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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 abc
import uuid
from oslo_log import log as logging
from oslo_utils import netutils
from trove.common import cfg
from trove.common import exception
from trove.common import utils
from trove.common.db.mysql import models
from trove.guestagent.common import operating_system
from trove.guestagent.strategies.replication import base
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
class MysqlReplicationBase(base.Replication):
"""Base class for MySql Replication strategies."""
def get_master_ref(self, service, snapshot_info):
master_ref = {
'host': netutils.get_my_ipv4(),
'port': service.get_port()
}
return master_ref
def _create_replication_user(self, service, adm):
replication_user = None
replication_password = utils.generate_random_password(16)
mysql_user = None # cache the model as we just want name validation
retry_count = 0
while replication_user is None:
try:
name = 'slave_' + str(uuid.uuid4())[:8]
if mysql_user:
mysql_user.name = name
else:
mysql_user = models.MySQLUser(
name=name, password=replication_password
)
mysql_user.check_create()
LOG.debug("Trying to create replication user %s",
mysql_user.name)
adm.create_users([mysql_user.serialize()])
replication_user = {
'name': mysql_user.name,
'password': replication_password
}
except Exception:
retry_count += 1
if retry_count > 5:
LOG.error("Replication user retry count exceeded")
raise
return replication_user
def snapshot_for_replication(self, context, service, adm, location,
snapshot_info):
LOG.info("Creating backup for replication")
volumes_mapping = {
'/var/lib/mysql': {'bind': '/var/lib/mysql', 'mode': 'rw'},
"/var/run/mysqld": {"bind": "/var/run/mysqld", "mode": "ro"},
'/tmp': {'bind': '/tmp', 'mode': 'rw'}
}
service.create_backup(context, snapshot_info,
volumes_mapping=volumes_mapping)
LOG.info('Creating replication user')
replication_user = self._create_replication_user(service, adm)
service.grant_replication_privilege(replication_user)
replica_conf = {
'log_position': {},
'replication_user': replication_user
}
return snapshot_info['id'], replica_conf
def enable_as_master(self, service, master_config):
if not service.exists_replication_source_overrides():
service.write_replication_source_overrides(master_config)
service.restart()
def read_last_master_gtid(self, service):
INFO_FILE = ('%s/xtrabackup_binlog_info' % service.get_data_dir())
operating_system.chmod(INFO_FILE,
operating_system.FileMode.ADD_READ_ALL,
as_root=True)
LOG.info("Reading last master GTID from %s", INFO_FILE)
try:
with open(INFO_FILE, 'r') as f:
content = f.read()
LOG.debug('Content in %s: "%s"', INFO_FILE, content)
ret = content.strip().split('\t')
return ret[2] if len(ret) == 3 else ''
except Exception as ex:
LOG.error('Failed to read last master GTID, error: %s', str(ex))
raise exception.UnableToDetermineLastMasterGTID(
{'binlog_file': INFO_FILE})
@abc.abstractmethod
def connect_to_master(self, service, master_info):
"""Connects a slave to a master"""
def enable_as_slave(self, service, master_info, slave_config):
try:
service.write_replication_replica_overrides(slave_config)
service.restart()
self.connect_to_master(service, master_info)
except Exception as err:
LOG.error("Exception enabling guest as replica, error: %s",
str(err))
raise
def detach_slave(self, service, for_failover):
replica_info = service.stop_slave(for_failover)
service.remove_replication_replica_overrides()
service.restart()
return replica_info
def get_replica_context(self, service, adm):
"""Get replication information as master."""
replication_user = self._create_replication_user(service, adm)
service.grant_replication_privilege(replication_user)
return {
'master': self.get_master_ref(service, None),
'replica_conf': {
'log_position': {},
'replication_user': replication_user
}
}
def cleanup_source_on_replica_detach(self, admin_service, replica_info):
admin_service.delete_user_by_name(replica_info['replication_user'])
def demote_master(self, service):
service.remove_replication_source_overrides()
service.restart()
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