// BitcoinMiner
//
-extern unsigned int nMinerSleep;
+int64_t nReserveBalance = 0;
+static unsigned int nMaxStakeSearchInterval = 60;
int static FormatHashBlocks(void* pbuffer, unsigned int len)
{
}
};
-// CreateNewBlock: create new block (without proof-of-work/proof-of-stake)
-CBlock* CreateNewBlock(CWallet* pwallet, bool fProofOfStake)
+// CreateNewBlock: create new block (without proof-of-work/with provided coinstake)
+CBlock* CreateNewBlock(CWallet* pwallet, CTransaction *txCoinStake)
{
+ bool fProofOfStake = txCoinStake != NULL;
+
// Create new block
auto_ptr<CBlock> pblock(new CBlock());
if (!pblock.get())
return NULL;
// Create coinbase tx
- CTransaction txNew;
- txNew.vin.resize(1);
- txNew.vin[0].prevout.SetNull();
- txNew.vout.resize(1);
+ CTransaction txCoinBase;
+ txCoinBase.vin.resize(1);
+ txCoinBase.vin[0].prevout.SetNull();
+ txCoinBase.vout.resize(1);
if (!fProofOfStake)
{
CReserveKey reservekey(pwallet);
- txNew.vout[0].scriptPubKey.SetDestination(reservekey.GetReservedKey().GetID());
+ txCoinBase.vout[0].scriptPubKey.SetDestination(reservekey.GetReservedKey().GetID());
+
+ // Add our coinbase tx as first transaction
+ pblock->vtx.push_back(txCoinBase);
}
else
- txNew.vout[0].SetEmpty();
+ {
+ // Coinbase output must be empty for Proof-of-Stake block
+ txCoinBase.vout[0].SetEmpty();
- // Add our coinbase tx as first transaction
- pblock->vtx.push_back(txNew);
+ // Syncronize timestamps
+ pblock->nTime = txCoinBase.nTime = txCoinStake->nTime;
+
+ // Add coinbase and coinstake transactions
+ pblock->vtx.push_back(txCoinBase);
+ pblock->vtx.push_back(*txCoinStake);
+ }
// Largest block you're willing to create:
unsigned int nBlockMaxSize = GetArg("-blockmaxsize", MAX_BLOCK_SIZE_GEN/2);
continue;
// Timestamp limit
- if (tx.nTime > GetAdjustedTime() || (fProofOfStake && tx.nTime > pblock->vtx[0].nTime))
+ if (tx.nTime > GetAdjustedTime() || (fProofOfStake && tx.nTime > txCoinStake->nTime))
continue;
// Simplify transaction fee - allow free = false
pblock->vtx[0].vout[0].nValue = GetProofOfWorkReward(pblock->nBits, nFees);
if (fDebug)
- printf("CreateNewBlock(): reward %" PRIu64 "\n", pblock->vtx[0].vout[0].nValue);
+ printf("CreateNewBlock(): PoW reward %" PRIu64 "\n", pblock->vtx[0].vout[0].nValue);
}
if (fDebug && GetBoolArg("-printpriority"))
// Fill in header
pblock->hashPrevBlock = pindexPrev->GetBlockHash();
- pblock->nTime = max(pindexPrev->GetMedianTimePast()+1, pblock->GetMaxTransactionTime());
- pblock->nTime = max(pblock->GetBlockTime(), PastDrift(pindexPrev->GetBlockTime()));
if (!fProofOfStake)
+ {
+ pblock->nTime = max(pindexPrev->GetMedianTimePast()+1, pblock->GetMaxTransactionTime());
+ pblock->nTime = max(pblock->GetBlockTime(), PastDrift(pindexPrev->GetBlockTime()));
pblock->UpdateTime(pindexPrev);
+ }
pblock->nNonce = 0;
}
return true;
}
+// Precalculated SHA256 contexts and metadata
+// (txid, vout.n) => (SHA256_CTX, (tx.nTime, nAmount))
+typedef std::map<std::pair<uint256, unsigned int>, std::pair<SHA256_CTX, std::pair<uint32_t, uint64_t> > > MidstateMap;
+
+// Fill the inputs map with precalculated states and metadata
