3

agents/rap-node-agent/mobile/fabricvpn/fabricvpn.go

@@ -243,7 +243,7 @@ func (m *Manager) connect(ctx context.Context, cfg runtimeConfig, cancel context
 	if lastErr == nil {
 		lastErr = fmt.Errorf("no QUIC exit endpoints available")
 	}
-	return lastErr
+	return fmt.Errorf("fabric bootstrap failed after %d endpoint candidates: %w", len(cfg.Endpoints), lastErr)
 }
 
 func (m *Manager) protectedQUICDialer() func(context.Context, string, *tls.Config, *quic.Config) (*quic.Conn, error) {
@@ -447,11 +447,17 @@ func (m *Manager) ControlRequest(payloadJSON string) (string, error) {
 		select {
 		case <-ctx.Done():
 			return "", ctx.Err()
-		case err := <-session.Errors():
+		case err, ok := <-session.Errors():
+			if !ok {
+				return "", fmt.Errorf("fabric control error stream closed")
+			}
 			if err != nil {
 				return "", err
 			}
-		case frame := <-session.Frames():
+		case frame, ok := <-session.Frames():
+			if !ok {
+				return "", fmt.Errorf("fabric control stream closed")
+			}
 			if frame.Type != fabricproto.FrameData || frame.StreamID != mesh.FabricControlForwardQUICStreamID {
 				continue
 			}
@@ -460,7 +466,7 @@ func (m *Manager) ControlRequest(payloadJSON string) (string, error) {
 				return "", err
 			}
 			if response.Error != "" {
-				return "", fmt.Errorf(response.Error)
+				return "", fmt.Errorf("%s", response.Error)
 			}
 			return string(response.Payload), nil
 		}