Merge commit 'f88c48f3b' into anoa/dinsic_release_1_18_x

* commit 'f88c48f3b':
  1.18.0rc1
  Fix error reporting when using `opentracing.trace` (#7961)
  Fix typing replication not being handled on master (#7959)
  Remove hacky error handling for inlineDeferreds. (#7950)
  Convert tests/rest/admin/test_room.py to unix file endings (#7953)
  Support oEmbed for media previews. (#7920)
  Convert state resolution to async/await (#7942)
  Fix up types and comments that refer to Deferreds. (#7945)
  Do not convert async functions to Deferreds in the interactive_auth_handler (#7944)
  Convert more of the media code to async/await (#7873)
  Return an empty body for OPTIONS requests. (#7886)
  Downgrade warning on client disconnect to INFO (#7928)
  Convert presence handler helpers to async/await. (#7939)
  Update the auth providers to be async. (#7935)
  Put a cache on `/state_ids` (#7931)

1 files changed, 11 insertions, 2 deletions

diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py

index 23625ba995..11c5d63298 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -109,6 +109,9 @@ class FederationServer(FederationBase):
         # We cache responses to state queries, as they take a while and often
         # come in waves.
         self._state_resp_cache = ResponseCache(hs, "state_resp", timeout_ms=30000)
+        self._state_ids_resp_cache = ResponseCache(
+            hs, "state_ids_resp", timeout_ms=30000
+        )
 
     async def on_backfill_request(
         self, origin: str, room_id: str, versions: List[str], limit: int
@@ -376,10 +379,16 @@ class FederationServer(FederationBase):
         if not in_room:
             raise AuthError(403, "Host not in room.")
 
+        resp = await self._state_ids_resp_cache.wrap(
+            (room_id, event_id), self._on_state_ids_request_compute, room_id, event_id,
+        )
+
+        return 200, resp
+
+    async def _on_state_ids_request_compute(self, room_id, event_id):
         state_ids = await self.handler.get_state_ids_for_pdu(room_id, event_id)
         auth_chain_ids = await self.store.get_auth_chain_ids(state_ids)
-
-        return 200, {"pdu_ids": state_ids, "auth_chain_ids": auth_chain_ids}
+        return {"pdu_ids": state_ids, "auth_chain_ids": auth_chain_ids}
 
     async def _on_context_state_request_compute(
         self, room_id: str, event_id: str