# Copyright 2013 NEC Corporation
# 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.

import time

import testtools

from tempest.common.utils import data_utils
from tempest import config
from tempest import exceptions
from tempest.openstack.common import log as logging
from tempest.scenario import manager
import tempest.test

CONF = config.CONF

LOG = logging.getLogger(__name__)


class TestStampPattern(manager.ScenarioTest):
    """
    This test is for snapshotting an instance/volume and attaching the volume
    created from snapshot to the instance booted from snapshot.
    The following is the scenario outline:
    1. Boot an instance "instance1"
    2. Create a volume "volume1"
    3. Attach volume1 to instance1
    4. Create a filesystem on volume1
    5. Mount volume1
    6. Create a file which timestamp is written in volume1
    7. Unmount volume1
    8. Detach volume1 from instance1
    9. Get a snapshot "snapshot_from_volume" of volume1
    10. Get a snapshot "snapshot_from_instance" of instance1
    11. Boot an instance "instance2" from snapshot_from_instance
    12. Create a volume "volume2"  from snapshot_from_volume
    13. Attach volume2 to instance2
    14. Check the existence of a file which created at 6. in volume2
    """

    @classmethod
    def resource_setup(cls):
        if not CONF.volume_feature_enabled.snapshot:
            raise cls.skipException("Cinder volume snapshots are disabled")
        super(TestStampPattern, cls).resource_setup()

    def _wait_for_volume_snapshot_status(self, volume_snapshot, status):
        self.snapshots_client.wait_for_snapshot_status(volume_snapshot['id'],
                                                       status)

    def _boot_image(self, image_id):
        security_groups = [{'name': self.security_group['name']}]
        create_kwargs = {
            'key_name': self.keypair['name'],
            'security_groups': security_groups
        }
        return self.create_server(image=image_id, create_kwargs=create_kwargs)

    def _add_keypair(self):
        self.keypair = self.create_keypair()

    def _ssh_to_server(self, server_or_ip):
        return self.get_remote_client(server_or_ip)

    def _create_volume_snapshot(self, volume):
        snapshot_name = data_utils.rand_name('scenario-snapshot-')
        _, snapshot = self.snapshots_client.create_snapshot(
            volume['id'], display_name=snapshot_name)

        def cleaner():
            self.snapshots_client.delete_snapshot(snapshot['id'])
            try:
                while self.snapshots_client.get_snapshot(snapshot['id']):
                    time.sleep(1)
            except exceptions.NotFound:
                pass
        self.addCleanup(cleaner)
        self._wait_for_volume_status(volume, 'available')
        self.snapshots_client.wait_for_snapshot_status(snapshot['id'],
                                                       'available')
        self.assertEqual(snapshot_name, snapshot['display_name'])
        return snapshot

    def _wait_for_volume_status(self, volume, status):
        self.volumes_client.wait_for_volume_status(volume['id'], status)

    def _create_volume(self, snapshot_id=None):
        return self.create_volume(snapshot_id=snapshot_id)

    def _attach_volume(self, server, volume):
        # TODO(andreaf) we should use device from config instead if vdb
        _, attached_volume = self.servers_client.attach_volume(
            server['id'], volume['id'], device='/dev/vdb')
        self.assertEqual(volume['id'], attached_volume['id'])
        self._wait_for_volume_status(attached_volume, 'in-use')

    def _detach_volume(self, server, volume):
        self.servers_client.detach_volume(server['id'], volume['id'])
        self._wait_for_volume_status(volume, 'available')

    def _wait_for_volume_available_on_the_system(self, server_or_ip):
        ssh = self.get_remote_client(server_or_ip)

        def _func():
            part = ssh.get_partitions()
            LOG.debug("Partitions:%s" % part)
            return 'vdb' in part

        if not tempest.test.call_until_true(_func,
                                            CONF.compute.build_timeout,
                                            CONF.compute.build_interval):
            raise exceptions.TimeoutException

    def _create_timestamp(self, server_or_ip):
        ssh_client = self._ssh_to_server(server_or_ip)
        ssh_client.exec_command('sudo /usr/sbin/mkfs.ext4 /dev/vdb')
        ssh_client.exec_command('sudo mount /dev/vdb /mnt')
        ssh_client.exec_command('sudo sh -c "date > /mnt/timestamp;sync"')
        self.timestamp = ssh_client.exec_command('sudo cat /mnt/timestamp')
        ssh_client.exec_command('sudo umount /mnt')

    def _check_timestamp(self, server_or_ip):
        ssh_client = self._ssh_to_server(server_or_ip)
        ssh_client.exec_command('sudo mount /dev/vdb /mnt')
        got_timestamp = ssh_client.exec_command('sudo cat /mnt/timestamp')
        self.assertEqual(self.timestamp, got_timestamp)

    @tempest.test.skip_because(bug="1205344")
    @testtools.skipUnless(CONF.compute_feature_enabled.snapshot,
                          'Snapshotting is not available.')
    @tempest.test.services('compute', 'network', 'volume', 'image')
    def test_stamp_pattern(self):
        # prepare for booting a instance
        self._add_keypair()
        self.security_group = self._create_security_group()

        # boot an instance and create a timestamp file in it
        volume = self._create_volume()
        server = self._boot_image(CONF.compute.image_ref)

        # create and add floating IP to server1
        if CONF.compute.use_floatingip_for_ssh:
            floating_ip_for_server = self.create_floating_ip(server)
            ip_for_server = floating_ip_for_server['ip']
        else:
            ip_for_server = server

        self._attach_volume(server, volume)
        self._wait_for_volume_available_on_the_system(ip_for_server)
        self._create_timestamp(ip_for_server)
        self._detach_volume(server, volume)

        # snapshot the volume
        volume_snapshot = self._create_volume_snapshot(volume)

        # snapshot the instance
        snapshot_image = self.create_server_snapshot(server=server)

        # create second volume from the snapshot(volume2)
        volume_from_snapshot = self._create_volume(
            snapshot_id=volume_snapshot['id'])

        # boot second instance from the snapshot(instance2)
        server_from_snapshot = self._boot_image(snapshot_image['id'])

        # create and add floating IP to server_from_snapshot
        if CONF.compute.use_floatingip_for_ssh:
            floating_ip_for_snapshot = self.create_floating_ip(
                server_from_snapshot)
            ip_for_snapshot = floating_ip_for_snapshot['ip']
        else:
            ip_for_snapshot = server_from_snapshot

        # attach volume2 to instance2
        self._attach_volume(server_from_snapshot, volume_from_snapshot)
        self._wait_for_volume_available_on_the_system(ip_for_snapshot)

        # check the existence of the timestamp file in the volume2
        self._check_timestamp(ip_for_snapshot)