Remove channel ids from invoice description

It's no longer accurate anyway and never was
because invoices were reused.

main.go

@@ -119,37 +119,22 @@ func tryRebalance(ctx context.Context, r *regolancer, attempt *int) (err error,
 		return err, true
 	}
 	routeCtxCancel()
-	invoice, err := r.createInvoice(ctx, from, to, amt)
-	if err != nil {
-		log.Printf("Error creating invoice: %s", err)
-		return err, true
-	}
-	defer func() {
-		if ctx.Err() == context.DeadlineExceeded {
-			r.invalidateInvoice(amt)
-		}
-	}()
 	for _, route := range routes {
 		log.Printf("Attempt %s, amount: %s (max fee: %s)",
 			hiWhiteColorF("#%d", *attempt), hiWhiteColor(amt), formatFee(fee))
 		r.printRoute(ctx, route)
-		err = r.pay(ctx, invoice, amt, params.MinAmount, route, params.ProbeSteps)
+		err = r.pay(ctx, amt, params.MinAmount, route, params.ProbeSteps)
 		if err == nil {
 			return nil, false
 		}
 		if retryErr, ok := err.(ErrRetry); ok {
 			amt = retryErr.amount
 			log.Printf("Trying to rebalance again with %s", hiWhiteColor(amt))
-			probedInvoice, err := r.createInvoice(ctx, from, to, amt)
-			if err != nil {
-				log.Printf("Error creating invoice: %s", err)
-				return err, true
-			}
 			probedRoute, err := r.rebuildRoute(ctx, route, amt)
 			if err != nil {
 				log.Printf("Error rebuilding the route for probed payment: %s", errColor(err))
 			} else {
-				err = r.pay(ctx, probedInvoice, amt, 0, probedRoute, 0)
+				err = r.pay(ctx, amt, 0, probedRoute, 0)
 				if err == nil {
 					return nil, false
 				} else {

payment.go

@@ -21,13 +21,13 @@ func (e ErrRetry) Error() string {
 
 var ErrProbeFailed = fmt.Errorf("probe failed")
 
-func (r *regolancer) createInvoice(ctx context.Context, from, to uint64, amount int64) (result *lnrpc.AddInvoiceResponse, err error) {
+func (r *regolancer) createInvoice(ctx context.Context, amount int64) (result *lnrpc.AddInvoiceResponse, err error) {
 	var ok bool
 	if result, ok = r.invoiceCache[amount]; ok {
 		return
 	}
 	result, err = r.lnClient.AddInvoice(ctx, &lnrpc.Invoice{Value: amount,
-		Memo:   fmt.Sprintf("Rebalance %d ⇒ %d", from, to),
+		Memo:   "Rebalance attempt",
 		Expiry: int64(time.Hour.Seconds() * 24)})
 	r.invoiceCache[amount] = result
 	return
@@ -37,10 +37,20 @@ func (r *regolancer) invalidateInvoice(amount int64) {
 	delete(r.invoiceCache, amount)
 }
 
-func (r *regolancer) pay(ctx context.Context, invoice *lnrpc.AddInvoiceResponse,
-	amount int64, minAmount int64, route *lnrpc.Route, probeSteps int) error {
+func (r *regolancer) pay(ctx context.Context, amount int64, minAmount int64,
+	route *lnrpc.Route, probeSteps int) error {
 	fmt.Println()
 	defer fmt.Println()
+	invoice, err := r.createInvoice(ctx, amount)
+	if err != nil {
+		log.Printf("Error creating invoice: %s", err)
+		return err
+	}
+	defer func() {
+		if ctx.Err() == context.DeadlineExceeded {
+			r.invalidateInvoice(amount)
+		}
+	}()
 	lastHop := route.Hops[len(route.Hops)-1]
 	lastHop.MppRecord = &lnrpc.MPPRecord{
 		PaymentAddr:  invoice.PaymentAddr,