add support for peer discovery to PeerManager and example of usage to examples/
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@ -213,4 +213,61 @@ PeerManager.prototype.getActiveConnections = function () {
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return this.connections.slice(0);
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};
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PeerManager.prototype.discoverPeers = function(callback) {
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var self = this;
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var async = imports.async || require('async');
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var dns = imports.dns || require('dns');
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var networks = imports.networks || require('./networks')[this.config.network];
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var seeds = networks.dnsSeeds;
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// keep track of tried seeds and results
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self.seeds = {
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resolved: [],
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failed: [],
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results: {}
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};
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var dnsExecutor = seeds.map(function(seed) {
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return function(done) {
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// have we already resolved this seed?
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if (~self.seeds.resolved.indexOf(seed)) {
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// if so, just pass back cached peer list
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return done(null, self.seeds.results[seed]);
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}
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// has this seed failed to resolve?
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if (~self.seeds.resolved.indexOf(seed)) {
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// if so, pass back empty results
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return done(null, []);
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}
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// otherwise resolve the dns seed to get some peers
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dns.resolve(seed, function(err, peers) {
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if (err) {
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self.seeds.failed.push(seed);
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return done(null, []);
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}
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self.seeds.resolved.push(seed);
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self.seeds.results[seed] = peers;
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return done(null, peers);
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});
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};
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});
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// try resolving all seeds
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async.parallel(dnsExecutor, function(err, results) {
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var peers = [];
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// consolidate all resolved peers into one list
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results.forEach(function(peerlist) {
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peers = peers.concat(peerlist);
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});
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// transform that list into a list of Peer instances
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peers = peers.map(function(ip) {
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return new Peer(ip, networks.defaultClientPort);
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});
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callback(null, peers);
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});
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};
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module.exports = require('soop')(PeerManager);
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@ -0,0 +1,15 @@
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var PeerManager = require('../PeerManager');
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var peerman = new PeerManager();
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peerman.discoverPeers(function(err, peers) {
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// we get an array of peer instances
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console.log(peers);
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// the peer manager caches the tried seeds and any results
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console.log(peerman.seeds);
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// we can use this array of peers to add to the manager
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peers.forEach(function(p) {
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peerman.addPeer(p);
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});
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// then we can start the manager
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peerman.start();
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});
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18
networks.js
18
networks.js
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@ -19,7 +19,16 @@ exports.livenet = {
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prev_hash: buffertools.fill(new Buffer(32), 0),
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timestamp: 1231006505,
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bits: 486604799,
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}
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},
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dnsSeeds: [
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'seed.bitcoin.sipa.be',
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'dnsseed.bluematt.me',
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'dnsseed.bitcoin.dashjr.org',
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'seed.bitcoinstats.com',
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'seed.bitnodes.io',
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'bitseed.xf2.org'
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],
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defaultClientPort: 8333
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};
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exports.testnet = {
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@ -39,5 +48,10 @@ exports.testnet = {
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prev_hash: buffertools.fill(new Buffer(32), 0),
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timestamp: 1296688602,
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bits: 486604799,
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}
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},
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dnsSeeds: [
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'testnet-seed.bitcoin.petertodd.org',
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'testnet-seed.bluematt.me'
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],
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defaultClientPort: 18333
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};
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