1 files changed, 12 insertions, 0 deletions
diff --git a/src/swarm/topology/mod.rs b/src/swarm/topology/mod.rs
index 946fc33..df75f46 100644
--- a/src/swarm/topology/mod.rs
+++ b/src/swarm/topology/mod.rs
@@ -152,6 +152,18 @@ pub(crate) fn neighbours_of(state: &AppState, member: &str) -> Option<BTreeSet<S
         .then(|| view.neighbours_of(state.local_id(), member))
 }
 
+/// The transports `member` is on, by the member list (the schemes of its addresses);
+/// ours as we are on them. None known: empty.
+pub(crate) fn transports_of(state: &AppState, member: &str) -> BTreeSet<String> {
+    let view = state.neighbours.read_or_recover();
+    match view.as_ref() {
+        Some(view) if member == state.local_id() => view.local_transports.clone(),
+        Some(view) => view.transports.get(member).cloned().unwrap_or_default(),
+        None if member == state.local_id() => state.transport.transports().into_iter().collect(),
+        None => BTreeSet::new(),
+    }
+}
+
 impl NeighbourView {
     fn neighbours_of(&self, local: &str, member: &str) -> BTreeSet<String> {
         if member == local {