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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 Client.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <thread>
#include <mutex>
#include <atomic>
#include "Common.h"
#include "BlockChain.h"
#include "TransactionQueue.h"
#include "State.h"
#include "Dagger.h"
#include "PeerNetwork.h"
namespace eth
{
struct MineProgress
{
uint requirement;
uint best;
uint current;
};
class Client;
class ClientGuard
{
public:
inline ClientGuard(Client* _c);
inline ~ClientGuard();
private:
Client* m_client;
};
enum ClientWorkState
{
Active = 0,
Deleting,
Deleted
};
class VersionChecker
{
public:
VersionChecker(std::string const& _dbPath, unsigned _protocolVersion);
void setOk();
bool ok() const { return m_ok; }
private:
bool m_ok;
std::string m_path;
unsigned m_protocolVersion;
};
class Client
{
public:
/// Constructor.
explicit Client(std::string const& _clientVersion, Address _us = Address(), std::string const& _dbPath = std::string());
/// Destructor.
~Client();
/// Submits the given message-call transaction.
void transact(Secret _secret, u256 _value, Address _dest, bytes const& _data = bytes(), u256 _gas = 10000, u256 _gasPrice = 10 * szabo);
/// Submits a new contract-creation transaction.
/// @returns the new contract's address (assuming it all goes through).
Address transact(Secret _secret, u256 _endowment, bytes const& _code, bytes const& _init = bytes(), u256 _gas = 10000, u256 _gasPrice = 10 * szabo);
/// Makes the given call. Nothing is recorded into the state. TODO
// bytes call(Secret _secret, u256 _amount, u256 _gasPrice, Address _dest, u256 _gas, bytes _data = bytes());
/// Requires transactions involving this address be queued for inspection.
void setInterest(Address _dest);
/// @returns incoming minable transactions that we wanted to be notified of. Clears the queue.
Transactions pendingQueue() { ClientGuard g(this); return m_tq.interestQueue(); }
/// @returns alterations in state of a mined block that we wanted to be notified of. Clears the queue.
std::vector<std::pair<Address, AddressState>> minedQueue() { ClientGuard g(this); return m_bc.interestQueue(); }
// Not yet - probably best as using some sort of signals implementation.
/// Calls @a _f when a valid transaction is received that involves @a _dest and once per such transaction.
// void onPending(Address _dest, function<void(Transaction)> const& _f);
/// Calls @a _f when a transaction is mined that involves @a _dest and once per change.
// void onConfirmed(Address _dest, function<void(Transaction, AddressState)> const& _f);
// Informational stuff:
/// Locks/unlocks the state/blockChain/transactionQueue for access.
void lock();
void unlock();
/// Determines whether at least one of the state/blockChain/transactionQueue has changed since the last call to changed().
bool changed() const { auto ret = m_changed; m_changed = false; return ret; }
/// Get the object representing the current state of Ethereum.
State const& state() const { return m_preMine; }
/// Get the object representing the current state of Ethereum.
State const& postState() const { return m_postMine; }
/// Get the object representing the current canonical blockchain.
BlockChain const& blockChain() const { return m_bc; }
/// Get a map containing each of the pending transactions.
Transactions const& pending() const { return m_postMine.pending(); }
void setClientVersion(std::string const& _name) { m_clientVersion = _name; }
// Network stuff:
/// Get information on the current peer set.
std::vector<PeerInfo> peers();
/// Same as peers().size(), but more efficient.
size_t peerCount() const;
/// Start the network subsystem.
void startNetwork(unsigned short _listenPort = 30303, std::string const& _remoteHost = std::string(), unsigned short _remotePort = 30303, NodeMode _mode = NodeMode::Full, unsigned _peers = 5, std::string const& _publicIP = std::string(), bool _upnp = true);
/// Connect to a particular peer.
void connect(std::string const& _seedHost, unsigned short _port = 30303);
/// Stop the network subsystem.
void stopNetwork();
/// Is the network subsystem up?
bool haveNetwork() { return !!m_net; }
/// Get access to the peer server object. This will be null if the network isn't online.
PeerServer* peerServer() const { return m_net.get(); }
// Mining stuff:
/// Set the coinbase address.
void setAddress(Address _us) { m_preMine.setAddress(_us); }
/// Get the coinbase address.
Address address() const { return m_preMine.address(); }
/// Start mining.
void startMining();
/// Stop mining.
void stopMining();
/// Are we mining now?
bool isMining() { return m_doMine; }
/// Check the progress of the mining.
MineProgress miningProgress() const { return m_mineProgress; }
private:
void work();
std::string m_clientVersion; ///< Our end-application client's name/version.
VersionChecker m_vc; ///< Dummy object to check & update the protocol version.
BlockChain m_bc; ///< Maintains block database.
TransactionQueue m_tq; ///< Maintains list of incoming transactions not yet on the block chain.
Overlay m_stateDB; ///< Acts as the central point for the state database, so multiple States can share it.
State m_preMine; ///< The present state of the client.
State m_postMine; ///< The state of the client which we're mining (i.e. it'll have all the rewards added).
std::unique_ptr<PeerServer> m_net; ///< Should run in background and send us events when blocks found and allow us to send blocks as required.
std::unique_ptr<std::thread> m_work;///< The work thread.
std::recursive_mutex m_lock;
std::atomic<ClientWorkState> m_workState;
bool m_doMine = false; ///< Are we supposed to be mining?
MineProgress m_mineProgress;
mutable bool m_restartMining = false;
mutable bool m_changed;
};
inline ClientGuard::ClientGuard(Client* _c): m_client(_c)
{
m_client->lock();
}
inline ClientGuard::~ClientGuard()
{
m_client->unlock();
}
}