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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 AccountDiff.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <libdevcore/Common.h>
#include <libdevcore/Diff.h>
#include <libethcore/CommonEth.h>
namespace dev
{
namespace eth
{
/// Type of change that an account can have from state to state.
enum class AccountChange
{
None, ///< Nothing changed at all.
Creation, ///< Account came into existance.
Deletion, ///< Account was deleted.
Intrinsic, ///< Account was already in existance and some internal aspect of the account altered such as balance, nonce or storage.
CodeStorage, ///< Account was already in existance and the code of the account changed.
All ///< Account was already in existance and all aspects of the account changed.
};
/// @returns a three-character code that expresses the type of change.
char const* lead(AccountChange _c);
/**
* @brief Stores the difference between two accounts (typically the same account at two times).
*
* In order to determine what about an account has altered, this struct can be used to specify
* alterations. Use changed() and changeType() to determine what, if anything, is different.
*
* Five members are accessible: to determine the nature of the changes.
*/
struct AccountDiff
{
/// @returns true if the account has changed at all.
inline bool changed() const { return storage.size() || code || nonce || balance || exist; }
/// @returns a three-character code that expresses the change.
AccountChange changeType() const;
Diff<bool> exist; ///< The account's existance; was it created/deleted or not?
Diff<u256> balance; ///< The account's balance; did it alter?
Diff<u256> nonce; ///< The account's nonce; did it alter?
std::map<u256, Diff<u256>> storage; ///< The account's storage addresses; each has its own Diff.
Diff<bytes> code; ///< The account's code; in general this should only have changed if exist also changed.
};
/**
* @brief Stores the difference between two states; this is just their encumbent accounts.
*/
struct StateDiff
{
std::map<Address, AccountDiff> accounts; ///< The state's account changes; each has its own AccountDiff.
};
}
/// Simple stream output for the StateDiff.
std::ostream& operator<<(std::ostream& _out, dev::eth::StateDiff const& _s);
/// Simple stream output for the AccountDiff.
std::ostream& operator<<(std::ostream& _out, dev::eth::AccountDiff const& _s);
}