GetBlockHashesByNumber packet

libethereum/Client.cpp

@@ -185,10 +185,9 @@ Client::Client(p2p::Host* _extNet, std::shared_ptr<GasPricer> _gp, std::string c
 
 	m_gp->update(m_bc);
 
-
 	auto host = _extNet->registerCapability(new EthereumHost(m_bc, m_tq, m_bq, _networkId));
 	m_host = host;
-	_extNet->addCapability(host, EthereumHost::staticName(), EthereumHost::staticVersion() - 1);
+	_extNet->addCapability(host, EthereumHost::staticName(), EthereumHost::c_oldProtocolVersion); //TODO: remove this one v61+ protocol is common
 
 	if (_dbPath.size())
 		Defaults::setDBPath(_dbPath);

libethereum/CommonNet.h

@@ -63,6 +63,7 @@ enum
 	GetBlocksPacket,
 	BlocksPacket,
 	NewBlockPacket,
+	GetBlockHashesByNumberPacket,
 	PacketCount
 };
 

libethereum/DownloadMan.cpp

@@ -122,5 +122,6 @@ void HashDownloadSub::noteHash(unsigned _index, unsigned _size)
 	Guard l(m_fetch);
 	if (m_man)
 		for(unsigned i = _index; i < _index + _size; ++i)
+			if (i >= m_man->m_got.all().first && i < m_man->m_got.all().second)
 				m_man->m_got += i;
 }

libethereum/DownloadMan.h

@@ -234,12 +234,6 @@ public:
 		m_chainStart = _start;
 		m_chainCount = 0;
 		m_got = RangeMask<unsigned>(_start, _start);
-
-		{
-			ReadGuard l(x_subs);
-			for (auto i: m_subs)
-				i->resetFetch();
-		}
 	}
 
 	RangeMask<unsigned> taken(bool _desperate = false) const
@@ -259,7 +253,7 @@ public:
 	{
 		ReadGuard l(m_lock);
 		return m_got.full();
-	}\
+	}
 
 	size_t chainSize() const { ReadGuard l(m_lock); return m_chainCount; }
 	size_t chainEmpty() const { ReadGuard l(m_lock); return m_chainCount == 0; }
@@ -277,10 +271,6 @@ private:
 	std::unordered_set<HashDownloadSub*> m_subs;
 };
 
-
-
-
-
 }
 
 }

libethereum/EthereumHost.cpp

@@ -27,6 +27,7 @@
 #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"
@@ -37,7 +38,7 @@ using namespace dev;
 using namespace dev::eth;
 using namespace p2p;
 
-const unsigned c_prevProtocolVersion = 60;
+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>(),
@@ -71,12 +72,6 @@ bool EthereumHost::ensureInitialised()
 	return false;
 }
 
-void EthereumHost::noteNeedsSyncing(EthereumPeer* _who)
-{
-	if (_who->m_asking == Asking::Nothing)
-		continueSync(_who);
-}
-
 void EthereumHost::reset()
 {
 	forEachPeer([](EthereumPeer* _p) { _p->abortSync(); });
@@ -88,7 +83,7 @@ void EthereumHost::reset()
 	m_syncingTotalDifficulty = 0;
 	m_latestBlockSent = h256();
 	m_transactionsSent.clear();
-	m_v60Hashes.clear();
+	m_hashes.clear();
 }
 
 void EthereumHost::doWork()
@@ -130,7 +125,7 @@ void EthereumHost::maintainTransactions()
 	}
 	for (auto const& t: ts)
 		m_transactionsSent.insert(t.first);
-	forEachPeer([&](shared_ptr<EthereumPeer> _p)
+	forEachPeerPtr([&](shared_ptr<EthereumPeer> _p)
 	{
 		bytes b;
 		unsigned n = 0;
@@ -153,29 +148,27 @@ void EthereumHost::maintainTransactions()
 	});
 }
 
-void EthereumHost::forEachPeer(std::function<void(EthereumPeer*)> const& _f)
+void EthereumHost::forEachPeer(std::function<void(EthereumPeer*)> const& _f) const
 {
-	forEachPeer([&](std::shared_ptr<EthereumPeer> _p)
+	forEachPeerPtr([&](std::shared_ptr<EthereumPeer> _p)
 	{
 		if (_p)
 			_f(_p.get());
 	});
 }
 
-void EthereumHost::forEachPeer(std::function<void(std::shared_ptr<EthereumPeer>)> const& _f)
+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(protocolVersion() - 1)) //TODO:
-		_f(s.first->cap<EthereumPeer>(protocolVersion() - 1));
-
+	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;
-	vector<shared_ptr<EthereumPeer>> peers;
-	forEachPeer([&](shared_ptr<EthereumPeer> _p)
+	forEachPeerPtr([&](shared_ptr<EthereumPeer> _p)
 	{
 		if (_p && _allow(_p.get()))
 			ret.second.push_back(_p);
@@ -233,16 +226,12 @@ void EthereumHost::maintainBlocks(h256 const& _currentHash)
 	}
 }
 
