#!/usr/bin/env python
#
# Tests for qmp command nbd-server-remove.
#
# Copyright (c) 2017 Virtuozzo International GmbH
#
# 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
# (at your option) 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, see <http://www.gnu.org/licenses/>.
#

import os
import sys
import iotests
import time
from iotests import qemu_img, qemu_io, filter_qemu_io, QemuIoInteractive

nbd_sock = 'nbd_sock'
nbd_uri = 'nbd+unix:///exp?socket=' + nbd_sock
disk = os.path.join(iotests.test_dir, 'disk')


class TestNbdServerRemove(iotests.QMPTestCase):
    def setUp(self):
        qemu_img('create', '-f', iotests.imgfmt, disk, '1M')

        self.vm = iotests.VM().add_drive(disk)
        self.vm.launch()

        address = {
            'type': 'unix',
            'data': {
                'path': nbd_sock
            }
        }

        result = self.vm.qmp('nbd-server-start', addr=address)
        self.assert_qmp(result, 'return', {})
        result = self.vm.qmp('nbd-server-add', device='drive0', name='exp')
        self.assert_qmp(result, 'return', {})

    def tearDown(self):
        self.vm.shutdown()
        os.remove(nbd_sock)
        os.remove(disk)

    def remove_export(self, name, mode=None):
        if mode is None:
            return self.vm.qmp('nbd-server-remove', name=name)
        else:
            return self.vm.qmp('nbd-server-remove', name=name, mode=mode)

    def assertExportNotFound(self, name):
        result = self.vm.qmp('nbd-server-remove', name=name)
        self.assert_qmp(result, 'error/desc', "Export 'exp' is not found")

    def assertExistingClients(self, result):
        self.assert_qmp(result, 'error/desc', "export 'exp' still in use")

    def assertReadOk(self, qemu_io_output):
        self.assertEqual(
                filter_qemu_io(qemu_io_output).strip(),
                'read 512/512 bytes at offset 0\n' +
                '512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)')

    def assertReadFailed(self, qemu_io_output):
        self.assertEqual(filter_qemu_io(qemu_io_output).strip(),
                         'read failed: Input/output error')

    def assertConnectFailed(self, qemu_io_output):
        self.assertEqual(filter_qemu_io(qemu_io_output).strip(),
                         "can't open device " + nbd_uri +
                         ": Requested export not available\n"
                         "server reported: export 'exp' not present")

    def do_test_connect_after_remove(self, mode=None):
        args = ('-r', '-f', 'raw', '-c', 'read 0 512', nbd_uri)
        self.assertReadOk(qemu_io(*args))

        result = self.remove_export('exp', mode)
        self.assert_qmp(result, 'return', {})

        self.assertExportNotFound('exp')
        self.assertConnectFailed(qemu_io(*args))

    def test_connect_after_remove_default(self):
        self.do_test_connect_after_remove()

    def test_connect_after_remove_safe(self):
        self.do_test_connect_after_remove('safe')

    def test_connect_after_remove_force(self):
        self.do_test_connect_after_remove('hard')

    def do_test_remove_during_connect_safe(self, mode=None):
        qio = QemuIoInteractive('-r', '-f', 'raw', nbd_uri)
        self.assertReadOk(qio.cmd('read 0 512'))

        result = self.remove_export('exp', mode)
        self.assertExistingClients(result)

        self.assertReadOk(qio.cmd('read 0 512'))

        qio.close()

        result = self.remove_export('exp', mode)
        self.assert_qmp(result, 'return', {})

        self.assertExportNotFound('exp')

    def test_remove_during_connect_default(self):
        self.do_test_remove_during_connect_safe()

    def test_remove_during_connect_safe(self):
        self.do_test_remove_during_connect_safe('safe')

    def test_remove_during_connect_hard(self):
        qio = QemuIoInteractive('-r', '-f', 'raw', nbd_uri)
        self.assertReadOk(qio.cmd('read 0 512'))

        result = self.remove_export('exp', 'hard')
        self.assert_qmp(result, 'return', {})

        self.assertReadFailed(qio.cmd('read 0 512'))
        self.assertExportNotFound('exp')

        qio.close()

    def test_remove_during_connect_safe_hard(self):
        qio = QemuIoInteractive('-r', '-f', 'raw', nbd_uri)
        self.assertReadOk(qio.cmd('read 0 512'))

        result = self.remove_export('exp', 'safe')
        self.assertExistingClients(result)

        self.assertReadOk(qio.cmd('read 0 512'))

        result = self.remove_export('exp', 'hard')
        self.assert_qmp(result, 'return', {})

        self.assertExportNotFound('exp')
        self.assertReadFailed(qio.cmd('read 0 512'))
        qio.close()


if __name__ == '__main__':
    iotests.main()