# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2011 Rackspace
# 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.

from nova import db
from nova import exception
from nova import flags
from nova import log as logging
from nova import test
from nova.network import manager as network_manager


import mox


FLAGS = flags.FLAGS
LOG = logging.getLogger('nova.tests.network')


HOST = "testhost"


class FakeModel(dict):
    """Represent a model from the db"""
    def __init__(self, *args, **kwargs):
        self.update(kwargs)

        def __getattr__(self, name):
            return self[name]


networks = [{'id': 0,
             'label': 'test0',
             'injected': False,
             'multi_host': False,
             'cidr': '192.168.0.0/24',
             'cidr_v6': '2001:db8::/64',
             'gateway_v6': '2001:db8::1',
             'netmask_v6': '64',
             'netmask': '255.255.255.0',
             'bridge': 'fa0',
             'bridge_interface': 'fake_fa0',
             'gateway': '192.168.0.1',
             'broadcast': '192.168.0.255',
             'dns1': '192.168.0.1',
             'dns2': '192.168.0.2',
             'vlan': None,
             'host': None,
             'project_id': 'fake_project',
             'vpn_public_address': '192.168.0.2'},
            {'id': 1,
             'label': 'test1',
             'injected': False,
             'multi_host': False,
             'cidr': '192.168.1.0/24',
             'cidr_v6': '2001:db9::/64',
             'gateway_v6': '2001:db9::1',
             'netmask_v6': '64',
             'netmask': '255.255.255.0',
             'bridge': 'fa1',
             'bridge_interface': 'fake_fa1',
             'gateway': '192.168.1.1',
             'broadcast': '192.168.1.255',
             'dns1': '192.168.0.1',
             'dns2': '192.168.0.2',
             'vlan': None,
             'host': None,
             'project_id': 'fake_project',
             'vpn_public_address': '192.168.1.2'}]


fixed_ips = [{'id': 0,
              'network_id': 0,
              'address': '192.168.0.100',
              'instance_id': 0,
              'allocated': False,
              'virtual_interface_id': 0,
              'floating_ips': []},
             {'id': 0,
              'network_id': 1,
              'address': '192.168.1.100',
              'instance_id': 0,
              'allocated': False,
              'virtual_interface_id': 0,
              'floating_ips': []}]


flavor = {'id': 0,
          'rxtx_cap': 3}


floating_ip_fields = {'id': 0,
                      'address': '192.168.10.100',
                      'fixed_ip_id': 0,
                      'project_id': None,
                      'auto_assigned': False}

vifs = [{'id': 0,
         'address': 'DE:AD:BE:EF:00:00',
         'network_id': 0,
         'network': FakeModel(**networks[0]),
         'instance_id': 0},
        {'id': 1,
         'address': 'DE:AD:BE:EF:00:01',
         'network_id': 1,
         'network': FakeModel(**networks[1]),
         'instance_id': 0}]


class FlatNetworkTestCase(test.TestCase):
    def setUp(self):
        super(FlatNetworkTestCase, self).setUp()
        self.network = network_manager.FlatManager(host=HOST)
        self.network.db = db

    def test_get_instance_nw_info(self):
        self.mox.StubOutWithMock(db, 'fixed_ip_get_by_instance')
        self.mox.StubOutWithMock(db, 'virtual_interface_get_by_instance')
        self.mox.StubOutWithMock(db, 'instance_type_get')

        db.fixed_ip_get_by_instance(mox.IgnoreArg(),
                                    mox.IgnoreArg()).AndReturn(fixed_ips)
        db.virtual_interface_get_by_instance(mox.IgnoreArg(),
                                             mox.IgnoreArg()).AndReturn(vifs)
        db.instance_type_get(mox.IgnoreArg(),
                                   mox.IgnoreArg()).AndReturn(flavor)
        self.mox.ReplayAll()

        nw_info = self.network.get_instance_nw_info(None, 0, 0, None)

        self.assertTrue(nw_info)

        for i, nw in enumerate(nw_info):
            i8 = i + 8
            check = {'bridge': 'fa%s' % i,
                     'cidr': '192.168.%s.0/24' % i,
                     'cidr_v6': '2001:db%s::/64' % i8,
                     'id': i,
                     'multi_host': False,
                     'injected': 'DONTCARE',
                     'bridge_interface': 'fake_fa%s' % i,
                     'vlan': None}

            self.assertDictMatch(nw[0], check)

