.side_effect = lambda f, *a, **k: f(*a, **k)
        self.mox.StubOutWithMock(self.compute, '_build_and_run_instance')
        self.mox.StubOutWithMock(self.compute, '_set_instance_obj_error_state')
        self.mox.StubOutWithMock(self.compute.compute_task_api,
                                 'build_instances')
        self.mox.StubOutWithMock(self.compute,
                                 '_nil_out_instance_obj_host_and_node')
        self.mox.StubOutWithMock(self.compute.network_api,
                                 'cleanup_instance_network_on_host')
        self._do_build_instance_update(reschedule_update=True)
        self.compute._build_and_run_instance(self.context, self.instance,
                self.image, self.injected_files, self.admin_pass,
                self.requested_networks, self.security_groups,
                self.block_device_mapping, self.node, self.limits,
                self.filter_properties).AndRaise(
                        exception.RescheduledException(reason='',
                            instance_uuid=self.instance.uuid))
        self.compute.network_api.cleanup_instance_network_on_host(self.context,
            self.instance, self.compute.host)
        self.compute._nil_out_instance_obj_host_and_node(self.instance)
        self.compute.compute_task_api.build_instances(self.context,
                [self.instance], self.image, self.filter_properties,
                self.admin_pass, self.injected_files, self.requested_networks,
                self.security_groups, self.block_device_mapping)
        self._instance_action_events()
        self.mox.ReplayAll()

        self.compute.build_and_run_instance(self.context, self.instance,
                self.image, request_spec={},
                filter_properties=self.filter_properties,
                injected_files=self.injected_files,
                admin_password=self.admin_pass,
                requested_networks=self.requested_networks,
                security_groups=self.security_groups,
                block_device_mapping=self.block_device_mapping, node=self.node,
                limits=self.limits)
        self._assert_build_instance_hook_called(mock_hooks,
                                                build_results.RESCHEDULED)

    def test_rescheduled_exception_with_non_ascii_exception(self):
        exc = exception.NovaException(u's\xe9quence')
        self.mox.StubOutWithMock(self.compute.driver, 'spawn')
        self.mox.StubOutWithMock(self.compute, '_build_networks_for_instance')
        self.mox.StubOutWithMock(self.compute, '_shutdown_instance')
        self.compute._build_networks_for_instance(self.context, self.instance,
                self.requested_networks, self.security_groups).AndReturn(
                        self.network_info)
        self.compute._shutdown_instance(self.context, self.instance,
                self.block_device_mapping, self.requested_networks,
                try_deallocate_networks=False)
        self._notify_about_instance_usage('create.start',
            extra_usage_info={'image_name': self.image.get('name')})
        self.compute.driver.spawn(self.context, self.instance, self.image,
                self.injected_files, self.admin_pass,
                network_info=self.network_info,
                block_device_info=self.block_device_info).AndRaise(exc)
        self._notify_about_instance_usage('create.error',
                fault=exc, stub=False)
        self.mox.ReplayAll()

        with mock.patch.object(self.instance, 'save') as mock_save:
            self.assertRaises(exception.RescheduledException,
                              self.compute._build_and_run_instance,
                              self.context, self.instance, self.image,
                              self.injected_files, self.admin_pass,
                              self.requested_networks, self.security_groups,
                              self.block_device_mapping, self.node,
                              self.limits, self.filter_properties)
            mock_save.assert_has_calls([
                mock.call(),
                mock.call(),
                mock.call(expected_task_state='block_device_mapping'),
            ])

    @mock.patch.object(manager.ComputeManager, '_build_and_run_instance')
    @mock.patch.object(conductor_api.ComputeTaskAPI, 'build_instances')
    @mock.patch.object(network_api.API, 'cleanup_instance_network_on_host')
    @mock.patch.object(objects.Instance, 'save')
    @mock.patch.object(objects.InstanceActionEvent, 'event_start')
    @mock.patch.object(objects.InstanceActionEvent,
                       'event_finish_with_failure')
    @mock.patch.object(virt_driver.ComputeDriver, 'macs_for_instance')
    def test_rescheduled_exception_with_network_allocated(self,
            mock_macs_for_instance, mock_event_finish,
            mock_event_start, mock_ins_save, mock_cleanup_network,
            mock_build_ins, mock_build_and_run):
        instance = fake_instance.fake_instance_obj(self.context,
                vm_state=vm_states.ACTIVE,
                system_metadata={'network_allocated': 'True'},
                expected_attrs=['metadata', 'system_metadata', 'info_cache'])
        mock_ins_save.return_value = instance
        mock_macs_for_instance.return_value = []
        mock_build_and_run.side_effect = exception.RescheduledException(
            reason='', instance_uuid=self.instance.uuid)

        self.compute._do_build_and_run_instance(self.context, instance,
            self.image, request_spec={},
            filter_properties=self.filter_properties,
            injected_files=self.injected_files,
            admin_password=self.admin_pass,
            requested_networks=self.requested_networks,
            security_groups=self.security_groups,
            block_device_mapping=self.block_device_mapping, node=self.node,
            limits=self.limits)

        mock_build_and_run.assert_called_once_with(self.context,
            instance,
            self.image, self.injected_files, self.admin_pass,
            self.requested_networks, self.security_groups,
            self.block_device_mapping, self.node, self.limits,
            self.filter_properties)
        mock_cleanup_network.assert_called_once_with(
            self.context, instance, self.compute.host)
        mock_build_ins.assert_called_once_with(self.context,
            [instance], self.image, self.filter_properties,
            self.admin_pass, self.injected_files, self.requested_networks,
            self.security_groups, self.block_device_mapping)

