比特幣原始碼解讀之執行緒處理-礦工執行緒
阿新 • • 發佈：2019-01-07
(本文使用的是比特幣v0.1.0版本 點選下載原始碼)
比特幣原始碼解讀之執行緒處理分為兩篇，礦工執行緒處理和其他執行緒處理兩篇，本文描述礦工執行緒處理，主要包含創幣交易的產生、當前交易的打包處理，工作量等相關內容。流程圖如下所示:
新建礦工執行緒
if(_beginthread(ThreadBitcoinMiner,0, NULL)==-1)printf("Error: _beginthread(ThreadBitcoinMiner) failed\n");
執行礦工處理函式
voidThreadBitcoinMiner(void* parg){vfThreadRunning[3]=true;CheckForShutdown(3);try{bool fRet =BitcoinMiner();printf("BitcoinMiner returned %s\n\n\n", fRet ?"true":"false");}CATCH_PRINT_EXCEPTION("BitcoinMiner()")vfThreadRunning[3]=false;}
生成公鑰和私鑰
利用openssl庫生成
CKey key;key.MakeNewKey();voidMakeNewKey(){if(!EC_KEY_generate_key(pkey))throw key_error("CKey::MakeNewKey() : EC_KEY_generate_key failed");}
建立創幣交易
輸入為NULL，輸出為本節點地址
CTransaction txNew;txNew.vin.resize(1);txNew.vin[0].prevout.SetNull();txNew.vin[0].scriptSig << nBits <<++bnExtraNonce;txNew.vout.resize(1);txNew.vout[0].scriptPubKey << key.GetPubKey()<< OP_CHECKSIG;
建立新塊並儲存創幣交易
auto_ptr<CBlock> pblock(newCBlock());if(!pblock.get())returnfalse;// Add our coinbase tx as first transactionpblock->vtx.push_back(txNew);
收集最新的驗證通過的交易
結束條件是：
(1)mapTransactions中所有交易處理完
(2)區塊大小達到 MAX_SIZE/2才結束。
CTxDB txdb("r");map<uint256,CTxIndex> mapTestPool;vector<char> vfAlreadyAdded(mapTransactions.size());bool fFoundSomething =true;unsignedint nBlockSize =0;while(fFoundSomething && nBlockSize < MAX_SIZE/2){fFoundSomething =false;unsignedint n =0;for(map<uint256,CTransaction>::iterator mi = mapTransactions.begin(); mi != mapTransactions.end();++mi,++n){if(vfAlreadyAdded[n])continue;CTransaction& tx =(*mi).second;if(tx.IsCoinBase()||!tx.IsFinal())continue;// Transaction fee requirements, mainly only needed for flood control// Under 10K (about 80 inputs) is free for first 100 transactions// Base rate is 0.01 per KBint64 nMinFee = tx.GetMinFee(pblock->vtx.size()<100);map<uint256,CTxIndex> mapTestPoolTmp(mapTestPool);if(!tx.ConnectInputs(txdb, mapTestPoolTmp,CDiskTxPos(1,1,1),0, nFees,false,true, nMinFee))continue;swap(mapTestPool, mapTestPoolTmp);pblock->vtx.push_back(tx);nBlockSize +=::GetSerializeSize(tx, SER_NETWORK);vfAlreadyAdded[n]=true;fFoundSomething =true;}}
儲存輸出的位元組數、創幣交易以及繳費到新塊中
pblock->nBits = nBits;pblock->vtx[0].vout[0].nValue = pblock->GetBlockValue(nFees);
計算交易的Merkle值
tmp.block.nVersion = pblock->nVersion;tmp.block.hashPrevBlock = pblock->hashPrevBlock =(pindexPrev ? pindexPrev->GetBlockHash():0);tmp.block.hashMerkleRoot = pblock->hashMerkleRoot = pblock->BuildMerkleTree();tmp.block.nTime = pblock->nTime =