From d8800e5cdd1cec38f295473e51032667ff6d023b Mon Sep 17 00:00:00 2001
From: "mergify[bot]" <37929162+mergify[bot]@users.noreply.github.com>
Date: Wed, 23 Nov 2022 09:34:03 +0100
Subject: [PATCH] Save gas on IsFeeEnabled (backport #2786) (#2816)

improvements: save some gas in fee keeper
---
 CHANGELOG.md                         | 2 ++
 modules/apps/29-fee/keeper/keeper.go | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6c90c148495..4a4540c2d20 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -46,6 +46,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+* (apps/29-fee) [\#2786](https://github.com/cosmos/ibc-go/pull/2786) Save gas by checking key existence with `KVStore`'s `Has` method.
+
 ### Features
 
 ### Bug Fixes
diff --git a/modules/apps/29-fee/keeper/keeper.go b/modules/apps/29-fee/keeper/keeper.go
index 6136ad22229..1bd7e2f1d3e 100644
--- a/modules/apps/29-fee/keeper/keeper.go
+++ b/modules/apps/29-fee/keeper/keeper.go
@@ -122,7 +122,7 @@ func (k Keeper) DeleteFeeEnabled(ctx sdk.Context, portID, channelID string) {
 // fee enabled flag for the given port and channel identifiers
 func (k Keeper) IsFeeEnabled(ctx sdk.Context, portID, channelID string) bool {
 	store := ctx.KVStore(k.storeKey)
-	return store.Get(types.KeyFeeEnabled(portID, channelID)) != nil
+	return store.Has(types.KeyFeeEnabled(portID, channelID))
 }
 
 // GetAllFeeEnabledChannels returns a list of all ics29 enabled channels containing portID & channelID that are stored in state