diff --git a/synapse/storage/_base.py b/synapse/storage/_base.py
index f1265541ba..8604d38c3e 100644
--- a/synapse/storage/_base.py
+++ b/synapse/storage/_base.py
@@ -15,6 +15,7 @@
import logging
from synapse.api.errors import StoreError
+from synapse.util.async import ObservableDeferred
from synapse.util.logutils import log_function
from synapse.util.logcontext import preserve_context_over_fn, LoggingContext
from synapse.util.lrucache import LruCache
@@ -173,33 +174,27 @@ class CacheDescriptor(object):
)
@functools.wraps(self.orig)
- @defer.inlineCallbacks
def wrapped(*args, **kwargs):
arg_dict = inspect.getcallargs(self.orig, obj, *args, **kwargs)
keyargs = [arg_dict[arg_nm] for arg_nm in self.arg_names]
try:
cached_result = cache.get(*keyargs)
- if DEBUG_CACHES:
- actual_result = yield self.function_to_call(obj, *args, **kwargs)
- if actual_result != cached_result:
- logger.error(
- "Stale cache entry %s%r: cached: %r, actual %r",
- self.orig.__name__, keyargs,
- cached_result, actual_result,
- )
- raise ValueError("Stale cache entry")
- defer.returnValue(cached_result)
+ return cached_result.observe()
except KeyError:
# Get the sequence number of the cache before reading from the
# database so that we can tell if the cache is invalidated
# while the SELECT is executing (SYN-369)
sequence = cache.sequence
- ret = yield self.function_to_call(obj, *args, **kwargs)
+ ret = defer.maybeDeferred(
+ self.function_to_call,
+ obj, *args, **kwargs
+ )
+ ret = ObservableDeferred(ret, consumeErrors=False)
cache.update(sequence, *(keyargs + [ret]))
- defer.returnValue(ret)
+ return ret.observe()
wrapped.invalidate = cache.invalidate
wrapped.invalidate_all = cache.invalidate_all
diff --git a/synapse/util/async.py b/synapse/util/async.py
index 5a1d545c96..7bf2d38bb8 100644
--- a/synapse/util/async.py
+++ b/synapse/util/async.py
@@ -51,7 +51,7 @@ class ObservableDeferred(object):
object.__setattr__(self, "_observers", set())
def callback(r):
- self._result = (True, r)
+ object.__setattr__(self, "_result", (True, r))
while self._observers:
try:
self._observers.pop().callback(r)
@@ -60,7 +60,7 @@ class ObservableDeferred(object):
return r
def errback(f):
- self._result = (False, f)
+ object.__setattr__(self, "_result", (False, f))
while self._observers:
try:
self._observers.pop().errback(f)
@@ -97,3 +97,8 @@ class ObservableDeferred(object):
def __setattr__(self, name, value):
setattr(self._deferred, name, value)
+
+ def __repr__(self):
+ return "<ObservableDeferred object at %s, result=%r, _deferred=%r>" % (
+ id(self), self._result, self._deferred,
+ )
diff --git a/tests/storage/test__base.py b/tests/storage/test__base.py
index 8c3d2952bd..8fa305d18a 100644
--- a/tests/storage/test__base.py
+++ b/tests/storage/test__base.py
@@ -17,6 +17,8 @@
from tests import unittest
from twisted.internet import defer
+from synapse.util.async import ObservableDeferred
+
from synapse.storage._base import Cache, cached
@@ -178,19 +180,20 @@ class CacheDecoratorTestCase(unittest.TestCase):
self.assertTrue(callcount[0] >= 14,
msg="Expected callcount >= 14, got %d" % (callcount[0]))
- @defer.inlineCallbacks
def test_prefill(self):
callcount = [0]
+ d = defer.succeed(123)
+
class A(object):
@cached()
def func(self, key):
callcount[0] += 1
- return key
+ return d
a = A()
- a.func.prefill("foo", 123)
+ a.func.prefill("foo", ObservableDeferred(d))
- self.assertEquals((yield a.func("foo")), 123)
+ self.assertEquals(a.func("foo").result, d.result)
self.assertEquals(callcount[0], 0)
|
