Save and restore state of the game

Ability to 'save' (when the user closes the Activity) and 'restore' (when the
user launch it from the Journal or the Home without holding Alt) the state of
the game.

For this ability I had to upgrade 'olpcgames' to 1.6 because
'olpcgames.FILE_READ_REQUEST' and 'olpcgames.FILE_WRITE_REQUEST' events are
added in that version and those events are needed for this.

The data is saved (as JSON, with json module) in the 'event.metadata["state"]' and the timestamp state is saved in 'event.filename'.

This commit solves ticket #2393:
 * http://bugs.sugarlabs.org/ticket/2393

Signed-off-by: Manuel Kaufmann <humitos@gmail.com>
Signed-off-by: Rafael Ortiz <rafael@activitycentral.com>

1 files changed, 19 insertions, 8 deletions

diff --git a/olpcgames/util.py b/olpcgames/util.py
index f4ecbf0..49a23b0 100644
--- a/olpcgames/util.py
+++ b/olpcgames/util.py
@@ -58,11 +58,22 @@ def get_traceback(error):
             util.get_traceback( err ),
         )
     """
-    exception = str(error)
-    file = cStringIO.StringIO()
-    try:
-        traceback.print_exc( limit=10, file = file )
-        exception = file.getvalue()
-    finally:
-        file.close()
-    return exception
+    if error is None:
+        error = []
+        for (f,l,func,statement) in traceback.extract_stack()[:-2]:
+            if statement:
+                statement = ': %s'%( statement, )
+            if func:
+                error.append( '%s.%s (%s)%s'%( f,func,l, statement))
+            else:
+                error.append( '%s (%s)%s'%( f,l, statement))
+        return "\n".join( error )
+    else:
+        exception = str(error)
+        file = cStringIO.StringIO()
+        try:
+            traceback.print_exc( limit=10, file = file )
+            exception = file.getvalue()
+        finally:
+            file.close()
+        return exception