You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
659 lines
18 KiB
659 lines
18 KiB
/*
|
|
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 <libethcore/Params.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;
|
|
|
|
unsigned const EthereumHost::c_oldProtocolVersion = 60; //TODO: remove this once v61+ is common
|
|
|
|
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();
|
|
m_hashMan.reset(m_chain.number() + 1);
|
|
}
|
|
|
|
EthereumHost::~EthereumHost()
|
|
{
|
|
forEachPeer([](EthereumPeer* _p) { _p->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::reset()
|
|
{
|
|
forEachPeer([](EthereumPeer* _p) { _p->abortSync(); });
|
|
m_man.resetToChain(h256s());
|
|
m_hashMan.reset(m_chain.number() + 1);
|
|
m_needSyncBlocks = true;
|
|
m_needSyncHashes = true;
|
|
m_syncingLatestHash = h256();
|
|
m_syncingTotalDifficulty = 0;
|
|
m_latestBlockSent = h256();
|
|
m_transactionsSent.clear();
|
|
m_hashes.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);
|
|
}
|
|
}
|
|
|
|
forEachPeer([](EthereumPeer* _p) { _p->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);
|
|
forEachPeerPtr([&](shared_ptr<EthereumPeer> _p)
|
|
{
|
|
bytes b;
|
|
unsigned n = 0;
|
|
for (auto const& h: peerTransactions[_p])
|
|
{
|
|
_p->m_knownTransactions.insert(h);
|
|
b += ts[h].rlp();
|
|
++n;
|
|
}
|
|
|
|
_p->clearKnownTransactions();
|
|
|
|
if (n || _p->m_requireTransactions)
|
|
{
|
|
RLPStream ts;
|
|
_p->prep(ts, TransactionsPacket, n).appendRaw(b, n);
|
|
_p->sealAndSend(ts);
|
|
}
|
|
_p->m_requireTransactions = false;
|
|
});
|
|
}
|
|
|
|
void EthereumHost::forEachPeer(std::function<void(EthereumPeer*)> const& _f) const
|
|
{
|
|
forEachPeerPtr([&](std::shared_ptr<EthereumPeer> _p)
|
|
{
|
|
if (_p)
|
|
_f(_p.get());
|
|
});
|
|
}
|
|
|
|
void EthereumHost::forEachPeerPtr(std::function<void(std::shared_ptr<EthereumPeer>)> const& _f) const
|
|
{
|
|
for (auto s: peerSessions())
|
|
_f(s.first->cap<EthereumPeer>());
|
|
for (auto s: peerSessions(c_oldProtocolVersion)) //TODO: remove once v61+ is common
|
|
_f(s.first->cap<EthereumPeer>(c_oldProtocolVersion));
|
|
}
|
|
|
|
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;
|
|
forEachPeerPtr([&](shared_ptr<EthereumPeer> _p)
|
|
{
|
|
if (_p && _allow(_p.get()))
|
|
ret.second.push_back(_p);
|
|
});
|
|
|
|
size_t size = (ret.second.size() * _percent + 99) / 100;
|
|
ret.second.reserve(size);
|
|
for (unsigned i = size; 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;
|
|
}
|
|
}
|
|
|
|
void EthereumHost::onPeerStatus(EthereumPeer* _peer)
|
|
{
|
|
Guard l(x_sync);
|
|
if (_peer->m_genesisHash != m_chain.genesisHash())
|
|
_peer->disable("Invalid genesis hash");
|
|
else if (_peer->m_protocolVersion != protocolVersion() && _peer->m_protocolVersion != c_oldProtocolVersion)
|
|
_peer->disable("Invalid protocol version.");
|
|
else if (_peer->m_networkId != networkId())
|
|
_peer->disable("Invalid network identifier.");
|
|
else if (_peer->session()->info().clientVersion.find("/v0.7.0/") != string::npos)
|
|
