# Copyright 2011 OpenStack Foundation
# All Rights Reserved.
# Copyright 2013 Red Hat, Inc.
#
#    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.

"""Tests For miscellaneous util methods used with compute."""

import copy
import string
import uuid

import mock
from oslo_serialization import jsonutils
from oslo_utils import importutils
import six

from nova.compute import flavors
from nova.compute import power_state
from nova.compute import task_states
from nova.compute import utils as compute_utils
import nova.conf
from nova import context
from nova import exception
from nova.image import glance
from nova.network import api as network_api
from nova.network import model
from nova import objects
from nova.objects import block_device as block_device_obj
from nova import rpc
from nova import test
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_notifier
from nova.tests.unit import fake_server_actions
import nova.tests.unit.image.fake
from nova.tests.unit.objects import test_flavor
from nova.tests import uuidsentinel as uuids


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


def create_instance(context, user_id='fake', project_id='fake', params=None):
    """Create a test instance."""
    flavor = flavors.get_flavor_by_name('m1.tiny')
    net_info = model.NetworkInfo([])
    info_cache = objects.InstanceInfoCache(network_info=net_info)
    inst = objects.Instance(context=context,
                            image_ref=1,
                            reservation_id='r-fakeres',
                            user_id=user_id,
                            project_id=project_id,
                            instance_type_id=flavor.id,
                            flavor=flavor,
                            old_flavor=None,
                            new_flavor=None,
                            system_metadata={},
                            ami_launch_index=0,
                            root_gb=0,
                            ephemeral_gb=0,
                            info_cache=info_cache)
    if params:
        inst.update(params)
    inst.create()
    return inst


class ComputeValidateDeviceTestCase(test.NoDBTestCase):
    def setUp(self):
        super(ComputeValidateDeviceTestCase, self).setUp()
        self.context = context.RequestContext('fake', 'fake')
        # check if test name includes "xen"
        if 'xen' in self.id():
            self.flags(compute_driver='xenapi.XenAPIDriver')
            self.instance = objects.Instance(uuid=uuid.uuid4().hex,
                root_device_name=None,
                default_ephemeral_device=None)
        else:
            self.instance = objects.Instance(uuid=uuid.uuid4().hex,
                root_device_name='/dev/vda',
                default_ephemeral_device='/dev/vdb')

        flavor = objects.Flavor(**test_flavor.fake_flavor)
        self.instance.system_metadata = {}
        self.instance.flavor = flavor
        self.instance.default_swap_device = None

        self.data = []

        self.stub_out('nova.db.block_device_mapping_get_all_by_instance',
                      lambda context, instance: self.data)

    def _validate_device(self, device=None):
        bdms = objects.BlockDeviceMappingList.get_by_instance_uuid(
                self.context, self.instance['uuid'])
        return compute_utils.get_device_name_for_instance(
            self.instance, bdms, device)

    @staticmethod
    def _fake_bdm(device):
        return fake_block_device.FakeDbBlockDeviceDict({
            'source_type': 'volume',
            'destination_type': 'volume',
            'device_name': device,
            'no_device': None,
            'volume_id': 'fake',
            'snapshot_id': None,
            'guest_format': None
        })

    def test_wrap(self):
        self.data = []
        for letter in string.ascii_lowercase[2:]:
            self.data.append(self._fake_bdm('/dev/vd' + letter))
        device = self._validate_device()
        self.assertEqual(device, '/dev/vdaa')

    def test_wrap_plus_one(self):
        self.data = []
        for letter in string.ascii_lowercase[2:]:
            self.data.append(self._fake_bdm('/dev/vd' + letter))
        self.data.append(self._fake_bdm('/dev/vdaa'))
        device = self._validate_device()
        self.assertEqual(device, '/dev/vdab')

    def test_later(self):
        self.data = [
            self._fake_bdm('/dev/vdc'),
            self._fake_bdm('/dev/vdd'),
            self._fake_bdm('/dev/vde'),
        ]
        device = self._validate_device()
        self.assertEqual(device, '/dev/vdf')

    def test_gap(self):
        self.data = [
            self._fake_bdm('/dev/vdc'),
            self._fake_bdm('/dev/vde'),
        ]
        device = self._validate_device()
        self.assertEqual(device, '/dev/vdd')

