OpenStack Study: networkutils.py

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# 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.

"""

Utility class for network related operations.

"""

import sys

import uuid

if sys.platform == 'win32':

import wmi

from nova.openstack.common.gettextutils import _

from nova.virt.hyperv import vmutils

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class NetworkUtils(object):

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    def __init__(self):

        if sys.platform == 'win32':

            self._conn = wmi.WMI(moniker='//./root/virtualization')

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    def get_external_vswitch(self, vswitch_name):

        if vswitch_name:

            vswitches = self._conn.Msvm_VirtualSwitch(ElementName=vswitch_name)

        else:

            # Find the vswitch that is connected to the first physical nic.

            ext_port = self._conn.Msvm_ExternalEthernetPort(IsBound='TRUE')[0]

            port = ext_port.associators(wmi_result_class='Msvm_SwitchPort')[0]

            vswitches = port.associators(wmi_result_class='Msvm_VirtualSwitch')

        if not len(vswitches):

            raise vmutils.HyperVException(_('vswitch "%s" not found')

                                          % vswitch_name)

        return vswitches[0].path_()

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    def create_vswitch_port(self, vswitch_path, port_name):

        switch_svc = self._conn.Msvm_VirtualSwitchManagementService()[0]

        #Create a port on the vswitch.

        (new_port, ret_val) = switch_svc.CreateSwitchPort(

            Name=str(uuid.uuid4()),

            FriendlyName=port_name,

            ScopeOfResidence="",

            VirtualSwitch=vswitch_path)

        if ret_val != 0:

            raise vmutils.HyperVException(_("Failed to create vswitch port "

                                            "%(port_name)s on switch "

                                            "%(vswitch_path)s") %

                                          {'port_name': port_name,

                                           'vswitch_path': vswitch_path})

        return new_port

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    def vswitch_port_needed(self):

        # NOTE(alexpilotti): In WMI V2 the vswitch_path is set in the VM

        # setting data without the need for a vswitch port.

        return True