Cache get_recent_events_for_room

synapse/storage/stream.py

@@ -35,7 +35,7 @@ what sort order was used:
 
 from twisted.internet import defer
 
-from ._base import SQLBaseStore
+from ._base import SQLBaseStore, cachedInlineCallbacks
 from synapse.api.constants import EventTypes
 from synapse.types import RoomStreamToken
 from synapse.util.logutils import log_function
@@ -299,7 +299,7 @@ class StreamStore(SQLBaseStore):
 
         defer.returnValue((events, token))
 
-    @defer.inlineCallbacks
+    @cachedInlineCallbacks(num_args=4)
     def get_recent_events_for_room(self, room_id, limit, end_token, from_token=None):
         # TODO (erikj): Handle compressed feedback