Change blobuploadcleanupworker to use a data interface

data/model/blob.py

@@ -88,6 +88,17 @@ def get_stale_blob_upload(stale_timespan):
     return None
 
 
+def get_blob_upload_by_uuid(upload_uuid):
+  """ Loads the upload with the given UUID, if any. """
+  try:
+    return (BlobUpload
+            .select()
+            .where(BlobUpload.uuid == upload_uuid)
+            .get())
+  except BlobUpload.DoesNotExist:
+    return None
+
+
 def get_blob_upload(namespace, repo_name, upload_uuid):
   """ Load the upload which is already in progress.
   """