    @mock.patch('nova.hooks._HOOKS')
    @mock.patch('nova.utils.spawn_n')
    def test_rescheduled_exception_without_retry(self, mock_spawn, mock_hooks):
        mock_spawn.side_effect = lambda f, *a, **k: f(*a, **k)
        self.mox.StubOutWithMock(self.compute, '_build_and_run_instance')
        self.mox.StubOutWithMock(compute_utils, 'add_instance_fault_from_exc')
        self.mox.StubOutWithMock(self.compute, '_set_instance_obj_error_state')
        self.mox.StubOutWithMock(self.compute, '_cleanup_allocated_networks')
        self.mox.StubOutWithMock(self.compute, '_cleanup_volumes')
        self.mox.StubOutWithMock(self.compute,
                '_nil_out_instance_obj_host_and_node')
        self._do_build_instance_update()
        self.compute._build_and_run_instance(self.context, self.instance,
                self.image, self.injected_files, self.admin_pass,
                self.requested_networks, self.security_groups,
                self.block_device_mapping, self.node, self.limits,
                {}).AndRaise(
                        exception.RescheduledException(reason='',
                            instance_uuid=self.instance.uuid))
        self.compute._cleanup_allocated_networks(self.context, self.instance,
            self.requested_networks)
        compute_utils.add_instance_fault_from_exc(self.context, self.instance,
                mox.IgnoreArg(), mox.IgnoreArg())
        self.compute._nil_out_instance_obj_host_and_node(self.instance)
        self.compute._set_instance_obj_error_state(self.context, self.instance,
                                                   clean_task_state=True)
        self._instance_action_events()
        self.mox.ReplayAll()

        self.compute.build_and_run_instance(self.context, self.instance,
                self.image, request_spec={},
                filter_properties={},
                injected_files=self.injected_files,
                admin_password=self.admin_pass,
                requested_networks=self.requested_networks,
                security_groups=self.security_groups,
                block_device_mapping=self.block_device_mapping, node=self.node,
                limits=self.limits)
        self._assert_build_instance_hook_called(mock_hooks,
                                                build_results.FAILED)

    @mock.patch('nova.hooks._HOOKS')
    @mock.patch('nova.utils.spawn_n')
    def test_rescheduled_exception_do_not_deallocate_network(self, mock_spawn,
                                                             mock_hooks):
        mock_spawn.side_effect = lambda f, *a, **k: f(*a, **k)
        self.mox.StubOutWithMock(self.compute, '_build_and_run_instance')
        self.mox.StubOutWithMock(self.compute.driver,
                                 'deallocate_networks_on_reschedule')
        self.mox.StubOutWithMock(self.compute, '_cleanup_allocated_networks')
        self.mox.StubOutWithMock(self.compute,
                '_nil_out_instance_obj_host_and_node')
        self.mox.StubOutWithMock(self.compute.compute_task_api,
                'build_instances')
        self.mox.StubOutWithMock(self.compute.network_api,
                                 'cleanup_instance_network_on_host')
        self._do_build_instance_update(reschedule_update=True)
        self.compute._build_and_run_instance(self.context, self.instance,
                self.image, self.injected_files, self.admin_pass,
                self.requested_networks, self.security_groups,
                self.block_device_mapping, self.node, self.limits,
                self.filter_properties).AndRaise(
                        exception.RescheduledException(reason='',
                            instance_uuid=self.instance.uuid))
        self.compute.driver.deallocate_networks_on_reschedule(
                self.instance).AndReturn(False)
        self.compute.network_api.cleanup_instance_network_on_host(
            self.context, self.instance, self.compute.host)
        self.compute._nil_out_instance_obj_host_and_node(self.instance)
        self.compute.compute_task_api.build_instances(self.context,
                [self.instance], self.image, self.filter_properties,
                self.admin_pass, self.injected_files, self.requested_networks,
                self.security_groups, self.block_device_mapping)
        self._instance_action_events()
        self.mox.ReplayAll()

        self.compute.build_and_run_instance(self.context, self.instance,
                self.image, request_spec={},
                filter_properties=self.filter_properties,
                injected_files=self.injected_files,
                admin_password=self.admin_pass,
                requested_networks=self.requested_networks,
                security_groups=self.security_groups,
                block_device_mapping=self.block_device_mapping, node=self.node,
                limits=self.limits)
        self._assert_build_instance_hook_called(mock_hooks,
                                                build_results.RESCHEDULED)

    @mock.patch('nova.hooks._HOOKS')
    @mock.patch('nova.utils.spawn_n')
    def test_rescheduled_exception_deallocate_network(self, mock_spawn,
                                                      mock_hooks):
        mock_spawn.side_effect = lambda f, *a, **k: f(*a, **k)
        self.mox.StubOutWithMock(self.compute, '_build_and_run_instance')
        self.mox.StubOutWithMock(self.compute.driver,
                                 'deallocate_networks_on_reschedule')
        self.mox.StubOutWithMock(self.compute, '_cleanup_allocated_networks')
        self.mox.StubOutWithMock(self.compute,
                '_nil_out_instance_obj_host_and_node')
        self.mox.StubOutWithMock(self.compute.compute_task_api,
                'build_instances')
        self._do_build_instance_update(reschedule_update=True)
        self.compute._build_and_run_instance(self.context, self.instance,
                self.image, self.injected_files, self.admin_pass,
                self.requested_networks, self.security_groups,
                self.block_device_mapping, self.node, self.limits,
                self.filter_properties).AndRaise(
                        exception.RescheduledException(reason='',
                            instance_uuid=self.instance.uuid))
        self.compute.driver.deallocate_networks_on_reschedule(
                self.instance).AndReturn(True)
        self.compute._cleanup_allocated_networks(self.context, self.instance,
                self.requested_networks)
        self.compute._nil_out_instance_obj_host_and_node(self.instance)
        self.compute.compute_task_api.build_instances(self.context,
                [self.instance], self.image, self.filter_properties,
                self.admin_pass, self.injected_files, self.requested_networks,
                self.security_groups, self.block_device_mapping)
        self._instance_action_events()
        self.mox.ReplayAll()

        self.compute.build_and_run_instance(self.context, self.instance,
                self.image, request_spec={},
                filter_properties=self.filter_properties,
                injected_files=self.injected_files,
                admin_password=self.admin_pass,
                requested_networks=self.requested_networks,
                security_groups=self.security_groups,
                block_device_mapping=self.block_device_mapping, node=self.node,
                limits=self.limits)
        self._assert_build_instance_hook_called(mock_hooks,
                                                build_results.RESCHEDULED)

