From 8366f7c5de474753dbfbf88431917e79c15e5389 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Tue, 3 Nov 2026 05:21:25 +0100
Subject: replace eager links by trees

---
 src/swarm/sync.rs | 18 +++++-------------
 1 file changed, 5 insertions(+), 13 deletions(-)

(limited to 'src/swarm/sync.rs')

diff --git a/src/swarm/sync.rs b/src/swarm/sync.rs
index 403e0c1..187dacc 100644
--- a/src/swarm/sync.rs
+++ b/src/swarm/sync.rs
@@ -376,12 +376,11 @@ pub(crate) async fn handle_sync(
         let clock = Arc::clone(&state.clock);
         let ahead_ms = state.clock_ahead_ms.load(Ordering::Relaxed);
 
-        // Some((caught_up, heads changed, a duplicate)) when applied, None when the
-        // message belongs to another epoch.
-        tokio::task::spawn_blocking(move || -> Result<Option<(bool, bool, bool)>> {
+        // Some((caught_up, heads changed)) when applied, None when the message belongs
+        // to another epoch.
+        tokio::task::spawn_blocking(move || -> Result<Option<(bool, bool)>> {
             // Before the lock: decoding a large message takes a while.
             let message = crate::document::sync::decode(&message)?;
-            let carries_changes = message.carries_changes();
             let mut replica = doc.blocking_write();
 
             // Authoritative check, under the same lock as the apply: the document may
@@ -411,9 +410,6 @@ pub(crate) async fn handle_sync(
             let heads_after = replica.heads().to_vec();
             stats.heads_seen(heads_after.len());
             let changed = heads_after != heads_before;
-            // Changes we had already, over a link we asked to be eager: the link isn't
-            // needed (`relay::prune`).
-            let duplicate = carries_changes && !changed && peer_state.eager_from;
             if changed && measure_propagation {
                 // Now by the peers' clocks (their median): this node's own clock skew
                 // doesn't count; the writer's still does.
@@ -434,14 +430,13 @@ pub(crate) async fn handle_sync(
                 // before it registered itself).
                 check_caught_up && from_ready && peer_state.sync.have_all_theirs(&replica.doc),
                 changed,
-                duplicate,
             )))
         })
         .await
         .context("Sync task panicked")??
     };
 
-    let Some((caught_up, changed, duplicate)) = applied else {
+    let Some((caught_up, changed)) = applied else {
         debug!(peer = %peer, epoch = %epoch_label, "Dropped sync message from another epoch");
         return Ok(());
     };
@@ -460,10 +455,7 @@ pub(crate) async fn handle_sync(
 
     state.notify_store_changed();
 
-    crate::swarm::relay::pulled(state, peer, changed).await;
-    if duplicate {
-        crate::swarm::relay::prune(state, peer).await;
-    }
+    crate::swarm::relay::pulled(state, peer);
     // Caught up: our other neighbours may lack what the source had.
     if changed || just_caught_up {
         crate::swarm::relay::announce(state, peer, writer.filter(|_| changed)).await;
-- 
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