Allow control of cache expiry interval (libtorrent 0.16.10 allocator can now return cache to kernel)

src/preferences/advancedsettings.h

@@ -13,7 +13,11 @@
 #include "preferences.h"
 
 enum AdvSettingsCols {PROPERTY, VALUE};
-enum AdvSettingsRows {DISK_CACHE, OUTGOING_PORT_MIN, OUTGOING_PORT_MAX, IGNORE_LIMIT_LAN, RECHECK_COMPLETED, LIST_REFRESH, RESOLVE_COUNTRIES, RESOLVE_HOSTS, MAX_HALF_OPEN, SUPER_SEEDING, NETWORK_IFACE, NETWORK_ADDRESS, PROGRAM_NOTIFICATIONS, TRACKER_STATUS, TRACKER_PORT,
+enum AdvSettingsRows {DISK_CACHE,
+                    #if LIBTORRENT_VERSION_NUM >= 001610
+                      DISK_CACHE_TTL,
+                    #endif
+                      OUTGOING_PORT_MIN, OUTGOING_PORT_MAX, IGNORE_LIMIT_LAN, RECHECK_COMPLETED, LIST_REFRESH, RESOLVE_COUNTRIES, RESOLVE_HOSTS, MAX_HALF_OPEN, SUPER_SEEDING, NETWORK_IFACE, NETWORK_ADDRESS, PROGRAM_NOTIFICATIONS, TRACKER_STATUS, TRACKER_PORT,
                     #if defined(Q_WS_WIN) || defined(Q_WS_MAC)
                       UPDATE_CHECK,
                     #endif
@@ -33,6 +37,9 @@ private:
   cb_super_seeding, cb_program_notifications, cb_tracker_status, cb_confirm_torrent_deletion,
   cb_enable_tracker_ext;
   QComboBox combo_iface;
+#if LIBTORRENT_VERSION_NUM >= 001610
+  QSpinBox spin_cache_ttl;
+#endif
 #if defined(Q_WS_WIN) || defined(Q_WS_MAC)
   QCheckBox cb_update_check;
 #endif
@@ -69,6 +76,9 @@ public slots:
     Preferences pref;
     // Disk write cache
     pref.setDiskCacheSize(spin_cache.value());
+#if LIBTORRENT_VERSION_NUM >= 001610
+    pref.setDiskCacheTTL(spin_cache_ttl.value());
+#endif
     // Outgoing ports
     pref.setOutgoingPortsMin(outgoing_ports_min.value());
     pref.setOutgoingPortsMax(outgoing_ports_max.value());
@@ -172,6 +182,14 @@ private slots:
     spin_cache.setValue(pref.diskCacheSize());
     updateCacheSpinSuffix(spin_cache.value());
     setRow(DISK_CACHE, tr("Disk write cache size"), &spin_cache);
+#if LIBTORRENT_VERSION_NUM >= 001610
+    // Disk cache expiry
+    spin_cache_ttl.setMinimum(15);
+    spin_cache_ttl.setMaximum(600);
+    spin_cache_ttl.setValue(pref.diskCacheTTL());
+    spin_cache_ttl.setSuffix(tr(" s", " seconds"));
+    setRow(DISK_CACHE_TTL, tr("Disk cache expiry interval"), &spin_cache_ttl);
+#endif
     // Outgoing port Min
     outgoing_ports_min.setMinimum(0);
     outgoing_ports_min.setMaximum(65535);

src/preferences/preferences.h

@@ -959,13 +959,27 @@ public:
   }
 
   uint diskCacheSize() const {
+#if LIBTORRENT_VERSION_NUM >= 001610
     return value(QString::fromUtf8("Preferences/Downloads/DiskWriteCacheSize"), 0).toUInt();
+#else
+    return value(QString::fromUtf8("Preferences/Downloads/DiskWriteCacheSize"), 128).toUInt();
+#endif
   }
 
   void setDiskCacheSize(uint size) {
     setValue(QString::fromUtf8("Preferences/Downloads/DiskWriteCacheSize"), size);
   }
 
+#if LIBTORRENT_VERSION_NUM >= 001610
+  uint diskCacheTTL() const {
+    return value(QString::fromUtf8("Preferences/Downloads/DiskWriteCacheTTL"), 60).toUInt();
+  }
+
+  void setDiskCacheTTL(uint ttl) {
+    setValue(QString::fromUtf8("Preferences/Downloads/DiskWriteCacheTTL"), ttl);
+  }
+#endif
+
   uint outgoingPortsMin() const {
     return value(QString::fromUtf8("Preferences/Advanced/OutgoingPortsMin"), 0).toUInt();
   }

src/qtlibtorrent/qbtsession.cpp

@@ -422,6 +422,9 @@ void QBtSession::configureSession() {
   sessionSettings.auto_scrape_min_interval = 900; // 15 minutes
   int cache_size = pref.diskCacheSize();
   sessionSettings.cache_size = cache_size ? cache_size * 64 : -1;
+#if LIBTORRENT_VERSION_NUM >= 001610
+  sessionSettings.cache_expiry = pref.diskCacheTTL();
+#endif
   qDebug() << "Using a disk cache size of" << cache_size << "MiB";
 #if LIBTORRENT_VERSION_NUM >= 001600
   sessionSettings.anonymous_mode = pref.isAnonymousModeEnabled();