79 lines
2.1 KiB
JavaScript
79 lines
2.1 KiB
JavaScript
'use strict';
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var Message = require('../message');
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var inherits = require('util').inherits;
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var bitcore = require('bitcore');
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var utils = require('../utils');
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var BufferReader = bitcore.encoding.BufferReader;
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var BufferWriter = bitcore.encoding.BufferWriter;
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var $ = bitcore.util.preconditions;
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var protocolVersion = 70000;
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var magicNumber = bitcore.Networks.defaultNetwork.networkMagic.readUInt32LE(0);
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/**
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* Request block headers starting from a hash
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*
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* @param{Array} starts - array of buffers with the starting block hashes
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* @param{Buffer} [stop] - hash of the last block
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*/
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function GetheadersMessage(options) {
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if (!(this instanceof GetheadersMessage)) {
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return new GetheadersMessage(options);
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}
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if(!options) {
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options = {};
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}
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Message.call(this, options);
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this.command = 'getheaders';
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this.version = protocolVersion;
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this.magicNumber = magicNumber;
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options = utils.sanitizeStartStop(options);
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this.starts = options.starts;
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this.stop = options.stop;
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}
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inherits(GetheadersMessage, Message);
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GetheadersMessage.fromObject = function(obj) {
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return new GetheadersMessage(obj);
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};
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GetheadersMessage.fromBuffer = function(payload) {
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var obj = {};
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var parser = new BufferReader(payload);
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$.checkArgument(!parser.finished(), 'No data received in payload');
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obj.version = parser.readUInt32LE();
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var startCount = Math.min(parser.readVarintNum(), 500);
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obj.starts = [];
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for (var i = 0; i < startCount; i++) {
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obj.starts.push(parser.read(32));
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}
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obj.stop = parser.read(32);
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utils.checkFinished(parser);
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return GetheadersMessage.fromObject(obj);
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};
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GetheadersMessage.prototype.getPayload = function() {
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var bw = new BufferWriter();
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bw.writeUInt32LE(this.version);
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bw.writeVarintNum(this.starts.length);
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for (var i = 0; i < this.starts.length; i++) {
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bw.write(this.starts[i]);
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}
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if (this.stop.length !== 32) {
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throw new Error('Invalid hash length: ' + this.stop.length);
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}
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bw.write(this.stop);
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return bw.concat();
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};
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module.exports = function(options) {
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protocolVersion = options.protocolVersion || protocolVersion;
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magicNumber = options.magicNumber || magicNumber;
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return GetheadersMessage;
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};
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