Save gas on IsFeeEnabled (backport #2786) (#2814)

improvements: save some gas in fee keeper
cosmos · Nov 23, 2022 · dd2c03e · dd2c03e
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -44,6 +44,8 @@ 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
@@ -121,7 +121,7 @@ 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