From 4e53e152f83ecb88fa162e0a18e6832df5a38fef Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Thu, 5 Nov 2026 05:38:20 +0100
Subject: round trips in trees

---
 src/api/dashboard/mod.rs | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

(limited to 'src/api/dashboard')

diff --git a/src/api/dashboard/mod.rs b/src/api/dashboard/mod.rs
index 831df6f..aae514a 100644
--- a/src/api/dashboard/mod.rs
+++ b/src/api/dashboard/mod.rs
@@ -574,30 +574,40 @@ struct TreeQuery {
 }
 
 /// `GET /admin/dashboard/tree?writer=…`: the writer's tree (`swarm::tree`), as this node
-/// computes it from the member list and the links members report (whom each reaches;
-/// one that reports none counts as reaching its neighbours by the member list): every
-/// member's parent, `null` for one without. `404` if the writer isn't a member.
+/// computes it from the member list and the links members report (whom each reaches,
+/// and how far: its round trip, as a bucket, `rtt::bucket`; one that reports none counts
+/// as reaching its neighbours by the member list): every member's parent, `null` for
+/// one without. `404` if the writer isn't a member.
 async fn writer_tree(
     Extension(hub): Extension<Arc<Hub>>,
     Query(query): Query<TreeQuery>,
 ) -> Response {
     let state = &hub.state;
-    let mut reaches: BTreeMap<String, BTreeSet<String>> = state
+    let mut reports: BTreeMap<String, Vec<Link>> = state
         .links
         .replies()
         .into_iter()
-        .map(|(member, _, links)| (member, reached_by(&links)))
+        .map(|(member, _, links)| (member, links))
+        .collect();
+    reports.insert(state.local_id().to_owned(), links::own_links(state).await);
+    let reaches: BTreeMap<&str, BTreeSet<String>> = reports
+        .iter()
+        .map(|(member, links)| (member.as_str(), reached_by(links)))
         .collect();
-    reaches.insert(
-        state.local_id().to_owned(),
-        reached_by(&links::own_links(state).await),
-    );
     let reached = |by: &str, member: &str| {
         reaches
             .get(by)
             .is_none_or(|reached| reached.contains(member))
     };
-    match crate::swarm::tree::whole(state, &query.writer, &reached) {
+    let round_trip = |by: &str, member: &str| {
+        let rtt = reports
+            .get(by)
+            .and_then(|links| links.iter().find(|link| link.peer == member))
+            .and_then(|link| link.rtt_us)
+            .map(|us| std::time::Duration::from_micros(u64::from(us)));
+        crate::swarm::rtt::bucket(rtt, None)
+    };
+    match crate::swarm::tree::whole(state, &query.writer, &reached, &round_trip) {
         Some(parents) => {
             axum::Json(json!({ "writer": query.writer, "parents": parents })).into_response()
         }
-- 
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