    def test_no_bdms(self):
        self.data = []
        device = self._validate_device()
        self.assertEqual(device, '/dev/vdc')

    def test_lxc_names_work(self):
        self.instance['root_device_name'] = '/dev/a'
        self.instance['ephemeral_device_name'] = '/dev/b'
        self.data = []
        device = self._validate_device()
        self.assertEqual(device, '/dev/c')

    def test_name_conversion(self):
        self.data = []
        device = self._validate_device('/dev/c')
        self.assertEqual(device, '/dev/vdc')
        device = self._validate_device('/dev/sdc')
        self.assertEqual(device, '/dev/vdc')
        device = self._validate_device('/dev/xvdc')
        self.assertEqual(device, '/dev/vdc')

    def test_invalid_device_prefix(self):
        self.assertRaises(exception.InvalidDevicePath,
                          self._validate_device, '/baddata/vdc')

    def test_device_in_use(self):
        exc = self.assertRaises(exception.DevicePathInUse,
                          self._validate_device, '/dev/vda')
        self.assertIn('/dev/vda', six.text_type(exc))

    def test_swap(self):
        self.instance['default_swap_device'] = "/dev/vdc"
        device = self._validate_device()
        self.assertEqual(device, '/dev/vdd')

    def test_swap_no_ephemeral(self):
        self.instance.default_ephemeral_device = None
        self.instance.default_swap_device = "/dev/vdb"
        device = self._validate_device()
        self.assertEqual(device, '/dev/vdc')

    def test_ephemeral_xenapi(self):
        self.instance.flavor.ephemeral_gb = 10
        self.instance.flavor.swap = 0
        device = self._validate_device()
        self.assertEqual(device, '/dev/xvdc')

    def test_swap_xenapi(self):
        self.instance.flavor.ephemeral_gb = 0
        self.instance.flavor.swap = 10
        device = self._validate_device()
        self.assertEqual(device, '/dev/xvdb')

    def test_swap_and_ephemeral_xenapi(self):
        self.instance.flavor.ephemeral_gb = 10
        self.instance.flavor.swap = 10
        device = self._validate_device()
        self.assertEqual(device, '/dev/xvdd')

    def test_swap_and_one_attachment_xenapi(self):
        self.instance.flavor.ephemeral_gb = 0
        self.instance.flavor.swap = 10
        device = self._validate_device()
        self.assertEqual(device, '/dev/xvdb')
        self.data.append(self._fake_bdm(device))
        device = self._validate_device()
        self.assertEqual(device, '/dev/xvdd')

    def test_no_dev_root_device_name_get_next_name(self):
        self.instance['root_device_name'] = 'vda'
        device = self._validate_device()
        self.assertEqual('/dev/vdc', device)


class DefaultDeviceNamesForInstanceTestCase(test.NoDBTestCase):

    def setUp(self):
        super(DefaultDeviceNamesForInstanceTestCase, self).setUp()
        self.context = context.RequestContext('fake', 'fake')
        self.ephemerals = block_device_obj.block_device_make_list(
                self.context,
                [fake_block_device.FakeDbBlockDeviceDict(
                 {'id': 1,
                  'instance_uuid': uuids.block_device_instance,
                  'device_name': '/dev/vdb',
                  'source_type': 'blank',
                  'destination_type': 'local',
                  'delete_on_termination': True,
                  'guest_format': None,
                  'boot_index': -1})])

        self.swap = block_device_obj.block_device_make_list(
                self.context,
                [fake_block_device.FakeDbBlockDeviceDict(
                 {'id': 2,
                  'instance_uuid': uuids.block_device_instance,
                  'device_name': '/dev/vdc',
                  'source_type': 'blank',
                  'destination_type': 'local',
                  'delete_on_termination': True,
                  'guest_format': 'swap',
                  'boot_index': -1})])

