# Copyright 2016 IBM Corp.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

"""
Unit tests for the nova-status CLI interfaces.
"""

# NOTE(cdent): Additional tests of nova-status may be found in
# nova/tests/functional/test_nova_status.py. Those tests use the external
# PlacementFixture, which is only available in functioanl tests.

from io import StringIO

import fixtures
import mock

from keystoneauth1 import exceptions as ks_exc
from keystoneauth1 import loading as keystone
from keystoneauth1 import session
from oslo_upgradecheck import upgradecheck
from oslo_utils.fixture import uuidsentinel as uuids
from requests import models

from nova.cmd import status
import nova.conf
from nova import context
from nova import exception
# NOTE(mriedem): We only use objects as a convenience to populate the database
# in the tests, we don't use them in the actual CLI.
from nova import objects
from nova.objects import service
from nova import policy
from nova import test
from nova.tests import fixtures as nova_fixtures


CONF = nova.conf.CONF


class TestNovaStatusMain(test.NoDBTestCase):
    """Tests for the basic nova-status command infrastructure."""

    def setUp(self):
        super(TestNovaStatusMain, self).setUp()
        self.output = StringIO()
        self.useFixture(fixtures.MonkeyPatch('sys.stdout', self.output))

    @mock.patch.object(status.config, 'parse_args')
    @mock.patch.object(status, 'CONF')
    def _check_main(self, mock_CONF, mock_parse_args,
                    category_name='check', expected_return_value=0):
        mock_CONF.category.name = category_name
        return_value = status.main()

        self.assertEqual(expected_return_value, return_value)
        mock_CONF.register_cli_opt.assert_called_once_with(
            status.category_opt)

    @mock.patch.object(status.version, 'version_string_with_package',
                       return_value="x.x.x")
    def test_main_version(self, mock_version_string):
        self._check_main(category_name='version')
        self.assertEqual("x.x.x\n", self.output.getvalue())

    @mock.patch.object(status.cmd_common, 'print_bash_completion')
    def test_main_bash_completion(self, mock_print_bash):
        self._check_main(category_name='bash-completion')
        mock_print_bash.assert_called_once_with(status.CATEGORIES)

    @mock.patch.object(status.cmd_common, 'get_action_fn')
    def test_main(self, mock_get_action_fn):
        mock_fn = mock.Mock()
        mock_fn_args = [mock.sentinel.arg]
        mock_fn_kwargs = {'key': mock.sentinel.value}
        mock_get_action_fn.return_value = (mock_fn, mock_fn_args,
                                           mock_fn_kwargs)

        self._check_main(expected_return_value=mock_fn.return_value)
        mock_fn.assert_called_once_with(mock.sentinel.arg,
                                        key=mock.sentinel.value)

    @mock.patch.object(status.cmd_common, 'get_action_fn')
    def test_main_error(self, mock_get_action_fn):
        mock_fn = mock.Mock(side_effect=Exception('wut'))
        mock_get_action_fn.return_value = (mock_fn, [], {})

        self._check_main(expected_return_value=255)
        output = self.output.getvalue()
        self.assertIn('Error:', output)
        # assert the traceback is in the output
        self.assertIn('wut', output)


class TestPlacementCheck(test.NoDBTestCase):
    """Tests the nova-status placement checks.

    These are done with mock as the ability to replicate all failure
    domains otherwise is quite complicated. Using a devstack
    environment you can validate each of these tests are matching
    reality.
    """

    def setUp(self):
        super(TestPlacementCheck, self).setUp()
        self.output = StringIO()
        self.useFixture(fixtures.MonkeyPatch('sys.stdout', self.output))
        self.cmd = status.UpgradeCommands()

    @mock.patch.object(keystone, "load_auth_from_conf_options")
    def test_no_auth(self, auth):
        """Test failure when no credentials are specified.

        Replicate in devstack: start devstack with or without
        placement engine, remove the auth section from the [placement]
        block in nova.conf.
        """
        auth.side_effect = ks_exc.MissingAuthPlugin()
        res = self.cmd._check_placement()
        self.assertEqual(upgradecheck.Code.FAILURE, res.code)
        self.assertIn('No credentials specified', res.details)