_peer->disable("Blacklisted client version.");
|
|
else if (isBanned(_peer->session()->id()))
|
|
_peer->disable("Peer banned for previous bad behaviour.");
|
|
else
|
|
{
|
|
_peer->m_protocolVersion = EthereumHost::c_oldProtocolVersion; //force V60 for now
|
|
if (_peer->m_protocolVersion != protocolVersion())
|
|
estimatePeerHashes(_peer);
|
|
else if (_peer->m_latestBlockNumber > m_chain.number())
|
|
_peer->m_expectedHashes = (unsigned)_peer->m_latestBlockNumber - m_chain.number();
|
|
if (m_hashMan.chainSize() < _peer->m_expectedHashes)
|
|
m_hashMan.resetToRange(m_chain.number() + 1, _peer->m_expectedHashes);
|
|
continueSync(_peer);
|
|
}
|
|
}
|
|
|
|
void EthereumHost::estimatePeerHashes(EthereumPeer* _peer)
|
|
{
|
|
BlockInfo block = m_chain.info();
|
|
time_t lastBlockTime = (block.hash() == m_chain.genesisHash()) ? 1428192000 : (time_t)block.timestamp;
|
|
time_t now = time(0);
|
|
unsigned blockCount = 1000;
|
|
if (lastBlockTime > now)
|
|
clog(NetWarn) << "Clock skew? Latest block is in the future";
|
|
else
|
|
blockCount += (now - lastBlockTime) / (unsigned)c_durationLimit;
|
|
clog(NetAllDetail) << "Estimated hashes: " << blockCount;
|
|
_peer->m_expectedHashes = blockCount;
|
|
}
|
|
|
|
void EthereumHost::onPeerHashes(EthereumPeer* _peer, h256s const& _hashes)
|
|
{
|
|
Guard l(x_sync);
|
|
assert(_peer->m_asking == Asking::Nothing);
|
|
onPeerHashes(_peer, _hashes, false);
|
|
}
|
|
|
|
void EthereumHost::onPeerHashes(EthereumPeer* _peer, h256s const& _hashes, bool _complete)
|
|
{
|
|
if (_hashes.empty())
|
|
{
|
|
onPeerDoneHashes(_peer, true);
|
|
return;
|
|
}
|
|
unsigned knowns = 0;
|
|
unsigned unknowns = 0;
|
|
h256s neededBlocks;
|
|
for (unsigned i = 0; i < _hashes.size(); ++i)
|
|
{
|
|
_peer->addRating(1);
|
|
auto h = _hashes[i];
|
|
auto status = m_bq.blockStatus(h);
|
|
if (status == QueueStatus::Importing || status == QueueStatus::Ready || m_chain.isKnown(h))
|
|
{
|
|
clog(NetMessageSummary) << "block hash ready:" << h << ". Start blocks download...";
|
|
m_hashes += neededBlocks;
|
|
onPeerDoneHashes(_peer, true);
|
|
return;
|
|
}
|
|
else if (status == QueueStatus::Bad)
|
|
{
|
|
cwarn << "block hash bad!" << h << ". Bailing...";
|
|
_peer->setIdle();
|
|
return;
|
|
}
|
|
else if (status == QueueStatus::Unknown)
|
|
{
|
|
unknowns++;
|
|
neededBlocks.push_back(h);
|
|
}
|
|
else
|
|
knowns++;
|
|
m_syncingLatestHash = h;
|
|
}
|
|
m_hashes += neededBlocks;
|
|
clog(NetMessageSummary) << knowns << "knowns," << unknowns << "unknowns; now at" << m_syncingLatestHash;
|
|
if (_complete)
|
|
{
|
|
m_needSyncBlocks = true;
|
|
continueSync(_peer);
|
|
}
|
|
else if (m_hashes.size() > _peer->m_expectedHashes)
|
|
{
|
|
_peer->disable("Too many hashes");
|
|
m_hashes.clear();
|
|
m_syncingLatestHash = h256();
|
|
continueSync(); ///Try with some other peer, keep the chain
|
|
}
|
|
else
|
|
continueSync(_peer); /// Grab next hashes
|
|
}
|
|
|
|
void EthereumHost::onPeerHashes(EthereumPeer* _peer, unsigned /*_index*/, h256s const& _hashes)
|
|
{
|
|
Guard l(x_sync);
|
|