    def _test_build_and_run_exceptions(self, exc, set_error=False,
            cleanup_volumes=False, nil_out_host_and_node=False):
        self.mox.StubOutWithMock(self.compute, '_build_and_run_instance')
        self.mox.StubOutWithMock(self.compute, '_cleanup_allocated_networks')
        self.mox.StubOutWithMock(self.compute, '_cleanup_volumes')
        self.mox.StubOutWithMock(self.compute.compute_task_api,
                'build_instances')
        self._do_build_instance_update()
        self.compute._build_and_run_instance(self.context, self.instance,
                self.image, self.injected_files, self.admin_pass,
                self.requested_networks, self.security_groups,
                self.block_device_mapping, self.node, self.limits,
                self.filter_properties).AndRaise(exc)
        self.compute._cleanup_allocated_networks(self.context, self.instance,
                self.requested_networks)
        if cleanup_volumes:
            self.compute._cleanup_volumes(self.context, self.instance.uuid,
                    self.block_device_mapping, raise_exc=False)
        if nil_out_host_and_node:
            self.mox.StubOutWithMock(self.compute,
                    '_nil_out_instance_obj_host_and_node')
            self.compute._nil_out_instance_obj_host_and_node(self.instance)
        if set_error:
            self.mox.StubOutWithMock(self.compute,
                    '_set_instance_obj_error_state')
            self.mox.StubOutWithMock(compute_utils,
                    'add_instance_fault_from_exc')
            compute_utils.add_instance_fault_from_exc(self.context,
                    self.instance, mox.IgnoreArg(), mox.IgnoreArg())
            self.compute._set_instance_obj_error_state(self.context,
                    self.instance, clean_task_state=True)
        self._instance_action_events()
        self.mox.ReplayAll()

        with contextlib.nested(
            mock.patch('nova.utils.spawn_n'),
            mock.patch('nova.hooks._HOOKS')
        ) as (
            mock_spawn,
            mock_hooks
        ):
            mock_spawn.side_effect = lambda f, *a, **k: f(*a, **k)
            self.compute.build_and_run_instance(self.context, self.instance,
                self.image, request_spec={},
                filter_properties=self.filter_properties,
                injected_files=self.injected_files,
                admin_password=self.admin_pass,
                requested_networks=self.requested_networks,
                security_groups=self.security_groups,
                block_device_mapping=self.block_device_mapping, node=self.node,
                limits=self.limits)
            self._assert_build_instance_hook_called(mock_hooks,
                                                    build_results.FAILED)

    def test_build_and_run_notfound_exception(self):
        self._test_build_and_run_exceptions(exception.InstanceNotFound(
            instance_id=''))

    def test_build_and_run_unexpecteddeleting_exception(self):
        self._test_build_and_run_exceptions(
                exception.UnexpectedDeletingTaskStateError(
                    instance_uuid='fake_uuid', expected={}, actual={}))

    def test_build_and_run_buildabort_exception(self):
        self._test_build_and_run_exceptions(
            exception.BuildAbortException(instance_uuid='', reason=''),
            set_error=True, cleanup_volumes=True, nil_out_host_and_node=True)

    def test_build_and_run_unhandled_exception(self):
        self._test_build_and_run_exceptions(test.TestingException(),
                set_error=True, cleanup_volumes=True,
                nil_out_host_and_node=True)

    def test_instance_not_found(self):
        exc = exception.InstanceNotFound(instance_id=1)
        self.mox.StubOutWithMock(self.compute.driver, 'spawn')
        self.mox.StubOutWithMock(self.compute, '_build_networks_for_instance')
        self.mox.StubOutWithMock(self.compute, '_shutdown_instance')
        self.compute._build_networks_for_instance(self.context, self.instance,
                self.requested_networks, self.security_groups).AndReturn(
                        self.network_info)
        self.compute._shutdown_instance(self.context, self.instance,
                self.block_device_mapping, self.requested_networks,
                try_deallocate_networks=False)
        self._notify_about_instance_usage('create.start',
            extra_usage_info={'image_name': self.image.get('name')})
        self.compute.driver.spawn(self.context, self.instance, self.image,
                self.injected_files, self.admin_pass,
                network_info=self.network_info,
                block_device_info=self.block_device_info).AndRaise(exc)
        self._notify_about_instance_usage('create.end',
                fault=exc, stub=False)
        self.mox.ReplayAll()

        with mock.patch.object(self.instance, 'save') as mock_save:
            self.assertRaises(exception.InstanceNotFound,
                              self.compute._build_and_run_instance,
                              self.context, self.instance, self.image,
                              self.injected_files, self.admin_pass,
                              self.requested_networks, self.security_groups,
                              self.block_device_mapping, self.node,
                              self.limits, self.filter_properties)
            mock_save.assert_has_calls([
                mock.call(),
                mock.call(),
                mock.call(expected_task_state='block_device_mapping'),
                ])

    def test_reschedule_on_exception(self):
        self.mox.StubOutWithMock(self.compute.driver, 'spawn')
        self.mox.StubOutWithMock(self.compute, '_build_networks_for_instance')
        self.mox.StubOutWithMock(self.compute, '_shutdown_instance')
        self.compute._build_networks_for_instance(self.context, self.instance,
                self.requested_networks, self.security_groups).AndReturn(
                        self.network_info)
        self.compute._shutdown_instance(self.context, self.instance,
                self.block_device_mapping, self.requested_networks,
                try_deallocate_networks=False)
        self._notify_about_instance_usage('create.start',
            extra_usage_info={'image_name': self.image.get('name')})
        exc = test.TestingException()
        self.compute.driver.spawn(self.context, self.instance, self.image,
                self.injected_files, self.admin_pass,
                network_info=self.network_info,
                block_device_info=self.block_device_info).AndRaise(exc)
        self._notify_about_instance_usage('create.error',
            fault=exc, stub=False)
        self.mox.ReplayAll()

        with mock.patch.object(self.instance, 'save') as mock_save:
            self.assertRaises(exception.RescheduledException,
                              self.compute._build_and_run_instance,
                              self.context, self.instance, self.image,
                              self.injected_files, self.admin_pass,
                              self.requested_networks, self.security_groups,
                              self.block_device_mapping, self.node,
                              self.limits, self.filter_properties)
            mock_save.assert_has_calls([
                mock.call(),
                mock.call(),
                mock.call(expected_task_state='block_device_mapping'),
            ])

    def test_spawn_network_alloc_failure(self):
        # Because network allocation is asynchronous, failures may not present
        # themselves until the virt spawn method is called.
        self._test_build_and_run_spawn_exceptions(exception.NoMoreNetworks())

    def test_build_and_run_no_more_fixedips_exception(self):
        self._test_build_and_run_spawn_exceptions(
            exception.NoMoreFixedIps("error messge"))

