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84 lines
3.3 KiB
84 lines
3.3 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 BlockQueue.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 <boost/thread.hpp>
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#include <libdevcore/Common.h>
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#include <libdevcore/Log.h>
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#include <libethcore/CommonEth.h>
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#include <libdevcore/Guards.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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class BlockChain;
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struct BlockQueueChannel: public LogChannel { static const char* name() { return "[]Q"; } static const int verbosity = 4; };
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#define cblockq dev::LogOutputStream<dev::eth::BlockQueueChannel, true>()
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/**
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* @brief A queue of blocks. Sits between network or other I/O and the BlockChain.
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* Sorts them ready for blockchain insertion (with the BlockChain::sync() method).
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* @threadsafe
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*/
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class BlockQueue
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{
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public:
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/// Import a block into the queue.
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bool import(bytesConstRef _tx, BlockChain const& _bc);
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/// Notes that time has moved on and some blocks that used to be "in the future" may no be valid.
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void tick(BlockChain const& _bc);
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/// Grabs the blocks that are ready, giving them in the correct order for insertion into the chain.
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/// Don't forget to call doneDrain() once you're done importing.
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void drain(std::vector<bytes>& o_out);
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/// Must be called after a drain() call. Notes that the drained blocks have been imported into the blockchain, so we can forget about them.
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void doneDrain() { WriteGuard l(m_lock); m_drainingSet.clear(); }
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/// Notify the queue that the chain has changed and a new block has attained 'ready' status (i.e. is in the chain).
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void noteReady(h256 _b) { WriteGuard l(m_lock); noteReadyWithoutWriteGuard(_b); }
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/// Get information on the items queued.
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std::pair<unsigned, unsigned> items() const { ReadGuard l(m_lock); return std::make_pair(m_ready.size(), m_unknown.size()); }
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/// Clear everything.
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void clear() { WriteGuard l(m_lock); m_readySet.clear(); m_drainingSet.clear(); m_ready.clear(); m_unknownSet.clear(); m_unknown.clear(); m_future.clear(); }
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private:
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void noteReadyWithoutWriteGuard(h256 _b);
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void notePresentWithoutWriteGuard(bytesConstRef _block);
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mutable boost::shared_mutex m_lock; ///< General lock.
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std::set<h256> m_readySet; ///< All blocks ready for chain-import.
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std::set<h256> m_drainingSet; ///< All blocks being imported.
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std::vector<bytes> m_ready; ///< List of blocks, in correct order, ready for chain-import.
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std::set<h256> m_unknownSet; ///< Set of all blocks whose parents are not ready/in-chain.
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std::multimap<h256, std::pair<h256, bytes>> m_unknown; ///< For transactions that have an unknown parent; we map their parent hash to the block stuff, and insert once the block appears.
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std::multimap<unsigned, bytes> m_future; ///< Set of blocks that are not yet valid.
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};
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}
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}
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