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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 os
from oslo_log import log as logging
from trove.common import cfg
from trove.common import exception
from trove.common import utils
from trove.common.notification import EndNotification
from trove.guestagent import guest_log
from trove.guestagent.common import operating_system
from trove.guestagent.datastore import manager
from trove.guestagent.datastore.postgres import service
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
class PostgresManager(manager.Manager):
def __init__(self):
super(PostgresManager, self).__init__('postgres')
self.status = service.PgSqlAppStatus(self.docker_client)
self.app = service.PgSqlApp(self.status, self.docker_client)
self.adm = service.PgSqlAdmin(service.SUPER_USER_NAME)
@property
def configuration_manager(self):
return self.app.configuration_manager
def do_prepare(self, context, packages, databases, memory_mb, users,
device_path, mount_point, backup_info,
config_contents, root_password, overrides,
cluster_config, snapshot, ds_version=None):
operating_system.ensure_directory(self.app.datadir,
user=CONF.database_service_uid,
group=CONF.database_service_uid,
as_root=True)
operating_system.ensure_directory(service.WAL_ARCHIVE_DIR,
user=CONF.database_service_uid,
group=CONF.database_service_uid,
as_root=True)
LOG.info('Preparing database config files')
self.app.configuration_manager.save_configuration(config_contents)
self.app.set_data_dir(self.app.datadir)
self.app.update_overrides(overrides)
# Prepare pg_hba.conf
self.app.apply_access_rules()
self.configuration_manager.apply_system_override(
{'hba_file': service.HBA_CONFIG_FILE})
# Restore data from backup and reset root password
if backup_info:
self.perform_restore(context, self.app.datadir, backup_info)
if not snapshot:
signal_file = f"{self.app.datadir}/recovery.signal"
operating_system.execute_shell_cmd(
f"touch {signal_file}", [], shell=True, as_root=True)
operating_system.chown(signal_file, CONF.database_service_uid,
CONF.database_service_uid, force=True,
as_root=True)
if snapshot:
# This instance is a replica
self.attach_replica(context, snapshot, snapshot['config'])
# config_file can only be set on the postgres command line
command = f"postgres -c config_file={service.CONFIG_FILE}"
self.app.start_db(ds_version=ds_version, command=command)
def apply_overrides(self, context, overrides):
"""Reload config."""
LOG.info("Reloading database config.")
self.app.apply_overrides(overrides)
LOG.info("Finished reloading database config.")
def get_datastore_log_defs(self):
owner = cfg.get_configuration_property('database_service_uid')
datastore_dir = self.app.get_data_dir()
long_query_time = CONF.get(self.manager).get(
'guest_log_long_query_time')
general_log_file = self.build_log_file_name(
self.GUEST_LOG_DEFS_GENERAL_LABEL, owner,
datastore_dir=datastore_dir)
general_log_dir, general_log_filename = os.path.split(general_log_file)
return {
self.GUEST_LOG_DEFS_GENERAL_LABEL: {
self.GUEST_LOG_TYPE_LABEL: guest_log.LogType.USER,
self.GUEST_LOG_USER_LABEL: owner,
self.GUEST_LOG_FILE_LABEL: general_log_file,
self.GUEST_LOG_ENABLE_LABEL: {
'logging_collector': True,
'log_destination': 'stderr',
'log_directory': general_log_dir,
'log_filename': general_log_filename,
'log_statement': 'all',
'debug_print_plan': True,
'log_min_duration_statement': long_query_time,
},
self.GUEST_LOG_DISABLE_LABEL: {
'logging_collector': False,
},
self.GUEST_LOG_RESTART_LABEL: True,
},
}
def is_log_enabled(self, logname):
return self.configuration_manager.get_value('logging_collector', False)
def create_backup(self, context, backup_info):
"""Create backup for the database.
:param context: User context object.
:param backup_info: a dictionary containing the db instance id of the
backup task, location, type, and other data.
"""
LOG.info(f"Creating backup {backup_info['id']}")
with EndNotification(context):
volumes_mapping = {
'/var/lib/postgresql/data': {
'bind': '/var/lib/postgresql/data', 'mode': 'rw'
},
"/var/run/postgresql": {"bind": "/var/run/postgresql",
"mode": "ro"},
}
extra_params = f"--pg-wal-archive-dir {service.WAL_ARCHIVE_DIR}"
self.app.create_backup(context, backup_info,
volumes_mapping=volumes_mapping,
need_dbuser=False,
extra_params=extra_params)
def attach_replica(self, context, replica_info, slave_config,
restart=False):
"""Set up the standby server."""
self.replication.enable_as_slave(self.app, replica_info, None)
# For the previous primary, don't start db service in order to run
# pg_rewind command next.
if restart:
self.app.restart()
def make_read_only(self, context, read_only):
"""There seems to be no way to flag this at the database level in
PostgreSQL at the moment -- see discussion here:
http://www.postgresql.org/message-id/flat/CA+TgmobWQJ-GCa_tWUc4=80A
1RJ2_+Rq3w_MqaVguk_q018dqw@mail.gmail.com#CA+TgmobWQJ-GCa_tWUc4=80A1RJ
2_+Rq3w_MqaVguk_q018dqw@mail.gmail.com
"""
pass
def get_latest_txn_id(self, context):
if self.app.is_replica():
lsn = self.app.get_last_wal_replay_lsn()
else:
lsn = self.app.get_current_wal_lsn()
LOG.info("Last wal location found: %s", lsn)
return lsn
def wait_for_txn(self, context, txn):
if not self.app.is_replica():
raise exception.TroveError("Attempting to wait for a txn on a "
"non-replica server")
def _wait_for_txn():
lsn = self.app.get_last_wal_replay_lsn()
LOG.info("Last wal location found: %s", lsn)
return lsn >= txn
try:
utils.poll_until(_wait_for_txn, time_out=60)
except exception.PollTimeOut:
raise exception.TroveError(
f"Timeout occurred waiting for wal offset to change to {txn}")
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