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334 lines
8.5 KiB
334 lines
8.5 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 EthereumPeer.cpp
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#include "EthereumPeer.h"
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#include <chrono>
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#include <libdevcore/Common.h>
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#include <libethcore/Exceptions.h>
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#include <libp2p/Session.h>
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#include "BlockChain.h"
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#include "EthereumHost.h"
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#include "TransactionQueue.h"
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#include "BlockQueue.h"
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using namespace std;
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using namespace dev;
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using namespace dev::eth;
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using namespace p2p;
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EthereumPeer::EthereumPeer(Session* _s, HostCapabilityFace* _h, unsigned _i, CapDesc const& _cap):
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Capability(_s, _h, _i),
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m_sub(host()->downloadMan()),
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m_hashSub(host()->hashDownloadMan()),
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m_peerCapabilityVersion(_cap.second)
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{
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m_peerCapabilityVersion = EthereumHost::c_oldProtocolVersion;
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m_syncHashNumber = host()->chain().number() + 1;
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requestStatus();
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}
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EthereumPeer::~EthereumPeer()
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{
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clog(NetMessageSummary) << "Aborting Sync :-(";
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abortSync();
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}
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void EthereumPeer::abortSync()
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{
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if (isSyncing())
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setIdle();
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}
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EthereumHost* EthereumPeer::host() const
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{
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return static_cast<EthereumHost*>(Capability::hostCapability());
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}
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/*
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* Possible asking/syncing states for two peers:
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*/
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string toString(Asking _a)
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{
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switch (_a)
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{
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case Asking::Blocks: return "Blocks";
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case Asking::Hashes: return "Hashes";
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case Asking::Nothing: return "Nothing";
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case Asking::State: return "State";
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}
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return "?";
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}
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void EthereumPeer::setIdle()
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{
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m_sub.doneFetch();
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m_hashSub.doneFetch();
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setAsking(Asking::Nothing);
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}
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void EthereumPeer::requestStatus()
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{
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if (m_asking != Asking::Nothing)
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clog(NetWarn) << "Bad state: requesting state should be the first action";
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setAsking(Asking::State);
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RLPStream s;
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bool latest = m_peerCapabilityVersion == host()->protocolVersion();
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prep(s, StatusPacket, latest ? 6 : 5)
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<< (latest ? host()->protocolVersion() : EthereumHost::c_oldProtocolVersion)
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<< host()->networkId()
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<< host()->chain().details().totalDifficulty
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<< host()->chain().currentHash()
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<< host()->chain().genesisHash();
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if (latest)
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s << u256(host()->chain().number());
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sealAndSend(s);
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}
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void EthereumPeer::requestHashes()
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{
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if (m_asking == Asking::Blocks)
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return;
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m_syncHashNumber = m_hashSub.nextFetch(c_maxHashesAsk);
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setAsking(Asking::Hashes);
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RLPStream s;
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prep(s, GetBlockHashesByNumberPacket, 2) << m_syncHashNumber << c_maxHashesAsk;
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sealAndSend(s);
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}
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void EthereumPeer::requestHashes(h256 const& _lastHash)
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{
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if (m_asking == Asking::Blocks)
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return;
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setAsking(Asking::Hashes);
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RLPStream s;
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prep(s, GetBlockHashesPacket, 2) << _lastHash << c_maxHashesAsk;
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sealAndSend(s);
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}
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void EthereumPeer::requestBlocks()
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{
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setAsking(Asking::Blocks);
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auto blocks = m_sub.nextFetch(c_maxBlocksAsk);
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if (blocks.size())
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{
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RLPStream s;
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prep(s, GetBlocksPacket, blocks.size());
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for (auto const& i: blocks)
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s << i;
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sealAndSend(s);
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}
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else
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setIdle();
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return;
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}
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void EthereumPeer::setAsking(Asking _a)
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{
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m_asking = _a;
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m_lastAsk = chrono::system_clock::now();
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session()->addNote("ask", _a == Asking::Nothing ? "nothing" : _a == Asking::State ? "state" : _a == Asking::Hashes ? "hashes" : _a == Asking::Blocks ? "blocks" : "?");
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session()->addNote("sync", string(isSyncing() ? "ongoing" : "holding") + (needsSyncing() ? " & needed" : ""));
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}
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void EthereumPeer::tick()
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{
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if (chrono::system_clock::now() - m_lastAsk > chrono::seconds(10) && m_asking != Asking::Nothing)
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// timeout
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session()->disconnect(PingTimeout);
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}
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bool EthereumPeer::isSyncing() const
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{
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return m_asking != Asking::Nothing;
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}
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bool EthereumPeer::interpret(unsigned _id, RLP const& _r)
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{
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try
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{
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switch (_id)
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{
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case StatusPacket:
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{
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m_protocolVersion = _r[0].toInt<unsigned>();
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m_networkId = _r[1].toInt<u256>();
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m_totalDifficulty = _r[2].toInt<u256>();
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m_latestHash = _r[3].toHash<h256>();
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m_genesisHash = _r[4].toHash<h256>();
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if (m_peerCapabilityVersion == host()->protocolVersion())
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{
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m_protocolVersion = host()->protocolVersion();
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m_latestBlockNumber = _r[5].toInt<u256>();
