From 09cbcb78d3f474ada72d604a24a44c91f2fdb6fe Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Mon, 12 Dec 2016 14:41:51 +0000
Subject: [PATCH] Add cache to get_public_room_ids_at_stream_id

---
 synapse/replication/slave/storage/room.py | 3 ++-
 synapse/storage/room.py                   | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/synapse/replication/slave/storage/room.py b/synapse/replication/slave/storage/room.py
index 23c613863f..6df9a25ef3 100644
--- a/synapse/replication/slave/storage/room.py
+++ b/synapse/replication/slave/storage/room.py
@@ -15,6 +15,7 @@
 
 from ._base import BaseSlavedStore
 from synapse.storage import DataStore
+from synapse.storage.room import RoomStore
 from ._slaved_id_tracker import SlavedIdTracker
 
 
@@ -30,7 +31,7 @@ class RoomStore(BaseSlavedStore):
         DataStore.get_current_public_room_stream_id.__func__
     )
     get_public_room_ids_at_stream_id = (
-        DataStore.get_public_room_ids_at_stream_id.__func__
+        RoomStore.__dict__["get_public_room_ids_at_stream_id"]
     )
     get_public_room_ids_at_stream_id_txn = (
         DataStore.get_public_room_ids_at_stream_id_txn.__func__
diff --git a/synapse/storage/room.py b/synapse/storage/room.py
index 36aa8c5f83..8a2fe2fdf5 100644
--- a/synapse/storage/room.py
+++ b/synapse/storage/room.py
@@ -16,6 +16,7 @@
 from twisted.internet import defer
 
 from synapse.api.errors import StoreError
+from synapse.util.caches.descriptors import cached
 
 from ._base import SQLBaseStore
 from .engines import PostgresEngine, Sqlite3Engine
@@ -346,6 +347,7 @@ class RoomStore(SQLBaseStore):
     def get_current_public_room_stream_id(self):
         return self._public_room_id_gen.get_current_token()
 
+    @cached(num_args=2, max_entries=100)
     def get_public_room_ids_at_stream_id(self, stream_id, network_tuple):
         """Get pulbic rooms for a particular list, or across all lists.