Purge peers that have not announced for twice the announce interval

http/announce.go

@@ -91,7 +91,7 @@ func (t *Tracker) ServeAnnounce(w http.ResponseWriter, r *http.Request, p httpro
 		if err != nil {
 			return http.StatusInternalServerError, err
 		}
-	} else if torrent.PeerCount() == 0 {
+	} else if t.cfg.PurgeInactiveTorrents && torrent.PeerCount() == 0 {
 		// Rather than deleting the torrent explicitly, let the tracker driver
 		// ensure there are no race conditions.
 		conn.PurgeInactiveTorrent(torrent.Infohash)

http/http.go

@@ -99,6 +99,13 @@ func Serve(cfg *config.Config) {
 		glog.Fatal("New: ", err)
 	}
 
+	go tracker.PurgeInactivePeers(
+		t.pool,
+		cfg.PurgeInactiveTorrents,
+		cfg.Announce.Duration*2,
+		cfg.Announce.Duration,
+	)
+
 	glog.V(0).Info("Starting on ", cfg.Addr)
 	graceful.Run(cfg.Addr, cfg.RequestTimeout.Duration, NewRouter(t, cfg))
 }