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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 EthereumHost.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include "EthereumHost.h"
#include <chrono>
#include <thread>
#include <libdevcore/Common.h>
#include <libp2p/Host.h>
#include <libp2p/Session.h>
#include <libethcore/Exceptions.h>
#include "BlockChain.h"
#include "TransactionQueue.h"
#include "BlockQueue.h"
#include "EthereumPeer.h"
#include "DownloadMan.h"
using namespace std;
using namespace dev;
using namespace dev::eth;
using namespace p2p;
EthereumHost::EthereumHost(BlockChain const& _ch, TransactionQueue& _tq, BlockQueue& _bq, u256 _networkId):
HostCapability<EthereumPeer>(),
Worker ("ethsync"),
m_chain (_ch),
m_tq (_tq),
m_bq (_bq),
m_networkId (_networkId)
{
m_latestBlockSent = _ch.currentHash();
}
EthereumHost::~EthereumHost()
{
for (auto i: peerSessions())
i.first->cap<EthereumPeer>().get()->abortSync();
}
bool EthereumHost::ensureInitialised()
{
if (!m_latestBlockSent)
{
// First time - just initialise.
m_latestBlockSent = m_chain.currentHash();
clog(NetNote) << "Initialising: latest=" << m_latestBlockSent;
for (auto const& i: m_tq.transactions())
m_transactionsSent.insert(i.first);
return true;
}
return false;
}
void EthereumHost::noteNeedsSyncing(EthereumPeer* _who)
{
// if already downloading hash-chain, ignore.
if (isSyncing())
{
clog(NetAllDetail) << "Sync in progress: Just set to help out.";
if (m_syncer->m_asking == Asking::Blocks)
_who->transition(Asking::Blocks);
}
else
// otherwise check to see if we should be downloading...
_who->attemptSync();
}
void EthereumHost::changeSyncer(EthereumPeer* _syncer)
{
if (_syncer)
clog(NetAllDetail) << "Changing syncer to" << _syncer->session()->socketId();
else
clog(NetAllDetail) << "Clearing syncer.";
m_syncer = _syncer;
if (isSyncing())
{
if (_syncer->m_asking == Asking::Blocks)
for (auto j: peerSessions())
{
auto e = j.first->cap<EthereumPeer>().get();
if (e != _syncer && e->m_asking == Asking::Nothing)
e->transition(Asking::Blocks);
}
}
else
{
// start grabbing next hash chain if there is one.
for (auto j: peerSessions())
{
j.first->cap<EthereumPeer>()->attemptSync();
if (isSyncing())
return;
}
clog(NetNote) << "No more peers to sync with.";
}
}
void EthereumHost::noteDoneBlocks(EthereumPeer* _who, bool _clemency)
{
if (m_man.isComplete())
{
// Done our chain-get.
clog(NetNote) << "Chain download complete.";
// 1/100th for each useful block hash.
_who->addRating(m_man.chainSize() / 100);
m_man.reset();
}
else if (_who->isSyncing())
{
if (_clemency)
clog(NetNote) << "Chain download failed. Aborted while incomplete.";
else
{
// Done our chain-get.
clog(NetWarn) << "Chain download failed. Peer with blocks didn't have them all. This peer is bad and should be punished.";
clog(NetWarn) << m_man.remaining();
clog(NetWarn) << "WOULD BAN.";
// m_banned.insert(_who->session()->id()); // We know who you are!
// _who->disable("Peer sent hashes but was unable to provide the blocks.");
}
m_man.reset();
}
}
void EthereumHost::reset()
{
if (m_syncer)
m_syncer->abortSync();
m_man.resetToChain(h256s());
m_latestBlockSent = h256();
m_transactionsSent.clear();
}
void EthereumHost::doWork()
{
bool netChange = ensureInitialised();
auto h = m_chain.currentHash();
// If we've finished our initial sync (including getting all the blocks into the chain so as to reduce invalid transactions), start trading transactions & blocks
if (!isSyncing() && m_chain.isKnown(m_latestBlockSent))
{
if (m_newTransactions)
{
m_newTransactions = false;
maintainTransactions();
}
if (m_newBlocks)
{
m_newBlocks = false;
maintainBlocks(h);
}
}
for (auto p: peerSessions())
if (shared_ptr<EthereumPeer> const& ep = p.first->cap<EthereumPeer>())
ep->tick();
// return netChange;
// TODO: Figure out what to do with netChange.