assert(_peer->m_asking == Asking::Nothing);
|
|
if (_hashes.empty())
|
|
{
|
|
onPeerDoneHashes(_peer, true);
|
|
return;
|
|
}
|
|
unsigned knowns = 0;
|
|
unsigned unknowns = 0;
|
|
h256s neededBlocks;
|
|
for (unsigned i = 0; i < _hashes.size(); ++i)
|
|
{
|
|
_peer->addRating(1);
|
|
auto h = _hashes[i];
|
|
auto status = m_bq.blockStatus(h);
|
|
if (status == QueueStatus::Importing || status == QueueStatus::Ready || m_chain.isKnown(h))
|
|
{
|
|
clog(NetWarn) << "block hash already known:" << h;
|
|
}
|
|
else if (status == QueueStatus::Bad)
|
|
{
|
|
clog(NetWarn) << "block hash bad!" << h << ". Bailing...";
|
|
_peer->setIdle();
|
|
return;
|
|
}
|
|
else if (status == QueueStatus::Unknown)
|
|
{
|
|
unknowns++;
|
|
neededBlocks.push_back(h);
|
|
}
|
|
else
|
|
knowns++;
|
|
}
|
|
m_man.appendToChain(neededBlocks);
|
|
clog(NetMessageSummary) << knowns << "knowns," << unknowns << "unknowns";
|
|
|
|
if (m_hashMan.isComplete())
|
|
{
|
|
// Done our chain-get.
|
|
m_needSyncHashes = false;
|
|
clog(NetNote) << "Hashes download complete.";
|
|
// 1/100th for each useful block hash.
|
|
_peer->addRating(m_man.chainSize() / 100); //TODO: what about other peers?
|
|
m_hashMan.reset(m_chain.number() + 1);
|
|
continueSync();
|
|
}
|
|
else
|
|
continueSync(_peer);
|
|
}
|
|
|
|
void EthereumHost::onPeerDoneHashes(EthereumPeer* _peer, bool _localChain)
|
|
{
|
|
assert(_peer->m_asking == Asking::Nothing);
|
|
m_needSyncHashes = false;
|
|
if (_peer->m_protocolVersion != protocolVersion() || _localChain)
|
|
{
|
|
m_man.resetToChain(m_hashes);
|
|
m_hashes.clear();
|
|
}
|
|
continueSync();
|
|
}
|
|
|
|
void EthereumHost::onPeerBlocks(EthereumPeer* _peer, RLP const& _r)
|
|
{
|
|
Guard l(x_sync);
|
|
assert(_peer->m_asking == Asking::Nothing);
|
|
unsigned itemCount = _r.itemCount();
|
|
clog(NetMessageSummary) << "Blocks (" << dec << itemCount << "entries)" << (itemCount ? "" : ": NoMoreBlocks");
|
|
|
|
if (itemCount == 0)
|
|
{
|
|
// Got to this peer's latest block - just give up.
|
|
clog(NetNote) << "Finishing blocks fetch...";
|
|
// NOTE: need to notify of giving up on chain-hashes, too, altering state as necessary.
|
|
_peer->setIdle();
|
|
return;
|
|
}
|
|
|
|
unsigned success = 0;
|
|
unsigned future = 0;
|
|
unsigned unknown = 0;
|
|
unsigned got = 0;
|
|
unsigned repeated = 0;
|
|
|
|
for (unsigned i = 0; i < itemCount; ++i)
|
|
{
|
|
auto h = BlockInfo::headerHash(_r[i].data());
|
|
if (_peer->m_sub.noteBlock(h))
|
|
{
|
|
_peer->addRating(10);
|
|
switch (m_bq.import(_r[i].data(), m_chain))
|
|
{
|
|
case ImportResult::Success:
|
|
success++;
|
|
break;
|
|
|
|
case ImportResult::Malformed:
|
|
case ImportResult::BadChain:
|
|
_peer->disable("Malformed block received.");
|
|
return;
|
|
|
|
case ImportResult::FutureTime:
|
|
future++;
|
|
break;
|
|
|
|
case ImportResult::AlreadyInChain:
|
|
case ImportResult::AlreadyKnown:
|
|
got++;
|
|
break;
|
|
|
|
case ImportResult::UnknownParent:
|
|
unknown++;
|
|
break;
|
|
|
|
default:;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
_peer->addRating(0); // -1?