    @mock.patch.object(keystone, "load_auth_from_conf_options")
    @mock.patch.object(session.Session, 'request')
    def _test_placement_get_interface(
            self, expected_interface, mock_get, mock_auth):

        def fake_request(path, method, *a, **kw):
            self.assertEqual(mock.sentinel.path, path)
            self.assertEqual('GET', method)
            self.assertIn('endpoint_filter', kw)
            self.assertEqual(expected_interface,
                             kw['endpoint_filter']['interface'])
            return mock.Mock(autospec=models.Response)

        mock_get.side_effect = fake_request
        self.cmd._placement_get(mock.sentinel.path)
        mock_auth.assert_called_once_with(status.CONF, 'placement')
        self.assertTrue(mock_get.called)

    def test_placement_get_interface_default(self):
        """Tests that we try internal, then public interface by default."""
        self._test_placement_get_interface(['internal', 'public'])

    def test_placement_get_interface_internal(self):
        """Tests that "internal" is specified for interface when configured."""
        self.flags(valid_interfaces='internal', group='placement')
        self._test_placement_get_interface(['internal'])

    @mock.patch.object(status.UpgradeCommands, "_placement_get")
    def test_invalid_auth(self, get):
        """Test failure when wrong credentials are specified or service user
        doesn't exist.

        Replicate in devstack: start devstack with or without
        placement engine, specify random credentials in auth section
        from the [placement] block in nova.conf.

        """
        get.side_effect = ks_exc.Unauthorized()
        res = self.cmd._check_placement()
        self.assertEqual(upgradecheck.Code.FAILURE, res.code)
        self.assertIn('Placement service credentials do not work', res.details)

    @mock.patch.object(status.UpgradeCommands, "_placement_get")
    def test_invalid_endpoint(self, get):
        """Test failure when no endpoint exists.

        Replicate in devstack: start devstack without placement
        engine, but create valid placement service user and specify it
        in auth section of [placement] in nova.conf.
        """
        get.side_effect = ks_exc.EndpointNotFound()
        res = self.cmd._check_placement()
        self.assertEqual(upgradecheck.Code.FAILURE, res.code)
        self.assertIn('Placement API endpoint not found', res.details)

    @mock.patch.object(status.UpgradeCommands, "_placement_get")
    def test_discovery_failure(self, get):
        """Test failure when discovery for placement URL failed.

        Replicate in devstack: start devstack with placement
        engine, create valid placement service user and specify it
        in auth section of [placement] in nova.conf. Stop keystone service.
        """
        get.side_effect = ks_exc.DiscoveryFailure()
        res = self.cmd._check_placement()
        self.assertEqual(upgradecheck.Code.FAILURE, res.code)
        self.assertIn('Discovery for placement API URI failed.', res.details)

    @mock.patch.object(status.UpgradeCommands, "_placement_get")
    def test_down_endpoint(self, get):
        """Test failure when endpoint is down.

        Replicate in devstack: start devstack with placement
        engine, disable placement engine apache config.
        """
        get.side_effect = ks_exc.NotFound()
        res = self.cmd._check_placement()
        self.assertEqual(upgradecheck.Code.FAILURE, res.code)
        self.assertIn('Placement API does not seem to be running', res.details)

    @mock.patch.object(status.UpgradeCommands, "_placement_get")
    def test_valid_version(self, get):
        get.return_value = {
            "versions": [
                {
                    "min_version": "1.0",
                    "max_version": status.MIN_PLACEMENT_MICROVERSION,
                    "id": "v1.0"
                }
            ]
        }
        res = self.cmd._check_placement()
        self.assertEqual(upgradecheck.Code.SUCCESS, res.code)

    @mock.patch.object(status.UpgradeCommands, "_placement_get")
    def test_version_comparison_does_not_use_floats(self, get):
        # NOTE(rpodolyaka): previously _check_placement() coerced the version
        # numbers to floats prior to comparison, that would lead to failures
        # in cases like float('1.10') < float('1.4'). As we require 1.4+ now,
        # the _check_placement() call below will assert that version comparison
        # continues to work correctly when Placement API versions 1.10
        # (or newer) is released
        get.return_value = {
             "versions": [
                {
                    "min_version": "1.0",
                    "max_version": status.MIN_PLACEMENT_MICROVERSION,
                    "id": "v1.0"
                }
            ]
        }
        res = self.cmd._check_placement()
        self.assertEqual(upgradecheck.Code.SUCCESS, res.code)

    @mock.patch.object(status.UpgradeCommands, "_placement_get")
    def test_invalid_version(self, get):
        get.return_value = {
            "versions": [
                {
                    "min_version": "0.9",
                    "max_version": "0.9",
                    "id": "v1.0"
                }
            ]
        }
        res = self.cmd._check_placement()
        self.assertEqual(upgradecheck.Code.FAILURE, res.code)
        self.assertIn('Placement API version %s needed, you have 0.9' %
                      status.MIN_PLACEMENT_MICROVERSION, res.details)


class TestUpgradeCheckCellsV2(test.NoDBTestCase):
    """Tests for the nova-status upgrade cells v2 specific check."""

