set dhtPort to correct port after listening

CHANGELOG.md

@@ -7,6 +7,9 @@
 - `client.listening` property to signal whether TCP server is listening for incoming
   connections.
 
+- `client.dhtPort` property reflects the actual DHT port when user doesn't specify one
+  (this is parallel to `client.torrentPort` for the TCP torrent listening server)
+
 ### Changed
 
 - Merged `Swarm` class into `Torrent` object. Properties on `torrent.swarm` (like

index.js

@@ -1,5 +1,4 @@
 // TODO: cleanup event listeners
-// TODO: set dhtPort to correct port
 
 module.exports = WebTorrent
 
@@ -70,6 +69,7 @@ function WebTorrent (opts) {
   self.destroyed = false
   self.listening = false
   self.torrentPort = opts.torrentPort || 0
+  self.dhtPort = opts.dhtPort || 0
   self.tracker = opts.tracker !== undefined ? opts.tracker : true
   self.torrents = []
   self.maxConns = Number(opts.maxConns) || 55
@@ -95,11 +95,15 @@ function WebTorrent (opts) {
     self.dht.once('error', function (err) {
       self._destroy(err)
     })
+    self.dht.once('listening', function () {
+      var address = self.dht.address()
+      if (address) self.dhtPort = address.port
+    })
 
     // Ignore warning when there are > 10 torrents in the client
     self.dht.setMaxListeners(0)
 
-    self.dht.listen(opts.dhtPort)
+    self.dht.listen(self.dhtPort)
   } else {
     self.dht = false
   }
@@ -387,7 +391,8 @@ WebTorrent.prototype._onListening = function () {
   if (this._tcpPool) {
     // Sometimes server.address() returns `null` in Docker.
     // WebTorrent issue: https://github.com/feross/bittorrent-swarm/pull/18
-    this.torrentPort = (this._tcpPool.server.address() || { port: 0 }).port
+    var address = this._tcpPool.server.address()
+    if (address) this.torrentPort = address.port
   }
 
   this.emit('listening')

test/node/download-dht-magnet.js

@@ -7,7 +7,7 @@ var test = require('tape')
 var WebTorrent = require('../../')
 
 test('Download using DHT (via magnet uri)', function (t) {
-  t.plan(11)
+  t.plan(12)
 
   var dhtServer = new DHT({ bootstrap: false })
 
@@ -27,6 +27,10 @@ test('Download using DHT (via magnet uri)', function (t) {
         dht: { bootstrap: '127.0.0.1:' + dhtServer.address().port, host: networkAddress.ipv4() }
       })
 
+      client1.dht.on('listening', function () {
+        t.equal(client1.dhtPort, client1.dht.address().port)
+      })
+
       client1.on('error', function (err) { t.fail(err) })
       client1.on('warning', function (err) { t.fail(err) })
 

test/node/download-dht-torrent.js

@@ -6,7 +6,7 @@ var test = require('tape')
 var WebTorrent = require('../../')
 
 test('Download using DHT (via .torrent file)', function (t) {
-  t.plan(8)
+  t.plan(9)
 
   var dhtServer = new DHT({ bootstrap: false })
 
@@ -26,6 +26,10 @@ test('Download using DHT (via .torrent file)', function (t) {
         dht: { bootstrap: '127.0.0.1:' + dhtServer.address().port }
       })
 
+      client1.dht.on('listening', function () {
+        t.equal(client1.dhtPort, client1.dht.address().port)
+      })
+
       client1.on('error', function (err) { t.fail(err) })
       client1.on('warning', function (err) { t.fail(err) })