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112 lines
3.1 KiB
112 lines
3.1 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file RLPXSocketIO.cpp
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* @author Alex Leverington <nessence@gmail.com>
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* @date 2015
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*/
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#include "RLPXSocketIO.h"
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#include <algorithm>
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using namespace std;
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using namespace dev;
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using namespace dev::p2p;
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uint32_t const RLPXSocketIO::MinFrameSize = h128::size * 3; // header + block + mac
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uint32_t const RLPXSocketIO::MaxPacketSize = 1 << 24;
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uint16_t const RLPXSocketIO::DefaultInitialCapacity = 8 << 8;
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RLPXSocketIO::RLPXSocketIO(unsigned _protCount, RLPXFrameCoder& _coder, bi::tcp::socket& _socket, bool _flowControl, size_t _initialCapacity):
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m_flowControl(_flowControl),
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m_coder(_coder),
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m_socket(_socket),
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m_writers(writers(_protCount)),
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m_egressCapacity(m_flowControl ? _initialCapacity : MaxPacketSize * m_writers.size())
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{}
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vector<RLPXFrameWriter> RLPXSocketIO::writers(unsigned _capacity)
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{
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vector<RLPXFrameWriter> ret;
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for (unsigned i = 0; i < _capacity; i++)
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ret.push_back(RLPXFrameWriter(i));
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return ret;
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}
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void RLPXSocketIO::send(unsigned _protocolType, unsigned _type, RLPStream& _payload)
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{
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if (!m_socket.is_open())
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return; // TCPSocketNotOpen
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m_writers.at(_protocolType).enque(_type, _payload);
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bool wasEmtpy = false;
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DEV_GUARDED(x_queued)
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wasEmtpy = (++m_queued == 1);
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if (wasEmtpy)
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doWrite();
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}
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void RLPXSocketIO::doWrite()
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{
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m_toSend.clear();
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size_t capacity;
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DEV_GUARDED(x_queued)
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capacity = min(m_egressCapacity, MaxPacketSize);
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size_t active = 0;
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for (auto const& w: m_writers)
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if (w.size())
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active += 1;
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size_t dequed = 0;
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size_t protFrameSize = capacity / active;
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if (protFrameSize >= MinFrameSize)
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for (auto& w: m_writers)
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dequed += w.mux(m_coder, protFrameSize, m_toSend);
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if (dequed)
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write(dequed);
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else
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deferWrite();
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}
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void RLPXSocketIO::deferWrite()
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{
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auto self(shared_from_this());
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m_congestion.reset(new ba::deadline_timer(m_socket.get_io_service()));
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m_congestion->expires_from_now(boost::posix_time::milliseconds(50));
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m_congestion->async_wait([=](boost::system::error_code const& _ec) { m_congestion.reset(); if (!_ec) doWrite(); });
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}
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void RLPXSocketIO::write(size_t _dequed)
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{
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auto self(shared_from_this());
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ba::async_write(m_socket, ba::buffer(m_toSend), [this, self, _dequed](boost::system::error_code ec, size_t written)
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{
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if (ec)
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return; // TCPSocketWriteError
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bool reschedule = false;
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DEV_GUARDED(x_queued)
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{
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if (m_flowControl)
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m_egressCapacity -= written;
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m_queued -= _dequed;
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reschedule = m_queued > 0;
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}
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if (reschedule)
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doWrite();
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});
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}
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