// 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 <boost/assign/list_of.hpp>
#include "kernel.h"
+#include "kernel_worker.h"
#include "txdb.h"
extern unsigned int nStakeMaxAge;
static std::map<int, unsigned int> mapStakeModifierCheckpoints =
boost::assign::map_list_of
( 0, 0x0e00670bu )
- ( 9690, 0x97dcdafau )
( 12661, 0x5d84115du )
- ( 37092, 0xd230afccu )
- ( 44200, 0x05370164u )
- ( 65000, 0xc8e7be6au )
- ( 68600, 0x73a8cc4cu )
- ( 92161, 0xe21a911au )
- ( 98661, 0xd20c44d4u )
(143990, 0x9c592c78u )
+ (149000, 0x48f2bdc4u )
+ (160000, 0x789df0f0u )
+ (200000, 0x01ec1503u )
+ (221047, 0x0b39ef50u )
+ (243100, 0xe928d83au )
;
// Hard checkpoints of stake modifiers to ensure they are deterministic (testNet)
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)
{
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"))
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
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
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, KernelSearchSettings &settings, CoinsSet::value_type &kernelcoin, uint32_t &nTimeTx, uint32_t &nBlockTime, uint64_t &nKernelsTried, uint64_t &nCoinDaysTried)
+// Scan given kernel for solution
+bool ScanKernelForward(unsigned char *kernel, uint32_t nBits, uint32_t nInputTxTime, int64_t nValueIn, std::pair<uint32_t, uint32_t> &SearchInterval, std::vector<std::pair<uint256, uint32_t> > &solutions)
{
- uint256 hashProofOfStake = 0;
+ // TODO: custom threads amount
- // (txid, vout.n) => ((txindex, (tx, vout.n)), (block, modifier))
- for(MetaMap::const_iterator meta_item = mapMeta.begin(); meta_item != mapMeta.end(); meta_item++)
+ uint32_t nThreads = boost::thread::hardware_concurrency();
+ if (nThreads == 0)
{
- if (!fCoinsDataActual)
- break;
-
- CTxIndex txindex = (*meta_item).second.first.first;
- CBlock block = (*meta_item).second.second.first;
- uint64_t nStakeModifier = (*meta_item).second.second.second;
-
- // Get coin
- CoinsSet::value_type pcoin = meta_item->second.first.second;
-
- static int nMaxStakeSearchInterval = 60;
-
- // only count coins meeting min age requirement
- if (nStakeMinAge + block.nTime > settings.nTime - nMaxStakeSearchInterval)
- continue;
-
- // Transaction offset inside block
- uint32_t nTxOffset = txindex.pos.nTxPos - txindex.pos.nBlockPos;
-
- // Current timestamp scanning interval
- unsigned int nCurrentSearchInterval = min((int64_t)settings.nSearchInterval, (int64_t)nMaxStakeSearchInterval);
-
- nBlockTime = block.nTime;
- CBigNum bnTargetPerCoinDay;
- bnTargetPerCoinDay.SetCompact(settings.nBits);
- int64_t nValueIn = pcoin.first->vout[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; n<nCurrentSearchInterval && fCoinsDataActual && !fShutdown; n++)
- {
- nTimeTx = settings.nTime - n;
- CBigNum bnCoinDayWeight = CBigNum(nValueIn) * GetWeight((int64_t)pcoin.first->nTime, (int64_t)nTimeTx) / COIN / (24 * 60 * 60);
- CBigNum bnTargetProofOfStake = bnCoinDayWeight * bnTargetPerCoinDay;
+ nThreads = 1;
+ printf("Warning: hardware_concurrency() failed in %s:%d\n", __FILE__, __LINE__);
+ }
+ uint32_t nPart = (SearchInterval.second - SearchInterval.first) / nThreads;
- // Build kernel
- CDataStream ss(SER_GETHASH, 0);
- ss << nStakeModifier;
- ss << nBlockTime << nTxOffset << pcoin.first->nTime << pcoin.second << nTimeTx;
+ KernelWorker *workers = new KernelWorker[nThreads];
- // Calculate kernel hash
- hashProofOfStake = Hash(ss.begin(), ss.end());
+ boost::thread_group group;
+ for(size_t i = 0; i < nThreads; 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<void()> workerFnc = boost::bind(&KernelWorker::Do, &workers[i]);
+ group.create_thread(workerFnc);
+ }
- // Update statistics
- nKernelsTried += 1;
- nCoinDaysTried += bnCoinDayWeight.getuint64();
+ group.join_all();
+ solutions.clear();
- 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());
+ for(size_t i = 0; i < nThreads; i++)
+ {
+ std::vector<std::pair<uint256, uint32_t> > ws = workers[i].GetSolutions();
+ solutions.insert(solutions.end(), ws.begin(), ws.end());
+ }
- kernelcoin = pcoin;
- return true;
- }
+ delete [] workers;
- 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());
- }
+ if (solutions.size() == 0)
+ {
+ // no solutions
+ return false;
}
- return false;
+ return true;
}
// Check kernel hash target and coinstake signature
ss << pindex->nFlags << pindex->hashProofOfStake << pindex->nStakeModifier;
uint256 hashChecksum = Hash(ss.begin(), ss.end());
hashChecksum >>= (256 - 32);
- return hashChecksum.Get64();
+ return static_cast<uint32_t>(hashChecksum.Get64());
}
// Check stake modifier hard checkpoints
git://git.novaco.in / novacoin.git / blobdiff