announcements answered only if heads differ

1 files changed, 8 insertions, 1 deletions

diff --git a/src/swarm/peer/inbound.rs b/src/swarm/peer/inbound.rs
index 18d29d5..1454c3e 100644
--- a/src/swarm/peer/inbound.rs
+++ b/src/swarm/peer/inbound.rs
@@ -143,8 +143,15 @@ pub(crate) async fn handle_message(
             crate::swarm::blob::handle(state, &peer, blob).await;
         }
         transport::ParsedMessage::Status(remote) => {
-            status_received(state, &peer).await;
+            // An announcement is no keepalive; it is answered only if our heads differ,
+            // so the announcer learns what we have that it lacks.
+            if !remote.announcing {
+                status_received(state, &peer).await;
+            }
             let local = on_status(state, &peer, &remote, reactivated).await;
+            if remote.announcing && local.heads == remote.heads {
+                return Ok(());
+            }
             if let Err(error) = state
                 .transport
                 .send_message(&peer, &ParsedMessage::StatusReply(local))