old_contents: #    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 keystoneauth1 import loading as ks_loading
  from neutron._i18n import _LW
  from neutron.notifiers import nova as n_nova
  from novaclient import client as nclient
  from novaclient import exceptions as nova_exceptions
  from oslo_config import cfg
  from oslo_log import log as logging
  
  LOG = logging.getLogger(__name__)
  
  
  class NovaClient(object):
  
      def __init__(self):
  
          auth = ks_loading.load_auth_from_conf_options(cfg.CONF, 'nova')
          session = ks_loading.load_session_from_conf_options(
              cfg.CONF, 'nova', auth=auth)
  
          self.nclient = nclient.Client(
              n_nova.NOVA_API_VERSION, session=session,
              region_name=cfg.CONF.nova.region_name,
              endpoint_type=cfg.CONF.nova.endpoint_type)
  
      def get_server(self, server_id):
          try:
              return self.nclient.servers.get(server_id)
          except nova_exceptions.NotFound:
              LOG.warning(_LW("Nova returned NotFound for server: %s"),
                          server_id)
          except Exception as e:
              LOG.exception(e)
  
new_contents: #    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 keystoneauth1 import loading as ks_loading
  from neutron._i18n import _LW
  from neutron.notifiers import nova as n_nova
  from novaclient import client as nclient
  from novaclient import exceptions as nova_exceptions
  from oslo_config import cfg
  from oslo_log import log as logging
  
  LOG = logging.getLogger(__name__)
  
  
  client = None
  
  
  def _get_client():
      global client
      if client is None:
          auth = ks_loading.load_auth_from_conf_options(cfg.CONF, 'nova')
          session = ks_loading.load_session_from_conf_options(
              cfg.CONF, 'nova', auth=auth)
  
          client = nclient.Client(
              n_nova.NOVA_API_VERSION, session=session,
              region_name=cfg.CONF.nova.region_name,
              endpoint_type=cfg.CONF.nova.endpoint_type)
      return client
  
  
  class NovaClient(object):
  
      def __init__(self):
          self.client = _get_client()
  
      def get_server(self, server_id):
          try:
              return self.client.servers.get(server_id)
          except nova_exceptions.NotFound:
              LOG.warning(_LW("Nova returned NotFound for server: %s"),
                          server_id)
          except Exception as e:
              LOG.exception(e)
  
subject: Load Nova Client only once to avoid reconnecting