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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 TransactionQueue.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <functional>
#include <libdevcore/Common.h>
#include <libdevcore/Guards.h>
#include <libdevcore/Log.h>
#include <libethcore/Common.h>
#include "Transaction.h"
namespace dev
{
namespace eth
{
class BlockChain;
struct TransactionQueueChannel: public LogChannel { static const char* name(); static const int verbosity = 4; };
#define ctxq dev::LogOutputStream<dev::eth::TransactionQueueChannel, true>()
enum class IfDropped { Ignore, Retry };
/**
* @brief A queue of Transactions, each stored as RLP.
* @threadsafe
*/
class TransactionQueue
{
public:
using ImportCallback = std::function<void(ImportResult)>;
ImportResult import(Transaction const& _tx, ImportCallback const& _cb = ImportCallback(), IfDropped _ik = IfDropped::Ignore);
ImportResult import(bytes const& _tx, ImportCallback const& _cb = ImportCallback(), IfDropped _ik = IfDropped::Ignore) { return import(&_tx, _cb, _ik); }
ImportResult import(bytesConstRef _tx, ImportCallback const& _cb = ImportCallback(), IfDropped _ik = IfDropped::Ignore);
void drop(h256 const& _txHash);
std::unordered_map<h256, Transaction> transactions() const { ReadGuard l(m_lock); return m_current; }
std::pair<unsigned, unsigned> items() const { ReadGuard l(m_lock); return std::make_pair(m_current.size(), m_unknown.size()); }
u256 maxNonce(Address const& _a) const;
void setFuture(std::pair<h256, Transaction> const& _t);
void noteGood(std::pair<h256, Transaction> const& _t);
void clear() { WriteGuard l(m_lock); m_known.clear(); m_current.clear(); m_unknown.clear(); }
template <class T> Handler onReady(T const& _t) { return m_onReady.add(_t); }
private:
ImportResult check_WITH_LOCK(h256 const& _h, IfDropped _ik);
ImportResult manageImport_WITH_LOCK(h256 const& _h, Transaction const& _transaction, ImportCallback const& _cb);
void insertCurrent_WITH_LOCK(std::pair<h256, Transaction> const& _p);
bool removeCurrent_WITH_LOCK(h256 const& _txHash);
mutable SharedMutex m_lock; ///< General lock.
h256Hash m_known; ///< Hashes of transactions in both sets.
std::unordered_map<h256, Transaction> m_current; ///< Map of SHA3(tx) to tx.
std::unordered_multimap<Address, std::pair<h256, Transaction>> m_unknown; ///< For transactions that have a future nonce; we map their sender address to the tx stuff, and insert once the sender has a valid TX.
std::unordered_map<h256, std::function<void(ImportResult)>> m_callbacks; ///< Called once.
h256Hash m_dropped; ///< Transactions that have previously been dropped.
std::multimap<Address, h256> m_senders; ///< Mapping from the sender address to the transaction hash; useful for determining the nonce of a given sender.
Signal m_onReady; ///< Called when a subsequent call to import transactions will return a non-empty container. Be nice and exit fast.
};
}
}