fix queue overload for add torrent at session start

src/base/bittorrent/session.cpp

@@ -1039,6 +1039,11 @@ void Session::configure(libtorrent::settings_pack &settingsPack)
     settingsPack.set_int(libt::settings_pack::active_tracker_limit, -1);
     settingsPack.set_int(libt::settings_pack::active_dht_limit, -1);
     settingsPack.set_int(libt::settings_pack::active_lsd_limit, -1);
+    // 1 active torrent force 2 connections. If you have more active torrents * 2 than connection limit,
+    // connection limit will get extended. Multiply max connections or active torrents by 10 for queue.
+    // Ignore -1 values because we don't want to set a max int message queue
+    settingsPack.set_int(libt::settings_pack::alert_queue_size, std::max(1000,
+        10 * std::max(maxActiveTorrents() * 2, maxConnections())));
 
     // Outgoing ports
     settingsPack.set_int(libt::settings_pack::outgoing_port, outgoingPortsMin());
@@ -1180,6 +1185,11 @@ void Session::configure(libtorrent::session_settings &sessionSettings)
     sessionSettings.active_tracker_limit = -1;
     sessionSettings.active_dht_limit = -1;
     sessionSettings.active_lsd_limit = -1;
+    // 1 active torrent force 2 connections. If you have more active torrents * 2 than connection limit,
+    // connection limit will get extended. Multiply max connections or active torrents by 10 for queue.
+    // Ignore -1 values because we don't want to set a max int message queue
+    sessionSettings.alert_queue_size = std::max(1000,
+        10 * std::max(maxActiveTorrents() * 2, maxConnections()));
 
     // Outgoing ports
     sessionSettings.outgoing_ports = std::make_pair(outgoingPortsMin(), outgoingPortsMax());
@@ -3044,13 +3054,19 @@ void Session::startUpTorrents()
         QByteArray data;
     } TorrentResumeData;
 
-    auto startupTorrent = [this, logger, resumeDataDir](const TorrentResumeData &params)
+    int resumedTorrentsCount = 0;
+    const auto startupTorrent = [this, logger, &resumeDataDir, &resumedTorrentsCount](const TorrentResumeData &params)
     {
         QString filePath = resumeDataDir.filePath(QString("%1.torrent").arg(params.hash));
         qDebug() << "Starting up torrent" << params.hash << "...";
         if (!addTorrent_impl(params.addTorrentData, params.magnetUri, TorrentInfo::loadFromFile(filePath), params.data))
             logger->addMessage(tr("Unable to resume torrent '%1'.", "e.g: Unable to resume torrent 'hash'.")
                                .arg(params.hash), Log::CRITICAL);
+
+        // process add torrent messages before message queue overflow
+        if (resumedTorrentsCount % 100 == 0) readAlerts();
+
+        ++resumedTorrentsCount;
     };
 
     qDebug("Starting up torrents");