    def test_build_and_run_flavor_disk_smaller_image_exception(self):
        self._test_build_and_run_spawn_exceptions(
            exception.FlavorDiskSmallerThanImage(
                flavor_size=0, image_size=1))

    def test_build_and_run_flavor_disk_smaller_min_disk(self):
        self._test_build_and_run_spawn_exceptions(
            exception.FlavorDiskSmallerThanMinDisk(
                flavor_size=0, image_min_disk=1))

    def test_build_and_run_flavor_memory_too_small_exception(self):
        self._test_build_and_run_spawn_exceptions(
            exception.FlavorMemoryTooSmall())

    def test_build_and_run_image_not_active_exception(self):
        self._test_build_and_run_spawn_exceptions(
            exception.ImageNotActive(image_id=self.image.get('id')))

    def test_build_and_run_image_unacceptable_exception(self):
        self._test_build_and_run_spawn_exceptions(
            exception.ImageUnacceptable(image_id=self.image.get('id'),
                                        reason=""))

    def _test_build_and_run_spawn_exceptions(self, exc):
        with contextlib.nested(
                mock.patch.object(self.compute.driver, 'spawn',
                    side_effect=exc),
                mock.patch.object(self.instance, 'save',
                    side_effect=[self.instance, self.instance, self.instance]),
                mock.patch.object(self.compute,
                    '_build_networks_for_instance',
                    return_value=network_model.NetworkInfo()),
                mock.patch.object(self.compute,
                    '_notify_about_instance_usage'),
                mock.patch.object(self.compute,
                    '_shutdown_instance'),
                mock.patch.object(self.compute,
                    '_validate_instance_group_policy')
        ) as (spawn, save,
                _build_networks_for_instance, _notify_about_instance_usage,
                _shutdown_instance, _validate_instance_group_policy):

            self.assertRaises(exception.BuildAbortException,
                    self.compute._build_and_run_instance, self.context,
                    self.instance, self.image, self.injected_files,
                    self.admin_pass, self.requested_networks,
                    self.security_groups, self.block_device_mapping, self.node,
                    self.limits, self.filter_properties)

            _validate_instance_group_policy.assert_called_once_with(
                    self.context, self.instance, self.filter_properties)
            _build_networks_for_instance.assert_has_calls(
                    [mock.call(self.context, self.instance,
                        self.requested_networks, self.security_groups)])

            _notify_about_instance_usage.assert_has_calls([
                mock.call(self.context, self.instance, 'create.start',
                    extra_usage_info={'image_name': self.image.get('name')}),
                mock.call(self.context, self.instance, 'create.error',
                    fault=exc)])

            save.assert_has_calls([
                mock.call(),
                mock.call(),
                mock.call(
                    expected_task_state=task_states.BLOCK_DEVICE_MAPPING)])

            spawn.assert_has_calls([mock.call(self.context, self.instance,
                self.image, self.injected_files, self.admin_pass,
                network_info=self.network_info,
                block_device_info=self.block_device_info)])

            _shutdown_instance.assert_called_once_with(self.context,
                    self.instance, self.block_device_mapping,
                    self.requested_networks, try_deallocate_networks=True)

    @mock.patch('nova.utils.spawn_n')
    def test_reschedule_on_resources_unavailable(self, mock_spawn):
        mock_spawn.side_effect = lambda f, *a, **k: f(*a, **k)
        reason = 'resource unavailable'
        exc = exception.ComputeResourcesUnavailable(reason=reason)

        class FakeResourceTracker(object):
            def instance_claim(self, context, instance, limits):
                raise exc

        self.mox.StubOutWithMock(self.compute, '_get_resource_tracker')
        self.mox.StubOutWithMock(self.compute.compute_task_api,
                'build_instances')
        self.mox.StubOutWithMock(self.compute.network_api,
                'cleanup_instance_network_on_host')
        self.mox.StubOutWithMock(self.compute,
                '_nil_out_instance_obj_host_and_node')
        self.compute._get_resource_tracker(self.node).AndReturn(
            FakeResourceTracker())
        self._do_build_instance_update(reschedule_update=True)
        self._notify_about_instance_usage('create.start',
            extra_usage_info={'image_name': self.image.get('name')})
        self._notify_about_instance_usage('create.error',
            fault=exc, stub=False)
        self.compute.network_api.cleanup_instance_network_on_host(
            self.context, self.instance, self.compute.host)
        self.compute._nil_out_instance_obj_host_and_node(self.instance)
        self.compute.compute_task_api.build_instances(self.context,
                [self.instance], self.image, self.filter_properties,
                self.admin_pass, self.injected_files, self.requested_networks,
                self.security_groups, self.block_device_mapping)
        self._instance_action_events()
        self.mox.ReplayAll()

        self.compute.build_and_run_instance(self.context, self.instance,
                self.image, request_spec={},
                filter_properties=self.filter_properties,
                injected_files=self.injected_files,
                admin_password=self.admin_pass,
                requested_networks=self.requested_networks,
                security_groups=self.security_groups,
                block_device_mapping=self.block_device_mapping, node=self.node,
                limits=self.limits)

    def test_build_resources_buildabort_reraise(self):
        exc = exception.BuildAbortException(
                instance_uuid=self.instance.uuid, reason='')
        self.mox.StubOutWithMock(self.compute, '_build_resources')
        self._notify_about_instance_usage('create.start',
            extra_usage_info={'image_name': self.image.get('name')})
        self.compute._build_resources(self.context, self.instance,
                self.requested_networks, self.security_groups, self.image,
                self.block_device_mapping).AndRaise(exc)
        self._notify_about_instance_usage('create.error',
            fault=exc, stub=False)
        self.mox.ReplayAll()
        with mock.patch.object(self.instance, 'save') as mock_save:
            self.assertRaises(exception.BuildAbortException,
                              self.compute._build_and_run_instance,
                              self.context,
                              self.instance, self.image, self.injected_files,
                              self.admin_pass, self.requested_networks,
                              self.security_groups, self.block_device_mapping,
                              self.node, self.limits, self.filter_properties)
            mock_save.assert_called_once_with()

