From 13683a3a223a3f08b295973e7b8aa6e9299a2fa5 Mon Sep 17 00:00:00 2001 From: Richard van der Hoff <1389908+richvdh@users.noreply.github.com> Date: Wed, 22 Apr 2020 13:45:40 +0100 Subject: Extend StreamChangeCache to support multiple entities per stream ID (#7303) First some background: StreamChangeCache is used to keep track of what "entities" have changed since a given stream ID. So for example, we might use it to keep track of when the last to-device message for a given user was received [1], and hence whether we need to pull any to-device messages from the database on a sync [2]. Now, it turns out that StreamChangeCache didn't support more than one thing being changed at a given stream_id (this was part of the problem with #7206). However, it's entirely valid to send to-device messages to more than one user at a time. As it turns out, this did in fact work, because *some* methods of StreamChangeCache coped ok with having multiple things changing on the same stream ID, and it seems we never actually use the methods which don't work on the stream change caches where we allow multiple changes at the same stream ID. But that feels horribly fragile, hence: let's update StreamChangeCache to properly support this, and add some typing and some more tests while we're at it. [1]: https://github.com/matrix-org/synapse/blob/release-v1.12.3/synapse/storage/data_stores/main/deviceinbox.py#L301 [2]: https://github.com/matrix-org/synapse/blob/release-v1.12.3/synapse/storage/data_stores/main/deviceinbox.py#L47-L51 --- tests/util/test_stream_change_cache.py | 69 +++++++++++++++++++++++++++++----- 1 file changed, 60 insertions(+), 9 deletions(-) (limited to 'tests') diff --git a/tests/util/test_stream_change_cache.py b/tests/util/test_stream_change_cache.py index 72a9de5370..6857933540 100644 --- a/tests/util/test_stream_change_cache.py +++ b/tests/util/test_stream_change_cache.py @@ -28,18 +28,26 @@ class StreamChangeCacheTests(unittest.TestCase): cache.entity_has_changed("user@foo.com", 6) cache.entity_has_changed("bar@baz.net", 7) + # also test multiple things changing on the same stream ID + cache.entity_has_changed("user2@foo.com", 8) + cache.entity_has_changed("bar2@baz.net", 8) + # If it's been changed after that stream position, return True self.assertTrue(cache.has_entity_changed("user@foo.com", 4)) self.assertTrue(cache.has_entity_changed("bar@baz.net", 4)) + self.assertTrue(cache.has_entity_changed("bar2@baz.net", 4)) + self.assertTrue(cache.has_entity_changed("user2@foo.com", 4)) # If it's been changed at that stream position, return False self.assertFalse(cache.has_entity_changed("user@foo.com", 6)) + self.assertFalse(cache.has_entity_changed("user2@foo.com", 8)) # If there's no changes after that stream position, return False self.assertFalse(cache.has_entity_changed("user@foo.com", 7)) + self.assertFalse(cache.has_entity_changed("user2@foo.com", 9)) # If the entity does not exist, return False. - self.assertFalse(cache.has_entity_changed("not@here.website", 7)) + self.assertFalse(cache.has_entity_changed("not@here.website", 9)) # If we request before the stream cache's earliest known position, # return True, whether it's a known entity or not. @@ -47,7 +55,7 @@ class StreamChangeCacheTests(unittest.TestCase): self.assertTrue(cache.has_entity_changed("not@here.website", 0)) @patch("synapse.util.caches.CACHE_SIZE_FACTOR", 1.0) - def test_has_entity_changed_pops_off_start(self): + def test_entity_has_changed_pops_off_start(self): """ StreamChangeCache.entity_has_changed will respect the max size and purge the oldest items upon reaching that max size. @@ -64,11 +72,20 @@ class StreamChangeCacheTests(unittest.TestCase): # The oldest item has been popped off self.assertTrue("user@foo.com" not in cache._entity_to_key) + self.assertEqual( + cache.get_all_entities_changed(2), ["bar@baz.net", "user@elsewhere.org"], + ) + self.assertIsNone(cache.get_all_entities_changed(1)) + # If we update an existing entity, it keeps the two existing entities cache.entity_has_changed("bar@baz.net", 5) self.assertEqual( {"bar@baz.net", "user@elsewhere.org"}, set(cache._entity_to_key) ) + self.assertEqual( + cache.get_all_entities_changed(2), ["user@elsewhere.org", "bar@baz.net"], + ) + self.assertIsNone(cache.get_all_entities_changed(1)) def test_get_all_entities_changed(self): """ @@ -80,18 +97,52 @@ class StreamChangeCacheTests(unittest.TestCase): cache.entity_has_changed("user@foo.com", 2) cache.entity_has_changed("bar@baz.net", 3) + cache.entity_has_changed("anotheruser@foo.com", 3) cache.entity_has_changed("user@elsewhere.org", 4) - self.assertEqual( - cache.get_all_entities_changed(1), - ["user@foo.com", "bar@baz.net", "user@elsewhere.org"], - ) - self.assertEqual( - cache.get_all_entities_changed(2), ["bar@baz.net", "user@elsewhere.org"] - ) + r = cache.get_all_entities_changed(1) + + # either of these are valid + ok1 = [ + "user@foo.com", + "bar@baz.net", + "anotheruser@foo.com", + "user@elsewhere.org", + ] + ok2 = [ + "user@foo.com", + "anotheruser@foo.com", + "bar@baz.net", + "user@elsewhere.org", + ] + self.assertTrue(r == ok1 or r == ok2) + + r = cache.get_all_entities_changed(2) + self.assertTrue(r == ok1[1:] or r == ok2[1:]) + self.assertEqual(cache.get_all_entities_changed(3), ["user@elsewhere.org"]) self.assertEqual(cache.get_all_entities_changed(0), None) + # ... later, things gest more updates + cache.entity_has_changed("user@foo.com", 5) + cache.entity_has_changed("bar@baz.net", 5) + cache.entity_has_changed("anotheruser@foo.com", 6) + + ok1 = [ + "user@elsewhere.org", + "user@foo.com", + "bar@baz.net", + "anotheruser@foo.com", + ] + ok2 = [ + "user@elsewhere.org", + "bar@baz.net", + "user@foo.com", + "anotheruser@foo.com", + ] + r = cache.get_all_entities_changed(3) + self.assertTrue(r == ok1 or r == ok2) + def test_has_any_entity_changed(self): """ StreamChangeCache.has_any_entity_changed will return True if any -- cgit 1.4.1