Add better error handling when batch refresh fails, etc.

Also don't force refresh when view is requested; instead just do a refresh
after batch is first created.

tailbone/views/batch.py

@@ -531,7 +531,18 @@ class BatchCrud(BaseCrud):
         # transaction binding etc.
         session = RatSession()
         batch = session.query(self.batch_class).get(batch_uuid)
-        self.refresh_data(session, batch, progress=progress)
+        try:
+            self.refresh_data(session, batch, progress=progress)
+        except Exception as error:
+            session.rollback()
+            log.exception("refreshing data for batch failed: {0}".format(batch))
+            session.close()
+            progress.session.load()
+            progress.session['error'] = True
+            progress.session['error_msg'] = "Data refresh failed: {0}".format(error)
+            progress.session.save()
+            return
+
         session.commit()
         session.refresh(batch)
         session.close()
@@ -572,13 +583,13 @@ class FileBatchCrud(BatchCrud):
     """
     refreshable = True
 
-    def pre_crud(self, batch):
+    def post_create_url(self, form):
         """
-        Force refresh if batch has yet to be cognized.
+        Redirect to refresh batch after creating a batch.
         """
-        if not self.creating and not batch.cognized:
+        batch = form.fieldset.model
-            return HTTPFound(location=self.request.route_url(
+        Session.flush()
-                    '{0}.refresh'.format(self.route_prefix), uuid=batch.uuid))
+        return self.refresh_url(batch.uuid)
 
     @property
     def upload_dir(self):