    def test_build_resources_reraises_on_failed_bdm_prep(self):
        self.mox.StubOutWithMock(self.compute, '_prep_block_device')
        self.mox.StubOutWithMock(self.compute, '_build_networks_for_instance')
        self.compute._build_networks_for_instance(self.context, self.instance,
                self.requested_networks, self.security_groups).AndReturn(
                        self.network_info)
        self._build_resources_instance_update()
        self.compute._prep_block_device(self.context, self.instance,
                self.block_device_mapping).AndRaise(test.TestingException())
        self.mox.ReplayAll()

        try:
            with self.compute._build_resources(self.context, self.instance,
                    self.requested_networks, self.security_groups,
                    self.image, self.block_device_mapping):
                pass
        except Exception as e:
            self.assertIsInstance(e, exception.BuildAbortException)

    def test_failed_bdm_prep_from_delete_raises_unexpected(self):
        with contextlib.nested(
                mock.patch.object(self.compute,
                    '_build_networks_for_instance',
                    return_value=self.network_info),
                mock.patch.object(self.instance, 'save',
                    side_effect=exception.UnexpectedDeletingTaskStateError(
                        instance_uuid='fake_uuid',
                        actual={'task_state': task_states.DELETING},
                        expected={'task_state': None})),
        ) as (_build_networks_for_instance, save):

            try:
                with self.compute._build_resources(self.context, self.instance,
                        self.requested_networks, self.security_groups,
                        self.image, self.block_device_mapping):
                    pass
            except Exception as e:
                self.assertIsInstance(e,
                    exception.UnexpectedDeletingTaskStateError)

            _build_networks_for_instance.assert_has_calls(
                    [mock.call(self.context, self.instance,
                        self.requested_networks, self.security_groups)])

            save.assert_has_calls([mock.call()])

    def test_build_resources_aborts_on_failed_network_alloc(self):
        self.mox.StubOutWithMock(self.compute, '_build_networks_for_instance')
        self.compute._build_networks_for_instance(self.context, self.instance,
                self.requested_networks, self.security_groups).AndRaise(
                        test.TestingException())
        self.mox.ReplayAll()

        try:
            with self.compute._build_resources(self.context, self.instance,
                    self.requested_networks, self.security_groups, self.image,
                    self.block_device_mapping):
                pass
        except Exception as e:
            self.assertIsInstance(e, exception.BuildAbortException)

    def test_failed_network_alloc_from_delete_raises_unexpected(self):
        with mock.patch.object(self.compute,
                '_build_networks_for_instance') as _build_networks:

            exc = exception.UnexpectedDeletingTaskStateError
            _build_networks.side_effect = exc(
                instance_uuid='fake_uuid',
                actual={'task_state': task_states.DELETING},
                expected={'task_state': None})

            try:
                with self.compute._build_resources(self.context, self.instance,
                        self.requested_networks, self.security_groups,
                        self.image, self.block_device_mapping):
                    pass
            except Exception as e:
                self.assertIsInstance(e, exc)

            _build_networks.assert_has_calls(
                    [mock.call(self.context, self.instance,
                        self.requested_networks, self.security_groups)])

    def test_build_resources_with_network_info_obj_on_spawn_failure(self):
        self.mox.StubOutWithMock(self.compute, '_build_networks_for_instance')
        self.mox.StubOutWithMock(self.compute, '_shutdown_instance')
        self.compute._build_networks_for_instance(self.context, self.instance,
                self.requested_networks, self.security_groups).AndReturn(
                        network_model.NetworkInfo([{'address': '1.2.3.4'}]))
        self.compute._shutdown_instance(self.context, self.instance,
                self.block_device_mapping, self.requested_networks,
                try_deallocate_networks=False)
        self._build_resources_instance_update()
        self.mox.ReplayAll()

        test_exception = test.TestingException()

        def fake_spawn():
            raise test_exception

        try:
            with self.compute._build_resources(self.context, self.instance,
                    self.requested_networks, self.security_groups,
                    self.image, self.block_device_mapping):
                fake_spawn()
        except Exception as e:
            self.assertEqual(test_exception, e)

    def test_build_resources_cleans_up_and_reraises_on_spawn_failure(self):
        self.mox.StubOutWithMock(self.compute, '_build_networks_for_instance')
        self.mox.StubOutWithMock(self.compute, '_shutdown_instance')
        self.compute._build_networks_for_instance(self.context, self.instance,
                self.requested_networks, self.security_groups).AndReturn(
                        self.network_info)
        self.compute._shutdown_instance(self.context, self.instance,
                self.block_device_mapping, self.requested_networks,
                try_deallocate_networks=False)
        self._build_resources_instance_update()
        self.mox.ReplayAll()

        test_exception = test.TestingException()

        def fake_spawn():
            raise test_exception

        try:
            with self.compute._build_resources(self.context, self.instance,
                    self.requested_networks, self.security_groups,
                    self.image, self.block_device_mapping):
                fake_spawn()
        except Exception as e:
            self.assertEqual(test_exception, e)

    @mock.patch('nova.network.model.NetworkInfoAsyncWrapper.wait')
    @mock.patch(
        'nova.compute.manager.ComputeManager._build_networks_for_instance')
    @mock.patch('nova.objects.Instance.save')
    def test_build_resources_instance_not_found_before_yield(
            self, mock_save, mock_build_network, mock_info_wait):
        mock_build_network.return_value = self.network_info
        expected_exc = exception.InstanceNotFound(
            instance_id=self.instance.uuid)
        mock_save.side_effect = expected_exc
        try:
            with self.compute._build_resources(self.context, self.instance,
                    self.requested_networks, self.security_groups,
                    self.image, self.block_device_mapping):
                raise
        except Exception as e:
            self.assertEqual(expected_exc, e)
        mock_build_network.assert_called_once_with(self.context, self.instance,
                self.requested_networks, self.security_groups)
        mock_info_wait.assert_called_once_with(do_raise=False)

    @mock.patch('nova.network.model.NetworkInfoAsyncWrapper.wait')
    @mock.patch(
        'nova.compute.manager.ComputeManager._build_networks_for_instance')
    @mock.patch('nova.objects.Instance.save')
    def test_build_resources_unexpected_task_error_before_yield(
            self, mock_save, mock_build_network, mock_info_wait):
        mock_build_network.return_value = self.network_info
        mock_save.side_effect = exception.UnexpectedTaskStateError(
            instance_uuid='fake_uuid', expected={}, actual={})
        try:
            with self.compute._build_resources(self.context, self.instance,
                    self.requested_networks, self.security_groups,
                    self.image, self.block_device_mapping):
                raise
        except exception.BuildAbortException:
            pass
        mock_build_network.assert_called_once_with(self.context, self.instance,
                self.requested_networks, self.security_groups)
        mock_info_wait.assert_called_once_with(do_raise=False)

