text: # Copyright 2015 NEC Corporation.  All rights reserved.
  #
  #    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.
  
  from heatclient import exc
  from oslo_log import log as logging
  from pycadf import cadftaxonomy as taxonomy
  
  from magnum.common import exception
  from magnum.common import profiler
  from magnum.conductor.handlers.common import cert_manager
  from magnum.conductor import utils as conductor_utils
  from magnum.drivers.common import driver
  from magnum.i18n import _
  from magnum import objects
  from magnum.objects import fields
  
  import six
  LOG = logging.getLogger(__name__)
  
  
  @profiler.trace_cls("rpc")
  class Handler(object):
      """Magnum CA RPC handler.
  
      These are the backend operations. They are executed by the backend service.
      API calls via AMQP (within the ReST API) trigger the handlers to be called.
  
      """
  
      def __init__(self):
          super(Handler, self).__init__()
  
      def sign_certificate(self, context, cluster, certificate):
          LOG.debug("Creating self signed x509 certificate")
          signed_cert = cert_manager.sign_node_certificate(cluster,
                                                           certificate.csr,
                                                           context=context)
          if six.PY3 and isinstance(signed_cert, six.binary_type):
              certificate.pem = signed_cert.decode()
          else:
              certificate.pem = signed_cert
          return certificate
  
      def get_ca_certificate(self, context, cluster):
          ca_cert = cert_manager.get_cluster_ca_certificate(cluster,
                                                            context=context)
          certificate = objects.Certificate.from_object_cluster(cluster)
          if six.PY3 and isinstance(ca_cert.get_certificate(), six.binary_type):
              certificate.pem = ca_cert.get_certificate().decode()
          else:
              certificate.pem = ca_cert.get_certificate()
          return certificate
  
      def rotate_ca_certificate(self, context, cluster):
          LOG.info('start rotate_ca_certificate for cluster: %s', cluster.uuid)
  
          allow_update_status = (
              fields.ClusterStatus.CREATE_COMPLETE,
              fields.ClusterStatus.UPDATE_COMPLETE,
              fields.ClusterStatus.RESUME_COMPLETE,
              fields.ClusterStatus.RESTORE_COMPLETE,
              fields.ClusterStatus.ROLLBACK_COMPLETE,
              fields.ClusterStatus.SNAPSHOT_COMPLETE,
              fields.ClusterStatus.CHECK_COMPLETE,
              fields.ClusterStatus.ADOPT_COMPLETE
          )
          if cluster.status not in allow_update_status:
              conductor_utils.notify_about_cluster_operation(
                  context, taxonomy.ACTION_UPDATE, taxonomy.OUTCOME_FAILURE,
                  cluster)
              operation = _('Updating a cluster when status is '
                            '"%s"') % cluster.status
              raise exception.NotSupported(operation=operation)
  
          try:
              # re-generate the ca certs
              cert_manager.generate_certificates_to_cluster(cluster,
                                                            context=context)
              cluster_driver = driver.Driver.get_driver_for_cluster(context,
                                                                    cluster)
              cluster_driver.rotate_ca_certificate(context, cluster)
              cluster.status = fields.ClusterStatus.UPDATE_IN_PROGRESS
              cluster.status_reason = None
          except Exception as e:
              cluster.status = fields.ClusterStatus.UPDATE_FAILED
              cluster.status_reason = six.text_type(e)
              cluster.save()
              conductor_utils.notify_about_cluster_operation(
                  context, taxonomy.ACTION_UPDATE, taxonomy.OUTCOME_FAILURE,
                  cluster)
              if isinstance(e, exc.HTTPBadRequest):
                  e = exception.InvalidParameterValue(message=six.text_type(e))
                  raise e
              raise
  
          cluster.save()
          return cluster
  