# Copyright (c) 2013, 2014, Oracle and/or its affiliates. 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.

#

# @author: Girish Moodalbail, Oracle, Inc.

from oslo.config import cfg

from quantum.agent.linux import utils

from quantum.agent.solaris import net_lib

OPTS = [

    cfg.StrOpt('evs_controller', default='ssh://evsuser@localhost',

               help=_("An URI that specifies an EVS controller"))

]

class SolarisVNICDriver(object):

    """Driver used to manage Solaris EVS VNICs.

    This class provides methods to create/delete an EVS VNIC and

    plumb/unplumb ab IP interface and addresses on the EVS VNIC.

    """

    # TODO(gmoodalb): dnsmasq uses old style `ifreq', so 16 is the maximum

    # length including the NUL character. If we change it to use new style

    # `lifreq', then we will be able to extend the length to 32 characters.

    VNIC_NAME_MAXLEN = 15

    VNIC_NAME_PREFIX = 'evs'

    VNIC_NAME_SUFFIX = '_0'

    VNIC_NAME_LEN_WO_SUFFIX = VNIC_NAME_MAXLEN - \

        len(VNIC_NAME_SUFFIX)

    def __init__(self, conf):

        self.conf = conf

        # Since there is no connect_uri() yet, we need to do this ourselves

        # parse ssh://user@hostname

        suh = self.conf.evs_controller.split('://')

        if len(suh) != 2 or suh[0] != 'ssh' or not suh[1].strip():

            raise SystemExit(_("Specified evs_controller is invalid"))

        uh = suh[1].split('@')

        if len(uh) != 2 or not uh[0].strip() or not uh[1].strip():

            raise SystemExit(_("'user' and 'hostname' need to be specified "

                               "for evs_controller"))

        # set the controller property for this host

        cmd = ['/usr/sbin/evsadm', 'show-prop', '-co', 'value', '-p',

               'controller']

        stdout = utils.execute(cmd)

        if conf.evs_controller != stdout.strip():

            cmd = ['/usr/sbin/evsadm', 'set-prop', '-p',

                   'controller=%s' % (conf.evs_controller)]

            utils.execute(cmd)

    def fini_l3(self, device_name):

        ipif = net_lib.IPInterface(device_name)

        ipif.delete_ip()

    def init_l3(self, device_name, ip_cidrs):

        """Set the L3 settings for the interface using data from the port.

           ip_cidrs: list of 'X.X.X.X/YY' strings

        """

        ipif = net_lib.IPInterface(device_name)

        for ip_cidr in ip_cidrs:

            ipif.create_address(ip_cidr)

    # TODO(gmoodalb): - probably take PREFIX?? for L3

    def get_device_name(self, port):

        vnicname = (self.VNIC_NAME_PREFIX +

                    port.id)[:self.VNIC_NAME_LEN_WO_SUFFIX]

        vnicname += self.VNIC_NAME_SUFFIX

        return vnicname.replace('-', '_')

    def plug(self, tenant_id, network_id, port_id, datalink_name,

             namespace=None, prefix=None):

        """Plug in the interface."""

        evs_vport = ('%s/%s') % (network_id, port_id)

        dl = net_lib.Datalink(datalink_name)

        dl.connect_vnic(evs_vport, tenant_id)

    def unplug(self, device_name, namespace=None, prefix=None):

        """Unplug the interface."""

        dl = net_lib.Datalink(device_name)

        dl.delete_vnic()