Handle "alerts dropped" alert from libtorrent

src/base/bittorrent/session.cpp

@@ -3902,6 +3902,11 @@ void Session::handleAlert(const lt::alert *a)
         case lt::external_ip_alert::alert_type:
             handleExternalIPAlert(static_cast<const lt::external_ip_alert*>(a));
             break;
+#if (LIBTORRENT_VERSION_NUM >= 10200)
+        case lt::alerts_dropped_alert::alert_type:
+            handleAlertsDroppedAlert(static_cast<const lt::alerts_dropped_alert *>(a));
+            break;
+#endif
         }
     }
     catch (const std::exception &exc) {
@@ -4365,6 +4370,14 @@ void Session::handleSessionStatsAlert(const lt::session_stats_alert *p)
     emit statsUpdated();
 }
 
+#if (LIBTORRENT_VERSION_NUM >= 10200)
+void Session::handleAlertsDroppedAlert(const lt::alerts_dropped_alert *p) const
+{
+    LogMsg(tr("Error: Internal alert queue full and alerts were dropped, you might see degraded performance. Dropped alert types: %1. Message: %2")
+        .arg(QString::fromStdString(p->dropped_alerts.to_string()), QString::fromStdString(p->message())), Log::CRITICAL);
+}
+#endif
+
 void Session::handleStateUpdateAlert(const lt::state_update_alert *p)
 {
     QVector<BitTorrent::TorrentHandle *> updatedTorrents;

src/base/bittorrent/session.h

@@ -562,6 +562,9 @@ namespace BitTorrent
         void handleListenFailedAlert(const lt::listen_failed_alert *p);
         void handleExternalIPAlert(const lt::external_ip_alert *p);
         void handleSessionStatsAlert(const lt::session_stats_alert *p);
+#if (LIBTORRENT_VERSION_NUM >= 10200)
+        void handleAlertsDroppedAlert(const lt::alerts_dropped_alert *p) const;
+#endif
 
         void createTorrentHandle(const lt::torrent_handle &nativeHandle);