# Copyright 2012 Red Hat, Inc.
# All Rights Reserved.
#
#    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 network API."""

import contextlib
import itertools
import uuid

import mock
from mox3 import mox

from nova.compute import flavors
from nova import context
from nova import exception
from nova import network
from nova.network import api
from nova.network import base_api
from nova.network import floating_ips
from nova.network import model as network_model
from nova.network import rpcapi as network_rpcapi
from nova import objects
from nova.objects import fields
from nova.openstack.common import policy as common_policy
from nova import policy
from nova import test
from nova.tests.unit import fake_instance
from nova.tests.unit.objects import test_fixed_ip
from nova.tests.unit.objects import test_virtual_interface

FAKE_UUID = 'a47ae74e-ab08-547f-9eee-ffd23fc46c16'

fake_info_cache = {
    'created_at': None,
    'updated_at': None,
    'deleted_at': None,
    'deleted': False,
    'instance_uuid': 'fake-uuid',
    'network_info': '[]',
    }


class NetworkPolicyTestCase(test.TestCase):
    def setUp(self):
        super(NetworkPolicyTestCase, self).setUp()

        policy.reset()
        policy.init()

        self.context = context.get_admin_context()

    def tearDown(self):
        super(NetworkPolicyTestCase, self).tearDown()
        policy.reset()

    def test_check_policy(self):
        self.mox.StubOutWithMock(policy, 'enforce')
        target = {
            'project_id': self.context.project_id,
            'user_id': self.context.user_id,
        }
        policy.enforce(self.context, 'network:get_all', target)
        self.mox.ReplayAll()
        api.check_policy(self.context, 'get_all')

    def test_skip_policy(self):
        policy.reset()
        rules = {'network:get_all': common_policy.parse_rule('!')}
        policy.set_rules(common_policy.Rules(rules))
        api = network.API()
        self.assertRaises(exception.PolicyNotAuthorized,
                          api.get_all, self.context)
        api = network.API(skip_policy_check=True)
        api.get_all(self.context)


class ApiTestCase(test.TestCase):
    def setUp(self):
        super(ApiTestCase, self).setUp()
        self.network_api = network.API()
        self.context = context.RequestContext('fake-user',
                                              'fake-project')

    @mock.patch('nova.objects.NetworkList.get_all')
    def test_get_all(self, mock_get_all):
        mock_get_all.return_value = mock.sentinel.get_all
        self.assertEqual(mock.sentinel.get_all,
                         self.network_api.get_all(self.context))
        mock_get_all.assert_called_once_with(self.context,
                                             project_only=True)

    @mock.patch('nova.objects.NetworkList.get_all')
    def test_get_all_liberal(self, mock_get_all):
        self.flags(network_manager='nova.network.manager.FlatDHCPManaager')
        mock_get_all.return_value = mock.sentinel.get_all
        self.assertEqual(mock.sentinel.get_all,
                         self.network_api.get_all(self.context))
        mock_get_all.assert_called_once_with(self.context,
                                             project_only="allow_none")

    @mock.patch('nova.objects.NetworkList.get_all')
    def test_get_all_no_networks(self, mock_get_all):
        mock_get_all.side_effect = exception.NoNetworksFound
        self.assertEqual([], self.network_api.get_all(self.context))
        mock_get_all.assert_called_once_with(self.context,
                                             project_only=True)

    @mock.patch('nova.objects.Network.get_by_uuid')
    def test_get(self, mock_get):
        mock_get.return_value = mock.sentinel.get_by_uuid
        self.assertEqual(mock.sentinel.get_by_uuid,
                         self.network_api.get(self.context, 'fake-uuid'))

    @mock.patch('nova.objects.Network.get_by_id')
    @mock.patch('nova.db.virtual_interface_get_by_instance')
    def test_get_vifs_by_instance(self, mock_get_by_instance,
                                  mock_get_by_id):
        mock_get_by_instance.return_value = [
            dict(test_virtual_interface.fake_vif,
                 network_id=123)]
        mock_get_by_id.return_value = objects.Network()
        mock_get_by_id.return_value.uuid = mock.sentinel.network_uuid
        instance = objects.Instance(uuid=mock.sentinel.inst_uuid)
        vifs = self.network_api.get_vifs_by_instance(self.context,
                                                     instance)
        self.assertEqual(1, len(vifs))
        self.assertEqual(123, vifs[0].network_id)
        self.assertEqual(str(mock.sentinel.network_uuid), vifs[0].net_uuid)
        mock_get_by_instance.assert_called_once_with(
            self.context, str(mock.sentinel.inst_uuid), use_slave=False)
        mock_get_by_id.assert_called_once_with(self.context, 123,
                                               project_only='allow_none')