        self.block_device_mapping = block_device_obj.block_device_make_list(
                self.context,
                [fake_block_device.FakeDbBlockDeviceDict(
                 {'id': 3,
                  'instance_uuid': uuids.block_device_instance,
                  'device_name': '/dev/vda',
                  'source_type': 'volume',
                  'destination_type': 'volume',
                  'volume_id': 'fake-volume-id-1',
                  'boot_index': 0}),
                 fake_block_device.FakeDbBlockDeviceDict(
                 {'id': 4,
                  'instance_uuid': uuids.block_device_instance,
                  'device_name': '/dev/vdd',
                  'source_type': 'snapshot',
                  'destination_type': 'volume',
                  'snapshot_id': 'fake-snapshot-id-1',
                  'boot_index': -1}),
                 fake_block_device.FakeDbBlockDeviceDict(
                 {'id': 5,
                  'instance_uuid': uuids.block_device_instance,
                  'device_name': '/dev/vde',
                  'source_type': 'blank',
                  'destination_type': 'volume',
                  'boot_index': -1})])
        self.instance = {'uuid': uuids.instance,
                         'ephemeral_gb': 2}
        self.is_libvirt = False
        self.root_device_name = '/dev/vda'
        self.update_called = False

        self.patchers = []
        self.patchers.append(
                mock.patch.object(objects.BlockDeviceMapping, 'save'))
        for patcher in self.patchers:
            patcher.start()

    def tearDown(self):
        super(DefaultDeviceNamesForInstanceTestCase, self).tearDown()
        for patcher in self.patchers:
            patcher.stop()

    def _test_default_device_names(self, *block_device_lists):
        compute_utils.default_device_names_for_instance(self.instance,
                                                        self.root_device_name,
                                                        *block_device_lists)

    def test_only_block_device_mapping(self):
        # Test no-op
        original_bdm = copy.deepcopy(self.block_device_mapping)
        self._test_default_device_names([], [], self.block_device_mapping)
        for original, new in zip(original_bdm, self.block_device_mapping):
            self.assertEqual(original.device_name, new.device_name)

        # Assert it defaults the missing one as expected
        self.block_device_mapping[1]['device_name'] = None
        self.block_device_mapping[2]['device_name'] = None
        self._test_default_device_names([], [], self.block_device_mapping)
        self.assertEqual('/dev/vdb',
                         self.block_device_mapping[1]['device_name'])
        self.assertEqual('/dev/vdc',
                         self.block_device_mapping[2]['device_name'])

    def test_with_ephemerals(self):
        # Test ephemeral gets assigned
        self.ephemerals[0]['device_name'] = None
        self._test_default_device_names(self.ephemerals, [],
                                        self.block_device_mapping)
        self.assertEqual(self.ephemerals[0]['device_name'], '/dev/vdb')

        self.block_device_mapping[1]['device_name'] = None
        self.block_device_mapping[2]['device_name'] = None
        self._test_default_device_names(self.ephemerals, [],
                                        self.block_device_mapping)
        self.assertEqual('/dev/vdc',
                         self.block_device_mapping[1]['device_name'])
        self.assertEqual('/dev/vdd',
                         self.block_device_mapping[2]['device_name'])

    def test_with_swap(self):
        # Test swap only
        self.swap[0]['device_name'] = None
        self._test_default_device_names([], self.swap, [])
        self.assertEqual(self.swap[0]['device_name'], '/dev/vdb')

        # Test swap and block_device_mapping
        self.swap[0]['device_name'] = None
        self.block_device_mapping[1]['device_name'] = None
        self.block_device_mapping[2]['device_name'] = None
        self._test_default_device_names([], self.swap,
                                        self.block_device_mapping)
        self.assertEqual(self.swap[0]['device_name'], '/dev/vdb')
        self.assertEqual('/dev/vdc',
                         self.block_device_mapping[1]['device_name'])
        self.assertEqual('/dev/vdd',
                         self.block_device_mapping[2]['device_name'])

    def test_all_together(self):
        # Test swap missing
        self.swap[0]['device_name'] = None
        self._test_default_device_names(self.ephemerals,
                                        self.swap, self.block_device_mapping)
        self.assertEqual(self.swap[0]['device_name'], '/dev/vdc')

        # Test swap and eph missing
        self.swap[0]['device_name'] = None
        self.ephemerals[0]['device_name'] = None
        self._test_default_device_names(self.ephemerals,
                                        self.swap, self.block_device_mapping)
        self.assertEqual(self.ephemerals[0]['device_name'], '/dev/vdb')
        self.assertEqual(self.swap[0]['device_name'], '/dev/vdc')