+bool FillMap(CWallet *pwallet, uint32_t nUpperTime, MidstateMap &inputsMap)
+{
+ // Choose coins to use
+ int64_t nBalance = pwallet->GetBalance();
+
+ if (nBalance <= nReserveBalance)
+ return false;
+
+ uint32_t nTime = GetAdjustedTime();
+
+ CTxDB txdb("r");
+ {
+ LOCK2(cs_main, pwallet->cs_wallet);
+
+ CoinsSet setCoins;
+ int64_t nValueIn = 0;
+ if (!pwallet->SelectCoinsSimple(nBalance - nReserveBalance, MIN_TX_FEE, MAX_MONEY, nUpperTime, nCoinbaseMaturity * 10, setCoins, nValueIn))
+ return error("FillMap() : SelectCoinsSimple failed");
+
+ if (setCoins.empty())
+ return false;
+
+ CBlock block;
+ CTxIndex txindex;
+
+ for(CoinsSet::const_iterator pcoin = setCoins.begin(); pcoin != setCoins.end(); pcoin++)
+ {
+ pair<uint256, uint32_t> key = make_pair(pcoin->first->GetHash(), pcoin->second);
+
+ // Skip existent inputs
+ if (inputsMap.find(key) != inputsMap.end())
+ continue;
+
+ // Trying to parse scriptPubKey
+ txnouttype whichType;
+ vector<valtype> vSolutions;
+ if (!Solver(pcoin->first->vout[pcoin->second].scriptPubKey, whichType, vSolutions))
+ continue;
+
+ // Only support pay to public key and pay to address
+ if (whichType != TX_PUBKEY && whichType != TX_PUBKEYHASH)
+ continue;
+
+ // Load transaction index item
+ if (!txdb.ReadTxIndex(pcoin->first->GetHash(), txindex))
+ continue;
+
+ // Read block header
+ if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
+ continue;
+
+ // Only load coins meeting min age requirement
+ if (nStakeMinAge + block.nTime > nTime - nMaxStakeSearchInterval)
+ continue;
+
+ uint64_t nStakeModifier = 0;
+ if (!GetKernelStakeModifier(block.GetHash(), nStakeModifier))
+ continue;
+
+ SHA256_CTX ctx;
+ // Calculate midstate using (modifier, block time, tx offset, tx time, output number)
+ GetKernelMidstate(nStakeModifier, block.nTime, txindex.pos.nTxPos - txindex.pos.nBlockPos, pcoin->first->nTime, pcoin->second, ctx);
+
+ // (txid, vout.n) => (SHA256_CTX, (tx.nTime, nAmount))
+ inputsMap[key] = make_pair(ctx, make_pair(pcoin->first->nTime, pcoin->first->vout[pcoin->second].nValue));
+ }
+
+ if (fDebug)
+ printf("Stake miner: %" PRIszu " precalculated contexts created\n", inputsMap.size());
+ }
+
+ return true;
+}
+
+// Scan inputs map in order to find a solution
+bool ScanMap(const MidstateMap &inputsMap, uint32_t nBits, MidstateMap::key_type &LuckyInput, std::pair<uint256, uint32_t> &solution)
+{
+ static uint32_t nLastCoinStakeSearchTime = GetAdjustedTime(); // startup timestamp
+ uint32_t nSearchTime = GetAdjustedTime();
+
+ if (inputsMap.size() > 0 && nSearchTime > nLastCoinStakeSearchTime)
+ {
+ // Scanning interval (begintime, endtime)
+ std::pair<uint32_t, uint32_t> interval;
+
+ interval.first = nSearchTime;
+ interval.second = nSearchTime - min(nSearchTime-nLastCoinStakeSearchTime, nMaxStakeSearchInterval);
+
+ // (txid, nout) => (SHA256_CTX, (tx.nTime, nAmount))
+ for(MidstateMap::const_iterator input = inputsMap.begin(); input != inputsMap.end(); input++)
+ {
+ SHA256_CTX ctx = input->second.first;
+
+ // scan(State, Bits, Time, Amount, ...)
