73 lines
2.9 KiB
C++
73 lines
2.9 KiB
C++
// Copyright (c) 2009-2016 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include "checkpoints.h"
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#include "chain.h"
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#include "chainparams.h"
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#include "validation.h"
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#include "uint256.h"
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#include <stdint.h>
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#include <boost/foreach.hpp>
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namespace Checkpoints {
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/**
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* How many times slower we expect checking transactions after the last
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* checkpoint to be (from checking signatures, which is skipped up to the
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* last checkpoint). This number is a compromise, as it can't be accurate
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* for every system. When reindexing from a fast disk with a slow CPU, it
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* can be up to 20, while when downloading from a slow network with a
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* fast multicore CPU, it won't be much higher than 1.
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*/
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static const double SIGCHECK_VERIFICATION_FACTOR = 5.0;
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//! Guess how far we are in the verification process at the given block index
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double GuessVerificationProgress(const CCheckpointData& data, CBlockIndex *pindex, bool fSigchecks) {
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if (pindex==NULL)
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return 0.0;
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int64_t nNow = time(NULL);
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double fSigcheckVerificationFactor = fSigchecks ? SIGCHECK_VERIFICATION_FACTOR : 1.0;
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double fWorkBefore = 0.0; // Amount of work done before pindex
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double fWorkAfter = 0.0; // Amount of work left after pindex (estimated)
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// Work is defined as: 1.0 per transaction before the last checkpoint, and
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// fSigcheckVerificationFactor per transaction after.
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if (pindex->nChainTx <= data.nTransactionsLastCheckpoint) {
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double nCheapBefore = pindex->nChainTx;
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double nCheapAfter = data.nTransactionsLastCheckpoint - pindex->nChainTx;
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double nExpensiveAfter = (nNow - data.nTimeLastCheckpoint)/86400.0*data.fTransactionsPerDay;
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fWorkBefore = nCheapBefore;
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fWorkAfter = nCheapAfter + nExpensiveAfter*fSigcheckVerificationFactor;
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} else {
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double nCheapBefore = data.nTransactionsLastCheckpoint;
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double nExpensiveBefore = pindex->nChainTx - data.nTransactionsLastCheckpoint;
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double nExpensiveAfter = (nNow - pindex->GetBlockTime())/86400.0*data.fTransactionsPerDay;
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fWorkBefore = nCheapBefore + nExpensiveBefore*fSigcheckVerificationFactor;
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fWorkAfter = nExpensiveAfter*fSigcheckVerificationFactor;
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}
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return fWorkBefore / (fWorkBefore + fWorkAfter);
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}
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CBlockIndex* GetLastCheckpoint(const CCheckpointData& data)
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{
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const MapCheckpoints& checkpoints = data.mapCheckpoints;
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BOOST_REVERSE_FOREACH(const MapCheckpoints::value_type& i, checkpoints)
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{
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const uint256& hash = i.second;
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BlockMap::const_iterator t = mapBlockIndex.find(hash);
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if (t != mapBlockIndex.end())
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return t->second;
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}
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return NULL;
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}
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} // namespace Checkpoints
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