trivial: Remove FakeScheduler

We don't need this and it's blocking us from removing pluggable
scheduler drivers. Remove it.

Change-Id: I61c1a47559645c41089747cc81270848b58b68f9
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

nova/conf/scheduler.py

@@ -32,20 +32,15 @@ of the entrypoints under the namespace 'nova.scheduler.driver' of file
 'setup.cfg'. If nothing is specified in this option, the 'filter_scheduler' is
 used.
 
-Other options are:
-
-* 'fake_scheduler' which is used for testing.
-
 Possible values:
 
 * Any of the drivers included in Nova:
 
   * filter_scheduler
-  * fake_scheduler
 
 * You may also set this to the entry point name of a custom scheduler driver,
-  but you will be responsible for creating and maintaining it in your setup.cfg
-  file.
+  but you will be responsible for creating and maintaining it in your
+  ``setup.cfg`` file.
 
 Related options:
 

nova/scheduler/manager.py

@@ -55,16 +55,17 @@ class SchedulerManager(manager.Manager):
 
     _sentinel = object()
 
-    def __init__(self, scheduler_driver=None, *args, **kwargs):
+    def __init__(self, *args, **kwargs):
         self.placement_client = report.SchedulerReportClient()
-        if not scheduler_driver:
-            scheduler_driver = CONF.scheduler.driver
         self.driver = driver.DriverManager(
-                "nova.scheduler.driver",
-                scheduler_driver,
-                invoke_on_load=True).driver
-        super(SchedulerManager, self).__init__(service_name='scheduler',
-                                               *args, **kwargs)
+            'nova.scheduler.driver',
+            CONF.scheduler.driver,
+            invoke_on_load=True
+        ).driver
+
+        super(SchedulerManager, self).__init__(
+            service_name='scheduler', *args, **kwargs
+        )
 
     @periodic_task.periodic_task(
         spacing=CONF.scheduler.discover_hosts_in_cells_interval,

nova/tests/unit/cmd/test_scheduler.py

@@ -46,16 +46,3 @@ class TestScheduler(test.NoDBTestCase):
         mock_serve.assert_called_once_with(
             service_create.return_value, workers=4)
         mock_wait.assert_called_once_with()
-
-    @mock.patch('nova.service.Service.create')
-    @mock.patch('nova.service.serve')
-    @mock.patch('nova.service.wait')
-    @mock.patch('oslo_concurrency.processutils.get_worker_count')
-    def test_workers_fake_scheduler(self, get_worker_count, mock_wait,
-                                    mock_serve, service_create):
-        self.flags(driver='fake_scheduler', group='scheduler')
-        scheduler.main()
-        get_worker_count.assert_not_called()
-        mock_serve.assert_called_once_with(
-            service_create.return_value, workers=1)
-        mock_wait.assert_called_once_with()

nova/tests/unit/scheduler/test_filter_scheduler.py

@@ -20,14 +20,15 @@ import mock
 from oslo_serialization import jsonutils
 from oslo_utils.fixture import uuidsentinel as uuids
 
+from nova import context
 from nova import exception
 from nova import objects
 from nova.scheduler import filter_scheduler
 from nova.scheduler import host_manager
 from nova.scheduler import utils as scheduler_utils
 from nova.scheduler import weights
+from nova import servicegroup
 from nova import test  # noqa
-from nova.tests.unit.scheduler import test_scheduler
 
 
 fake_numa_limit = objects.NUMATopologyLimits(cpu_allocation_ratio=1.0,
@@ -50,18 +51,41 @@ fake_selection = objects.Selection(service_host="fake_host",
         allocation_request_version=fake_alloc_version)
 
 
-class FilterSchedulerTestCase(test_scheduler.SchedulerTestCase):
+class FilterSchedulerTestCase(test.NoDBTestCase):
     """Test case for Filter Scheduler."""
 
-    driver_cls = filter_scheduler.FilterScheduler
-
+    @mock.patch.object(host_manager.HostManager, '_init_instance_info',
+                       new=mock.Mock())
+    @mock.patch.object(host_manager.HostManager, '_init_aggregates',
+                       new=mock.Mock())
+    @mock.patch('nova.scheduler.client.report.SchedulerReportClient',
+                autospec=True, new=mock.Mock())
+    @mock.patch('nova.scheduler.client.query.SchedulerQueryClient',
+                autospec=True, new=mock.Mock())
     def setUp(self):
-        with mock.patch(
-                'nova.scheduler.client.report.SchedulerReportClient',
-                autospec=True), mock.patch(
-                'nova.scheduler.client.query.SchedulerQueryClient',
-                autospec=True):
-            super(FilterSchedulerTestCase, self).setUp()
+        super(FilterSchedulerTestCase, self).setUp()
+
+        self.driver = filter_scheduler.FilterScheduler()
+        self.context = context.RequestContext('fake_user', 'fake_project')
+        self.topic = 'fake_topic'
+        self.servicegroup_api = servicegroup.API()
+
+    @mock.patch('nova.objects.ServiceList.get_by_topic')
+    @mock.patch('nova.servicegroup.API.service_is_up')
+    def test_hosts_up(self, mock_service_is_up, mock_get_by_topic):
+        service1 = objects.Service(host='host1')
+        service2 = objects.Service(host='host2')
+        services = objects.ServiceList(objects=[service1, service2])
+
+        mock_get_by_topic.return_value = services
+        mock_service_is_up.side_effect = [False, True]
+
+        result = self.driver.hosts_up(self.context, self.topic)
+        self.assertEqual(result, ['host2'])
+
+        mock_get_by_topic.assert_called_once_with(self.context, self.topic)
+        calls = [mock.call(service1), mock.call(service2)]
+        self.assertEqual(calls, mock_service_is_up.call_args_list)
 
