feat: wired up the fee middleware in 'app.go'

app/app.go

@@ -96,6 +96,9 @@ import (
 	icahostkeeper "github.com/cosmos/ibc-go/v7/modules/apps/27-interchain-accounts/host/keeper"
 	icahosttypes "github.com/cosmos/ibc-go/v7/modules/apps/27-interchain-accounts/host/types"
 	icatypes "github.com/cosmos/ibc-go/v7/modules/apps/27-interchain-accounts/types"
+	ibcfee "github.com/cosmos/ibc-go/v7/modules/apps/29-fee"
+	ibcfeekeeper "github.com/cosmos/ibc-go/v7/modules/apps/29-fee/keeper"
+	ibcfeetypes "github.com/cosmos/ibc-go/v7/modules/apps/29-fee/types"
 	"github.com/cosmos/ibc-go/v7/modules/apps/transfer"
 	ibctransferkeeper "github.com/cosmos/ibc-go/v7/modules/apps/transfer/keeper"
 	ibctransfertypes "github.com/cosmos/ibc-go/v7/modules/apps/transfer/types"
@@ -169,6 +172,7 @@ var (
 		transfer.AppModuleBasic{},
 		ica.AppModuleBasic{},
 		vesting.AppModuleBasic{},
+		ibcfee.AppModuleBasic{},
 		consensus.AppModuleBasic{},
 		// this line is used by starport scaffolding # stargate/app/moduleBasic
 	)
@@ -183,6 +187,7 @@ var (
 		stakingtypes.NotBondedPoolName: {authtypes.Burner, authtypes.Staking},
 		govtypes.ModuleName:            {authtypes.Burner},
 		ibctransfertypes.ModuleName:    {authtypes.Minter, authtypes.Burner},
+		ibcfeetypes.ModuleName:         nil,
 		// this line is used by starport scaffolding # stargate/app/maccPerms
 	}
 )
@@ -233,6 +238,7 @@ type App struct {
 	UpgradeKeeper         *upgradekeeper.Keeper
 	ParamsKeeper          paramskeeper.Keeper
 	IBCKeeper             *ibckeeper.Keeper // IBC Keeper must be a pointer in the app, so we can SetRouter on it correctly
+	IBCFeeKeeper          ibcfeekeeper.Keeper
 	EvidenceKeeper        evidencekeeper.Keeper
 	TransferKeeper        ibctransferkeeper.Keeper
 	ICAHostKeeper         icahostkeeper.Keeper
@@ -291,6 +297,7 @@ func New(
 		govtypes.StoreKey, paramstypes.StoreKey, ibcexported.StoreKey, upgradetypes.StoreKey,
 		feegrant.StoreKey, evidencetypes.StoreKey, ibctransfertypes.StoreKey, icahosttypes.StoreKey,
 		capabilitytypes.StoreKey, group.StoreKey, icacontrollertypes.StoreKey, consensusparamtypes.StoreKey,
+		ibcfeetypes.StoreKey,
 		// this line is used by starport scaffolding # stargate/app/storeKey
 	)
 	tkeys := sdk.NewTransientStoreKeys(paramstypes.TStoreKey)
@@ -442,20 +449,32 @@ func New(
 		scopedIBCKeeper,
 	)
 
+	// IBC Fee Module keeper
+	app.IBCFeeKeeper = ibcfeekeeper.NewKeeper(
+		appCodec, keys[ibcfeetypes.StoreKey],
+		app.IBCKeeper.ChannelKeeper, // may be replaced with IBC middleware
+		app.IBCKeeper.ChannelKeeper,
+		&app.IBCKeeper.PortKeeper, app.AccountKeeper, app.BankKeeper,
+	)
+
 	// Create Transfer Keepers
 	app.TransferKeeper = ibctransferkeeper.NewKeeper(
 		appCodec,
 		keys[ibctransfertypes.StoreKey],
 		app.GetSubspace(ibctransfertypes.ModuleName),
-		app.IBCKeeper.ChannelKeeper,
+		app.IBCFeeKeeper,
 		app.IBCKeeper.ChannelKeeper,
 		&app.IBCKeeper.PortKeeper,
 		app.AccountKeeper,
 		app.BankKeeper,
 		scopedTransferKeeper,
 	)
 	transferModule := transfer.NewAppModule(app.TransferKeeper)
-	transferIBCModule := transfer.NewIBCModule(app.TransferKeeper)
+
+	/**** IBC Transfer Stack ****/
+	var transferStack ibcporttypes.IBCModule
+	transferStack = transfer.NewIBCModule(app.TransferKeeper)
+	transferStack = ibcfee.NewIBCMiddleware(transferStack, app.IBCFeeKeeper)
 
 	app.ICAHostKeeper = icahostkeeper.NewKeeper(
 		appCodec, keys[icahosttypes.StoreKey],
@@ -523,7 +542,7 @@ func New(
 	// Create static IBC router, add transfer route, then set and seal it
 	ibcRouter := ibcporttypes.NewRouter()
 	ibcRouter.AddRoute(icahosttypes.SubModuleName, icaHostIBCModule).
-		AddRoute(ibctransfertypes.ModuleName, transferIBCModule)
+		AddRoute(ibctransfertypes.ModuleName, transferStack)
 	// this line is used by starport scaffolding # ibc/app/router
 	app.IBCKeeper.SetRouter(ibcRouter)
 
@@ -573,6 +592,7 @@ func New(
 		ibc.NewAppModule(app.IBCKeeper),
 		params.NewAppModule(app.ParamsKeeper),
 		transferModule,
+		ibcfee.NewAppModule(app.IBCFeeKeeper),
 		icaModule,
 		// this line is used by starport scaffolding # stargate/app/appModule
 
@@ -599,6 +619,7 @@ func New(
 		ibctransfertypes.ModuleName,
 		ibcexported.ModuleName,
 		icatypes.ModuleName,
+		ibcfeetypes.ModuleName,
 		genutiltypes.ModuleName,
 		authz.ModuleName,
 		feegrant.ModuleName,
@@ -616,6 +637,7 @@ func New(
 		ibctransfertypes.ModuleName,
 		ibcexported.ModuleName,
 		icatypes.ModuleName,
+		ibcfeetypes.ModuleName,
 		capabilitytypes.ModuleName,
 		authtypes.ModuleName,
 		banktypes.ModuleName,
@@ -653,6 +675,7 @@ func New(
 		ibctransfertypes.ModuleName,
 		ibcexported.ModuleName,
 		icatypes.ModuleName,
+		ibcfeetypes.ModuleName,
 		evidencetypes.ModuleName,
 		authz.ModuleName,
 		feegrant.ModuleName,