get swarm RTT from paths

1 files changed, 7 insertions, 0 deletions

diff --git a/src/transport/mod.rs b/src/transport/mod.rs
index f60a9f6..80b71cd 100644
--- a/src/transport/mod.rs
+++ b/src/transport/mod.rs
@@ -649,6 +649,13 @@ pub(crate) trait Transport: Send + Sync {
         None
     }
 
+    /// The smoothed round-trip time of the path messages to `peer` go over, if
+    /// measured (`transport::paths`). By default none.
+    fn rtt(&self, peer: &str) -> Option<std::time::Duration> {
+        let _ = peer;
+        None
+    }
+
     /// Whether the transport answers PINGs with PONGs itself (the paths layer,
     /// `transport::paths`); if not (a bare transport, in tests), the node does. By
     /// default not.