loopd call swapserver with SwapPublicationDeadline set

interface.go

@@ -99,6 +99,10 @@ type LoopOutQuoteRequest struct {
 	// client sweep tx.
 	SweepConfTarget int32
 
+	// SwapPublicationDeadline can be set by the client to allow the server
+	// delaying publication of the swap HTLC to save on chain fees.
+	SwapPublicationDeadline time.Time
+
 	// TODO: Add argument to specify confirmation target for server
 	// publishing htlc. This may influence the swap fee quote, because the
 	// server needs to pay more for faster confirmations.

loopd/swapclient_server.go

@@ -266,6 +266,9 @@ func (s *swapClientServer) LoopOutQuote(ctx context.Context,
 	quote, err := s.impl.LoopOutQuote(ctx, &loop.LoopOutQuoteRequest{
 		Amount:          btcutil.Amount(req.Amt),
 		SweepConfTarget: confTarget,
+		SwapPublicationDeadline: time.Unix(
+			int64(req.SwapPublicationDeadline), 0,
+		),
 	})
 	if err != nil {
 		return nil, err