checkpoints.cpp

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// Copyright (c) 2009-2014 The Bitcoin developers
// Copyright (c) 2014-2015 The Dash developers
// Copyright (c) 2015-2021 The PIVX Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include "checkpoints.h"
 
#include "chain.h"
#include "chainparams.h"
#include "reverse_iterate.h"
 
#include <stdint.h>
 
 
namespace Checkpoints
{
static const double SIGCHECK_VERIFICATION_FACTOR = 5.0;
 
bool fEnabled = true;
 
bool CheckBlock(int nHeight, const uint256& hash, bool fMatchesCheckpoint)
{
    if (!fEnabled)
        return true;
 
    const MapCheckpoints& checkpoints = *Params().Checkpoints().mapCheckpoints;
 
    MapCheckpoints::const_iterator i = checkpoints.find(nHeight);
    // If looking for an exact match, then return false
    if (i == checkpoints.end()) return !fMatchesCheckpoint;
    return hash == i->second;
}
 
double GuessVerificationProgress(const CBlockIndex* pindex, bool fSigchecks)
{
    if (pindex == nullptr)
        return 0.0;
 
    int64_t nNow = time(nullptr);
 
    double fSigcheckVerificationFactor = fSigchecks ? SIGCHECK_VERIFICATION_FACTOR : 1.0;
    double fWorkBefore = 0.0; // Amount of work done before pindex
    double fWorkAfter = 0.0;  // Amount of work left after pindex (estimated)
    // Work is defined as: 1.0 per transaction before the last checkpoint, and
    // fSigcheckVerificationFactor per transaction after.
 
    const CCheckpointData& data = Params().Checkpoints();
 
    if (pindex->nChainTx <= data.nTransactionsLastCheckpoint) {
        double nCheapBefore = pindex->nChainTx;
        double nCheapAfter = data.nTransactionsLastCheckpoint - pindex->nChainTx;
        double nExpensiveAfter = (nNow - data.nTimeLastCheckpoint) / 86400.0 * data.fTransactionsPerDay;
        fWorkBefore = nCheapBefore;
        fWorkAfter = nCheapAfter + nExpensiveAfter * fSigcheckVerificationFactor;
    } else {
        double nCheapBefore = data.nTransactionsLastCheckpoint;
        double nExpensiveBefore = pindex->nChainTx - data.nTransactionsLastCheckpoint;
        double nExpensiveAfter = (nNow - pindex->GetBlockTime()) / 86400.0 * data.fTransactionsPerDay;
        fWorkBefore = nCheapBefore + nExpensiveBefore * fSigcheckVerificationFactor;
        fWorkAfter = nExpensiveAfter * fSigcheckVerificationFactor;
    }
 
    return fWorkBefore / (fWorkBefore + fWorkAfter);
}
 
int GetTotalBlocksEstimate()
{
    if (!fEnabled)
        return 0;
 
    const MapCheckpoints& checkpoints = *Params().Checkpoints().mapCheckpoints;
 
    return checkpoints.rbegin()->first;
}
 
} // namespace Checkpoints