310 lines
8.6 KiB
JavaScript
310 lines
8.6 KiB
JavaScript
var imports = require('soop').imports();
|
|
var _ = imports._ || require('underscore');
|
|
var log = imports.log || require('../util/log');
|
|
var bitcoreDefaults = imports.config || require('../config');
|
|
var Connection = imports.Connection || require ('./Connection');
|
|
var Peer = imports.Peer || require('./Peer');
|
|
|
|
GetAdjustedTime = imports.GetAdjustedTime || function () {
|
|
// TODO: Implement actual adjustment
|
|
return Math.floor(new Date().getTime() / 1000);
|
|
};
|
|
|
|
function PeerManager(config) {
|
|
// extend defaults with config
|
|
this.config = _.extend(bitcoreDefaults, config || {});
|
|
this.active = false;
|
|
this.timer = null;
|
|
|
|
this.peers = [];
|
|
this.pool = [];
|
|
this.connections = [];
|
|
this.isConnected = false;
|
|
this.peerDiscovery = false;
|
|
|
|
// Move these to the Node's settings object
|
|
this.interval = 5000;
|
|
this.minConnections = 8;
|
|
this.minKnownPeers = 10;
|
|
|
|
// keep track of tried seeds and results
|
|
this.seeds = {
|
|
resolved: [],
|
|
failed: []
|
|
};
|
|
}
|
|
|
|
PeerManager.parent = imports.parent || require('events').EventEmitter;
|
|
PeerManager.Connection = Connection;
|
|
|
|
PeerManager.prototype.start = function() {
|
|
this.active = true;
|
|
if(!this.timer) {
|
|
this.timer = setInterval(this.checkStatus.bind(this), this.interval);
|
|
}
|
|
};
|
|
|
|
PeerManager.prototype.stop = function() {
|
|
this.active = false;
|
|
if(this.timer) {
|
|
clearInterval(this.timer);
|
|
this.timer = null;
|
|
}
|
|
for(var i=0; i<this.connections.length; i++) {
|
|
this.connections[i].socket.end();
|
|
};
|
|
};
|
|
|
|
PeerManager.prototype.addPeer = function(peer, port) {
|
|
if(peer instanceof Peer) {
|
|
this.peers.push(peer);
|
|
} else if ("string" == typeof peer) {
|
|
this.addPeer(new Peer(peer, port));
|
|
} else {
|
|
log.err('Node.addPeer(): Invalid value provided for peer',
|
|
{val: peer});
|
|
throw 'Node.addPeer(): Invalid value provided for peer.';
|
|
}
|
|
};
|
|
|
|
PeerManager.prototype.removePeer = function(peer) {
|
|
var index = this.peers.indexOf(peer);
|
|
var exists = !!~index;
|
|
if (exists) this.peers.splice(index, 1);
|
|
return exists;
|
|
};
|
|
|
|
PeerManager.prototype.checkStatus = function checkStatus() {
|
|
// Make sure we are connected to all forcePeers
|
|
if(this.peers.length) {
|
|
var peerIndex = {};
|
|
this.peers.forEach(function(peer) {
|
|
peerIndex[peer.toString()] = peer;
|
|
});
|
|
|
|
// Ignore the ones we're already connected to
|
|
this.connections.forEach(function(conn) {
|
|
var peerName = conn.peer.toString();
|
|
if("undefined" !== peerIndex[peerName]) {
|
|
delete peerIndex[peerName];
|
|
}
|
|
});
|
|
|
|
// for debug purposes, print how many of our peers are actually connected
|
|
var connected = 0
|
|
this.peers.forEach(function(p) {
|
|
if (p.connection && !p.connection._connecting) connected++
|
|
});
|
|
log.info(connected + ' of ' + this.peers.length + ' peers connected');
|
|
|
|
Object.keys(peerIndex).forEach(function(i) {
|
|
this.connectTo(peerIndex[i]);
|
|
}.bind(this));
|
|
}
|
|
};
|
|
|
|
PeerManager.prototype.connectTo = function(peer) {
|
|
log.info('connecting to ' + peer);
|
|
try {
|
|
return this.addConnection(peer.createConnection(), peer);
|
|
} catch (e) {
|
|
log.err('creating connection',e);
|
|
return null;
|
|
}
|
|
};
|
|
|
|
PeerManager.prototype.addConnection = function(socketConn, peer) {
|
|
var conn = new Connection(socketConn, peer, this.config);
|
|
this.connections.push(conn);
|
|
this.emit('connection', conn);
|
|
|
|
conn.addListener('version', this.handleVersion.bind(this));
|
|
conn.addListener('verack', this.handleReady.bind(this));
|
|
conn.addListener('addr', this.handleAddr.bind(this));
|
|
conn.addListener('getaddr', this.handleGetAddr.bind(this));
|
|
conn.addListener('error', this.handleError.bind(this));
|
|
conn.addListener('disconnect', this.handleDisconnect.bind(this));
|
|
|
|
return conn;
|
|
};
|
|
|
|
PeerManager.prototype.handleVersion = function(e) {
|
|
e.peer.version = e.message.version;
|
|
e.peer.start_height = e.message.start_height;
|
|
|
|
if (!e.conn.inbound) {
|
|
// TODO: Advertise our address (if listening)
|
|
}
|
|
// Get recent addresses
|
|
if(this.peerDiscovery &&
|
|
(e.message.version >= 31402 || this.peers.length < 1000)) {
|
|
e.conn.sendGetAddr();
|
|
e.conn.getaddr = true;
|
|
}
|
|
};
|
|
|
|
PeerManager.prototype.handleReady = function (e) {
|
|
log.info('connected to '+e.conn.peer.host+':'+e.conn.peer.port);
|
|
this.emit('connect', {
|
|
pm: this,
|
|
conn: e.conn,
|
|
socket: e.socket,
|
|
peer: e.peer
|
|
});
|
|
|
|
if(this.isConnected == false) {
|
|
this.emit('netConnected', e);
|
|
this.isConnected = true;
|
|
}
|
|
};
|
|
|
|
PeerManager.prototype.handleAddr = function (e) {
|
|
if(!this.peerDiscovery) return;
|
|
|
|
var now = GetAdjustedTime();
|
|
e.message.addrs.forEach(function (addr) {
|
|
try {
|
|
// In case of an invalid time, assume "5 days ago"
|
|
if (addr.time <= 100000000 || addr.time > (now + 10 * 60)) {
|
|
addr.time = now - 5 * 24 * 60 * 60;
|
|
}
|
|
var peer = new Peer(addr.ip, addr.port, addr.services);
|
|
peer.lastSeen = addr.time;
|
|
|
|
// TODO: Handle duplicate peers
|
|
this.peers.push(peer);
|
|
|
|
// TODO: Handle addr relay
|
|
} catch(e) {
|
|
log.warn("Invalid addr received: "+e.message);
|
|
}
|
|
}.bind(this));
|
|
if (e.message.addrs.length < 1000 ) {
|
|
e.conn.getaddr = false;
|
|
}
|
|
};
|
|
|
|
PeerManager.prototype.handleGetAddr = function(e) {
|
|
// TODO: Reply with addr message.
