# Copyright 2012 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_concurrency import processutils

from cinder.brick.local_dev import lvm as brick
from cinder import exception
from cinder import test
from cinder.volume import configuration as conf


class BrickLvmTestCase(test.TestCase):
    def setUp(self):
        self.configuration = mock.Mock(conf.Configuration)
        self.configuration.volume_group_name = 'fake-vg'
        super(BrickLvmTestCase, self).setUp()

        self.mock_object(processutils, 'execute', self.fake_execute)
        self.vg = brick.LVM(self.configuration.volume_group_name,
                            'sudo',
                            False, None,
                            'default',
                            self.fake_execute)

    def failed_fake_execute(obj, *cmd, **kwargs):
        return ("\n", "fake-error")

    def fake_pretend_lvm_version(obj, *cmd, **kwargs):
        return ("  LVM version:     2.03.00 (2012-03-06)\n", "")

    def fake_old_lvm_version(obj, *cmd, **kwargs):
        # Does not support thin prov or snap activation
        return ("  LVM version:     2.02.65(2) (2012-03-06)\n", "")

    def fake_customised_lvm_version(obj, *cmd, **kwargs):
        return ("  LVM version:     2.02.100(2)-RHEL6 (2013-09-12)\n", "")

    def fake_execute(obj, *cmd, **kwargs):  # noqa
        cmd_string = ', '.join(cmd)
        data = "\n"

        if ('env, LC_ALL=C, vgs, --noheadings, --unit=g, -o, name' ==
                cmd_string):
            data = "  fake-vg\n"
            data += "  some-other-vg\n"
        elif ('env, LC_ALL=C, vgs, --noheadings, -o, name, fake-vg' ==
                cmd_string):
            data = "  fake-vg\n"
        elif 'env, LC_ALL=C, vgs, --version' in cmd_string:
            data = "  LVM version:     2.02.95(2) (2012-03-06)\n"
        elif ('env, LC_ALL=C, vgs, --noheadings, -o, uuid, fake-vg' in
              cmd_string):
            data = "  kVxztV-dKpG-Rz7E-xtKY-jeju-QsYU-SLG6Z1\n"
        elif 'env, LC_ALL=C, vgs, --noheadings, --unit=g, ' \
             '-o, name,size,free,lv_count,uuid, ' \
             '--separator, :, --nosuffix' in cmd_string:
            data = ("  test-prov-cap-vg-unit:10.00:10.00:0:"
                    "mXzbuX-dKpG-Rz7E-xtKY-jeju-QsYU-SLG8Z4\n")
            if 'test-prov-cap-vg-unit' in cmd_string:
                return (data, "")
            data = ("  test-prov-cap-vg-no-unit:10.00:10.00:0:"
                    "mXzbuX-dKpG-Rz7E-xtKY-jeju-QsYU-SLG8Z4\n")
            if 'test-prov-cap-vg-no-unit' in cmd_string:
                return (data, "")
            data = "  fake-vg:10.00:10.00:0:"\
                   "kVxztV-dKpG-Rz7E-xtKY-jeju-QsYU-SLG6Z1\n"
            if 'fake-vg' in cmd_string:
                return (data, "")
            data += "  fake-vg-2:10.00:10.00:0:"\
                    "lWyauW-dKpG-Rz7E-xtKY-jeju-QsYU-SLG7Z2\n"
            data += "  fake-vg-3:10.00:10.00:0:"\
                    "mXzbuX-dKpG-Rz7E-xtKY-jeju-QsYU-SLG8Z3\n"
        elif ('env, LC_ALL=C, lvs, --noheadings, '
              '--unit=g, -o, vg_name,name,size, --nosuffix, '
              'fake-vg/lv-nothere' in cmd_string):
            raise processutils.ProcessExecutionError(
                stderr="One or more specified logical volume(s) not found.")
        elif ('env, LC_ALL=C, lvs, --noheadings, '
              '--unit=g, -o, vg_name,name,size, --nosuffix, '
              'fake-vg/lv-newerror' in cmd_string):
            raise processutils.ProcessExecutionError(
                stderr="Failed to find logical volume \"fake-vg/lv-newerror\"")
        elif ('env, LC_ALL=C, lvs, --noheadings, '
              '--unit=g, -o, vg_name,name,size' in cmd_string):
            if 'fake-unknown' in cmd_string:
                raise processutils.ProcessExecutionError(
                    stderr="One or more volume(s) not found."
                )
            if 'test-prov-cap-vg-unit' in cmd_string:
                data = "  fake-vg test-prov-cap-pool-unit 9.50g\n"
                data += "  fake-vg fake-volume-1 1.00g\n"
                data += "  fake-vg fake-volume-2 2.00g\n"
            elif 'test-prov-cap-vg-no-unit' in cmd_string:
                data = "  fake-vg test-prov-cap-pool-no-unit 9.50\n"
                data += "  fake-vg fake-volume-1 1.00\n"
                data += "  fake-vg fake-volume-2 2.00\n"
            elif 'test-found-lv-name' in cmd_string:
                data = "  fake-vg test-found-lv-name 9.50\n"
            else:
                data = "  fake-vg fake-1 1.00g\n"
                data += "  fake-vg fake-2 1.00g\n"
        elif ('env, LC_ALL=C, lvdisplay, --noheading, -C, -o, Attr' in
              cmd_string):
            if 'test-volumes' in cmd_string:
                data = '  wi-a-'
            elif 'snapshot' in cmd_string:
                data = '  swi-a-s--'
            elif 'open' in cmd_string:
                data = '  -wi-ao---'
            else:
                data = '  owi-a-'
        elif ('env, LC_ALL=C, lvdisplay, --noheading, -C, -o, Origin' in
              cmd_string):
            if 'snapshot' in cmd_string:
                data = '  fake-volume-1'
            else:
                data = '       '
        elif 'env, LC_ALL=C, pvs, --noheadings' in cmd_string:
            data = "  fake-vg|/dev/sda|10.00|1.00\n"
            data += "  fake-vg|/dev/sdb|10.00|1.00\n"
            data += "  fake-vg|/dev/sdc|10.00|8.99\n"
            data += "  fake-vg-2|/dev/sdd|10.00|9.99\n"
        elif 'env, LC_ALL=C, lvs, --noheadings, --unit=g' \
             ', -o, size,data_percent, --separator, :' in cmd_string:
            if 'test-prov-cap-pool' in cmd_string:
                data = "  9.5:20\n"
            else:
                data = "  9:12\n"
        elif 'lvcreate, -T, -L, ' in cmd_string:
            pass
        elif 'lvcreate, -T, -V, ' in cmd_string:
            pass
        elif 'lvcreate, -n, ' in cmd_string:
            pass
        elif 'lvcreate, --name, ' in cmd_string:
            pass
        elif 'lvextend, -L, ' in cmd_string:
            pass
        else:
            raise AssertionError('unexpected command called: %s' % cmd_string)

