272 lines
8.8 KiB
Python
272 lines
8.8 KiB
Python
# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Tests for the compute extra resources framework."""
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from oslo_config import cfg
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from stevedore import extension
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from stevedore import named
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from nova.compute import resources
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from nova.compute.resources import base
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from nova import context
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from nova.objects import flavor as flavor_obj
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from nova import test
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CONF = cfg.CONF
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class FakeResourceHandler(resources.ResourceHandler):
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def __init__(self, extensions):
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self._mgr = \
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named.NamedExtensionManager.make_test_instance(extensions)
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class FakeResource(base.Resource):
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def __init__(self):
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self.total_res = 0
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self.used_res = 0
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def _get_requested(self, usage):
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if 'extra_specs' not in usage:
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return
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if self.resource_name not in usage['extra_specs']:
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return
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req = usage['extra_specs'][self.resource_name]
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return int(req)
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def _get_limit(self, limits):
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if self.resource_name not in limits:
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return
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limit = limits[self.resource_name]
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return int(limit)
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def reset(self, resources, driver):
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self.total_res = 0
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self.used_res = 0
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def test(self, usage, limits):
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requested = self._get_requested(usage)
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if not requested:
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return
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limit = self._get_limit(limits)
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if not limit:
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return
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free = limit - self.used_res
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if requested <= free:
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return
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else:
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return ('Free %(free)d < requested %(requested)d ' %
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{'free': free, 'requested': requested})
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def add_instance(self, usage):
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requested = self._get_requested(usage)
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if requested:
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self.used_res += requested
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def remove_instance(self, usage):
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requested = self._get_requested(usage)
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if requested:
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self.used_res -= requested
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def write(self, resources):
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pass
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def report_free(self):
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return "Free %s" % (self.total_res - self.used_res)
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class ResourceA(FakeResource):
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def reset(self, resources, driver):
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# ResourceA uses a configuration option
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self.total_res = int(CONF.resA)
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self.used_res = 0
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self.resource_name = 'resource:resA'
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def write(self, resources):
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resources['resA'] = self.total_res
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resources['used_resA'] = self.used_res
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class ResourceB(FakeResource):
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def reset(self, resources, driver):
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# ResourceB uses resource details passed in parameter resources
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self.total_res = resources['resB']
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self.used_res = 0
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self.resource_name = 'resource:resB'
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def write(self, resources):
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resources['resB'] = self.total_res
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resources['used_resB'] = self.used_res
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def fake_flavor_obj(**updates):
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flavor = flavor_obj.Flavor()
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flavor.id = 1
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flavor.name = 'fakeflavor'
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flavor.memory_mb = 8000
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flavor.vcpus = 3
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flavor.root_gb = 11
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flavor.ephemeral_gb = 4
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flavor.swap = 0
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flavor.rxtx_factor = 1.0
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flavor.vcpu_weight = 1
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if updates:
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flavor.update(updates)
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return flavor
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class BaseTestCase(test.NoDBTestCase):
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def _initialize_used_res_counter(self):
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# Initialize the value for the used resource
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for ext in self.r_handler._mgr.extensions:
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ext.obj.used_res = 0
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def setUp(self):
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super(BaseTestCase, self).setUp()
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# initialize flavors and stub get_by_id to
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# get flavors from here
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self._flavors = {}
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self.ctxt = context.get_admin_context()
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# Create a flavor without extra_specs defined
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_flavor_id = 1
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_flavor = fake_flavor_obj(id=_flavor_id)
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self._flavors[_flavor_id] = _flavor
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# Create a flavor with extra_specs defined
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_flavor_id = 2
