247 lines
9.7 KiB
Python
247 lines
9.7 KiB
Python
# Copyright 2013 Metacloud
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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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import copy
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from dogpile.cache import api
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from dogpile.cache import proxy
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from keystone.common import cache
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from keystone import config
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from keystone import exception
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from keystone.tests import unit as tests
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CONF = config.CONF
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NO_VALUE = api.NO_VALUE
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def _copy_value(value):
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if value is not NO_VALUE:
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value = copy.deepcopy(value)
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return value
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# NOTE(morganfainberg): WARNING - It is not recommended to use the Memory
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# backend for dogpile.cache in a real deployment under any circumstances. The
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# backend does no cleanup of expired values and therefore will leak memory. The
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# backend is not implemented in a way to share data across processes (e.g.
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# Keystone in HTTPD. This proxy is a hack to get around the lack of isolation
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# of values in memory. Currently it blindly stores and retrieves the values
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# from the cache, and modifications to dicts/lists/etc returned can result in
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# changes to the cached values. In short, do not use the dogpile.cache.memory
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# backend unless you are running tests or expecting odd/strange results.
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class CacheIsolatingProxy(proxy.ProxyBackend):
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"""Proxy that forces a memory copy of stored values.
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The default in-memory cache-region does not perform a copy on values it
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is meant to cache. Therefore if the value is modified after set or after
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get, the cached value also is modified. This proxy does a copy as the last
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thing before storing data.
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"""
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def get(self, key):
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return _copy_value(self.proxied.get(key))
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def set(self, key, value):
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self.proxied.set(key, _copy_value(value))
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class TestProxy(proxy.ProxyBackend):
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def get(self, key):
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value = _copy_value(self.proxied.get(key))
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if value is not NO_VALUE:
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if isinstance(value[0], TestProxyValue):
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value[0].cached = True
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return value
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class TestProxyValue(object):
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def __init__(self, value):
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self.value = value
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self.cached = False
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class CacheRegionTest(tests.TestCase):
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def setUp(self):
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super(CacheRegionTest, self).setUp()
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self.region = cache.make_region()
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cache.configure_cache_region(self.region)
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self.region.wrap(TestProxy)
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self.test_value = TestProxyValue('Decorator Test')
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def _add_test_caching_option(self):
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self.config_fixture.register_opt(
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config.config.cfg.BoolOpt('caching', default=True), group='cache')
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def _get_cacheable_function(self):
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SHOULD_CACHE_FN = cache.should_cache_fn('cache')
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@self.region.cache_on_arguments(should_cache_fn=SHOULD_CACHE_FN)
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def cacheable_function(value):
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return value
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return cacheable_function
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def test_region_built_with_proxy_direct_cache_test(self):
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# Verify cache regions are properly built with proxies.
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test_value = TestProxyValue('Direct Cache Test')
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self.region.set('cache_test', test_value)
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cached_value = self.region.get('cache_test')
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self.assertTrue(cached_value.cached)
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def test_cache_region_no_error_multiple_config(self):
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# Verify configuring the CacheRegion again doesn't error.
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cache.configure_cache_region(self.region)
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cache.configure_cache_region(self.region)
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def test_should_cache_fn_global_cache_enabled(self):
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# Verify should_cache_fn generates a sane function for subsystem and
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# functions as expected with caching globally enabled.
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cacheable_function = self._get_cacheable_function()
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self.config_fixture.config(group='cache', enabled=True)
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cacheable_function(self.test_value)
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cached_value = cacheable_function(self.test_value)
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self.assertTrue(cached_value.cached)
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def test_should_cache_fn_global_cache_disabled(self):
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# Verify should_cache_fn generates a sane function for subsystem and
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# functions as expected with caching globally disabled.
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cacheable_function = self._get_cacheable_function()
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self.config_fixture.config(group='cache', enabled=False)
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cacheable_function(self.test_value)
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cached_value = cacheable_function(self.test_value)
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self.assertFalse(cached_value.cached)
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def test_should_cache_fn_global_cache_disabled_section_cache_enabled(self):
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# Verify should_cache_fn generates a sane function for subsystem and
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# functions as expected with caching globally disabled and the specific
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# section caching enabled.