        return (data, "")

    def test_create_lv_snapshot(self):
        self.assertIsNone(self.vg.create_lv_snapshot('snapshot-1', 'fake-1'))

        with mock.patch.object(self.vg, 'get_volume', return_value=None):
            try:
                self.vg.create_lv_snapshot('snapshot-1', 'fake-non-existent')
            except exception.VolumeDeviceNotFound as e:
                self.assertEqual('fake-non-existent', e.kwargs['device'])
            else:
                self.fail("Exception not raised")

    def test_vg_exists(self):
        self.assertTrue(self.vg._vg_exists())

    def test_get_all_volumes(self):
        out = self.vg.get_volumes()

        self.assertEqual('fake-1', out[0]['name'])
        self.assertEqual('1.00g', out[0]['size'])
        self.assertEqual('fake-vg', out[0]['vg'])

    def test_get_volume(self):
        self.assertEqual('fake-1', self.vg.get_volume('fake-1')['name'])

    def test_get_volume_none(self):
        self.assertIsNone(self.vg.get_volume('fake-unknown'))

    def test_get_lv_info_notfound(self):
        # lv-nothere will raise lvm < 2.102.112 exception
        self.assertEqual(
            [],
            self.vg.get_lv_info(
                'sudo', vg_name='fake-vg', lv_name='lv-nothere')
        )
        # lv-newerror will raise lvm > 2.102.112 exception
        self.assertEqual(
            [],
            self.vg.get_lv_info(
                'sudo', vg_name='fake-vg', lv_name='lv-newerror')
        )

