X-Git-Url: https://git.novaco.in/?a=blobdiff_plain;f=src%2Fkernel.cpp;h=7d8a66ad268f33ca4128af258ccc0ca468548a41;hb=a042ef41f2db5ec89154d82b5522dfb5dcad40d5;hp=c9d3f49ffb49eac5a3f7b4ca838451aab54c0379;hpb=b0bd0ec4cb762e90e0f5525d4a78040e13d5a94b;p=novacoin.git diff --git a/src/kernel.cpp b/src/kernel.cpp index c9d3f49..7d8a66a 100644 --- a/src/kernel.cpp +++ b/src/kernel.cpp @@ -32,6 +32,7 @@ static std::map mapStakeModifierCheckpoints = (143990, 0x9c592c78u ) (149000, 0x48f2bdc4u ) (160000, 0x789df0f0u ) + (200000, 0x01ec1503u ) ; // Hard checkpoints of stake modifiers to ensure they are deterministic (testNet) @@ -94,18 +95,6 @@ bool IsFixedModifierInterval(unsigned int nTimeBlock) return (nTimeBlock >= (fTestNet? nModifierTestSwitchTime : nModifierSwitchTime)); } -// Get time weight -int64_t GetWeight(int64_t nIntervalBeginning, int64_t nIntervalEnd) -{ - // Kernel hash weight starts from 0 at the 30-day min age - // this change increases active coins participating the hash and helps - // to secure the network when proof-of-stake difficulty is low - // - // Maximum TimeWeight is 90 days. - - return min(nIntervalEnd - nIntervalBeginning - nStakeMinAge, (int64_t)nStakeMaxAge); -} - // Get the last stake modifier and its generation time from a given block static bool GetLastStakeModifier(const CBlockIndex* pindex, uint64_t& nStakeModifier, int64_t& nModifierTime) { @@ -410,10 +399,10 @@ bool CheckStakeKernelHash(uint32_t nBits, const CBlock& blockFrom, uint32_t nTxP DateTimeStrFormat(nStakeModifierTime).c_str(), mapBlockIndex[hashBlockFrom]->nHeight, DateTimeStrFormat(blockFrom.GetBlockTime()).c_str()); - printf("CheckStakeKernelHash() : check modifier=0x%016" PRIx64 " nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n", + printf("CheckStakeKernelHash() : check modifier=0x%016" PRIx64 " nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashTarget=%s hashProof=%s\n", nStakeModifier, nTimeBlockFrom, nTxPrevOffset, txPrev.nTime, prevout.n, nTimeTx, - hashProofOfStake.ToString().c_str()); + targetProofOfStake.ToString().c_str(), hashProofOfStake.ToString().c_str()); } // Now check if proof-of-stake hash meets target protocol @@ -426,83 +415,191 @@ bool CheckStakeKernelHash(uint32_t nBits, const CBlock& blockFrom, uint32_t nTxP DateTimeStrFormat(nStakeModifierTime).c_str(), mapBlockIndex[hashBlockFrom]->nHeight, DateTimeStrFormat(blockFrom.GetBlockTime()).c_str()); - printf("CheckStakeKernelHash() : pass modifier=0x%016" PRIx64 " nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashProof=%s\n", + printf("CheckStakeKernelHash() : pass modifier=0x%016" PRIx64 " nTimeBlockFrom=%u nTxPrevOffset=%u nTimeTxPrev=%u nPrevout=%u nTimeTx=%u hashTarget=%s hashProof=%s\n", nStakeModifier, nTimeBlockFrom, nTxPrevOffset, txPrev.nTime, prevout.n, nTimeTx, - hashProofOfStake.ToString().c_str()); + targetProofOfStake.ToString().c_str(), hashProofOfStake.ToString().c_str()); } return true; } -// Scan given coins set for kernel solution -bool ScanForStakeKernelHash(MetaMap &mapMeta, uint32_t nBits, uint32_t nTime, uint32_t nSearchInterval, CoinsSet::value_type &kernelcoin, uint32_t &nTimeTx, uint32_t &nBlockTime, uint64_t &nKernelsTried, uint64_t &nCoinDaysTried) +// 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) { - uint256 hashProofOfStake = 0; + // 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); +} - // (txid, vout.n) => ((txindex, (tx, vout.n)), (block, modifier)) - for(MetaMap::const_iterator meta_item = mapMeta.begin(); meta_item != mapMeta.end(); meta_item++) + +class ScanMidstateWorker +{ +public: + ScanMidstateWorker() + { } + ScanMidstateWorker(SHA256_CTX ctx, uint32_t nBits, uint32_t nInputTxTime, int64_t nValueIn, uint32_t nIntervalBegin, uint32_t nIntervalEnd) { - if (!fCoinsDataActual) - break; + workerSolutions = vector >(); + + workerCtx = ctx; + this->nBits = nBits; + this->nInputTxTime = nInputTxTime; + this->nValueIn = nValueIn; + this->nIntervalBegin = nIntervalBegin; + this->nIntervalEnd = nIntervalEnd; + } - CTxIndex txindex = (*meta_item).second.first.first; - CBlock block = (*meta_item).second.second.first; - uint64_t nStakeModifier = (*meta_item).second.second.second; + void Do() + { + CBigNum bnTargetPerCoinDay; + bnTargetPerCoinDay.SetCompact(nBits); - // Get coin - CoinsSet::value_type pcoin = meta_item->second.first.second; + // 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(); - static unsigned int nMaxStakeSearchInterval = 60; + SHA256_CTX ctx = workerCtx; - // only count coins meeting min age requirement - if (nStakeMinAge + block.nTime > nTime - nMaxStakeSearchInterval) - continue; + // Search forward in time from the given timestamp + // Stopping search in case of shutting down + for (uint32_t nTimeTx=nIntervalBegin; nTimeTxvout[pcoin.second].nValue; - // Search backward in time from the given timestamp - // Search nSearchInterval seconds back up to nMaxStakeSearchInterval - // Stopping search in case of shutting down or cache invalidation - for (unsigned int n=0; nnTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60); + // 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; - // Build kernel - CDataStream ss(SER_GETHASH, 0); - ss << nStakeModifier; - ss << nBlockTime << nTxOffset << pcoin.first->nTime << pcoin.second << nTimeTx; + if (bnTargetProofOfStake >= CBigNum(hashProofOfStake)) + { + workerSolutions.push_back(std::pair(hashProofOfStake, nTimeTx)); + } + } + } - // Calculate kernel hash - hashProofOfStake = Hash(ss.begin(), ss.end()); + vector > GetSolutions() + { + return workerSolutions; + } - // Update statistics - nKernelsTried += 1; - nCoinDaysTried += bnCoinDayWeight.getuint64(); +private: + SHA256_CTX workerCtx; + std::vector > workerSolutions; - if (bnTargetProofOfStake >= CBigNum(hashProofOfStake)) - { - if (fDebug) - printf("nStakeModifier=0x%016" PRIx64 ", nBlockTime=%u nTxOffset=%u nTxPrevTime=%u nVout=%u nTimeTx=%u hashProofOfStake=%s Success=true\n", - nStakeModifier, nBlockTime, nTxOffset, pcoin.first->nTime, pcoin.second, nTimeTx, hashProofOfStake.GetHex().c_str()); + uint32_t nBits; + uint32_t nInputTxTime; + int64_t nValueIn; + uint32_t nIntervalBegin; + uint32_t nIntervalEnd; +}; - kernelcoin = pcoin; - return true; - } +// 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) +{ + // TODO: custom threads amount - if (fDebug) - printf("nStakeModifier=0x%016" PRIx64 ", nBlockTime=%u nTxOffset=%u nTxPrevTime=%u nTxNumber=%u nTimeTx=%u hashProofOfStake=%s Success=false\n", - nStakeModifier, nBlockTime, nTxOffset, pcoin.first->nTime, pcoin.second, nTimeTx, hashProofOfStake.GetHex().c_str()); + uint32_t nThreads = boost::thread::hardware_concurrency(); + + uint32_t nBegin = SearchInterval.first; + uint32_t nEnd = SearchInterval.second; + uint32_t nPart = (nEnd - nBegin) / nThreads; + + ScanMidstateWorker *workers = new ScanMidstateWorker[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]); + group.create_thread(workerFnc); + } + + group.join_all(); + solutions.clear(); + + for(size_t i = 0; i < nThreads; i++) + { + std::vector > ws = workers[i].GetSolutions(); + solutions.insert(solutions.end(), ws.begin(), ws.end()); + } + + delete [] workers; + + if (solutions.size() == 0) + { + // no solutions + return false; + } + + 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; } } @@ -555,7 +652,7 @@ uint32_t GetStakeModifierChecksum(const CBlockIndex* pindex) ss << pindex->nFlags << pindex->hashProofOfStake << pindex->nStakeModifier; uint256 hashChecksum = Hash(ss.begin(), ss.end()); hashChecksum >>= (256 - 32); - return hashChecksum.Get64(); + return static_cast(hashChecksum.Get64()); } // Check stake modifier hard checkpoints