    @mock.patch('nova.objects.Network.get_by_id')
    @mock.patch('nova.db.virtual_interface_get_by_address')
    def test_get_vif_by_mac_address(self, mock_get_by_address,
                                    mock_get_by_id):
        mock_get_by_address.return_value = dict(
            test_virtual_interface.fake_vif, network_id=123)
        mock_get_by_id.return_value = objects.Network(
            uuid=mock.sentinel.network_uuid)
        vif = self.network_api.get_vif_by_mac_address(self.context,
                                                      mock.sentinel.mac)
        self.assertEqual(123, vif.network_id)
        self.assertEqual(str(mock.sentinel.network_uuid), vif.net_uuid)
        mock_get_by_address.assert_called_once_with(self.context,
                                                    mock.sentinel.mac)
        mock_get_by_id.assert_called_once_with(self.context, 123,
                                               project_only='allow_none')

    def test_allocate_for_instance_handles_macs_passed(self):
        # If a macs argument is supplied to the 'nova-network' API, it is just
        # ignored. This test checks that the call down to the rpcapi layer
        # doesn't pass macs down: nova-network doesn't support hypervisor
        # mac address limits (today anyhow).
        macs = set(['ab:cd:ef:01:23:34'])
        self.mox.StubOutWithMock(
            self.network_api.network_rpcapi, "allocate_for_instance")
        kwargs = dict(zip(['host', 'instance_id', 'project_id',
                'requested_networks', 'rxtx_factor', 'vpn', 'macs',
                'dhcp_options'],
                itertools.repeat(mox.IgnoreArg())))
        self.network_api.network_rpcapi.allocate_for_instance(
            mox.IgnoreArg(), **kwargs).AndReturn([])
        self.mox.ReplayAll()
        flavor = flavors.get_default_flavor()
        flavor['rxtx_factor'] = 0
        instance = objects.Instance(id=1, uuid='uuid', project_id='project_id',
                                    host='host', system_metadata={},
                                    flavor=flavor)
        self.network_api.allocate_for_instance(
            self.context, instance, 'vpn', 'requested_networks', macs=macs)

    def _do_test_associate_floating_ip(self, orig_instance_uuid):
        """Test post-association logic."""

        new_instance = objects.Instance(uuid=FAKE_UUID)

        def fake_associate(*args, **kwargs):
            return orig_instance_uuid

        self.stubs.Set(floating_ips.FloatingIP, 'associate_floating_ip',
                       fake_associate)

        def fake_instance_get_by_uuid(context, instance_uuid,
                                      columns_to_join=None,
                                      use_slave=None):
            return fake_instance.fake_db_instance(uuid=instance_uuid)

        self.stubs.Set(self.network_api.db, 'instance_get_by_uuid',
                       fake_instance_get_by_uuid)

        def fake_get_nw_info(ctxt, instance):
            class FakeNWInfo(object):
                def json(self):
                    pass
            return FakeNWInfo()

        self.stubs.Set(self.network_api, '_get_instance_nw_info',
                       fake_get_nw_info)

        if orig_instance_uuid:
            expected_updated_instances = [new_instance.uuid,
                                          orig_instance_uuid]
        else:
            expected_updated_instances = [new_instance.uuid]

        def fake_instance_info_cache_update(context, instance_uuid, cache):
            self.assertEqual(instance_uuid,
                             expected_updated_instances.pop())
            return fake_info_cache

        self.stubs.Set(self.network_api.db, 'instance_info_cache_update',
                       fake_instance_info_cache_update)

        def fake_update_instance_cache_with_nw_info(api, context, instance,
                                                    nw_info=None,
                                                    update_cells=True):
            return

        self.stubs.Set(base_api, "update_instance_cache_with_nw_info",
                       fake_update_instance_cache_with_nw_info)

        self.network_api.associate_floating_ip(self.context,
                                               new_instance,
                                               '172.24.4.225',
                                               '10.0.0.2')

    def test_associate_preassociated_floating_ip(self):
        self._do_test_associate_floating_ip('orig-uuid')

    def test_associate_unassociated_floating_ip(self):
        self._do_test_associate_floating_ip(None)

    def test_get_floating_ip_invalid_id(self):
        self.assertRaises(exception.InvalidID,
                          self.network_api.get_floating_ip,
                          self.context, '123zzz')

