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Merge pull request #178 from matrix-org/erikj/cache_state_groups
Add cache to get_state_groups.
This commit is contained in:
Erik Johnston
commit
13ed3b9985
@ -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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@ -81,19 +81,23 @@ class StateStore(SQLBaseStore):
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f,
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)
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@defer.inlineCallbacks
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def c(vals):
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vals[:] = yield self._get_events(vals, get_prev_content=False)
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yield defer.gatherResults(
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state_list = yield defer.gatherResults(
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[
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c(vals)
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for vals in states.values()
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self._fetch_events_for_group(group, vals)
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for group, vals in states.items()
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],
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consumeErrors=True,
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)
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defer.returnValue(states)
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defer.returnValue(dict(state_list))
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@cached(num_args=1)
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def _fetch_events_for_group(self, state_group, events):
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return self._get_events(
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events, get_prev_content=False
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).addCallback(
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lambda evs: (state_group, evs)
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)
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def _store_state_groups_txn(self, txn, event, context):
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if context.current_state is None:
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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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a = A()
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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.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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