611 lines
13 KiB
JavaScript
611 lines
13 KiB
JavaScript
/**
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* peer.js - peer 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 inherits = require('inherits');
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var EventEmitter = require('events').EventEmitter;
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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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* Peer
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*/
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function Peer(pool, createConnection, options) {
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var self = this;
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if (!(this instanceof Peer))
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return new Peer(pool, createConnection, options);
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EventEmitter.call(this);
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this.options = options || {};
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this.pool = pool;
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this.socket = null;
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this.parser = new bcoin.protocol.parser();
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this.framer = new bcoin.protocol.framer();
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this.chain = this.pool.chain;
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this.bloom = this.pool.bloom;
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this.version = null;
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this.destroyed = false;
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this.ack = false;
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this.connected = false;
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this.ts = this.options.ts || 0;
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this.host = null;
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this.port = 0;
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this.challenge = null;
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this.lastPong = 0;
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this.banScore = 0;
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this.orphans = 0;
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this.orphanTime = 0;
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this.socket = createConnection.call(pool, this, options);
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if (!this.socket)
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throw new Error('No socket');
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this._broadcast = {
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timeout: this.options.broadcastTimeout || 30000,
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interval: this.options.broadcastInterval || 3000,
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map: {}
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};
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this._request = {
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timeout: this.options.requestTimeout || 10000,
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cont: {},
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skip: {},
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queue: []
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};
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this._ping = {
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timer: null,
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interval: this.options.pingInterval || 30000
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};
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this._queue = [];
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Peer.uid.iaddn(1);
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this.id = Peer.uid.toString(10);
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this.setMaxListeners(10000);
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this._init();
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}
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inherits(Peer, EventEmitter);
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Peer.uid = new bn(0);
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Peer.prototype._init = function init() {
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var self = this;
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if (!this.host)
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this.host = this.socket.remoteAddress || this.socket._host || null;
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if (!this.port)
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this.port = this.socket.remotePort || 0;
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this.socket.once('connect', function() {
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self.ts = utils.now();
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self.connected = true;
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if (!self.host)
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self.host = self.socket.remoteAddress;
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if (!self.port)
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self.port = self.socket.remotePort;
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self.emit('connect');
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});
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this.socket.once('error', function(err) {
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self._error(err);
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self.pool.setMisbehavior(self, 100);
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});
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this.socket.once('close', function() {
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self._error('socket hangup');
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self.connected = false;
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});
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this.socket.on('data', function(chunk) {
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self.parser.feed(chunk);
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});
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this.parser.on('packet', function(packet) {
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self._onPacket(packet);
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});
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this.parser.on('error', function(err) {
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self._error(err);
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// Something is wrong here.
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// Ignore this peer.
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self.pool.setMisbehavior(self, 100);
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});
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if (this.pool.options.fullNode) {
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this.once('version', function() {
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utils.debug(
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'Sent version (%s): height=%s',
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self.host, this.pool.chain.height());
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});
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}
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this._ping.timer = setInterval(function() {
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self.challenge = utils.nonce();
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self._write(self.framer.ping({
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nonce: self.challenge
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}));
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}, this._ping.interval);
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this._req('verack', function(err, payload) {
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if (err) {
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self._error(err);
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self.destroy();
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return;
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}
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self.ack = true;
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self.emit('ack');
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self.ts = utils.now();
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self._write(self.framer.packet('getaddr', []));
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// if (self.pool.options.headers) {
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// if (self.version && self.version.v > 70012)
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// self._write(self.framer.packet('sendheaders', []));
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// }
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});
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// Send hello
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this._write(this.framer.version({
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height: this.pool.chain.height(),
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relay: this.options.relay
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}));
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};
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Peer.prototype.broadcast = function broadcast(items) {
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var self = this;
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var result;
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if (this.destroyed)
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return;
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if (!Array.isArray(items))
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items = [ items ];
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result = items.map(function(item) {
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var key = item.hash('hex');
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var old = this._broadcast.map[key];
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if (old) {
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clearTimeout(old.timer);
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clearInterval(old.interval);
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}
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var inv = this.framer.inv([{
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type: item.type,
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hash: item.hash()
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}]);
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// Auto-cleanup broadcast map after timeout
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var entry = {
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e: new EventEmitter(),
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timeout: setTimeout(function() {
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entry.e.emit('timeout');
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clearInterval(entry.interval);
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delete self._broadcast.map[key];
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}, this._broadcast.timeout),
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// Retransmit