    @mock.patch('nova.objects.FloatingIP.get_by_id')
    def test_get_floating_ip(self, mock_get):
        floating = mock.sentinel.floating
        mock_get.return_value = floating
        self.assertEqual(floating,
                         self.network_api.get_floating_ip(self.context, 123))
        mock_get.assert_called_once_with(self.context, 123)

    @mock.patch('nova.objects.FloatingIP.get_pool_names')
    def test_get_floating_ip_pools(self, mock_get):
        pools = ['foo', 'bar']
        mock_get.return_value = pools
        self.assertEqual(pools,
                         self.network_api.get_floating_ip_pools(
                             self.context))

    @mock.patch('nova.objects.FloatingIP.get_by_address')
    def test_get_floating_ip_by_address(self, mock_get):
        floating = mock.sentinel.floating
        mock_get.return_value = floating
        self.assertEqual(floating,
                         self.network_api.get_floating_ip_by_address(
                             self.context, mock.sentinel.address))
        mock_get.assert_called_once_with(self.context,
                                         mock.sentinel.address)

    @mock.patch('nova.objects.FloatingIPList.get_by_project')
    def test_get_floating_ips_by_project(self, mock_get):
        floatings = mock.sentinel.floating_ips
        mock_get.return_value = floatings
        self.assertEqual(floatings,
                         self.network_api.get_floating_ips_by_project(
                             self.context))
        mock_get.assert_called_once_with(self.context,
                                         self.context.project_id)

    def _stub_migrate_instance_calls(self, method, multi_host, info):
        fake_flavor = flavors.get_default_flavor()
        fake_flavor['rxtx_factor'] = 1.21
        fake_instance = objects.Instance(
            uuid=uuid.uuid4().hex,
            project_id='fake_project_id',
            instance_type_id=fake_flavor['id'],
            flavor=fake_flavor,
            system_metadata={})
        fake_migration = {'source_compute': 'fake_compute_source',
                          'dest_compute': 'fake_compute_dest'}

        def fake_mig_inst_method(*args, **kwargs):
            info['kwargs'] = kwargs

        def fake_get_multi_addresses(*args, **kwargs):
            return multi_host, ['fake_float1', 'fake_float2']

        self.stubs.Set(network_rpcapi.NetworkAPI, method,
                fake_mig_inst_method)
        self.stubs.Set(self.network_api, '_get_multi_addresses',
                fake_get_multi_addresses)

        expected = {'instance_uuid': fake_instance.uuid,
                    'source_compute': 'fake_compute_source',
                    'dest_compute': 'fake_compute_dest',
                    'rxtx_factor': 1.21,
                    'project_id': 'fake_project_id',
                    'floating_addresses': None}
        if multi_host:
            expected['floating_addresses'] = ['fake_float1', 'fake_float2']
        return fake_instance, fake_migration, expected

    def test_migrate_instance_start_with_multhost(self):
        info = {'kwargs': {}}
        arg1, arg2, expected = self._stub_migrate_instance_calls(
                'migrate_instance_start', True, info)
        expected['host'] = 'fake_compute_source'
        self.network_api.migrate_instance_start(self.context, arg1, arg2)
        self.assertEqual(info['kwargs'], expected)

    def test_migrate_instance_start_without_multhost(self):
        info = {'kwargs': {}}
        arg1, arg2, expected = self._stub_migrate_instance_calls(
                'migrate_instance_start', False, info)
        self.network_api.migrate_instance_start(self.context, arg1, arg2)
        self.assertEqual(info['kwargs'], expected)

    def test_migrate_instance_finish_with_multhost(self):
        info = {'kwargs': {}}
        arg1, arg2, expected = self._stub_migrate_instance_calls(
                'migrate_instance_finish', True, info)
        expected['host'] = 'fake_compute_dest'
        self.network_api.migrate_instance_finish(self.context, arg1, arg2)
        self.assertEqual(info['kwargs'], expected)

    def test_migrate_instance_finish_without_multhost(self):
        info = {'kwargs': {}}
        arg1, arg2, expected = self._stub_migrate_instance_calls(
                'migrate_instance_finish', False, info)
        self.network_api.migrate_instance_finish(self.context, arg1, arg2)
        self.assertEqual(info['kwargs'], expected)

