Save gas on IsFeeEnabled (#2786)

* Save gas on IsFeeEnabled

* add entry for #2786

Co-authored-by: Carlos Rodriguez <carlos@interchain.io>
(cherry picked from commit bbac2b1)

# Conflicts:
#	CHANGELOG.md

Author: alpe

CHANGELOG.md

@@ -44,6 +44,45 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+<<<<<<< HEAD
+=======
+* (core) [\#2746](https://github.com/cosmos/ibc-go/pull/2746) Allow proof height to be zero for all core IBC `sdk.Msg` types that contain proofs.
+* (light-clients/06-solomachine) [\#2746](https://github.com/cosmos/ibc-go/pull/2746) Discard proofHeight for solo machines and use the solo machine sequence instead.
+* (modules/light-clients/07-tendermint) [\#1713](https://github.com/cosmos/ibc-go/pull/1713) Allow client upgrade proposals to update `TrustingPeriod`. See ADR-026 for context.
+* (modules/core/02-client) [\#1188](https://github.com/cosmos/ibc-go/pull/1188/files) Routing `MsgSubmitMisbehaviour` to `UpdateClient` keeper function. Deprecating `SubmitMisbehaviour` endpoint.
+* (modules/core/02-client) [\#1208](https://github.com/cosmos/ibc-go/pull/1208) Replace `CheckHeaderAndUpdateState` usage in 02-client with calls to `VerifyClientMessage`, `CheckForMisbehaviour`, `UpdateStateOnMisbehaviour` and `UpdateState`. 
+* (modules/light-clients/09-localhost) [\#1187](https://github.com/cosmos/ibc-go/pull/1187/) Removing localhost light client implementation as it is not functional. An upgrade handler is provided in `modules/migrations/v5` to prune `09-localhost` clients and consensus states from the store.
+* [\#1186](https://github.com/cosmos/ibc-go/pull/1186/files) Removing `GetRoot` function from ConsensusState interface in `02-client`. `GetRoot` is unused by core IBC. 
+* (modules/core/02-client) [\#1196](https://github.com/cosmos/ibc-go/pull/1196) Adding VerifyClientMessage to ClientState interface. 
+* (modules/core/02-client) [\#1198](https://github.com/cosmos/ibc-go/pull/1198) Adding UpdateStateOnMisbehaviour to ClientState interface. 
+* (modules/core/02-client) [\#1170](https://github.com/cosmos/ibc-go/pull/1170) Updating `ClientUpdateProposal` to set client state in lightclient implementations `CheckSubstituteAndUpdateState` methods.
+* (modules/core/02-client) [\#1197](https://github.com/cosmos/ibc-go/pull/1197) Adding `CheckForMisbehaviour` to `ClientState` interface. 
+* (modules/core/02-client) [\#1195](https://github.com/cosmos/ibc-go/pull/1210) Removing `CheckHeaderAndUpdateState` from `ClientState` interface & associated light client implementations. 
+* (modules/core/02-client) [\#1189](https://github.com/cosmos/ibc-go/pull/1212) Removing `CheckMisbehaviourAndUpdateState` from `ClientState` interface & associated light client implementations.
+* (modules/core/exported) [\#1206](https://github.com/cosmos/ibc-go/pull/1206) Adding new method `UpdateState` to `ClientState` interface.
+* (modules/core/02-client) [\#1741](https://github.com/cosmos/ibc-go/pull/1741) Emitting a new `upgrade_chain` event upon setting upgrade consensus state.
+* (client) [\#724](https://github.com/cosmos/ibc-go/pull/724) `IsRevisionFormat` and `IsClientIDFormat` have been updated to disallow newlines before the dash used to separate the chainID and revision number, and the client type and client sequence.
+* (02-client/cli) [\#897](https://github.com/cosmos/ibc-go/pull/897) Remove `GetClientID()` from `Misbehaviour` interface. Submit client misbehaviour cli command requires an explicit client id now.
