A Python agent for provisioning and deprovisioning Bare Metal servers.
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ironic-python-agent/ironic_python_agent/tests/unit/test_multi_hardware.py

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# Copyright 2013 Rackspace, Inc.
#
# 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.
import collections
from unittest import mock
from stevedore import extension
from ironic_python_agent import errors
from ironic_python_agent import hardware
from ironic_python_agent.tests.unit import base
def counted(fn):
def wrapper(self, *args, **kwargs):
try:
counts = self._call_counts
except AttributeError:
counts = self._call_counts = collections.Counter()
counts[fn.__name__] += 1
return fn(self, *args, **kwargs)
return wrapper
class FakeGenericHardwareManager(hardware.HardwareManager):
@counted
def generic_only(self):
return 'generic_only'
@counted
def generic_none(self):
return None
@counted
def specific_none(self):
return 'generic'
@counted
def return_list(self):
return ['generic']
@counted
def specific_only(self):
raise Exception("Test fail: This method should not be called")
@counted
def mainline_fail(self):
return 'generic_mainline_fail'
@counted
def both_succeed(self):
return 'generic_both'
@counted
def unexpected_fail(self):
raise Exception("Test fail: This method should not be called")
@counted
def evaluate_hardware_support(self):
return hardware.HardwareSupport.GENERIC
class FakeMainlineHardwareManager(hardware.HardwareManager):
@counted
def specific_only(self):
return 'specific_only'
@counted
def generic_none(self):
return 'specific'
@counted
def specific_none(self):
return None
@counted
def return_list(self):
return ['specific']
@counted
def mainline_fail(self):
raise errors.IncompatibleHardwareMethodError
@counted
def both_succeed(self):
return 'specific_both'
@counted
def unexpected_fail(self):
raise RuntimeError('A problem was encountered')
@counted
def evaluate_hardware_support(self):
return hardware.HardwareSupport.MAINLINE
class TestMultipleHardwareManagerLoading(base.IronicAgentTest):
def setUp(self):
super(TestMultipleHardwareManagerLoading, self).setUp()
fake_ep = mock.Mock()
fake_ep.module_name = 'fake'
fake_ep.attrs = ['fake attrs']
self.generic_hwm = extension.Extension(
'fake_generic', fake_ep, None, FakeGenericHardwareManager())
self.mainline_hwm = extension.Extension(
'fake_mainline', fake_ep, None, FakeMainlineHardwareManager())
self.fake_ext_mgr = extension.ExtensionManager.make_test_instance(
[self.generic_hwm, self.mainline_hwm])
self.extension_mgr_patcher = mock.patch('stevedore.ExtensionManager',
autospec=True)
self.addCleanup(self.extension_mgr_patcher.stop)
self.mocked_extension_mgr = self.extension_mgr_patcher.start()
self.mocked_extension_mgr.return_value = self.fake_ext_mgr
hardware._global_managers = None
def test_mainline_method_only(self):
hardware.dispatch_to_managers('specific_only')
self.assertEqual(
1, self.mainline_hwm.obj._call_counts['specific_only'])
def test_generic_method_only(self):
hardware.dispatch_to_managers('generic_only')
self.assertEqual(1, self.generic_hwm.obj._call_counts['generic_only'])
def test_both_succeed(self):
# In the case where both managers will work; only the most specific
# manager should have it's function called.
hardware.dispatch_to_managers('both_succeed')
self.assertEqual(1, self.mainline_hwm.obj._call_counts['both_succeed'])
self.assertEqual(0, self.generic_hwm.obj._call_counts['both_succeed'])
def test_mainline_fails(self):
# Ensure that if the mainline manager is unable to run the method
# that we properly fall back to generic.
hardware.dispatch_to_managers('mainline_fail')
self.assertEqual(
1, self.mainline_hwm.obj._call_counts['mainline_fail'])
self.assertEqual(1, self.generic_hwm.obj._call_counts['mainline_fail'])
def test_manager_method_not_found(self):
self.assertRaises(errors.HardwareManagerMethodNotFound,
hardware.dispatch_to_managers,
'fake_method')
def test_method_fails(self):
self.assertRaises(RuntimeError,
hardware.dispatch_to_managers,
'unexpected_fail')
def test_dispatch_to_all_managers_mainline_only(self):
results = hardware.dispatch_to_all_managers('generic_none')
self.assertEqual(1, self.generic_hwm.obj._call_counts['generic_none'])
self.assertEqual({'FakeGenericHardwareManager': None,
'FakeMainlineHardwareManager': 'specific'},
results)
def test_dispatch_to_all_managers_generic_method_only(self):
results = hardware.dispatch_to_all_managers('specific_none')
self.assertEqual(1, self.generic_hwm.obj._call_counts['specific_none'])
self.assertEqual({'FakeGenericHardwareManager': 'generic',
'FakeMainlineHardwareManager': None}, results)
def test_dispatch_to_all_managers_both_succeed(self):
# In the case where both managers will work; only the most specific
# manager should have it's function called.
results = hardware.dispatch_to_all_managers('both_succeed')
self.assertEqual({'FakeGenericHardwareManager': 'generic_both',
'FakeMainlineHardwareManager': 'specific_both'},
results)
self.assertEqual(1, self.mainline_hwm.obj._call_counts['both_succeed'])
self.assertEqual(1, self.generic_hwm.obj._call_counts['both_succeed'])
def test_dispatch_to_all_managers_mainline_fails(self):
# Ensure that if the mainline manager is unable to run the method
# that we properly fall back to generic.
hardware.dispatch_to_all_managers('mainline_fail')
self.assertEqual(
1, self.mainline_hwm.obj._call_counts['mainline_fail'])
self.assertEqual(1, self.generic_hwm.obj._call_counts['mainline_fail'])
def test_dispatch_to_all_managers_manager_method_not_found(self):
self.assertRaises(errors.HardwareManagerMethodNotFound,
hardware.dispatch_to_all_managers,
'unknown_method')
def test_dispatch_to_all_managers_method_fails(self):
self.assertRaises(RuntimeError,
hardware.dispatch_to_all_managers,
'unexpected_fail')
class TestNoHardwareManagerLoading(base.IronicAgentTest):
def setUp(self):
super(TestNoHardwareManagerLoading, self).setUp()
self.empty_ext_mgr = extension.ExtensionManager.make_test_instance([])
@mock.patch('stevedore.ExtensionManager', autospec=True)
def test_no_managers_found(self, mocked_extension_mgr_constructor):
mocked_extension_mgr_constructor.return_value = self.empty_ext_mgr
hardware._global_managers = None
self.assertRaises(errors.HardwareManagerNotFound,
hardware.dispatch_to_managers,
'some_method')