    def test_is_multi_host_instance_has_no_fixed_ip(self):
        def fake_fixed_ip_get_by_instance(ctxt, uuid):
            raise exception.FixedIpNotFoundForInstance(instance_uuid=uuid)
        self.stubs.Set(self.network_api.db, 'fixed_ip_get_by_instance',
                       fake_fixed_ip_get_by_instance)
        instance = objects.Instance(uuid=FAKE_UUID)
        result, floats = self.network_api._get_multi_addresses(self.context,
                                                               instance)
        self.assertFalse(result)

    @mock.patch('nova.objects.fixed_ip.FixedIPList.get_by_instance_uuid')
    def _test_is_multi_host_network_has_no_project_id(self, is_multi_host,
                                                      fip_get):
        network = objects.Network(
            id=123, project_id=None,
            multi_host=is_multi_host)
        fip_get.return_value = [
            objects.FixedIP(instance_uuid=FAKE_UUID, network=network,
                            floating_ips=objects.FloatingIPList())]
        instance = objects.Instance(uuid=FAKE_UUID)
        result, floats = self.network_api._get_multi_addresses(self.context,
                                                               instance)
        self.assertEqual(is_multi_host, result)

    def test_is_multi_host_network_has_no_project_id_multi(self):
        self._test_is_multi_host_network_has_no_project_id(True)

    def test_is_multi_host_network_has_no_project_id_non_multi(self):
        self._test_is_multi_host_network_has_no_project_id(False)

    @mock.patch('nova.objects.fixed_ip.FixedIPList.get_by_instance_uuid')
    def _test_is_multi_host_network_has_project_id(self, is_multi_host,
                                                   fip_get):
        network = objects.Network(
            id=123, project_id=self.context.project_id,
            multi_host=is_multi_host)
        fip_get.return_value = [
            objects.FixedIP(instance_uuid=FAKE_UUID, network=network,
                            floating_ips=objects.FloatingIPList())]
        instance = objects.Instance(uuid=FAKE_UUID)
        result, floats = self.network_api._get_multi_addresses(self.context,
                                                               instance)
        self.assertEqual(is_multi_host, result)

    def test_is_multi_host_network_has_project_id_multi(self):
        self._test_is_multi_host_network_has_project_id(True)

    def test_is_multi_host_network_has_project_id_non_multi(self):
        self._test_is_multi_host_network_has_project_id(False)

    @mock.patch('nova.objects.Network.get_by_uuid')
    @mock.patch('nova.objects.Network.disassociate')
    def test_network_disassociate_project(self, mock_disassociate, mock_get):
        net_obj = objects.Network(context=self.context, id=1)
        mock_get.return_value = net_obj
        self.network_api.associate(self.context, FAKE_UUID, project=None)
        mock_disassociate.assert_called_once_with(self.context, net_obj.id,
                                                  host=False, project=True)

    @mock.patch('nova.objects.Network.get_by_uuid')
    @mock.patch('nova.objects.Network.disassociate')
    def test_network_disassociate_host(self, mock_disassociate, mock_get):
        net_obj = objects.Network(context=self.context, id=1)
        mock_get.return_value = net_obj
        self.network_api.associate(self.context, FAKE_UUID, host=None)
        mock_disassociate.assert_called_once_with(self.context, net_obj.id,
                                                  host=True, project=False)

    @mock.patch('nova.objects.Network.get_by_uuid')
    @mock.patch('nova.objects.Network.associate')
    def test_network_associate_project(self, mock_associate, mock_get):
        net_obj = objects.Network(context=self.context, id=1)
        mock_get.return_value = net_obj
        project = mock.sentinel.project
        self.network_api.associate(self.context, FAKE_UUID, project=project)
        mock_associate.assert_called_once_with(self.context, project,
                                               network_id=net_obj.id,
                                               force=True)

    @mock.patch('nova.objects.Network.get_by_uuid')
    @mock.patch('nova.objects.Network.save')
    def test_network_associate_host(self, mock_save, mock_get):
        net_obj = objects.Network(context=self.context, id=1)
        mock_get.return_value = net_obj
        host = str(mock.sentinel.host)
        self.network_api.associate(self.context, FAKE_UUID, host=host)
        mock_save.assert_called_once_with()
        self.assertEqual(host, net_obj.host)

