From cd6959b712872407376b1cbd5bcc41daa4650d76 Mon Sep 17 00:00:00 2001
From: "Vladimir Golovnev (Glassez)" <glassez@yandex.ru>
Date: Mon, 29 Mar 2021 11:26:44 +0300
Subject: [PATCH] Save "resume data" once file priority is changed

---
 src/base/bittorrent/session.cpp     |  3 +++
 src/base/bittorrent/torrentimpl.cpp | 13 +++++++++++++
 src/base/bittorrent/torrentimpl.h   | 14 ++++++++++++++
 3 files changed, 30 insertions(+)

diff --git a/src/base/bittorrent/session.cpp b/src/base/bittorrent/session.cpp
index 77b76dd9f..7229695c6 100644
--- a/src/base/bittorrent/session.cpp
+++ b/src/base/bittorrent/session.cpp
@@ -4257,6 +4257,9 @@ void Session::handleAlert(const lt::alert *a)
     {
         switch (a->type())
         {
+#if (LIBTORRENT_VERSION_NUM >= 20003)
+        case lt::file_prio_alert::alert_type:
+#endif
         case lt::file_renamed_alert::alert_type:
         case lt::file_completed_alert::alert_type:
         case lt::torrent_finished_alert::alert_type:
diff --git a/src/base/bittorrent/torrentimpl.cpp b/src/base/bittorrent/torrentimpl.cpp
index ce2c16f12..fd26985f5 100644
--- a/src/base/bittorrent/torrentimpl.cpp
+++ b/src/base/bittorrent/torrentimpl.cpp
@@ -1876,6 +1876,14 @@ void TorrentImpl::handleFileCompletedAlert(const lt::file_completed_alert *p)
     }
 }
 
+#if (LIBTORRENT_VERSION_NUM >= 20003)
+void TorrentImpl::handleFilePrioAlert(const lt::file_prio_alert *p)
+{
+    if (m_nativeHandle.need_save_resume_data())
+        m_session->handleTorrentNeedSaveResumeData(this);
+}
+#endif
+
 void TorrentImpl::handleMetadataReceivedAlert(const lt::metadata_received_alert *p)
 {
     Q_UNUSED(p);
@@ -1913,6 +1921,11 @@ void TorrentImpl::handleAlert(const lt::alert *a)
 {
     switch (a->type())
     {
+#if (LIBTORRENT_VERSION_NUM >= 20003)
+    case lt::file_prio_alert::alert_type:
+        handleFilePrioAlert(static_cast<const lt::file_prio_alert*>(a));
+        break;
+#endif
     case lt::file_renamed_alert::alert_type:
         handleFileRenamedAlert(static_cast<const lt::file_renamed_alert*>(a));
         break;
diff --git a/src/base/bittorrent/torrentimpl.h b/src/base/bittorrent/torrentimpl.h
index 5b49b7d7b..bc4232677 100644
--- a/src/base/bittorrent/torrentimpl.h
+++ b/src/base/bittorrent/torrentimpl.h
@@ -49,6 +49,17 @@
 #include "torrent.h"
 #include "torrentinfo.h"
 
+#if (LIBTORRENT_VERSION_NUM == 20003)
+// file_prio_alert is missing to be forward declared in "libtorrent/fwd.hpp"
+namespace libtorrent
+{
+    inline namespace v2
+    {
+        struct file_prio_alert;
+    }
+}
+#endif
+
 namespace BitTorrent
 {
     class Session;
@@ -244,6 +255,9 @@ namespace BitTorrent
 
         void handleFastResumeRejectedAlert(const lt::fastresume_rejected_alert *p);
         void handleFileCompletedAlert(const lt::file_completed_alert *p);
+#if (LIBTORRENT_VERSION_NUM >= 20003)
+        void handleFilePrioAlert(const lt::file_prio_alert *p);
+#endif
         void handleFileRenamedAlert(const lt::file_renamed_alert *p);
         void handleFileRenameFailedAlert(const lt::file_rename_failed_alert *p);
         void handleMetadataReceivedAlert(const lt::metadata_received_alert *p);