Delete the image diff feature

Fixes #1077

workers/diffsworker.py

@@ -1,37 +0,0 @@
-import logging
-
-from app import image_diff_queue
-from data import model
-from endpoints.v1.registry import process_image_changes
-from workers.queueworker import QueueWorker
-
-
-logger = logging.getLogger(__name__)
-
-
-class DiffsWorker(QueueWorker):
-  def process_queue_item(self, job_details):
-    image_id = job_details['image_id']
-    repository = job_details['repository']
-    namespace = model.user.get_namespace_by_user_id(job_details['namespace_user_id'])
-
-    try:
-      process_image_changes(namespace, repository, image_id)
-    except model.DataModelException:
-      # This exception is unrecoverable, and the item should continue and be
-      # marked as complete.
-      msg = ('Image does not exist in database \'%s\' for repo \'%s/\'%s\'' %
-             (image_id, namespace, repository))
-      logger.warning(msg)
-    except IOError:
-      # This exception is unrecoverable, and the item should continue and be
-      # marked as complete.
-      msg = ("Data could not be retrieved for image %s under repo %s/%s" %
-             (image_id, namespace, repository))
-      logger.exception(msg)
-
-    return True
-
-if __name__ == "__main__":
-  worker = DiffsWorker(image_diff_queue)
-  worker.start()