Merge pull request #153 from dazzling-no-more/feature/connect_data

feat(tunnel): save one RTT per new HTTPS flow via connect_data op

Author: therealaleph

assets/apps_script/CodeFull.gs

@@ -56,6 +56,12 @@ function _doTunnel(req) {
       payload.host = req.h;
       payload.port = req.p;
       break;
+    case "connect_data":
+      payload.op = "connect_data";
+      payload.host = req.h;
+      payload.port = req.p;
+      if (req.d) payload.data = req.d;
+      break;
     case "data":
       payload.op = "data";
       payload.sid = req.sid;
@@ -66,7 +72,10 @@ function _doTunnel(req) {
       payload.sid = req.sid;
       break;
     default:
-      return _json({ e: "unknown tunnel op: " + req.t });
+      // Structured `code` lets the Rust client detect version skew
+      // without substring-matching the error text. Must match
+      // CODE_UNSUPPORTED_OP in tunnel_client.rs and tunnel-node/src/main.rs.
+      return _json({ e: "unknown tunnel op: " + req.t, code: "UNSUPPORTED_OP" });
   }
 
   var resp = UrlFetchApp.fetch(TUNNEL_SERVER_URL + "/tunnel", {

src/domain_fronter.rs

@@ -185,6 +185,11 @@ pub struct TunnelResponse {
     pub eof: Option<bool>,
     #[serde(default)]
     pub e: Option<String>,
+    /// Structured error code from the tunnel-node (e.g. `UNSUPPORTED_OP`).
+    /// `None` for legacy tunnel-nodes; clients should fall back to parsing
+    /// `e` only when this is `None` and compatibility is needed.
+    #[serde(default)]
+    pub code: Option<String>,
 }
 
 /// A single op in a batch tunnel request.