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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 PeerServer.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <map>
#include <vector>
#include <set>
#include <memory>
#include <utility>
#include <thread>
#include <libethcore/CommonEth.h>
#include "PeerNetwork.h"
namespace ba = boost::asio;
namespace bi = boost::asio::ip;
namespace eth
{
class PeerServer
{
friend class PeerSession;
public:
/// Start server, listening for connections on the given port.
PeerServer(std::string const& _clientVersion, BlockChain const& _ch, unsigned int _networkId, unsigned short _port, NodeMode _m = NodeMode::Full, std::string const& _publicAddress = std::string(), bool _upnp = true);
/// Start server, listening for connections on a system-assigned port.
PeerServer(std::string const& _clientVersion, BlockChain const& _ch, unsigned int _networkId, NodeMode _m = NodeMode::Full, std::string const& _publicAddress = std::string(), bool _upnp = true);
/// Start server, but don't listen.
PeerServer(std::string const& _clientVersion, BlockChain const& _ch, unsigned int _networkId, NodeMode _m = NodeMode::Full);
~PeerServer();
static unsigned protocolVersion();
unsigned networkId() { return m_networkId; }
/// Connect to a peer explicitly.
void connect(std::string const& _addr, unsigned short _port = 30303) noexcept;
void connect(bi::tcp::endpoint const& _ep);
/// Sync with the BlockChain. It might contain one of our mined blocks, we might have new candidates from the network.
bool sync(BlockChain& _bc, TransactionQueue&, OverlayDB& _o);
bool sync();
/// Conduct I/O, polling, syncing, whatever.
/// Ideally all time-consuming I/O is done in a background thread or otherwise asynchronously, but you get this call every 100ms or so anyway.
/// This won't touch alter the blockchain.
void process() { if (isInitialised()) m_ioService.poll(); }
/// Set ideal number of peers.
void setIdealPeerCount(unsigned _n) { m_idealPeerCount = _n; }
void setMode(NodeMode _m) { m_mode = _m; }
/// Get peer information.
std::vector<PeerInfo> peers(bool _updatePing = false) const;
/// Get number of peers connected; equivalent to, but faster than, peers().size().
size_t peerCount() const { return m_peers.size(); }
/// Ping the peers, to update the latency information.
void pingAll();
/// Get the port we're listening on currently.
unsigned short listenPort() const { return m_public.port(); }
bytes savePeers() const;
void restorePeers(bytesConstRef _b);
private:
void seal(bytes& _b);
void populateAddresses();
void determinePublic(std::string const& _publicAddress, bool _upnp);
void ensureAccepting();
/// Check to see if the network peer-state initialisation has happened.
bool isInitialised() const { return m_latestBlockSent; }
/// Initialises the network peer-state, doing the stuff that needs to be once-only. @returns true if it really was first.
bool ensureInitialised(BlockChain& _bc, TransactionQueue& _tq);
std::map<Public, bi::tcp::endpoint> potentialPeers();
std::string m_clientVersion;
NodeMode m_mode = NodeMode::Full;
unsigned short m_listenPort;
BlockChain const* m_chain = nullptr;
ba::io_service m_ioService;
bi::tcp::acceptor m_acceptor;
bi::tcp::socket m_socket;
UPnP* m_upnp = nullptr;
bi::tcp::endpoint m_public;
KeyPair m_key;
unsigned m_networkId;
std::map<Public, std::weak_ptr<PeerSession>> m_peers;
std::vector<bytes> m_incomingTransactions;
std::vector<bytes> m_incomingBlocks;
std::vector<bytes> m_unknownParentBlocks;
std::vector<Public> m_freePeers;
std::map<Public, std::pair<bi::tcp::endpoint, unsigned>> m_incomingPeers;
h256 m_latestBlockSent;
std::set<h256> m_transactionsSent;
std::chrono::steady_clock::time_point m_lastPeersRequest;
unsigned m_idealPeerCount = 5;
std::vector<bi::address_v4> m_addresses;
std::vector<bi::address_v4> m_peerAddresses;
bool m_accepting = false;
};
}