    def test_get_lv_info_found(self):
        lv_info = [{'size': '9.50', 'name': 'test-found-lv-name',
                    'vg': 'fake-vg'}]
        self.assertEqual(
            lv_info,
            self.vg.get_lv_info(
                'sudo', vg_name='fake-vg',
                lv_name='test-found-lv-name')
        )

    def test_get_lv_info_no_lv_name(self):
        lv_info = [{'name': 'fake-1', 'size': '1.00g', 'vg': 'fake-vg'},
                   {'name': 'fake-2', 'size': '1.00g', 'vg': 'fake-vg'}]
        self.assertEqual(
            lv_info,
            self.vg.get_lv_info(
                'sudo', vg_name='fake-vg')
        )

    def test_get_all_physical_volumes(self):
        # Filtered VG version
        pvs = self.vg.get_all_physical_volumes('sudo', 'fake-vg')
        self.assertEqual(3, len(pvs))

        # Non-Filtered, all VG's
        pvs = self.vg.get_all_physical_volumes('sudo')
        self.assertEqual(4, len(pvs))

    def test_get_volume_groups(self):
        self.assertEqual(3, len(self.vg.get_all_volume_groups('sudo')))
        self.assertEqual(1,
                         len(self.vg.get_all_volume_groups('sudo', 'fake-vg')))

    def test_thin_support(self):
        # lvm.supports_thin() is a static method and doesn't
        # use the self._executor fake we pass in on init
        # so we need to stub processutils.execute appropriately

        self.assertTrue(self.vg.supports_thin_provisioning('sudo'))

        with mock.patch.object(processutils, 'execute',
                               self.fake_pretend_lvm_version):
            self.assertTrue(self.vg.supports_thin_provisioning('sudo'))

        with mock.patch.object(processutils, 'execute',
                               self.fake_old_lvm_version):
            self.assertFalse(self.vg.supports_thin_provisioning('sudo'))

        with mock.patch.object(processutils, 'execute',
                               self.fake_customised_lvm_version):
            self.assertTrue(self.vg.supports_thin_provisioning('sudo'))

    def test_snapshot_lv_activate_support(self):
        self.vg._supports_snapshot_lv_activation = None
        self.assertTrue(self.vg.supports_snapshot_lv_activation)

        self.vg._supports_snapshot_lv_activation = None
        with mock.patch.object(processutils, 'execute',
                               self.fake_old_lvm_version):
            self.assertFalse(self.vg.supports_snapshot_lv_activation)

        self.vg._supports_snapshot_lv_activation = None

    def test_lvchange_ignskipact_support_yes(self):
        """Tests if lvchange -K is available via a lvm2 version check."""

        self.vg._supports_lvchange_ignoreskipactivation = None
        with mock.patch.object(processutils, 'execute',
                               self.fake_pretend_lvm_version):
            self.assertTrue(self.vg.supports_lvchange_ignoreskipactivation)

        self.vg._supports_lvchange_ignoreskipactivation = None
        with mock.patch.object(processutils, 'execute',
                               self.fake_old_lvm_version):
            self.assertFalse(self.vg.supports_lvchange_ignoreskipactivation)

        self.vg._supports_lvchange_ignoreskipactivation = None

    def test_thin_pool_creation(self):

        # The size of fake-vg volume group is 10g, so the calculated thin
        # pool size should be 9.5g (95% of 10g).
        self.assertEqual("9.5g", self.vg.create_thin_pool())

        # Passing a size parameter should result in a thin pool of that exact
        # size.
        for size in ("1g", "1.2g", "1.75g"):
            self.assertEqual(size, self.vg.create_thin_pool(size_str=size))

    def test_thin_pool_provisioned_capacity(self):
        self.vg.vg_thin_pool = "test-prov-cap-pool-unit"
        self.vg.vg_name = 'test-prov-cap-vg-unit'
        self.assertEqual(
            "9.5g",
            self.vg.create_thin_pool(name=self.vg.vg_thin_pool))
        self.assertEqual("9.50", self.vg.vg_thin_pool_size)
        self.assertEqual(7.6, self.vg.vg_thin_pool_free_space)
        self.assertEqual(3.0, self.vg.vg_provisioned_capacity)

