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-rw-r--r--synapse/storage/databases/main/receipts.py14
1 files changed, 6 insertions, 8 deletions
diff --git a/synapse/storage/databases/main/receipts.py b/synapse/storage/databases/main/receipts.py
index 4a0d5a320e..c79ddff680 100644
--- a/synapse/storage/databases/main/receipts.py
+++ b/synapse/storage/databases/main/receipts.py
@@ -31,17 +31,15 @@ from synapse.util.caches.stream_change_cache import StreamChangeCache
 logger = logging.getLogger(__name__)
 
 
-class ReceiptsWorkerStore(SQLBaseStore):
+# The ABCMeta metaclass ensures that it cannot be instantiated without
+# the abstract methods being implemented.
+class ReceiptsWorkerStore(SQLBaseStore, metaclass=abc.ABCMeta):
     """This is an abstract base class where subclasses must implement
     `get_max_receipt_stream_id` which can be called in the initializer.
     """
 
-    # This ABCMeta metaclass ensures that we cannot be instantiated without
-    # the abstract methods being implemented.
-    __metaclass__ = abc.ABCMeta
-
     def __init__(self, database: DatabasePool, db_conn, hs):
-        super(ReceiptsWorkerStore, self).__init__(database, db_conn, hs)
+        super().__init__(database, db_conn, hs)
 
         self._receipts_stream_cache = StreamChangeCache(
             "ReceiptsRoomChangeCache", self.get_max_receipt_stream_id()
@@ -388,7 +386,7 @@ class ReceiptsStore(ReceiptsWorkerStore):
             db_conn, "receipts_linearized", "stream_id"
         )
 
-        super(ReceiptsStore, self).__init__(database, db_conn, hs)
+        super().__init__(database, db_conn, hs)
 
     def get_max_receipt_stream_id(self):
         return self._receipts_id_gen.get_current_token()
@@ -526,7 +524,7 @@ class ReceiptsStore(ReceiptsWorkerStore):
                 "insert_receipt_conv", graph_to_linear
             )
 
-        with await self._receipts_id_gen.get_next() as stream_id:
+        async with self._receipts_id_gen.get_next() as stream_id:
             event_ts = await self.db_pool.runInteraction(
                 "insert_linearized_receipt",
                 self.insert_linearized_receipt_txn,