101 lines
3.7 KiB
C++
101 lines
3.7 KiB
C++
// Copyright (c) 2015 The Dogecoin 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 <boost/random/uniform_int.hpp>
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#include <boost/random/mersenne_twister.hpp>
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#include "arith_uint256.h"
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#include "dogecoin.h"
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#include "util.h"
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int static generateMTRandom(unsigned int s, int range)
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{
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boost::mt19937 gen(s);
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boost::uniform_int<> dist(1, range);
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return dist(gen);
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}
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unsigned int CalculateDogecoinNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params& params)
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{
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int nHeight = pindexLast->nHeight + 1;
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bool fNewDifficultyProtocol = (nHeight >= 145000);
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// bool fNewDifficultyProtocol = (nHeight >= params.GetDigiShieldForkBlock());
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const int64_t retargetTimespan = fNewDifficultyProtocol
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? 60 // params.DigiShieldTargetTimespan()
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: params.nPowTargetTimespan;
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const int64_t nActualTimespan = pindexLast->GetBlockTime() - nFirstBlockTime;
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int64_t nModulatedTimespan = nActualTimespan;
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int64_t nMaxTimespan;
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int64_t nMinTimespan;
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if (fNewDifficultyProtocol) //DigiShield implementation - thanks to RealSolid & WDC for this code
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{
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// amplitude filter - thanks to daft27 for this code
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nModulatedTimespan = retargetTimespan + (nModulatedTimespan - retargetTimespan) / 8;
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nMinTimespan = retargetTimespan - (retargetTimespan / 4);
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nMaxTimespan = retargetTimespan + (retargetTimespan / 2);
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} else if (nHeight > 10000) {
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nMinTimespan = retargetTimespan / 4;
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nMaxTimespan = retargetTimespan * 4;
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} else if (nHeight > 5000) {
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nMinTimespan = retargetTimespan / 8;
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nMaxTimespan = retargetTimespan * 4;
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} else {
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nMinTimespan = retargetTimespan / 16;
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nMaxTimespan = retargetTimespan * 4;
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}
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// Limit adjustment step
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if (nModulatedTimespan < nMinTimespan)
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nModulatedTimespan = nMinTimespan;
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else if (nModulatedTimespan > nMaxTimespan)
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nModulatedTimespan = nMaxTimespan;
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// Retarget
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const arith_uint256 bnPowLimit = UintToArith256(params.powLimit);
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arith_uint256 bnNew;
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arith_uint256 bnOld;
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bnNew.SetCompact(pindexLast->nBits);
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bnOld = bnNew;
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bnNew *= nModulatedTimespan;
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bnNew /= retargetTimespan;
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if (bnNew > bnPowLimit)
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bnNew = bnPowLimit;
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/// debug print
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LogPrintf("GetNextWorkRequired RETARGET\n");
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LogPrintf("params.nPowTargetTimespan = %d nActualTimespan = %d\n", params.nPowTargetTimespan, nActualTimespan);
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LogPrintf("Before: %08x %s\n", pindexLast->nBits, bnOld.ToString());
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LogPrintf("After: %08x %s\n", bnNew.GetCompact(), bnNew.ToString());
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return bnNew.GetCompact();
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}
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CAmount GetDogecoinBlockSubsidy(int nHeight, const Consensus::Params& consensusParams, uint256 prevHash)
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{
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int halvings = nHeight / consensusParams.nSubsidyHalvingInterval;
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if (nHeight < 145000) // && !consensusParams.SimplifiedRewards())
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{
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// Old-style rewards derived from the previous block hash
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const std::string cseed_str = prevHash.ToString().substr(7, 7);
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const char* cseed = cseed_str.c_str();
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char* endp = NULL;
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long seed = strtol(cseed, &endp, 16);
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CAmount maxReward = (1000000 >> halvings) - 1;
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int rand = generateMTRandom(seed, maxReward);
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return (1 + rand) * COIN;
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} else if (nHeight < (6 * consensusParams.nSubsidyHalvingInterval)) {
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// New-style constant rewards for each halving interval
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return (500000 * COIN) >> halvings;
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} else {
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// Constant inflation
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return 10000 * COIN;
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}
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}
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