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authorErik Johnston <erik@matrix.org>2022-03-04 17:57:27 +0000
committerGitHub <noreply@github.com>2022-03-04 17:57:27 +0000
commit0752ab7a3621b90073f9332fbfdc8afe16a3be01 (patch)
tree84f4e4b57acf0e81daff5fc855e5fc7ea6aca692 /synapse/storage
parentAdd type hints for `ObservableDeferred` attributes (#12159) (diff)
downloadsynapse-0752ab7a3621b90073f9332fbfdc8afe16a3be01.tar.xz
Reduce to-device queries for /sync. (#12163)
Diffstat (limited to 'synapse/storage')
-rw-r--r--synapse/storage/databases/main/deviceinbox.py3
1 files changed, 3 insertions, 0 deletions
diff --git a/synapse/storage/databases/main/deviceinbox.py b/synapse/storage/databases/main/deviceinbox.py
index 1392363de1..b4a1b041b1 100644
--- a/synapse/storage/databases/main/deviceinbox.py
+++ b/synapse/storage/databases/main/deviceinbox.py
@@ -298,6 +298,9 @@ class DeviceInboxWorkerStore(SQLBaseStore):
                 # This user has new messages sent to them. Query messages for them
                 user_ids_to_query.add(user_id)
 
+        if not user_ids_to_query:
+            return {}, to_stream_id
+
         def get_device_messages_txn(txn: LoggingTransaction):
             # Build a query to select messages from any of the given devices that
             # are between the given stream id bounds.