-void EthereumHost::onPeerState(EthereumPeer* _peer)
-{
-	if (!_peer->enabled())
+void EthereumHost::onPeerStatus(EthereumPeer* _peer)
 {
-		clog(NetNote) << "Ignoring status from disabled peer";
-		return;
-	}
+	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_prevProtocolVersion)
+	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.");
@@ -252,16 +241,44 @@ void EthereumHost::onPeerState(EthereumPeer* _peer)
 		_peer->disable("Peer banned for previous bad behaviour.");
 	else
 	{
-
-		_peer->m_expectedHashes = 500000; //TODO:
+		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;
@@ -273,8 +290,8 @@ void EthereumHost::onPeerHashes(EthereumPeer* _peer, h256s const& _hashes)
 		if (status == QueueStatus::Importing || status == QueueStatus::Ready || m_chain.isKnown(h))
 		{
 			clog(NetMessageSummary) << "block hash ready:" << h << ". Start blocks download...";
-			m_v60Hashes += neededBlocks;
-			onPeerDoneHashes(_peer, false);
+			m_hashes += neededBlocks;
+			onPeerDoneHashes(_peer, true);
 			return;
 		}
 		else if (status == QueueStatus::Bad)
@@ -292,7 +309,7 @@ void EthereumHost::onPeerHashes(EthereumPeer* _peer, h256s const& _hashes)
 			knowns++;
 		m_syncingLatestHash = h;
 	}
-	m_v60Hashes += neededBlocks;
+	m_hashes += neededBlocks;
 	clog(NetMessageSummary) << knowns << "knowns," << unknowns << "unknowns; now at" << m_syncingLatestHash;
 	if (_complete)
 	{
@@ -312,6 +329,13 @@ void EthereumHost::onPeerHashes(EthereumPeer* _peer, h256s const& _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;
@@ -322,11 +346,11 @@ void EthereumHost::onPeerHashes(EthereumPeer* _peer, unsigned /*_index*/, h256s
 		auto status = m_bq.blockStatus(h);
 		if (status == QueueStatus::Importing || status == QueueStatus::Ready || m_chain.isKnown(h))
 		{
-			clog(NetWarn) << "block hash alrady known:" << h;
+			clog(NetWarn) << "block hash already known:" << h;
 		}
 		else if (status == QueueStatus::Bad)
 		{
-			cwarn << "block hash bad!" << h << ". Bailing...";
+			clog(NetWarn) << "block hash bad!" << h << ". Bailing...";
 			_peer->setIdle();
 			return;
 		}
@@ -337,10 +361,9 @@ void EthereumHost::onPeerHashes(EthereumPeer* _peer, unsigned /*_index*/, h256s
 		}
 		else
 			knowns++;
-		m_syncingLatestHash = h;
 	}
 	m_man.appendToChain(neededBlocks);
-	clog(NetMessageSummary) << knowns << "knowns," << unknowns << "unknowns; now at" << m_syncingLatestHash;
+	clog(NetMessageSummary) << knowns << "knowns," << unknowns << "unknowns";
 
 	if (m_hashMan.isComplete())
 	{
@@ -356,33 +379,30 @@ void EthereumHost::onPeerHashes(EthereumPeer* _peer, unsigned /*_index*/, h256s
 		continueSync(_peer);
 }
 
-void EthereumHost::onPeerDoneHashes(EthereumPeer* _peer, bool _new)
+void EthereumHost::onPeerDoneHashes(EthereumPeer* _peer, bool _localChain)
 {
+	assert(_peer->m_asking == Asking::Nothing);
 	m_needSyncHashes = false;
-	if (_peer->m_protocolVersion == protocolVersion() || _new)
+	if (_peer->m_protocolVersion != protocolVersion() || _localChain)
 	{
-		continueSync(_peer);
+		m_man.resetToChain(m_hashes);
+		m_hashes.clear();
 	}
-	else
-	{
-		m_man.resetToChain(m_v60Hashes);
 	continueSync();
 }
-}
 
 void EthereumHost::onPeerBlocks(EthereumPeer* _peer, RLP const& _r)
 {
-	if (!_peer->enabled())
-	{
-		clog(NetNote) << "Ignoring blocks from disabled peer";
-		return;
-	}
+	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;
 	}
@@ -550,9 +570,9 @@ void EthereumHost::onPeerTransactions(EthereumPeer* _peer, RLP const& _r)
 
 void EthereumHost::continueSync()
 {
+	clog(NetAllDetail) << "Getting help with downloading hashes and blocks";
 	forEachPeer([&](EthereumPeer* _p)
 	{
-		clog(NetNote) << "Getting help with downloading hashes and blocks";
 		if (_p->m_asking == Asking::Nothing)
 			continueSync(_p);
 	});
@@ -560,29 +580,23 @@ void EthereumHost::continueSync()
 
 void EthereumHost::continueSync(EthereumPeer* _peer)
 {
+	assert(_peer->m_asking == Asking::Nothing);
 	bool otherPeerSync = false;
-	bool thisPeerSync = false;
 	if (m_needSyncHashes && peerShouldGrabChain(_peer))
 	{
 		forEachPeer([&](EthereumPeer* _p)
 		{
-			if (_p->m_asking == Asking::Hashes && _p->m_protocolVersion != protocolVersion())
-			{
-				// Already have a peer downloading hash chain with old protocol, do nothing
-				if (_p == _peer)
-					thisPeerSync = true;
-				else
-					otherPeerSync = true;
-
-			}
+			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())
-			_peer->requestHashes();
+		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
@@ -606,11 +620,9 @@ bool EthereumHost::peerShouldGrabBlocks(EthereumPeer* _peer) const
 	auto lh = m_syncingLatestHash;
 	auto ctd = m_chain.details().totalDifficulty;
 
