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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 Transaction.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <libdevcore/RLP.h>
#include <libdevcrypto/SHA3.h>
#include <libethcore/CommonEth.h>
namespace dev
{
namespace eth
{
/// Named-boolean type to encode whether a signature be included in the serialisation process.
enum IncludeSignature
{
WithoutSignature = 0, ///< Do not include a signature.
WithSignature = 1, ///< Do include a signature.
};
/// Encodes a transaction, ready to be exported to or freshly imported from RLP.
class Transaction
{
public:
/// Constructs a null transaction.
Transaction() {}
/// Constructs a signed message-call transaction.
Transaction(u256 _value, u256 _gasPrice, u256 _gas, Address const& _dest, bytes const& _data, u256 _nonce, Secret const& _secret): m_type(MessageCall), m_nonce(_nonce), m_value(_value), m_receiveAddress(_dest), m_gasPrice(_gasPrice), m_gas(_gas), m_data(_data) { sign(_secret); }
/// Constructs a signed contract-creation transaction.
Transaction(u256 _value, u256 _gasPrice, u256 _gas, bytes const& _data, u256 _nonce, Secret const& _secret): m_type(ContractCreation), m_nonce(_nonce), m_value(_value), m_gasPrice(_gasPrice), m_gas(_gas), m_data(_data) { sign(_secret); }
/// Constructs an unsigned message-call transaction.
Transaction(u256 _value, u256 _gasPrice, u256 _gas, Address const& _dest, bytes const& _data): m_type(MessageCall), m_value(_value), m_receiveAddress(_dest), m_gasPrice(_gasPrice), m_gas(_gas), m_data(_data) {}
/// Constructs an unsigned contract-creation transaction.
Transaction(u256 _value, u256 _gasPrice, u256 _gas, bytes const& _data): m_type(ContractCreation), m_value(_value), m_gasPrice(_gasPrice), m_gas(_gas), m_data(_data) {}
/// Constructs a transaction from the given RLP.
explicit Transaction(bytesConstRef _rlp, bool _checkSender = false);
/// Constructs a transaction from the given RLP.
explicit Transaction(bytes const& _rlp, bool _checkSender = false): Transaction(&_rlp, _checkSender) {}
/// Checks equality of transactions.
bool operator==(Transaction const& _c) const { return m_type == _c.m_type && (m_type == ContractCreation || m_receiveAddress == _c.m_receiveAddress) && m_value == _c.m_value && m_data == _c.m_data; }
/// Checks inequality of transactions.
bool operator!=(Transaction const& _c) const { return !operator==(_c); }
/// @returns sender of the transaction from the signature (and hash).
Address sender() const;
/// Like sender() but will never throw. @returns a null Address if the signature is invalid.
Address safeSender() const noexcept;
/// @returns true if transaction is non-null.
operator bool() const { return m_type != NullTransaction; }
/// @returns true if transaction is contract-creation.
bool isCreation() const { return m_type == ContractCreation; }
/// @returns true if transaction is message-call.
bool isMessageCall() const { return m_type == MessageCall; }
/// Serialises this transaction to an RLPStream.
void streamRLP(RLPStream& _s, IncludeSignature _sig = WithSignature) const;
/// @returns the RLP serialisation of this transaction.
bytes rlp(IncludeSignature _sig = WithSignature) const { RLPStream s; streamRLP(s, _sig); return s.out(); }
/// @returns the SHA3 hash of the RLP serialisation of this transaction.
h256 sha3(IncludeSignature _sig = WithSignature) const { RLPStream s; streamRLP(s, _sig); return dev::sha3(s.out()); }
/// @returns the amount of ETH to be transferred by this (message-call) transaction, in Wei. Synonym for endowment().
u256 value() const { return m_value; }
/// @returns the amount of ETH to be endowed by this (contract-creation) transaction, in Wei. Synonym for value().
u256 endowment() const { return m_value; }
/// @returns the base fee and thus the implied exchange rate of ETH to GAS.
u256 gasPrice() const { return m_gasPrice; }
/// @returns the total gas to convert, paid for from sender's account. Any unused gas gets refunded once the contract is ended.
u256 gas() const { return m_gas; }
/// @returns the receiving address of the message-call transaction (undefined for contract-creation transactions).
Address receiveAddress() const { return m_receiveAddress; }
/// @returns the data associated with this (message-call) transaction. Synonym for initCode().
bytes const& data() const { return m_data; }
/// @returns the initialisation code associated with this (contract-creation) transaction. Synonym for data().
bytes const& initCode() const { return m_data; }
/// @returns the transaction-count of the sender.
u256 nonce() const { return m_nonce; }
/// @returns the signature of the transaction. Encodes the sender.
SignatureStruct const& signature() const { return m_vrs; }
private:
/// Type of transaction.
enum Type
{
NullTransaction, ///< Null transaction.
ContractCreation, ///< Transaction to create contracts - receiveAddress() is ignored.
MessageCall ///< Transaction to invoke a message call - receiveAddress() is used.
};
void sign(Secret _priv); ///< Sign the transaction.
Type m_type = NullTransaction; ///< Is this a contract-creation transaction or a message-call transaction?
u256 m_nonce; ///< The transaction-count of the sender.
u256 m_value; ///< The amount of ETH to be transferred by this transaction. Called 'endowment' for contract-creation transactions.
Address m_receiveAddress; ///< The receiving address of the transaction.
u256 m_gasPrice; ///< The base fee and thus the implied exchange rate of ETH to GAS.
u256 m_gas; ///< The total gas to convert, paid for from sender's account. Any unused gas gets refunded once the contract is ended.
bytes m_data; ///< The data associated with the transaction, or the initialiser if it's a creation transaction.
SignatureStruct m_vrs; ///< The signature of the transaction. Encodes the sender.
mutable Address m_sender; ///< Cached sender, determined from signature.
};
/// Nice name for vector of Transaction.
using Transactions = std::vector<Transaction>;
/// Simple human-readable stream-shift operator.
inline std::ostream& operator<<(std::ostream& _out, Transaction const& _t)
{
_out << "{";
if (_t.receiveAddress())
_out << _t.receiveAddress().abridged();
else
_out << "[CREATE]";
_out << "/" << _t.nonce() << "$" << _t.value() << "+" << _t.gas() << "@" << _t.gasPrice();
try
{
_out << "<-" << _t.sender().abridged();
}
catch (...) {}
_out << " #" << _t.data().size() << "}";
return _out;
}
}
}