        # Test all missing
        self.swap[0]['device_name'] = None
        self.ephemerals[0]['device_name'] = None
        self.block_device_mapping[1]['device_name'] = None
        self.block_device_mapping[2]['device_name'] = None
        self._test_default_device_names(self.ephemerals,
                                        self.swap, self.block_device_mapping)
        self.assertEqual(self.ephemerals[0]['device_name'], '/dev/vdb')
        self.assertEqual(self.swap[0]['device_name'], '/dev/vdc')
        self.assertEqual('/dev/vdd',
                         self.block_device_mapping[1]['device_name'])
        self.assertEqual('/dev/vde',
                         self.block_device_mapping[2]['device_name'])


class UsageInfoTestCase(test.TestCase):

    def setUp(self):
        def fake_get_nw_info(cls, ctxt, instance):
            self.assertTrue(ctxt.is_admin)
            return fake_network.fake_get_instance_nw_info(self, 1, 1)

        super(UsageInfoTestCase, self).setUp()
        self.stubs.Set(network_api.API, 'get_instance_nw_info',
                       fake_get_nw_info)

        fake_notifier.stub_notifier(self.stubs)
        self.addCleanup(fake_notifier.reset)

        self.flags(use_local=True, group='conductor')
        self.flags(compute_driver='nova.virt.fake.FakeDriver',
                   network_manager='nova.network.manager.FlatManager')
        self.compute = importutils.import_object(CONF.compute_manager)
        self.user_id = 'fake'
        self.project_id = 'fake'
        self.context = context.RequestContext(self.user_id, self.project_id)

        def fake_show(meh, context, id, **kwargs):
            return {'id': 1, 'properties': {'kernel_id': 1, 'ramdisk_id': 1}}

        self.stubs.Set(nova.tests.unit.image.fake._FakeImageService,
                       'show', fake_show)
        fake_network.set_stub_network_methods(self)
        fake_server_actions.stub_out_action_events(self.stubs)

    def test_notify_usage_exists(self):
        # Ensure 'exists' notification generates appropriate usage data.
        instance = create_instance(self.context)
        # Set some system metadata
        sys_metadata = {'image_md_key1': 'val1',
                        'image_md_key2': 'val2',
                        'other_data': 'meow'}
        instance.system_metadata.update(sys_metadata)
        instance.save()
        compute_utils.notify_usage_exists(
            rpc.get_notifier('compute'), self.context, instance)
        self.assertEqual(len(fake_notifier.NOTIFICATIONS), 1)
        msg = fake_notifier.NOTIFICATIONS[0]
        self.assertEqual(msg.priority, 'INFO')
        self.assertEqual(msg.event_type, 'compute.instance.exists')
        payload = msg.payload
        self.assertEqual(payload['tenant_id'], self.project_id)
        self.assertEqual(payload['user_id'], self.user_id)
        self.assertEqual(payload['instance_id'], instance['uuid'])
        self.assertEqual(payload['instance_type'], 'm1.tiny')
        type_id = flavors.get_flavor_by_name('m1.tiny')['id']
        self.assertEqual(str(payload['instance_type_id']), str(type_id))
        flavor_id = flavors.get_flavor_by_name('m1.tiny')['flavorid']
        self.assertEqual(str(payload['instance_flavor_id']), str(flavor_id))
        for attr in ('display_name', 'created_at', 'launched_at',
                     'state', 'state_description',
                     'bandwidth', 'audit_period_beginning',
                     'audit_period_ending', 'image_meta'):
            self.assertIn(attr, payload,
                          "Key %s not in payload" % attr)
        self.assertEqual(payload['image_meta'],
                {'md_key1': 'val1', 'md_key2': 'val2'})
        image_ref_url = "%s/images/1" % glance.generate_glance_url()
        self.assertEqual(payload['image_ref_url'], image_ref_url)
        self.compute.terminate_instance(self.context, instance, [], [])