-	clog(NetNote) << "Should grab blocks? " << td << "vs" << ctd;
-
+	clog(NetAllDetail) << "Should grab blocks? " << td << "vs" << ctd;
 	if (td < ctd || (td == ctd && m_chain.currentHash() == lh))
 		return false;
-
 	return true;
 }
 
@@ -632,3 +644,15 @@ bool EthereumHost::peerShouldGrabChain(EthereumPeer* _peer) const
 		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;
+}

libethereum/EthereumHost.h

@@ -56,7 +56,6 @@ class BlockQueue;
  */
 class EthereumHost: public p2p::HostCapability<EthereumPeer>, Worker
 {
-	friend class EthereumPeer;
 public:
 	/// Start server, but don't listen.
 	EthereumHost(BlockChain const& _ch, TransactionQueue& _tq, BlockQueue& _bq, u256 _networkId);
@@ -71,22 +70,30 @@ public:
 	void reset();
 
 	DownloadMan const& downloadMan() const { return m_man; }
-	bool isSyncing() const { return m_needSyncBlocks || m_needSyncHashes; }
+	bool isSyncing() const;
 
 	bool isBanned(p2p::NodeId _id) const { return !!m_banned.count(_id); }
 
 	void noteNewTransactions() { m_newTransactions = true; }
 	void noteNewBlocks() { m_newBlocks = true; }
 
-	void onPeerState(EthereumPeer* _peer);
+	void onPeerStatus(EthereumPeer* _peer); ///< Called by peer to report status
+	void onPeerBlocks(EthereumPeer* _peer, RLP const& _r); ///< Called by peer once it has new blocks during syn
+	void onPeerNewBlock(EthereumPeer* _peer, RLP const& _r); ///< Called by peer once it has new blocks
+	void onPeerNewHashes(EthereumPeer* _peer, h256s const& _hashes); ///< Called by peer once it has new hashes
+	void onPeerHashes(EthereumPeer* _peer, h256s const& _hashes); ///< Called by peer once it has another sequential block of hashes during sync
+	void onPeerHashes(EthereumPeer* _peer, unsigned _index, h256s const& _hashes); ///< Called by peer once it has a new ordered block of hashes starting with a particular number
+	void onPeerTransactions(EthereumPeer* _peer, RLP const& _r); ///< Called by peer when it has new transactions
 
+	DownloadMan& downloadMan() { return m_man; }
+	HashDownloadMan& hashDownloadMan() { return m_hashMan; }
+	BlockChain const& chain() { return m_chain; }
+
+	static unsigned const c_oldProtocolVersion;
 private:
 	std::pair<std::vector<std::shared_ptr<EthereumPeer>>, std::vector<std::shared_ptr<EthereumPeer>>> randomSelection(unsigned _percent = 25, std::function<bool(EthereumPeer*)> const& _allow = [](EthereumPeer const*){ return true; });
-	void forEachPeer(std::function<void(std::shared_ptr<EthereumPeer>)> const& _f);
-	void forEachPeer(std::function<void(EthereumPeer*)> const& _f);
-
-	/// Session is tell us that we may need (re-)syncing with the peer.
-	void noteNeedsSyncing(EthereumPeer* _who);
+	void forEachPeerPtr(std::function<void(std::shared_ptr<EthereumPeer>)> const& _f) const;
+	void forEachPeer(std::function<void(EthereumPeer*)> const& _f) const;
 
 	/// Sync with the BlockChain. It might contain one of our mined blocks, we might have new candidates from the network.
 	void doWork();
@@ -108,15 +115,13 @@ private:
 	virtual void onStarting() { startWorking(); }
 	virtual void onStopping() { stopWorking(); }
 
-	void changeSyncer(EthereumPeer* _ignore, bool _needHelp = true);
-	void continueSync();
-	void continueSync(EthereumPeer* _peer);
-	void onPeerBlocks(EthereumPeer* _peer, RLP const& _r);
-	void onPeerDoneHashes(EthereumPeer* _peer, bool _new);
-	void onPeerHashes(EthereumPeer* _peer, h256s const& _hashes);
-	void onPeerHashes(EthereumPeer* _peer, unsigned _index, h256s const& _hashes);
+	void continueSync(); /// Find something to do for all peers
+	void continueSync(EthereumPeer* _peer); /// Find some work to do for a peer
+	void onPeerDoneHashes(EthereumPeer* _peer, bool _new); /// Called when done downloading hashes from peer
+	void onPeerHashes(EthereumPeer* _peer, h256s const& _hashes, bool _complete);
 	bool peerShouldGrabBlocks(EthereumPeer* _peer) const;
 	bool peerShouldGrabChain(EthereumPeer* _peer) const;
+	void estimatePeerHashes(EthereumPeer* _peer);
 
