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# Copyright (c) 2012 OpenStack Foundation
# 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.
"""Tests for hook customization."""
import stevedore
from nova import hooks
from nova import test
class SampleHookA(object):
name = "a"
def _add_called(self, op, kwargs):
called = kwargs.get('called', None)
if called is not None:
called.append(op + self.name)
def pre(self, *args, **kwargs):
self._add_called("pre", kwargs)
class SampleHookB(SampleHookA):
name = "b"
def post(self, rv, *args, **kwargs):
self._add_called("post", kwargs)
class SampleHookC(SampleHookA):
name = "c"
def pre(self, f, *args, **kwargs):
self._add_called("pre" + f.__name__, kwargs)
def post(self, f, rv, *args, **kwargs):
self._add_called("post" + f.__name__, kwargs)
class MockEntryPoint(object):
def __init__(self, cls):
self.cls = cls
def load(self):
return self.cls
class HookTestCase(test.NoDBTestCase):
def _mock_load_plugins(self, iload, *iargs, **ikwargs):
return [
stevedore.extension.Extension('test_hook',
MockEntryPoint(SampleHookA), SampleHookA, SampleHookA()),
stevedore.extension.Extension('test_hook',
MockEntryPoint(SampleHookB), SampleHookB, SampleHookB()),
]
def setUp(self):
super(HookTestCase, self).setUp()
hooks.reset()
self.stubs.Set(stevedore.extension.ExtensionManager, '_load_plugins',
self._mock_load_plugins)
@hooks.add_hook('test_hook')
def _hooked(self, a, b=1, c=2, called=None):
return 42
def test_basic(self):
self.assertEqual(42, self._hooked(1))
mgr = hooks._HOOKS['test_hook']
self.assertEqual(2, len(mgr.extensions))
self.assertEqual(SampleHookA, mgr.extensions[0].plugin)
self.assertEqual(SampleHookB, mgr.extensions[1].plugin)
def test_order_of_execution(self):
called_order = []
self._hooked(42, called=called_order)
self.assertEqual(['prea', 'preb', 'postb'], called_order)
class HookTestCaseWithFunction(HookTestCase):
def _mock_load_plugins(self, iload, *iargs, **ikwargs):
return [
stevedore.extension.Extension('function_hook',
MockEntryPoint(SampleHookC), SampleHookC, SampleHookC()),
]
@hooks.add_hook('function_hook', pass_function=True)
def _hooked(self, a, b=1, c=2, called=None):
return 42
def test_basic(self):
self.assertEqual(42, self._hooked(1))
mgr = hooks._HOOKS['function_hook']
self.assertEqual(1, len(mgr.extensions))
self.assertEqual(SampleHookC, mgr.extensions[0].plugin)
def test_order_of_execution(self):
called_order = []
self._hooked(42, called=called_order)
self.assertEqual(['pre_hookedc', 'post_hookedc'], called_order)
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