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# -*- coding: utf-8 -*-
# Copyright 2015, 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.
from mock import Mock
from twisted.internet import defer
from synapse.util.async_helpers import ObservableDeferred
from synapse.util.caches.descriptors import Cache, cached
from tests import unittest
class CacheTestCase(unittest.TestCase):
def setUp(self):
self.cache = Cache("test")
def test_empty(self):
failed = False
try:
self.cache.get("foo")
except KeyError:
failed = True
self.assertTrue(failed)
def test_hit(self):
self.cache.prefill("foo", 123)
self.assertEquals(self.cache.get("foo"), 123)
def test_invalidate(self):
self.cache.prefill(("foo",), 123)
self.cache.invalidate(("foo",))
failed = False
try:
self.cache.get(("foo",))
except KeyError:
failed = True
self.assertTrue(failed)
def test_eviction(self):
cache = Cache("test", max_entries=2)
cache.prefill(1, "one")
cache.prefill(2, "two")
cache.prefill(3, "three") # 1 will be evicted
failed = False
try:
cache.get(1)
except KeyError:
failed = True
self.assertTrue(failed)
cache.get(2)
cache.get(3)
def test_eviction_lru(self):
cache = Cache("test", max_entries=2)
cache.prefill(1, "one")
cache.prefill(2, "two")
# Now access 1 again, thus causing 2 to be least-recently used
cache.get(1)
cache.prefill(3, "three")
failed = False
try:
cache.get(2)
except KeyError:
failed = True
self.assertTrue(failed)
cache.get(1)
cache.get(3)
class CacheDecoratorTestCase(unittest.TestCase):
@defer.inlineCallbacks
def test_passthrough(self):
class A(object):
@cached()
def func(self, key):
return key
a = A()
self.assertEquals((yield a.func("foo")), "foo")
self.assertEquals((yield a.func("bar")), "bar")
@defer.inlineCallbacks
def test_hit(self):
callcount = [0]
class A(object):
@cached()
def func(self, key):
callcount[0] += 1
return key
a = A()
yield a.func("foo")
self.assertEquals(callcount[0], 1)
self.assertEquals((yield a.func("foo")), "foo")
self.assertEquals(callcount[0], 1)
@defer.inlineCallbacks
def test_invalidate(self):
callcount = [0]
class A(object):
@cached()
def func(self, key):
callcount[0] += 1
return key
a = A()
yield a.func("foo")
self.assertEquals(callcount[0], 1)
a.func.invalidate(("foo",))
yield a.func("foo")
self.assertEquals(callcount[0], 2)
def test_invalidate_missing(self):
class A(object):
@cached()
def func(self, key):
return key
A().func.invalidate(("what",))
@defer.inlineCallbacks
def test_max_entries(self):
callcount = [0]
class A(object):
@cached(max_entries=10)
def func(self, key):
callcount[0] += 1
return key
a = A()
for k in range(0, 12):
yield a.func(k)
self.assertEquals(callcount[0], 12)
# There must have been at least 2 evictions, meaning if we calculate
# all 12 values again, we must get called at least 2 more times
for k in range(0, 12):
yield a.func(k)
self.assertTrue(
callcount[0] >= 14,
msg="Expected callcount >= 14, got %d" % (callcount[0])
)
def test_prefill(self):
callcount = [0]
d = defer.succeed(123)
class A(object):
@cached()
def func(self, key):
callcount[0] += 1
return d
a = A()
a.func.prefill(("foo",), ObservableDeferred(d))
self.assertEquals(a.func("foo"), d.result)
self.assertEquals(callcount[0], 0)
@defer.inlineCallbacks
def test_invalidate_context(self):
callcount = [0]
callcount2 = [0]
class A(object):
@cached()
def func(self, key):
callcount[0] += 1
return key
@cached(cache_context=True)
def func2(self, key, cache_context):
callcount2[0] += 1
return self.func(key, on_invalidate=cache_context.invalidate)
a = A()
yield a.func2("foo")
self.assertEquals(callcount[0], 1)
self.assertEquals(callcount2[0], 1)
a.func.invalidate(("foo",))
yield a.func("foo")
self.assertEquals(callcount[0], 2)
self.assertEquals(callcount2[0], 1)
yield a.func2("foo")
self.assertEquals(callcount[0], 2)
self.assertEquals(callcount2[0], 2)
@defer.inlineCallbacks
def test_eviction_context(self):
callcount = [0]
callcount2 = [0]
class A(object):
@cached(max_entries=4) # HACK: This makes it 2 due to cache factor
def func(self, key):
callcount[0] += 1
return key
@cached(cache_context=True)
def func2(self, key, cache_context):
callcount2[0] += 1
return self.func(key, on_invalidate=cache_context.invalidate)
a = A()
yield a.func2("foo")
yield a.func2("foo2")
self.assertEquals(callcount[0], 2)
self.assertEquals(callcount2[0], 2)
yield a.func2("foo")
self.assertEquals(callcount[0], 2)
self.assertEquals(callcount2[0], 2)
yield a.func("foo3")
self.assertEquals(callcount[0], 3)
self.assertEquals(callcount2[0], 2)
yield a.func2("foo")
self.assertEquals(callcount[0], 4)
self.assertEquals(callcount2[0], 3)
@defer.inlineCallbacks
def test_double_get(self):
callcount = [0]
callcount2 = [0]
class A(object):
@cached()
def func(self, key):
callcount[0] += 1
return key
@cached(cache_context=True)
def func2(self, key, cache_context):
callcount2[0] += 1
return self.func(key, on_invalidate=cache_context.invalidate)
a = A()
a.func2.cache.cache = Mock(wraps=a.func2.cache.cache)
yield a.func2("foo")
self.assertEquals(callcount[0], 1)
self.assertEquals(callcount2[0], 1)
a.func2.invalidate(("foo",))
self.assertEquals(a.func2.cache.cache.pop.call_count, 1)
yield a.func2("foo")
a.func2.invalidate(("foo",))
self.assertEquals(a.func2.cache.cache.pop.call_count, 2)
self.assertEquals(callcount[0], 1)
self.assertEquals(callcount2[0], 2)
a.func.invalidate(("foo",))
self.assertEquals(a.func2.cache.cache.pop.call_count, 3)
yield a.func("foo")
self.assertEquals(callcount[0], 2)
self.assertEquals(callcount2[0], 2)
yield a.func2("foo")
self.assertEquals(callcount[0], 2)
self.assertEquals(callcount2[0], 3)
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