staticaddr: re-sub for invoice on subscription error

Author: hieblmi

staticaddr/loopin/actions.go

@@ -695,6 +695,18 @@ func (f *FSM) MonitorInvoiceAndHtlcTxAction(ctx context.Context,
 		case err = <-invoiceErrChan:
 			f.Errorf("invoice subscription error: %v", err)
 
+			// Re-register for invoice updates.
+			invoiceUpdateChan, invoiceErrChan, err =
+				f.cfg.InvoicesClient.SubscribeSingleInvoice(
+					subscribeCtx, f.loopIn.SwapHash,
+				)
+			if err != nil {
+				err = fmt.Errorf("unable to subscribe to swap "+
+					"invoice: %v", err)
+
+				return f.HandleError(err)
+			}
+
 		case <-ctx.Done():
 			return f.HandleError(ctx.Err())
 		}