From 38d0ee929193893d2f2371ee1a61deb854936226 Mon Sep 17 00:00:00 2001
From: yyforyongyu <yy2452@columbia.edu>
Date: Mon, 27 Feb 2023 16:27:10 +0800
Subject: [PATCH] lnd: don't allow lookup when `StoreFinalHtlcResolutions` is
 false

---
 rpcserver.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/rpcserver.go b/rpcserver.go
index 5eef75837..55932e51e 100644
--- a/rpcserver.go
+++ b/rpcserver.go
@@ -3942,6 +3942,11 @@ func (r *rpcServer) ClosedChannels(ctx context.Context,
 func (r *rpcServer) LookupHtlc(ctx context.Context,
 	in *lnrpc.LookupHtlcRequest) (*lnrpc.LookupHtlcResponse, error) {
 
+	if !r.cfg.StoreFinalHtlcResolutions {
+		return nil, status.Error(codes.Unavailable, "cannot lookup "+
+			"with flag --store-final-htlc-resolutions=false")
+	}
+
 	chanID := lnwire.NewShortChanIDFromInt(in.ChanId)
 
 	info, err := r.server.chanStateDB.LookupFinalHtlc(chanID, in.HtlcIndex)