(void)netChange;
}
void EthereumHost::maintainTransactions()
{
// Send any new transactions.
unordered_map<std::shared_ptr<EthereumPeer>, h256s> peerTransactions;
auto ts = m_tq.transactions();
for (auto const& i: ts)
{
bool unsent = !m_transactionsSent.count(i.first);
for (auto const& p: randomSelection(0, [&](EthereumPeer* p) { return p->m_requireTransactions || (unsent && !p->m_knownTransactions.count(i.first)); }).second)
peerTransactions[p].push_back(i.first);
}
for (auto const& t: ts)
m_transactionsSent.insert(t.first);
for (auto p: peerSessions())
if (auto ep = p.first->cap<EthereumPeer>())
{
bytes b;
unsigned n = 0;
for (auto const& h: peerTransactions[ep])
{
ep->m_knownTransactions.insert(h);
b += ts[h].rlp();
++n;
}
ep->clearKnownTransactions();
if (n || ep->m_requireTransactions)
{
RLPStream ts;
ep->prep(ts, TransactionsPacket, n).appendRaw(b, n);
ep->sealAndSend(ts);
}
ep->m_requireTransactions = false;
}
}
pair<vector<shared_ptr<EthereumPeer>>, vector<shared_ptr<EthereumPeer>>> EthereumHost::randomSelection(unsigned _percent, std::function<bool(EthereumPeer*)> const& _allow)
{
pair<vector<shared_ptr<EthereumPeer>>, vector<shared_ptr<EthereumPeer>>> ret;
ret.second.reserve(peerSessions().size());
for (auto const& j: peerSessions())
{
auto pp = j.first->cap<EthereumPeer>();
if (_allow(pp.get()))
ret.second.push_back(pp);
}
ret.second.reserve((peerSessions().size() * _percent + 99) / 100);
for (unsigned i = (peerSessions().size() * _percent + 99) / 100; i-- && ret.second.size();)
{
unsigned n = rand() % ret.second.size();
ret.first.push_back(std::move(ret.second[n]));
ret.second.erase(ret.second.begin() + n);
}
return ret;
}
void EthereumHost::maintainBlocks(h256 const& _currentHash)
{
// Send any new blocks.
auto detailsFrom = m_chain.details(m_latestBlockSent);
auto detailsTo = m_chain.details(_currentHash);
if (detailsFrom.totalDifficulty < detailsTo.totalDifficulty)
{
if (diff(detailsFrom.number, detailsTo.number) < 20)
{
// don't be sending more than 20 "new" blocks. if there are any more we were probably waaaay behind.
clog(NetMessageSummary) << "Sending a new block (current is" << _currentHash << ", was" << m_latestBlockSent << ")";
h256s blocks = get<0>(m_chain.treeRoute(m_latestBlockSent, _currentHash, false, false, true));
auto s = randomSelection(25, [&](EthereumPeer* p){ DEV_GUARDED(p->x_knownBlocks) return !p->m_knownBlocks.count(_currentHash); return false; });
for (shared_ptr<EthereumPeer> const& p: s.first)
for (auto const& b: blocks)
{
RLPStream ts;
p->prep(ts, NewBlockPacket, 2).appendRaw(m_chain.block(b), 1).append(m_chain.details(b).totalDifficulty);
Guard l(p->x_knownBlocks);
p->sealAndSend(ts);
p->m_knownBlocks.clear();
}
for (shared_ptr<EthereumPeer> const& p: s.second)
{
RLPStream ts;
p->prep(ts, NewBlockHashesPacket, blocks.size());
for (auto const& b: blocks)
ts.append(b);
Guard l(p->x_knownBlocks);
p->sealAndSend(ts);
p->m_knownBlocks.clear();
}
}
m_latestBlockSent = _currentHash;
}
}