From 7c6716358503abee5fab960c45e5fc2de5f61203 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Sat, 7 Nov 2026 22:35:10 +0100
Subject: dashboard: the writers' trees as this node knows them

The tree drawn is computed as every node computes its own part of it:
from the member list, and whom it and its neighbours reach, as they
told it; no longer from the links members report over LINKS.

Auth plan M3 (preparing LINKS' removal).
---
 src/api/dashboard/mod.rs | 44 +++++---------------------------------------
 1 file changed, 5 insertions(+), 39 deletions(-)

(limited to 'src/api')

diff --git a/src/api/dashboard/mod.rs b/src/api/dashboard/mod.rs
index 7d940c9..e86475f 100644
--- a/src/api/dashboard/mod.rs
+++ b/src/api/dashboard/mod.rs
@@ -715,41 +715,16 @@ struct TreeQuery {
     writer: String,
 }
 
-/// `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,
-/// 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.
+/// `GET /admin/dashboard/tree?writer=…`: the writer's tree (`swarm::tree::whole`), as
+/// this node computes it: from the member list, and whom it and its neighbours reach
+/// and how far, as they said (others as reaching their 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 reports: BTreeMap<String, Vec<Link>> = state
-        .links
-        .replies()
-        .into_iter()
-        .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();
-    let reached = |by: &str, member: &str| {
-        reaches
-            .get(by)
-            .is_none_or(|reached| reached.contains(member))
-    };
-    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) {
+    match crate::swarm::tree::whole(state, &query.writer).await {
         Some(parents) => {
             axum::Json(json!({ "writer": query.writer, "parents": parents })).into_response()
         }
@@ -757,15 +732,6 @@ async fn writer_tree(
     }
 }
 
-/// Whom a member reaches, by its links: those neither dormant nor down.
-fn reached_by(links: &[Link]) -> BTreeSet<String> {
-    links
-        .iter()
-        .filter(|link| !link.dormant && !link.down)
-        .map(|link| link.peer.clone())
-        .collect()
-}
-
 /// `GET /admin/dashboard/state`: the latest snapshot, for a client that wants it whole.
 async fn current_state(Extension(hub): Extension<Arc<Hub>>) -> Response {
     hub.want();
-- 
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