# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
#    Copyright 2012 Nicira, Inc
#
#    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.

from lxml import etree

from nova import flags
from nova import test
from nova import utils
from nova.virt.libvirt import config
from nova.virt.libvirt import vif

FLAGS = flags.FLAGS


class LibvirtVifTestCase(test.TestCase):

    net = {
             'cidr': '101.168.1.0/24',
             'cidr_v6': '101:1db9::/64',
             'gateway_v6': '101:1db9::1',
             'netmask_v6': '64',
             'netmask': '255.255.255.0',
             'bridge': 'br0',
             'bridge_interface': 'eth0',
             'vlan': 99,
             'gateway': '101.168.1.1',
             'broadcast': '101.168.1.255',
             'dns1': '8.8.8.8'
    }

    mapping = {
        'mac': 'ca:fe:de:ad:be:ef',
        'gateway_v6': net['gateway_v6'],
        'ips': [{'ip': '101.168.1.9'}],
        'dhcp_server': '191.168.1.1',
        'vif_uuid': 'vif-xxx-yyy-zzz'
    }

    instance = {
        'name': 'instance-name',
        'uuid': 'instance-uuid'
    }

    def setUp(self):
        super(LibvirtVifTestCase, self).setUp()
        self.flags(allow_same_net_traffic=True)
        self.executes = []

        def fake_execute(*cmd, **kwargs):
            self.executes.append(cmd)
            return None, None

        self.stubs.Set(utils, 'execute', fake_execute)

    def _get_instance_xml(self, driver):
        conf = config.LibvirtConfigGuest()
        conf.virt_type = "qemu"
        conf.name = "fake-name"
        conf.uuid = "fake-uuid"
        conf.memory = 100 * 1024
        conf.vcpus = 4

        nic = driver.plug(self.instance, (self.net, self.mapping))
        conf.add_device(nic)
        return conf.to_xml()

    def test_bridge_driver(self):
        d = vif.LibvirtBridgeDriver()
        xml = self._get_instance_xml(d)

        doc = etree.fromstring(xml)
        ret = doc.findall('./devices/interface')
        self.assertEqual(len(ret), 1)
        node = ret[0]
        self.assertEqual(node.get("type"), "bridge")
        br_name = node.find("source").get("bridge")
        self.assertEqual(br_name, self.net['bridge'])
        mac = node.find("mac").get("address")
        self.assertEqual(mac, self.mapping['mac'])

        d.unplug(None, (self.net, self.mapping))

    def test_ovs_ethernet_driver(self):
        d = vif.LibvirtOpenVswitchDriver()
        xml = self._get_instance_xml(d)

        doc = etree.fromstring(xml)
        ret = doc.findall('./devices/interface')
        self.assertEqual(len(ret), 1)
        node = ret[0]
        self.assertEqual(node.get("type"), "ethernet")
        dev_name = node.find("target").get("dev")
        self.assertTrue(dev_name.startswith("tap"))
        mac = node.find("mac").get("address")
        self.assertEqual(mac, self.mapping['mac'])
        script = node.find("script").get("path")
        self.assertEquals(script, "")

        d.unplug(None, (self.net, self.mapping))

    def test_ovs_virtualport_driver(self):
        d = vif.LibvirtOpenVswitchVirtualPortDriver()
        xml = self._get_instance_xml(d)

        doc = etree.fromstring(xml)
        ret = doc.findall('./devices/interface')
        self.assertEqual(len(ret), 1)
        node = ret[0]
        self.assertEqual(node.get("type"), "bridge")

        br_name = node.find("source").get("bridge")
        self.assertEqual(br_name, FLAGS.libvirt_ovs_bridge)
        mac = node.find("mac").get("address")
        self.assertEqual(mac, self.mapping['mac'])
        vp = node.find("virtualport")
        self.assertEqual(vp.get("type"), "openvswitch")
        iface_id_found = False
        for p_elem in vp.findall("parameters"):
            iface_id = p_elem.get("interfaceid", None)
            if iface_id:
                self.assertEqual(iface_id, self.mapping['vif_uuid'])
                iface_id_found = True

        self.assertTrue(iface_id_found)
        d.unplug(None, (self.net, self.mapping))

    def test_quantum_bridge_ethernet_driver(self):
        d = vif.QuantumLinuxBridgeVIFDriver()
        xml = self._get_instance_xml(d)

        doc = etree.fromstring(xml)
        ret = doc.findall('./devices/interface')
        self.assertEqual(len(ret), 1)
        node = ret[0]
        self.assertEqual(node.get("type"), "ethernet")
        dev_name = node.find("target").get("dev")
        self.assertTrue(dev_name.startswith("tap"))
        mac = node.find("mac").get("address")
        self.assertEqual(mac, self.mapping['mac'])
        script = node.find("script").get("path")
        self.assertEquals(script, "")

        d.unplug(None, (self.net, self.mapping))