Journal list view: don't choke on invalid or incomplete metadata (SL#1408)

Metadata can get corrupted by crashes or malformed by buggy activities.
We should do our best to display the parts that are usable and certainly
never mess up the entire Journal.

Acked-by: Simon Schampijer <simon@schampijer.de>

1 files changed, 36 insertions, 13 deletions

diff --git a/src/jarabe/journal/listmodel.py b/src/jarabe/journal/listmodel.py
index 55f83f4..cef636e 100644
--- a/src/jarabe/journal/listmodel.py
+++ b/src/jarabe/journal/listmodel.py
@@ -140,11 +140,16 @@ class ListModel(gtk.GenericTreeModel, gtk.TreeDragSource):
             xo_color = misc.get_icon_color(metadata)
         self._cached_row.append(xo_color)
 
-        title = gobject.markup_escape_text(metadata.get('title', None))
-        self._cached_row.append('<b>%s</b>' % title)
+        title = gobject.markup_escape_text(metadata.get('title',
+                                           _('Untitled')))
+        self._cached_row.append('<b>%s</b>' % (title, ))
 
-        timestamp = int(metadata.get('timestamp', 0))
-        self._cached_row.append(util.timestamp_to_elapsed_string(timestamp))
+        try:
+            timestamp = float(metadata.get('timestamp', 0))
+        except (TypeError, ValueError):
+            self._cached_row.append(_('Unknown'))
+        else:
+            self._cached_row.append(util.timestamp_to_elapsed_string(timestamp))
 
         try:
             creation_time = float(metadata.get('creation_time'))
@@ -161,19 +166,37 @@ class ListModel(gtk.GenericTreeModel, gtk.TreeDragSource):
         else:
             self._cached_row.append(util.format_size(size))
 
-        self._cached_row.append(int(metadata.get('progress', 100)))
-
-        if metadata.get('buddies', ''):
-            buddies = simplejson.loads(metadata['buddies']).values()
-        else:
+        try:
+            progress = int(float(metadata.get('progress', 100)))
+        except (TypeError, ValueError):
+            progress = 100
+        self._cached_row.append(progress)
+
+        buddies = []
+        if metadata.get('buddies'):
+            try:
+                buddies = simplejson.loads(metadata['buddies']).values()
+            except simplejson.decoder.JSONDecodeError, exception:
+                logging.warning('Cannot decode buddies for %r: %s',
+                                metadata['uid'], exception)
+
+        if not isinstance(buddies, list):
+            logging.warning('Content of buddies for %r is not a list: %r',
+                            metadata['uid'], buddies)
             buddies = []
 
         for n_ in xrange(0, 3):
             if buddies:
-                nick, color = buddies.pop(0)
-                self._cached_row.append((nick, XoColor(color)))
-            else:
-                self._cached_row.append(None)
+                try:
+                    nick, color = buddies.pop(0)
+                except (AttributeError, ValueError), exception:
+                    logging.warning('Malformed buddies for %r: %s',
+                                    metadata['uid'], exception)
+                else:
+                    self._cached_row.append((nick, XoColor(color)))
+                    continue
+
+            self._cached_row.append(None)
 
         return self._cached_row[column]