From 6b046a5c18d670c3097b8563c191a2dc06ce1179 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sat, 24 Oct 2026 04:50:16 +0200
Subject: record RTT from keepalive messages

---
 src/api/peers.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/api/peers.rs')

diff --git a/src/api/peers.rs b/src/api/peers.rs
index d381395..3893e0f 100644
--- a/src/api/peers.rs
+++ b/src/api/peers.rs
@@ -62,6 +62,9 @@ pub(crate) struct PeerStatus {
     heads: Option<usize>,
     /// We keep it alive and sync with it on our own; other peers we only answer.
     neighbour: bool,
+    /// Smoothed round-trip time in milliseconds, from PING/PONG and HELLO/HELLO_REPLY;
+    /// absent until measured.
+    rtt_ms: Option<f64>,
 }
 
 #[derive(Debug, Serialize, ToSchema)]
@@ -109,6 +112,10 @@ pub(crate) async fn list_peers(
 
     for (public_key, peer_state_mutex) in snapshot {
         let neighbour = crate::swarm::topology::is_neighbour(&state, &public_key);
+        let rtt_ms = state
+            .lock_rtt()
+            .get(&public_key)
+            .map(|rtt| rtt.as_secs_f64() * 1000.0);
         let ps = peer_state_mutex.lock().await;
 
         let (status, dormant_for_secs) = match ps.liveness {
@@ -133,6 +140,7 @@ pub(crate) async fn list_peers(
             same_epoch: ps.epoch.map(|epoch| epoch == local_epoch),
             heads: ps.reported_heads,
             neighbour,
+            rtt_ms,
         });
     }
 
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