Process device list updates asynchronously (#12365)

synapse/handlers/device.py

@@ -291,12 +291,6 @@ class DeviceHandler(DeviceWorkerHandler):
         # On start up check if there are any updates pending.
         hs.get_reactor().callWhenRunning(self._handle_new_device_update_async)
 
-        # Used to decide if we calculate outbound pokes up front or not. By
-        # default we do to allow safely downgrading Synapse.
-        self.use_new_device_lists_changes_in_room = (
-            hs.config.server.use_new_device_lists_changes_in_room
-        )
-
     def _check_device_name_length(self, name: Optional[str]) -> None:
         """
         Checks whether a device name is longer than the maximum allowed length.
@@ -490,23 +484,9 @@ class DeviceHandler(DeviceWorkerHandler):
 
         room_ids = await self.store.get_rooms_for_user(user_id)
 
-        hosts: Optional[Set[str]] = None
-        if not self.use_new_device_lists_changes_in_room:
-            hosts = set()
-
-            if self.hs.is_mine_id(user_id):
-                for room_id in room_ids:
-                    joined_users = await self.store.get_users_in_room(room_id)
-                    hosts.update(get_domain_from_id(u) for u in joined_users)
-
-                set_tag("target_hosts", hosts)
-
-                hosts.discard(self.server_name)
-
         position = await self.store.add_device_change_to_streams(
             user_id,
             device_ids,
-            hosts=hosts,
             room_ids=room_ids,
         )
 
@@ -528,14 +508,6 @@ class DeviceHandler(DeviceWorkerHandler):
         # We may need to do some processing asynchronously.
         self._handle_new_device_update_async()
 
-        if hosts:
-            logger.info(
-                "Sending device list update notif for %r to: %r", user_id, hosts
-            )
-            for host in hosts:
-                self.federation_sender.send_device_messages(host, immediate=False)
-                log_kv({"message": "sent device update to host", "host": host})
-
     async def notify_user_signature_update(
         self, from_user_id: str, user_ids: List[str]
     ) -> None: