# Copyright 2013 OpenStack Foundation
# 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.

import mock
from oslo_config import cfg
from oslo_serialization import jsonutils
from six.moves import range
from webob import exc

from nova.api.openstack.compute import block_device_mapping
from nova.api.openstack.compute import servers as servers_v21
from nova import block_device
from nova.compute import api as compute_api
from nova import exception
from nova import test
from nova.tests.unit.api.openstack import fakes
from nova.tests.unit.image import fake
from nova.tests.unit import matchers

CONF = cfg.CONF


class BlockDeviceMappingTestV21(test.TestCase):
    validation_error = exception.ValidationError

    def _setup_controller(self):
        self.controller = servers_v21.ServersController()

    def setUp(self):
        super(BlockDeviceMappingTestV21, self).setUp()
        fakes.stub_out_nw_api(self)
        self._setup_controller()
        fake.stub_out_image_service(self)

        self.bdm = [{
            'no_device': None,
            'source_type': 'volume',
            'destination_type': 'volume',
            'uuid': 'fake',
            'device_name': 'vdb',
            'delete_on_termination': False,
        }]

    def _get_servers_body(self, no_image=False):
        body = {
            'server': {
                'name': 'server_test',
                'imageRef': '76fa36fc-c930-4bf3-8c8a-ea2a2420deb6',
                'flavorRef': 'http://localhost/123/flavors/3',
                'metadata': {
                    'hello': 'world',
                    'open': 'stack',
                },
            },
        }
        if no_image:
            del body['server']['imageRef']
        return body

    def _test_create(self, params, no_image=False):
        body = self._get_servers_body(no_image)
        body['server'].update(params)

        req = fakes.HTTPRequest.blank('/v2/fake/servers')
        req.method = 'POST'
        req.headers['content-type'] = 'application/json'

        req.body = jsonutils.dump_as_bytes(body)
        self.controller.create(req, body=body).obj['server']

    def test_create_instance_with_volumes_enabled_no_image(self):
        """Test that the create will fail if there is no image
        and no bdms supplied in the request
        """
        old_create = compute_api.API.create

        def create(*args, **kwargs):
            self.assertNotIn('imageRef', kwargs)
            return old_create(*args, **kwargs)

        self.stub_out('nova.compute.api.API.create', create)

        self.assertRaises(exc.HTTPBadRequest,
                          self._test_create, {}, no_image=True)

    @mock.patch.object(compute_api.API, '_validate_bdm')
    @mock.patch.object(compute_api.API, '_get_bdm_image_metadata')
    def test_create_instance_with_bdms_and_no_image(
            self, mock_bdm_image_metadata, mock_validate_bdm):
        mock_bdm_image_metadata.return_value = {}
        mock_validate_bdm.return_value = True
        old_create = compute_api.API.create

        def create(*args, **kwargs):
            self.assertThat(
                block_device.BlockDeviceDict(self.bdm[0]),
                matchers.DictMatches(kwargs['block_device_mapping'][0])
            )
            return old_create(*args, **kwargs)

        self.stub_out('nova.compute.api.API.create', create)

        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm}
        self._test_create(params, no_image=True)

        mock_validate_bdm.assert_called_once_with(
            mock.ANY, mock.ANY, mock.ANY, mock.ANY)
        mock_bdm_image_metadata.assert_called_once_with(
            mock.ANY, mock.ANY, False)

    @mock.patch.object(compute_api.API, '_validate_bdm')
    @mock.patch.object(compute_api.API, '_get_bdm_image_metadata')
    def test_create_instance_with_bdms_and_empty_imageRef(
        self, mock_bdm_image_metadata, mock_validate_bdm):
        mock_bdm_image_metadata.return_value = {}
        mock_validate_bdm.return_value = True
        old_create = compute_api.API.create

        def create(*args, **kwargs):
            self.assertThat(
                block_device.BlockDeviceDict(self.bdm[0]),
                matchers.DictMatches(kwargs['block_device_mapping'][0])
            )
            return old_create(*args, **kwargs)

        self.stub_out('nova.compute.api.API.create', create)

        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm,
                  'imageRef': ''}
        self._test_create(params)

    def test_create_instance_with_imageRef_as_full_url(self):
        bdm = [{'device_name': 'foo'}]
        image_href = ('http://localhost/v2/fake/images/'
                     '76fa36fc-c930-4bf3-8c8a-ea2a2420deb6')
        params = {block_device_mapping.ATTRIBUTE_NAME: bdm,
                  'imageRef': image_href}
        self.assertRaises(exception.ValidationError,
                          self._test_create, params)

    def test_create_instance_with_non_uuid_imageRef(self):
        bdm = [{'device_name': 'foo'}]

        params = {block_device_mapping.ATTRIBUTE_NAME: bdm,
                  'imageRef': '123123abcd'}
        self.assertRaises(exception.ValidationError,
                          self._test_create, params)

