forked from MirrorHub/synapse
Caches should be bound to instances.
Before, caches were global and so different instances of the stores would share caches. This caused problems in the unit tests.
This commit is contained in:
Erik Johnston
parent
3483b78d1a
commit
d8866d7277
3 changed files with 81 additions and 50 deletions
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@ -127,7 +127,7 @@ class Cache(object):
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self.cache.clear()
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def cached(max_entries=1000, num_args=1, lru=False):
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class CacheDescriptor(object):
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""" A method decorator that applies a memoizing cache around the function.
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The function is presumed to take zero or more arguments, which are used in
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@ -141,25 +141,32 @@ def cached(max_entries=1000, num_args=1, lru=False):
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which can be used to insert values into the cache specifically, without
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calling the calculation function.
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"""
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def wrap(orig):
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def __init__(self, orig, max_entries=1000, num_args=1, lru=False):
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self.orig = orig
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self.max_entries = max_entries
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self.num_args = num_args
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self.lru = lru
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def __get__(self, obj, objtype=None):
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cache = Cache(
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name=orig.__name__,
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max_entries=max_entries,
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keylen=num_args,
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lru=lru,
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name=self.orig.__name__,
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max_entries=self.max_entries,
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keylen=self.num_args,
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lru=self.lru,
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)
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@functools.wraps(orig)
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@functools.wraps(self.orig)
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@defer.inlineCallbacks
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def wrapped(self, *keyargs):
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def wrapped(*keyargs):
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try:
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cached_result = cache.get(*keyargs)
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cached_result = cache.get(*keyargs[:self.num_args])
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if DEBUG_CACHES:
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actual_result = yield orig(self, *keyargs)
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actual_result = yield self.orig(obj, *keyargs)
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if actual_result != cached_result:
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logger.error(
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"Stale cache entry %s%r: cached: %r, actual %r",
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orig.__name__, keyargs,
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self.orig.__name__, keyargs,
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cached_result, actual_result,
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)
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raise ValueError("Stale cache entry")
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@ -170,18 +177,28 @@ def cached(max_entries=1000, num_args=1, lru=False):
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# while the SELECT is executing (SYN-369)
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sequence = cache.sequence
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ret = yield orig(self, *keyargs)
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ret = yield self.orig(obj, *keyargs)
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cache.update(sequence, *keyargs + (ret,))
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cache.update(sequence, *keyargs[:self.num_args] + (ret,))
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defer.returnValue(ret)
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wrapped.invalidate = cache.invalidate
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wrapped.invalidate_all = cache.invalidate_all
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wrapped.prefill = cache.prefill
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obj.__dict__[self.orig.__name__] = wrapped
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return wrapped
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return wrap
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def cached(max_entries=1000, num_args=1, lru=False):
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return lambda orig: CacheDescriptor(
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orig,
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max_entries=max_entries,
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num_args=num_args,
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lru=lru
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)
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class LoggingTransaction(object):
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@ -96,73 +96,84 @@ class CacheDecoratorTestCase(unittest.TestCase):
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@defer.inlineCallbacks
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def test_passthrough(self):
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class A(object):
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@cached()
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def func(self, key):
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return key
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self.assertEquals((yield func(self, "foo")), "foo")
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self.assertEquals((yield func(self, "bar")), "bar")
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a = A()
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self.assertEquals((yield a.func("foo")), "foo")
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self.assertEquals((yield a.func("bar")), "bar")
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@defer.inlineCallbacks
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def test_hit(self):
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callcount = [0]
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class A(object):
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@cached()
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def func(self, key):
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callcount[0] += 1
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return key
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yield func(self, "foo")
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a = A()
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yield a.func("foo")
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self.assertEquals(callcount[0], 1)
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self.assertEquals((yield func(self, "foo")), "foo")
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self.assertEquals((yield a.func("foo")), "foo")
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self.assertEquals(callcount[0], 1)
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@defer.inlineCallbacks
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def test_invalidate(self):
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callcount = [0]
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class A(object):
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@cached()
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def func(self, key):
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callcount[0] += 1
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return key
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yield func(self, "foo")
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a = A()
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yield a.func("foo")
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self.assertEquals(callcount[0], 1)
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func.invalidate("foo")
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a.func.invalidate("foo")
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yield func(self, "foo")
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yield a.func("foo")
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self.assertEquals(callcount[0], 2)
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def test_invalidate_missing(self):
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class A(object):
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@cached()
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def func(self, key):
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return key
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func.invalidate("what")
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A().func.invalidate("what")
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@defer.inlineCallbacks
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def test_max_entries(self):
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callcount = [0]
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class A(object):
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@cached(max_entries=10)
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def func(self, key):
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callcount[0] += 1
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return key
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for k in range(0,12):
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yield func(self, k)
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a = A()
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for k in range(0, 12):
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yield a.func(k)
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self.assertEquals(callcount[0], 12)
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# There must have been at least 2 evictions, meaning if we calculate
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# all 12 values again, we must get called at least 2 more times
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for k in range(0,12):
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yield func(self, k)
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yield a.func(k)
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self.assertTrue(callcount[0] >= 14,
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msg="Expected callcount >= 14, got %d" % (callcount[0]))
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@ -171,12 +182,15 @@ class CacheDecoratorTestCase(unittest.TestCase):
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def test_prefill(self):
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callcount = [0]
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class A(object):
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@cached()
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def func(self, key):
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callcount[0] += 1
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return key
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func.prefill("foo", 123)
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a = A()
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self.assertEquals((yield func(self, "foo")), 123)
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a.func.prefill("foo", 123)
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self.assertEquals((yield a.func("foo")), 123)
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self.assertEquals(callcount[0], 0)
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@ -46,7 +46,7 @@ class RegistrationStoreTestCase(unittest.TestCase):
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(yield self.store.get_user_by_id(self.user_id))
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)
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result = yield self.store.get_user_by_token(self.tokens[1])
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result = yield self.store.get_user_by_token(self.tokens[0])
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self.assertDictContainsSubset(
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{
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