+* (06-solomachine) [\#1972](https://github.com/cosmos/ibc-go/pull/1972) Solo machine implementation of `ZeroCustomFields` fn now panics as the fn is only used for upgrades which solo machine does not support. 
+* (apps/27-interchain-accounts) [\#2102](https://github.com/cosmos/ibc-go/pull/2102) ICS27 controller middleware now supports a nil underlying application. This allows chains to make use of interchain accounts with existing auth mechanisms such as x/group and x/gov.
+* (apps/27-interchain-accounts) [\#2146](https://github.com/cosmos/ibc-go/pull/2146) ICS27 controller now claims the channel capability passed via ibc core, and passes `nil` to the underlying app callback. The channel capability arg in `SendTx` is now ignored and looked up internally.
+* (apps/27-interchain-accounts) [\#2134](https://github.com/cosmos/ibc-go/pull/2134) Adding upgrade handler to ICS27 `controller` submodule for migration of channel capabilities. This upgrade handler migrates ownership of channel capabilities from the underlying application to the ICS27 `controller` submodule.
+* (apps/27-interchain-accounts) [\#2157](https://github.com/cosmos/ibc-go/pull/2157) Adding `IsMiddlewareEnabled` functionality to enforce calls to ICS27 msg server to *not* route to the underlying application.
+* (apps/27-interchain-accounts) [\#2177](https://github.com/cosmos/ibc-go/pull/2177) Adding `IsMiddlewareEnabled` flag to interchain accounts `ActiveChannel` genesis type.
+* (apps/27-interchain-accounts) [\#2140](https://github.com/cosmos/ibc-go/pull/2140) Adding migration handler to ICS27 `controller` submodule to assert ownership of channel capabilities and set middleware enabled flag for existing channels. The ICS27 module consensus version has been bumped from 1 to 2.
+* (core/04-channel) [\#2304](https://github.com/cosmos/ibc-go/pull/2304) Adding `GetAllChannelsWithPortPrefix` function which filters channels based on a provided port prefix.
+* (apps/27-interchain-accounts) [\#2290](https://github.com/cosmos/ibc-go/pull/2290) Changed `DefaultParams` function in `host` submodule to allow all messages by default. Defined a constant named `AllowAllHostMsgs` for `host` module to keep wildcard "*" string which allows all messages.
+* (apps/27-interchain-accounts) [\#2248](https://github.com/cosmos/ibc-go/pull/2248) Adding call to underlying app in `OnChanCloseConfirm` callback of the controller submodule and adding relevant unit tests.
+* (apps/27-interchain-accounts) [\#2251](https://github.com/cosmos/ibc-go/pull/2251) Adding `msgServer` struct to controller submodule that embeds the `Keeper` struct.    
+* (light-clients/06-solomachine) Moving `verifyMisbehaviour` function from update.go to misbehaviour_handle.go.
+* (apps/27-interchain-accounts) [\#2297](https://github.com/cosmos/ibc-go/pull/2297) Adding cli command to generate ICS27 packet data.
+* (modules/core/keeper) [\#1728](https://github.com/cosmos/ibc-go/pull/2399) Updated channel callback errors to include portID & channelID for better identification of errors.
+* [\#2434](https://github.com/cosmos/ibc-go/pull/2478) Removed all `TypeMsg` constants
+* (modules/core/exported) [#1689] (https://github.com/cosmos/ibc-go/pull/2539) Removing `GetVersions` from `ConnectionI` interface.
+* (core/03-connection) [\#2745](https://github.com/cosmos/ibc-go/pull/2745) Adding `ConnectionParams` grpc query and CLI to 03-connection.
+* (apps/29-fee) [\#2786](https://github.com/cosmos/ibc-go/pull/2786) Save gas by checking key existence with `KVStore`'s `Has` method.
+
+>>>>>>> bbac2b1 (Save gas on IsFeeEnabled (#2786))
 ### Features
 
 ### Bug Fixes

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