     @mock.patch('nova.scheduler.utils.claim_resources')
     @mock.patch('nova.scheduler.filter_scheduler.FilterScheduler.'

nova/tests/unit/scheduler/test_manager.py

@@ -27,7 +27,6 @@ from nova import objects
 from nova.scheduler import filter_scheduler
 from nova.scheduler import host_manager
 from nova.scheduler import manager
-from nova import servicegroup
 from nova import test
 from nova.tests.unit import fake_server_actions
 from nova.tests.unit.scheduler import fakes
@@ -60,14 +59,11 @@ class SchedulerManagerTestCase(test.NoDBTestCase):
     """Test case for scheduler manager."""
 
     manager_cls = manager.SchedulerManager
-    driver_cls = fakes.FakeScheduler
-    driver_plugin_name = 'fake_scheduler'
 
     @mock.patch.object(host_manager.HostManager, '_init_instance_info')
     @mock.patch.object(host_manager.HostManager, '_init_aggregates')
     def setUp(self, mock_init_agg, mock_init_inst):
         super(SchedulerManagerTestCase, self).setUp()
-        self.flags(driver=self.driver_plugin_name, group='scheduler')
         self.manager = self.manager_cls()
         self.context = context.RequestContext('fake_user', 'fake_project')
         self.topic = 'fake_topic'
@@ -75,11 +71,6 @@ class SchedulerManagerTestCase(test.NoDBTestCase):
         self.fake_kwargs = {'cat': 'meow', 'dog': 'woof'}
         fake_server_actions.stub_out_action_events(self)
 
-    def test_1_correct_init(self):
-        # Correct scheduler driver
-        manager = self.manager
-        self.assertIsInstance(manager.driver, self.driver_cls)
-
     @mock.patch('nova.scheduler.request_filter.process_reqspec')
     @mock.patch('nova.scheduler.utils.resources_from_request_spec')
     @mock.patch('nova.scheduler.client.report.SchedulerReportClient.'
@@ -448,36 +439,3 @@ class SchedulerManagerTestCase(test.NoDBTestCase):
         self.manager._discover_hosts_in_cells(mock.sentinel.context)
         mock_log_warning.assert_not_called()
         mock_log_debug.assert_called_once_with(msg)
-
-
-class SchedulerTestCase(test.NoDBTestCase):
-    """Test case for base scheduler driver class."""
-
-    # So we can subclass this test and re-use tests if we need.
-    driver_cls = fakes.FakeScheduler
-
-    @mock.patch.object(host_manager.HostManager, '_init_instance_info')
-    @mock.patch.object(host_manager.HostManager, '_init_aggregates')
-    def setUp(self, mock_init_agg, mock_init_inst):
-        super(SchedulerTestCase, self).setUp()
-        self.driver = self.driver_cls()
-        self.context = context.RequestContext('fake_user', 'fake_project')
-        self.topic = 'fake_topic'
-        self.servicegroup_api = servicegroup.API()
-
-    @mock.patch('nova.objects.ServiceList.get_by_topic')
-    @mock.patch('nova.servicegroup.API.service_is_up')
-    def test_hosts_up(self, mock_service_is_up, mock_get_by_topic):
-        service1 = objects.Service(host='host1')
-        service2 = objects.Service(host='host2')
-        services = objects.ServiceList(objects=[service1, service2])
-
-        mock_get_by_topic.return_value = services
-        mock_service_is_up.side_effect = [False, True]
-
-        result = self.driver.hosts_up(self.context, self.topic)
-        self.assertEqual(result, ['host2'])
-
-        mock_get_by_topic.assert_called_once_with(self.context, self.topic)
-        calls = [mock.call(service1), mock.call(service2)]
-        self.assertEqual(calls, mock_service_is_up.call_args_list)

setup.cfg

@@ -50,7 +50,6 @@ nova.compute.monitors.cpu =
     virt_driver = nova.compute.monitors.cpu.virt_driver:Monitor
 nova.scheduler.driver =
     filter_scheduler = nova.scheduler.filter_scheduler:FilterScheduler
-    fake_scheduler = nova.tests.unit.scheduler.fakes:FakeScheduler
 console_scripts =
     nova-api = nova.cmd.api:main
     nova-api-metadata = nova.cmd.api_metadata:main