added a seedlist class and example for connecting over tor

SeedList.js

@@ -0,0 +1,47 @@
+'use strict';
+var imports      = require('soop').imports();
+var parent       = imports.parent || require('events').EventEmitter;
+var EventEmitter = require('events').EventEmitter;
+var dns          = require('dns');
+var inherits     = require('util').inherits;
+
+function SeedList(options) {
+  this.options = options || {};
+  this.sources = [
+    'dnsseed.bluematt.me',
+    'dnsseed.bitcoin.dashjr.org',
+    'seed.bitcoin.sipa.be',
+    'seed.bitcoinstats.com',
+    'bitseed.xf2.org'
+  ];
+  this.source  = this.options.source || this.sources[0];
+  this.seeds   = [];
+  this.find()
+};
+
+inherits(SeedList, EventEmitter);
+
+SeedList.prototype.find = function() {
+  var self = this;
+  dns.resolve(self.source, function(err, seeds) {
+    if (err) {
+      var index = self.sources.indexOf(self.source);
+      if (index !== -1) {
+        index++;
+        if (!self.sources[index]) {
+          return self.emit('seedsNotFound');
+        }
+        else {
+          self.source = self.sources[index];
+        }
+        self.find();
+      }
+      return self.emit('error', err);
+    }
+    self.seeds = self.seeds.concat(seeds);
+    self.emit('seedsFound', seeds);
+  });
+  return self;
+};
+
+module.exports = require('soop')(SeedList);

config.js

@@ -1,4 +1,4 @@
 module.exports = {
   network: 'livenet',
-  logger: 'normal' // none, normal, debug
+  logger: 'debug' // none, normal, debug
 };

examples/TorProxy.js

@@ -0,0 +1,33 @@
+var Socks5Client = require('socks5-client');
+var Peer         = require('../Peer');
+var Connection   = require('../Connection');
+var SeedList     = require('../SeedList')
+
+// start looking for a seed
+var seedlist     = new SeedList();
+// create a client socket proxied through
+// tor's socks5 proxy
+var client       = new Socks5Client('127.0.0.1', 9050);
+
+// when we have a list of seeds...
+seedlist.on('seedsFound', function(seeds) {
+  // use the first seed in list
+  var peer       = new Peer(seeds[0], 8333);
+  var connection = new Connection(client, peer);
+  // open the connection to the seed
+  client.connect(peer.port, peer.host);
+  // always handle errors
+  connection.on('error', function(err) {
+    console.log(err);
+  });
+});
+
+// failboat
+seedlist.on('seedsNotFound', function() {
+  console.log('failed to find seeds :(');
+});
+
+// double failboat
+seedlist.on('error', function(err) {
+  console.log('error:', err);
+});