# Copyright (C) 2013 eNovance SAS <licensing@enovance.com>
#
# 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.

import copy

import mock
from oslo_config import cfg

from neutron.services.metering.drivers.iptables import iptables_driver
from neutron.tests import base


TEST_ROUTERS = [
    {'_metering_labels': [
        {'id': 'c5df2fe5-c600-4a2a-b2f4-c0fb6df73c83',
         'rules': [{
             'direction': 'ingress',
             'excluded': False,
             'id': '7f1a261f-2489-4ed1-870c-a62754501379',
             'metering_label_id': 'c5df2fe5-c600-4a2a-b2f4-c0fb6df73c83',
             'remote_ip_prefix': '10.0.0.0/24'}]}],
     'admin_state_up': True,
     'gw_port_id': '6d411f48-ecc7-45e0-9ece-3b5bdb54fcee',
     'id': '473ec392-1711-44e3-b008-3251ccfc5099',
     'name': 'router1',
     'status': 'ACTIVE',
     'tenant_id': '6c5f5d2a1fa2441e88e35422926f48e8'},
    {'_metering_labels': [
        {'id': 'eeef45da-c600-4a2a-b2f4-c0fb6df73c83',
         'rules': [{
             'direction': 'egress',
             'excluded': False,
             'id': 'fa2441e8-2489-4ed1-870c-a62754501379',
             'metering_label_id': 'eeef45da-c600-4a2a-b2f4-c0fb6df73c83',
             'remote_ip_prefix': '20.0.0.0/24'}]}],
     'admin_state_up': True,
     'gw_port_id': '7d411f48-ecc7-45e0-9ece-3b5bdb54fcee',
     'id': '373ec392-1711-44e3-b008-3251ccfc5099',
     'name': 'router2',
     'status': 'ACTIVE',
     'tenant_id': '6c5f5d2a1fa2441e88e35422926f48e8'},
]

TEST_ROUTERS_WITH_ONE_RULE = [
    {'_metering_labels': [
        {'id': 'c5df2fe5-c600-4a2a-b2f4-c0fb6df73c83',
         'rule': {
             'direction': 'ingress',
             'excluded': False,
             'id': '7f1a261f-2489-4ed1-870c-a62754501379',
             'metering_label_id': 'c5df2fe5-c600-4a2a-b2f4-c0fb6df73c83',
             'remote_ip_prefix': '30.0.0.0/24'}}],
     'admin_state_up': True,
     'gw_port_id': '6d411f48-ecc7-45e0-9ece-3b5bdb54fcee',
     'id': '473ec392-1711-44e3-b008-3251ccfc5099',
     'name': 'router1',
     'status': 'ACTIVE',
     'tenant_id': '6c5f5d2a1fa2441e88e35422926f48e8'},
    {'_metering_labels': [
        {'id': 'eeef45da-c600-4a2a-b2f4-c0fb6df73c83',
         'rule': {
             'direction': 'egress',
             'excluded': False,
             'id': 'fa2441e8-2489-4ed1-870c-a62754501379',
             'metering_label_id': 'eeef45da-c600-4a2a-b2f4-c0fb6df73c83',
             'remote_ip_prefix': '40.0.0.0/24'}}],
     'admin_state_up': True,
     'gw_port_id': '7d411f48-ecc7-45e0-9ece-3b5bdb54fcee',
     'id': '373ec392-1711-44e3-b008-3251ccfc5099',
     'name': 'router2',
     'status': 'ACTIVE',
     'tenant_id': '6c5f5d2a1fa2441e88e35422926f48e8'},
]


class IptablesDriverTestCase(base.BaseTestCase):
    def setUp(self):
        super(IptablesDriverTestCase, self).setUp()
        self.utils_exec_p = mock.patch(
            'neutron.agent.linux.utils.execute')
        self.utils_exec = self.utils_exec_p.start()
        self.iptables_cls_p = mock.patch(
            'neutron.agent.linux.iptables_manager.IptablesManager')
        self.iptables_cls = self.iptables_cls_p.start()
        self.iptables_inst = mock.Mock()
        self.v4filter_inst = mock.Mock()
        self.v6filter_inst = mock.Mock()
        self.v4filter_inst.chains = []
        self.v6filter_inst.chains = []
        self.iptables_inst.ipv4 = {'filter': self.v4filter_inst}
        self.iptables_inst.ipv6 = {'filter': self.v6filter_inst}
        self.iptables_cls.return_value = self.iptables_inst
        cfg.CONF.set_override('interface_driver',
                              'neutron.agent.linux.interface.NullDriver')
        self.metering = iptables_driver.IptablesMeteringDriver('metering',
                                                               cfg.CONF)

    def test_create_stateless_iptables_manager(self):
        routers = TEST_ROUTERS[:1]
        self.metering.add_metering_label(None, routers)
        self.iptables_cls.assert_called_with(
            binary_name=mock.ANY,
            namespace=mock.ANY,
            state_less=True,
            use_ipv6=mock.ANY)

    def test_add_metering_label(self):
        routers = TEST_ROUTERS[:1]

