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265 lines
8.8 KiB
265 lines
8.8 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file BlockInfo.cpp
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#include <libdevcore/Common.h>
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#include <libdevcore/RLP.h>
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#include <libdevcrypto/TrieDB.h>
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#include <libethcore/Common.h>
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#include <libethcore/Params.h>
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#include "EthashAux.h"
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#include "ProofOfWork.h"
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#include "Exceptions.h"
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#include "BlockInfo.h"
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using namespace std;
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using namespace dev;
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using namespace dev::eth;
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BlockInfo::BlockInfo(): timestamp(Invalid256)
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{
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}
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BlockInfo::BlockInfo(bytesConstRef _block, Strictness _s, h256 const& _h)
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{
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populate(_block, _s, _h);
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}
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void BlockInfo::clear()
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{
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parentHash = h256();
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sha3Uncles = EmptyListSHA3;
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coinbaseAddress = Address();
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stateRoot = EmptyTrie;
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transactionsRoot = EmptyTrie;
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receiptsRoot = EmptyTrie;
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logBloom = LogBloom();
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difficulty = 0;
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number = 0;
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gasLimit = 0;
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gasUsed = 0;
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timestamp = 0;
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extraData.clear();
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mixHash = h256();
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nonce = Nonce();
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m_hash = m_seedHash = h256();
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}
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h256 const& BlockInfo::seedHash() const
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{
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if (!m_seedHash)
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m_seedHash = EthashAux::seedHash((unsigned)number);
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return m_seedHash;
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}
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h256 const& BlockInfo::hash() const
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{
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if (!m_hash)
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m_hash = headerHash(WithNonce);
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return m_hash;
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}
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h256 const& BlockInfo::boundary() const
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{
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if (!m_boundary && difficulty)
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m_boundary = (h256)(u256)((bigint(1) << 256) / difficulty);
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return m_boundary;
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}
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BlockInfo BlockInfo::fromHeader(bytesConstRef _header, Strictness _s, h256 const& _h)
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{
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BlockInfo ret;
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ret.populateFromHeader(RLP(_header), _s, _h);
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return ret;
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}
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h256 BlockInfo::headerHash(IncludeNonce _n) const
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{
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RLPStream s;
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streamRLP(s, _n);
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return sha3(s.out());
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}
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void BlockInfo::streamRLP(RLPStream& _s, IncludeNonce _n) const
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{
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_s.appendList(_n == WithNonce ? 15 : 13)
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<< parentHash << sha3Uncles << coinbaseAddress << stateRoot << transactionsRoot << receiptsRoot << logBloom
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<< difficulty << number << gasLimit << gasUsed << timestamp << extraData;
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if (_n == WithNonce)
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_s << mixHash << nonce;
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}
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h256 BlockInfo::headerHash(bytesConstRef _block)
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{
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return sha3(RLP(_block)[0].data());
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}
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void BlockInfo::populateFromHeader(RLP const& _header, Strictness _s, h256 const& _h)
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{
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m_hash = _h;
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if (_h)
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assert(_h == dev::sha3(_header.data()));
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m_seedHash = h256();
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int field = 0;
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try
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{
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if (_header.itemCount() != 15)
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throw InvalidBlockHeaderItemCount();
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parentHash = _header[field = 0].toHash<h256>(RLP::VeryStrict);
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sha3Uncles = _header[field = 1].toHash<h256>(RLP::VeryStrict);
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coinbaseAddress = _header[field = 2].toHash<Address>(RLP::VeryStrict);
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stateRoot = _header[field = 3].toHash<h256>(RLP::VeryStrict);
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transactionsRoot = _header[field = 4].toHash<h256>(RLP::VeryStrict);
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receiptsRoot = _header[field = 5].toHash<h256>(RLP::VeryStrict);
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logBloom = _header[field = 6].toHash<LogBloom>(RLP::VeryStrict);
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difficulty = _header[field = 7].toInt<u256>();
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number = _header[field = 8].toInt<u256>();
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gasLimit = _header[field = 9].toInt<u256>();
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gasUsed = _header[field = 10].toInt<u256>();
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timestamp = _header[field = 11].toInt<u256>();
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extraData = _header[field = 12].toBytes();
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mixHash = _header[field = 13].toHash<h256>(RLP::VeryStrict);
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nonce = _header[field = 14].toHash<Nonce>(RLP::VeryStrict);
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}
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catch (Exception const& _e)
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{
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_e << errinfo_name("invalid block header format") << BadFieldError(field, toHex(_header[field].data().toBytes()));
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throw;
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}
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if (number > ~(unsigned)0)
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throw InvalidNumber();
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// check it hashes according to proof of work or that it's the genesis block.
