OpenSpace/include/openspace/network/parallelconnection.h

/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2015                                                               *
 *                                                                                       *
 * 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 __PARALLELCONNECTION_H__
#define __PARALLELCONNECTION_H__

//openspace includes
#include <openspace/scripting/scriptengine.h>
#include <openspace/util/powerscaledcoordinate.h>

//glm includes
#include <glm/gtx/quaternion.hpp>

//std includes
#include <string>
#include <vector>
#include <atomic>
#include <thread>
#include <sstream>
#include <mutex>

#ifdef __WIN32__
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#endif

#if defined(__WIN32__) || defined(__MING32__) || defined(__MING64__)
typedef size_t _SOCKET;
#else
typedef int _SOCKET;
#include <netdb.h>
#endif

namespace openspace{
    
    namespace network{
        
        struct StreamDataKeyframe{
            glm::quat _viewRotationQuat;
            psc _position;
            double _timeStamp;
            
            void serialize(std::vector<char> &buffer){
                //add position
                buffer.insert(buffer.end(), reinterpret_cast<char*>(&_position), reinterpret_cast<char*>(&_position) + sizeof(_position));
                
                //add orientation
                buffer.insert(buffer.end(), reinterpret_cast<char*>(&_viewRotationQuat), reinterpret_cast<char*>(&_viewRotationQuat) + sizeof(_viewRotationQuat));
                
                //add timestamp
                buffer.insert(buffer.end(), reinterpret_cast<char*>(&_timeStamp), reinterpret_cast<char*>(&_timeStamp) + sizeof(_timeStamp));
            };
            
            void deserialize(const std::vector<char> &buffer){
                int offset = 0;
                int size = 0;
                
                //position
                size = sizeof(_position);
                memcpy(&_position, buffer.data() + offset, size);
                offset += size;
                
                //orientation
                size = sizeof(_viewRotationQuat);
                memcpy(&_viewRotationQuat, buffer.data() + offset, size);
                offset += size;
                
                //timestamp
                size = sizeof(_timeStamp);
                memcpy(&_timeStamp, buffer.data() + offset, size);
            };
        };

        class ParallelConnection{
        public:
            
            ParallelConnection();
            
            ~ParallelConnection();
            
            void clientConnect();
            
            void disconnect();
            
            void setPort(const std::string &port);
            
            std::string port();
            
            void setAddress(const std::string &address);
            
            std::string address();
            
            void setName(const std::string& name);
            
            std::string name();
            
            _SOCKET clientSocket();
            
            bool isHost();
            
            void requestHostship();

			void setPassword(const std::string &password);
            
            void sendScript(const std::string script);
            
            enum MessageTypes{
                Authentication=0,
                Initialization,
                StreamData,
                Script,
                HostInfo,
                InitializationRequest,
                HostshipRequest
            };
            
            /**
             * Returns the Lua library that contains all Lua functions available to affect the
             * remote OS parallel connection. The functions contained are
             * -
             * \return The Lua library that contains all Lua functions available to affect the
             * interaction
             */
            static scripting::ScriptEngine::LuaLibrary luaLibrary();
            
        protected:
            
        private:
			//@TODO change this into the ghoul hasher for client AND server
			uint32_t hash(const std::string &val){
				uint32_t hashVal = 0, i;
				size_t len = val.length();

				for (hashVal = i = 0; i < len; ++i){
					hashVal += val.c_str()[i];
					hashVal += (hashVal << 10);
					hashVal ^= (hashVal >> 6);
				}

				hashVal += (hashVal << 3);
				hashVal ^= (hashVal >> 11);
				hashVal += (hashVal << 15);

				return hashVal;
			};
            
            void writeHeader(std::vector<char> &buffer, uint32_t messageType);

			void closeSocket();

			bool initNetworkAPI();

			void tryConnect(addrinfo *info);

			void sendAuthentication();

			void listenCommunication();

			void delegateDecoding(uint32_t type);

			void decodeInitializationMessage();

			void decodeStreamDataMessage();
            
            void decodeScriptMessage();

			void decodeHostInfoMessage();
			
			void decodeInitializationRequestMessage();

			void broadcast();
            
            int headerSize();

            int receiveData(_SOCKET & socket, std::vector<char> &buffer, int length, int flags);
            
			uint32_t _passCode;
            std::string _port;
            std::string _address;
            std::string _name;
            _SOCKET _clientSocket;
            std::thread *_connectionThread;
			std::thread *_broadcastThread;
            std::atomic<bool> _isHost;
            std::atomic<bool> _isConnected;
            std::atomic<bool> _isListening;
            std::vector<std::string> _sentScripts;
            std::mutex _sentScriptsMutex;
        };
    } // namespace network
    
} // namespace openspace

#endif // __OSPARALLELCONNECTION_H__