 	BlockChain const& m_chain;
 	TransactionQueue& m_tq;					///< Maintains a list of incoming transactions not yet in a block on the blockchain.
@@ -124,8 +129,6 @@ private:
 
 	u256 m_networkId;
 
-	std::weak_ptr<EthereumPeer> m_hashSyncer;
-
 	DownloadMan m_man;
 	HashDownloadMan m_hashMan;
 
@@ -137,14 +140,12 @@ private:
 	bool m_newTransactions = false;
 	bool m_newBlocks = false;
 
-	unsigned m_maxKnownNumber = 0;
-	u256 m_maxKnownDifficulty;
-	bool m_needSyncHashes = true;
-	bool m_needSyncBlocks = true;
-	h256 m_syncingLatestHash;					///< Peer's latest block's hash, as of the current sync.
-	u256 m_syncingTotalDifficulty;				///< Peer's latest block's total difficulty, as of the current sync.
-	h256s m_v60Hashes;
-
+	mutable Mutex x_sync;
+	bool m_needSyncHashes = true;				///< Indicates if need to downlad hashes
+	bool m_needSyncBlocks = true;				///< Indicates if we still need to download some blocks
+	h256 m_syncingLatestHash;					///< Latest block's hash, as of the current sync.
+	u256 m_syncingTotalDifficulty;				///< Latest block's total difficulty, as of the current sync.
+	h256s m_hashes;								///< List of hashes with unknown block numbers. Used for v60 chain downloading and catching up to a particular unknown
 };
 
 }

libethereum/EthereumPeer.cpp

@@ -34,12 +34,14 @@ using namespace dev;
 using namespace dev::eth;
 using namespace p2p;
 
-EthereumPeer::EthereumPeer(Session* _s, HostCapabilityFace* _h, unsigned _i):
+EthereumPeer::EthereumPeer(Session* _s, HostCapabilityFace* _h, unsigned _i, CapDesc const& _cap):
 	Capability(_s, _h, _i),
-	m_sub(host()->m_man),
-	m_hashSub(host()->m_hashMan)
+	m_sub(host()->downloadMan()),
+	m_hashSub(host()->hashDownloadMan()),
+	m_peerCapabilityVersion(_cap.second)
 {
-	requestState();
+	m_syncHashNumber = host()->chain().number() + 1;
+	requestStatus();
 }
 
 EthereumPeer::~EthereumPeer()
@@ -78,55 +80,44 @@ string toString(Asking _a)
 
 void EthereumPeer::setIdle()
 {
-	if (m_asking == Asking::Blocks)
-	{
-		clog(NetNote) << "Finishing blocks fetch...";
-		// NOTE: need to notify of giving up on chain-hashes, too, altering state as necessary.
 	m_sub.doneFetch();
 	m_hashSub.doneFetch();
-
 	setAsking(Asking::Nothing);
 }
-	else if (m_asking == Asking::Hashes)
-	{
-		clog(NetNote) << "Finishing hashes fetch...";
 
-		setAsking(Asking::Nothing);
-	}
-	else if (m_asking == Asking::State)
-	{
-		setAsking(Asking::Nothing);
-	}
-}
-
-void EthereumPeer::requestState()
+void EthereumPeer::requestStatus()
 {
 	if (m_asking != Asking::Nothing)
 	clog(NetWarn) << "Bad state: requesting state should be the first action";
 	setAsking(Asking::State);
 	RLPStream s;
-	prep(s, StatusPacket, 5)
-					<< host()->protocolVersion() - 1
+	bool latest = m_peerCapabilityVersion == host()->protocolVersion();
+	prep(s, StatusPacket, latest ? 6 : 5)
+					<< (latest ? host()->protocolVersion() : EthereumHost::c_oldProtocolVersion)
 					<< host()->networkId()
-					<< host()->m_chain.details().totalDifficulty
-					<< host()->m_chain.currentHash()
-					<< host()->m_chain.genesisHash();
+					<< host()->chain().details().totalDifficulty
+					<< host()->chain().currentHash()
+					<< host()->chain().genesisHash();
+	if (latest)
+		s << u256(host()->chain().number());
 	sealAndSend(s);
 }
 
 void EthereumPeer::requestHashes()
 {
-	assert(m_asking != Asking::Blocks);
-	m_syncHashNumber = m_hashSub.nextFetch(c_maxBlocksAsk);
+	if (m_asking == Asking::Blocks)
+		return;
+	m_syncHashNumber = m_hashSub.nextFetch(c_maxHashesAsk);
 	setAsking(Asking::Hashes);
 	RLPStream s;
-	prep(s, GetBlockHashesPacket, 2) << m_syncHashNumber << c_maxHashesAsk;
+	prep(s, GetBlockHashesByNumberPacket, 2) << m_syncHashNumber << c_maxHashesAsk;
 	sealAndSend(s);
 }
 
 void EthereumPeer::requestHashes(h256 const& _lastHash)
 {
-	assert(m_asking != Asking::Blocks);
+	if (m_asking == Asking::Blocks)
+		return;
 	setAsking(Asking::Hashes);
 	RLPStream s;
 	prep(s, GetBlockHashesPacket, 2) << _lastHash << c_maxHashesAsk;
@@ -135,8 +126,7 @@ void EthereumPeer::requestHashes(h256 const& _lastHash)
 