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cacheable_function = self._get_cacheable_function()
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self._add_test_caching_option()
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self.config_fixture.config(group='cache', enabled=False)
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self.config_fixture.config(group='cache', caching=True)
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cacheable_function(self.test_value)
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cached_value = cacheable_function(self.test_value)
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self.assertFalse(cached_value.cached)
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def test_should_cache_fn_global_cache_enabled_section_cache_disabled(self):
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# Verify should_cache_fn generates a sane function for subsystem and
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# functions as expected with caching globally enabled and the specific
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# section caching disabled.
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cacheable_function = self._get_cacheable_function()
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self._add_test_caching_option()
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self.config_fixture.config(group='cache', enabled=True)
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self.config_fixture.config(group='cache', caching=False)
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cacheable_function(self.test_value)
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cached_value = cacheable_function(self.test_value)
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self.assertFalse(cached_value.cached)
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def test_should_cache_fn_global_cache_enabled_section_cache_enabled(self):
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# Verify should_cache_fn generates a sane function for subsystem and
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# functions as expected with caching globally enabled and the specific
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# section caching enabled.
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cacheable_function = self._get_cacheable_function()
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self._add_test_caching_option()
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self.config_fixture.config(group='cache', enabled=True)
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self.config_fixture.config(group='cache', caching=True)
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cacheable_function(self.test_value)
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cached_value = cacheable_function(self.test_value)
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self.assertTrue(cached_value.cached)
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def test_cache_dictionary_config_builder(self):
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"""Validate we build a sane dogpile.cache dictionary config."""
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self.config_fixture.config(group='cache',
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config_prefix='test_prefix',
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backend='some_test_backend',
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expiration_time=86400,
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backend_argument=['arg1:test',
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'arg2:test:test',
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'arg3.invalid'])
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config_dict = cache.build_cache_config()
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self.assertEqual(
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CONF.cache.backend, config_dict['test_prefix.backend'])
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self.assertEqual(
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CONF.cache.expiration_time,
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config_dict['test_prefix.expiration_time'])
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self.assertEqual('test', config_dict['test_prefix.arguments.arg1'])
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self.assertEqual('test:test',
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config_dict['test_prefix.arguments.arg2'])
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self.assertNotIn('test_prefix.arguments.arg3', config_dict)
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def test_cache_debug_proxy(self):
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single_value = 'Test Value'
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single_key = 'testkey'
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multi_values = {'key1': 1, 'key2': 2, 'key3': 3}
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self.region.set(single_key, single_value)
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self.assertEqual(single_value, self.region.get(single_key))
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self.region.delete(single_key)
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self.assertEqual(NO_VALUE, self.region.get(single_key))
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self.region.set_multi(multi_values)
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cached_values = self.region.get_multi(multi_values.keys())
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for value in multi_values.values():
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self.assertIn(value, cached_values)
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self.assertEqual(len(multi_values.values()), len(cached_values))
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self.region.delete_multi(multi_values.keys())
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for value in self.region.get_multi(multi_values.keys()):
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self.assertEqual(NO_VALUE, value)
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def test_configure_non_region_object_raises_error(self):
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self.assertRaises(exception.ValidationError,
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cache.configure_cache_region,
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"bogus")
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class CacheNoopBackendTest(tests.TestCase):
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def setUp(self):
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super(CacheNoopBackendTest, self).setUp()
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self.region = cache.make_region()
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cache.configure_cache_region(self.region)
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def config_overrides(self):
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super(CacheNoopBackendTest, self).config_overrides()
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self.config_fixture.config(group='cache',
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backend='keystone.common.cache.noop')
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def test_noop_backend(self):
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single_value = 'Test Value'
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single_key = 'testkey'
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multi_values = {'key1': 1, 'key2': 2, 'key3': 3}
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self.region.set(single_key, single_value)
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self.assertEqual(NO_VALUE, self.region.get(single_key))
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self.region.set_multi(multi_values)
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cached_values = self.region.get_multi(multi_values.keys())
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self.assertEqual(len(cached_values), len(multi_values.values()))
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for value in cached_values:
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self.assertEqual(NO_VALUE, value)
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# Delete should not raise exceptions
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self.region.delete(single_key)
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self.region.delete_multi(multi_values.keys())
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