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@ -87,7 +87,7 @@ void UpdateTime(CBlockHeader* pblock, const CBlockIndex* pindexPrev) |
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pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, Params().GetConsensus()); |
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pblock->nBits = GetNextWorkRequired(pindexPrev, pblock, Params().GetConsensus()); |
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} |
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} |
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CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn) |
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CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn, CBlockIndex*& pindexPrev) |
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{ |
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{ |
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// Create new block
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// Create new block
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auto_ptr<CBlockTemplate> pblocktemplate(new CBlockTemplate()); |
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auto_ptr<CBlockTemplate> pblocktemplate(new CBlockTemplate()); |
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@ -132,7 +132,7 @@ CBlockTemplate* CreateNewBlock(const CScript& scriptPubKeyIn) |
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{ |
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{ |
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LOCK2(cs_main, mempool.cs); |
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LOCK2(cs_main, mempool.cs); |
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CBlockIndex* pindexPrev = chainActive.Tip(); |
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pindexPrev = chainActive.Tip(); |
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const int nHeight = pindexPrev->nHeight + 1; |
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const int nHeight = pindexPrev->nHeight + 1; |
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CCoinsViewCache view(pcoinsTip); |
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CCoinsViewCache view(pcoinsTip); |
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@ -365,45 +365,34 @@ void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& |
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//
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//
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// ScanHash scans nonces looking for a hash with at least some zero bits.
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// ScanHash scans nonces looking for a hash with at least some zero bits.
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// The nonce is usually preserved between calls, but periodically or if the
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// The nonce is usually preserved between calls, but periodically the block is
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// nonce is 0xffff0000 or above, the block is rebuilt and nNonce starts over at
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// rebuilt and nNonce starts over at zero.
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// zero.
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//
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//
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bool static ScanHash(const CBlockHeader *pblock, uint32_t& nNonce, uint256 *phash) |
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bool static ScanHash(CBlockHeader *pblock, uint256 *phash) |
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{ |
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{ |
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// Write the first 76 bytes of the block header to a double-SHA256 state.
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CHash256 hasher; |
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CDataStream ss(SER_NETWORK, PROTOCOL_VERSION); |
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ss << *pblock; |
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assert(ss.size() == 80); |
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hasher.Write((unsigned char*)&ss[0], 76); |
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while (true) { |
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while (true) { |
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nNonce++; |
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pblock->nNonce++; |
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*phash = pblock->GetHash(); |
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// Write the last 4 bytes of the block header (the nonce) to a copy of
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// the double-SHA256 state, and compute the result.
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CHash256(hasher).Write((unsigned char*)&nNonce, 4).Finalize((unsigned char*)phash); |
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// Return the nonce if the hash has at least some zero bits,
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// Return the nonce if the hash has at least some zero bits,
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// caller will check if it has enough to reach the target
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// caller will check if it has enough to reach the target
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if (((uint16_t*)phash)[15] == 0) |
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if (((uint16_t*)phash)[15] == 0) |
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return true; |
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return true; |
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// If nothing found after trying for a while, return -1
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// If nothing found after trying for a while, return false.
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if ((nNonce & 0xfff) == 0) |
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if ((pblock->nNonce & 0xfff) == 0) |
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return false; |
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return false; |
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} |
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} |
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} |
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} |
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CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey) |
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CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey, CBlockIndex*& pindexPrev) |
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{ |
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{ |
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CPubKey pubkey; |
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CPubKey pubkey; |
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if (!reservekey.GetReservedKey(pubkey)) |
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if (!reservekey.GetReservedKey(pubkey)) |
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return NULL; |
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return NULL; |
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CScript scriptPubKey = CScript() << ToByteVector(pubkey) << OP_CHECKSIG; |
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CScript scriptPubKey = CScript() << ToByteVector(pubkey) << OP_CHECKSIG; |
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return CreateNewBlock(scriptPubKey); |
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return CreateNewBlock(scriptPubKey, pindexPrev); |
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} |
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} |
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static bool ProcessBlockFound(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey) |
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static bool ProcessBlockFound(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey) |
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@ -435,6 +424,56 @@ static bool ProcessBlockFound(CBlock* pblock, CWallet& wallet, CReserveKey& rese |
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return true; |
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return true; |
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} |
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} |
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bool static ScanLoop(CBlock *pblock, CBlockIndex *pindexPrev, CWallet *pwallet, CReserveKey& reservekey) |
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{ |
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UpdateTime(pblock, pindexPrev); |
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arith_uint256 hashTarget = arith_uint256().SetCompact(pblock->nBits); |
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uint256 hash; |
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if (ScanHash(pblock, &hash)) { |
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if (UintToArith256(hash) <= hashTarget) { |
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// Found a solution
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SetThreadPriority(THREAD_PRIORITY_NORMAL); |
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LogPrintf("BitcoinMiner:\n"); |
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LogPrintf("proof-of-work found \n hash: %s \ntarget: %s\n", hash.GetHex(), hashTarget.GetHex()); |
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ProcessBlockFound(pblock, *pwallet, reservekey); |
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SetThreadPriority(THREAD_PRIORITY_LOWEST); |
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return true; |
