From 784464450a0b04ca0651bce09523bd945e62236c Mon Sep 17 00:00:00 2001
From: Charles Kerr <charles@transmissionbt.com>
Date: Thu, 13 Aug 2009 14:47:56 +0000
Subject: [PATCH] (trunk libT) fix #2162: .resume file doesn't get saved often
 enough when its contents change

---
 libtransmission/session.c | 39 +++++++++++++++++++++++++++++++++++++++
 libtransmission/session.h |  1 +
 libtransmission/torrent.c | 18 +++++++++++++-----
 libtransmission/torrent.h |  3 +++
 4 files changed, 56 insertions(+), 5 deletions(-)

diff --git a/libtransmission/session.c b/libtransmission/session.c
index 7445a22a1..a515402e0 100644
--- a/libtransmission/session.c
+++ b/libtransmission/session.c
@@ -47,6 +47,12 @@
 #include "version.h"
 #include "web.h"
 
+enum
+{
+    SAVE_INTERVAL_SECS = 120
+};
+
+
 #define dbgmsg( ... ) \
     do { \
         if( tr_deepLoggingIsActive( ) ) \
@@ -530,6 +536,31 @@ tr_sessionSaveSettings( tr_session    * session,
     tr_bencFree( &settings );
 }
 
+/***
+****
+***/
+
+/**
+ * Periodically save the .resume files of any torrents whose
+ * status has recently changed.  This prevents loss of metadata
+ * in the case of a crash, unclean shutdown, clumsy user, etc.
+ */
+static void
+onSaveTimer( int foo UNUSED, short bar UNUSED, void * vsession )
+{
+    tr_torrent * tor = NULL;
+    tr_session * session = vsession;
+
+    while(( tor = tr_torrentNext( session, tor )))
+        tr_torrentSave( tor );
+
+    tr_timerAdd( session->saveTimer, SAVE_INTERVAL_SECS, 0 );
+}
+
+/***
+****
+***/
+
 static void tr_sessionInitImpl( void * );
 static void onAltTimer( int, short, void* );
 static void setAltTimer( tr_session * session );
@@ -834,6 +865,10 @@ tr_sessionInitImpl( void * vdata )
     evtimer_set( session->altTimer, onAltTimer, session );
     setAltTimer( session );
 
+    session->saveTimer = tr_new0( struct event, 1 );
+    evtimer_set( session->saveTimer, onSaveTimer, session );
+    tr_timerAdd( session->saveTimer, SAVE_INTERVAL_SECS, 0 );
+
     /* first %s is the application name
        second %s is the version number */
     tr_inf( _( "%s %s started" ), TR_NAME, LONG_VERSION_STRING );
@@ -1423,6 +1458,10 @@ sessionCloseImpl( void * vsession )
     if( session->isDHTEnabled )
         tr_dhtUninit( session );
 
+    evtimer_del( session->saveTimer );
+    tr_free( session->saveTimer );
+    session->saveTimer = NULL;
+
     evtimer_del( session->altTimer );
     tr_free( session->altTimer );
     session->altTimer = NULL;
diff --git a/libtransmission/session.h b/libtransmission/session.h
index ef960b7eb..d88b28c74 100644
--- a/libtransmission/session.h
+++ b/libtransmission/session.h
@@ -124,6 +124,7 @@ struct tr_session
     tr_benc                    * metainfoLookup;
 
     struct event               * altTimer;
+    struct event               * saveTimer;
 
     /* the size of the output buffer for peer connections */
     int so_sndbuf;
diff --git a/libtransmission/torrent.c b/libtransmission/torrent.c
index 23ba274a2..928e3350a 100644
--- a/libtransmission/torrent.c
+++ b/libtransmission/torrent.c
@@ -1354,6 +1354,17 @@ tr_torrentVerify( tr_torrent * tor )
         tr_runInEventThread( tor->session, verifyTorrent, tor );
 }
 
+void
+tr_torrentSave( tr_torrent * tor )
+{
+    assert( tr_isTorrent( tor ) );
+
+    if( tor->isDirty ) {
+        tor->isDirty = FALSE;
+        tr_torrentSaveResume( tor );
+    }
+}
+
 static void
 stopTorrent( void * vtor )
 {
@@ -1367,11 +1378,8 @@ stopTorrent( void * vtor )
 
     tr_fdTorrentClose( tor->uniqueId );
 
-    if( tor->isDirty ) {
-        tor->isDirty = 0;
-        if( !tor->isDeleting )
-            tr_torrentSaveResume( tor );
-    }
+    if( !tor->isDeleting )
+        tr_torrentSave( tor );
 }
 
 void
diff --git a/libtransmission/torrent.h b/libtransmission/torrent.h
index c4bbf7eee..812d4fd1c 100644
--- a/libtransmission/torrent.h
+++ b/libtransmission/torrent.h
@@ -118,6 +118,9 @@ tr_torrent*      tr_torrentNext( tr_session  * session,
 
 void             tr_torrentCheckSeedRatio( tr_torrent * tor );
 
+/** save a torrent's .resume file if it's changed since the last time it was saved */
+void             tr_torrentSave( tr_torrent * tor );
+
 
 
 typedef enum