    def test_notify_usage_exists_deleted_instance(self):
        # Ensure 'exists' notification generates appropriate usage data.
        instance = create_instance(self.context)
        # Set some system metadata
        sys_metadata = {'image_md_key1': 'val1',
                        'image_md_key2': 'val2',
                        'other_data': 'meow'}
        instance.system_metadata.update(sys_metadata)
        instance.save()
        self.compute.terminate_instance(self.context, instance, [], [])
        compute_utils.notify_usage_exists(
            rpc.get_notifier('compute'), self.context, instance)
        msg = fake_notifier.NOTIFICATIONS[-1]
        self.assertEqual(msg.priority, 'INFO')
        self.assertEqual(msg.event_type, 'compute.instance.exists')
        payload = msg.payload
        self.assertEqual(payload['tenant_id'], self.project_id)
        self.assertEqual(payload['user_id'], self.user_id)
        self.assertEqual(payload['instance_id'], instance['uuid'])
        self.assertEqual(payload['instance_type'], 'm1.tiny')
        type_id = flavors.get_flavor_by_name('m1.tiny')['id']
        self.assertEqual(str(payload['instance_type_id']), str(type_id))
        flavor_id = flavors.get_flavor_by_name('m1.tiny')['flavorid']
        self.assertEqual(str(payload['instance_flavor_id']), str(flavor_id))
        for attr in ('display_name', 'created_at', 'launched_at',
                     'state', 'state_description',
                     'bandwidth', 'audit_period_beginning',
                     'audit_period_ending', 'image_meta'):
            self.assertIn(attr, payload, "Key %s not in payload" % attr)
        self.assertEqual(payload['image_meta'],
                {'md_key1': 'val1', 'md_key2': 'val2'})
        image_ref_url = "%s/images/1" % glance.generate_glance_url()
        self.assertEqual(payload['image_ref_url'], image_ref_url)

    def test_notify_usage_exists_instance_not_found(self):
        # Ensure 'exists' notification generates appropriate usage data.
        instance = create_instance(self.context)
        self.compute.terminate_instance(self.context, instance, [], [])
        compute_utils.notify_usage_exists(
            rpc.get_notifier('compute'), self.context, instance)
        msg = fake_notifier.NOTIFICATIONS[-1]
        self.assertEqual(msg.priority, 'INFO')
        self.assertEqual(msg.event_type, 'compute.instance.exists')
        payload = msg.payload
        self.assertEqual(payload['tenant_id'], self.project_id)
        self.assertEqual(payload['user_id'], self.user_id)
        self.assertEqual(payload['instance_id'], instance['uuid'])
        self.assertEqual(payload['instance_type'], 'm1.tiny')
        type_id = flavors.get_flavor_by_name('m1.tiny')['id']
        self.assertEqual(str(payload['instance_type_id']), str(type_id))
        flavor_id = flavors.get_flavor_by_name('m1.tiny')['flavorid']
        self.assertEqual(str(payload['instance_flavor_id']), str(flavor_id))
        for attr in ('display_name', 'created_at', 'launched_at',
                     'state', 'state_description',
                     'bandwidth', 'audit_period_beginning',
                     'audit_period_ending', 'image_meta'):
            self.assertIn(attr, payload, "Key %s not in payload" % attr)
        self.assertEqual(payload['image_meta'], {})
        image_ref_url = "%s/images/1" % glance.generate_glance_url()
        self.assertEqual(payload['image_ref_url'], image_ref_url)

