Merge pull request #9257 from Chocobo1/prio

Avoid potentially setting the wrong piece priorities

src/base/bittorrent/session.cpp

@@ -2122,17 +2122,12 @@ bool Session::addTorrent_impl(CreateTorrentParams params, const MagnetUri &magne
         }
     }
 
+    // If empty then Automatic mode, otherwise Manual mode
+    QString savePath = params.savePath.isEmpty() ? categorySavePath(params.category) : params.savePath;
     libt::add_torrent_params p;
     InfoHash hash;
-    std::vector<boost::uint8_t> filePriorities;
+    const bool fromMagnetUri = magnetUri.isValid();
 
-    QString savePath;
-    if (params.savePath.isEmpty()) // using Automatic mode
-        savePath = categorySavePath(params.category);
-    else  // using Manual mode
-        savePath = params.savePath;
-
-    bool fromMagnetUri = magnetUri.isValid();
     if (fromMagnetUri) {
         hash = magnetUri.hash();
 
@@ -2195,9 +2190,7 @@ bool Session::addTorrent_impl(CreateTorrentParams params, const MagnetUri &magne
         p.flags |= libt::add_torrent_params::flag_use_resume_save_path;
     }
     else {
-        foreach (int prio, params.filePriorities)
-            filePriorities.push_back(prio);
-        p.file_priorities = filePriorities;
+        p.file_priorities = {params.filePriorities.begin(), params.filePriorities.end()};
     }
 
     // We should not add torrent if it already

src/base/bittorrent/torrenthandle.cpp

@@ -1300,13 +1300,21 @@ void TorrentHandle::toggleSequentialDownload()
 
 void TorrentHandle::setFirstLastPiecePriority(const bool enabled)
 {
+    setFirstLastPiecePriorityImpl(enabled);
+}
+
+void TorrentHandle::setFirstLastPiecePriorityImpl(const bool enabled, const QVector<int> &updatedFilePrio)
+{
+    // Download first and last pieces first for every file in the torrent
+
     if (!hasMetadata()) {
         m_needsToSetFirstLastPiecePriority = enabled;
         return;
     }
 
-    // Download first and last pieces first for every file in the torrent
-    const std::vector<int> filePriorities = nativeHandle().file_priorities();
+    // Updating file priorities is an async operation in libtorrent, when we just updated it and immediately query it
+    // we might get the old/wrong values, so we rely on `updatedFilePrio` in this case.
+    const std::vector<int> filePriorities = !updatedFilePrio.isEmpty() ? updatedFilePrio.toStdVector() : nativeHandle().file_priorities();
     std::vector<int> piecePriorities = nativeHandle().piece_priorities();
     for (int index = 0; index < static_cast<int>(filePriorities.size()); ++index) {
         const int filePrio = filePriorities[index];
@@ -1991,7 +1999,7 @@ void TorrentHandle::prioritizeFiles(const QVector<int> &priorities)
     if (priorities.size() != filesCount()) return;
 
     // Save first/last piece first option state
-    bool firstLastPieceFirst = hasFirstLastPiecePriority();
+    const bool firstLastPieceFirst = hasFirstLastPiecePriority();
 
     // Reset 'm_hasSeedStatus' if needed in order to react again to
     // 'torrent_finished_alert' and eg show tray notifications
@@ -2064,7 +2072,7 @@ void TorrentHandle::prioritizeFiles(const QVector<int> &priorities)
 
     // Restore first/last piece first option if necessary
     if (firstLastPieceFirst)
-        setFirstLastPiecePriority(true);
+        setFirstLastPiecePriorityImpl(true, priorities);
 
     updateStatus();
 }

src/base/bittorrent/torrenthandle.h

@@ -420,6 +420,7 @@ namespace BitTorrent
         bool addTracker(const TrackerEntry &tracker);
         bool addUrlSeed(const QUrl &urlSeed);
         bool removeUrlSeed(const QUrl &urlSeed);
+        void setFirstLastPiecePriorityImpl(bool enabled, const QVector<int> &updatedFilePrio = {});
 
         Session *const m_session;
         libtorrent::torrent_handle m_nativeHandle;

src/base/torrentfilter.cpp

@@ -138,14 +138,14 @@ bool TorrentFilter::setTag(const QString &tag)
     return false;
 }
 
-bool TorrentFilter::match(TorrentHandle *const torrent) const
+bool TorrentFilter::match(const TorrentHandle *const torrent) const
 {
     if (!torrent) return false;
 
     return (matchState(torrent) && matchHash(torrent) && matchCategory(torrent) && matchTag(torrent));
 }
 
-bool TorrentFilter::matchState(BitTorrent::TorrentHandle *const torrent) const
+bool TorrentFilter::matchState(const BitTorrent::TorrentHandle *const torrent) const
 {
     switch (m_type) {
     case All:
@@ -171,19 +171,19 @@ bool TorrentFilter::matchState(BitTorrent::TorrentHandle *const torrent) const
     }
 }
 
-bool TorrentFilter::matchHash(BitTorrent::TorrentHandle *const torrent) const
+bool TorrentFilter::matchHash(const BitTorrent::TorrentHandle *const torrent) const
 {
     if (m_hashSet == AnyHash) return true;
     else return m_hashSet.contains(torrent->hash());
 }
 
-bool TorrentFilter::matchCategory(BitTorrent::TorrentHandle *const torrent) const
+bool TorrentFilter::matchCategory(const BitTorrent::TorrentHandle *const torrent) const
 {
     if (m_category.isNull()) return true;
     else return (torrent->belongsToCategory(m_category));
 }
 
-bool TorrentFilter::matchTag(BitTorrent::TorrentHandle *const torrent) const
+bool TorrentFilter::matchTag(const BitTorrent::TorrentHandle *const torrent) const
 {
     // Empty tag is a special value to indicate we're filtering for untagged torrents.
     if (m_tag.isNull()) return true;

src/base/torrentfilter.h

@@ -81,13 +81,13 @@ public:
     bool setCategory(const QString &category);
     bool setTag(const QString &tag);
 
-    bool match(BitTorrent::TorrentHandle *const torrent) const;
+    bool match(const BitTorrent::TorrentHandle *torrent) const;
 
 private:
-    bool matchState(BitTorrent::TorrentHandle *const torrent) const;
-    bool matchHash(BitTorrent::TorrentHandle *const torrent) const;
-    bool matchCategory(BitTorrent::TorrentHandle *const torrent) const;
-    bool matchTag(BitTorrent::TorrentHandle *const torrent) const;
+    bool matchState(const BitTorrent::TorrentHandle *torrent) const;
+    bool matchHash(const BitTorrent::TorrentHandle *torrent) const;
+    bool matchCategory(const BitTorrent::TorrentHandle *torrent) const;
+    bool matchTag(const BitTorrent::TorrentHandle *torrent) const;
 
     Type m_type;
     QString m_category;