Merge pull request #5768 from priyanshiiit/lookupInvoice

lnd: adds NOT_FOUND status code for LookupInvoice

docs/release-notes/release-notes-0.14.0.md

@@ -105,6 +105,8 @@ proposed channel type is used.
   allows external tools to hook into `lnd`'s RPC server and intercept any
   requests made with custom macaroons (and also the responses to those
   requests).
+  
+* [Adds NOT_FOUND status code for LookupInvoice](https://github.com/lightningnetwork/lnd/pull/5768)
 
 ### Batched channel funding
 
@@ -393,6 +395,7 @@ change](https://github.com/lightningnetwork/lnd/pull/5613).
 * Martin Habovstiak
 * Naveen Srinivasan
 * Oliver Gugger
+* Priyansh Rastogi
 * Wilmer Paulino
 * xanoni
 * Yong Yu

rpcserver.go

@@ -5101,7 +5101,10 @@ func (r *rpcServer) LookupInvoice(ctx context.Context,
 	rpcsLog.Tracef("[lookupinvoice] searching for invoice %x", payHash[:])
 
 	invoice, err := r.server.invoices.LookupInvoice(payHash)
-	if err != nil {
+	switch {
+	case err == channeldb.ErrInvoiceNotFound:
+		return nil, status.Error(codes.NotFound, err.Error())
+	case err != nil:
 		return nil, err
 	}