links member from the view

1 files changed, 10 insertions, 0 deletions

diff --git a/src/swarm/topology/mod.rs b/src/swarm/topology/mod.rs
index 179cf83..b001809 100644
--- a/src/swarm/topology/mod.rs
+++ b/src/swarm/topology/mod.rs
@@ -100,6 +100,16 @@ pub(crate) fn member_list_graph(
     })))
 }
 
+/// Whether `peer` is in the member list, as the view was last computed from it; None
+/// while the view isn't known.
+pub(crate) fn listed(state: &AppState, peer: &str) -> Option<bool> {
+    state
+        .neighbours
+        .read_or_recover()
+        .as_ref()
+        .map(|view| view.members.iter().any(|member| member == peer))
+}
+
 /// Whether the neighbours are computed from the member list yet (before, everyone
 /// counts as a neighbour).
 pub(crate) fn view_known(state: &AppState) -> bool {