appengine/monorail/framework/warmup.py

# Copyright 2017 The Chromium Authors. All rights reserved.
# Use of this source code is govered by a BSD-style
# license that can be found in the LICENSE file or at
# https://developers.google.com/open-source/licenses/bsd

"""A class to handle the initial warmup request from AppEngine."""

import logging

from framework import jsonfeed


class Warmup(jsonfeed.InternalTask):
  """Placeholder for warmup work.  Used only to enable min_idle_instances."""

  def HandleRequest(self, _mr):
    """Don't do anything that could cause a jam when many instances start."""
    logging.info('/_ah/startup does nothing in Monorail.')
    logging.info('However it is needed for min_idle_instances in app.yaml.')

    return {
      'success': 1,
      }