
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.

"""
Unit Tests for remote procedure calls using queue
"""

import mock
from oslo_concurrency import processutils
from oslo_config import cfg
from oslo_db import exception as db_exc

from cinder import context
from cinder import db
from cinder import exception
from cinder import manager
from cinder import objects
from cinder import rpc
from cinder import service
from cinder import test
from cinder.wsgi import common as wsgi


test_service_opts = [
    cfg.StrOpt("fake_manager",
               default="cinder.tests.unit.test_service.FakeManager",
               help="Manager for testing"),
    cfg.StrOpt("test_service_listen",
               default=None,
               help="Host to bind test service to"),
    cfg.IntOpt("test_service_listen_port",
               default=0,
               help="Port number to bind test service to"), ]

CONF = cfg.CONF
CONF.register_opts(test_service_opts)


class FakeManager(manager.Manager):
    """Fake manager for tests."""
    def __init__(self, host=None,
                 db_driver=None, service_name=None):
        super(FakeManager, self).__init__(host=host,
                                          db_driver=db_driver)

    def test_method(self):
        return 'manager'


class ExtendedService(service.Service):
    def test_method(self):
        return 'service'


class ServiceManagerTestCase(test.TestCase):
    """Test cases for Services."""

    def test_message_gets_to_manager(self):
        serv = service.Service('test',
                               'test',
                               'test',
                               'cinder.tests.unit.test_service.FakeManager')
        serv.start()
        self.assertEqual('manager', serv.test_method())

    def test_override_manager_method(self):
        serv = ExtendedService('test',
                               'test',
                               'test',
                               'cinder.tests.unit.test_service.FakeManager')
        serv.start()
        self.assertEqual('service', serv.test_method())


class ServiceFlagsTestCase(test.TestCase):
    def test_service_enabled_on_create_based_on_flag(self):
        self.flags(enable_new_services=True)
        host = 'foo'
        binary = 'cinder-fake'
        app = service.Service.create(host=host, binary=binary)
        app.start()
        app.stop()
        ref = db.service_get(context.get_admin_context(), app.service_id)
        db.service_destroy(context.get_admin_context(), app.service_id)
        self.assertFalse(ref['disabled'])

    def test_service_disabled_on_create_based_on_flag(self):
        self.flags(enable_new_services=False)
        host = 'foo'
        binary = 'cinder-fake'
        app = service.Service.create(host=host, binary=binary)
        app.start()
        app.stop()
        ref = db.service_get(context.get_admin_context(), app.service_id)
        db.service_destroy(context.get_admin_context(), app.service_id)
        self.assertTrue(ref['disabled'])


class ServiceTestCase(test.TestCase):
    """Test cases for Services."""

    def setUp(self):
        super(ServiceTestCase, self).setUp()
        self.host = 'foo'
        self.binary = 'cinder-fake'
        self.topic = 'fake'

    def test_create(self):
        # NOTE(vish): Create was moved out of mock replay to make sure that
        #             the looping calls are created in StartService.
        app = service.Service.create(host=self.host,
                                     binary=self.binary,
                                     topic=self.topic)

        self.assertTrue(app)

    def test_report_state_newly_disconnected(self):
        service_ref = {'host': self.host,
                       'binary': self.binary,
                       'topic': self.topic,
                       'report_count': 0,
                       'availability_zone': 'nova',
                       'id': 1}
        with mock.patch.object(objects.service, 'db') as mock_db:
            mock_db.service_get_by_args.side_effect = exception.NotFound()
            mock_db.service_create.return_value = service_ref
            mock_db.service_get.side_effect = db_exc.DBConnectionError()

            serv = service.Service(
                self.host,
                self.binary,
                self.topic,
                'cinder.tests.unit.test_service.FakeManager'
            )
            serv.start()
            serv.report_state()
            self.assertTrue(serv.model_disconnected)
            self.assertFalse(mock_db.service_update.called)

    def test_report_state_disconnected_DBError(self):
        service_ref = {'host': self.host,
                       'binary': self.binary,
                       'topic': self.topic,
                       'report_count': 0,
                       'availability_zone': 'nova',
                       'id': 1}
        with mock.patch.object(objects.service, 'db') as mock_db:
            mock_db.service_get_by_args.side_effect = exception.NotFound()
            mock_db.service_create.return_value = service_ref
            mock_db.service_get.side_effect = db_exc.DBError()

            serv = service.Service(
                self.host,
                self.binary,
                self.topic,
                'cinder.tests.unit.test_service.FakeManager'
            )
            serv.start()
            serv.report_state()
            self.assertTrue(serv.model_disconnected)
            self.assertFalse(mock_db.service_update.called)

    def test_report_state_newly_connected(self):
        service_ref = {'host': self.host,
                       'binary': self.binary,
                       'topic': self.topic,
                       'report_count': 0,
                       'availability_zone': 'nova',
                       'id': 1}
        with mock.patch.object(objects.service, 'db') as mock_db:
            mock_db.service_get_by_args.side_effect = exception.NotFound()
            mock_db.service_create.return_value = service_ref
            mock_db.service_get.return_value = service_ref

