Fix large ETA overflow C int

The following error was encountered in GTK3 which is a result of trying
to cast a very large ETA value to C int and raising an Overlflow error.

   <type 'exceptions.OverflowError'>: 3072227291 not in range -2147483648 to 2147483647

The solution is to limit the ETA to 1 year and represent any values over
that as -1 which the UIs can display as infinity.

deluge/core/torrent.py

@@ -747,7 +747,8 @@ class Torrent(object):
             if left > 0:
                 eta = left // status.download_payload_rate
 
-        return eta
+        # Limit to 1 year, avoid excessive values and prevent GTK int overflow.
+        return eta if eta < 31557600 else -1
 
     def get_ratio(self):
         """Get the ratio of upload/download for this torrent.

deluge/ui/console/utils/format_utils.py

@@ -31,8 +31,10 @@ def format_speed(speed):
 def format_time(time):
     if time > 0:
         return deluge.common.ftime(time)
-    else:
+    elif time == 0:
         return '-'
+    else:
+        return '∞'
 
 
 def format_date_dash(time):

deluge/ui/gtkui/tab_data_funcs.py

@@ -50,7 +50,12 @@ def fdate_or_dash(value):
 
 def ftime_or_dash(value):
     """Display value as time, eg 2h 30m or dash"""
-    return ftime(value) if value > 0 else '-'
+    if value > 0:
+        return ftime(value)
+    elif value == 0:
+        return '-'
+    else:
+        return '∞'
 
 
 def fseed_rank_or_dash(seed_rank, seeding_time):

deluge/ui/web/js/deluge-all/TorrentGrid.js

@@ -74,6 +74,10 @@
         return date > 0.0 ? fdate(date) : _('Never');
     }
 
+    function timeOrInf(time) {
+        return time < 0 ? '&infin;' : ftime(time);
+    }
+
     /**
      * Deluge.TorrentGrid Class
      *
@@ -154,7 +158,7 @@
                 header: _('ETA'),
                 width: 60,
                 sortable: true,
-                renderer: ftime,
+                renderer: timeOrInf,
                 dataIndex: 'eta',
             },
             {

deluge/ui/web/js/deluge-all/details/StatusTab.js

@@ -102,7 +102,7 @@ Deluge.details.StatusTab = Ext.extend(Ext.Panel, {
             upspeed: status.upload_payload_rate
                 ? fspeed(status.upload_payload_rate)
                 : '0.0 KiB/s',
-            eta: ftime(status.eta),
+            eta: status.eta < 0 ? '&infin;' : ftime(status.eta),
             pieces: status.num_pieces + ' (' + fsize(status.piece_length) + ')',
             seeds: seeds,
             peers: peers,