debug_link.hpp

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// Copyright (c) 2017-2018, The Electroneum Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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#ifndef ELECTRONEUM_DEBUG_LINK_H
#define ELECTRONEUM_DEBUG_LINK_H
 
#include "transport.hpp"
#include "messages/messages-debug.pb.h"
 
 
namespace hw {
namespace trezor {
 
  class DebugLink {
  public:
 
    DebugLink();
    virtual ~DebugLink();
 
    void init(std::shared_ptr<Transport> & transport);
    void close();
 
    std::shared_ptr<messages::debug::DebugLinkState> state();
    void input_word(const std::string & word);
    void input_button(bool button);
    void input_swipe(bool swipe);
    void press_yes() { input_button(true); }
    void press_no() { input_button(false); }
    void stop();
 
    template<class t_message=messages::debug::DebugLinkState>
    std::shared_ptr<t_message> call(
        const google::protobuf::Message & req,
        const boost::optional<messages::MessageType> &resp_type = boost::none,
        bool no_wait = false)
    {
      BOOST_STATIC_ASSERT(boost::is_base_of<google::protobuf::Message, t_message>::value);
 
      m_transport->write(req);
      if (no_wait){
        return nullptr;
      }
 
      // Read the response
      std::shared_ptr<google::protobuf::Message> msg_resp;
      hw::trezor::messages::MessageType msg_resp_type;
      m_transport->read(msg_resp, &msg_resp_type);
 
      messages::MessageType required_type = resp_type ? resp_type.get() : MessageMapper::get_message_wire_number<t_message>();
      if (msg_resp_type == required_type) {
        return message_ptr_retype<t_message>(msg_resp);
      } else if (msg_resp_type == messages::MessageType_Failure){
        throw_failure_exception(dynamic_cast<messages::common::Failure*>(msg_resp.get()));
      } else {
        throw exc::UnexpectedMessageException(msg_resp_type, msg_resp);
      }
    };
 
  private:
    std::shared_ptr<Transport> m_transport;
 
  };
 
}
}
 
#endif //ELECTRONEUM_DEBUG_LINK_H