OpenStack Study: volumeutils.py

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# 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

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class VolumeUtils(basevolumeutils.BaseVolumeUtils):

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def __init__(self):

super(VolumeUtils, self).__init__()

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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)

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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)

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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)

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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)