        self.metering.add_metering_label(None, routers)
        calls = [mock.call.add_chain('neutron-meter-l-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-c5df2fe5-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-c5df2fe5-c60',
                                    '',
                                    wrap=False)]

        self.v4filter_inst.assert_has_calls(calls)

    def test_process_metering_label_rules(self):
        self.metering.add_metering_label(None, TEST_ROUTERS)

        calls = [mock.call.add_chain('neutron-meter-l-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-c5df2fe5-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-c5df2fe5-c60',
                                    '',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-6d411f48-ec -s 10.0.0.0/24'
                                    ' -j neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False),
                 mock.call.add_chain('neutron-meter-l-eeef45da-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-eeef45da-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-eeef45da-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-eeef45da-c60',
                                    '',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-r-eeef45da-c60',
                                    '-o qg-7d411f48-ec -d 20.0.0.0/24'
                                    ' -j neutron-meter-l-eeef45da-c60',
                                    wrap=False, top=False)]

        self.v4filter_inst.assert_has_calls(calls)

    def test_add_metering_label_with_rules(self):
        routers = copy.deepcopy(TEST_ROUTERS)
        routers[1]['_metering_labels'][0]['rules'][0].update({
            'direction': 'ingress',
            'excluded': True,
        })

        self.metering.add_metering_label(None, routers)
        calls = [mock.call.add_chain('neutron-meter-l-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-c5df2fe5-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-c5df2fe5-c60',
                                    '',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-6d411f48-ec -s 10.0.0.0/24'
                                    ' -j neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False),
                 mock.call.add_chain('neutron-meter-l-eeef45da-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-eeef45da-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-eeef45da-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-eeef45da-c60',
                                    '',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-r-eeef45da-c60',
                                    '-i qg-7d411f48-ec -s 20.0.0.0/24'
                                    ' -j RETURN',
                                    wrap=False, top=True)]

        self.v4filter_inst.assert_has_calls(calls)

    def test_update_metering_label_rules(self):
        routers = TEST_ROUTERS[:1]

        self.metering.add_metering_label(None, routers)

        updates = copy.deepcopy(routers)
        updates[0]['_metering_labels'][0]['rules'] = [{
            'direction': 'egress',
            'excluded': True,
            'id': '7f1a261f-2489-4ed1-870c-a62754501379',
            'metering_label_id': 'c5df2fe5-c600-4a2a-b2f4-c0fb6df73c83',
            'remote_ip_prefix': '10.0.0.0/24'},
            {'direction': 'ingress',
             'excluded': False,
             'id': '6f1a261f-2489-4ed1-870c-a62754501379',
             'metering_label_id': 'c5df2fe5-c600-4a2a-b2f4-c0fb6df73c83',
             'remote_ip_prefix': '20.0.0.0/24'}]

        self.metering.update_metering_label_rules(None, updates)

        calls = [mock.call.add_chain('neutron-meter-l-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-c5df2fe5-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-c5df2fe5-c60',
                                    '',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-6d411f48-ec -s 10.0.0.0/24'
                                    ' -j neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False),
                 mock.call.empty_chain('neutron-meter-r-c5df2fe5-c60',
                                       wrap=False),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-o qg-6d411f48-ec -d 10.0.0.0/24'
                                    ' -j RETURN',
                                    wrap=False, top=True),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-6d411f48-ec -s 20.0.0.0/24 -j '
                                    'neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False)]

        self.v4filter_inst.assert_has_calls(calls)

    def test_remove_metering_label_rule_in_update(self):
        routers = copy.deepcopy(TEST_ROUTERS[:1])
        routers[0]['_metering_labels'][0]['rules'].append({
            'direction': 'ingress',
            'excluded': False,
            'id': 'aaaa261f-2489-4ed1-870c-a62754501379',
            'metering_label_id': 'c5df2fe5-c600-4a2a-b2f4-c0fb6df73c83',
            'remote_ip_prefix': '20.0.0.0/24',
        })

        self.metering.add_metering_label(None, routers)

        del routers[0]['_metering_labels'][0]['rules'][1]

        self.metering.update_metering_label_rules(None, routers)
        calls = [mock.call.add_chain('neutron-meter-l-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-c5df2fe5-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-c5df2fe5-c60',
                                    '',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-6d411f48-ec -s 10.0.0.0/24'
                                    ' -j neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-6d411f48-ec -s 20.0.0.0/24'
                                    ' -j neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False),
                 mock.call.empty_chain('neutron-meter-r-c5df2fe5-c60',
                                       wrap=False),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-6d411f48-ec -s 10.0.0.0/24'
                                    ' -j neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False)]

        self.v4filter_inst.assert_has_calls(calls)

    def test_add_metering_label_rule(self):
        new_routers_rules = TEST_ROUTERS_WITH_ONE_RULE
        self.metering.update_routers(None, TEST_ROUTERS)
        self.metering.add_metering_label_rule(None, new_routers_rules)
        calls = [
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-6d411f48-ec -s 30.0.0.0/24'
                                    ' -j neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False),
                 mock.call.add_rule('neutron-meter-r-eeef45da-c60',
                                    '-o qg-7d411f48-ec -d 40.0.0.0/24'
                                    ' -j neutron-meter-l-eeef45da-c60',
                                    wrap=False, top=False),

