X-Git-Url: https://git.novaco.in/?p=novacoin.git;a=blobdiff_plain;f=src%2Fkernel.cpp;h=b18ae2b7c180f836f687b46f019c134ba17cd513;hp=7d8a66ad268f33ca4128af258ccc0ca468548a41;hb=89d4073d0a6545330af16bb8b2352881b6f55cf5;hpb=a042ef41f2db5ec89154d82b5522dfb5dcad40d5 diff --git a/src/kernel.cpp b/src/kernel.cpp index 7d8a66a..b18ae2b 100644 --- a/src/kernel.cpp +++ b/src/kernel.cpp @@ -1,10 +1,14 @@ // Copyright (c) 2012-2013 The PPCoin developers +// Copyright (c) 2013-2015 The Novacoin developers +// Distributed under the MIT/X11 software license, see the accompanying +// file COPYING or http://www.opensource.org/licenses/mit-license.php. // Distributed under the MIT/X11 software license, see the accompanying // file COPYING or http://www.opensource.org/licenses/mit-license.php. #include #include "kernel.h" +#include "kernel_worker.h" #include "txdb.h" extern unsigned int nStakeMaxAge; @@ -33,6 +37,8 @@ static std::map mapStakeModifierCheckpoints = (149000, 0x48f2bdc4u ) (160000, 0x789df0f0u ) (200000, 0x01ec1503u ) + (221047, 0x0b39ef50u ) + (243100, 0xe928d83au ) ; // Hard checkpoints of stake modifiers to ensure they are deterministic (testNet) @@ -157,13 +163,13 @@ static bool SelectBlockFromCandidates(vector >& vSortedBy if (fSelected && hashSelection < hashBest) { hashBest = hashSelection; - *pindexSelected = (const CBlockIndex*) pindex; + *pindexSelected = pindex; } else if (!fSelected) { fSelected = true; hashBest = hashSelection; - *pindexSelected = (const CBlockIndex*) pindex; + *pindexSelected = pindex; } } if (fDebug && GetBoolArg("-printstakemodifier")) @@ -377,7 +383,7 @@ bool CheckStakeKernelHash(uint32_t nBits, const CBlock& blockFrom, uint32_t nTxP uint256 hashBlockFrom = blockFrom.GetHash(); - CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)txPrev.nTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60); + CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)txPrev.nTime, (int64_t)nTimeTx) / COIN / nOneDay; targetProofOfStake = (bnCoinDayWeight * bnTargetPerCoinDay).getuint256(); // Calculate hash @@ -423,119 +429,28 @@ bool CheckStakeKernelHash(uint32_t nBits, const CBlock& blockFrom, uint32_t nTxP return true; } -// Precompute hashing state for static part of kernel -void GetKernelMidstate(uint64_t nStakeModifier, uint32_t nBlockTime, uint32_t nTxOffset, uint32_t nInputTxTime, uint32_t nOut, SHA256_CTX &ctx) -{ - // Build static part of kernel - CDataStream ssKernel(SER_GETHASH, 0); - ssKernel << nStakeModifier; - ssKernel << nBlockTime << nTxOffset << nInputTxTime << nOut; - CDataStream::const_iterator it = ssKernel.begin(); - - // Init sha256 context and update it - // with first 24 bytes of kernel - SHA256_Init(&ctx); - SHA256_Update(&ctx, (unsigned char*)&it[0], 8 + 16); -} - - -class ScanMidstateWorker -{ -public: - ScanMidstateWorker() - { } - ScanMidstateWorker(SHA256_CTX ctx, uint32_t nBits, uint32_t nInputTxTime, int64_t nValueIn, uint32_t nIntervalBegin, uint32_t nIntervalEnd) - { - workerSolutions = vector >(); - - workerCtx = ctx; - this->nBits = nBits; - this->nInputTxTime = nInputTxTime; - this->nValueIn = nValueIn; - this->nIntervalBegin = nIntervalBegin; - this->nIntervalEnd = nIntervalEnd; - } - - void Do() - { - CBigNum bnTargetPerCoinDay; - bnTargetPerCoinDay.SetCompact(nBits); - - // Get maximum possible target to filter out the majority of obviously insufficient hashes - CBigNum bnMaxTargetPerCoinDay = bnTargetPerCoinDay * CBigNum(nValueIn) * nStakeMaxAge / COIN / (24 * 60 * 60); - uint256 maxTarget = bnMaxTargetPerCoinDay.getuint256(); - - SHA256_CTX ctx = workerCtx; - - // Search forward in time from the given timestamp - // Stopping search in case of shutting down - for (uint32_t nTimeTx=nIntervalBegin; nTimeTx maxTarget) - continue; - - CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)nInputTxTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60); - CBigNum bnTargetProofOfStake = bnCoinDayWeight * bnTargetPerCoinDay; - - if (bnTargetProofOfStake >= CBigNum(hashProofOfStake)) - { - workerSolutions.push_back(std::pair(hashProofOfStake, nTimeTx)); - } - } - } - - vector > GetSolutions() - { - return workerSolutions; - } - -private: - SHA256_CTX workerCtx; - std::vector > workerSolutions; - - uint32_t nBits; - uint32_t nInputTxTime; - int64_t nValueIn; - uint32_t nIntervalBegin; - uint32_t nIntervalEnd; -}; - -// Scan given midstate for solution -bool ScanMidstateForward(SHA256_CTX &ctx, uint32_t nBits, uint32_t nInputTxTime, int64_t nValueIn, std::pair &SearchInterval, std::vector > &solutions) +// Scan given kernel for solution +bool ScanKernelForward(unsigned char *kernel, uint32_t nBits, uint32_t nInputTxTime, int64_t nValueIn, std::pair &SearchInterval, std::vector > &solutions) { // TODO: custom threads amount uint32_t nThreads = boost::thread::hardware_concurrency(); + if (nThreads == 0) + { + nThreads = 1; + printf("Warning: hardware_concurrency() failed in %s:%d\n", __FILE__, __LINE__); + } + uint32_t nPart = (SearchInterval.second - SearchInterval.first) / nThreads; - uint32_t nBegin = SearchInterval.first; - uint32_t nEnd = SearchInterval.second; - uint32_t nPart = (nEnd - nBegin) / nThreads; - - ScanMidstateWorker *workers = new ScanMidstateWorker[nThreads]; + KernelWorker *workers = new KernelWorker[nThreads]; boost::thread_group group; for(size_t i = 0; i < nThreads; i++) { - uint32_t nIntervalBegin = nBegin + nPart * i; - uint32_t nIntervalEnd = nBegin + nPart * (i + 1); - - workers[i] = ScanMidstateWorker(ctx, nBits, nInputTxTime, nValueIn, nIntervalBegin, nIntervalEnd); - - boost::function workerFnc = boost::bind(&ScanMidstateWorker::Do, &workers[i]); + uint32_t nBegin = SearchInterval.first + nPart * i; + uint32_t nEnd = SearchInterval.first + nPart * (i + 1); + workers[i] = KernelWorker(kernel, nBits, nInputTxTime, nValueIn, nBegin, nEnd); + boost::function workerFnc = boost::bind(&KernelWorker::Do, &workers[i]); group.create_thread(workerFnc); } @@ -559,53 +474,6 @@ bool ScanMidstateForward(SHA256_CTX &ctx, uint32_t nBits, uint32_t nInputTxTime, return true; } -// Scan given midstate for solution -bool ScanMidstateBackward(SHA256_CTX &ctx, uint32_t nBits, uint32_t nInputTxTime, int64_t nValueIn, std::pair &SearchInterval, std::pair &solution) -{ - CBigNum bnTargetPerCoinDay; - bnTargetPerCoinDay.SetCompact(nBits); - - // Get maximum possible target to filter out the majority of obviously insufficient hashes - CBigNum bnMaxTargetPerCoinDay = bnTargetPerCoinDay * CBigNum(nValueIn) * nStakeMaxAge / COIN / (24 * 60 * 60); - uint256 maxTarget = bnMaxTargetPerCoinDay.getuint256(); - - SHA256_CTX ctxCopy = ctx; - - // Search backward in time from the given timestamp - // Stopping search in case of shutting down - for (uint32_t nTimeTx=SearchInterval.first; nTimeTx>SearchInterval.second && !fShutdown; nTimeTx--) - { - // Complete first hashing iteration - uint256 hash1; - SHA256_Update(&ctxCopy, (unsigned char*)&nTimeTx, 4); - SHA256_Final((unsigned char*)&hash1, &ctxCopy); - - // Restore context - ctxCopy = ctx; - - // Finally, calculate kernel hash - uint256 hashProofOfStake; - SHA256((unsigned char*)&hash1, sizeof(hashProofOfStake), (unsigned char*)&hashProofOfStake); - - // Skip if hash doesn't satisfy the maximum target - if (hashProofOfStake > maxTarget) - continue; - - CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)nInputTxTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60); - CBigNum bnTargetProofOfStake = bnCoinDayWeight * bnTargetPerCoinDay; - - if (bnTargetProofOfStake >= CBigNum(hashProofOfStake)) - { - solution.first = hashProofOfStake; - solution.second = nTimeTx; - - return true; - } - } - - return false; -} - // Check kernel hash target and coinstake signature bool CheckProofOfStake(const CTransaction& tx, unsigned int nBits, uint256& hashProofOfStake, uint256& targetProofOfStake) {