tomFlowee
b4a3da2642
These are technically static libs, but not in any way shared libs. They are used solely only by this repo and really only by the hub. Most important, no header files are installed and basically none of the normal rules for reusable libraries are applied to these files.
95 lines
3.6 KiB
C++
95 lines
3.6 KiB
C++
/*
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* This file is part of the Flowee project
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* Copyright (c) 2009-2015 The Bitcoin Core developers
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*
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* This program 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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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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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 "main.h"
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#include "uint256.h"
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#include "BlocksDB.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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int GetTotalBlocksEstimate(const CCheckpointData& data)
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{
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const MapCheckpoints& checkpoints = data.mapCheckpoints;
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if (checkpoints.empty())
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return 0;
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return checkpoints.rbegin()->first;
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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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auto blockIndex = Blocks::Index::get(i.second);
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if (blockIndex)
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return blockIndex;
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}
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return NULL;
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}
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} // namespace Checkpoints
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