            serv = service.Service(
                self.host,
                self.binary,
                self.topic,
                'cinder.tests.unit.test_service.FakeManager'
            )
            serv.start()
            serv.model_disconnected = True
            serv.report_state()

            self.assertFalse(serv.model_disconnected)
            self.assertTrue(mock_db.service_update.called)

    def test_report_state_manager_not_working(self):
        service_ref = {'host': self.host,
                       'binary': self.binary,
                       'topic': self.topic,
                       'report_count': 0,
                       'availability_zone': 'nova',
                       'id': 1}
        with mock.patch('cinder.db') as mock_db:
            mock_db.service_get.return_value = service_ref

            serv = service.Service(
                self.host,
                self.binary,
                self.topic,
                'cinder.tests.unit.test_service.FakeManager'
            )
            serv.manager.is_working = mock.Mock(return_value=False)
            serv.start()
            serv.report_state()

            serv.manager.is_working.assert_called_once_with()
            self.assertFalse(mock_db.service_update.called)

    def test_service_with_long_report_interval(self):
        self.override_config('service_down_time', 10)
        self.override_config('report_interval', 10)
        service.Service.create(
            binary="test_service",
            manager="cinder.tests.unit.test_service.FakeManager")
        self.assertEqual(25, CONF.service_down_time)

    @mock.patch.object(rpc, 'get_server')
    @mock.patch('cinder.db')
    def test_service_stop_waits_for_rpcserver(self, mock_db, mock_rpc):
        serv = service.Service(
            self.host,
            self.binary,
            self.topic,
            'cinder.tests.unit.test_service.FakeManager'
        )
        serv.start()
        serv.stop()
        serv.wait()
        serv.rpcserver.start.assert_called_once_with()
        serv.rpcserver.stop.assert_called_once_with()
        serv.rpcserver.wait.assert_called_once_with()


class TestWSGIService(test.TestCase):

    def setUp(self):
        super(TestWSGIService, self).setUp()

    def test_service_random_port(self):
        with mock.patch.object(wsgi.Loader, 'load_app') as mock_load_app:
            test_service = service.WSGIService("test_service")
            self.assertEqual(0, test_service.port)
            test_service.start()
            self.assertNotEqual(0, test_service.port)
            test_service.stop()
            self.assertTrue(mock_load_app.called)

    def test_reset_pool_size_to_default(self):
        with mock.patch.object(wsgi.Loader, 'load_app') as mock_load_app:
            test_service = service.WSGIService("test_service")
            test_service.start()

            # Stopping the service, which in turn sets pool size to 0
            test_service.stop()
            self.assertEqual(0, test_service.server._pool.size)

            # Resetting pool size to default
            test_service.reset()
            test_service.start()
            self.assertEqual(1000, test_service.server._pool.size)
            self.assertTrue(mock_load_app.called)

    @mock.patch('cinder.wsgi.eventlet_server.Server')
    def test_workers_set_default(self, wsgi_server):
        test_service = service.WSGIService("osapi_volume")
        self.assertEqual(processutils.get_worker_count(), test_service.workers)

    @mock.patch('cinder.wsgi.eventlet_server.Server')
    def test_workers_set_good_user_setting(self, wsgi_server):
        self.override_config('osapi_volume_workers', 8)
        test_service = service.WSGIService("osapi_volume")
        self.assertEqual(8, test_service.workers)

    @mock.patch('cinder.wsgi.eventlet_server.Server')
    def test_workers_set_zero_user_setting(self, wsgi_server):
        self.override_config('osapi_volume_workers', 0)
        test_service = service.WSGIService("osapi_volume")
        # If a value less than 1 is used, defaults to number of procs available
        self.assertEqual(processutils.get_worker_count(), test_service.workers)

    @mock.patch('cinder.wsgi.eventlet_server.Server')
    def test_workers_set_negative_user_setting(self, wsgi_server):
        self.override_config('osapi_volume_workers', -1)
        self.assertRaises(exception.InvalidInput,
                          service.WSGIService,
                          "osapi_volume")
        self.assertFalse(wsgi_server.called)


class OSCompatibilityTestCase(test.TestCase):
    def _test_service_launcher(self, fake_os):
        # Note(lpetrut): The cinder-volume service needs to be spawned
        # differently on Windows due to an eventlet bug. For this reason,
        # we must check the process launcher used.
        fake_process_launcher = mock.MagicMock()
        with mock.patch('os.name', fake_os):
            with mock.patch('cinder.service.process_launcher',
                            fake_process_launcher):
                launcher = service.get_launcher()
                if fake_os == 'nt':
                    self.assertEqual(service.Launcher, type(launcher))
                else:
                    self.assertEqual(fake_process_launcher(), launcher)

    def test_process_launcher_on_windows(self):
        self._test_service_launcher('nt')

    def test_process_launcher_on_linux(self):
        self._test_service_launcher('posix')
