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# Copyright 2014 Tesora, Inc.
# All Rights Reserved.
#
# 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 csv
from trove.common import cfg
from trove.common import exception
from trove.common import utils
from trove.guestagent.backup.backupagent import BackupAgent
from trove.guestagent.common import operating_system
from trove.guestagent.strategies import backup
from trove.guestagent.strategies.replication import base
from trove.guestagent.strategies.storage import get_storage_strategy
from trove.openstack.common import log as logging
from trove.openstack.common.gettextutils import _
AGENT = BackupAgent()
CONF = cfg.CONF
MANAGER = 'mysql' if not CONF.datastore_manager else CONF.datastore_manager
MASTER_CONFIG = """
[mysqld]
log_bin = /var/lib/mysql/mysql-bin.log
"""
SLAVE_CONFIG = """
[mysqld]
log_bin = /var/lib/mysql/mysql-bin.log
relay_log = /var/lib/mysql/mysql-relay-bin.log
read_only = true
"""
REPL_BACKUP_NAMESPACE = 'trove.guestagent.strategies.backup.mysql_impl'
REPL_BACKUP_STRATEGY = 'InnoBackupEx'
REPL_BACKUP_RUNNER = backup.get_backup_strategy(REPL_BACKUP_STRATEGY,
REPL_BACKUP_NAMESPACE)
REPL_EXTRA_OPTS = CONF.backup_runner_options.get(REPL_BACKUP_STRATEGY, '')
LOG = logging.getLogger(__name__)
class MysqlBinlogReplication(base.Replication):
"""MySql Replication coordinated by binlog position."""
class UnableToDetermineBinlogPosition(exception.TroveError):
message = _("Unable to determine binlog position "
"(from file %(binlog_file)).")
def get_master_ref(self, service, snapshot_info):
master_ref = {
'host': operating_system.get_ip_address(),
'port': service.get_port()
}
return master_ref
def snapshot_for_replication(self, context, service,
location, snapshot_info):
snapshot_id = snapshot_info['id']
storage = get_storage_strategy(
CONF.storage_strategy,
CONF.storage_namespace)(context)
AGENT.stream_backup_to_storage(snapshot_info, REPL_BACKUP_RUNNER,
storage, {}, REPL_EXTRA_OPTS)
# With streamed InnobackupEx, the log position is in
# the stream and will be decoded by the slave
log_position = {}
return snapshot_id, log_position
def enable_as_master(self, service, snapshot_info, master_config):
if not master_config:
master_config = MASTER_CONFIG
service.write_replication_overrides(master_config)
service.restart()
service.grant_replication_privilege()
def enable_as_slave(self, service, snapshot, slave_config):
if not slave_config:
slave_config = SLAVE_CONFIG
service.write_replication_overrides(slave_config)
service.restart()
service.change_master_for_binlog(
snapshot['master']['host'],
snapshot['master']['port'],
self._read_log_position())
service.start_slave()
def detach_slave(self, service):
service.stop_slave()
service.remove_replication_overrides()
service.restart()
def demote_master(self, service):
service.revoke_replication_privilege()
service.remove_replication_overrides()
service.restart()
def _read_log_position(self):
INFO_FILE = '/var/lib/mysql/xtrabackup_binlog_info'
LOG.info(_("Setting read permissions on %s") % INFO_FILE)
utils.execute_with_timeout("sudo", "chmod", "+r", INFO_FILE)
LOG.info(_("Reading log position from %s") % INFO_FILE)
try:
with open(INFO_FILE, 'rb') as f:
row = csv.reader(f, delimiter='\t',
skipinitialspace=True).next()
return {
'log_file': row[0],
'log_position': int(row[1])
}
except (IOError, IndexError) as ex:
LOG.exception(ex)
raise self.UnableToDetermineBinlogPosition(
{'info_file': INFO_FILE})
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