client: destroy callback isn't called until after cleanup

client.js

@@ -4,6 +4,7 @@ var debug = require('debug')('bittorrent-tracker')
 var EventEmitter = require('events').EventEmitter
 var inherits = require('inherits')
 var once = require('once')
+var parallel = require('run-parallel')
 var url = require('url')
 
 var common = require('./lib/common')
@@ -46,8 +47,10 @@ function Client (peerId, port, torrent, opts) {
   self._infoHashHex = self._infoHash.toString('hex')
   self._infoHashBinary = self._infoHash.toString('binary')
 
-  self._port = port
   self.torrentLength = torrent.length
+  self.destroyed = false
+
+  self._port = port
 
   self._rtcConfig = opts.rtcConfig
   self._wrtc = opts.wrtc
@@ -236,14 +239,19 @@ Client.prototype.setInterval = function (intervalMs) {
 
 Client.prototype.destroy = function (cb) {
   var self = this
+  if (self.destroyed) return
+  self.destroyed = true
   debug('destroy')
 
-  self._trackers.forEach(function (tracker) {
-    tracker.destroy()
-    tracker.setInterval(0) // stop announcing on intervals
+  var tasks = self._trackers.map(function (tracker) {
+    return function (cb) {
+      tracker.destroy(cb)
+      tracker.setInterval(0) // stop announcing on intervals
+    }
   })
+
+  parallel(tasks, cb)
   self._trackers = []
-  if (cb) process.nextTick(function () { cb(null) })
 }
 
 Client.prototype._defaultAnnounceOpts = function (opts) {

lib/http-tracker.js

@@ -88,9 +88,11 @@ HTTPTracker.prototype.setInterval = function (intervalMs) {
   }
 }
 
-HTTPTracker.prototype.destroy = function () {
+HTTPTracker.prototype.destroy = function (cb) {
   var self = this
+  if (self.destroyed) return
   self.destroyed = true
+  cb(null)
 }
 
 HTTPTracker.prototype._request = function (requestUrl, opts, cb) {

lib/udp-tracker.js

@@ -63,7 +63,7 @@ UDPTracker.prototype.setInterval = function (intervalMs) {
   }
 }
 
-UDPTracker.prototype.destroy = function () {
+UDPTracker.prototype.destroy = function (cb) {
   var self = this
   if (self.destroyed) return
   self.destroyed = true
@@ -72,6 +72,7 @@ UDPTracker.prototype.destroy = function () {
     cleanup()
   })
   self._cleanupFns = []
+  cb(null)
 }
 
 UDPTracker.prototype._request = function (opts) {

lib/websocket-tracker.js

@@ -87,7 +87,7 @@ WebSocketTracker.prototype.setInterval = function (intervalMs) {
   }
 }
 
-WebSocketTracker.prototype.destroy = function () {
+WebSocketTracker.prototype.destroy = function (onclose) {
   var self = this
   if (self.destroyed) return
   self.destroyed = true
@@ -95,12 +95,18 @@ WebSocketTracker.prototype.destroy = function () {
   self._socket.removeListener('data', self._onSocketDataBound)
   self._socket.removeListener('close', self._onSocketCloseBound)
   self._socket.removeListener('error', self._onSocketErrorBound)
+
   self._onSocketErrorBound = null
   self._onSocketDataBound = null
   self._onSocketCloseBound = null
 
   self._socket.on('error', noop) // ignore all future errors
-  try { self._socket.close() } catch (e) {}
+  try {
+    self._socket.destroy(onclose)
+  } catch (err) {
+    if (onclose) onclose()
+  }
+
   self._socket = null
 }
 

package.json

@@ -31,6 +31,7 @@
     "minimist": "^1.1.1",
     "once": "^1.3.0",
     "random-iterate": "^1.0.1",
+    "run-parallel": "^1.1.2",
     "run-series": "^1.0.2",
     "simple-get": "^1.3.0",
     "simple-peer": "^5.0.0",