1 files changed, 51 insertions, 0 deletions
diff --git a/src/transport/mod.rs b/src/transport/mod.rs
index 3f77306..10a8ae5 100644
--- a/src/transport/mod.rs
+++ b/src/transport/mod.rs
@@ -18,6 +18,7 @@ pub(crate) mod mycelium;
 pub(crate) mod p2p;
 #[cfg(test)]
 pub(crate) mod sim;
+pub(crate) mod stats;
 pub(crate) mod traffic;
 pub(crate) mod wire;
 
@@ -330,6 +331,37 @@ pub(crate) struct ListedPeer {
     pub(crate) addresses: Vec<String>,
 }
 
+/// Where messages to a peer go now (`Transport::destination`).
+#[derive(Debug, Clone, PartialEq, Eq, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub(crate) struct Destination {
+    /// As the identity layer keeps it: `<scheme>:<transport identity>`.
+    pub(crate) address: String,
+    /// The peer proved itself there; else it is only said to be there, and sends wait
+    /// for its proof.
+    pub(crate) proven: bool,
+    /// The transport's connection to it, if the transport has connections.
+    pub(crate) connection: Option<Connection>,
+}
+
+/// How a transport with connections (libp2p) is connected to a peer.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub(crate) enum Connection {
+    Direct,
+    /// Only through a relay.
+    Relayed,
+}
+
+impl Connection {
+    pub(crate) fn as_str(self) -> &'static str {
+        match self {
+            Self::Direct => "direct",
+            Self::Relayed => "relayed",
+        }
+    }
+}
+
 #[derive(Clone, Serialize, Deserialize)]
 pub(crate) struct HelloReply {
     pub(crate) swarm_id: String,
@@ -584,6 +616,25 @@ pub(crate) trait Transport: Send + Sync {
         let _ = (peer, addresses);
     }
 
+    /// Where messages to `peer` go now. None if nowhere, and by default, for a
+    /// transport whose identities are addresses (`peer` is where they go).
+    fn destination(&self, peer: &str) -> Option<Destination> {
+        let _ = peer;
+        None
+    }
+
+    /// How this node is connected to `target` (a transport identity), if it is. By
+    /// default not at all, for a transport without connections (Mycelium).
+    fn connection(&self, target: &str) -> Option<Connection> {
+        let _ = target;
+        None
+    }
+
+    /// Figures about the transport itself (`stats`). By default none.
+    fn stats(&self) -> stats::TransportStats {
+        stats::TransportStats::default()
+    }
+
     /// Resolves a seed (anything that leads to a node, e.g. an address) to that node's
     /// identity, as `local_id` gives it on that node.
     async fn resolve_seed(&self, seed: &str) -> Result<String>;