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authorNick Mills-Barrett <nick@beeper.com>2023-05-18 19:37:31 +0100
committerGitHub <noreply@github.com>2023-05-18 14:37:31 -0400
commitad50510a06d035a674f0eeed5db5dd3060bc0b1c (patch)
treeb2b8110f0d5e223a0bd28d5f4e4a8acac1e7dcd1 /synapse/handlers/read_marker.py
parentUpdate Mutual Rooms (MSC2666) implementation (#15621) (diff)
downloadsynapse-ad50510a06d035a674f0eeed5db5dd3060bc0b1c.tar.xz
Handle missing previous read marker event. (#15464)
If the previous read marker is pointing to an event that no longer exists
(e.g. due to retention) then assume that the newly given read marker
is newer.
Diffstat (limited to 'synapse/handlers/read_marker.py')
-rw-r--r--synapse/handlers/read_marker.py18
1 files changed, 14 insertions, 4 deletions
diff --git a/synapse/handlers/read_marker.py b/synapse/handlers/read_marker.py
index 6d35e61880..49a497a860 100644
--- a/synapse/handlers/read_marker.py
+++ b/synapse/handlers/read_marker.py
@@ -16,6 +16,7 @@ import logging
 from typing import TYPE_CHECKING
 
 from synapse.api.constants import ReceiptTypes
+from synapse.api.errors import SynapseError
 from synapse.util.async_helpers import Linearizer
 
 if TYPE_CHECKING:
@@ -47,12 +48,21 @@ class ReadMarkerHandler:
             )
 
             should_update = True
+            # Get event ordering, this also ensures we know about the event
+            event_ordering = await self.store.get_event_ordering(event_id)
 
             if existing_read_marker:
-                # Only update if the new marker is ahead in the stream
-                should_update = await self.store.is_event_after(
-                    event_id, existing_read_marker["event_id"]
-                )
+                try:
+                    old_event_ordering = await self.store.get_event_ordering(
+                        existing_read_marker["event_id"]
+                    )
+                except SynapseError:
+                    # Old event no longer exists, assume new is ahead. This may
+                    # happen if the old event was removed due to retention.
+                    pass
+                else:
+                    # Only update if the new marker is ahead in the stream
+                    should_update = event_ordering > old_event_ordering
 
             if should_update:
                 content = {"event_id": event_id}