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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 BlockInfo.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#if !ETH_LANGUAGES
#include <libdevcore/Common.h>
#include <libdevcore/RLP.h>
#include <libdevcrypto/TrieDB.h>
#include "ProofOfWork.h"
#include "Exceptions.h"
#include "BlockInfo.h"
using namespace std;
using namespace dev;
using namespace dev::eth;
u256 dev::eth::c_genesisDifficulty = (u256)1 << 17;
BlockInfo::BlockInfo(): timestamp(Invalid256)
{
}
BlockInfo::BlockInfo(bytesConstRef _block)
{
populate(_block);
}
BlockInfo BlockInfo::fromHeader(bytesConstRef _block)
{
BlockInfo ret;
ret.populateFromHeader(RLP(_block));
return ret;
}
h256 BlockInfo::headerHashWithoutNonce() const
{
RLPStream s;
fillStream(s, false);
return sha3(s.out());
}
void BlockInfo::fillStream(RLPStream& _s, bool _nonce) const
{
_s.appendList(_nonce ? 13 : 12) << parentHash << sha3Uncles << coinbaseAddress;
_s.append(stateRoot, false, true).append(transactionsRoot, false, true);
_s << difficulty << number << minGasPrice << gasLimit << gasUsed << timestamp << extraData;
if (_nonce)
_s << nonce;
}
h256 BlockInfo::headerHash(bytesConstRef _block)
{
return sha3(RLP(_block)[0].data());
}
void BlockInfo::populateFromHeader(RLP const& _header, bool _checkNonce)
{
hash = dev::eth::sha3(_header.data());
int field = 0;
try
{
parentHash = _header[field = 0].toHash<h256>();
sha3Uncles = _header[field = 1].toHash<h256>();
coinbaseAddress = _header[field = 2].toHash<Address>();
stateRoot = _header[field = 3].toHash<h256>();
transactionsRoot = _header[field = 4].toHash<h256>();
difficulty = _header[field = 5].toInt<u256>();
number = _header[field = 6].toInt<u256>();
minGasPrice = _header[field = 7].toInt<u256>();
gasLimit = _header[field = 8].toInt<u256>();
gasUsed = _header[field = 9].toInt<u256>();
timestamp = _header[field = 10].toInt<u256>();
extraData = _header[field = 11].toBytes();
nonce = _header[field = 12].toHash<h256>();
}
catch (Exception & _e)
{
_e << errinfo_name("invalid block header format") << BadFieldError(field, toHex(_header[field].data().toBytes()));
throw;
}
// check it hashes according to proof of work or that it's the genesis block.
if (_checkNonce && parentHash && !ProofOfWork::verify(headerHashWithoutNonce(), nonce, difficulty))
BOOST_THROW_EXCEPTION(InvalidBlockNonce(headerHashWithoutNonce(), nonce, difficulty));
if (gasUsed > gasLimit)
BOOST_THROW_EXCEPTION(TooMuchGasUsed());
if (number && extraData.size() > 1024)
BOOST_THROW_EXCEPTION(ExtraDataTooBig());
}
void BlockInfo::populate(bytesConstRef _block, bool _checkNonce)
{
RLP root(_block);
RLP header = root[0];
if (!header.isList())
BOOST_THROW_EXCEPTION(InvalidBlockFormat(0,header.data()));
populateFromHeader(header, _checkNonce);
if (!root[1].isList())
BOOST_THROW_EXCEPTION(InvalidBlockFormat(1, root[1].data()));
if (!root[2].isList())
BOOST_THROW_EXCEPTION(InvalidBlockFormat(2, root[2].data()));
}
void BlockInfo::verifyInternals(bytesConstRef _block) const
{
RLP root(_block);
u256 mgp = (u256)-1;
OverlayDB db;
GenericTrieDB<OverlayDB> t(&db);
t.init();
unsigned i = 0;
for (auto const& tr: root[1])
{
bytes k = rlp(i);
t.insert(&k, tr.data());
u256 gp = tr[0][1].toInt<u256>();
mgp = min(mgp, gp);
++i;
}
if (transactionsRoot != t.root())
BOOST_THROW_EXCEPTION(InvalidTransactionsHash(t.root(), transactionsRoot));
if (minGasPrice > mgp)
BOOST_THROW_EXCEPTION(InvalidMinGasPrice(minGasPrice, mgp));
if (sha3Uncles != sha3(root[2].data()))
BOOST_THROW_EXCEPTION(InvalidUnclesHash());
}
void BlockInfo::populateFromParent(BlockInfo const& _parent)
{
stateRoot = _parent.stateRoot;
parentHash = _parent.hash;
number = _parent.number + 1;
gasLimit = calculateGasLimit(_parent);
gasUsed = 0;
difficulty = calculateDifficulty(_parent);
}
u256 BlockInfo::calculateGasLimit(BlockInfo const& _parent) const
{
if (!parentHash)
return 1000000;
else
return max<u256>(125000, (_parent.gasLimit * (1024 - 1) + (_parent.gasUsed * 6 / 5)) / 1024);
}
u256 BlockInfo::calculateDifficulty(BlockInfo const& _parent) const
{
if (!parentHash)
return c_genesisDifficulty;
else
return timestamp >= _parent.timestamp + 5 ? _parent.difficulty - (_parent.difficulty >> 10) : (_parent.difficulty + (_parent.difficulty >> 10));
}
void BlockInfo::verifyParent(BlockInfo const& _parent) const
{
// Check difficulty is correct given the two timestamps.
if (difficulty != calculateDifficulty(_parent))
BOOST_THROW_EXCEPTION(InvalidDifficulty());
if (gasLimit != calculateGasLimit(_parent))
BOOST_THROW_EXCEPTION(InvalidGasLimit(gasLimit, calculateGasLimit(_parent)));
// Check timestamp is after previous timestamp.
if (parentHash)
{
if (parentHash != _parent.hash)
BOOST_THROW_EXCEPTION(InvalidParentHash());
if (timestamp < _parent.timestamp)
BOOST_THROW_EXCEPTION(InvalidTimestamp());
if (number != _parent.number + 1)
BOOST_THROW_EXCEPTION(InvalidNumber());
}
}
#endif