    @mock.patch('nova.objects.Network.get_by_uuid')
    @mock.patch('nova.objects.Network.disassociate')
    def test_network_disassociate(self, mock_disassociate, mock_get):
        mock_get.return_value = objects.Network(context=self.context, id=123)
        self.network_api.disassociate(self.context, FAKE_UUID)
        mock_disassociate.assert_called_once_with(self.context, 123,
                                                  project=True, host=True)

    def _test_refresh_cache(self, method, *args, **kwargs):
        # This test verifies that no call to get_instance_nw_info() is made
        # from the @refresh_cache decorator for the tested method.
        with contextlib.nested(
            mock.patch.object(self.network_api.network_rpcapi, method),
            mock.patch.object(self.network_api.network_rpcapi,
                              'get_instance_nw_info'),
            mock.patch.object(network_model.NetworkInfo, 'hydrate'),
            mock.patch.object(objects.InstanceInfoCache, 'save'),
        ) as (
            method_mock, nwinfo_mock, hydrate_mock, save_mock
        ):
            nw_info = network_model.NetworkInfo([])
            method_mock.return_value = nw_info
            hydrate_mock.return_value = nw_info
            getattr(self.network_api, method)(*args, **kwargs)
            hydrate_mock.assert_called_once_with(nw_info)
            self.assertFalse(nwinfo_mock.called)

    def test_allocate_for_instance_refresh_cache(self):
        instance = fake_instance.fake_instance_obj(self.context)
        vpn = 'fake-vpn'
        requested_networks = 'fake-networks'
        self._test_refresh_cache('allocate_for_instance', self.context,
                                 instance, vpn, requested_networks)

    def test_add_fixed_ip_to_instance_refresh_cache(self):
        instance = fake_instance.fake_instance_obj(self.context)
        network_id = 'fake-network-id'
        self._test_refresh_cache('add_fixed_ip_to_instance', self.context,
                                 instance, network_id)

    def test_remove_fixed_ip_from_instance_refresh_cache(self):
        instance = fake_instance.fake_instance_obj(self.context)
        address = 'fake-address'
        self._test_refresh_cache('remove_fixed_ip_from_instance', self.context,
                                 instance, address)

    @mock.patch('nova.db.fixed_ip_get_by_address')
    def test_get_fixed_ip_by_address(self, fip_get):
        fip_get.return_value = test_fixed_ip.fake_fixed_ip
        fip = self.network_api.get_fixed_ip_by_address(self.context,
                                                       'fake-addr')
        self.assertIsInstance(fip, objects.FixedIP)

    @mock.patch('nova.objects.FixedIP.get_by_id')
    def test_get_fixed_ip(self, mock_get_by_id):
        mock_get_by_id.return_value = mock.sentinel.fixed_ip
        self.assertEqual(mock.sentinel.fixed_ip,
                         self.network_api.get_fixed_ip(self.context,
                                                       mock.sentinel.id))
        mock_get_by_id.assert_called_once_with(self.context, mock.sentinel.id)

    @mock.patch('nova.objects.FixedIP.get_by_floating_address')
    def test_get_instance_by_floating_address(self, mock_get_by_floating):
        mock_get_by_floating.return_value = objects.FixedIP(
            instance_uuid = mock.sentinel.instance_uuid)
        self.assertEqual(str(mock.sentinel.instance_uuid),
                         self.network_api.get_instance_id_by_floating_address(
                             self.context, mock.sentinel.floating))
        mock_get_by_floating.assert_called_once_with(self.context,
                                                     mock.sentinel.floating)

    @mock.patch('nova.objects.FixedIP.get_by_floating_address')
    def test_get_instance_by_floating_address_none(self, mock_get_by_floating):
        mock_get_by_floating.return_value = None
        self.assertIsNone(
            self.network_api.get_instance_id_by_floating_address(
                self.context, mock.sentinel.floating))
        mock_get_by_floating.assert_called_once_with(self.context,
                                                     mock.sentinel.floating)

    @mock.patch('nova.network.api.API.migrate_instance_start')
    def test_cleanup_instance_network_on_host(self, fake_migrate_start):
        instance = fake_instance.fake_instance_obj(self.context)
        self.network_api.cleanup_instance_network_on_host(
            self.context, instance, 'fake_compute_source')
        fake_migrate_start.assert_called_once_with(
            self.context, instance,
            {'source_compute': 'fake_compute_source', 'dest_compute': None})

