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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
*/
#include <libdevcore/Common.h>
#include <libdevcore/RLP.h>
#include <libdevcrypto/TrieDB.h>
#include <libethcore/Common.h>
#include <libethcore/Params.h>
#include "EthashAux.h"
#include "ProofOfWork.h"
#include "Exceptions.h"
#include "BlockInfo.h"
using namespace std;
using namespace dev;
using namespace dev::eth;
BlockInfo::BlockInfo(): timestamp(Invalid256)
{
}
BlockInfo::BlockInfo(bytesConstRef _block, Strictness _s, h256 const& _h)
{
populate(_block, _s, _h);
}
void BlockInfo::clear()
{
parentHash = h256();
sha3Uncles = EmptyListSHA3;
coinbaseAddress = Address();
stateRoot = EmptyTrie;
transactionsRoot = EmptyTrie;
receiptsRoot = EmptyTrie;
logBloom = LogBloom();
difficulty = 0;
number = 0;
gasLimit = 0;
gasUsed = 0;
timestamp = 0;
extraData.clear();
mixHash = h256();
nonce = Nonce();
m_hash = m_seedHash = h256();
}
h256 const& BlockInfo::seedHash() const
{
if (!m_seedHash)
m_seedHash = EthashAux::seedHash((unsigned)number);
return m_seedHash;
}
h256 const& BlockInfo::hash() const
{
if (!m_hash)
m_hash = headerHash(WithNonce);
return m_hash;
}
h256 const& BlockInfo::boundary() const
{
if (!m_boundary && difficulty)
m_boundary = (h256)(u256)((bigint(1) << 256) / difficulty);
return m_boundary;
}
BlockInfo BlockInfo::fromHeader(bytesConstRef _header, Strictness _s, h256 const& _h)
{
BlockInfo ret;
ret.populateFromHeader(RLP(_header), _s, _h);
return ret;
}
h256 BlockInfo::headerHash(IncludeNonce _n) const
{
RLPStream s;
streamRLP(s, _n);
return sha3(s.out());
}
void BlockInfo::streamRLP(RLPStream& _s, IncludeNonce _n) const
{
_s.appendList(_n == WithNonce ? 15 : 13)
<< parentHash << sha3Uncles << coinbaseAddress << stateRoot << transactionsRoot << receiptsRoot << logBloom
<< difficulty << number << gasLimit << gasUsed << timestamp << extraData;
if (_n == WithNonce)
_s << mixHash << nonce;
}
h256 BlockInfo::headerHash(bytesConstRef _block)
{
return sha3(RLP(_block)[0].data());
}
void BlockInfo::populateFromHeader(RLP const& _header, Strictness _s, h256 const& _h)
{
m_hash = _h;
if (_h)
assert(_h == dev::sha3(_header.data()));
m_seedHash = h256();
int field = 0;
try
{
if (_header.itemCount() != 15)
throw InvalidBlockHeaderItemCount();
parentHash = _header[field = 0].toHash<h256>(RLP::VeryStrict);
sha3Uncles = _header[field = 1].toHash<h256>(RLP::VeryStrict);
coinbaseAddress = _header[field = 2].toHash<Address>(RLP::VeryStrict);
stateRoot = _header[field = 3].toHash<h256>(RLP::VeryStrict);
transactionsRoot = _header[field = 4].toHash<h256>(RLP::VeryStrict);
receiptsRoot = _header[field = 5].toHash<h256>(RLP::VeryStrict);
logBloom = _header[field = 6].toHash<LogBloom>(RLP::VeryStrict);
difficulty = _header[field = 7].toInt<u256>();
number = _header[field = 8].toInt<u256>();
gasLimit = _header[field = 9].toInt<u256>();
gasUsed = _header[field = 10].toInt<u256>();
timestamp = _header[field = 11].toInt<u256>();
extraData = _header[field = 12].toBytes();
mixHash = _header[field = 13].toHash<h256>(RLP::VeryStrict);
nonce = _header[field = 14].toHash<Nonce>(RLP::VeryStrict);
}
catch (Exception const& _e)
{
_e << errinfo_name("invalid block header format") << BadFieldError(field, toHex(_header[field].data().toBytes()));
throw;
}
if (number > ~(unsigned)0)
throw InvalidNumber();
// check it hashes according to proof of work or that it's the genesis block.