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interval: setInterval(function() {
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self._write(inv);
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}, this._broadcast.interval),
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type: item.type,
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value: item.render()
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};
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this._broadcast.map[key] = entry;
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return entry.e;
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}, this);
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this._write(this.framer.inv(items.map(function(item) {
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return {
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type: item.type,
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hash: item.hash()
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};
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})));
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return result;
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};
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Peer.prototype.updateWatch = function updateWatch() {
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if (this.pool.options.fullNode)
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return;
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if (this.ack)
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this._write(this.framer.filterLoad(this.bloom, 'none'));
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};
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Peer.prototype.destroy = function destroy() {
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var i;
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if (this.destroyed)
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return;
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this.destroyed = true;
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this.socket.destroy();
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this.socket = null;
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this.emit('close');
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// Clean-up timeouts
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Object.keys(this._broadcast.map).forEach(function(key) {
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clearTimeout(this._broadcast.map[key].timer);
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clearInterval(this._broadcast.map[key].interval);
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}, this);
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clearInterval(this._ping.timer);
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this._ping.timer = null;
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for (i = 0; i < this._request.queue.length; i++)
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clearTimeout(this._request.queue[i].timer);
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};
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Peer.prototype._write = function write(chunk) {
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var self = this;
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if (this.destroyed)
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return;
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this.socket.write(new Buffer(chunk));
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};
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Peer.prototype._error = function error(err) {
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if (this.destroyed)
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return;
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if (typeof err === 'string')
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err = new Error(err);
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err.message += ' (' + this.host + ')';
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this.destroy();
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this.emit('error', err);
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};
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Peer.prototype._req = function _req(cmd, cb) {
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var self = this;
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if (this.destroyed)
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return cb(new Error('Destroyed, sorry'));
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var entry = {
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cmd: cmd,
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cb: cb,
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ontimeout: function() {
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var i = self._request.queue.indexOf(entry);
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if (i !== -1) {
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self._request.queue.splice(i, 1);
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cb(new Error('Timed out: ' + cmd), null);
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}
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},
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timer: null
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};
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entry.timer = setTimeout(entry.ontimeout, this._request.timeout);
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this._request.queue.push(entry);
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return entry;
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};
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Peer.prototype._res = function _res(cmd, payload) {
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var i, entry, res;
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for (i = 0; i < this._request.queue.length; i++) {
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entry = this._request.queue[i];
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if (!entry || (entry.cmd && entry.cmd !== cmd))
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return false;
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res = entry.cb(null, payload, cmd);
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if (res === this._request.cont) {
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assert(!entry.cmd);
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// Restart timer
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if (!this.destroyed)
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entry.timer = setTimeout(entry.ontimeout, this._request.timeout);
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return true;
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} else if (res !== this._request.skip) {
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this._request.queue.shift();
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clearTimeout(entry.timer);
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entry.timer = null;
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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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Peer.prototype.getData = function getData(items) {
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this._write(this.framer.getData(items));
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};
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Peer.prototype._onPacket = function onPacket(packet) {
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var cmd = packet.cmd;
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var payload = packet.payload;
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if (cmd === 'version')
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return this._handleVersion(payload);
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if (cmd === 'inv')
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return this._handleInv(payload);
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if (cmd === 'headers')
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return this._handleHeaders(payload);
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if (cmd === 'getdata')
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return this._handleGetData(payload);
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if (cmd === 'addr')
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return this._handleAddr(payload);
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if (cmd === 'ping')
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return this._handlePing(payload);
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if (cmd === 'pong')
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return this._handlePong(payload);
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if (cmd === 'getaddr')
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return this._handleGetAddr();
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if (cmd === 'reject')
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return this._handleReject(payload);
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if (cmd === 'merkleblock' || cmd === 'block') {
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payload.network = true;
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payload.relayedBy = this.host || '0.0.0.0';
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payload = bcoin.block(payload, cmd);
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this.lastBlock = payload;
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} else if (cmd === 'tx') {
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payload.network = true;
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payload.relayedBy = this.host || '0.0.0.0';
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payload = bcoin.tx(payload, this.lastBlock);
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}
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if (this._res(cmd, payload))
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return;
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this.emit(cmd, payload);
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};
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Peer.prototype._handleVersion = function handleVersion(payload) {
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if (payload.v < constants.minVersion)
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return this._error('peer doesn\'t support required protocol version');
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// ACK
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this._write(this.framer.verack());
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this.version = payload;
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this.emit('version', payload);
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};
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Peer.prototype._handleGetData = function handleGetData(items) {
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items.forEach(function(item) {
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// Filter out not broadcasted things
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var hash = utils.toHex(item.hash);
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if (!this._broadcast.map[hash])
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return;
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var entry = this._broadcast.map[hash];
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this._write(this.framer.packet(entry.type, entry.value));
