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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.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <mutex>
#include <map>
#include <vector>
#include <set>
#include <memory>
#include <utility>
#include <thread>
#include <libdevcore/Guards.h>
#include <libdevcore/Worker.h>
#include <libdevcore/RangeMask.h>
#include <libethcore/CommonEth.h>
#include <libp2p/Common.h>
#include "CommonNet.h"
#include "EthereumPeer.h"
#include "DownloadMan.h"
namespace dev
{
class RLPStream;
namespace eth
{
class TransactionQueue;
class BlockQueue;
/**
* @brief The EthereumHost class
* @warning None of this is thread-safe. You have been warned.
* @doWork Syncs to peers and sends new blocks and transactions.
*/
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);
/// Will block on network process events.
virtual ~EthereumHost();
unsigned protocolVersion() const { return c_protocolVersion; }
u256 networkId() const { return m_networkId; }
void setNetworkId(u256 _n) { m_networkId = _n; }
void reset();
DownloadMan const& downloadMan() const { return m_man; }
bool isSyncing() const { return !!m_syncer; }
bool isBanned(p2p::NodeId _id) const { return !!m_banned.count(_id); }
private:
/// Session is tell us that we may need (re-)syncing with the peer.
void noteNeedsSyncing(EthereumPeer* _who);
/// Called when the peer can no longer provide us with any needed blocks.
void noteDoneBlocks(EthereumPeer* _who, bool _clemency);
/// Sync with the BlockChain. It might contain one of our mined blocks, we might have new candidates from the network.
void doWork();
void maintainTransactions();
void maintainBlocks(h256 _currentBlock);
/// Get a bunch of needed blocks.
/// Removes them from our list of needed blocks.
/// @returns empty if there's no more blocks left to fetch, otherwise the blocks to fetch.
h256Set neededBlocks(h256Set const& _exclude);
/// Check to see if the network peer-state initialisation has happened.
bool isInitialised() const { return m_latestBlockSent; }
/// Initialises the network peer-state, doing the stuff that needs to be once-only. @returns true if it really was first.
bool ensureInitialised();
virtual void onStarting() { startWorking(); }
virtual void onStopping() { stopWorking(); }
void changeSyncer(EthereumPeer* _ignore);
BlockChain const& m_chain;
TransactionQueue& m_tq; ///< Maintains a list of incoming transactions not yet in a block on the blockchain.
BlockQueue& m_bq; ///< Maintains a list of incoming blocks not yet on the blockchain (to be imported).
u256 m_networkId;
EthereumPeer* m_syncer = nullptr; // TODO: switch to weak_ptr
DownloadMan m_man;
h256 m_latestBlockSent;
h256Set m_transactionsSent;
std::set<p2p::NodeId> m_banned;
};
}
}