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128 lines
3.5 KiB
128 lines
3.5 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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Foobar 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 Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file BlockChain.h
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#pragma once
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#include "Common.h"
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namespace ldb = leveldb;
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namespace eth
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{
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struct Defaults
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{
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friend class BlockChain;
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friend class State;
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public:
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static void setDBPath(std::string _dbPath) { s_dbPath = _dbPath; }
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private:
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static std::string s_dbPath;
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};
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class RLP;
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class RLPStream;
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struct BlockDetails
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{
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BlockDetails(): number(0), totalDifficulty(0) {}
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BlockDetails(uint _n, u256 _tD, h256 _p, h256s _c): number(_n), totalDifficulty(_tD), parent(_p), children(_c) {}
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BlockDetails(RLP const& _r);
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bytes rlp() const;
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bool isNull() const { return !totalDifficulty; }
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explicit operator bool() const { return !isNull(); }
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uint number;
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u256 totalDifficulty;
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h256 parent;
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h256s children;
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};
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static const BlockDetails NullBlockDetails;
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static const h256s NullH256s;
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class Overlay;
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class AlreadyHaveBlock: public std::exception {};
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class UnknownParent: public std::exception {};
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/**
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* @brief Implements the blockchain database. All data this gives is disk-backed.
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*/
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class BlockChain
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{
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public:
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BlockChain(bool _killExisting = false): BlockChain(std::string(), _killExisting) {}
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BlockChain(std::string _path, bool _killExisting = false);
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~BlockChain();
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/// (Potentially) renders invalid existing bytesConstRef returned by lastBlock.
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/// To be called from main loop every 100ms or so.
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void process();
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/// Attempt to import the given block.
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bool attemptImport(bytes const& _block, Overlay const& _stateDB) { try { import(_block, _stateDB); return true; } catch (...) { return false; } }
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/// Import block into disk-backed DB
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void import(bytes const& _block, Overlay const& _stateDB);
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/// Get the number of the last block of the longest chain.
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BlockDetails const& details(h256 _hash) const;
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BlockDetails const& details() const { return details(currentHash()); }
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/// Get a given block (RLP format).
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bytesConstRef block(h256 _hash) const;
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bytesConstRef block() const { return block(currentHash()); }
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/// Get a given block (RLP format).
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h256 currentHash() const { return m_lastBlockHash; }
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/// Get the coinbase address of a given block.
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Address coinbaseAddress(h256 _hash) const;
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Address coinbaseAddress() const { return coinbaseAddress(currentHash()); }
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h256 genesisHash() const { return m_genesisHash; }
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private:
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void checkConsistency();
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/// Get fully populated from disk DB.
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mutable std::map<h256, BlockDetails> m_details;
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mutable std::map<h256, std::string> m_cache;
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ldb::DB* m_db;
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ldb::DB* m_detailsDB;
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/// Hash of the last (valid) block on the longest chain.
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h256 m_lastBlockHash;
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h256 m_genesisHash;
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bytes m_genesisBlock;
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ldb::ReadOptions m_readOptions;
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ldb::WriteOptions m_writeOptions;
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friend std::ostream& operator<<(std::ostream& _out, BlockChain const& _bc);
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};
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std::ostream& operator<<(std::ostream& _out, BlockChain const& _bc);
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}
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