+ if (ScanMidstateBackward(ctx, nBits, input->second.second.first, input->second.second.second, interval, solution))
+ {
+ // Solution found
+ LuckyInput = input->first; // (txid, nout)
+
+ return true;
+ }
+ }
+
+ // Inputs map iteration can be big enough to consume few seconds while scanning.
+ // We're using dynamical calculation of scanning interval in order to compensate this delay.
+ nLastCoinStakeSearchInterval = nSearchTime - nLastCoinStakeSearchTime;
+ nLastCoinStakeSearchTime = nSearchTime;
+ }
+
+ // No solutions were found
+ return false;
+}
+
void StakeMiner(CWallet *pwallet)
{
SetThreadPriority(THREAD_PRIORITY_LOWEST);
// Make this thread recognisable as the mining thread
RenameThread("novacoin-miner");
+ MidstateMap inputsMap;
+ if (!FillMap(pwallet, GetAdjustedTime(), inputsMap))
+ return;
+
bool fTrySync = true;
- // Each thread has its own counter
- unsigned int nExtraNonce = 0;
+ CBlockIndex* pindexPrev = pindexBest;
+ uint32_t nBits = GetNextTargetRequired(pindexPrev, true);
while (true)
{
}
}
- //
- // Create new block
- //
- CBlockIndex* pindexPrev = pindexBest;
-
- auto_ptr<CBlock> pblock(CreateNewBlock(pwallet, true));
- if (!pblock.get())
- return;
- IncrementExtraNonce(pblock.get(), pindexPrev, nExtraNonce);
+ MidstateMap::key_type LuckyInput;
+ std::pair<uint256, uint32_t> solution;
- // Trying to sign a block
- if (pblock->SignBlock(*pwallet))
+ if (ScanMap(inputsMap, nBits, LuckyInput, solution))
{
SetThreadPriority(THREAD_PRIORITY_NORMAL);
- CheckStake(pblock.get(), *pwallet);
+
+ // Remove lucky input from the map
+ inputsMap.erase(inputsMap.find(LuckyInput));
+
+ CKey key;
+ CTransaction txCoinStake;
+
+ // Create new coinstake transaction
+ if (!pwallet->CreateCoinStake(LuckyInput.first, LuckyInput.second, solution.second, pindexPrev->nBits, txCoinStake, key))
+ {
+ string strMessage = _("Warning: Unable to create coinstake transaction, see debug.log for the details. Mining thread has been stopped.");
+ strMiscWarning = strMessage;
+ printf("*** %s\n", strMessage.c_str());
+
+ return;
+ }
+
+ // Now we have new coinstake, it's time to create the block ...
+ CBlock* pblock;
+ pblock = CreateNewBlock(pwallet, &txCoinStake);
+ if (!pblock)
+ {
+ string strMessage = _("Warning: Unable to allocate memory for the new block object. Mining thread has been stopped.");
+ strMiscWarning = strMessage;
+ printf("*** %s\n", strMessage.c_str());
+
+ return;
+ }
+
+ unsigned int nExtraNonce = 0;
+ IncrementExtraNonce(pblock, pindexPrev, nExtraNonce);
+
+ // ... and sign it
+ if (!key.Sign(pblock->GetHash(), pblock->vchBlockSig))
+ {
+ string strMessage = _("Warning: Proof-of-Stake miner is unable to sign the block (locked wallet?). Mining thread has been stopped.");
+ strMiscWarning = strMessage;
+ printf("*** %s\n", strMessage.c_str());
+
+ return;
+ }
+
+ CheckStake(pblock, *pwallet);
SetThreadPriority(THREAD_PRIORITY_LOWEST);
Sleep(500);
}
- else
- Sleep(nMinerSleep);
+
+ if (pindexPrev != pindexBest)
+ {
+ // The best block has been changed, we need to refill the map
+ if (FillMap(pwallet, GetAdjustedTime(), inputsMap))
+ {
+ pindexPrev = pindexBest;
+ nBits = GetNextTargetRequired(pindexPrev, true);
+ }
+ else
+ {
+ // Clear existent data if FillMap failed
+ inputsMap.clear();
+ }
+ }
+
+ Sleep(500);
continue;
}
git://git.novaco.in / novacoin.git / blobdiff