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simplified example for peer discovery, added some debug output to discoverPeers(), made Peer reference the connection created from createConnection()

This commit is contained in:
Gordon Hall 2014-04-19 15:12:44 -04:00
parent 76247ff532
commit e82867007e
3 changed files with 16 additions and 17 deletions
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10
examples/PeerDiscovery.js
View File

@ -2,14 +2,10 @@ var PeerManager = require('../lib/PeerManager');
var peerman = new PeerManager(); var peerman = new PeerManager();
peerman.discoverPeers(function(err, peers) { peerman.discoverPeers(function(err, peers) {
// we get an array of peer instances
console.log(peers);
// the peer manager caches the tried seeds and any results
console.log(peerman.seeds);
// we can use this array of peers to add to the manager // we can use this array of peers to add to the manager
peers.forEach(function(p) { // but let's limit it to 6 connections for this example
peerman.addPeer(p); var p = 0;
}); do { peerman.addPeer(peers[p]); p++; } while (p <= 6);
// then we can start the manager // then we can start the manager
peerman.start(); peerman.start();
}); });

4
lib/Peer.js
View File

@ -34,8 +34,8 @@ function Peer(host, port, services) {
Peer.IPV6_IPV4_PADDING = new Buffer([0,0,0,0,0,0,0,0,0,0,255,255]); Peer.IPV6_IPV4_PADDING = new Buffer([0,0,0,0,0,0,0,0,0,0,255,255]);
Peer.prototype.createConnection = function () { Peer.prototype.createConnection = function () {
var c = Net.createConnection(this.port, this.host); this.connection = Net.createConnection(this.port, this.host);
return c; return this.connection;
}; };
Peer.prototype.getHostAsBuffer = function () { Peer.prototype.getHostAsBuffer = function () {

19
lib/PeerManager.js
View File

@ -26,6 +26,13 @@ function PeerManager(config) {
this.interval = 5000; this.interval = 5000;
this.minConnections = 8; this.minConnections = 8;
this.minKnownPeers = 10; this.minKnownPeers = 10;
// keep track of tried seeds and results
this.seeds = {
resolved: [],
failed: [],
results: {}
};
} }
PeerManager.parent = imports.parent || require('events').EventEmitter; PeerManager.parent = imports.parent || require('events').EventEmitter;
@ -219,13 +226,6 @@ PeerManager.prototype.discoverPeers = function(callback) {
var networks = imports.networks || require('../networks')[this.config.network]; var networks = imports.networks || require('../networks')[this.config.network];
var seeds = networks.dnsSeeds; var seeds = networks.dnsSeeds;
// keep track of tried seeds and results
self.seeds = {
resolved: [],
failed: [],
results: {}
};
var dnsExecutor = seeds.map(function(seed) { var dnsExecutor = seeds.map(function(seed) {
return function(done) { return function(done) {
// have we already resolved this seed? // have we already resolved this seed?
@ -234,16 +234,19 @@ PeerManager.prototype.discoverPeers = function(callback) {
return done(null, self.seeds.results[seed]); return done(null, self.seeds.results[seed]);
} }
// has this seed failed to resolve? // has this seed failed to resolve?
if (~self.seeds.resolved.indexOf(seed)) { if (~self.seeds.failed.indexOf(seed)) {
// if so, pass back empty results // if so, pass back empty results
return done(null, []); return done(null, []);
} }
// otherwise resolve the dns seed to get some peers // otherwise resolve the dns seed to get some peers
log.info('resolving dns seed '+ seed);
dns.resolve(seed, function(err, peers) { dns.resolve(seed, function(err, peers) {
if (err) { if (err) {
log.err('failed to resolve dns seed '+ seed, err);
self.seeds.failed.push(seed); self.seeds.failed.push(seed);
return done(null, []); return done(null, []);
} }
log.info('found '+ peers.length + ' peers from ' + seed);
self.seeds.resolved.push(seed); self.seeds.resolved.push(seed);
self.seeds.results[seed] = peers; self.seeds.results[seed] = peers;
return done(null, peers); return done(null, peers);