Fee Middleware: Add ICS4 wrapper

modules/apps/29-fee/keeper/escrow.go

@@ -17,6 +17,7 @@ func (k Keeper) EscrowPacketFee(ctx sdk.Context, identifiedFee *types.Identified
 	if err != nil {
 		return err
 	}
+
 	hasRefundAcc := k.authKeeper.GetAccount(ctx, refundAcc)
 	if hasRefundAcc == nil {
 		return sdkerrors.Wrap(types.ErrRefundAccNotFound, fmt.Sprintf("Account with address: %s not found", refundAcc))

modules/apps/29-fee/keeper/keeper.go

@@ -28,6 +28,7 @@ type Keeper struct {
 	cdc      codec.BinaryCodec
 
 	authKeeper    types.AccountKeeper
+	ics4Wrapper   types.ICS4Wrapper
 	channelKeeper types.ChannelKeeper
 	portKeeper    types.PortKeeper
 	bankKeeper    types.BankKeeper
@@ -36,12 +37,13 @@ type Keeper struct {
 // NewKeeper creates a new 29-fee Keeper instance
 func NewKeeper(
 	cdc codec.BinaryCodec, key sdk.StoreKey, paramSpace paramtypes.Subspace,
-	channelKeeper types.ChannelKeeper, portKeeper types.PortKeeper, authKeeper types.AccountKeeper, bankKeeper types.BankKeeper,
+	ics4Wrapper types.ICS4Wrapper, channelKeeper types.ChannelKeeper, portKeeper types.PortKeeper, authKeeper types.AccountKeeper, bankKeeper types.BankKeeper,
 ) Keeper {
 
 	return Keeper{
 		cdc:           cdc,
 		storeKey:      key,
+		ics4Wrapper:   ics4Wrapper,
 		channelKeeper: channelKeeper,
 		portKeeper:    portKeeper,
 		authKeeper:    authKeeper,
@@ -54,11 +56,6 @@ func (k Keeper) Logger(ctx sdk.Context) log.Logger {
 	return ctx.Logger().With("module", "x/"+host.ModuleName+"-"+types.ModuleName)
 }
 
-// ChanCloseInit wraps the channel keeper's function in order to expose it to underlying app.
-func (k Keeper) ChanCloseInit(ctx sdk.Context, portID, channelID string, chanCap *capabilitytypes.Capability) error {
-	return k.channelKeeper.ChanCloseInit(ctx, portID, channelID, chanCap)
-}
-
 // BindPort defines a wrapper function for the port Keeper's function in
 // order to expose it to module's InitGenesis function
 func (k Keeper) BindPort(ctx sdk.Context, portID string) *capabilitytypes.Capability {
@@ -82,7 +79,7 @@ func (k Keeper) GetFeeModuleAddress() sdk.AccAddress {
 
 // SendPacket wraps IBC ChannelKeeper's SendPacket function
 func (k Keeper) SendPacket(ctx sdk.Context, chanCap *capabilitytypes.Capability, packet ibcexported.PacketI) error {
-	return k.channelKeeper.SendPacket(ctx, chanCap, packet)
+	return k.ics4Wrapper.SendPacket(ctx, chanCap, packet)
 }
 
 // SetFeeEnabled sets a flag to determine if fee handling logic should run for the given channel

modules/apps/29-fee/types/expected_keepers.go

@@ -14,12 +14,16 @@ type AccountKeeper interface {
 	GetAccount(sdk.Context, sdk.AccAddress) types.AccountI
 }
 
+// ICS4Wrapper defines the expected ICS4Wrapper for middleware
+type ICS4Wrapper interface {
+	WriteAcknowledgement(ctx sdk.Context, chanCap *capabilitytypes.Capability, packet ibcexported.PacketI, acknowledgement []byte) error
+	SendPacket(ctx sdk.Context, channelCap *capabilitytypes.Capability, packet ibcexported.PacketI) error
+}
+
 // ChannelKeeper defines the expected IBC channel keeper
 type ChannelKeeper interface {
 	GetChannel(ctx sdk.Context, srcPort, srcChan string) (channel channeltypes.Channel, found bool)
 	GetNextSequenceSend(ctx sdk.Context, portID, channelID string) (uint64, bool)
-	SendPacket(ctx sdk.Context, channelCap *capabilitytypes.Capability, packet ibcexported.PacketI) error
-	ChanCloseInit(ctx sdk.Context, portID, channelID string, chanCap *capabilitytypes.Capability) error
 }
 
 // PortKeeper defines the expected IBC port keeper

testing/simapp/app.go

@@ -222,7 +222,6 @@ func NewSimApp(
 	homePath string, invCheckPeriod uint, encodingConfig simappparams.EncodingConfig,
 	appOpts servertypes.AppOptions, baseAppOptions ...func(*baseapp.BaseApp),
 ) *SimApp {
-
 	appCodec := encodingConfig.Marshaler
 	legacyAmino := encodingConfig.Amino
 	interfaceRegistry := encodingConfig.InterfaceRegistry
@@ -323,7 +322,7 @@ func NewSimApp(
 	)
 
 	app.IBCFeeKeeper = ibcfeekeeper.NewKeeper(appCodec, keys[ibcfeetypes.StoreKey], app.GetSubspace(ibcfeetypes.ModuleName),
-		app.IBCKeeper.ChannelKeeper, &app.IBCKeeper.PortKeeper, app.AccountKeeper, app.BankKeeper,
+		app.IBCKeeper.ChannelKeeper, app.IBCKeeper.ChannelKeeper, &app.IBCKeeper.PortKeeper, app.AccountKeeper, app.BankKeeper,
 	)
 
 	// Create Transfer Keeper and pass IBCFeeKeeper as expected Channel and PortKeeper