i2pd/TunnelBase.h

#ifndef TUNNEL_BASE_H__
#define TUNNEL_BASE_H__

#include <inttypes.h>
#include <memory>
#include "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:

			TunnelBase (uint32_t tunnelID, uint32_t nextTunnelID, i2p::data::IdentHash nextIdent): 
				m_TunnelID (tunnelID), m_NextTunnelID (nextTunnelID), m_NextIdent (nextIdent),
				m_CreationTime (i2p::util::GetSecondsSinceEpoch ()) {};
			virtual ~TunnelBase () {};
			virtual void Cleanup () {};
			
			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;
			uint32_t GetNextTunnelID () const { return m_NextTunnelID; };
			const i2p::data::IdentHash& GetNextIdentHash () const { return m_NextIdent; };
			virtual uint32_t GetTunnelID () const { return m_TunnelID; }; // as known at our side

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

			uint32_t m_TunnelID, m_NextTunnelID;
			i2p::data::IdentHash m_NextIdent;
			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