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#  Copyright (C) 2016-2017  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:
        Test Cases in this module tests the client side quorum.
"""


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.volume_libs import (
    set_volume_options, get_subvols)
from glustolibs.misc.misc_libs import upload_scripts
from glustolibs.gluster.brick_libs import bring_bricks_offline
from glustolibs.io.utils import (validate_io_procs,
                                 is_io_procs_fail_with_rofs)


@runs_on([['replicated', 'distributed-replicated'],
          ['glusterfs', 'nfs', 'cifs']])
class ClientSideQuorumTests(GlusterBaseClass):
    """
    ClientSideQuorumTests contains tests which verifies the
    client side quorum Test Cases
    """
    @classmethod
    def setUpClass(cls):
        """
        Upload the necessary scripts to run tests.
        """

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

        # Upload io scripts for running IO on mounts
        g.log.info("Upload io scripts to clients %s for running IO on "
                   "mounts", cls.clients)
        script_abs_path = "/usr/share/glustolibs/io/scripts/file_dir_ops.py"
        cls.script_upload_path = "/usr/share/glustolibs/io/scripts/" \
                                 "file_dir_ops.py"
        ret = upload_scripts(cls.clients, script_abs_path)
        if not ret:
            raise ExecutionError("Failed to upload IO scripts to clients")

    def setUp(self):
        """
        setUp method for every test
        """

        # calling GlusterBaseClass setUp
        GlusterBaseClass.setUp.im_func(self)

        # Setup Volume and Mount Volume
        g.log.info("Starting to Setup Volume %s" % self.volname)
        ret = self.setup_volume_and_mount_volume(self.mounts)
        if not ret:
            raise ExecutionError("Failed to Setup_Volume and Mount_Volume")
        g.log.info("Successful in Setup Volume and Mount Volume")

    def tearDown(self):
        """
        tearDown for every test
        """

        # stopping the volume
        g.log.info("Starting to Unmount Volume and Cleanup Volume")
        ret = self.unmount_volume_and_cleanup_volume(mounts=self.mounts)
        if not ret:
            raise ExecutionError("Failed to Unmount Volume and Cleanup Volume")
        g.log.info("Successful in Unmount Volume and Cleanup Volume")

        # Calling GlusterBaseClass tearDown
        GlusterBaseClass.tearDown.im_func(self)

    def test_client_side_quorum_with_auto_option(self):
        """
        Test Script to verify the Client Side Quorum with auto option

        * set cluster.quorum-type to auto.
        * start I/O from the mount point.
        * kill 2 of the brick process from the each and every replica set
        * perform ops

        """
        # set cluster.quorum-type to auto
        options = {"cluster.quorum-type": "auto"}
        g.log.info("setting cluster.quorum-type to auto on "
                   "volume %s" % self.volname)
        ret = set_volume_options(self.mnode, self.volname, options)
        self.assertTrue(ret, ("Unable to set volume option %s for"
                              "volume %s" % (options, self.volname)))
        g.log.info("Sucessfully set %s for volume %s"
                   % (options, self.volname))

        # write files on all mounts
        g.log.info("Starting IO on all mounts...")
        g.log.info("mounts: %s" % self.mounts)
        all_mounts_procs = []
        for mount_obj in self.mounts:
            cmd = ("python %s create_files "
                   "-f 10 --base-file-name file %s" % (self.script_upload_path,
                                                       mount_obj.mountpoint))
            proc = g.run_async(mount_obj.client_system, cmd,
                               user=mount_obj.user)
            all_mounts_procs.append(proc)

        # Validate IO
        g.log.info("Validating IO on mounts")
        ret = validate_io_procs(all_mounts_procs, self.mounts)
        self.assertTrue(ret, "IO failed on some of the clients")
        g.log.info("IO is successful on all mounts")

        # get the subvolumes
        g.log.info("Starting to get sub-volumes for volume %s" % self.volname)
        subvols_dict = get_subvols(self.mnode, self.volname)
        num_subvols = len(subvols_dict['volume_subvols'])
        g.log.info("Number of subvolumes in volume %s:" % num_subvols)

        # bring bricks offline( 2 bricks ) for all the subvolumes
        for i in range(0, num_subvols):
            subvol_brick_list = subvols_dict['volume_subvols'][i]
            g.log.info("sub-volume %s brick list : %s"
                       % (i, subvol_brick_list))
            # For volume type: 1 * 2, bring 1 brick offline
            if len(subvol_brick_list) == 2:
                bricks_to_bring_offline = subvol_brick_list[0:1]
            else:
                bricks_to_bring_offline = subvol_brick_list[0:2]
            g.log.info("Going to bring down the brick process "
                       "for %s" % bricks_to_bring_offline)
            ret = bring_bricks_offline(self.volname, bricks_to_bring_offline)
            self.assertTrue(ret, ("Failed to bring down the bricks. Please "
                                  "check the log file for more details."))
            g.log.info("Brought down the brick process "
                       "for %s succesfully" % bricks_to_bring_offline)

        # create 2 files named newfile0.txt and newfile1.txt
        g.log.info("Start creating 2 files on all mounts...")
        all_mounts_procs = []
        for mount_obj in self.mounts:
            cmd = ("python %s create_files "
                   "-f 2 --base-file-name newfile %s" %
                   (self.script_upload_path, mount_obj.mountpoint))
            proc = g.run_async(mount_obj.client_system, cmd,
                               user=mount_obj.user)
            all_mounts_procs.append(proc)

