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# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# 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 abc
import sys
if sys.platform == 'win32':
import _winreg
import wmi
from nova import block_device
from nova.openstack.common import log as logging
from nova.virt import driver
LOG = logging.getLogger(__name__)
class BaseVolumeUtils(object):
def __init__(self, host='.'):
if sys.platform == 'win32':
self._conn_wmi = wmi.WMI(moniker='//%s/root/wmi' % host)
self._conn_cimv2 = wmi.WMI(moniker='//%s/root/cimv2' % host)
@abc.abstractmethod
def login_storage_target(self, target_lun, target_iqn, target_portal):
pass
@abc.abstractmethod
def logout_storage_target(self, target_iqn):
pass
@abc.abstractmethod
def execute_log_out(self, session_id):
pass
def get_iscsi_initiator(self):
"""Get iscsi initiator name for this machine."""
computer_system = self._conn_cimv2.Win32_ComputerSystem()[0]
hostname = computer_system.name
keypath = ("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\"
"iSCSI\\Discovery")
try:
key = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, keypath, 0,
_winreg.KEY_ALL_ACCESS)
temp = _winreg.QueryValueEx(key, 'DefaultInitiatorName')
initiator_name = str(temp[0])
_winreg.CloseKey(key)
except Exception:
LOG.info(_("The ISCSI initiator name can't be found. "
"Choosing the default one"))
computer_system = self._conn_cimv2.Win32_ComputerSystem()[0]
initiator_name = "iqn.1991-05.com.microsoft:" + hostname.lower()
return initiator_name
def volume_in_mapping(self, mount_device, block_device_info):
block_device_list = [block_device.strip_dev(vol['mount_device'])
for vol in
driver.block_device_info_get_mapping(
block_device_info)]
swap = driver.block_device_info_get_swap(block_device_info)
if driver.swap_is_usable(swap):
block_device_list.append(
block_device.strip_dev(swap['device_name']))
block_device_list += [block_device.strip_dev(
ephemeral['device_name'])
for ephemeral in
driver.block_device_info_get_ephemerals(block_device_info)]
LOG.debug(_("block_device_list %s"), block_device_list)
return block_device.strip_dev(mount_device) in block_device_list
def _get_drive_number_from_disk_path(self, disk_path):
# TODO(pnavarro) replace with regex
start_device_id = disk_path.find('"', disk_path.find('DeviceID'))
end_device_id = disk_path.find('"', start_device_id + 1)
device_id = disk_path[start_device_id + 1:end_device_id]
drive_number = device_id[device_id.find("\\") + 2:]
if drive_number == 'NODRIVE':
return None
return int(drive_number)
def get_session_id_from_mounted_disk(self, physical_drive_path):
drive_number = self._get_drive_number_from_disk_path(
physical_drive_path)
if not drive_number:
return None
initiator_sessions = self._conn_wmi.query("SELECT * FROM "
"MSiSCSIInitiator_Session"
"Class")
for initiator_session in initiator_sessions:
devices = initiator_session.Devices
for device in devices:
device_number = device.DeviceNumber
if device_number == drive_number:
return initiator_session.SessionId
def get_device_number_for_target(self, target_iqn, target_lun):
initiator_sessions = self._conn_wmi.query("SELECT * FROM "
"MSiSCSIInitiator_Session"
"Class WHERE TargetName='%s'"
% target_iqn)
if not initiator_sessions:
return None
devices = initiator_sessions[0].Devices
for device in devices:
if device.ScsiLun == target_lun:
return device.DeviceNumber
def get_target_from_disk_path(self, disk_path):
initiator_sessions = self._conn_wmi.MSiSCSIInitiator_SessionClass()
drive_number = self._get_drive_number_from_disk_path(disk_path)
if not drive_number:
return None
for initiator_session in initiator_sessions:
devices = initiator_session.Devices
for device in devices:
if device.DeviceNumber == drive_number:
return (device.TargetName, device.ScsiLun)
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