    @mock.patch('nova.network.model.NetworkInfoAsyncWrapper.wait')
    @mock.patch(
        'nova.compute.manager.ComputeManager._build_networks_for_instance')
    @mock.patch('nova.objects.Instance.save')
    def test_build_resources_exception_before_yield(
            self, mock_save, mock_build_network, mock_info_wait):
        mock_build_network.return_value = self.network_info
        mock_save.side_effect = Exception()
        try:
            with self.compute._build_resources(self.context, self.instance,
                    self.requested_networks, self.security_groups,
                    self.image, self.block_device_mapping):
                raise
        except exception.BuildAbortException:
            pass
        mock_build_network.assert_called_once_with(self.context, self.instance,
                self.requested_networks, self.security_groups)
        mock_info_wait.assert_called_once_with(do_raise=False)

    def test_build_resources_aborts_on_cleanup_failure(self):
        self.mox.StubOutWithMock(self.compute, '_build_networks_for_instance')
        self.mox.StubOutWithMock(self.compute, '_shutdown_instance')
        self.compute._build_networks_for_instance(self.context, self.instance,
                self.requested_networks, self.security_groups).AndReturn(
                        self.network_info)
        self.compute._shutdown_instance(self.context, self.instance,
                self.block_device_mapping, self.requested_networks,
                try_deallocate_networks=False).AndRaise(
                        test.TestingException())
        self._build_resources_instance_update()
        self.mox.ReplayAll()

        def fake_spawn():
            raise test.TestingException()

        try:
            with self.compute._build_resources(self.context, self.instance,
                    self.requested_networks, self.security_groups,
                    self.image, self.block_device_mapping):
                fake_spawn()
        except Exception as e:
            self.assertIsInstance(e, exception.BuildAbortException)

    def test_build_networks_if_not_allocated(self):
        instance = fake_instance.fake_instance_obj(self.context,
                system_metadata={},
                expected_attrs=['system_metadata'])

        self.mox.StubOutWithMock(self.compute.network_api,
                                 'get_instance_nw_info')
        self.mox.StubOutWithMock(self.compute, '_allocate_network')
        self.compute._allocate_network(self.context, instance,
                self.requested_networks, None, self.security_groups, None)
        self.mox.ReplayAll()

        self.compute._build_networks_for_instance(self.context, instance,
                self.requested_networks, self.security_groups)

    def test_build_networks_if_allocated_false(self):
        instance = fake_instance.fake_instance_obj(self.context,
                system_metadata=dict(network_allocated='False'),
                expected_attrs=['system_metadata'])

        self.mox.StubOutWithMock(self.compute.network_api,
                                 'get_instance_nw_info')
        self.mox.StubOutWithMock(self.compute, '_allocate_network')
        self.compute._allocate_network(self.context, instance,
                self.requested_networks, None, self.security_groups, None)
        self.mox.ReplayAll()

        self.compute._build_networks_for_instance(self.context, instance,
                self.requested_networks, self.security_groups)

    def test_return_networks_if_found(self):
        instance = fake_instance.fake_instance_obj(self.context,
                system_metadata=dict(network_allocated='True'),
                expected_attrs=['system_metadata'])

        def fake_network_info():
            return network_model.NetworkInfo([{'address': '123.123.123.123'}])

        self.mox.StubOutWithMock(self.compute.network_api,
                                 'get_instance_nw_info')
        self.mox.StubOutWithMock(self.compute, '_allocate_network')
        self.mox.StubOutWithMock(self.compute.network_api,
                                 'setup_instance_network_on_host')
        self.compute.network_api.setup_instance_network_on_host(
            self.context, instance, instance.host)
        self.compute.network_api.get_instance_nw_info(
            self.context, instance).AndReturn(
            network_model.NetworkInfoAsyncWrapper(fake_network_info))
        self.mox.ReplayAll()

        self.compute._build_networks_for_instance(self.context, instance,
                self.requested_networks, self.security_groups)

    def test_cleanup_allocated_networks_instance_not_found(self):
        with contextlib.nested(
                mock.patch.object(self.compute, '_deallocate_network'),
                mock.patch.object(self.instance, 'save',
                    side_effect=exception.InstanceNotFound(instance_id=''))
        ) as (_deallocate_network, save):
            # Testing that this doesn't raise an exeption
            self.compute._cleanup_allocated_networks(self.context,
                    self.instance, self.requested_networks)
            save.assert_called_once_with()
            self.assertEqual('False',
                    self.instance.system_metadata['network_allocated'])

    @mock.patch.object(manager.ComputeManager, '_instance_update')
    def test_launched_at_in_create_end_notification(self,
            mock_instance_update):

        def fake_notify(*args, **kwargs):
            if args[2] == 'create.end':
                # Check that launched_at is set on the instance
                self.assertIsNotNone(args[1].launched_at)

        with contextlib.nested(
                mock.patch.object(self.compute,
                    '_update_scheduler_instance_info'),
                mock.patch.object(self.compute.driver, 'spawn'),
                mock.patch.object(self.compute,
                    '_build_networks_for_instance', return_value=[]),
                mock.patch.object(self.instance, 'save'),
                mock.patch.object(self.compute, '_notify_about_instance_usage',
                    side_effect=fake_notify)
        ) as (mock_upd, mock_spawn, mock_networks, mock_save, mock_notify):
            self.compute._build_and_run_instance(self.context, self.instance,
                    self.image, self.injected_files, self.admin_pass,
                    self.requested_networks, self.security_groups,
                    self.block_device_mapping, self.node, self.limits,
                    self.filter_properties)
            expected_call = mock.call(self.context, self.instance,
                    'create.end', extra_usage_info={'message': u'Success'},
                    network_info=[])
            create_end_call = mock_notify.call_args_list[
                    mock_notify.call_count - 1]
            self.assertEqual(expected_call, create_end_call)

    def test_access_ip_set_when_instance_set_to_active(self):

        self.flags(default_access_ip_network_name='test1')
        instance = fake_instance.fake_db_instance()

        @mock.patch.object(db, 'instance_update_and_get_original',
                return_value=({}, instance))
        @mock.patch.object(self.compute.driver, 'spawn')
        @mock.patch.object(self.compute, '_build_networks_for_instance',
                return_value=fake_network.fake_get_instance_nw_info(
                    self.stubs))
        @mock.patch.object(db, 'instance_extra_update_by_uuid')
        @mock.patch.object(self.compute, '_notify_about_instance_usage')
        def _check_access_ip(mock_notify, mock_extra, mock_networks,
                mock_spawn, mock_db_update):
            self.compute._build_and_run_instance(self.context, self.instance,
                    self.image, self.injected_files, self.admin_pass,
                    self.requested_networks, self.security_groups,
                    self.block_device_mapping, self.node, self.limits,
                    self.filter_properties)

            updates = {'vm_state': u'active', 'access_ip_v6':
                    netaddr.IPAddress('2001:db8:0:1:dcad:beff:feef:1'),
                    'access_ip_v4': netaddr.IPAddress('192.168.1.100'),
                    'power_state': 0, 'task_state': None, 'launched_at':
                    mock.ANY, 'expected_task_state': 'spawning'}
            expected_call = mock.call(self.context, self.instance.uuid,
                    updates, columns_to_join=['metadata', 'system_metadata',
                        'info_cache'])
            last_update_call = mock_db_update.call_args_list[
                mock_db_update.call_count - 1]
            self.assertEqual(expected_call, last_update_call)

        _check_access_ip()

    @mock.patch.object(manager.ComputeManager, '_instance_update')
    def test_create_end_on_instance_delete(self, mock_instance_update):

        def fake_notify(*args, **kwargs):
            if args[2] == 'create.end':
                # Check that launched_at is set on the instance
                self.assertIsNotNone(args[1].launched_at)

        exc = exception.InstanceNotFound(instance_id='')

        with contextlib.nested(
                mock.patch.object(self.compute.driver, 'spawn'),
                mock.patch.object(self.compute,
                    '_build_networks_for_instance', return_value=[]),
                mock.patch.object(self.instance, 'save',
                    side_effect=[None, None, None, exc]),
                mock.patch.object(self.compute, '_notify_about_instance_usage',
                    side_effect=fake_notify)
        ) as (mock_spawn, mock_networks, mock_save, mock_notify):
            self.assertRaises(exception.InstanceNotFound,
                    self.compute._build_and_run_instance, self.context,
                    self.instance, self.image, self.injected_files,
                    self.admin_pass, self.requested_networks,
                    self.security_groups, self.block_device_mapping, self.node,
                    self.limits, self.filter_properties)
            expected_call = mock.call(self.context, self.instance,
                    'create.end', fault=exc)
            create_end_call = mock_notify.call_args_list[
                    mock_notify.call_count - 1]
            self.assertEqual(expected_call, create_end_call)


class ComputeManagerMigrationTestCase(test.NoDBTestCase):
    def setUp(self):
        super(ComputeManagerMigrationTestCase, self).setUp()
        self.compute = importutils.import_object(CONF.compute_manager)
        self.context = context.RequestContext('fake', 'fake')
        self.image = {}
        self.instance = fake_instance.fake_instance_obj(self.context,
                vm_state=vm_states.ACTIVE,
                expected_attrs=['metadata', 'system_metadata', 'info_cache'])
        self.migration = objects.Migration(context=self.context.elevated(),
                                           new_instance_type_id=7)
        self.migration.status = 'migrating'
        fake_server_actions.stub_out_action_events(self.stubs)

    @mock.patch.object(objects.Migration, 'save')
    @mock.patch.object(objects.Migration, 'obj_as_admin')
    def test_errors_out_migration_decorator(self, mock_save,
                                            mock_obj_as_admin):
        # Tests that errors_out_migration decorator in compute manager
        # sets migration status to 'error' when an exception is raised
        # from decorated method
        instance = fake_instance.fake_instance_obj(self.context)

        migration = objects.Migration()
        migration.instance_uuid = instance.uuid
        migration.status = 'migrating'
        migration.id = 0

        @manager.errors_out_migration
        def fake_function(self, context, instance, migration):
            raise test.TestingException()

        mock_obj_as_admin.return_value = mock.MagicMock()

        self.assertRaises(test.TestingException, fake_function,
                          self, self.context, instance, migration)
        self.assertEqual('error', migration.status)
        mock_save.assert_called_once_with()
        mock_obj_as_admin.assert_called_once_with()

    def test_finish_resize_failure(self):
        with contextlib.nested(
            mock.patch.object(self.compute, '_finish_resize',
                              side_effect=exception.ResizeError(reason='')),
            mock.patch.object(db, 'instance_fault_create'),
            mock.patch.object(self.compute, '_instance_update'),
            mock.patch.object(self.instance, 'save'),
            mock.patch.object(self.migration, 'save'),
            mock.patch.object(self.migration, 'obj_as_admin',
                              return_value=mock.MagicMock())
        ) as (meth, fault_create, instance_update, instance_save,
              migration_save, migration_obj_as_admin):
            fault_create.return_value = (
                test_instance_fault.fake_faults['fake-uuid'][0])
            self.assertRaises(
                exception.ResizeError, self.compute.finish_resize,
                context=self.context, disk_info=[], image=self.image,
                instance=self.instance, reservations=[],
                migration=self.migration
            )
            self.assertEqual("error", self.migration.status)
            migration_save.assert_called_once_with()
            migration_obj_as_admin.assert_called_once_with()