    # We'll setup the API DB fixture ourselves and slowly build up the
    # contents until the check passes.
    USES_DB_SELF = True

    def setUp(self):
        super(TestUpgradeCheckCellsV2, self).setUp()
        self.output = StringIO()
        self.useFixture(fixtures.MonkeyPatch('sys.stdout', self.output))
        self.useFixture(nova_fixtures.Database(database='api'))
        self.cmd = status.UpgradeCommands()

    def test_check_no_cell_mappings(self):
        """The cells v2 check should fail because there are no cell mappings.
        """
        result = self.cmd._check_cellsv2()
        self.assertEqual(upgradecheck.Code.FAILURE, result.code)
        self.assertIn('There needs to be at least two cell mappings',
                      result.details)

    def _create_cell_mapping(self, uuid):
        cm = objects.CellMapping(
            context=context.get_admin_context(),
            uuid=uuid,
            name=uuid,
            transport_url='fake://%s/' % uuid,
            database_connection=uuid)
        cm.create()
        return cm

    def test_check_no_cell0_mapping(self):
        """We'll create two cell mappings but not have cell0 mapped yet."""
        for i in range(2):
            uuid = getattr(uuids, str(i))
            self._create_cell_mapping(uuid)

        result = self.cmd._check_cellsv2()
        self.assertEqual(upgradecheck.Code.FAILURE, result.code)
        self.assertIn('No cell0 mapping found', result.details)

    def test_check_no_host_mappings_with_computes(self):
        """Creates a cell0 and cell1 mapping but no host mappings and there are
        compute nodes in the cell database.
        """
        self._setup_cells()
        cn = objects.ComputeNode(
            context=context.get_admin_context(),
            host='fake-host',
            vcpus=4,
            memory_mb=8 * 1024,
            local_gb=40,
            vcpus_used=2,
            memory_mb_used=2 * 1024,
            local_gb_used=10,
            hypervisor_type='fake',
            hypervisor_version=1,
            cpu_info='{"arch": "x86_64"}')
        cn.create()

        result = self.cmd._check_cellsv2()
        self.assertEqual(upgradecheck.Code.FAILURE, result.code)
        self.assertIn('No host mappings found but there are compute nodes',
                      result.details)

    def test_check_no_host_mappings_no_computes(self):
        """Creates the cell0 and cell1 mappings but no host mappings and no
        compute nodes so it's assumed to be an initial install.
        """
        self._setup_cells()

        result = self.cmd._check_cellsv2()
        self.assertEqual(upgradecheck.Code.SUCCESS, result.code)
        self.assertIn('No host mappings or compute nodes were found',
                      result.details)

    def test_check_success(self):
        """Tests a successful cells v2 upgrade check."""
        # create the cell0 and first cell mappings
        self._setup_cells()
        # Start a compute service and create a hostmapping for it
        svc = self.start_service('compute')
        cell = self.cell_mappings[test.CELL1_NAME]
        hm = objects.HostMapping(context=context.get_admin_context(),
                                 host=svc.host,
                                 cell_mapping=cell)
        hm.create()

        result = self.cmd._check_cellsv2()
        self.assertEqual(upgradecheck.Code.SUCCESS, result.code)
        self.assertIsNone(result.details)


class TestUpgradeCheckCinderAPI(test.NoDBTestCase):

    def setUp(self):
        super(TestUpgradeCheckCinderAPI, self).setUp()
        self.cmd = status.UpgradeCommands()

    def test_cinder_not_configured(self):
        self.flags(auth_type=None, group='cinder')
        self.assertEqual(upgradecheck.Code.SUCCESS,
                         self.cmd._check_cinder().code)

    @mock.patch('nova.volume.cinder.is_microversion_supported',
                side_effect=exception.CinderAPIVersionNotAvailable(
                    version='3.44'))
    def test_microversion_not_available(self, mock_version_check):
        self.flags(auth_type='password', group='cinder')
        result = self.cmd._check_cinder()
        mock_version_check.assert_called_once()
        self.assertEqual(upgradecheck.Code.FAILURE, result.code)
        self.assertIn('Cinder API 3.44 or greater is required.',
                      result.details)

    @mock.patch('nova.volume.cinder.is_microversion_supported',
                side_effect=test.TestingException('oops'))
    def test_unknown_error(self, mock_version_check):
        self.flags(auth_type='password', group='cinder')
        result = self.cmd._check_cinder()
        mock_version_check.assert_called_once()
        self.assertEqual(upgradecheck.Code.WARNING, result.code)
        self.assertIn('oops', result.details)