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if (_s == CheckEverything && parentHash && !ProofOfWork::verify(*this))
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BOOST_THROW_EXCEPTION(InvalidBlockNonce() << errinfo_hash256(headerHash(WithoutNonce)) << errinfo_nonce(nonce) << errinfo_difficulty(difficulty));
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else if (_s == QuickNonce && parentHash && !ProofOfWork::preVerify(*this))
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BOOST_THROW_EXCEPTION(InvalidBlockNonce() << errinfo_hash256(headerHash(WithoutNonce)) << errinfo_nonce(nonce) << errinfo_difficulty(difficulty));
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if (_s != CheckNothing)
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{
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if (gasUsed > gasLimit)
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BOOST_THROW_EXCEPTION(TooMuchGasUsed() << RequirementError(bigint(gasLimit), bigint(gasUsed)) );
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if (difficulty < c_minimumDifficulty)
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BOOST_THROW_EXCEPTION(InvalidDifficulty() << RequirementError(bigint(c_minimumDifficulty), bigint(difficulty)) );
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if (gasLimit < c_minGasLimit)
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BOOST_THROW_EXCEPTION(InvalidGasLimit() << RequirementError(bigint(c_minGasLimit), bigint(gasLimit)) );
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if (number && extraData.size() > c_maximumExtraDataSize)
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BOOST_THROW_EXCEPTION(ExtraDataTooBig() << RequirementError(bigint(c_maximumExtraDataSize), bigint(extraData.size())));
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}
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}
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void BlockInfo::populate(bytesConstRef _block, Strictness _s, h256 const& _h)
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{
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RLP root(_block);
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RLP header = root[0];
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if (!header.isList())
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BOOST_THROW_EXCEPTION(InvalidBlockFormat() << errinfo_comment("block header needs to be a list") << BadFieldError(0, header.data().toString()));
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populateFromHeader(header, _s, _h);
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if (!root[1].isList())
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BOOST_THROW_EXCEPTION(InvalidBlockFormat() << errinfo_comment("block transactions need to be a list") << BadFieldError(1, root[1].data().toString()));
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if (!root[2].isList())
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BOOST_THROW_EXCEPTION(InvalidBlockFormat() << errinfo_comment("block uncles need to be a list") << BadFieldError(2, root[2].data().toString()));
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}
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template <class T, class U> h256 trieRootOver(unsigned _itemCount, T const& _getKey, U const& _getValue)
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{
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MemoryDB db;
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GenericTrieDB<MemoryDB> t(&db);
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t.init();
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for (unsigned i = 0; i < _itemCount; ++i)
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t.insert(_getKey(i), _getValue(i));
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return t.root();
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}
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struct BlockInfoDiagnosticsChannel: public LogChannel { static const char* name() { return EthBlue "▧" EthWhite " ◌"; } static const int verbosity = 9; };
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void BlockInfo::verifyInternals(bytesConstRef _block) const
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{
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RLP root(_block);
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auto txList = root[1];
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auto expectedRoot = trieRootOver(txList.itemCount(), [&](unsigned i){ return rlp(i); }, [&](unsigned i){ return txList[i].data(); });
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clog(BlockInfoDiagnosticsChannel) << "Expected trie root:" << toString(expectedRoot);
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if (transactionsRoot != expectedRoot)
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BOOST_THROW_EXCEPTION(InvalidTransactionsHash() << HashMismatchError(expectedRoot, transactionsRoot));
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clog(BlockInfoDiagnosticsChannel) << "Expected uncle hash:" << toString(sha3(root[2].data()));
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if (sha3Uncles != sha3(root[2].data()))
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BOOST_THROW_EXCEPTION(InvalidUnclesHash());
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}
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void BlockInfo::populateFromParent(BlockInfo const& _parent)
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{
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noteDirty();
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stateRoot = _parent.stateRoot;
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parentHash = _parent.hash();
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number = _parent.number + 1;
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gasLimit = selectGasLimit(_parent);
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gasUsed = 0;
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difficulty = calculateDifficulty(_parent);
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}
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u256 BlockInfo::selectGasLimit(BlockInfo const& _parent) const
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{
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if (!parentHash)
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return c_genesisGasLimit;
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else
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// target minimum of 3141592
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return max<u256>(max<u256>(c_minGasLimit, 3141592), _parent.gasLimit - _parent.gasLimit / c_gasLimitBoundDivisor + 1 + (_parent.gasUsed * 6 / 5) / c_gasLimitBoundDivisor);
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}
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u256 BlockInfo::calculateDifficulty(BlockInfo const& _parent) const
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{
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if (!parentHash)
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return (u256)c_genesisDifficulty;
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else
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return max<u256>(c_minimumDifficulty, timestamp >= _parent.timestamp + c_durationLimit ? _parent.difficulty - (_parent.difficulty / c_difficultyBoundDivisor) : (_parent.difficulty + (_parent.difficulty / c_difficultyBoundDivisor)));
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}
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void BlockInfo::verifyParent(BlockInfo const& _parent) const
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{
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// Check difficulty is correct given the two timestamps.
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if (difficulty != calculateDifficulty(_parent))
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BOOST_THROW_EXCEPTION(InvalidDifficulty() << RequirementError((bigint)calculateDifficulty(_parent), (bigint)difficulty));
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if (gasLimit < c_minGasLimit ||
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gasLimit <= _parent.gasLimit - _parent.gasLimit / c_gasLimitBoundDivisor ||
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gasLimit >= _parent.gasLimit + _parent.gasLimit / c_gasLimitBoundDivisor)
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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));
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// Check timestamp is after previous timestamp.
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if (parentHash)
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{
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if (parentHash != _parent.hash())
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BOOST_THROW_EXCEPTION(InvalidParentHash());
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if (timestamp <= _parent.timestamp)
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BOOST_THROW_EXCEPTION(InvalidTimestamp());
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if (number != _parent.number + 1)
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BOOST_THROW_EXCEPTION(InvalidNumber());
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}
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}
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