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authorErik Johnston <erik@matrix.org>2020-10-07 13:49:40 +0100
committerGitHub <noreply@github.com>2020-10-07 13:49:40 +0100
commit9ca6341969b8b84c0c79a29fb914d1d8dbb3e320 (patch)
tree50b59bc15ce1d139fa3faef4eda0c36ef27ee308
parentunblacklist some tests (#8474) (diff)
downloadsynapse-9ca6341969b8b84c0c79a29fb914d1d8dbb3e320.tar.xz
Fix returning incorrect prev_batch token in incremental sync (#8486)
-rw-r--r--changelog.d/8486.bugfix1
-rw-r--r--synapse/handlers/sync.py7
2 files changed, 7 insertions, 1 deletions
diff --git a/changelog.d/8486.bugfix b/changelog.d/8486.bugfix
new file mode 100644
index 0000000000..63fc091ba6
--- /dev/null
+++ b/changelog.d/8486.bugfix
@@ -0,0 +1 @@
+Fix incremental sync returning an incorrect `prev_batch` token in timeline section, which when used to paginate returned events that were included in the incremental sync. Broken since v0.16.0.
diff --git a/synapse/handlers/sync.py b/synapse/handlers/sync.py
index dd1f90e359..6fb8332f93 100644
--- a/synapse/handlers/sync.py
+++ b/synapse/handlers/sync.py
@@ -460,8 +460,13 @@ class SyncHandler:
                 recents = []
 
             if not limited or block_all_timeline:
+                prev_batch_token = now_token
+                if recents:
+                    room_key = recents[0].internal_metadata.before
+                    prev_batch_token = now_token.copy_and_replace("room_key", room_key)
+
                 return TimelineBatch(
-                    events=recents, prev_batch=now_token, limited=False
+                    events=recents, prev_batch=prev_batch_token, limited=False
                 )
 
             filtering_factor = 2