# Copyright 2015 Mirantis 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.

from unittest import mock

from neutron_lib.callbacks import events
from neutron_lib.callbacks import registry
from neutron_lib.callbacks import resources
from oslo_concurrency import processutils
from oslo_config import cfg

from neutron import service
from neutron.tests import base
from neutron.tests.unit import test_wsgi


class TestServiceHelpers(base.BaseTestCase):

    def test_get_workers(self):
        num_workers = service._get_worker_count()
        self.assertGreaterEqual(num_workers, 1)
        self.assertLessEqual(num_workers, processutils.get_worker_count())


class TestRpcWorker(test_wsgi.TestServiceBase):

    def test_reset(self):
        _plugin = mock.Mock()
        rpc_worker = service.RpcWorker(_plugin)
        self._test_reset(rpc_worker)


class TestRunRpcWorkers(base.BaseTestCase):
    def setUp(self):
        super(TestRunRpcWorkers, self).setUp()
        self.worker_count = service._get_worker_count()

    def _test_rpc_workers(self, config_value, expected_passed_value):
        if config_value is not None:
            cfg.CONF.set_override('rpc_workers', config_value)
        with mock.patch('neutron.service.RpcWorker') as mock_rpc_worker:
            with mock.patch('neutron.service.RpcReportsWorker'):
                service._get_rpc_workers(plugin=mock.Mock())
        init_call = mock_rpc_worker.call_args
        expected_call = mock.call(
            mock.ANY, worker_process_count=expected_passed_value)
        self.assertEqual(expected_call, init_call)

    def test_rpc_workers_zero(self):
        self._test_rpc_workers(0, 1)

    def test_rpc_workers_default_api_workers_default(self):
        workers = max(int(self.worker_count / 2), 1)
        self._test_rpc_workers(None, workers)

    def test_rpc_workers_default_api_workers_set(self):
        cfg.CONF.set_override('api_workers', 18)
        self._test_rpc_workers(None, 9)

    def test_rpc_workers_defined(self):
        self._test_rpc_workers(42, 42)


class TestRunWsgiApp(base.BaseTestCase):
    def setUp(self):
        super(TestRunWsgiApp, self).setUp()
        self.worker_count = service._get_worker_count()

    def _test_api_workers(self, config_value, expected_passed_value):
        if config_value is not None:
            cfg.CONF.set_override('api_workers', config_value)
        with mock.patch('neutron.wsgi.Server') as mock_server:
            service.run_wsgi_app(mock.sentinel.app)
        start_call = mock_server.return_value.start.call_args
        expected_call = mock.call(
            mock.ANY, mock.ANY, mock.ANY, desc='api worker',
            workers=expected_passed_value)
        self.assertEqual(expected_call, start_call)

    def test_api_workers_zero(self):
        self._test_api_workers(0, 0)

    def test_api_workers_default(self):
        self._test_api_workers(None, self.worker_count)

    def test_api_workers_defined(self):
        self._test_api_workers(42, 42)

    def test_start_all_workers(self):
        cfg.CONF.set_override('api_workers', 0)
        mock.patch.object(service, '_get_rpc_workers').start()
        mock.patch.object(service, '_get_plugins_workers').start()
        mock.patch.object(service, '_start_workers').start()

        callback = mock.Mock()
        registry.subscribe(callback, resources.PROCESS, events.AFTER_SPAWN)
        service.start_all_workers()
        callback.assert_called_once_with(
            resources.PROCESS, events.AFTER_SPAWN, mock.ANY, payload=None)
