117 lines
2.9 KiB
JavaScript
117 lines
2.9 KiB
JavaScript
/**
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* abstractblock.js - abstract block object for bcoin
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* Copyright (c) 2014-2015, Fedor Indutny (MIT License)
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* https://github.com/indutny/bcoin
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*/
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var bcoin = require('../bcoin');
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var bn = require('bn.js');
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var utils = bcoin.utils;
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var assert = utils.assert;
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var constants = bcoin.protocol.constants;
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var network = bcoin.protocol.network;
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/**
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* AbstractBlock
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*/
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function AbstractBlock(data) {
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var self = this;
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if (!(this instanceof AbstractBlock))
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return new AbstractBlock(data);
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this.type = null;
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this.version = data.version;
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this.prevBlock = utils.toHex(data.prevBlock);
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this.merkleRoot = utils.toHex(data.merkleRoot);
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this.ts = data.ts;
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this.bits = data.bits;
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this.nonce = data.nonce;
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this.totalTX = data.totalTX;
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this.height = data.height != null ? data.height : -1;
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this._raw = data._raw || null;
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this._size = data._size || 0;
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this._chain = data.chain;
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this.valid = null;
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this._hash = null;
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// https://gist.github.com/sipa/bf69659f43e763540550
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// http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-August/010396.html
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this.versionBits = (this.version >>> 29) & 7;
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this.realVersion = this.version & 0x1fffffff;
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this.highVersion = this.version & 0x1ffffff8;
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this.lowVersion = this.version & 7;
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}
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AbstractBlock.prototype.hash = function hash(enc) {
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if (!this._hash)
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this._hash = utils.dsha256(this.abbr());
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return enc === 'hex' ? utils.toHex(this._hash) : this._hash;
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};
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AbstractBlock.prototype.abbr = function abbr() {
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var res;
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if (this._raw)
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return this._raw.slice(0, 80);
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res = new Buffer(80);
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utils.write32(res, this.version, 0);
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utils.copy(new Buffer(this.prevBlock, 'hex'), res, 4);
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utils.copy(new Buffer(this.merkleRoot, 'hex'), res, 36);
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utils.writeU32(res, this.ts, 68);
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utils.writeU32(res, this.bits, 72);
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utils.writeU32(res, this.nonce, 76);
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return res;
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};
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AbstractBlock.prototype.getSize = function getSize() {
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return this._size || this.render().length;
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};
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AbstractBlock.prototype.verify = function verify() {
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if (this.valid == null)
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this.valid = this._verify();
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return this.valid;
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};
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AbstractBlock.prototype.verifyHeaders = function verifyHeaders() {
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// Check proof of work
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if (!utils.testTarget(this.bits, this.hash())) {
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utils.debug('Block failed POW test: %s', this.rhash);
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return false;
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}
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// Check timestamp against now + 2 hours
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if (this.ts > utils.now() + 2 * 60 * 60) {
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utils.debug('Block timestamp is too high: %s', this.rhash);
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return false;
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}
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return true;
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};
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AbstractBlock.prototype.isGenesis = function isGenesis() {
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return this.hash('hex') === network.genesis.hash;
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};
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AbstractBlock.prototype.__defineGetter__('chain', function() {
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return this._chain || bcoin.chain.global;
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});
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AbstractBlock.prototype.__defineGetter__('rhash', function() {
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return utils.revHex(this.hash('hex'));
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});
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/**
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* Expose
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*/
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module.exports = AbstractBlock;
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