invoicerpc: Allow user specify routing hints.

rpcserver.go

@@ -4745,6 +4745,11 @@ func (r *rpcServer) AddInvoice(ctx context.Context,
 		return nil, err
 	}
 
+	// Convert the passed routing hints to the required format.
+	routeHints, err := invoicesrpc.CreateZpay32HopHints(invoice.RouteHints)
+	if err != nil {
+		return nil, err
+	}
 	addInvoiceData := &invoicesrpc.AddInvoiceData{
 		Memo:            invoice.Memo,
 		Value:           value,
@@ -4753,6 +4758,7 @@ func (r *rpcServer) AddInvoice(ctx context.Context,
 		FallbackAddr:    invoice.FallbackAddr,
 		CltvExpiry:      invoice.CltvExpiry,
 		Private:         invoice.Private,
+		RouteHints:      routeHints,
 	}
 
 	if invoice.RPreimage != nil {