text: #!/usr/bin/env python
  #
  # Copyright 2016 the original author or authors.
  #
  # Licensed 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
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  #
  
  """ Rest API to check health of Voltha instance """
  
  from klein import Klein
  from structlog import get_logger
  from twisted.internet import endpoints
  from twisted.internet import reactor
  from twisted.web.server import Site
  
  
  class HealthCheck(object):
  
      app = Klein()
      log = get_logger()
  
      @app.route('/health')
      def health_check(self, request):
          # TODO this is just a placeholder, very crude health check
          self.log.debug("health-check-received")
          return '{"status": "ok"}'
  
      def get_site(self):
          return Site(self.app.resource())
  
  
  def init_rest_service(port):
      hc = HealthCheck()
      endpoint = endpoints.TCP4ServerEndpoint(reactor, port)
      endpoint.listen(hc.get_site())
  