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111 lines
3.6 KiB
111 lines
3.6 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 EthashAux.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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#pragma once
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#include <condition_variable>
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#include <libethash/ethash.h>
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#include <libdevcore/Worker.h>
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#include "Ethash.h"
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namespace dev
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{
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namespace eth
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{
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struct DAGChannel: public LogChannel { static const char* name(); static const int verbosity = 1; };
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class EthashAux
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{
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public:
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~EthashAux();
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static EthashAux* get() { if (!s_this) s_this = new EthashAux(); return s_this; }
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struct LightAllocation
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{
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LightAllocation(h256 const& _seedHash);
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~LightAllocation();
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bytesConstRef data() const;
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Ethash::Result compute(h256 const& _headerHash, Nonce const& _nonce) const;
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ethash_light_t light;
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uint64_t size;
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};
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struct FullAllocation
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{
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FullAllocation(ethash_light_t _light, ethash_callback_t _cb);
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~FullAllocation();
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Ethash::Result compute(h256 const& _headerHash, Nonce const& _nonce) const;
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bytesConstRef data() const;
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uint64_t size() const { return ethash_full_dag_size(full); }
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ethash_full_t full;
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};
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using LightType = std::shared_ptr<LightAllocation>;
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using FullType = std::shared_ptr<FullAllocation>;
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static h256 seedHash(unsigned _number);
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static uint64_t number(h256 const& _seedHash);
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static uint64_t cacheSize(BlockInfo const& _header);
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static uint64_t dataSize(uint64_t _blockNumber);
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static LightType light(h256 const& _seedHash);
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static const uint64_t NotGenerating = (uint64_t)-1;
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/// Kicks off generation of DAG for @a _seedHash and @returns false or @returns true if ready.
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static unsigned computeFull(h256 const& _seedHash, bool _createIfMissing = true);
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/// Information on the generation progress.
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static std::pair<uint64_t, unsigned> fullGeneratingProgress() { return std::make_pair(get()->m_generatingFullNumber, get()->m_fullProgress); }
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/// Kicks off generation of DAG for @a _blocknumber and blocks until ready; @returns result or empty pointer if not existing and _createIfMissing is false.
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static FullType full(h256 const& _seedHash, bool _createIfMissing = false, std::function<int(unsigned)> const& _f = std::function<int(unsigned)>());
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static Ethash::Result eval(BlockInfo const& _header) { return eval(_header, _header.nonce); }
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static Ethash::Result eval(BlockInfo const& _header, Nonce const& _nonce);
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static Ethash::Result eval(h256 const& _seedHash, h256 const& _headerHash, Nonce const& _nonce);
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private:
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EthashAux() {}
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/// Kicks off generation of DAG for @a _blocknumber and blocks until ready; @returns result.
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void killCache(h256 const& _s);
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static EthashAux* s_this;
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SharedMutex x_lights;
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std::unordered_map<h256, std::shared_ptr<LightAllocation>> m_lights;
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Mutex x_fulls;
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std::condition_variable m_fullsChanged;
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std::unordered_map<h256, std::weak_ptr<FullAllocation>> m_fulls;
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FullType m_lastUsedFull;
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std::unique_ptr<std::thread> m_fullGenerator;
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uint64_t m_generatingFullNumber = NotGenerating;
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unsigned m_fullProgress;
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Mutex x_epochs;
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std::unordered_map<h256, unsigned> m_epochs;
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h256s m_seedHashes;
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};
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}
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}
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