Trace ticket reattach recovery

src/bin/dosh-server.rs

@@ -1463,6 +1463,7 @@ async fn handle_ticket_attach(
     peer: SocketAddr,
     body: Vec<u8>,
 ) -> Result<()> {
+    dosh::trace::event("server.ticket_attach_start", &[("peer", peer.to_string())]);
     let env: TicketAttachEnvelope = protocol::from_body(&body)?;
     let opened = {
         let locked = state.lock().expect("server state poisoned");
@@ -1486,10 +1487,22 @@ async fn handle_ticket_attach(
     };
     let (ticket, request_plain) = match opened {
         Ok(opened) => opened,
-        Err(err) => return send_reject(socket, peer, &err.to_string()).await,
+        Err(err) => {
+            let reason = err.to_string();
+            dosh::trace::event("server.ticket_attach_reject", &[("reason", reason.clone())]);
+            return send_reject(socket, peer, &reason).await;
+        }
     };
     let req: TicketAttachBody = protocol::from_body(&request_plain)?;
     if req.session != ticket.session || req.mode != ticket.mode {
+        dosh::trace::event(
+            "server.ticket_attach_reject",
+            &[
+                ("session", req.session.clone()),
+                ("mode", req.mode.clone()),
+                ("reason", "ticket scope mismatch".to_string()),
+            ],
+        );
         return send_reject(socket, peer, "ticket scope mismatch").await;
     }
 
@@ -1560,7 +1573,18 @@ async fn handle_ticket_attach(
     };
     let (client_id, output_seq, snapshot) = match attached {
         Ok(attached) => attached,
-        Err(err) => return send_reject(socket, peer, &err.to_string()).await,
+        Err(err) => {
+            let reason = err.to_string();
+            dosh::trace::event(
+                "server.ticket_attach_reject",
+                &[
+                    ("session", req.session.clone()),
+                    ("mode", req.mode.clone()),
+                    ("reason", reason.clone()),
+                ],
+            );
+            return send_reject(socket, peer, &reason).await;
+        }
     };
 
     let ok = AttachOk {
@@ -1591,6 +1615,16 @@ async fn handle_ticket_attach(
     let body = protocol::to_body(&envelope)?;
     let out = protocol::encode_plain(PacketKind::AttachOk, client_id, 1, 0, &body)?;
     let _ = send_udp(socket, &out, peer).await?;
+    dosh::trace::event(
+        "server.ticket_attach_ok",
+        &[
+            ("session", ok.session.clone()),
+            ("mode", ok.mode.clone()),
+            ("client", hex_id(client_id)),
+            ("output_seq", output_seq.to_string()),
+            ("bytes", ok.snapshot.len().to_string()),
+        ],
+    );
     Ok(())
 }