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/*
This file is part of cpp-ethereum.
cpp-ethereum is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
cpp-ethereum is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file RLPXperimental.h
* @author Alex Leverington <nessence@gmail.com>
* @date 2015
*/
#pragma once
#include <libdevcore/Guards.h>
#include "RLPXFrameCoder.h"
#include "RLPXPacket.h"
namespace ba = boost::asio;
namespace bi = boost::asio::ip;
namespace dev
{
namespace p2p
{
/**
* @brief Multiplex packets into encrypted RLPX frames.
* @todo throw when enqueued packet is invalid
* @todo use RLPXFrameInfo
*/
class RLPXFrameWriter
{
/**
* @brief Queue and state for Writer
* Properties are used independently;
* only valid packets should be added to q
* @todo implement as class
*/
struct WriterState
{
std::deque<RLPXPacket> q;
mutable Mutex x;
RLPXPacket* writing = nullptr;
size_t remaining = 0;
bool multiFrame = false;
uint16_t sequence = -1;
};
public:
enum PacketPriority { PriorityLow = 0, PriorityHigh };
static const uint16_t EmptyFrameLength;
static const uint16_t MinFrameDequeLength;
RLPXFrameWriter(uint16_t _protocolType): m_protocolType(_protocolType) {}
RLPXFrameWriter(RLPXFrameWriter const& _s): m_protocolType(_s.m_protocolType) {}
/// Returns total number of queued packets. Thread-safe.
size_t size() const { size_t l; size_t h; DEV_GUARDED(m_q.first.x) h = m_q.first.q.size(); DEV_GUARDED(m_q.second.x) l = m_q.second.q.size(); return l + h; }
/// Moves @_payload output to queue, to be muxed into frames by mux() when network buffer is ready for writing. Thread-safe.
void enque(uint8_t _packetType, RLPStream& _payload, PacketPriority _priority = PriorityLow);
/// Returns number of packets framed and outputs frames to o_bytes. Not thread-safe.
size_t mux(RLPXFrameCoder& _coder, unsigned _size, std::vector<bytes>& o_toWrite);
protected:
/// Moves @_p to queue, to be muxed into frames by mux() when network buffer is ready for writing. Thread-safe.
void enque(RLPXPacket&& _p, PacketPriority _priority = PriorityLow);
private:
uint16_t const m_protocolType; // Protocol Type
std::pair<WriterState, WriterState> m_q; // High, Low frame queues
uint16_t m_sequenceId = 0; // Sequence ID
};
}
}