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# 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 nova import objects
from nova.scheduler.filters import num_instances_filter
from nova import test
from nova.tests.unit.scheduler import fakes
class TestNumInstancesFilter(test.NoDBTestCase):
def test_filter_num_instances_passes(self):
self.flags(max_instances_per_host=5, group='filter_scheduler')
self.filt_cls = num_instances_filter.NumInstancesFilter()
host = fakes.FakeHostState('host1', 'node1',
{'num_instances': 4})
spec_obj = objects.RequestSpec()
self.assertTrue(self.filt_cls.host_passes(host, spec_obj))
def test_filter_num_instances_fails(self):
self.flags(max_instances_per_host=5, group='filter_scheduler')
self.filt_cls = num_instances_filter.NumInstancesFilter()
host = fakes.FakeHostState('host1', 'node1',
{'num_instances': 5})
spec_obj = objects.RequestSpec()
self.assertFalse(self.filt_cls.host_passes(host, spec_obj))
@mock.patch('nova.scheduler.filters.utils.aggregate_values_from_key')
def test_filter_aggregate_num_instances_value(self, agg_mock):
self.flags(max_instances_per_host=4, group='filter_scheduler')
self.filt_cls = num_instances_filter.AggregateNumInstancesFilter()
host = fakes.FakeHostState('host1', 'node1',
{'num_instances': 5})
spec_obj = objects.RequestSpec(context=mock.sentinel.ctx)
agg_mock.return_value = set([])
# No aggregate defined for that host.
self.assertFalse(self.filt_cls.host_passes(host, spec_obj))
agg_mock.assert_called_once_with(host, 'max_instances_per_host')
agg_mock.return_value = set(['6'])
# Aggregate defined for that host.
self.assertTrue(self.filt_cls.host_passes(host, spec_obj))
@mock.patch('nova.scheduler.filters.utils.aggregate_values_from_key')
def test_filter_aggregate_num_instances_value_error(self, agg_mock):
self.flags(max_instances_per_host=6, group='filter_scheduler')
self.filt_cls = num_instances_filter.AggregateNumInstancesFilter()
host = fakes.FakeHostState('host1', 'node1', {})
spec_obj = objects.RequestSpec(context=mock.sentinel.ctx)
agg_mock.return_value = set(['XXX'])
self.assertTrue(self.filt_cls.host_passes(host, spec_obj))
agg_mock.assert_called_once_with(host, 'max_instances_per_host')
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