    @mock.patch('nova.network.api.API.migrate_instance_finish')
    def test_setup_instance_network_on_host(self, fake_migrate_finish):
        instance = fake_instance.fake_instance_obj(self.context)
        self.network_api.setup_instance_network_on_host(
            self.context, instance, 'fake_compute_source')
        fake_migrate_finish.assert_called_once_with(
            self.context, instance,
            {'source_compute': None, 'dest_compute': 'fake_compute_source'})

    @mock.patch('oslo_concurrency.lockutils.lock')
    @mock.patch.object(api.API, '_get_instance_nw_info')
    @mock.patch('nova.network.base_api.update_instance_cache_with_nw_info')
    def test_get_instance_nw_info(self, mock_update, mock_get, mock_lock):
        fake_result = mock.sentinel.get_nw_info_result
        mock_get.return_value = fake_result
        instance = fake_instance.fake_instance_obj(self.context)
        result = self.network_api.get_instance_nw_info(self.context, instance)
        mock_get.assert_called_once_with(self.context, instance)
        mock_update.assert_called_once_with(self.network_api, self.context,
                                            instance, nw_info=fake_result,
                                            update_cells=False)
        self.assertEqual(fake_result, result)


@mock.patch('nova.network.api.API')
@mock.patch('nova.db.instance_info_cache_update', return_value=fake_info_cache)
class TestUpdateInstanceCache(test.NoDBTestCase):
    def setUp(self):
        super(TestUpdateInstanceCache, self).setUp()
        self.context = context.get_admin_context()
        self.instance = objects.Instance(uuid=FAKE_UUID)
        vifs = [network_model.VIF(id='super_vif')]
        self.nw_info = network_model.NetworkInfo(vifs)
        self.nw_json = fields.NetworkModel.to_primitive(self, 'network_info',
                                                        self.nw_info)

    def test_update_nw_info_none(self, db_mock, api_mock):
        api_mock._get_instance_nw_info.return_value = self.nw_info

        base_api.update_instance_cache_with_nw_info(api_mock, self.context,
                                               self.instance, None)
        api_mock._get_instance_nw_info.assert_called_once_with(self.context,
                                                                self.instance)
        db_mock.assert_called_once_with(self.context, self.instance.uuid,
                                        {'network_info': self.nw_json})

    def test_update_nw_info_one_network(self, db_mock, api_mock):
        api_mock._get_instance_nw_info.return_value = self.nw_info
        base_api.update_instance_cache_with_nw_info(api_mock, self.context,
                                               self.instance, self.nw_info)
        self.assertFalse(api_mock._get_instance_nw_info.called)
        db_mock.assert_called_once_with(self.context, self.instance.uuid,
                                        {'network_info': self.nw_json})

    def test_update_nw_info_empty_list(self, db_mock, api_mock):
        api_mock._get_instance_nw_info.return_value = self.nw_info
        base_api.update_instance_cache_with_nw_info(api_mock, self.context,
                                                self.instance,
                                                network_model.NetworkInfo([]))
        self.assertFalse(api_mock._get_instance_nw_info.called)
        db_mock.assert_called_once_with(self.context, self.instance.uuid,
                                        {'network_info': '[]'})

    def test_decorator_return_object(self, db_mock, api_mock):
        @base_api.refresh_cache
        def func(self, context, instance):
            return network_model.NetworkInfo([])
        func(api_mock, self.context, self.instance)
        self.assertFalse(api_mock._get_instance_nw_info.called)
        db_mock.assert_called_once_with(self.context, self.instance.uuid,
                                        {'network_info': '[]'})

    def test_decorator_return_none(self, db_mock, api_mock):
        @base_api.refresh_cache
        def func(self, context, instance):
            pass
        api_mock._get_instance_nw_info.return_value = self.nw_info
        func(api_mock, self.context, self.instance)
        api_mock._get_instance_nw_info.assert_called_once_with(self.context,
                                                                self.instance)
        db_mock.assert_called_once_with(self.context, self.instance.uuid,
                                        {'network_info': self.nw_json})


class NetworkHooksTestCase(test.BaseHookTestCase):
    def test_instance_network_info_hook(self):
        info_func = base_api.update_instance_cache_with_nw_info
        self.assert_has_hook('instance_network_info', info_func)