|
|
repeated++;
|
|
}
|
|
}
|
|
|
|
clog(NetMessageSummary) << dec << success << "imported OK," << unknown << "with unknown parents," << future << "with future timestamps," << got << " already known," << repeated << " repeats received.";
|
|
|
|
if (m_man.isComplete() && !m_needSyncHashes)
|
|
{
|
|
// Done our chain-get.
|
|
m_needSyncBlocks = false;
|
|
clog(NetNote) << "Chain download complete.";
|
|
// 1/100th for each useful block hash.
|
|
_peer->addRating(m_man.chainSize() / 100); //TODO: what about other peers?
|
|
m_man.reset();
|
|
}
|
|
continueSync(_peer);
|
|
}
|
|
|
|
void EthereumHost::onPeerNewHashes(EthereumPeer* _peer, h256s const& _hashes)
|
|
{
|
|
Guard l(x_sync);
|
|
if (_peer->m_asking != Asking::Nothing)
|
|
{
|
|
clog(NetMessageSummary) << "Ignoring new hashes since we're already downloading.";
|
|
return;
|
|
}
|
|
clog(NetNote) << "New block hash discovered: syncing without help.";
|
|
onPeerHashes(_peer, _hashes, true);
|
|
}
|
|
|
|
void EthereumHost::onPeerNewBlock(EthereumPeer* _peer, RLP const& _r)
|
|
{
|
|
Guard l(x_sync);
|
|
if (_peer->m_asking != Asking::Nothing)
|
|
{
|
|
clog(NetMessageSummary) << "Ignoring new blocks since we're already downloading.";
|
|
return;
|
|
}
|
|
auto h = BlockInfo::headerHash(_r[0].data());
|
|
clog(NetMessageSummary) << "NewBlock: " << h;
|
|
|
|
if (_r.itemCount() != 2)
|
|
_peer->disable("NewBlock without 2 data fields.");
|
|
else
|
|
{
|
|
bool sync = false;
|
|
switch (m_bq.import(_r[0].data(), m_chain))
|
|
{
|
|
case ImportResult::Success:
|
|
_peer->addRating(100);
|
|
break;
|
|
case ImportResult::FutureTime:
|
|
//TODO: Rating dependent on how far in future it is.
|
|
break;
|
|
|
|
case ImportResult::Malformed:
|
|
case ImportResult::BadChain:
|
|
_peer->disable("Malformed block received.");
|
|
return;
|
|
|
|
case ImportResult::AlreadyInChain:
|
|
case ImportResult::AlreadyKnown:
|
|
break;
|
|
|
|
case ImportResult::UnknownParent:
|
|
if (h)
|
|
{
|
|
u256 difficulty = _r[1].toInt<u256>();
|
|
if (m_syncingTotalDifficulty < difficulty)
|
|
{
|
|
clog(NetMessageSummary) << "Received block with no known parent. Resyncing...";
|
|
_peer->m_latestHash = h;
|
|
_peer->m_totalDifficulty = difficulty;
|
|
m_needSyncHashes = true;
|
|
m_needSyncBlocks = true;
|
|
m_syncingLatestHash = _peer->m_latestHash;
|
|
sync = true;
|
|
}
|
|
}
|
|
break;
|
|
default:;
|
|
}
|
|
|
|
DEV_GUARDED(_peer->x_knownBlocks)
|
|
_peer->m_knownBlocks.insert(h);
|
|
|
|
if (sync)
|
|
continueSync(_peer);
|
|
}
|
|
}
|
|
|
|
void EthereumHost::onPeerTransactions(EthereumPeer* _peer, RLP const& _r)
|
|
{
|
|
unsigned itemCount = _r.itemCount();
|
|
clog(NetAllDetail) << "Transactions (" << dec << itemCount << "entries)";
|
|
Guard l(_peer->x_knownTransactions);
|
|
for (unsigned i = 0; i < itemCount; ++i)
|
|
{
|
|
auto h = sha3(_r[i].data());
|
|
_peer->m_knownTransactions.insert(h);
|
|
ImportResult ir = m_tq.import(_r[i].data());
|
|
switch (ir)
|
|
{
|
|
case ImportResult::Malformed:
|
|
_peer->addRating(-100);
|
|
break;
|
|
case ImportResult::AlreadyKnown:
|
|
// if we already had the transaction, then don't bother sending it on.
