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Fix to-device being dropped in limited sync in SQLite. (#11966)

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If ther are more than 100 to-device messages pending for a device
`/sync` will only return the first 100, however the next batch token was
incorrectly calculated and so all other pending messages would be
dropped.

This is due to `txn.rowcount` only returning the number of rows that
*changed*, rather than the number *selected* in SQLite.
This commit is contained in:
Erik Johnston 2022-02-11 13:38:05 +00:00 committed by GitHub
parent 4ef39f3353
commit 79fb64e417
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3 changed files with 45 additions and 1 deletions
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1
changelog.d/11966.bugfix Normal file
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@ -0,0 +1 @@
Fix to-device messages being dropped during limited sync when using SQLite.

5
synapse/storage/databases/main/deviceinbox.py
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@ -362,7 +362,10 @@ class DeviceInboxWorkerStore(SQLBaseStore):
# intended for each device.
last_processed_stream_pos = to_stream_id
recipient_device_to_messages: Dict[Tuple[str, str], List[JsonDict]] = {}
rowcount = 0
for row in txn:
rowcount += 1
last_processed_stream_pos = row[0]
recipient_user_id = row[1]
recipient_device_id = row[2]
@ -373,7 +376,7 @@ class DeviceInboxWorkerStore(SQLBaseStore):
(recipient_user_id, recipient_device_id), []
).append(message_dict)
if limit is not None and txn.rowcount == limit:
if limit is not None and rowcount == limit:
# We ended up bumping up against the message limit. There may be more messages
# to retrieve. Return what we have, as well as the last stream position that
# was processed.

40
tests/rest/client/test_sendtodevice.py
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@ -198,3 +198,43 @@ class SendToDeviceTestCase(HomeserverTestCase):
"content": {"idx": 3},
},
)
def test_limited_sync(self):
"""If a limited sync for to-devices happens the next /sync should respond immediately."""
self.register_user("u1", "pass")
user1_tok = self.login("u1", "pass", "d1")
user2 = self.register_user("u2", "pass")
user2_tok = self.login("u2", "pass", "d2")
# Do an initial sync
channel = self.make_request("GET", "/sync", access_token=user2_tok)
self.assertEqual(channel.code, 200, channel.result)
sync_token = channel.json_body["next_batch"]
# Send 150 to-device messages. We limit to 100 in `/sync`
for i in range(150):
test_msg = {"foo": "bar"}
chan = self.make_request(
"PUT",
f"/_matrix/client/r0/sendToDevice/m.test/1234-{i}",
content={"messages": {user2: {"d2": test_msg}}},
access_token=user1_tok,
)
self.assertEqual(chan.code, 200, chan.result)
channel = self.make_request(
"GET", f"/sync?since={sync_token}&timeout=300000", access_token=user2_tok
)
self.assertEqual(channel.code, 200, channel.result)
messages = channel.json_body.get("to_device", {}).get("events", [])
self.assertEqual(len(messages), 100)
sync_token = channel.json_body["next_batch"]
channel = self.make_request(
"GET", f"/sync?since={sync_token}&timeout=300000", access_token=user2_tok
)
self.assertEqual(channel.code, 200, channel.result)
messages = channel.json_body.get("to_device", {}).get("events", [])
self.assertEqual(len(messages), 50)