        # Validate IO
        g.log.info("Validating whether IO failed with read-only filesystem")
        ret = is_io_procs_fail_with_rofs(self, all_mounts_procs, self.mounts)
        self.assertTrue(ret, ("Unexpected error and IO successfull"
                              " on read-only filesystem"))
        g.log.info("EXPECTED: Read-only file system in IO while creating file")

        # create directory user1
        g.log.info("Start creating directory on all mounts...")
        all_mounts_procs = []
        for mount_obj in self.mounts:
            cmd = ("python %s create_deep_dir "
                   "%s" % (self.script_upload_path, mount_obj.mountpoint))
            proc = g.run_async(mount_obj.client_system, cmd,
                               user=mount_obj.user)
            all_mounts_procs.append(proc)

        # Validate IO
        g.log.info("Validating whether IO failed with read-only filesystem")
        ret = is_io_procs_fail_with_rofs(self, all_mounts_procs, self.mounts)
        self.assertTrue(ret, ("Unexpected error and IO successfull"
                              " on read-only filesystem"))
        g.log.info("EXPECTED: Read-only file system in IO while"
                   " creating directory")

        # create h/w link to file
        g.log.info("Start creating hard link for file0.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "ln %s/file0.txt %s/file0.txt_hwlink" \
                  % (mount_obj.mountpoint, mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertTrue(ret, ("Unexpected error and creating hard link"
                                  " successful on read-only filesystem"))
            self.assertIn("Read-only file system",
                          err, "Read-only filesystem not found in "
                               "IO while truncating file")
            g.log.info("EXPECTED: Read-only file system in IO")

        # create s/w link
        g.log.info("Start creating soft link for file1.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "ln -s %s/file1.txt %s/file1.txt_swlink" %\
                  (mount_obj.mountpoint, mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertTrue(ret, ("Unexpected error and creating soft link"
                                  " successful on read-only filesystem"))
            self.assertIn("Read-only file system",
                          err, "Read-only filesystem not found in "
                               "IO while truncating file")
            g.log.info("EXPECTED: Read-only file system in IO")

        # append to file
        g.log.info("Appending to file1.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "cat %s/file0.txt >> %s/file1.txt" %\
                  (mount_obj.mountpoint, mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertTrue(ret, ("Unexpected error and append successful"
                                  " on read-only filesystem"))
            self.assertIn("Read-only file system",
                          err, "Read-only filesystem not found in "
                               "IO while truncating file")
            g.log.info("EXPECTED: Read-only file system in IO")

        # modify the file
        g.log.info("Modifying file1.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "echo 'Modify Contents' > %s/file1.txt"\
                  % (mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertTrue(ret, ("Unexpected error and modifying successful"
                                  " on read-only filesystem"))
            self.assertIn("Read-only file system",
                          err, "Read-only filesystem not found in "
                               "IO while truncating file")
            g.log.info("EXPECTED: Read-only file system in IO")

        # truncate the file
        g.log.info("Truncating file1.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "truncate -s 0 %s/file1.txt" % (mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertTrue(ret, ("Unexpected error and truncating file"
                                  " successful on read-only filesystem"))
            self.assertIn("Read-only file system",
                          err, "Read-only filesystem not found in "
                               "IO while truncating file")
            g.log.info("EXPECTED: Read-only file system in IO")

        # read the file
        g.log.info("Starting reading files on all mounts")
        all_mounts_procs = []
        for mount_obj in self.mounts:
            cmd = ("python %s read "
                   "%s" % (self.script_upload_path, mount_obj.mountpoint))
            proc = g.run_async(mount_obj.client_system, cmd,
                               user=mount_obj.user)
            all_mounts_procs.append(proc)

        # Validate IO
        g.log.info("validating IO on all mounts")
        ret = validate_io_procs(all_mounts_procs, self.mounts)
        self.assertTrue(ret, "Reads failed on some of the clients")
        g.log.info("Reads successful on all mounts")

        # stat on file
        g.log.info("stat on file1.txt on all mounts")
        for mount_obj in self.mounts:
            cmd = "stat %s/file1.txt" % (mount_obj.mountpoint)
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertFalse(ret, ("Unexpected error and stat on file fails"
                                   " on read-only filesystem"))
            g.log.info("stat on file is successfull on read-only filesystem")

        # stat on dir
        g.log.info("stat on directory on all mounts")
        for mount_obj in self.mounts:
            cmd = ("python %s stat %s"
                   % (self.script_upload_path, mount_obj.mountpoint))
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertFalse(ret, ("Unexpected error and stat on directory"
                                   " fails on read-only filesystem"))
            g.log.info("stat on dir is successfull on read-only filesystem")

        # ls on mount point
        g.log.info("ls on mount point on all mounts")
        for mount_obj in self.mounts:
            cmd = ("python %s ls %s"
                   % (self.script_upload_path, mount_obj.mountpoint))
            ret, out, err = g.run(mount_obj.client_system, cmd)
            self.assertFalse(ret, ("Unexpected error and listing file fails"
                                   " on read-only filesystem"))
            g.log.info("listing files is successfull on read-only filesystem")