if (_s == CheckEverything && parentHash && !ProofOfWork::verify(*this))
BOOST_THROW_EXCEPTION(InvalidBlockNonce() << errinfo_hash256(headerHash(WithoutNonce)) << errinfo_nonce(nonce) << errinfo_difficulty(difficulty));
else if (_s == QuickNonce && parentHash && !ProofOfWork::preVerify(*this))
BOOST_THROW_EXCEPTION(InvalidBlockNonce() << errinfo_hash256(headerHash(WithoutNonce)) << errinfo_nonce(nonce) << errinfo_difficulty(difficulty));
if (_s != CheckNothing)
{
if (gasUsed > gasLimit)
BOOST_THROW_EXCEPTION(TooMuchGasUsed() << RequirementError(bigint(gasLimit), bigint(gasUsed)) );
if (difficulty < c_minimumDifficulty)
BOOST_THROW_EXCEPTION(InvalidDifficulty() << RequirementError(bigint(c_minimumDifficulty), bigint(difficulty)) );
if (gasLimit < c_minGasLimit)
BOOST_THROW_EXCEPTION(InvalidGasLimit() << RequirementError(bigint(c_minGasLimit), bigint(gasLimit)) );
if (number && extraData.size() > c_maximumExtraDataSize)
BOOST_THROW_EXCEPTION(ExtraDataTooBig() << RequirementError(bigint(c_maximumExtraDataSize), bigint(extraData.size())));
}
}
void BlockInfo::populate(bytesConstRef _block, Strictness _s, h256 const& _h)
{
RLP root(_block);
RLP header = root[0];
if (!header.isList())
BOOST_THROW_EXCEPTION(InvalidBlockFormat() << errinfo_comment("block header needs to be a list") << BadFieldError(0, header.data().toString()));
populateFromHeader(header, _s, _h);
if (!root[1].isList())
BOOST_THROW_EXCEPTION(InvalidBlockFormat() << errinfo_comment("block transactions need to be a list") << BadFieldError(1, root[1].data().toString()));
if (!root[2].isList())
BOOST_THROW_EXCEPTION(InvalidBlockFormat() << errinfo_comment("block uncles need to be a list") << BadFieldError(2, root[2].data().toString()));
}
template <class T, class U> h256 trieRootOver(unsigned _itemCount, T const& _getKey, U const& _getValue)
{
MemoryDB db;
GenericTrieDB<MemoryDB> t(&db);
t.init();
for (unsigned i = 0; i < _itemCount; ++i)
t.insert(_getKey(i), _getValue(i));
return t.root();
}
struct BlockInfoDiagnosticsChannel: public LogChannel { static const char* name() { return EthBlue "" EthWhite ""; } static const int verbosity = 9; };
void BlockInfo::verifyInternals(bytesConstRef _block) const
{
RLP root(_block);
auto txList = root[1];
auto expectedRoot = trieRootOver(txList.itemCount(), [&](unsigned i){ return rlp(i); }, [&](unsigned i){ return txList[i].data(); });
clog(BlockInfoDiagnosticsChannel) << "Expected trie root:" << toString(expectedRoot);
if (transactionsRoot != expectedRoot)
BOOST_THROW_EXCEPTION(InvalidTransactionsHash() << HashMismatchError(expectedRoot, transactionsRoot));
clog(BlockInfoDiagnosticsChannel) << "Expected uncle hash:" << toString(sha3(root[2].data()));
if (sha3Uncles != sha3(root[2].data()))
BOOST_THROW_EXCEPTION(InvalidUnclesHash());
}
void BlockInfo::populateFromParent(BlockInfo const& _parent)
{
noteDirty();
stateRoot = _parent.stateRoot;
parentHash = _parent.hash();
number = _parent.number + 1;
gasLimit = selectGasLimit(_parent);
gasUsed = 0;
difficulty = calculateDifficulty(_parent);
}
u256 BlockInfo::selectGasLimit(BlockInfo const& _parent) const
{
if (!parentHash)
return c_genesisGasLimit;
else
// target minimum of 3141592
return max<u256>(max<u256>(c_minGasLimit, 3141592), _parent.gasLimit - _parent.gasLimit / c_gasLimitBoundDivisor + 1 + (_parent.gasUsed * 6 / 5) / c_gasLimitBoundDivisor);
}
u256 BlockInfo::calculateDifficulty(BlockInfo const& _parent) const
{
if (!parentHash)
return (u256)c_genesisDifficulty;
else
return max<u256>(c_minimumDifficulty, timestamp >= _parent.timestamp + c_durationLimit ? _parent.difficulty - (_parent.difficulty / c_difficultyBoundDivisor) : (_parent.difficulty + (_parent.difficulty / c_difficultyBoundDivisor)));
}
void BlockInfo::verifyParent(BlockInfo const& _parent) const
{
// Check difficulty is correct given the two timestamps.
if (difficulty != calculateDifficulty(_parent))
BOOST_THROW_EXCEPTION(InvalidDifficulty() << RequirementError((bigint)calculateDifficulty(_parent), (bigint)difficulty));
if (gasLimit < c_minGasLimit ||
gasLimit <= _parent.gasLimit - _parent.gasLimit / c_gasLimitBoundDivisor ||
gasLimit >= _parent.gasLimit + _parent.gasLimit / c_gasLimitBoundDivisor)
BOOST_THROW_EXCEPTION(InvalidGasLimit() << errinfo_min((bigint)_parent.gasLimit - _parent.gasLimit / c_gasLimitBoundDivisor) << errinfo_got((bigint)gasLimit) << errinfo_max((bigint)_parent.gasLimit + _parent.gasLimit / c_gasLimitBoundDivisor));
// 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());
}
}