 void EthereumPeer::requestBlocks()
 {
-	// Looks like it's the best yet for total difficulty. Set to download.
-	setAsking(Asking::Blocks);		// will kick off other peers to help if available.
+	setAsking(Asking::Blocks);
 	auto blocks = m_sub.nextFetch(c_maxBlocksAsk);
 	if (blocks.size())
 	{
@@ -154,31 +144,12 @@ void EthereumPeer::requestBlocks()
 void EthereumPeer::setAsking(Asking _a)
 {
 	m_asking = _a;
-
-	if (!isSyncing())
-	{
-		m_syncingLatestHash = h256();
-		m_syncingTotalDifficulty = 0;
-		m_syncingNeededBlocks.clear();
-	}
-
 	m_lastAsk = chrono::system_clock::now();
 
 	session()->addNote("ask", _a == Asking::Nothing ? "nothing" : _a == Asking::State ? "state" : _a == Asking::Hashes ? "hashes" : _a == Asking::Blocks ? "blocks" : "?");
 	session()->addNote("sync", string(isSyncing() ? "ongoing" : "holding") + (needsSyncing() ? " & needed" : ""));
 }
 
-void EthereumPeer::setNeedsSyncing(h256 _latestHash, u256 _td)
-{
-	m_latestHash = _latestHash;
-	m_totalDifficulty = _td;
-
-	if (m_latestHash)
-		host()->noteNeedsSyncing(this);
-
-	session()->addNote("sync", string(isSyncing() ? "ongoing" : "holding") + (needsSyncing() ? " & needed" : ""));
-}
-
 void EthereumPeer::tick()
 {
 	if (chrono::system_clock::now() - m_lastAsk > chrono::seconds(10) && m_asking != Asking::Nothing)
@@ -200,62 +171,55 @@ bool EthereumPeer::interpret(unsigned _id, RLP const& _r)
 	case StatusPacket:
 	{
 		m_protocolVersion = _r[0].toInt<unsigned>();
-		if (!!session()->cap<EthereumPeer>(EthereumHost::staticVersion()))
-			m_protocolVersion = host()->protocolVersion();
 		m_networkId = _r[1].toInt<u256>();
-
-		// a bit dirty as we're misusing these to communicate the values to transition, but harmless.
 		m_totalDifficulty = _r[2].toInt<u256>();
 		m_latestHash = _r[3].toHash<h256>();
 		m_genesisHash = _r[4].toHash<h256>();
-		clog(NetMessageSummary) << "Status:" << m_protocolVersion << "/" << m_networkId << "/" << m_genesisHash << ", TD:" << m_totalDifficulty << "=" << m_latestHash;
-		host()->onPeerState(this);
+		if (m_peerCapabilityVersion == host()->protocolVersion())
+		{
+			m_protocolVersion = host()->protocolVersion();
+			m_latestBlockNumber = _r[5].toInt<u256>();
+		}
+
+		clog(NetMessageSummary) << "Status:" << m_protocolVersion << "/" << m_networkId << "/" << m_genesisHash << "/" << m_latestBlockNumber << ", TD:" << m_totalDifficulty << "=" << m_latestHash;
+		setAsking(Asking::Nothing);
+		host()->onPeerStatus(this);
 		break;
 	}
 	case TransactionsPacket:
 	{
-		unsigned itemCount = _r.itemCount();
-		clog(NetAllDetail) << "Transactions (" << dec << itemCount << "entries)";
-		Guard l(x_knownTransactions);
-		for (unsigned i = 0; i < itemCount; ++i)
-		{
-			auto h = sha3(_r[i].data());
-			m_knownTransactions.insert(h);
-			ImportResult ir = host()->m_tq.import(_r[i].data());
-			switch (ir)
-			{
-			case ImportResult::Malformed:
-				addRating(-100);
-				break;
-			case ImportResult::AlreadyKnown:
-				// if we already had the transaction, then don't bother sending it on.
-				host()->m_transactionsSent.insert(h);
-				addRating(0);
-				break;
-			case ImportResult::Success:
-				addRating(100);
-				break;
-			default:;
-			}
-		}
+		host()->onPeerTransactions(this, _r);
 		break;
 	}
 	case GetBlockHashesPacket:
 	{
-		if (m_protocolVersion == host()->protocolVersion())
+		h256 later = _r[0].toHash<h256>();
+		unsigned limit = _r[1].toInt<unsigned>();
+		clog(NetMessageSummary) << "GetBlockHashes (" << limit << "entries," << later << ")";
+		unsigned c = min<unsigned>(host()->chain().number(later), limit);
+		RLPStream s;
+		prep(s, BlockHashesPacket, c);
+		h256 p = host()->chain().details(later).parent;
+		for (unsigned i = 0; i < c && p; ++i, p = host()->chain().details(p).parent)
+			s << p;
+		sealAndSend(s);
+		addRating(0);
+		break;
+	}
+	case GetBlockHashesByNumberPacket:
 	{
 		u256 number256 = _r[0].toInt<u256>();
 		unsigned number = (unsigned) number256;
 		unsigned limit = _r[1].toInt<unsigned>();
-			clog(NetMessageSummary) << "GetBlockHashes (" << number << "-" << number + limit << ")";
+		clog(NetMessageSummary) << "GetBlockHashesByNumber (" << number << "-" << number + limit << ")";
 		RLPStream s;
-			if (number <= host()->m_chain.number())
+		if (number <= host()->chain().number())
 		{
-				unsigned c = min<unsigned>(host()->m_chain.number() - number + 1, limit);
+			unsigned c = min<unsigned>(host()->chain().number() - number + 1, limit);
 			prep(s, BlockHashesPacket, c);
 			for (unsigned n = number; n < number + c; n++)
 			{
-					h256 p = host()->m_chain.numberHash(n);
+				h256 p = host()->chain().numberHash(n);
 				s << p;
 			}
 		}
@@ -263,24 +227,6 @@ bool EthereumPeer::interpret(unsigned _id, RLP const& _r)
 			prep(s, BlockHashesPacket, 0);
 		sealAndSend(s);
 		addRating(0);
-		}
-		else
-		{
-			// Support V60 protocol
-			h256 later = _r[0].toHash<h256>();
-			unsigned limit = _r[1].toInt<unsigned>();
-			clog(NetMessageSummary) << "GetBlockHashes (" << limit << "entries," << later << ")";
-
-			unsigned c = min<unsigned>(host()->m_chain.number(later), limit);
-
-			RLPStream s;
-			prep(s, BlockHashesPacket, c);
-			h256 p = host()->m_chain.details(later).parent;
-			for (unsigned i = 0; i < c && p; ++i, p = host()->m_chain.details(p).parent)
-				s << p;
-			sealAndSend(s);
-			addRating(0);
-		}
 		break;
 	}
 	case BlockHashesPacket:
@@ -290,14 +236,10 @@ bool EthereumPeer::interpret(unsigned _id, RLP const& _r)
 
