torrent: throw on use after destroy

lib/torrent.js

@@ -448,6 +448,7 @@ Torrent.prototype.destroy = function (cb) {
  */
 Torrent.prototype.addPeer = function (peer) {
   var self = this
+  if (self.destroyed) throw new Error('torrent is destroyed')
 
   function addPeer () {
     self.swarm.addPeer(peer)
@@ -472,9 +473,9 @@ Torrent.prototype.addPeer = function (peer) {
  * @param {string} url web seed url
  */
 Torrent.prototype.addWebSeed = function (url) {
-  var self = this
+  if (this.destroyed) throw new Error('torrent is destroyed')
   debug('add web seed %s', url)
-  self.swarm.addWebSeed(url, self)
+  this.swarm.addWebSeed(url, this)
 }
 
 /**
@@ -487,6 +488,8 @@ Torrent.prototype.addWebSeed = function (url) {
  */
 Torrent.prototype.select = function (start, end, priority, notify) {
   var self = this
+  if (self.destroyed) throw new Error('torrent is destroyed')
+
   if (start > end || start < 0 || end >= self.pieces.length) {
     throw new Error('invalid selection ', start, ':', end)
   }
@@ -518,6 +521,8 @@ Torrent.prototype.select = function (start, end, priority, notify) {
  */
 Torrent.prototype.deselect = function (start, end, priority) {
   var self = this
+  if (self.destroyed) throw new Error('torrent is destroyed')
+
   priority = Number(priority) || 0
   debug('deselect %s-%s (priority %s)', start, end, priority)
 
@@ -540,6 +545,8 @@ Torrent.prototype.deselect = function (start, end, priority) {
  */
 Torrent.prototype.critical = function (start, end) {
   var self = this
+  if (self.destroyed) throw new Error('torrent is destroyed')
+
   debug('critical %s-%s', start, end)
 
   for (var i = start; i <= end; ++i) {
@@ -1179,6 +1186,8 @@ Torrent.prototype._checkDone = function () {
 
 Torrent.prototype.load = function (streams, cb) {
   var self = this
+  if (self.destroyed) throw new Error('torrent is destroyed')
+
   if (!Array.isArray(streams)) streams = [ streams ]
   if (!cb) cb = noop
 
@@ -1198,10 +1207,11 @@ Torrent.prototype.load = function (streams, cb) {
 }
 
 Torrent.prototype.createServer = function (opts) {
-  var self = this
+  if (this.destroyed) throw new Error('torrent is destroyed')
+
   if (typeof Server !== 'function') throw new Error('node.js-only method')
-  var server = new Server(self, opts)
-  self._servers.push(server)
+  var server = new Server(this, opts)
+  this._servers.push(server)
   return server
 }