X-Git-Url: https://git.novaco.in/?a=blobdiff_plain;f=src%2Fkernel.cpp;h=ea2b43e91c0f879f1ef97c5d0818f22cdf9b7b6c;hb=4a6759691d71bf2a7d2a0a9e4710f0887e66ab02;hp=a7df10e58d989373fbceef86c0e04f7ff88e43e3;hpb=9417ff30cae6ffffd1c4fc4f4b1a81551f04dbc5;p=novacoin.git diff --git a/src/kernel.cpp b/src/kernel.cpp index a7df10e..ea2b43e 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; @@ -32,6 +36,8 @@ static std::map mapStakeModifierCheckpoints = (143990, 0x9c592c78u ) (149000, 0x48f2bdc4u ) (160000, 0x789df0f0u ) + (200000, 0x01ec1503u ) + (221047, 0x0b39ef50u ) ; // Hard checkpoints of stake modifiers to ensure they are deterministic (testNet) @@ -156,13 +162,13 @@ 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")) @@ -376,7 +382,7 @@ 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 @@ -422,113 +428,45 @@ 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) +// 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) { - // 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); -} + // TODO: custom threads amount -// Scan given midstate for solution -bool ScanMidstateForward(SHA256_CTX &ctx, uint32_t nBits, uint32_t nInputTxTime, int64_t nValueIn, std::pair &SearchInterval, std::pair &solution) -{ - CBigNum bnTargetPerCoinDay; - bnTargetPerCoinDay.SetCompact(nBits); + uint32_t nThreads = boost::thread::hardware_concurrency(); + uint32_t nPart = (SearchInterval.second - SearchInterval.first) / nThreads; - // 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; + KernelWorker *workers = new KernelWorker[nThreads]; - // Search forward in time from the given timestamp - // Stopping search in case of shutting down - for (uint32_t nTimeTx=SearchInterval.first; 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)) - { - solution.first = hashProofOfStake; - solution.second = nTimeTx; - - return true; - } + 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); } - return false; -} + group.join_all(); + solutions.clear(); -// 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--) + for(size_t i = 0; i < nThreads; i++) { - // 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; + std::vector > ws = workers[i].GetSolutions(); + solutions.insert(solutions.end(), ws.begin(), ws.end()); + } - if (bnTargetProofOfStake >= CBigNum(hashProofOfStake)) - { - solution.first = hashProofOfStake; - solution.second = nTimeTx; + delete [] workers; - return true; - } + if (solutions.size() == 0) + { + // no solutions + return false; } - return false; + return true; } // Check kernel hash target and coinstake signature