Multiple packets handling

// OnRecvPacket implements the IBCModule interface
func (am AppModule) OnRecvPacket(
  ctx sdk.Context,
  packet channeltypes.Packet,
) (*sdk.Result, []byte, error) {
  var ack channeltypes.Acknowledgement
  var err error

  // Try handling the chain link packet data
  ack, err = am.handleLinkChainAccountPacketData(ctx, packet)
  if types.ErrInvalidPacketData.Is(err) {
    // Try handling the oracle request packet data
    ack, err = am.handleOracleRequestPacketData(ctx, packet)
  }

  // If packet data is still invalid, return an error
  if types.ErrInvalidPacketData.Is(err) {
    return nil, nil, err
  }

  // ...
}

// handleLinkChainAccountPacketData tries handling a LinkChainAccountPacketData packet.
// Returns ErrInvalidPacketData if the given packet data is not of such type.
func (am AppModule) handleLinkChainAccountPacketData(
  ctx sdk.Context, packet channeltypes.Packet,
) (channeltypes.Acknowledgement, error) {
  var packetData types.LinkChainAccountPacketData
  if err := types.ModuleCdc.UnmarshalJSON(packet.GetData(), &packetData); err != nil {
    return channeltypes.Acknowledgement{}, sdkerrors.Wrapf(types.ErrInvalidPacketData, "%T", packet)
  }
  // ...
}

// handleOracleRequestPacketData tries handling a OracleResponsePacketData packet.
// Returns ErrInvalidPacketData if the given packet data is not of such type.
func (am AppModule) handleOracleRequestPacketData(
  ctx sdk.Context, packet channeltypes.Packet,
) (channeltypes.Acknowledgement, error) {
  var data oracletypes.OracleResponsePacketData
  if err := oracletypes.ModuleCdc.UnmarshalJSON(packet.GetData(), &data); err != nil {
    return channeltypes.Acknowledgement{}, sdkerrors.Wrapf(types.ErrInvalidPacketData, "%T", packet)
  }

  // ...
}