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entry.e.emit('request');
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}, this);
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};
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Peer.prototype._handleAddr = function handleAddr(addrs) {
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var now = utils.now();
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addrs.forEach(function(addr) {
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var ip, address4, address6;
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if (addr.ts <= 100000000 || addr.ts > now + 10 * 60)
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addr.ts = now - 5 * 24 * 60 * 60;
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ip = addr.ipv4 !== '0.0.0.0'
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? addr.ipv4
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: addr.ipv6;
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address4 = addr.ipv4 !== '0.0.0.0'
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? addr.ipv4 + ':' + addr.port
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: null;
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address6 = '[' + addr.ipv6 + ']:' + addr.port;
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this.emit('addr', {
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date: new Date(addr.ts * 1000),
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ts: addr.ts,
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services: addr.services,
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ip: ip,
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ipv4: addr.ipv4,
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ipv6: addr.ipv6,
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host: ip,
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host4: addr.ipv4,
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host6: addr.ipv6,
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port: addr.port || network.port,
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address: address4 || address6,
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address4: address4,
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address6: address6
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});
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}, this);
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utils.debug(
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'Recieved %d peers (seeds=%d, peers=%d).',
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addrs.length,
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this.pool.seeds.length,
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this.pool.peers.all.length);
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};
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Peer.prototype._handlePing = function handlePing(data) {
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this._write(this.framer.pong({
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nonce: data.nonce
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}));
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this.emit('ping', data);
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};
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Peer.prototype._handlePong = function handlePong(data) {
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if (!this.challenge || this.challenge.cmp(data.nonce) !== 0)
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return this.emit('pong', false);
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this.lastPong = utils.now();
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return this.emit('pong', true);
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};
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Peer.prototype._handleGetAddr = function handleGetAddr() {
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var hosts = {};
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var peers;
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peers = this.pool.peers.all.map(function(peer) {
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var ip, version;
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if (!peer.socket || !peer.socket.remoteAddress)
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return;
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ip = peer.socket.remoteAddress;
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version = utils.isIP(ip);
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if (!version)
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return;
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if (hosts[ip])
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return;
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hosts[ip] = true;
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return {
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ts: peer.ts,
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services: peer.version ? peer.version.services : null,
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ipv4: version === 4 ? ip : null,
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ipv6: version === 6 ? ip : null,
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port: peer.socket.remotePort || network.port
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};
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}).filter(Boolean);
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return this._write(this.framer.addr(peers));
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};
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Peer.prototype._handleInv = function handleInv(items) {
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var req, i, block, hash;
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this.emit('inv', items);
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// Always request advertised TXs
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var txs = items.filter(function(item) {
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return item.type === 'tx';
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});
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// Emit new blocks to schedule them between multiple peers
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var blocks = items.filter(function(item) {
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return item.type === 'block';
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}, this).map(function(item) {
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return item.hash;
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});
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if (blocks.length === 1)
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this.bestHash = utils.toHex(blocks[0]);
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this.emit('blocks', blocks);
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if (txs.length === 0)
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return;
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this.emit('txs', txs.map(function(tx) {
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return tx.hash;
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}));
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this.getData(txs);
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};
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Peer.prototype._handleHeaders = function handleHeaders(headers) {
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var self = this;
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headers = headers.map(function(header) {
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header.prevBlock = utils.toHex(header.prevBlock);
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header.merkleRoot = utils.toHex(header.merkleRoot);
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header.hash = utils.toHex(utils.dsha256(header._raw));
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return header;
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});
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this.emit('headers', headers);
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};
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Peer.prototype._handleReject = function handleReject(payload) {
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var hash = utils.toHex(payload.data);
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var entry = this._broadcast.map[hash];
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this.emit('reject', payload);
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if (!entry)
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return;
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entry.e.emit('reject', payload);
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};
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Peer.prototype.loadHeaders = function loadHeaders(hashes, stop) {
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utils.debug(
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'Requesting headers packet from %s with getheaders',
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this.host);
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utils.debug('Height: %s, Hash: %s, Stop: %s',
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this.pool.chain.getHeight(hashes[0]),
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hashes ? utils.revHex(hashes[0]) : 0,
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stop ? utils.revHex(stop) : 0);
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this._write(this.framer.getHeaders(hashes, stop));
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};
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Peer.prototype.loadBlocks = function loadBlocks(hashes, stop) {
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utils.debug(
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'Requesting inv packet from %s with getblocks',
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this.host);
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utils.debug('Height: %s, Hash: %s, Stop: %s',
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this.pool.chain.getHeight(hashes[0]),
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hashes ? utils.revHex(hashes[0]) : 0,
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stop ? utils.revHex(stop) : 0);
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this._write(this.framer.getBlocks(hashes, stop));
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};
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Peer.prototype.loadItems = function loadItems(hashes, stop) {
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if (this.pool.options.headers)
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return this.loadHeaders(hashes, stop);
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return this.loadBlocks(hashes, stop);
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};
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Peer.prototype.loadMempool = function loadMempool() {
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utils.debug(
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'Requesting inv packet from %s with mempool',
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this.host);
|
|
this._write(this.framer.mempool());
|
|
};
|
|
|
|
Peer.prototype.reject = function reject(details) {
|
|
utils.debug(
|
|
'Sending reject packet to %s',
|
|
this.host);
|
|
|
|
this._write(this.framer.reject(details));
|
|
};
|
|
|
|
/**
|
|
* Expose
|
|
*/
|
|
|
|
module.exports = Peer;
|