 		if (m_asking != Asking::Hashes)
 		{
-			cwarn << "Peer giving us hashes when we didn't ask for them.";
+			clog(NetWarn) << "Peer giving us hashes when we didn't ask for them.";
 			break;
 		}
-		if (itemCount == 0)
-		{
-			host()->onPeerDoneHashes(this, false);
-			return true;
-		}
+		setAsking(Asking::Nothing);
 		h256s hashes(itemCount);
 		for (unsigned i = 0; i < itemCount; ++i)
 		{
@@ -306,10 +248,7 @@ bool EthereumPeer::interpret(unsigned _id, RLP const& _r)
 		}
 
 		if (m_protocolVersion == host()->protocolVersion())
-		{
-			//v61, report hashes ordered by number
-			host()->onPeerHashes(this,  m_syncHashNumber, hashes);
-		}
+			host()->onPeerHashes(this,  m_syncHashNumber, hashes); // V61+, report hashes by number
 		else
 			host()->onPeerHashes(this, hashes);
 		m_syncHashNumber += itemCount;
@@ -332,9 +271,9 @@ bool EthereumPeer::interpret(unsigned _id, RLP const& _r)
 		for (unsigned i = 0; i < min(count, c_maxBlocks); ++i)
 		{
 			auto h = _r[i].toHash<h256>();
-			if (host()->m_chain.isKnown(h))
+			if (host()->chain().isKnown(h))
 			{
-				rlp += host()->m_chain.block(_r[i].toHash<h256>());
+				rlp += host()->chain().block(_r[i].toHash<h256>());
 				++n;
 			}
 		}
@@ -351,54 +290,21 @@ bool EthereumPeer::interpret(unsigned _id, RLP const& _r)
 	}
 	case BlocksPacket:
 	{
+		if (m_asking != Asking::Blocks)
+			clog(NetWarn) << "Peer giving us blocks when we didn't ask for them.";
+		else
+		{
+			setAsking(Asking::Nothing);
 			host()->onPeerBlocks(this, _r);
+		}
 		break;
 	}
 	case NewBlockPacket:
 	{
-		auto h = BlockInfo::headerHash(_r[0].data());
-		clog(NetMessageSummary) << "NewBlock: " << h;
-
-		if (_r.itemCount() != 2)
-			disable("NewBlock without 2 data fields.");
-		else
-		{
-			switch (host()->m_bq.import(_r[0].data(), host()->m_chain))
-			{
-			case ImportResult::Success:
-				addRating(100);
-				break;
-			case ImportResult::FutureTime:
-				//TODO: Rating dependent on how far in future it is.
-				break;
-
-			case ImportResult::Malformed:
-			case ImportResult::BadChain:
-				disable("Malformed block received.");
-				return true;
-
-			case ImportResult::AlreadyInChain:
-			case ImportResult::AlreadyKnown:
-				break;
-
-			case ImportResult::UnknownParent:
-				clog(NetMessageSummary) << "Received block with no known parent. Resyncing...";
-				setNeedsSyncing(h, _r[1].toInt<u256>());
-				break;
-			default:;
-			}
-
-			DEV_GUARDED(x_knownBlocks)
-				m_knownBlocks.insert(h);
-		}
+		host()->onPeerNewBlock(this, _r);
 		break;
 	}
 	case NewBlockHashesPacket:
-	{
-		clog(NetMessageSummary) << "NewBlockHashes";
-		if (host()->isSyncing())
-			clog(NetMessageSummary) << "Ignoring since we're already downloading.";
-		else
 	{
 		unsigned itemCount = _r.itemCount();
 		clog(NetMessageSummary) << "BlockHashes (" << dec << itemCount << "entries)" << (itemCount ? "" : ": NoMoreHashes");
@@ -407,11 +313,7 @@ bool EthereumPeer::interpret(unsigned _id, RLP const& _r)
 		for (unsigned i = 0; i < itemCount; ++i)
 			hashes[i] = _r[i].toHash<h256>();
 
