reduce roomid_mutex_state

Signed-off-by: Jason Volk <jason@zemos.net>

src/api/server/make_join.rs

@@ -1,5 +1,3 @@
-use std::sync::Arc;
-
 use ruma::{
 	api::{client::error::ErrorKind, federation::membership::prepare_join_event},
 	events::{
@@ -74,17 +72,11 @@ pub(crate) async fn create_join_event_template_route(
 		}
 	}
 
-	let mutex_state = Arc::clone(
-		services()
-			.globals
-			.roomid_mutex_state
-			.write()
-			.await
-			.entry(body.room_id.clone())
-			.or_default(),
-	);
-	let state_lock = mutex_state.lock().await;
-
+	let state_lock = services()
+		.globals
+		.roomid_mutex_state
+		.lock(&body.room_id)
+		.await;
 	let join_rules_event =
 		services()
 			.rooms