    def test_notify_about_instance_usage(self):
        instance = create_instance(self.context)
        # Set some system metadata
        sys_metadata = {'image_md_key1': 'val1',
                        'image_md_key2': 'val2',
                        'other_data': 'meow'}
        instance.system_metadata.update(sys_metadata)
        instance.save()
        extra_usage_info = {'image_name': 'fake_name'}
        compute_utils.notify_about_instance_usage(
            rpc.get_notifier('compute'),
            self.context, instance, 'create.start',
            extra_usage_info=extra_usage_info)
        self.assertEqual(len(fake_notifier.NOTIFICATIONS), 1)
        msg = fake_notifier.NOTIFICATIONS[0]
        self.assertEqual(msg.priority, 'INFO')
        self.assertEqual(msg.event_type, 'compute.instance.create.start')
        payload = msg.payload
        self.assertEqual(payload['tenant_id'], self.project_id)
        self.assertEqual(payload['user_id'], self.user_id)
        self.assertEqual(payload['instance_id'], instance['uuid'])
        self.assertEqual(payload['instance_type'], 'm1.tiny')
        type_id = flavors.get_flavor_by_name('m1.tiny')['id']
        self.assertEqual(str(payload['instance_type_id']), str(type_id))
        flavor_id = flavors.get_flavor_by_name('m1.tiny')['flavorid']
        self.assertEqual(str(payload['instance_flavor_id']), str(flavor_id))
        for attr in ('display_name', 'created_at', 'launched_at',
                     'state', 'state_description', 'image_meta'):
            self.assertIn(attr, payload, "Key %s not in payload" % attr)
        self.assertEqual(payload['image_meta'],
                {'md_key1': 'val1', 'md_key2': 'val2'})
        self.assertEqual(payload['image_name'], 'fake_name')
        image_ref_url = "%s/images/1" % glance.generate_glance_url()
        self.assertEqual(payload['image_ref_url'], image_ref_url)
        self.compute.terminate_instance(self.context, instance, [], [])

    def test_notify_about_aggregate_update_with_id(self):
        # Set aggregate payload
        aggregate_payload = {'aggregate_id': 1}
        compute_utils.notify_about_aggregate_update(self.context,
                                                    "create.end",
                                                    aggregate_payload)
        self.assertEqual(len(fake_notifier.NOTIFICATIONS), 1)
        msg = fake_notifier.NOTIFICATIONS[0]
        self.assertEqual(msg.priority, 'INFO')
        self.assertEqual(msg.event_type, 'aggregate.create.end')
        payload = msg.payload
        self.assertEqual(payload['aggregate_id'], 1)

    def test_notify_about_aggregate_update_with_name(self):
        # Set aggregate payload
        aggregate_payload = {'name': 'fakegroup'}
        compute_utils.notify_about_aggregate_update(self.context,
                                                    "create.start",
                                                    aggregate_payload)
        self.assertEqual(len(fake_notifier.NOTIFICATIONS), 1)
        msg = fake_notifier.NOTIFICATIONS[0]
        self.assertEqual(msg.priority, 'INFO')
        self.assertEqual(msg.event_type, 'aggregate.create.start')
        payload = msg.payload
        self.assertEqual(payload['name'], 'fakegroup')

    def test_notify_about_aggregate_update_without_name_id(self):
        # Set empty aggregate payload
        aggregate_payload = {}
        compute_utils.notify_about_aggregate_update(self.context,
                                                    "create.start",
                                                    aggregate_payload)
        self.assertEqual(len(fake_notifier.NOTIFICATIONS), 0)


class ComputeUtilsGetValFromSysMetadata(test.NoDBTestCase):

    def test_get_value_from_system_metadata(self):
        instance = fake_instance.fake_instance_obj('fake-context')
        system_meta = {'int_val': 1,
                       'int_string': '2',
                       'not_int': 'Nope'}
        instance.system_metadata = system_meta

        result = compute_utils.get_value_from_system_metadata(
                   instance, 'int_val', int, 0)
        self.assertEqual(1, result)

        result = compute_utils.get_value_from_system_metadata(
                   instance, 'int_string', int, 0)
        self.assertEqual(2, result)

        result = compute_utils.get_value_from_system_metadata(
                   instance, 'not_int', int, 0)
        self.assertEqual(0, result)


class ComputeUtilsGetNWInfo(test.NoDBTestCase):
    def test_instance_object_none_info_cache(self):
        inst = fake_instance.fake_instance_obj('fake-context',
                                               expected_attrs=['info_cache'])
        self.assertIsNone(inst.info_cache)
        result = compute_utils.get_nw_info_for_instance(inst)
        self.assertEqual(jsonutils.dumps([]), result.json())


class ComputeUtilsGetRebootTypes(test.NoDBTestCase):
    def setUp(self):
        super(ComputeUtilsGetRebootTypes, self).setUp()
        self.context = context.RequestContext('fake', 'fake')

    def test_get_reboot_type_started_soft(self):
        reboot_type = compute_utils.get_reboot_type(task_states.REBOOT_STARTED,
                                                    power_state.RUNNING)
        self.assertEqual(reboot_type, 'SOFT')

