links: only news pass on

1 files changed, 12 insertions, 6 deletions

diff --git a/src/swarm/links.rs b/src/swarm/links.rs
index c430d58..54f18c6 100644
--- a/src/swarm/links.rs
+++ b/src/swarm/links.rs
@@ -899,15 +899,21 @@ pub(crate) fn received(state: &AppState, peer: &str, reply: LinksReply) {
                 route.arrived = true;
             }
             // Not older news over newer.
-            if inner
-                .replies
-                .get(&member)
-                .is_some_and(|(known, _)| *known > at)
-            {
+            let known = inner.replies.get(&member);
+            if known.is_some_and(|(known, _)| *known > at) {
                 return;
             }
+            // The same links as we have, lately: no news, so not passed on. A copy that
+            // went round between relays (each asking the other for the member) comes
+            // back a little newer each time, as its age counts from when each sent it:
+            // passed on, it would go round for good.
+            let news = known.is_none_or(|(known_at, known_links)| {
+                *known_links != links || now.saturating_duration_since(*known_at) >= REPLY_WITHIN
+            });
             inner.replies.insert(member.clone(), (at, links));
-            arrived.push(member);
+            if news {
+                arrived.push(member);
+            }
         };
         if own {
             keep(peer.to_owned(), Duration::ZERO, reply.links);