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requested_resA = 5
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requested_resB = 7
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requested_resC = 7
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_extra_specs = {'resource:resA': requested_resA,
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'resource:resB': requested_resB,
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'resource:resC': requested_resC}
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_flavor = fake_flavor_obj(id=_flavor_id,
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extra_specs=_extra_specs)
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self._flavors[_flavor_id] = _flavor
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# create fake resource extensions and resource handler
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_extensions = [
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extension.Extension('resA', None, ResourceA, ResourceA()),
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extension.Extension('resB', None, ResourceB, ResourceB()),
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]
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self.r_handler = FakeResourceHandler(_extensions)
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# Resources details can be passed to each plugin or can be specified as
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# configuration options
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driver_resources = {'resB': 5}
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CONF.resA = '10'
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# initialise the resources
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self.r_handler.reset_resources(driver_resources, None)
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def test_update_from_instance_with_extra_specs(self):
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# Flavor with extra_specs
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_flavor_id = 2
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sign = 1
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self.r_handler.update_from_instance(self._flavors[_flavor_id], sign)
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expected_resA = self._flavors[_flavor_id].extra_specs['resource:resA']
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expected_resB = self._flavors[_flavor_id].extra_specs['resource:resB']
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self.assertEqual(int(expected_resA),
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self.r_handler._mgr['resA'].obj.used_res)
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self.assertEqual(int(expected_resB),
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self.r_handler._mgr['resB'].obj.used_res)
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def test_update_from_instance_without_extra_specs(self):
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# Flavor id without extra spec
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_flavor_id = 1
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self._initialize_used_res_counter()
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self.r_handler.resource_list = []
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sign = 1
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self.r_handler.update_from_instance(self._flavors[_flavor_id], sign)
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self.assertEqual(0, self.r_handler._mgr['resA'].obj.used_res)
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self.assertEqual(0, self.r_handler._mgr['resB'].obj.used_res)
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def test_write_resources(self):
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self._initialize_used_res_counter()
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extra_resources = {}
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expected = {'resA': 10, 'used_resA': 0, 'resB': 5, 'used_resB': 0}
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self.r_handler.write_resources(extra_resources)
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self.assertEqual(expected, extra_resources)
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def test_test_resources_without_extra_specs(self):
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limits = {}
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# Flavor id without extra_specs
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flavor = self._flavors[1]
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result = self.r_handler.test_resources(flavor, limits)
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self.assertEqual([None, None], result)
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def test_test_resources_with_limits_for_different_resource(self):
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limits = {'resource:resC': 20}
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# Flavor id with extra_specs
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flavor = self._flavors[2]
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result = self.r_handler.test_resources(flavor, limits)
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self.assertEqual([None, None], result)
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def test_passing_test_resources(self):
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limits = {'resource:resA': 10, 'resource:resB': 20}
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# Flavor id with extra_specs
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flavor = self._flavors[2]
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self._initialize_used_res_counter()
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result = self.r_handler.test_resources(flavor, limits)
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self.assertEqual([None, None], result)
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def test_failing_test_resources_for_single_resource(self):
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limits = {'resource:resA': 4, 'resource:resB': 20}
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# Flavor id with extra_specs
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flavor = self._flavors[2]
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self._initialize_used_res_counter()
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result = self.r_handler.test_resources(flavor, limits)
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expected = ['Free 4 < requested 5 ', None]
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self.assertEqual(sorted(expected),
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sorted(result))
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def test_empty_resource_handler(self):
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"""An empty resource handler has no resource extensions,
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should have no effect, and should raise no exceptions.
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"""
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empty_r_handler = FakeResourceHandler([])
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resources = {}
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empty_r_handler.reset_resources(resources, None)
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flavor = self._flavors[1]
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sign = 1
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empty_r_handler.update_from_instance(flavor, sign)
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limits = {}
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test_result = empty_r_handler.test_resources(flavor, limits)
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self.assertEqual([], test_result)
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sign = -1
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empty_r_handler.update_from_instance(flavor, sign)
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extra_resources = {}
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expected_extra_resources = extra_resources
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empty_r_handler.write_resources(extra_resources)
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self.assertEqual(expected_extra_resources, extra_resources)
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empty_r_handler.report_free_resources()
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