text: /*
   * Copyright (c) 2010-2020 OTClient <https://github.com/edubart/otclient>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #ifndef CONNECTION_H
  #define CONNECTION_H
  
  #include <asio/streambuf.hpp>
  
  #include "declarations.h"
  #include <framework/luaengine/luaobject.h>
  
  class Connection : public LuaObject
  {
      using ErrorCallback = std::function<void(const std::error_code&)>;
      using RecvCallback = std::function<void(uint8*, uint16)>;
  
      enum
      {
          READ_TIMEOUT = 30,
          WRITE_TIMEOUT = 30,
          SEND_BUFFER_SIZE = 65536,
          RECV_BUFFER_SIZE = 65536
      };
  
  public:
      Connection();
      ~Connection() override;
  
      static void poll();
      static void terminate();
  
      void connect(const std::string& host, uint16 port, const std::function<void()>& connectCallback);
      void close();
  
      void write(uint8* buffer, size_t size);
      void read(uint16 bytes, const RecvCallback& callback);
      void read_until(const std::string& what, const RecvCallback& callback);
      void read_some(const RecvCallback& callback);
  
      void setErrorCallback(const ErrorCallback& errorCallback) { m_errorCallback = errorCallback; }
  
      int getIp();
      std::error_code getError() { return m_error; }
      bool isConnecting() { return m_connecting; }
      bool isConnected() { return m_connected; }
      ticks_t getElapsedTicksSinceLastRead() { return m_connected ? m_activityTimer.elapsed_millis() : -1; }
  
      ConnectionPtr asConnection() { return static_self_cast<Connection>(); }
  
  protected:
      void internal_connect(const asio::ip::basic_resolver<asio::ip::tcp>::iterator& endpointIterator);
      void internal_write();
      void onResolve(const std::error_code& error, const asio::ip::tcp::resolver::iterator& endpointIterator);
      void onConnect(const std::error_code& error);
      void onCanWrite(const std::error_code& error);
      void onWrite(const std::error_code& error, size_t writeSize, const std::shared_ptr<asio::streambuf>&
                   outputStream);
      void onRecv(const std::error_code& error, size_t recvSize);
      void onTimeout(const std::error_code& error);
      void handleError(const std::error_code& error);
  
      std::function<void()> m_connectCallback;
      ErrorCallback m_errorCallback;
      RecvCallback m_recvCallback;
  
      asio::basic_waitable_timer<std::chrono::high_resolution_clock> m_readTimer;
      asio::basic_waitable_timer<std::chrono::high_resolution_clock> m_writeTimer;
      asio::basic_waitable_timer<std::chrono::high_resolution_clock> m_delayedWriteTimer;
      asio::ip::tcp::resolver m_resolver;
      asio::ip::tcp::socket m_socket;
  
      static std::list<std::shared_ptr<asio::streambuf>> m_outputStreams;
      std::shared_ptr<asio::streambuf> m_outputStream;
      asio::streambuf m_inputStream;
      bool m_connected;
      bool m_connecting;
      std::error_code m_error;
      stdext::timer m_activityTimer;
  
      friend class Server;
  };
  
  #endif
  