💄 de-dupe unregistered servers list

crates/ptth_relay/src/lib.rs

@@ -22,6 +22,7 @@
 
 use std::{
 	borrow::Cow,
+	collections::HashSet,
 	convert::Infallible,
 	net::SocketAddr,
 	path::{Path, PathBuf},
@@ -358,20 +359,33 @@ async fn handle_unregistered_servers_internal (state: &Arc <Relay>)
 	let now = Utc::now ();
 	
 	let server_list = state.unregistered_servers.to_vec ().await;
+	let mut seen_tripcodes = HashSet::new ();
 	
 	let unregistered_servers = server_list.into_iter ()
-	.map (|x| {
+	.rev ()
+	.filter_map (|x| {
 		let last_seen = match pretty_print_last_seen (now, x.seen) {
 			Negative => "Error (negative time)".into (),
 			Connected => "Recently".into (),
 			Description (s) => s,
 		};
 		
-		UnregisteredServer {
-			name: x.name,
-			tripcode: base64::encode (x.tripcode.as_bytes ()),
-			last_seen,
+		let t = (x.name, x.tripcode);
+		
+		if seen_tripcodes.contains (&t) {
+			return None;
 		}
+		seen_tripcodes.insert (t.clone ());
+		
+		let (name, tripcode) = t;
+		
+		let tripcode = base64::encode (tripcode.as_bytes ());
+		
+		Some (UnregisteredServer {
+			name,
+			tripcode,
+			last_seen,
+		})
 	}).collect ();
 	
 	UnregisteredServerListPage {