    @mock.patch('nova.volume.cinder.is_microversion_supported')
    def test_microversion_available(self, mock_version_check):
        self.flags(auth_type='password', group='cinder')
        result = self.cmd._check_cinder()
        mock_version_check.assert_called_once()
        self.assertEqual(upgradecheck.Code.SUCCESS, result.code)


class TestUpgradeCheckPolicy(test.NoDBTestCase):

    new_default_status = upgradecheck.Code.WARNING

    def setUp(self):
        super(TestUpgradeCheckPolicy, self).setUp()
        self.cmd = status.UpgradeCommands()
        self.rule_name = "context_is_admin"

    def tearDown(self):
        super(TestUpgradeCheckPolicy, self).tearDown()
        # Check if policy is reset back after the upgrade check
        self.assertIsNone(policy._ENFORCER)

    def test_policy_rule_with_new_defaults(self):
        new_default = "role:admin and system_scope:all"
        rule = {self.rule_name: new_default}
        self.policy.set_rules(rule, overwrite=False)
        self.assertEqual(self.new_default_status,
                         self.cmd._check_policy().code)

    def test_policy_rule_with_old_defaults(self):
        new_default = "is_admin:True"
        rule = {self.rule_name: new_default}
        self.policy.set_rules(rule, overwrite=False)

        self.assertEqual(upgradecheck.Code.SUCCESS,
                         self.cmd._check_policy().code)

    def test_policy_rule_with_both_defaults(self):
        new_default = "(role:admin and system_scope:all) or is_admin:True"
        rule = {self.rule_name: new_default}
        self.policy.set_rules(rule, overwrite=False)

        self.assertEqual(upgradecheck.Code.SUCCESS,
                         self.cmd._check_policy().code)

    def test_policy_checks_with_fresh_init_and_no_policy_override(self):
        self.policy = self.useFixture(nova_fixtures.OverridePolicyFixture(
                                      rules_in_file={}))
        policy.reset()
        self.assertEqual(upgradecheck.Code.SUCCESS,
                         self.cmd._check_policy().code)


class TestUpgradeCheckPolicyEnableScope(TestUpgradeCheckPolicy):

    new_default_status = upgradecheck.Code.SUCCESS

    def setUp(self):
        super(TestUpgradeCheckPolicyEnableScope, self).setUp()
        self.flags(enforce_scope=True, group="oslo_policy")


class TestUpgradeCheckOldCompute(test.NoDBTestCase):

    def setUp(self):
        super(TestUpgradeCheckOldCompute, self).setUp()
        self.cmd = status.UpgradeCommands()

    def test_no_compute(self):
        self.assertEqual(
            upgradecheck.Code.SUCCESS, self.cmd._check_old_computes().code)

    def test_only_new_compute(self):
        last_supported_version = service.SERVICE_VERSION_ALIASES[
            service.OLDEST_SUPPORTED_SERVICE_VERSION]
        with mock.patch(
                "nova.objects.service.get_minimum_version_all_cells",
                return_value=last_supported_version):
            self.assertEqual(
                upgradecheck.Code.SUCCESS, self.cmd._check_old_computes().code)

    def test_old_compute(self):
        too_old = service.SERVICE_VERSION_ALIASES[
            service.OLDEST_SUPPORTED_SERVICE_VERSION] - 1
        with mock.patch(
                "nova.objects.service.get_minimum_version_all_cells",
                return_value=too_old):
            result = self.cmd._check_old_computes()
            self.assertEqual(upgradecheck.Code.WARNING, result.code)


class TestCheckMachineTypeUnset(test.NoDBTestCase):

    def setUp(self):
        super().setUp()
        self.cmd = status.UpgradeCommands()

    @mock.patch(
        'nova.virt.libvirt.machine_type_utils.get_instances_without_type',
        new=mock.Mock(return_value=[mock.Mock(spec=objects.Instance)]))
    def test_instances_found_without_hw_machine_type(self):
        result = self.cmd._check_machine_type_set()
        self.assertEqual(
            upgradecheck.Code.WARNING,
            result.code
        )

    @mock.patch(
        'nova.virt.libvirt.machine_type_utils.get_instances_without_type',
        new=mock.Mock(return_value=[]))
    def test_instances_not_found_without_hw_machine_type(self):
        result = self.cmd._check_machine_type_set()
        self.assertEqual(
            upgradecheck.Code.SUCCESS,
            result.code
        )
