channeldb+invoices: track invoices by InvoiceRef

invoices/update.go

@@ -22,10 +22,16 @@ type invoiceUpdateCtx struct {
 	mpp                  *record.MPP
 }
 
+// invoiceRef returns an identifier that can be used to lookup or update the
+// invoice this HTLC is targeting.
+func (i *invoiceUpdateCtx) invoiceRef() channeldb.InvoiceRef {
+	return channeldb.InvoiceRefByHash(i.hash)
+}
+
 // log logs a message specific to this update context.
 func (i *invoiceUpdateCtx) log(s string) {
-	log.Debugf("Invoice(%x): %v, amt=%v, expiry=%v, circuit=%v, mpp=%v",
-		i.hash[:], s, i.amtPaid, i.expiry, i.circuitKey, i.mpp)
+	log.Debugf("Invoice%v: %v, amt=%v, expiry=%v, circuit=%v, mpp=%v",
+		i.invoiceRef, s, i.amtPaid, i.expiry, i.circuitKey, i.mpp)
 }
 
 // failRes is a helper function which creates a failure resolution with