text: # Copyright 2012 Pedro Navarro Perez
  # Copyright 2013 Cloudbase Solutions Srl
  # 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.
  
  """
  Helper methods for operations related to the management of volumes,
  and storage repositories
  """
  
  import time
  
  from oslo.config import cfg
  
  from nova.openstack.common.gettextutils import _
  from nova import utils
  from nova.virt.hyperv import basevolumeutils
  from nova.virt.hyperv import vmutils
  
  CONF = cfg.CONF
  
  
  class VolumeUtils(basevolumeutils.BaseVolumeUtils):
  
      def __init__(self):
          super(VolumeUtils, self).__init__()
  
      def execute(self, *args, **kwargs):
          stdout_value, stderr_value = utils.execute(*args, **kwargs)
          if stdout_value.find('The operation completed successfully') == -1:
              raise vmutils.HyperVException(_('An error has occurred when '
                                              'calling the iscsi initiator: %s')
                                            % stdout_value)
  
      def login_storage_target(self, target_lun, target_iqn, target_portal):
          """Add target portal, list targets and logins to the target."""
          (target_address,
           target_port) = utils.parse_server_string(target_portal)
  
          #Adding target portal to iscsi initiator. Sending targets
          self.execute('iscsicli.exe ' + 'AddTargetPortal ' +
                       target_address + ' ' + target_port +
                       ' * * * * * * * * * * * * *')
          #Listing targets
          self.execute('iscsicli.exe ' + 'ListTargets')
          #Sending login
          self.execute('iscsicli.exe ' + 'qlogintarget ' + target_iqn)
          #Waiting the disk to be mounted.
          #TODO(pnavarro): Check for the operation to end instead of
          #relying on a timeout
          time.sleep(CONF.hyperv.volume_attach_retry_interval)
  
      def logout_storage_target(self, target_iqn):
          """Logs out storage target through its session id."""
  
          sessions = self._conn_wmi.query("SELECT * FROM "
                                          "MSiSCSIInitiator_SessionClass "
                                          "WHERE TargetName='%s'" % target_iqn)
          for session in sessions:
              self.execute_log_out(session.SessionId)
  
      def execute_log_out(self, session_id):
          """Executes log out of the session described by its session ID."""
          self.execute('iscsicli.exe ' + 'logouttarget ' + session_id)
  