Update `get_users_in_room` mis-use to get hosts with dedicated `get_current_hosts_in_room` (#13605)

See https://github.com/matrix-org/synapse/pull/13575#discussion_r953023755

1 files changed, 7 insertions, 5 deletions

diff --git a/synapse/handlers/directory.py b/synapse/handlers/directory.py
index 948f66a94d..7127d5aefc 100644
--- a/synapse/handlers/directory.py
+++ b/synapse/handlers/directory.py
@@ -30,7 +30,7 @@ from synapse.api.errors import (
 from synapse.appservice import ApplicationService
 from synapse.module_api import NOT_SPAM
 from synapse.storage.databases.main.directory import RoomAliasMapping
-from synapse.types import JsonDict, Requester, RoomAlias, get_domain_from_id
+from synapse.types import JsonDict, Requester, RoomAlias
 
 if TYPE_CHECKING:
     from synapse.server import HomeServer
@@ -83,8 +83,9 @@ class DirectoryHandler:
         # TODO(erikj): Add transactions.
         # TODO(erikj): Check if there is a current association.
         if not servers:
-            users = await self.store.get_users_in_room(room_id)
-            servers = {get_domain_from_id(u) for u in users}
+            servers = await self._storage_controllers.state.get_current_hosts_in_room(
+                room_id
+            )
 
         if not servers:
             raise SynapseError(400, "Failed to get server list")
@@ -287,8 +288,9 @@ class DirectoryHandler:
                 Codes.NOT_FOUND,
             )
 
-        users = await self.store.get_users_in_room(room_id)
-        extra_servers = {get_domain_from_id(u) for u in users}
+        extra_servers = await self._storage_controllers.state.get_current_hosts_in_room(
+            room_id
+        )
         servers_set = set(extra_servers) | set(servers)
 
         # If this server is in the list of servers, return it first.