added custom pfm middleware to substitue logic on onRecvPacket

custom/packet-forward-middleware/ibc_middleware.go

@@ -0,0 +1,40 @@
+package packetforward
+
+import (
+	"time"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	router "github.com/cosmos/ibc-apps/middleware/packet-forward-middleware/v7/packetforward"
+	"github.com/cosmos/ibc-apps/middleware/packet-forward-middleware/v7/packetforward/keeper"
+	channeltypes "github.com/cosmos/ibc-go/v7/modules/core/04-channel/types"
+	porttypes "github.com/cosmos/ibc-go/v7/modules/core/05-port/types"
+	ibcexported "github.com/cosmos/ibc-go/v7/modules/core/exported"
+)
+
+var _ porttypes.Middleware = &IBCMiddleware{}
+
+// IBCMiddleware implements the ICS26 callbacks for the forward middleware given the
+// forward keeper and the underlying application.
+type IBCMiddleware struct {
+	router.IBCMiddleware
+}
+
+func NewIBCMiddleware(
+	app porttypes.IBCModule,
+	k *keeper.Keeper,
+	retriesOnTimeout uint8,
+	forwardTimeout time.Duration,
+	refundTimeout time.Duration,
+) IBCMiddleware {
+	return IBCMiddleware{
+		IBCMiddleware: router.NewIBCMiddleware(app, k, retriesOnTimeout, forwardTimeout, refundTimeout),
+	}
+}
+
+func (im IBCMiddleware) OnRecvPacket(
+	ctx sdk.Context,
+	packet channeltypes.Packet,
+	relayer sdk.AccAddress,
+) ibcexported.Acknowledgement {
+	return im.IBCMiddleware.OnRecvPacket(ctx, packet, relayer)
+}