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} |
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} |
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return false; |
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} |
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bool MineBlock(CWallet *pwallet, uint256& hash) |
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{ |
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CReserveKey reservekey(pwallet); |
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unsigned int nExtraNonce = 0; |
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while (true) { |
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CBlockIndex *pindexPrev; |
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auto_ptr<CBlockTemplate> pblocktemplate(CreateNewBlockWithKey(reservekey, pindexPrev)); |
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if (!pblocktemplate.get()) { |
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return false; |
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} |
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CBlock *pblock = &pblocktemplate->block; |
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IncrementExtraNonce(pblock, pindexPrev, nExtraNonce); |
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while (true) { |
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if (ScanLoop(pblock, pindexPrev, pwallet, reservekey)) { |
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hash = pblock->GetHash(); |
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return true; |
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} |
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boost::this_thread::interruption_point(); |
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if (pblock->nNonce >= 0xffff0000) |
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break; |
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} |
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} |
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} |
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void static BitcoinMiner(CWallet *pwallet) |
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void static BitcoinMiner(CWallet *pwallet) |
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{ |
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{ |
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LogPrintf("BitcoinMiner started\n"); |
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LogPrintf("BitcoinMiner started\n"); |
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@ -458,9 +497,9 @@ void static BitcoinMiner(CWallet *pwallet) |
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// Create new block
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// Create new block
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//
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//
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unsigned int nTransactionsUpdatedLast = mempool.GetTransactionsUpdated(); |
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unsigned int nTransactionsUpdatedLast = mempool.GetTransactionsUpdated(); |
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CBlockIndex* pindexPrev = chainActive.Tip(); |
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CBlockIndex* pindexPrev; |
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auto_ptr<CBlockTemplate> pblocktemplate(CreateNewBlockWithKey(reservekey)); |
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auto_ptr<CBlockTemplate> pblocktemplate(CreateNewBlockWithKey(reservekey, pindexPrev)); |
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if (!pblocktemplate.get()) |
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if (!pblocktemplate.get()) |
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{ |
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{ |
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LogPrintf("Error in BitcoinMiner: Keypool ran out, please call keypoolrefill before restarting the mining thread\n"); |
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LogPrintf("Error in BitcoinMiner: Keypool ran out, please call keypoolrefill before restarting the mining thread\n"); |
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@ -476,52 +515,23 @@ void static BitcoinMiner(CWallet *pwallet) |
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// Search
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// Search
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//
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//
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int64_t nStart = GetTime(); |
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int64_t nStart = GetTime(); |
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arith_uint256 hashTarget = arith_uint256().SetCompact(pblock->nBits); |
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uint256 hash; |
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uint32_t nNonce = 0; |
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while (true) { |
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while (true) { |
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// Check if something found
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// Check if something found
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if (ScanHash(pblock, nNonce, &hash)) |
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if (ScanLoop(pblock, pindexPrev, pwallet, reservekey)) |
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{ |
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break; |
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if (UintToArith256(hash) <= hashTarget) |
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{ |
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// Found a solution
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pblock->nNonce = nNonce; |
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assert(hash == pblock->GetHash()); |
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SetThreadPriority(THREAD_PRIORITY_NORMAL); |
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LogPrintf("BitcoinMiner:\n"); |
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LogPrintf("proof-of-work found \n hash: %s \ntarget: %s\n", hash.GetHex(), hashTarget.GetHex()); |
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ProcessBlockFound(pblock, *pwallet, reservekey); |
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SetThreadPriority(THREAD_PRIORITY_LOWEST); |
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// In regression test mode, stop mining after a block is found.
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if (Params().MineBlocksOnDemand()) |
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throw boost::thread_interrupted(); |
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break; |
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} |
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} |
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// Check for stop or if block needs to be rebuilt
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// Check for stop or if block needs to be rebuilt
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boost::this_thread::interruption_point(); |
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boost::this_thread::interruption_point(); |
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// Regtest mode doesn't require peers
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// Regtest mode doesn't require peers
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if (vNodes.empty() && Params().MiningRequiresPeers()) |
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if (vNodes.empty() && Params().MiningRequiresPeers()) |
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break; |
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break; |
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if (nNonce >= 0xffff0000) |
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if (pblock->nNonce >= 0xffff0000) |
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break; |
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break; |
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if (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast && GetTime() - nStart > 60) |
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if (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast && GetTime() - nStart > 60) |
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break; |
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break; |
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if (pindexPrev != chainActive.Tip()) |
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if (pindexPrev != chainActive.Tip()) |
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break; |
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break; |
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// Update nTime every few seconds
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UpdateTime(pblock, pindexPrev); |
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if (Params().AllowMinDifficultyBlocks()) |
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{ |
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// Changing pblock->nTime can change work required on testnet:
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hashTarget.SetCompact(pblock->nBits); |
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} |
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} |
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} |
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} |
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} |
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} |
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} |
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Wladimir J. van der Laan
10 years ago