i2pd/TunnelBase.h

#ifndef TUNNEL_BASE_H__
#define TUNNEL_BASE_H__

#include <inttypes.h>
#include <memory>
#include "util/Timestamp.h"
#include "I2NPProtocol.h"
#include "Identity.h"

namespace i2p
{
namespace tunnel
{
    const size_t TUNNEL_DATA_MSG_SIZE = 1028;
    const size_t TUNNEL_DATA_ENCRYPTED_SIZE = 1008;
    const size_t TUNNEL_DATA_MAX_PAYLOAD_SIZE = 1003;
    
    enum TunnelDeliveryType 
    { 
        eDeliveryTypeLocal = 0, 
        eDeliveryTypeTunnel = 1,
        eDeliveryTypeRouter = 2
    };      
    struct TunnelMessageBlock
    {
        TunnelDeliveryType deliveryType;
        i2p::data::IdentHash hash;  
        uint32_t tunnelID;
        std::shared_ptr<I2NPMessage> data;
    };

    class TunnelBase
    {
        public:

            //WARNING!!! GetSecondsSinceEpoch() return uint64_t
            TunnelBase (): m_CreationTime (i2p::util::GetSecondsSinceEpoch ()) {};
            virtual ~TunnelBase () {};
            
            virtual void HandleTunnelDataMsg (std::shared_ptr<const i2p::I2NPMessage> tunnelMsg) = 0;
            virtual void SendTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage> msg) = 0;
            virtual void FlushTunnelDataMsgs () {};
            virtual void EncryptTunnelMsg (std::shared_ptr<const I2NPMessage> in, std::shared_ptr<I2NPMessage> out) = 0;
            virtual uint32_t GetNextTunnelID () const = 0;
            virtual const i2p::data::IdentHash& GetNextIdentHash () const = 0;
            virtual uint32_t GetTunnelID () const = 0; // as known at our side

            uint32_t GetCreationTime () const { return m_CreationTime; };
            void SetCreationTime (uint32_t t) { m_CreationTime = t; };

        private:
            
            uint32_t m_CreationTime; // seconds since epoch
    };  

    struct TunnelCreationTimeCmp
    {
        bool operator() (std::shared_ptr<const TunnelBase> t1, std::shared_ptr<const TunnelBase> t2) const
        {   
            if (t1->GetCreationTime () != t2->GetCreationTime ())
                return t1->GetCreationTime () > t2->GetCreationTime (); 
            else
                return t1 < t2;
        };
    };  
}
}

#endif