Merge pull request #9 from heyman/stack-workaround

Workaround for inspect.stack() failing when jinja2 templates are on the stack

debug_toolbar_mongo/operation_tracker.py

@@ -31,7 +31,20 @@ removes = []
 WANT_STACK_TRACE = getattr(settings, 'DEBUG_TOOLBAR_MONGO_STACKTRACES', True)
 def _get_stacktrace():
     if WANT_STACK_TRACE:
-        return _tidy_stacktrace(reversed(inspect.stack()))
+        try:
+            stack = inspect.stack()
+        except IndexError:
+            # this is a work around because python's inspect.stack() sometimes fail
+            # when jinja templates are on the stack
+            return [(
+                "",
+                0,
+                "Error retrieving stack",
+                "Could not retrieve stack. IndexError exception occured in inspect.stack(). "
+                "This error might occur when jinja2 templates is on the stack.",
+            )]
+        
+        return _tidy_stacktrace(reversed(stack))
     else:
         return []