    def test_create_instance_with_invalid_bdm_in_2nd_dict(self):
        bdm_1st = {"source_type": "image", "delete_on_termination": True,
                   "boot_index": 0,
                   "uuid": "2ff3a1d3-ed70-4c3f-94ac-941461153bc0",
                   "destination_type": "local"}
        bdm_2nd = {"source_type": "volume",
                   "uuid": "99d92140-3d0c-4ea5-a49c-f94c38c607f0",
                   "destination_type": "invalid"}
        bdm = [bdm_1st, bdm_2nd]

        params = {block_device_mapping.ATTRIBUTE_NAME: bdm,
                  'imageRef': '2ff3a1d3-ed70-4c3f-94ac-941461153bc0'}
        self.assertRaises(exception.ValidationError,
                          self._test_create, params)

    def test_create_instance_with_boot_index_none_ok(self):
        """Tests creating a server with two block devices. One is the boot
        device and the other is a non-bootable device.
        """
        # From the docs:
        # To disable a device from booting, set the boot index to a negative
        # value or use the default boot index value, which is None. The
        # simplest usage is, set the boot index of the boot device to 0 and use
        # the default boot index value, None, for any other devices.
        bdms = [
            # This is the bootable device that would create a 20GB cinder
            # volume from the given image.
            {
                'source_type': 'image',
                'destination_type': 'volume',
                'boot_index': 0,
                'uuid': '155d900f-4e14-4e4c-a73d-069cbf4541e6',
                'volume_size': 20
            },
            # This is the non-bootable 10GB ext4 ephemeral block device.
            {
                'source_type': 'blank',
                'destination_type': 'local',
                'boot_index': None,
                # If 'guest_format' is 'swap' then a swap device is created.
                'guest_format': 'ext4'
            }
        ]
        params = {block_device_mapping.ATTRIBUTE_NAME: bdms}
        self._test_create(params, no_image=True)

    def test_create_instance_with_boot_index_none_image_local_fails(self):
        """Tests creating a server with a local image-based block device which
        has a boot_index of None which is invalid.
        """
        bdms = [{
            'source_type': 'image',
            'destination_type': 'local',
            'boot_index': None,
            'uuid': '155d900f-4e14-4e4c-a73d-069cbf4541e6'
        }]
        params = {block_device_mapping.ATTRIBUTE_NAME: bdms}
        self.assertRaises(exc.HTTPBadRequest, self._test_create,
                          params, no_image=True)

    def test_create_instance_with_invalid_boot_index(self):
        bdm = [{"source_type": "image", "delete_on_termination": True,
                "boot_index": 'invalid',
                "uuid": "2ff3a1d3-ed70-4c3f-94ac-941461153bc0",
                "destination_type": "local"}]

        params = {block_device_mapping.ATTRIBUTE_NAME: bdm,
                  'imageRef': '2ff3a1d3-ed70-4c3f-94ac-941461153bc0'}
        self.assertRaises(exception.ValidationError,
                          self._test_create, params)

    def test_create_instance_with_device_name_not_string(self):
        self.bdm[0]['device_name'] = 123
        old_create = compute_api.API.create

        def create(*args, **kwargs):
            self.assertEqual(kwargs['block_device_mapping'], self.bdm)
            return old_create(*args, **kwargs)

        self.stub_out('nova.compute.api.API.create', create)

        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm}
        self.assertRaises(self.validation_error,
                          self._test_create, params, no_image=True)

    @mock.patch.object(compute_api.API, 'create')
    def test_create_instance_with_bdm_param_not_list(self, mock_create):
        self.params = {'block_device_mapping': '/dev/vdb'}
        self.assertRaises(self.validation_error,
                          self._test_create, self.params)

    def test_create_instance_with_device_name_empty(self):
        self.bdm[0]['device_name'] = ''

        old_create = compute_api.API.create

        def create(*args, **kwargs):
            self.assertEqual(kwargs['block_device_mapping'], self.bdm)
            return old_create(*args, **kwargs)

        self.stub_out('nova.compute.api.API.create', create)

        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm}
        self.assertRaises(self.validation_error,
                          self._test_create, params, no_image=True)

    def test_create_instance_with_device_name_too_long(self):
        self.bdm[0]['device_name'] = 'a' * 256

        old_create = compute_api.API.create

        def create(*args, **kwargs):
            self.assertEqual(kwargs['block_device_mapping'], self.bdm)
            return old_create(*args, **kwargs)

        self.stub_out('nova.compute.api.API.create', create)

        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm}
        self.assertRaises(self.validation_error,
                          self._test_create, params, no_image=True)

    def test_create_instance_with_space_in_device_name(self):
        self.bdm[0]['device_name'] = 'v da'

        old_create = compute_api.API.create

        def create(*args, **kwargs):
            self.assertTrue(kwargs['legacy_bdm'])
            self.assertEqual(kwargs['block_device_mapping'], self.bdm)
            return old_create(*args, **kwargs)

        self.stub_out('nova.compute.api.API.create', create)