    def test_resize_instance_failure(self):
        self.migration.dest_host = None
        with contextlib.nested(
            mock.patch.object(self.compute.driver,
                              'migrate_disk_and_power_off',
                              side_effect=exception.ResizeError(reason='')),
            mock.patch.object(db, 'instance_fault_create'),
            mock.patch.object(self.compute, '_instance_update'),
            mock.patch.object(self.migration, 'save'),
            mock.patch.object(self.migration, 'obj_as_admin',
                              return_value=mock.MagicMock()),
            mock.patch.object(self.compute.network_api, 'get_instance_nw_info',
                              return_value=None),
            mock.patch.object(self.instance, 'save'),
            mock.patch.object(self.compute, '_notify_about_instance_usage'),
            mock.patch.object(self.compute,
                              '_get_instance_block_device_info',
                              return_value=None),
            mock.patch.object(objects.BlockDeviceMappingList,
                              'get_by_instance_uuid',
                              return_value=None),
            mock.patch.object(objects.Flavor,
                              'get_by_id',
                              return_value=None)
        ) as (meth, fault_create, instance_update,
              migration_save, migration_obj_as_admin, nw_info, save_inst,
              notify, vol_block_info, bdm, flavor):
            fault_create.return_value = (
                test_instance_fault.fake_faults['fake-uuid'][0])
            self.assertRaises(
                exception.ResizeError, self.compute.resize_instance,
                context=self.context, instance=self.instance, image=self.image,
                reservations=[], migration=self.migration,
                instance_type='type', clean_shutdown=True)
            self.assertEqual("error", self.migration.status)
            self.assertEqual([mock.call(), mock.call()],
                             migration_save.mock_calls)
            self.assertEqual([mock.call(), mock.call()],
                             migration_obj_as_admin.mock_calls)

    def _test_revert_resize_instance_destroy_disks(self, is_shared=False):

        # This test asserts that _is_instance_storage_shared() is called from
        # revert_resize() and the return value is passed to driver.destroy().
        # Otherwise we could regress this.

        @mock.patch.object(self.instance, 'revert_migration_context')
        @mock.patch.object(self.compute.network_api, 'get_instance_nw_info')
        @mock.patch.object(self.compute, '_is_instance_storage_shared')
        @mock.patch.object(self.compute, 'finish_revert_resize')
        @mock.patch.object(self.compute, '_instance_update')
        @mock.patch.object(self.compute, '_get_resource_tracker')
        @mock.patch.object(self.compute.driver, 'destroy')
        @mock.patch.object(self.compute.network_api, 'setup_networks_on_host')
        @mock.patch.object(self.compute.network_api, 'migrate_instance_start')
        @mock.patch.object(compute_utils, 'notify_usage_exists')
        @mock.patch.object(self.migration, 'save')
        @mock.patch.object(objects.BlockDeviceMappingList,
                           'get_by_instance_uuid')
        def do_test(get_by_instance_uuid,
                    migration_save,
                    notify_usage_exists,
                    migrate_instance_start,
                    setup_networks_on_host,
                    destroy,
                    _get_resource_tracker,
                    _instance_update,
                    finish_revert_resize,
                    _is_instance_storage_shared,
                    get_instance_nw_info,
                    revert_migration_context):

            self.migration.source_compute = self.instance['host']

            # Inform compute that instance uses non-shared or shared storage
            _is_instance_storage_shared.return_value = is_shared

            self.compute.revert_resize(context=self.context,
                                       migration=self.migration,
                                       instance=self.instance,
                                       reservations=None)

            _is_instance_storage_shared.assert_called_once_with(
                self.context, self.instance,
                host=self.migration.source_compute)

            # If instance storage is shared, driver destroy method
            # should not destroy disks otherwise it should destroy disks.
            destroy.assert_called_once_with(self.context, self.instance,
                                            mock.ANY, mock.ANY, not is_shared)

        do_test()

    def test_revert_resize_instance_destroy_disks_shared_storage(self):
        self._test_revert_resize_instance_destroy_disks(is_shared=True)

    def test_revert_resize_instance_destroy_disks_non_shared_storage(self):
        self._test_revert_resize_instance_destroy_disks(is_shared=False)

    def test_consoles_enabled(self):
        self.flags(enabled=False, group='vnc')
        self.flags(enabled=False, group='spice')
        self.flags(enabled=False, group='rdp')
        self.flags(enabled=False, group='serial_console')
        self.assertFalse(self.compute._consoles_enabled())

        self.flags(enabled=True, group='vnc')
        self.assertTrue(self.compute._consoles_enabled())
        self.flags(enabled=False, group='vnc')

        for console in ['spice', 'rdp', 'serial_console']:
            self.flags(enabled=True, group=console)
            self.assertTrue(self.compute._consoles_enabled())
            self.flags(enabled=False, group=console)

    @mock.patch('nova.utils.spawn_n')
    @mock.patch('nova.compute.manager.ComputeManager.'
                '_do_live_migration')
    def _test_max_concurrent_live(self, mock_lm, mock_spawn):
        mock_spawn.side_effect = lambda f, *a, **k: f(*a, **k)

        @mock.patch('nova.objects.Migration.save')
        def _do_it(mock_mig_save):
            instance = objects.Instance(uuid=str(uuid.uuid4()))
            migration = objects.Migration()
            self.compute.live_migration(self.context,
                                        mock.sentinel.dest,
                                        instance,
                                        mock.sentinel.block_migration,
                                        migration,
                                        mock.sentinel.migrate_data)
            self.assertEqual('queued', migration.status)
            migration.save.assert_called_once_with()

        with mock.patch.object(self.compute,
                               '_live_migration_semaphore') as mock_sem:
            for i in (1, 2, 3):
                _do_it()
        self.assertEqual(3, mock_sem.__enter__.call_count)

    def test_max_concurrent_live_limited(self):
        self.flags(max_concurrent_live_migrations=2)
        self._test_max_concurrent_live()

    def test_max_concurrent_live_unlimited(self):
        self.flags(max_concurrent_live_migrations=0)
        self._test_max_concurrent_live()

    def test_max_concurrent_live_semaphore_limited(self):
        self.flags(max_concurrent_live_migrations=123)
        self.assertEqual(
            123,
            manager.ComputeManager()._live_migration_semaphore.balance)

    def test_max_concurrent_live_semaphore_unlimited(self):
        self.flags(max_concurrent_live_migrations=0)
        compute = manager.ComputeManager()
        self.assertEqual(0, compute._live_migration_semaphore.balance)
        self.assertIsInstance(compute._live_migration_semaphore,
                              compute_utils.UnlimitedSemaphore)

    def test_max_concurrent_live_semaphore_negative(self):
        self.flags(max_concurrent_live_migrations=-2)
        compute = manager.ComputeManager()
        self.assertEqual(0, compute._live_migration_semaphore.balance)
        self.assertIsInstance(compute._live_migration_semaphore,
                              compute_utils.UnlimitedSemaphore)
