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# -*- coding: utf-8 -*-
# Copyright 2016 OpenMarket Ltd
#
# 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 logging
from synapse.api.errors import SynapseError
from synapse.util import logcontext
from synapse.util.caches import descriptors
from tests import unittest
logger = logging.getLogger(__name__)
def run_on_reactor():
d = defer.Deferred()
reactor.callLater(0, d.callback, 0)
return logcontext.make_deferred_yieldable(d)
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class CacheTestCase(unittest.TestCase):
def test_invalidate_all(self):
cache = descriptors.Cache("testcache")
callback_record = [False, False]
def record_callback(idx):
callback_record[idx] = True
# add a couple of pending entries
d1 = defer.Deferred()
cache.set("key1", d1, partial(record_callback, 0))
d2 = defer.Deferred()
cache.set("key2", d2, partial(record_callback, 1))
# lookup should return the deferreds
self.assertIs(cache.get("key1"), d1)
self.assertIs(cache.get("key2"), d2)
# let one of the lookups complete
d2.callback("result2")
self.assertEqual(cache.get("key2"), "result2")
# now do the invalidation
cache.invalidate_all()
# lookup should return none
self.assertIsNone(cache.get("key1", None))
self.assertIsNone(cache.get("key2", None))
# both callbacks should have been callbacked
self.assertTrue(
callback_record[0], "Invalidation callback for key1 not called",
)
self.assertTrue(
callback_record[1], "Invalidation callback for key2 not called",
)
# letting the other lookup complete should do nothing
d1.callback("result1")
self.assertIsNone(cache.get("key1", None))
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class DescriptorTestCase(unittest.TestCase):
@defer.inlineCallbacks
def test_cache(self):
class Cls(object):
def __init__(self):
self.mock = mock.Mock()
@descriptors.cached()
def fn(self, arg1, arg2):
return self.mock(arg1, arg2)
obj = Cls()
obj.mock.return_value = 'fish'
r = yield obj.fn(1, 2)
self.assertEqual(r, 'fish')
obj.mock.assert_called_once_with(1, 2)
obj.mock.reset_mock()
# a call with different params should call the mock again
obj.mock.return_value = 'chips'
r = yield obj.fn(1, 3)
self.assertEqual(r, 'chips')
obj.mock.assert_called_once_with(1, 3)
obj.mock.reset_mock()
# the two values should now be cached
r = yield obj.fn(1, 2)
self.assertEqual(r, 'fish')
r = yield obj.fn(1, 3)
self.assertEqual(r, 'chips')
obj.mock.assert_not_called()
@defer.inlineCallbacks
def test_cache_num_args(self):
"""Only the first num_args arguments should matter to the cache"""
class Cls(object):
def __init__(self):
self.mock = mock.Mock()
@descriptors.cached(num_args=1)
def fn(self, arg1, arg2):
return self.mock(arg1, arg2)
obj = Cls()
obj.mock.return_value = 'fish'
r = yield obj.fn(1, 2)
self.assertEqual(r, 'fish')
obj.mock.assert_called_once_with(1, 2)
obj.mock.reset_mock()
# a call with different params should call the mock again
obj.mock.return_value = 'chips'
r = yield obj.fn(2, 3)
self.assertEqual(r, 'chips')
obj.mock.assert_called_once_with(2, 3)
obj.mock.reset_mock()
# the two values should now be cached; we should be able to vary
# the second argument and still get the cached result.
r = yield obj.fn(1, 4)
self.assertEqual(r, 'fish')
r = yield obj.fn(2, 5)
self.assertEqual(r, 'chips')
obj.mock.assert_not_called()
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def test_cache_logcontexts(self):
"""Check that logcontexts are set and restored correctly when
using the cache."""
complete_lookup = defer.Deferred()
class Cls(object):
@descriptors.cached()
def fn(self, arg1):
@defer.inlineCallbacks
def inner_fn():
with logcontext.PreserveLoggingContext():
yield complete_lookup
defer.returnValue(1)
return inner_fn()
@defer.inlineCallbacks
def do_lookup():
with logcontext.LoggingContext() as c1:
c1.name = "c1"
r = yield obj.fn(1)
self.assertEqual(logcontext.LoggingContext.current_context(),
c1)
defer.returnValue(r)
def check_result(r):
self.assertEqual(r, 1)
obj = Cls()
# set off a deferred which will do a cache lookup
d1 = do_lookup()
self.assertEqual(logcontext.LoggingContext.current_context(),
logcontext.LoggingContext.sentinel)
d1.addCallback(check_result)
# and another
d2 = do_lookup()
self.assertEqual(logcontext.LoggingContext.current_context(),
logcontext.LoggingContext.sentinel)
d2.addCallback(check_result)
# let the lookup complete
complete_lookup.callback(None)
return defer.gatherResults([d1, d2])
def test_cache_logcontexts_with_exception(self):
"""Check that the cache sets and restores logcontexts correctly when
the lookup function throws an exception"""
class Cls(object):
@descriptors.cached()
def fn(self, arg1):
@defer.inlineCallbacks
def inner_fn():
# we want this to behave like an asynchronous function
yield run_on_reactor()
raise SynapseError(400, "blah")
return inner_fn()
@defer.inlineCallbacks
def do_lookup():
with logcontext.LoggingContext() as c1:
c1.name = "c1"
try:
d = obj.fn(1)
self.assertEqual(
logcontext.LoggingContext.current_context(),
logcontext.LoggingContext.sentinel,
)
yield d
self.fail("No exception thrown")
except SynapseError:
pass
self.assertEqual(logcontext.LoggingContext.current_context(),
c1)
obj = Cls()
# set off a deferred which will do a cache lookup
d1 = do_lookup()
self.assertEqual(logcontext.LoggingContext.current_context(),
logcontext.LoggingContext.sentinel)
return d1
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@defer.inlineCallbacks
def test_cache_default_args(self):
class Cls(object):
def __init__(self):
self.mock = mock.Mock()
@descriptors.cached()
def fn(self, arg1, arg2=2, arg3=3):
return self.mock(arg1, arg2, arg3)
obj = Cls()
obj.mock.return_value = 'fish'
r = yield obj.fn(1, 2, 3)
self.assertEqual(r, 'fish')
obj.mock.assert_called_once_with(1, 2, 3)
obj.mock.reset_mock()
# a call with same params shouldn't call the mock again
r = yield obj.fn(1, 2)
self.assertEqual(r, 'fish')
obj.mock.assert_not_called()
obj.mock.reset_mock()
# a call with different params should call the mock again
obj.mock.return_value = 'chips'
r = yield obj.fn(2, 3)
self.assertEqual(r, 'chips')
obj.mock.assert_called_once_with(2, 3, 3)
obj.mock.reset_mock()
# the two values should now be cached
r = yield obj.fn(1, 2)
self.assertEqual(r, 'fish')
r = yield obj.fn(2, 3)
self.assertEqual(r, 'chips')
obj.mock.assert_not_called()