#!/usr/bin/env python3
# -*- encoding: utf-8 -*-

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#  or more contributor license agreements.  See the NOTICE file
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#  regarding copyright ownership.  The ASF licenses this file
#  to you under the Apache License, Version 2.0 (the
#  "License"); you may not use this file except in compliance
#  with the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
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''' clustershandler.py '''
import tornado.gen

from heron.tools.tracker.src.python.handlers import BaseHandler

# pylint: disable=attribute-defined-outside-init
class ClustersHandler(BaseHandler):
  """
  URL - /clusters

  The response JSON is a list of clusters
  """

  def initialize(self, tracker):
    """ initialize """
    self.tracker = tracker

  @tornado.gen.coroutine
  def get(self):
    """ get method """
    clusters = [statemgr.name for statemgr in self.tracker.state_managers]

    self.write_success_response(clusters)