i2pd/client/I2PService.h

#ifndef I2PSERVICE_H__
#define I2PSERVICE_H__

#include <atomic>
#include <mutex>
#include <unordered_set>
#include <memory>
#include <boost/asio.hpp>
#include "Destination.h"
#include "Identity.h"

namespace i2p
{
namespace client
{
    class I2PServiceHandler;
    class I2PService
    {
        public:
            I2PService (std::shared_ptr<ClientDestination> localDestination  = nullptr);
            I2PService (i2p::data::SigningKeyType kt);
            virtual ~I2PService () { ClearHandlers (); }

            inline void AddHandler (std::shared_ptr<I2PServiceHandler> conn)
            {
                std::unique_lock<std::mutex> l(m_HandlersMutex);
                m_Handlers.insert(conn);
            }
            inline void RemoveHandler (std::shared_ptr<I2PServiceHandler> conn)
            {
                std::unique_lock<std::mutex> l(m_HandlersMutex);
                m_Handlers.erase(conn);
            }
            inline void ClearHandlers ()
            {
                std::unique_lock<std::mutex> l(m_HandlersMutex);
                m_Handlers.clear();
            }

            inline std::shared_ptr<ClientDestination> GetLocalDestination () { return m_LocalDestination; }
            inline void SetLocalDestination (std::shared_ptr<ClientDestination> dest) { m_LocalDestination = dest; }
            void CreateStream (StreamRequestComplete streamRequestComplete, const std::string& dest, int port = 0);

            inline boost::asio::io_service& GetService () { return m_LocalDestination->GetService (); }

            virtual void Start () = 0;
            virtual void Stop () = 0;

            virtual const char* GetName() { return "Generic I2P Service"; }
        private:

            std::shared_ptr<ClientDestination> m_LocalDestination;
            std::unordered_set<std::shared_ptr<I2PServiceHandler> > m_Handlers;
            std::mutex m_HandlersMutex;
    };

    /*Simple interface for I2PHandlers, allows detection of finalization amongst other things */
    class I2PServiceHandler
    {
        public:
            I2PServiceHandler(I2PService * parent) : m_Service(parent), m_Dead(false) { }
            virtual ~I2PServiceHandler() { }
            //If you override this make sure you call it from the children
            virtual void Handle() {}; //Start handling the socket
        protected:
            // Call when terminating or handing over to avoid race conditions
            inline bool Kill () { return m_Dead.exchange(true); }
            // Call to know if the handler is dead
            inline bool Dead () { return m_Dead; }
            // Call when done to clean up (make sure Kill is called first)
            inline void Done (std::shared_ptr<I2PServiceHandler> me) { if(m_Service) m_Service->RemoveHandler(me); }
            // Call to talk with the owner
            inline I2PService * GetOwner() { return m_Service; }
        private:
            I2PService *m_Service;
            std::atomic<bool> m_Dead; //To avoid cleaning up multiple times
    };

    /* TODO: support IPv6 too */
    //This is a service that listens for connections on the IP network and interacts with I2P
    class TCPIPAcceptor: public I2PService
    {
        public:
            TCPIPAcceptor(const std::string& address, int port, std::shared_ptr<ClientDestination> localDestination = nullptr)
                : I2PService(localDestination), m_Acceptor(GetService(), boost::asio::ip::tcp::endpoint(boost::asio::ip::address::from_string(address), port)),
                  m_Timer (GetService()) {}
            TCPIPAcceptor(const std::string& address, int port, i2p::data::SigningKeyType kt)
                : I2PService(kt), m_Acceptor(GetService(), boost::asio::ip::tcp::endpoint(boost::asio::ip::address::from_string(address), port)),
                  m_Timer(GetService()) {}
            virtual ~TCPIPAcceptor () { TCPIPAcceptor::Stop(); }
            //If you override this make sure you call it from the children
            void Start ();
            //If you override this make sure you call it from the children
            void Stop ();
        protected:
            virtual std::shared_ptr<I2PServiceHandler> CreateHandler(std::shared_ptr<boost::asio::ip::tcp::socket> socket) = 0;
            virtual const char* GetName() { return "Generic TCP/IP accepting daemon"; }
        private:
            void Accept();
            void HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<boost::asio::ip::tcp::socket> socket);
            boost::asio::ip::tcp::acceptor m_Acceptor;
            boost::asio::deadline_timer m_Timer;
    };
}
}

#endif