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}
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clog(NetMessageSummary) << "Status:" << m_protocolVersion << "/" << m_networkId << "/" << m_genesisHash << "/" << m_latestBlockNumber << ", TD:" << m_totalDifficulty << "=" << m_latestHash;
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setAsking(Asking::Nothing);
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host()->onPeerStatus(this);
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break;
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}
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case TransactionsPacket:
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{
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host()->onPeerTransactions(this, _r);
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break;
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}
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case GetBlockHashesPacket:
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{
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h256 later = _r[0].toHash<h256>();
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unsigned limit = _r[1].toInt<unsigned>();
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clog(NetMessageSummary) << "GetBlockHashes (" << limit << "entries," << later << ")";
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unsigned c = min<unsigned>(host()->chain().number(later), limit);
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RLPStream s;
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prep(s, BlockHashesPacket, c);
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h256 p = host()->chain().details(later).parent;
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for (unsigned i = 0; i < c && p; ++i, p = host()->chain().details(p).parent)
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s << p;
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sealAndSend(s);
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addRating(0);
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break;
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}
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case GetBlockHashesByNumberPacket:
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{
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u256 number256 = _r[0].toInt<u256>();
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unsigned number = (unsigned) number256;
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unsigned limit = _r[1].toInt<unsigned>();
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clog(NetMessageSummary) << "GetBlockHashesByNumber (" << number << "-" << number + limit << ")";
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RLPStream s;
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if (number <= host()->chain().number())
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{
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unsigned c = min<unsigned>(host()->chain().number() - number + 1, limit);
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prep(s, BlockHashesPacket, c);
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for (unsigned n = number; n < number + c; n++)
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{
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h256 p = host()->chain().numberHash(n);
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s << p;
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}
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}
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else
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prep(s, BlockHashesPacket, 0);
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sealAndSend(s);
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addRating(0);
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break;
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}
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case BlockHashesPacket:
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{
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unsigned itemCount = _r.itemCount();
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clog(NetMessageSummary) << "BlockHashes (" << dec << itemCount << "entries)" << (itemCount ? "" : ": NoMoreHashes");
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if (m_asking != Asking::Hashes)
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{
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clog(NetWarn) << "Peer giving us hashes when we didn't ask for them.";
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break;
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}
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setAsking(Asking::Nothing);
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h256s hashes(itemCount);
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for (unsigned i = 0; i < itemCount; ++i)
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{
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hashes[i] = _r[i].toHash<h256>();
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m_hashSub.noteHash(m_syncHashNumber + i, 1);
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}
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if (m_protocolVersion == host()->protocolVersion())
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host()->onPeerHashes(this, m_syncHashNumber, hashes); // V61+, report hashes by number
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else
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host()->onPeerHashes(this, hashes);
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m_syncHashNumber += itemCount;
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break;
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}
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case GetBlocksPacket:
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{
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unsigned count = _r.itemCount();
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clog(NetMessageSummary) << "GetBlocks (" << dec << count << "entries)";
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if (!count)
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{
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clog(NetImpolite) << "Zero-entry GetBlocks: Not replying.";
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addRating(-10);
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break;
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}
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// return the requested blocks.
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bytes rlp;
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unsigned n = 0;
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for (unsigned i = 0; i < min(count, c_maxBlocks); ++i)
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{
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auto h = _r[i].toHash<h256>();
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if (host()->chain().isKnown(h))
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{
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rlp += host()->chain().block(_r[i].toHash<h256>());
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++n;
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}
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}
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if (count > 20 && n == 0)
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clog(NetWarn) << "all" << count << "unknown blocks requested; peer on different chain?";
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else
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clog(NetMessageSummary) << n << "blocks known and returned;" << (min(count, c_maxBlocks) - n) << "blocks unknown;" << (count > c_maxBlocks ? count - c_maxBlocks : 0) << "blocks ignored";
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addRating(0);
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RLPStream s;
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prep(s, BlocksPacket, n).appendRaw(rlp, n);
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sealAndSend(s);
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break;
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}
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case BlocksPacket:
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{
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if (m_asking != Asking::Blocks)
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clog(NetWarn) << "Peer giving us blocks when we didn't ask for them.";
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else
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{
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setAsking(Asking::Nothing);
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host()->onPeerBlocks(this, _r);
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}
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break;
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}
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case NewBlockPacket:
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{
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host()->onPeerNewBlock(this, _r);
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break;
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}
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case NewBlockHashesPacket:
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{
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unsigned itemCount = _r.itemCount();
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clog(NetMessageSummary) << "BlockHashes (" << dec << itemCount << "entries)" << (itemCount ? "" : ": NoMoreHashes");
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h256s hashes(itemCount);
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for (unsigned i = 0; i < itemCount; ++i)
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hashes[i] = _r[i].toHash<h256>();
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host()->onPeerNewHashes(this, hashes);
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break;
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}
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default:
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return false;
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}
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}
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catch (Exception const& _e)
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{
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clog(NetWarn) << "Peer causing an Exception:" << _e.what() << _r;
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}
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catch (std::exception const& _e)
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{
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clog(NetWarn) << "Peer causing an exception:" << _e.what() << _r;
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}
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return true;
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}
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