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Add some more tests
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@ -39,6 +39,101 @@ class DeferredCacheTestCase(TestCase):
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self.assertEquals(self.successResultOf(cache.get("foo")), 123)
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self.assertEquals(self.successResultOf(cache.get("foo")), 123)
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def test_hit_deferred(self):
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cache = DeferredCache("test")
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origin_d = defer.Deferred()
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set_d = cache.set("k1", origin_d)
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# get should return an incomplete deferred
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get_d = cache.get("k1")
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self.assertFalse(get_d.called)
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# add a callback that will make sure that the set_d gets called before the get_d
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def check1(r):
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self.assertTrue(set_d.called)
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return r
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# TODO: Actually ObservableDeferred *doesn't* run its tests in order on py3.8.
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# maybe we should fix that?
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# get_d.addCallback(check1)
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# now fire off all the deferreds
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origin_d.callback(99)
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self.assertEqual(self.successResultOf(origin_d), 99)
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self.assertEqual(self.successResultOf(set_d), 99)
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self.assertEqual(self.successResultOf(get_d), 99)
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def test_callbacks(self):
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"""Invalidation callbacks are called at the right time"""
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cache = DeferredCache("test")
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callbacks = set()
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# start with an entry, with a callback
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cache.prefill("k1", 10, callback=lambda: callbacks.add("prefill"))
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# now replace that entry with a pending result
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origin_d = defer.Deferred()
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set_d = cache.set("k1", origin_d, callback=lambda: callbacks.add("set"))
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# ... and also make a get request
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get_d = cache.get("k1", callback=lambda: callbacks.add("get"))
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# we don't expect the invalidation callback for the original value to have
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# been called yet, even though get() will now return a different result.
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# I'm not sure if that is by design or not.
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self.assertEqual(callbacks, set())
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# now fire off all the deferreds
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origin_d.callback(20)
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self.assertEqual(self.successResultOf(set_d), 20)
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self.assertEqual(self.successResultOf(get_d), 20)
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# now the original invalidation callback should have been called, but none of
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# the others
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self.assertEqual(callbacks, {"prefill"})
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callbacks.clear()
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# another update should invalidate both the previous results
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cache.prefill("k1", 30)
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self.assertEqual(callbacks, {"set", "get"})
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def test_set_fail(self):
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cache = DeferredCache("test")
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callbacks = set()
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# start with an entry, with a callback
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cache.prefill("k1", 10, callback=lambda: callbacks.add("prefill"))
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# now replace that entry with a pending result
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origin_d = defer.Deferred()
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set_d = cache.set("k1", origin_d, callback=lambda: callbacks.add("set"))
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# ... and also make a get request
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get_d = cache.get("k1", callback=lambda: callbacks.add("get"))
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# none of the callbacks should have been called yet
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self.assertEqual(callbacks, set())
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# oh noes! fails!
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e = Exception("oops")
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origin_d.errback(e)
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self.assertIs(self.failureResultOf(set_d, Exception).value, e)
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self.assertIs(self.failureResultOf(get_d, Exception).value, e)
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# the callbacks for the failed requests should have been called.
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# I'm not sure if this is deliberate or not.
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self.assertEqual(callbacks, {"get", "set"})
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callbacks.clear()
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# the old value should still be returned now?
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get_d2 = cache.get("k1", callback=lambda: callbacks.add("get2"))
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self.assertEqual(self.successResultOf(get_d2), 10)
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# replacing the value now should run the callbacks for those requests
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# which got the original result
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cache.prefill("k1", 30)
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self.assertEqual(callbacks, {"prefill", "get2"})
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def test_get_immediate(self):
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def test_get_immediate(self):
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cache = DeferredCache("test")
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cache = DeferredCache("test")
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d1 = defer.Deferred()
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d1 = defer.Deferred()
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@ -14,6 +14,7 @@
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# See the License for the specific language governing permissions and
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# limitations under the License.
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import logging
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import logging
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from typing import Set
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import mock
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import mock
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@ -130,6 +131,57 @@ class DescriptorTestCase(unittest.TestCase):
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d = obj.fn(1)
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d = obj.fn(1)
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self.failureResultOf(d, SynapseError)
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self.failureResultOf(d, SynapseError)
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def test_cache_with_async_exception(self):
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"""The wrapped function returns a failure
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"""
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class Cls:
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result = None
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call_count = 0
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@cached()
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def fn(self, arg1):
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self.call_count += 1
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return self.result
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obj = Cls()
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callbacks = set() # type: Set[str]
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# set off an asynchronous request
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obj.result = origin_d = defer.Deferred()
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d1 = obj.fn(1, on_invalidate=lambda: callbacks.add("d1"))
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self.assertFalse(d1.called)
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# a second request should also return a deferred, but should not call the
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# function itself.
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d2 = obj.fn(1, on_invalidate=lambda: callbacks.add("d2"))
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self.assertFalse(d2.called)
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self.assertEqual(obj.call_count, 1)
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# no callbacks yet
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self.assertEqual(callbacks, set())
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# the original request fails
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e = Exception("bzz")
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origin_d.errback(e)
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# ... which should cause the lookups to fail similarly
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self.assertIs(self.failureResultOf(d1, Exception).value, e)
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self.assertIs(self.failureResultOf(d2, Exception).value, e)
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# ... and the callbacks to have been, uh, called.
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self.assertEqual(callbacks, {"d1", "d2"})
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# ... leaving the cache empty
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self.assertEqual(len(obj.fn.cache.cache), 0)
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# and a second call should work as normal
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obj.result = defer.succeed(100)
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d3 = obj.fn(1)
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self.assertEqual(self.successResultOf(d3), 100)
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self.assertEqual(obj.call_count, 2)
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def test_cache_logcontexts(self):
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def test_cache_logcontexts(self):
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"""Check that logcontexts are set and restored correctly when
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"""Check that logcontexts are set and restored correctly when
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using the cache."""
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using the cache."""
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