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

4 files changed, 18 insertions, 12 deletions

diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index f5c586f657..9c2c3a0e68 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -310,6 +310,7 @@ class DeviceHandler(DeviceWorkerHandler):
         super().__init__(hs)
 
         self.federation_sender = hs.get_federation_sender()
+        self._storage_controllers = hs.get_storage_controllers()
 
         self.device_list_updater = DeviceListUpdater(hs, self)
 
@@ -694,8 +695,11 @@ class DeviceHandler(DeviceWorkerHandler):
 
                     # Ignore any users that aren't ours
                     if self.hs.is_mine_id(user_id):
-                        joined_user_ids = await self.store.get_users_in_room(room_id)
-                        hosts = {get_domain_from_id(u) for u in joined_user_ids}
+                        hosts = set(
+                            await self._storage_controllers.state.get_current_hosts_in_room(
+                                room_id
+                            )
+                        )
                         hosts.discard(self.server_name)
 
                     # Check if we've already sent this update to some hosts
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.
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 741504ba9f..4e575ffbaa 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -2051,8 +2051,7 @@ async def get_interested_remotes(
     )
 
     for room_id, states in room_ids_to_states.items():
-        user_ids = await store.get_users_in_room(room_id)
-        hosts = {get_domain_from_id(user_id) for user_id in user_ids}
+        hosts = await store.get_current_hosts_in_room(room_id)
         for host in hosts:
             hosts_and_states.setdefault(host, set()).update(states)
 
diff --git a/synapse/handlers/typing.py b/synapse/handlers/typing.py
index bcac3372a2..a4cd8b8f0c 100644
--- a/synapse/handlers/typing.py
+++ b/synapse/handlers/typing.py
@@ -26,7 +26,7 @@ from synapse.metrics.background_process_metrics import (
 )
 from synapse.replication.tcp.streams import TypingStream
 from synapse.streams import EventSource
-from synapse.types import JsonDict, Requester, StreamKeyType, UserID, get_domain_from_id
+from synapse.types import JsonDict, Requester, StreamKeyType, UserID
 from synapse.util.caches.stream_change_cache import StreamChangeCache
 from synapse.util.metrics import Measure
 from synapse.util.wheel_timer import WheelTimer
@@ -362,8 +362,9 @@ class TypingWriterHandler(FollowerTypingHandler):
             )
             return
 
-        users = await self.store.get_users_in_room(room_id)
-        domains = {get_domain_from_id(u) for u in users}
+        domains = await self._storage_controllers.state.get_current_hosts_in_room(
+            room_id
+        )
 
         if self.server_name in domains:
             logger.info("Got typing update from %s: %r", user_id, content)