1#!/usr/bin/env python3
2# group: rw
3#
4# Test nbd reconnect
5#
6# Copyright (c) 2019 Virtuozzo International GmbH.
7#
8# This program is free software; you can redistribute it and/or modify
9# it under the terms of the GNU General Public License as published by
10# the Free Software Foundation; either version 2 of the License, or
11# (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the GNU General Public License
19# along with this program.  If not, see <http://www.gnu.org/licenses/>.
20#
21
22import time
23import os
24
25import iotests
26from iotests import qemu_img_create, file_path, qemu_nbd_popen
27
28disk_a, disk_b, nbd_sock = file_path('disk_a', 'disk_b', 'nbd-sock')
29nbd_uri = 'nbd+unix:///?socket=' + nbd_sock
30wait_limit = 3.0
31wait_step = 0.2
32
33
34class TestNbdReconnect(iotests.QMPTestCase):
35    def init_vm(self, disk_size):
36        qemu_img_create('-f', iotests.imgfmt, disk_a, str(disk_size))
37        qemu_img_create('-f', iotests.imgfmt, disk_b, str(disk_size))
38        self.vm = iotests.VM().add_drive(disk_a)
39        self.vm.launch()
40        self.vm.hmp_qemu_io('drive0', 'write 0 {}'.format(disk_size))
41
42    def tearDown(self):
43        self.vm.shutdown()
44        os.remove(disk_a)
45        os.remove(disk_b)
46
47    def start_job(self, job):
48        """Stat job with nbd target and kill the server"""
49        assert job in ('blockdev-backup', 'blockdev-mirror')
50        with qemu_nbd_popen('-k', nbd_sock, '-f', iotests.imgfmt, disk_b):
51            result = self.vm.qmp('blockdev-add',
52                                 **{'node_name': 'backup0',
53                                    'driver': 'raw',
54                                    'file': {'driver': 'nbd',
55                                             'server': {'type': 'unix',
56                                                        'path': nbd_sock},
57                                             'reconnect-delay': 10}})
58            self.assert_qmp(result, 'return', {})
59            result = self.vm.qmp(job, device='drive0',
60                                 sync='full', target='backup0',
61                                 speed=(1 * 1024 * 1024))
62            self.assert_qmp(result, 'return', {})
63
64            # Wait for some progress
65            t = 0.0
66            while t < wait_limit:
67                jobs = self.vm.qmp('query-block-jobs')['return']
68                if jobs and jobs[0]['offset'] > 0:
69                    break
70                time.sleep(wait_step)
71                t += wait_step
72
73            self.assertTrue(jobs and jobs[0]['offset'] > 0)  # job started
74
75        jobs = self.vm.qmp('query-block-jobs')['return']
76        # Check that job is still in progress
77        self.assertTrue(jobs)
78        self.assertTrue(jobs[0]['offset'] < jobs[0]['len'])
79
80        result = self.vm.qmp('block-job-set-speed', device='drive0', speed=0)
81        self.assert_qmp(result, 'return', {})
82
83        # Emulate server down time for 1 second
84        time.sleep(1)
85
86    def test_backup(self):
87        size = 5 * 1024 * 1024
88        self.init_vm(size)
89        self.start_job('blockdev-backup')
90
91        with qemu_nbd_popen('-k', nbd_sock, '-f', iotests.imgfmt, disk_b):
92            e = self.vm.event_wait('BLOCK_JOB_COMPLETED')
93            self.assertEqual(e['data']['offset'], size)
94            result = self.vm.qmp('blockdev-del', node_name='backup0')
95            self.assert_qmp(result, 'return', {})
96
97    def cancel_job(self):
98        result = self.vm.qmp('block-job-cancel', device='drive0', force=True)
99        self.assert_qmp(result, 'return', {})
100
101        start_t = time.time()
102        self.vm.event_wait('BLOCK_JOB_CANCELLED')
103        delta_t = time.time() - start_t
104        self.assertTrue(delta_t < 2.0)
105
106    def test_mirror_cancel(self):
107        # Mirror speed limit doesn't work well enough, it seems that mirror
108        # will run many parallel requests anyway. MAX_IN_FLIGHT is 16 and
109        # MAX_IO_BYTES is 1M in mirror.c, so let's use 20M disk.
110        self.init_vm(20 * 1024 * 1024)
111        self.start_job('blockdev-mirror')
112        self.cancel_job()
113
114    def test_backup_cancel(self):
115        self.init_vm(5 * 1024 * 1024)
116        self.start_job('blockdev-backup')
117        self.cancel_job()
118
119
120if __name__ == '__main__':
121    iotests.main(supported_fmts=['qcow2'])
122