Address @DiegoRBaquero's feedback

From comment:
webtorrent#198 (comment)
95

Author: feross

lib/server/swarm.js

@@ -7,25 +7,27 @@ var randomIterate = require('random-iterate')
 // Regard this as the default implementation of an interface that you
 // need to support when overriding Server.createSwarm() and Server.getSwarm()
 function Swarm (infoHash, server) {
-  this.infoHash = infoHash
-  this.complete = 0
-  this.incomplete = 0
+  var self = this
+  self.infoHash = infoHash
+  self.complete = 0
+  self.incomplete = 0
 
-  this.peers = new LRU({
+  self.peers = new LRU({
     max: server.peersCacheLength || 1000,
     maxAge: server.peersCacheTtl || 20 * 60 * 1000 // 20 minutes
   })
 
   // When a peer is evicted from the LRU store, send a synthetic 'stopped' event
   // so the stats get updated correctly.
-  this.peers.on('evict', function (data) {
+  self.peers.on('evict', function (data) {
     var peer = data.value
-    this.announce({
+    var params = {
       type: peer.type,
       event: 'stopped',
       numwant: 0,
       peer_id: peer.peerId
-    }, noop)
+    }
+    self._onAnnounceStopped(params, peer, peer.peerId)
 
     // When a websocket peer is evicted, and it's not in any other swarms, close
     // the websocket to conserve server resources.
@@ -151,5 +153,3 @@ Swarm.prototype._getPeers = function (numwant, ownPeerId, isWebRTC) {
   }
   return peers
 }
-
-function noop () {}