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# Copyright 2020 Catalyst Cloud
#
# 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 re
from oslo_concurrency import processutils
from oslo_config import cfg
from oslo_log import log as logging
from backup.drivers import mysql_base
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
class MariaBackup(mysql_base.MySQLBaseRunner):
"""Implementation of Backup and Restore using mariadb-backup."""
restore_cmd = ('mbstream -x -C %(restore_location)s')
prepare_cmd = 'mariadb-backup --prepare --target-dir=%(restore_location)s'
def __init__(self, *args, **kwargs):
super(MariaBackup, self).__init__(*args, **kwargs)
self.backup_log = '/tmp/mariadb-backup.log'
self._gzip = True
@property
def cmd(self):
cmd = ('mariadb-backup --backup --stream=xbstream ' +
self.user_and_pass)
return cmd
def check_restore_process(self):
LOG.info('Checking return code of mbstream restore process.')
return_code = self.process.returncode
if return_code != 0:
LOG.error('mbstream exited with %s', return_code)
return False
return True
def post_restore(self):
"""Prepare after data restore."""
LOG.info("Running prepare command: %s.", self.prepare_command)
stdout, stderr = processutils.execute(*self.prepare_command.split())
LOG.info("The command: %s : stdout: %s, stderr: %s",
self.prepare_command, stdout, stderr)
LOG.info("Checking prepare log")
if not stderr:
msg = "Empty prepare log file"
raise Exception(msg)
last_line = stderr.splitlines()[-1].strip()
if not re.search('completed OK!', last_line):
msg = "Prepare did not complete successfully"
raise Exception(msg)
class MariaBackupIncremental(MariaBackup):
"""Incremental backup and restore using mariadb-backup."""
incremental_prep = ('mariadb-backup --prepare '
'--target-dir=%(restore_location)s '
'%(incremental_args)s')
def __init__(self, *args, **kwargs):
if not kwargs.get('lsn'):
raise AttributeError('lsn attribute missing')
self.parent_location = kwargs.pop('parent_location', '')
self.parent_checksum = kwargs.pop('parent_checksum', '')
super(MariaBackupIncremental, self).__init__(*args, **kwargs)
@property
def cmd(self):
cmd = (
'mariadb-backup --backup --stream=xbstream'
' --incremental-lsn=%(lsn)s ' +
self.user_and_pass
)
LOG.info('cmd:{}'.format(cmd))
return cmd
def get_metadata(self):
meta = super(MariaBackupIncremental, self).get_metadata()
meta.update({
'parent_location': self.parent_location,
'parent_checksum': self.parent_checksum,
})
return meta
def run_restore(self):
"""Run incremental restore."""
LOG.info('Running incremental restore')
self.incremental_restore(self.location, self.checksum)
return self.restore_content_length
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