|
|
m_transactionsSent.insert(h);
|
|
_peer->addRating(0);
|
|
break;
|
|
case ImportResult::Success:
|
|
_peer->addRating(100);
|
|
break;
|
|
default:;
|
|
}
|
|
}
|
|
}
|
|
|
|
void EthereumHost::continueSync()
|
|
{
|
|
clog(NetAllDetail) << "Getting help with downloading hashes and blocks";
|
|
forEachPeer([&](EthereumPeer* _p)
|
|
{
|
|
if (_p->m_asking == Asking::Nothing)
|
|
continueSync(_p);
|
|
});
|
|
}
|
|
|
|
void EthereumHost::continueSync(EthereumPeer* _peer)
|
|
{
|
|
assert(_peer->m_asking == Asking::Nothing);
|
|
bool otherPeerSync = false;
|
|
if (m_needSyncHashes && peerShouldGrabChain(_peer))
|
|
{
|
|
forEachPeer([&](EthereumPeer* _p)
|
|
{
|
|
if (_p != _peer && _p->m_asking == Asking::Hashes && _p->m_protocolVersion != protocolVersion())
|
|
otherPeerSync = true; // Already have a peer downloading hash chain with old protocol, do nothing
|
|
});
|
|
if (otherPeerSync)
|
|
{
|
|
/// Downloading from other peer with v60 protocol, nothing ese we can do
|
|
_peer->setIdle();
|
|
return;
|
|
}
|
|
if (_peer->m_protocolVersion == protocolVersion() && !m_syncingLatestHash)
|
|
_peer->requestHashes(); /// v61+ and not catching up to a particular hash
|
|
else
|
|
{
|
|
// Restart/continue sync in single peer mode
|
|
if (!m_syncingLatestHash)
|
|
{
|
|
m_syncingLatestHash =_peer->m_latestHash;
|
|
m_syncingTotalDifficulty = _peer->m_totalDifficulty;
|
|
}
|
|
_peer->requestHashes(m_syncingLatestHash);
|
|
}
|
|
}
|
|
else if (m_needSyncBlocks && peerShouldGrabBlocks(_peer)) // Check if this peer can help with downloading blocks
|
|
_peer->requestBlocks();
|
|
else
|
|
_peer->setIdle();
|
|
}
|
|
|
|
bool EthereumHost::peerShouldGrabBlocks(EthereumPeer* _peer) const
|
|
{
|
|
auto td = _peer->m_totalDifficulty;
|
|
auto lh = m_syncingLatestHash;
|
|
auto ctd = m_chain.details().totalDifficulty;
|
|
|
|
clog(NetAllDetail) << "Should grab blocks? " << td << "vs" << ctd;
|
|
if (td < ctd || (td == ctd && m_chain.currentHash() == lh))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
bool EthereumHost::peerShouldGrabChain(EthereumPeer* _peer) const
|
|
{
|
|
h256 c = m_chain.currentHash();
|
|
unsigned n = m_chain.number();
|
|
u256 td = m_chain.details().totalDifficulty;
|
|
|
|
clog(NetAllDetail) << "Attempt chain-grab? Latest:" << c << ", number:" << n << ", TD:" << td << " versus " << _peer->m_totalDifficulty;
|
|
if (td >= _peer->m_totalDifficulty)
|
|
{
|
|
clog(NetAllDetail) << "No. Our chain is better.";
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
clog(NetAllDetail) << "Yes. Their chain is better.";
|
|
return true;
|
|
}
|
|
}
|
|
|
|
bool EthereumHost::isSyncing() const
|
|
{
|
|
Guard l(x_sync);
|
|
bool syncing = false;
|
|
forEachPeer([&](EthereumPeer* _p)
|
|
{
|
|
if (_p->m_asking != Asking::Nothing)
|
|
syncing = true;
|
|
});
|
|
return syncing;
|
|
}
|
|
|