123 lines
3.9 KiB
JavaScript
123 lines
3.9 KiB
JavaScript
var bignum = require('bignum');
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var merkleTree = require('./merkleTree.js');
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var transactions = require('./transactions.js');
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var util = require('./util.js');
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/**
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* The BlockTemplate class holds a single job.
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* and provides several methods to validate and submit it to the daemon coin
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**/
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var BlockTemplate = module.exports = function BlockTemplate(maxDifficulty, jobId, rpcData, publicKey, extraNoncePlaceholder, reward, txMessages){
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//private members
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var submits = [];
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function getMerkleHashes(steps){
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return steps.map(function(step){
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return step.toString('hex');
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});
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}
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function getTransactionBuffers(txs){
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var txHashes = txs.map(function(tx){
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return util.uint256BufferFromHash(tx.hash);
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});
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return [null].concat(txHashes);
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}
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//public members
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this.rpcData = rpcData;
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this.jobId = jobId;
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/*
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Use the 'target' field if available, but some daemons only return the 'bits' field
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*/
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this.target = rpcData.target ?
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bignum.fromBuffer(new Buffer(rpcData.target, 'hex')) :
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util.bignumFromBits(rpcData.bits);
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this.difficulty = maxDifficulty.div(this.target).toNumber();
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this.prevHashReversed = util.reverseByteOrder(new Buffer(rpcData.previousblockhash, 'hex')).toString('hex');
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this.transactionData = Buffer.concat(rpcData.transactions.map(function(tx){
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return new Buffer(tx.data, 'hex');
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}));
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this.merkleTree = new merkleTree(getTransactionBuffers(rpcData.transactions));
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this.merkleBranch = getMerkleHashes(this.merkleTree.steps);
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this.generationTransaction = transactions.CreateGeneration(
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rpcData,
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publicKey,
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extraNoncePlaceholder,
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reward,
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txMessages
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);
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this.serializeCoinbase = function(extraNonce1, extraNonce2){
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return Buffer.concat([
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this.generationTransaction[0],
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extraNonce1,
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extraNonce2,
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this.generationTransaction[1]
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]);
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};
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//https://en.bitcoin.it/wiki/Protocol_specification#Block_Headers
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this.serializeHeader = function(merkleRoot, nTime, nonce){
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var header = new Buffer(80);
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var position = 0;
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header.write(nonce, position, 4, 'hex');
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header.write(rpcData.bits, position += 4, 4, 'hex');
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header.write(nTime, position += 4, 4, 'hex');
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header.write(merkleRoot, position += 4, 32, 'hex');
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header.write(rpcData.previousblockhash, position += 32, 32, 'hex');
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header.writeUInt32BE(rpcData.version, position + 32);
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var header = util.reverseBuffer(header);
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return header;
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};
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this.serializeBlock = function(header, coinbase){
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return Buffer.concat([
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header,
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util.varIntBuffer(this.rpcData.transactions.length + 1),
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coinbase,
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this.transactionData,
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//POS coins require a zero byte appended to block which the daemon replaces with the signature
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new Buffer(reward === 'POS' ? [0] : [])
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]);
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};
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this.registerSubmit = function(extraNonce1, extraNonce2, nTime, nonce){
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var submission = extraNonce1 + extraNonce2 + nTime + nonce;
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if (submits.indexOf(submission) === -1){
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submits.push(submission);
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return true;
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}
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return false;
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};
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this.getJobParams = function(){
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if (!this.jobParams){
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this.jobParams = [
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this.jobId,
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this.prevHashReversed,
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this.generationTransaction[0].toString('hex'),
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this.generationTransaction[1].toString('hex'),
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this.merkleBranch,
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util.packInt32BE(this.rpcData.version).toString('hex'),
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this.rpcData.bits,
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util.packUInt32BE(this.rpcData.curtime).toString('hex'),
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true
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];
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}
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return this.jobParams;
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};
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}; |