        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm}
        self.assertRaises(self.validation_error,
                          self._test_create, params, no_image=True)

    def test_create_instance_with_invalid_size(self):
        self.bdm[0]['volume_size'] = 'hello world'

        old_create = compute_api.API.create

        def create(*args, **kwargs):
            self.assertEqual(kwargs['block_device_mapping'], self.bdm)
            return old_create(*args, **kwargs)

        self.stub_out('nova.compute.api.API.create', create)

        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm}
        self.assertRaises(self.validation_error,
                          self._test_create, params, no_image=True)

    def _test_create_instance_with_destination_type_error(self,
                                                          destination_type):
        self.bdm[0]['destination_type'] = destination_type

        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm}
        self.assertRaises(self.validation_error,
                          self._test_create, params, no_image=True)

    def test_create_instance_with_destination_type_empty_string(self):
        self._test_create_instance_with_destination_type_error('')

    def test_create_instance_with_invalid_destination_type(self):
        self._test_create_instance_with_destination_type_error('fake')

    @mock.patch.object(compute_api.API, '_validate_bdm')
    def test_create_instance_bdm(self, mock_validate_bdm):
        bdm = [{
            'source_type': 'volume',
            'device_name': 'fake_dev',
            'uuid': 'fake_vol'
        }]
        bdm_expected = [{
            'source_type': 'volume',
            'device_name': 'fake_dev',
            'volume_id': 'fake_vol'
        }]

        old_create = compute_api.API.create

        def create(*args, **kwargs):
            self.assertFalse(kwargs['legacy_bdm'])
            for expected, received in zip(bdm_expected,
                                          kwargs['block_device_mapping']):
                self.assertThat(block_device.BlockDeviceDict(expected),
                                matchers.DictMatches(received))
            return old_create(*args, **kwargs)

        self.stub_out('nova.compute.api.API.create', create)

        params = {block_device_mapping.ATTRIBUTE_NAME: bdm}
        self._test_create(params, no_image=True)
        mock_validate_bdm.assert_called_once_with(mock.ANY,
                                                  mock.ANY,
                                                  mock.ANY,
                                                  mock.ANY)

    @mock.patch.object(compute_api.API, '_validate_bdm')
    def test_create_instance_bdm_missing_device_name(self, mock_validate_bdm):
        del self.bdm[0]['device_name']

        old_create = compute_api.API.create

        def create(*args, **kwargs):
            self.assertFalse(kwargs['legacy_bdm'])
            self.assertNotIn(None,
                             kwargs['block_device_mapping'][0]['device_name'])
            return old_create(*args, **kwargs)

        self.stub_out('nova.compute.api.API.create', create)

        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm}
        self._test_create(params, no_image=True)
        mock_validate_bdm.assert_called_once_with(mock.ANY,
                                                  mock.ANY,
                                                  mock.ANY,
                                                  mock.ANY)

    @mock.patch.object(
        block_device.BlockDeviceDict, '_validate',
        side_effect=exception.InvalidBDMFormat(details='Wrong BDM'))
    def test_create_instance_bdm_validation_error(self, mock_validate):
        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm}
        self.assertRaises(exc.HTTPBadRequest,
                          self._test_create, params, no_image=True)

    @mock.patch('nova.compute.api.API._get_bdm_image_metadata')
    def test_create_instance_non_bootable_volume_fails(self, fake_bdm_meta):
        params = {block_device_mapping.ATTRIBUTE_NAME: self.bdm}
        fake_bdm_meta.side_effect = exception.InvalidBDMVolumeNotBootable(id=1)
        self.assertRaises(exc.HTTPBadRequest, self._test_create, params,
                          no_image=True)

    def test_create_instance_bdm_api_validation_fails(self):
        self.validation_fail_test_validate_called = False
        self.validation_fail_instance_destroy_called = False

        bdm_exceptions = ((exception.InvalidBDMSnapshot, {'id': 'fake'}),
                          (exception.InvalidBDMVolume, {'id': 'fake'}),
                          (exception.InvalidBDMImage, {'id': 'fake'}),
                          (exception.InvalidBDMBootSequence, {}),
                          (exception.InvalidBDMLocalsLimit, {}))

        ex_iter = iter(bdm_exceptions)

        def _validate_bdm(*args, **kwargs):
            self.validation_fail_test_validate_called = True
            ex, kargs = next(ex_iter)
            raise ex(**kargs)

        def _instance_destroy(*args, **kwargs):
            self.validation_fail_instance_destroy_called = True

        self.stub_out('nova.compute.api.API._validate_bdm', _validate_bdm)
        self.stub_out('nova.objects.Instance.destroy', _instance_destroy)

        for _unused in range(len(bdm_exceptions)):
            params = {block_device_mapping.ATTRIBUTE_NAME:
                      [self.bdm[0].copy()]}
            self.assertRaises(exc.HTTPBadRequest,
                              self._test_create, params)
            self.assertTrue(self.validation_fail_test_validate_called)
            self.assertFalse(self.validation_fail_instance_destroy_called)
            self.validation_fail_test_validate_called = False
            self.validation_fail_instance_destroy_called = False