    def test_get_reboot_type_pending_soft(self):
        reboot_type = compute_utils.get_reboot_type(task_states.REBOOT_PENDING,
                                                    power_state.RUNNING)
        self.assertEqual(reboot_type, 'SOFT')

    def test_get_reboot_type_hard(self):
        reboot_type = compute_utils.get_reboot_type('foo', power_state.RUNNING)
        self.assertEqual(reboot_type, 'HARD')

    def test_get_reboot_not_running_hard(self):
        reboot_type = compute_utils.get_reboot_type('foo', 'bar')
        self.assertEqual(reboot_type, 'HARD')


class ComputeUtilsTestCase(test.NoDBTestCase):
    @mock.patch('netifaces.interfaces')
    def test_get_machine_ips_value_error(self, mock_interfaces):
        # Tests that the utility method does not explode if netifaces raises
        # a ValueError.
        iface = mock.sentinel
        mock_interfaces.return_value = [iface]
        with mock.patch('netifaces.ifaddresses',
                        side_effect=ValueError) as mock_ifaddresses:
            addresses = compute_utils.get_machine_ips()
            self.assertEqual([], addresses)
        mock_ifaddresses.assert_called_once_with(iface)


class ComputeUtilsQuotaDeltaTestCase(test.TestCase):
    def setUp(self):
        super(ComputeUtilsQuotaDeltaTestCase, self).setUp()
        self.context = context.RequestContext('fake', 'fake')

    def test_upsize_quota_delta(self):
        old_flavor = flavors.get_flavor_by_name('m1.tiny')
        new_flavor = flavors.get_flavor_by_name('m1.medium')

        expected_deltas = {
            'cores': new_flavor['vcpus'] - old_flavor['vcpus'],
            'ram': new_flavor['memory_mb'] - old_flavor['memory_mb']
        }

        deltas = compute_utils.upsize_quota_delta(self.context, new_flavor,
                                                  old_flavor)
        self.assertEqual(expected_deltas, deltas)

    def test_downsize_quota_delta(self):
        inst = create_instance(self.context, params=None)
        inst.old_flavor = flavors.get_flavor_by_name('m1.medium')
        inst.new_flavor = flavors.get_flavor_by_name('m1.tiny')

        expected_deltas = {
            'cores': (inst.new_flavor['vcpus'] -
                      inst.old_flavor['vcpus']),
            'ram': (inst.new_flavor['memory_mb'] -
                    inst.old_flavor['memory_mb'])
        }

        deltas = compute_utils.downsize_quota_delta(self.context, inst)
        self.assertEqual(expected_deltas, deltas)

    def test_reverse_quota_delta(self):
        inst = create_instance(self.context, params=None)
        inst.old_flavor = flavors.get_flavor_by_name('m1.tiny')
        inst.new_flavor = flavors.get_flavor_by_name('m1.medium')

        expected_deltas = {
            'cores': -1 * (inst.new_flavor['vcpus'] -
                           inst.old_flavor['vcpus']),
            'ram': -1 * (inst.new_flavor['memory_mb'] -
                         inst.old_flavor['memory_mb'])
        }

        deltas = compute_utils.reverse_upsize_quota_delta(self.context, inst)
        self.assertEqual(expected_deltas, deltas)

    @mock.patch.object(objects.Quotas, 'reserve')
    @mock.patch.object(objects.quotas, 'ids_from_instance')
    def test_reserve_quota_delta(self, mock_ids_from_instance,
                                 mock_reserve):
        quotas = objects.Quotas(context=context)
        inst = create_instance(self.context, params=None)
        inst.old_flavor = flavors.get_flavor_by_name('m1.tiny')
        inst.new_flavor = flavors.get_flavor_by_name('m1.medium')

        mock_ids_from_instance.return_value = (inst.project_id, inst.user_id)
        mock_reserve.return_value = quotas

        deltas = compute_utils.upsize_quota_delta(self.context,
                                                  inst.new_flavor,
                                                  inst.old_flavor)
        compute_utils.reserve_quota_delta(self.context, deltas, inst)
        mock_reserve.assert_called_once_with(project_id=inst.project_id,
                                             user_id=inst.user_id, **deltas)
