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authorErik Johnston <erikj@element.io>2024-07-02 12:39:49 +0100
committerGitHub <noreply@github.com>2024-07-02 12:39:49 +0100
commitb3b793786c82383edec6c7d3226d98dbafe3b098 (patch)
tree42799dd94510980636618488995ed133bcf4d73c /tests/rest/client
parentFix building debian packages on non-clean checkouts (#17390) (diff)
downloadsynapse-b3b793786c82383edec6c7d3226d98dbafe3b098.tar.xz
Fix sync waiting for an invalid token from the "future" (#17386)
Fixes https://github.com/element-hq/synapse/issues/17274, hopefully.

Basically, old versions of Synapse could advance streams without
persisting anything in the DB (fixed in #17229). On restart those
updates would get lost, and so the position of the stream would revert
to an older position. If this happened across an upgrade to a later
Synapse version which included #17215, then sync could get blocked
indefinitely (until the stream advanced to the position in the token).

We fix this by bounding the stream positions we'll wait for to the
maximum position of the underlying stream ID generator.
Diffstat (limited to 'tests/rest/client')
-rw-r--r--tests/rest/client/test_sync.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/tests/rest/client/test_sync.py b/tests/rest/client/test_sync.py
index bfb26139d3..12c11f342c 100644
--- a/tests/rest/client/test_sync.py
+++ b/tests/rest/client/test_sync.py
@@ -1386,10 +1386,12 @@ class SlidingSyncTestCase(unittest.HomeserverTestCase):
         # Create a future token that will cause us to wait. Since we never send a new
         # event to reach that future stream_ordering, the worker will wait until the
         # full timeout.
+        stream_id_gen = self.store.get_events_stream_id_generator()
+        stream_id = self.get_success(stream_id_gen.get_next().__aenter__())
         current_token = self.event_sources.get_current_token()
         future_position_token = current_token.copy_and_replace(
             StreamKeyType.ROOM,
-            RoomStreamToken(stream=current_token.room_key.stream + 1),
+            RoomStreamToken(stream=stream_id),
         )
 
         future_position_token_serialized = self.get_success(