-			clog(NetNote) << "Not syncing and new block hash discovered: syncing without help.";
-			host()->onPeerHashes(this, hashes);
-			host()->onPeerDoneHashes(this, true);
-			return true;
-		}
+		host()->onPeerNewHashes(this, hashes);
 		break;
 	}
 	default:

libethereum/EthereumPeer.h

@@ -49,11 +49,11 @@ namespace eth
  */
 class EthereumPeer: public p2p::Capability
 {
-	friend class EthereumHost;
+	friend class EthereumHost; //TODO: remove this
 
 public:
 	/// Basic constructor.
-	EthereumPeer(p2p::Session* _s, p2p::HostCapabilityFace* _h, unsigned _i);
+	EthereumPeer(p2p::Session* _s, p2p::HostCapabilityFace* _h, unsigned _i, p2p::CapDesc const& _cap);
 
 	/// Basic destructor.
 	virtual ~EthereumPeer();
@@ -70,10 +70,16 @@ public:
 	/// What is the ethereum subprotocol host object.
 	EthereumHost* host() const;
 
+	/// Abort sync and reset fetch
 	void setIdle();
-	void requestState();
+
+	/// Request hashes. Uses hash download manager to get hash number. v61+ protocol version only
 	void requestHashes();
+
+	/// Request hashes for given parent hash.
 	void requestHashes(h256 const& _lastHash);
+
+	/// Request blocks. Uses block download manager.
 	void requestBlocks();
 
 private:
@@ -82,6 +88,9 @@ private:
 	/// Interpret an incoming message.
 	virtual bool interpret(unsigned _id, RLP const& _r);
 
+	/// Request status. Called from constructor
+	void requestStatus();
+
 	/// Abort the sync operation.
 	void abortSync();
 
@@ -91,24 +100,18 @@ private:
 	/// Update our asking state.
 	void setAsking(Asking _g);
 
-	/// Update our syncing requirements state.
-	void setNeedsSyncing(h256 _latestHash, u256 _td);
-	void resetNeedsSyncing() { setNeedsSyncing(h256(), 0); }
-
 	/// Do we presently need syncing with this peer?
 	bool needsSyncing() const { return !!m_latestHash; }
 
 	/// Are we presently syncing with this peer?
 	bool isSyncing() const;
 
-	/// Check whether the session should bother grabbing the peer's blocks.
-	bool shouldGrabBlocks() const;
-
 	/// Runs period checks to check up on the peer.
 	void tick();
 
 	/// Peer's protocol version.
 	unsigned m_protocolVersion;
+
 	/// Peer's network id.
 	u256 m_networkId;
 
@@ -117,28 +120,24 @@ private:
 	/// When we asked for it. Allows a time out.
 	std::chrono::system_clock::time_point m_lastAsk;
 
-	/// Whether this peer is in the process of syncing or not. Only one peer can be syncing at once.
-	bool m_isSyncing = false;
-
 	/// These are determined through either a Status message or from NewBlock.
 	h256 m_latestHash;						///< Peer's latest block's hash that we know about or default null value if no need to sync.
 	u256 m_totalDifficulty;					///< Peer's latest block's total difficulty.
 	h256 m_genesisHash;						///< Peer's genesis hash
-	/// Once a sync is started on this peer, they are cleared and moved into m_syncing*.
+	u256 m_latestBlockNumber;				///< Number of the latest block this peer has
 
 	/// This is built as we ask for hashes. Once no more hashes are given, we present this to the
 	/// host who initialises the DownloadMan and m_sub becomes active for us to begin asking for blocks.
-	h256s m_syncingNeededBlocks;				///< The blocks that we should download from this peer.
-	h256 m_syncingLastReceivedHash;				///< Hash most recently received from peer.
-	h256 m_syncingLatestHash;					///< Peer's latest block's hash, as of the current sync.
-	u256 m_syncingTotalDifficulty;				///< Peer's latest block's total difficulty, as of the current sync.
-	unsigned m_expectedHashes = 0;				///< Estimated Upper bound of hashes to expect from this peer.
-	unsigned m_syncHashNumber = 0;
+	unsigned m_expectedHashes = 0;				///< Estimated upper bound of hashes to expect from this peer.
+	unsigned m_syncHashNumber = 0;				///< Number of latest hash we sync to
 
 	/// Once we're asking for blocks, this becomes in use.
 	DownloadSub m_sub;
+
+	/// Once we're asking for hashes, this becomes in use.
 	HashDownloadSub m_hashSub;
 
+	u256 m_peerCapabilityVersion;			///< Protocol version this peer supports received as capability
 	/// Have we received a GetTransactions packet that we haven't yet answered?
 	bool m_requireTransactions = false;
 
