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#  Copyright (C) 2017-2018  Red Hat, Inc. <http://www.redhat.com>
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License along
#  with this program; if not, write to the Free Software Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

"""
    Description:
        The purpose of this test case is to validate Snapshot
        activation and deactivation.
        Pre-Activate, After Activate and After Deactivate
"""
from glusto.core import Glusto as g
from glustolibs.gluster.exceptions import ExecutionError
from glustolibs.gluster.gluster_base_class import GlusterBaseClass, runs_on
from glustolibs.gluster.snap_ops import (snap_create,
                                         snap_delete_all,
                                         snap_activate,
                                         snap_deactivate,
                                         get_snap_info_by_snapname,
                                         get_snap_status_by_snapname)


@runs_on([['replicated', 'distributed', 'distributed-replicated',
           'dispersed', 'distributed-dispersed'],
          ['glusterfs']])
class TestActivateDeactivate(GlusterBaseClass):
    @classmethod
    def setUpClass(cls):
        """
        setup volume and initialize necessary variables
        """

        GlusterBaseClass.setUpClass.im_func(cls)
        g.log.info("Starting %s:", cls.__name__)
        # Setup volume and mount
        g.log.info("Starting to Setup Volume")
        ret = cls.setup_volume()
        if not ret:
            raise ExecutionError("Failed to Setup_Volume")
        g.log.info("Successful in Setup Volume")

    def tearDown(self):
        """
        tearDown for every test
        """
        ret, _, _ = snap_delete_all(self.mnode)
        if ret != 0:
            raise ExecutionError("Snapshot Delete Failed")
        g.log.info("Successfully deleted all snapshots")
        # Calling GlusterBaseClass tearDown
        GlusterBaseClass.tearDown.im_func(self)

    @classmethod
    def tearDownClass(cls):
        """
        Clean up the volume & mount
        """
        # stopping the volume and clean up the volume
        g.log.info("Starting to Cleanup Volume")
        ret = cls.cleanup_volume()
        if not ret:
            raise ExecutionError("Failed to Cleanup Volume and mount")
        g.log.info("Successful in Cleanup Volume and mount")

        # calling GlusterBaseClass tearDownClass
        GlusterBaseClass.tearDownClass.im_func(cls)

    def test_activate_deactivate(self):
        # pylint: disable=too-many-branches, too-many-statements
        """
        Verifying Snapshot activation/deactivation functionality.
        """
        snap_name = 'snap_%s' % self.volname
        # Create Snapshot
        g.log.info("Starting to Create Snapshot %s", snap_name)
        ret, _, _ = snap_create(self.mnode, self.volname,
                                snap_name)
        self.assertEqual(ret, 0, "Snapshot Creation failed"
                         " for %s" % snap_name)
        g.log.info("Snapshot %s of volume %s created"
                   " successfully", snap_name, self.volname)

        # Validate Snapshot Info Before Activation
        ret = get_snap_info_by_snapname(self.mnode, snap_name)
        if ret is None:
            raise ExecutionError("Failed to Fetch Snapshot"
                                 "info for %s" % snap_name)
        g.log.info("Snapshot info Success"
                   "for %s", ret['snapVolume']['status'])
        if ret['snapVolume']['status'] != 'Stopped':
            raise ExecutionError("Unexpected: "
                                 "Snapshot %s Status is in "
                                 "Started State" % snap_name)
        g.log.info("Expected: Snapshot is in Stopped state "
                   "as it is not Activated")

        # Validate Snapshot Status Before Activation
        ret = get_snap_status_by_snapname(self.mnode, snap_name)
        if ret is None:
            raise ExecutionError("Failed to Fetch Snapshot"
                                 "status for %s" % snap_name)
        g.log.info("Snapshot Status Success for %s", snap_name)
        for brick in ret['volume']['brick']:
            if brick['pid'] != 'N/A':
                raise ExecutionError("Brick Pid %s available for %s"
                                     % brick['pid'], brick['path'])
        g.log.info("Deactivated Snapshot Brick PID N/A as Expected")

        # Activate Snapshot
        g.log.info("Starting to Activate %s", snap_name)
        ret, _, _ = snap_activate(self.mnode, snap_name)
        self.assertEqual(ret, 0, "Snapshot Activation Failed"
                         " for %s" % snap_name)
        g.log.info("Snapshot %s Activated Successfully", snap_name)

        # Validate Snapshot Info After Activation
        g.log.info("Validate snapshot info")
        snap_info = get_snap_info_by_snapname(self.mnode, snap_name)
        self.assertEqual(snap_info['snapVolume']['status'], "Started",
                         "Failed to Fetch Snapshot"
                         "info after activate "
                         "for %s" % snap_name)
        g.log.info("Snapshot info Success ")

        # Validate Snaphot Status After Activation
        g.log.info("Validate snapshot status")
        ret = get_snap_status_by_snapname(self.mnode, snap_name)
        for brick in ret['volume']['brick']:
            self.assertNotEqual(brick['pid'], 'N/A', "Brick Path "
                                "%s  Not Available "
                                "for Activated Snapshot %s"
                                % (brick['path'], snap_name))
        g.log.info("Activated Snapshot Brick Path "
                   "Available as Expected")

        # Validation After Snapshot Deactivate
        g.log.info("Starting to Deactivate %s", snap_name)
        ret, _, _ = snap_deactivate(self.mnode, snap_name)
        self.assertEqual(ret, 0, "Snapshot Deactivation Failed"
                         " for %s" % snap_name)
        g.log.info("Snapshot %s Deactivation Successfully", snap_name)

        # Validate Snapshot Info After Deactivation
        ret = get_snap_info_by_snapname(self.mnode, snap_name)
        self.assertEqual(ret['snapVolume']['status'], 'Stopped',
                         "Snapshot Status is not "
                         "in Stopped State")
        g.log.info("Snapshot is in Stopped state after Deactivation")

        # Validate Snaphot Status After Activation
        g.log.info("Validate snapshot status")
        ret = get_snap_status_by_snapname(self.mnode, snap_name)
        for brick in ret['volume']['brick']:
            self.assertEqual(brick['pid'], 'N/A', "Deactivated "
                             "Snapshot Brick "
                             "Pid %s available "
                             "for %s"
                             % (brick['pid'], brick['path']))
        g.log.info("Deactivated Snapshot Brick PID N/A as Expected")