fix exception in websocket tracker

Author: feross

lib/http-tracker.js

@@ -44,6 +44,7 @@ function HTTPTracker (client, announceUrl, opts) {
 
 HTTPTracker.prototype.announce = function (opts) {
   var self = this
+  if (self.destroyed) return
   if (self._trackerId) opts.trackerid = self._trackerId
 
   if (opts.compact == null) opts.compact = 1
@@ -58,6 +59,7 @@ HTTPTracker.prototype.announce = function (opts) {
 
 HTTPTracker.prototype.scrape = function (opts) {
   var self = this
+  if (self.destroyed) return
 
   if (!self._scrapeUrl) {
     self.client.emit('error', new Error('scrape not supported ' + self._announceUrl))

lib/udp-tracker.js

@@ -39,11 +39,13 @@ function UDPTracker (client, announceUrl, opts) {
 
 UDPTracker.prototype.announce = function (opts) {
   var self = this
+  if (self.destroyed) return
   self._request(opts)
 }
 
 UDPTracker.prototype.scrape = function (opts) {
   var self = this
+  if (self.destroyed) return
   opts._scrape = true
   self._request(opts) // udp scrape uses same announce url
 }

lib/websocket-tracker.js

@@ -46,6 +46,7 @@ function WebSocketTracker (client, announceUrl, opts) {
 
 WebSocketTracker.prototype.announce = function (opts) {
   var self = this
+  if (self.destroyed) return
   if (!self._socket.connected) {
     return self._socket.once('connect', self.announce.bind(self, opts))
   }
@@ -69,6 +70,7 @@ WebSocketTracker.prototype.announce = function (opts) {
 
 WebSocketTracker.prototype.scrape = function (opts) {
   var self = this
+  if (self.destroyed) return
   self._onSocketError(new Error('scrape not supported ' + self._announceUrl))
 }