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158 lines
6.1 KiB
158 lines
6.1 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 EthereumHost.h
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#pragma once
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#include <mutex>
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#include <unordered_map>
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#include <vector>
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#include <unordered_set>
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#include <memory>
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#include <utility>
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#include <thread>
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#include <libdevcore/Guards.h>
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#include <libdevcore/Worker.h>
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#include <libdevcore/RangeMask.h>
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#include <libethcore/Common.h>
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#include <libp2p/Common.h>
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#include "CommonNet.h"
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#include "EthereumPeer.h"
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#include "DownloadMan.h"
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namespace dev
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{
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class RLPStream;
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namespace eth
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{
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class TransactionQueue;
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class BlockQueue;
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/**
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* @brief The EthereumHost class
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* @warning None of this is thread-safe. You have been warned.
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* @doWork Syncs to peers and sends new blocks and transactions.
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*/
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class EthereumHost: public p2p::HostCapability<EthereumPeer>, Worker
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{
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public:
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/// Start server, but don't listen.
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EthereumHost(BlockChain const& _ch, TransactionQueue& _tq, BlockQueue& _bq, u256 _networkId);
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/// Will block on network process events.
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virtual ~EthereumHost();
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unsigned protocolVersion() const { return c_protocolVersion; }
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u256 networkId() const { return m_networkId; }
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void setNetworkId(u256 _n) { m_networkId = _n; }
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void reset();
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DownloadMan const& downloadMan() const { return m_man; }
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bool isSyncing() const { RecursiveGuard l(x_sync); return isSyncing_UNSAFE(); }
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bool isBanned(p2p::NodeId const& _id) const { return !!m_banned.count(_id); }
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void noteNewTransactions() { m_newTransactions = true; }
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void noteNewBlocks() { m_newBlocks = true; }
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void onPeerStatus(EthereumPeer* _peer); ///< Called by peer to report status
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void onPeerBlocks(EthereumPeer* _peer, RLP const& _r); ///< Called by peer once it has new blocks during syn
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void onPeerNewBlock(EthereumPeer* _peer, RLP const& _r); ///< Called by peer once it has new blocks
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void onPeerNewHashes(EthereumPeer* _peer, h256s const& _hashes); ///< Called by peer once it has new hashes
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void onPeerHashes(EthereumPeer* _peer, h256s const& _hashes); ///< Called by peer once it has another sequential block of hashes during sync
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void onPeerTransactions(EthereumPeer* _peer, RLP const& _r); ///< Called by peer when it has new transactions
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void onPeerAborting(EthereumPeer* _peer); ///< Called by peer when it is disconnecting
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DownloadMan& downloadMan() { return m_man; }
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HashDownloadMan& hashDownloadMan() { return m_hashMan; }
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BlockChain const& chain() { return m_chain; }
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HashChainStatus status();
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static unsigned const c_oldProtocolVersion;
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private:
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std::tuple<std::vector<std::shared_ptr<EthereumPeer>>, std::vector<std::shared_ptr<EthereumPeer>>, std::vector<std::shared_ptr<p2p::Session>>> randomSelection(unsigned _percent = 25, std::function<bool(EthereumPeer*)> const& _allow = [](EthereumPeer const*){ return true; });
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void foreachPeerPtr(std::function<void(std::shared_ptr<EthereumPeer>)> const& _f) const;
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void foreachPeer(std::function<void(EthereumPeer*)> const& _f) const;
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bool isSyncing_UNSAFE() const;
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/// Sync with the BlockChain. It might contain one of our mined blocks, we might have new candidates from the network.
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void doWork();
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void maintainTransactions();
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void maintainBlocks(h256 const& _currentBlock);
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/// Get a bunch of needed blocks.
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/// Removes them from our list of needed blocks.
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/// @returns empty if there's no more blocks left to fetch, otherwise the blocks to fetch.
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h256Hash neededBlocks(h256Hash const& _exclude);
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/// Check to see if the network peer-state initialisation has happened.
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bool isInitialised() const { return (bool)m_latestBlockSent; }
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/// Initialises the network peer-state, doing the stuff that needs to be once-only. @returns true if it really was first.
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bool ensureInitialised();
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virtual void onStarting() { startWorking(); }
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virtual void onStopping() { stopWorking(); }
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void continueSync(); /// Find something to do for all peers
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void continueSync(EthereumPeer* _peer); /// Find some work to do for a peer
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void onPeerDoneHashes(EthereumPeer* _peer, bool _new); /// Called when done downloading hashes from peer
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void onPeerHashes(EthereumPeer* _peer, h256s const& _hashes, bool _complete);
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bool peerShouldGrabBlocks(EthereumPeer* _peer) const;
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bool peerShouldGrabChain(EthereumPeer* _peer) const;
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bool peerCanHelp(EthereumPeer* _peer) const;
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void estimatePeerHashes(EthereumPeer* _peer);
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BlockChain const& m_chain;
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TransactionQueue& m_tq; ///< Maintains a list of incoming transactions not yet in a block on the blockchain.
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BlockQueue& m_bq; ///< Maintains a list of incoming blocks not yet on the blockchain (to be imported).
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u256 m_networkId;
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DownloadMan m_man;
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HashDownloadMan m_hashMan;
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h256 m_latestBlockSent;
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h256Hash m_transactionsSent;
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std::unordered_set<p2p::NodeId> m_banned;
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bool m_newTransactions = false;
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bool m_newBlocks = false;
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mutable RecursiveMutex x_sync;
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bool m_needSyncHashes = true; ///< Indicates if need to downlad hashes
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bool m_needSyncBlocks = true; ///< Indicates if we still need to download some blocks
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h256 m_syncingLatestHash; ///< Latest block's hash, as of the current sync.
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u256 m_syncingTotalDifficulty; ///< Latest block's total difficulty, as of the current sync.
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h256s m_hashes; ///< List of hashes with unknown block numbers. Used for PV60 chain downloading and catching up to a particular unknown
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unsigned m_estimatedHashes = 0; ///< Number of estimated hashes for the last peer over PV60. Used for status reporting only.
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bool m_syncingV61 = false; ///< True if recent activity was over pv61+. Used for status reporting only.
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};
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}
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}
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