|
|
};
|
|
|
|
PeerManager.prototype.handleError = function(e) {
|
|
log.err('unkown error with peer '+e.peer+' (disconnecting): '+e.err);
|
|
this.handleDisconnect.apply(this, [].slice.call(arguments));
|
|
};
|
|
|
|
PeerManager.prototype.handleDisconnect = function(e) {
|
|
log.info('disconnected from peer ' + e.peer);
|
|
var i = this.connections.indexOf(e.conn);
|
|
if(i != -1) this.connections.splice(i, 1);
|
|
|
|
this.removePeer(e.peer);
|
|
if (this.pool.length) {
|
|
log.info('replacing peer using the pool of ' + this.pool.length + ' seeds');
|
|
this.addPeer(this.pool.pop());
|
|
}
|
|
|
|
if(!this.connections.length) {
|
|
this.emit('netDisconnected');
|
|
this.isConnected = false;
|
|
}
|
|
};
|
|
|
|
PeerManager.prototype.getActiveConnection = function () {
|
|
var activeConnections = this.connections.filter(function (conn) {
|
|
return conn.active;
|
|
});
|
|
|
|
if (activeConnections.length) {
|
|
var randomIndex = Math.floor(Math.random()*activeConnections.length);
|
|
var candidate = activeConnections[randomIndex];
|
|
if (candidate.socket.writable) {
|
|
return candidate;
|
|
} else {
|
|
// Socket is not writable, remove it from active connections
|
|
activeConnections.splice(randomIndex, 1);
|
|
|
|
// Then try again
|
|
// TODO: This causes an infinite recursion when all connections are dead,
|
|
// although it shouldn't.
|
|
return this.getActiveConnection();
|
|
}
|
|
} else {
|
|
return null;
|
|
}
|
|
};
|
|
|
|
PeerManager.prototype.getActiveConnections = function () {
|
|
return this.connections.slice(0);
|
|
};
|
|
|
|
PeerManager.prototype.discover = function(options, callback) {
|
|
var self = this;
|
|
var async = imports.async || require('async');
|
|
var dns = imports.dns || require('dns');
|
|
var networks = imports.networks || require('../networks');
|
|
var seeds = networks[self.config.network].dnsSeeds;
|
|
|
|
self.limit = options.limit || 12;
|
|
|
|
var dnsExecutor = seeds.map(function(seed) {
|
|
return function(done) {
|
|
// have we already resolved this seed?
|
|
if (~self.seeds.resolved.indexOf(seed)) {
|
|
// if so, just pass back cached peer list
|
|
return done(null, self.seeds.results[seed]);
|
|
}
|
|
|
|
// has this seed failed to resolve?
|
|
if (~self.seeds.failed.indexOf(seed)) {
|
|
// if so, pass back empty results
|
|
return done(null, []);
|
|
}
|
|
|
|
log.info('resolving dns seed '+ seed);
|
|
|
|
dns.resolve(seed, function(err, peers) {
|
|
if (err) {
|
|
log.err('failed to resolve dns seed '+ seed, err);
|
|
self.seeds.failed.push(seed);
|
|
return done(null, []);
|
|
}
|
|
|
|
log.info('found '+ peers.length + ' peers from ' + seed);
|
|
self.seeds.resolved.push(seed);
|
|
|
|
// transform that list into a list of Peer instances
|
|
peers = peers.map(function(ip) {
|
|
return new Peer(ip, networks.defaultClientPort);
|
|
});
|
|
|
|
peers.forEach(function(p) {
|
|
if (self.peers.length < self.limit) self.addPeer(p);
|
|
else self.pool.push(p);
|
|
});
|
|
|
|
self.emit('peers', peers);
|
|
|
|
return done(null, peers);
|
|
});
|
|
|
|
};
|
|
});
|
|
|
|
// try resolving all seeds
|
|
async.parallel(dnsExecutor, function(err, results) {
|
|
var peers = [];
|
|
|
|
// consolidate all resolved peers into one list
|
|
results.forEach(function(peerlist) {
|
|
peers = peers.concat(peerlist);
|
|
});
|
|
|
|
if (typeof callback === 'function') callback(null, peers);
|
|
});
|
|
|
|
return self;
|
|
};
|
|
|
|
module.exports = require('soop')(PeerManager);
|