                ]
        self.v4filter_inst.assert_has_calls(calls)

    def test_remove_metering_label_rule(self):
        new_routers_rules = TEST_ROUTERS_WITH_ONE_RULE
        self.metering.update_routers(None, TEST_ROUTERS)
        self.metering.add_metering_label_rule(None, new_routers_rules)
        self.metering.remove_metering_label_rule(None, new_routers_rules)
        calls = [
            mock.call.remove_rule('neutron-meter-r-c5df2fe5-c60',
                                  '-i qg-6d411f48-ec -s 30.0.0.0/24'
                                  ' -j neutron-meter-l-c5df2fe5-c60',
                                  wrap=False, top=False),
            mock.call.remove_rule('neutron-meter-r-eeef45da-c60',
                                  '-o qg-7d411f48-ec -d 40.0.0.0/24'
                                  ' -j neutron-meter-l-eeef45da-c60',
                                  wrap=False, top=False)
                ]
        self.v4filter_inst.assert_has_calls(calls)

    def test_remove_metering_label(self):
        routers = TEST_ROUTERS[:1]

        self.metering.add_metering_label(None, routers)
        self.metering.remove_metering_label(None, routers)
        calls = [mock.call.add_chain('neutron-meter-l-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-c5df2fe5-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-c5df2fe5-c60',
                                    '',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-6d411f48-ec -s 10.0.0.0/24'
                                    ' -j neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False),
                 mock.call.remove_chain('neutron-meter-l-c5df2fe5-c60',
                                        wrap=False),
                 mock.call.remove_chain('neutron-meter-r-c5df2fe5-c60',
                                        wrap=False)]

        self.v4filter_inst.assert_has_calls(calls)

    def test_update_routers(self):
        routers = copy.deepcopy(TEST_ROUTERS)
        routers[1]['_metering_labels'][0]['rules'][0].update({
            'direction': 'ingress',
            'excluded': True,
        })

        self.metering.add_metering_label(None, routers)

        updates = copy.deepcopy(routers)
        updates[0]['gw_port_id'] = '587b63c1-22a3-40b3-9834-486d1fb215a5'

        self.metering.update_routers(None, updates)
        calls = [mock.call.add_chain('neutron-meter-l-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-c5df2fe5-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-c5df2fe5-c60',
                                    '',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-6d411f48-ec -s 10.0.0.0/24'
                                    ' -j neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False),
                 mock.call.add_chain('neutron-meter-l-eeef45da-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-eeef45da-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-eeef45da-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-eeef45da-c60',
                                    '',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-r-eeef45da-c60',
                                    '-i qg-7d411f48-ec -s 20.0.0.0/24'
                                    ' -j RETURN',
                                    wrap=False, top=True),
                 mock.call.remove_chain('neutron-meter-l-c5df2fe5-c60',
                                        wrap=False),
                 mock.call.remove_chain('neutron-meter-r-c5df2fe5-c60',
                                        wrap=False),
                 mock.call.add_chain('neutron-meter-l-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_chain('neutron-meter-r-c5df2fe5-c60',
                                     wrap=False),
                 mock.call.add_rule('neutron-meter-FORWARD', '-j '
                                    'neutron-meter-r-c5df2fe5-c60',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-l-c5df2fe5-c60',
                                    '',
                                    wrap=False),
                 mock.call.add_rule('neutron-meter-r-c5df2fe5-c60',
                                    '-i qg-587b63c1-22 -s 10.0.0.0/24'
                                    ' -j neutron-meter-l-c5df2fe5-c60',
                                    wrap=False, top=False)]

        self.v4filter_inst.assert_has_calls(calls)

    def test_update_routers_removal(self):
        routers = TEST_ROUTERS

        self.metering.add_metering_label(None, routers)

        # Remove router id '373ec392-1711-44e3-b008-3251ccfc5099'
        updates = TEST_ROUTERS[:1]

        self.metering.update_routers(None, updates)
        calls = [mock.call.remove_chain('neutron-meter-l-eeef45da-c60',
                                        wrap=False),
                 mock.call.remove_chain('neutron-meter-r-eeef45da-c60',
                                        wrap=False)]

        self.v4filter_inst.assert_has_calls(calls)

    def test_get_traffic_counters_with_missing_chain(self):
        for r in TEST_ROUTERS:
            rm = iptables_driver.RouterWithMetering(self.metering.conf, r)
            rm.metering_labels = {r['_metering_labels'][0]['id']: 'fake'}
            self.metering.routers[r['id']] = rm

        mocked_method = self.iptables_cls.return_value.get_traffic_counters
        mocked_method.side_effect = [{'pkts': 1, 'bytes': 8},
                                     RuntimeError('Failed to find the chain')]

        counters = self.metering.get_traffic_counters(None, TEST_ROUTERS)
        expected_label_id = TEST_ROUTERS[0]['_metering_labels'][0]['id']
        self.assertIn(expected_label_id, counters)
        self.assertEqual(1, counters[expected_label_id]['pkts'])
        self.assertEqual(8, counters[expected_label_id]['bytes'])