            check = {'broadcast': '192.168.%s.255' % i,
                     'dhcp_server': '192.168.%s.1' % i,
                     'dns': 'DONTCARE',
                     'gateway': '192.168.%s.1' % i,
                     'gateway6': '2001:db%s::1' % i8,
                     'ip6s': 'DONTCARE',
                     'ips': 'DONTCARE',
                     'label': 'test%s' % i,
                     'mac': 'DE:AD:BE:EF:00:0%s' % i,
                     'rxtx_cap': 'DONTCARE',
                     'should_create_vlan': False,
                     'should_create_bridge': False}
            self.assertDictMatch(nw[1], check)

            check = [{'enabled': 'DONTCARE',
                      'ip': '2001:db%s::dcad:beff:feef:%s' % (i8, i),
                      'netmask': '64'}]
            self.assertDictListMatch(nw[1]['ip6s'], check)

            check = [{'enabled': '1',
                      'ip': '192.168.%s.100' % i,
                      'netmask': '255.255.255.0'}]
            self.assertDictListMatch(nw[1]['ips'], check)


class VlanNetworkTestCase(test.TestCase):
    def setUp(self):
        super(VlanNetworkTestCase, self).setUp()
        self.network = network_manager.VlanManager(host=HOST)
        self.network.db = db

    def test_vpn_allocate_fixed_ip(self):
        self.mox.StubOutWithMock(db, 'fixed_ip_associate')
        self.mox.StubOutWithMock(db, 'fixed_ip_update')
        self.mox.StubOutWithMock(db,
                              'virtual_interface_get_by_instance_and_network')

        db.fixed_ip_associate(mox.IgnoreArg(),
                              mox.IgnoreArg(),
                              mox.IgnoreArg()).AndReturn('192.168.0.1')
        db.fixed_ip_update(mox.IgnoreArg(),
                           mox.IgnoreArg(),
                           mox.IgnoreArg())
        db.virtual_interface_get_by_instance_and_network(mox.IgnoreArg(),
                mox.IgnoreArg(), mox.IgnoreArg()).AndReturn({'id': 0})
        self.mox.ReplayAll()

        network = dict(networks[0])
        network['vpn_private_address'] = '192.168.0.2'
        self.network.allocate_fixed_ip(None, 0, network, vpn=True)

    def test_allocate_fixed_ip(self):
        self.mox.StubOutWithMock(db, 'fixed_ip_associate_pool')
        self.mox.StubOutWithMock(db, 'fixed_ip_update')
        self.mox.StubOutWithMock(db,
                              'virtual_interface_get_by_instance_and_network')

        db.fixed_ip_associate_pool(mox.IgnoreArg(),
                                   mox.IgnoreArg(),
                                   mox.IgnoreArg()).AndReturn('192.168.0.1')
        db.fixed_ip_update(mox.IgnoreArg(),
                           mox.IgnoreArg(),
                           mox.IgnoreArg())
        db.virtual_interface_get_by_instance_and_network(mox.IgnoreArg(),
                mox.IgnoreArg(), mox.IgnoreArg()).AndReturn({'id': 0})
        self.mox.ReplayAll()

        network = dict(networks[0])
        network['vpn_private_address'] = '192.168.0.2'
        self.network.allocate_fixed_ip(None, 0, network)

    def test_create_networks_too_big(self):
        self.assertRaises(ValueError, self.network.create_networks, None,
                          num_networks=4094, vlan_start=1)

    def test_create_networks_too_many(self):
        self.assertRaises(ValueError, self.network.create_networks, None,
                          num_networks=100, vlan_start=1,
                          cidr='192.168.0.1/24', network_size=100)


class CommonNetworkTestCase(test.TestCase):

    class FakeNetworkManager(network_manager.NetworkManager):
        """This NetworkManager doesn't call the base class so we can bypass all
        inherited service cruft and just perform unit tests.
        """

        class FakeDB:
            def fixed_ip_get_by_instance(self, context, instance_id):
                return [dict(address='10.0.0.0'),  dict(address='10.0.0.1'),
                        dict(address='10.0.0.2')]

        def __init__(self):
            self.db = self.FakeDB()
            self.deallocate_called = None

        def deallocate_fixed_ip(self, context, address):
            self.deallocate_called = address

    def test_remove_fixed_ip_from_instance(self):
        manager = self.FakeNetworkManager()
        manager.remove_fixed_ip_from_instance(None, 99, '10.0.0.1')

        self.assertEquals(manager.deallocate_called, '10.0.0.1')

    def test_remove_fixed_ip_from_instance_bad_input(self):
        manager = self.FakeNetworkManager()
        self.assertRaises(exception.FixedIpNotFoundForSpecificInstance,
                          manager.remove_fixed_ip_from_instance,
                          None, 99, 'bad input')