@@ -146,7 +145,6 @@ private:
 	h256Hash m_knownBlocks;					///< Blocks that the peer already knows about (that don't need to be sent to them).
 	Mutex x_knownTransactions;
 	h256Hash m_knownTransactions;			///< Transactions that the peer already knows of.
-
 };
 
 }

libp2p/Capability.h

@@ -44,7 +44,6 @@ public:
 */
 	Session* session() const { return m_session; }
 	HostCapabilityFace* hostCapability() const { return m_host; }
-	bool enabled() { return m_enabled; }
 
 protected:
 	virtual bool interpret(unsigned _id, RLP const&) = 0;

libp2p/Host.cpp

@@ -202,6 +202,10 @@ void Host::startPeerSession(Public const& _id, RLP const& _rlp, RLPXFrameIO* _io
 	// clang error (previously: ... << hex << caps ...)
 	// "'operator<<' should be declared prior to the call site or in an associated namespace of one of its arguments"
 	stringstream capslog;
+
+	if (caps.size() > 1)
+		caps.erase(remove_if(caps.begin(), caps.end(), [&](CapDesc const& _r){ return any_of(caps.begin(), caps.end(), [&](CapDesc const& _o){ return _r.first == _o.first && _o.second > _r.second; }); }), caps.end());
+
 	for (auto cap: caps)
 		capslog << "(" << cap.first << "," << dec << cap.second << ")";
 	clog(NetMessageSummary) << "Hello: " << clientVersion << "V[" << protocolVersion << "]" << _id << showbase << capslog.str() << dec << listenPort;
@@ -237,7 +241,7 @@ void Host::startPeerSession(Public const& _id, RLP const& _rlp, RLPXFrameIO* _io
 		for (auto const& i: caps)
 			if (haveCapability(i))
 			{
-				ps->m_capabilities[i] = shared_ptr<Capability>(m_capabilities[i]->newPeerCapability(ps.get(), o));
+				ps->m_capabilities[i] = shared_ptr<Capability>(m_capabilities[i]->newPeerCapability(ps.get(), o, i));
 				o += m_capabilities[i]->messageCount();
 			}
 		ps->start();

libp2p/HostCapability.h

@@ -53,7 +53,7 @@ protected:
 	virtual u256 version() const = 0;
 	CapDesc capDesc() const { return std::make_pair(name(), version()); }
 	virtual unsigned messageCount() const = 0;
-	virtual Capability* newPeerCapability(Session* _s, unsigned _idOffset) = 0;
+	virtual Capability* newPeerCapability(Session* _s, unsigned _idOffset, CapDesc const& _cap) = 0;
 
 	virtual void onStarting() {}
 	virtual void onStopping() {}
@@ -77,7 +77,7 @@ protected:
 	virtual std::string name() const { return PeerCap::name(); }
 	virtual u256 version() const { return PeerCap::version(); }
 	virtual unsigned messageCount() const { return PeerCap::messageCount(); }
-	virtual Capability* newPeerCapability(Session* _s, unsigned _idOffset) { return new PeerCap(_s, this, _idOffset); }
+	virtual Capability* newPeerCapability(Session* _s, unsigned _idOffset, CapDesc const& _cap) { return new PeerCap(_s, this, _idOffset, _cap); }
 };
 
 }

libwhisper/WhisperPeer.cpp

@@ -29,7 +29,7 @@ using namespace dev;
 using namespace dev::p2p;
 using namespace dev::shh;
 
-WhisperPeer::WhisperPeer(Session* _s, HostCapabilityFace* _h, unsigned _i): Capability(_s, _h, _i)
+WhisperPeer::WhisperPeer(Session* _s, HostCapabilityFace* _h, unsigned _i, CapDesc const&): Capability(_s, _h, _i)
 {
 	RLPStream s;
 	sealAndSend(prep(s, StatusPacket, 1) << version());

libwhisper/WhisperPeer.h

@@ -42,6 +42,7 @@ using p2p::Session;
 using p2p::HostCapabilityFace;
 using p2p::HostCapability;
 using p2p::Capability;
+using p2p::CapDesc;
 
 /**
  */
@@ -50,7 +51,7 @@ class WhisperPeer: public Capability
 	friend class WhisperHost;
 
 public:
-	WhisperPeer(Session* _s, HostCapabilityFace* _h, unsigned _i);
+	WhisperPeer(Session* _s, HostCapabilityFace* _h, unsigned _i, CapDesc const& _cap);
 	virtual ~WhisperPeer();
 
 	static std::string name() { return "shh"; }

test/libp2p/capability.cpp

@@ -49,7 +49,7 @@ struct VerbosityHolder
 class TestCapability: public Capability
 {
 public:
-	TestCapability(Session* _s, HostCapabilityFace* _h, unsigned _idOffset): Capability(_s, _h, _idOffset), m_cntReceivedMessages(0), m_testSum(0) {}
+	TestCapability(Session* _s, HostCapabilityFace* _h, unsigned _idOffset, CapDesc const&): Capability(_s, _h, _idOffset), m_cntReceivedMessages(0), m_testSum(0) {}
 	virtual ~TestCapability() {}
 	int countReceivedMessages() { return m_cntReceivedMessages; }
 	int testSum() { return m_testSum; }