        self.vg.vg_thin_pool = "test-prov-cap-pool-no-unit"
        self.vg.vg_name = 'test-prov-cap-vg-no-unit'
        self.assertEqual(
            "9.5g",
            self.vg.create_thin_pool(name=self.vg.vg_thin_pool))
        self.assertEqual("9.50", self.vg.vg_thin_pool_size)
        self.assertEqual(7.6, self.vg.vg_thin_pool_free_space)
        self.assertEqual(3.0, self.vg.vg_provisioned_capacity)

    def test_thin_pool_free_space(self):
        # The size of fake-vg-pool is 9g and the allocated data sums up to
        # 12% so the calculated free space should be 7.92
        self.assertEqual(float("7.92"),
                         self.vg._get_thin_pool_free_space("fake-vg",
                                                           "fake-vg-pool"))

    def test_volume_create_after_thin_creation(self):
        """Test self.vg.vg_thin_pool is set to pool_name

        See bug #1220286 for more info.
        """

        vg_name = "vg-name"
        pool_name = vg_name + "-pool"
        pool_path = "%s/%s" % (vg_name, pool_name)

        def executor(obj, *cmd, **kwargs):
            self.assertEqual(pool_path, cmd[-1])

        self.vg._executor = executor
        self.vg.create_thin_pool(pool_name, "1G")
        self.vg.create_volume("test", "1G", lv_type='thin')

        self.assertEqual(pool_name, self.vg.vg_thin_pool)

    def test_lv_has_snapshot(self):
        self.assertTrue(self.vg.lv_has_snapshot('fake-vg'))
        self.assertFalse(self.vg.lv_has_snapshot('test-volumes'))

    def test_lv_is_snapshot(self):
        self.assertTrue(self.vg.lv_is_snapshot('fake-snapshot'))
        self.assertFalse(self.vg.lv_is_snapshot('test-volumes'))

    def test_lv_is_open(self):
        self.assertTrue(self.vg.lv_is_open('fake-open'))
        self.assertFalse(self.vg.lv_is_open('fake-snapshot'))

    def test_lv_get_origin(self):
        self.assertEqual('fake-volume-1',
                         self.vg.lv_get_origin('fake-snapshot'))
        self.assertFalse(None, self.vg.lv_get_origin('test-volumes'))

    def test_activate_lv(self):
        with mock.patch.object(self.vg, '_execute'):
            self.vg._supports_lvchange_ignoreskipactivation = True

            self.vg._execute('lvchange', '-a', 'y', '--yes', '-K',
                             'fake-vg/my-lv',
                             root_helper='sudo', run_as_root=True)

            self.vg.activate_lv('my-lv')

    def test_get_mirrored_available_capacity(self):
        self.assertEqual(2.0, self.vg.vg_mirror_free_space(1))

    def test_lv_extend(self):
        self.vg.deactivate_lv = mock.MagicMock()

        # Extend lv with snapshot and make sure deactivate called
        self.vg.create_volume("test", "1G")
        self.vg.extend_volume("test", "2G")
        self.vg.deactivate_lv.assert_called_once_with('test')
        self.vg.deactivate_lv.reset_mock()

        # Extend lv without snapshot so deactivate should not be called
        self.vg.create_volume("test", "1G")
        self.vg.vg_name = "test-volumes"
        self.vg.extend_volume("test", "2G")
        self.assertFalse(self.vg.deactivate_lv.called)

    def test_lv_deactivate(self):
        with mock.patch.object(self.vg, '_execute'):
            is_active_mock = mock.Mock()
            is_active_mock.return_value = False
            self.vg._lv_is_active = is_active_mock
            self.vg.create_volume('test', '1G')
            self.vg.deactivate_lv('test')

    def test_lv_deactivate_timeout(self):
        with mock.patch.object(self.vg, '_execute'):
            is_active_mock = mock.Mock()
            is_active_mock.return_value = True
            self.vg._lv_is_active = is_active_mock
            self.vg.create_volume('test', '1G')
            self.assertRaises(exception.VolumeNotDeactivated,
                              self.vg.deactivate_lv, 'test')
