karbor/smaug/db/migration.py
chenying a3e7db9916 basic API service: Create the base data abstraction layer into the DB
Create the base data abstraction layer into the DB in basic API service.
I create a database table services as a example. This table is used to save the
running status of deployed services.
The command smaug-manage is used to manage the database. we can use this command
'smaug-manage db sync' to sync the smaug database up to the most recent version.
smaug-manage version list: exposing the smaug codebase version.
smaug-manage config list: exposing the configuration.
smaug-manage service list: showing a list of all smaug services status.

Change-Id: I2beeae0c0a7494a88bc4e4d143d36cee3f3f2a4e
Closes-Bug: #1525794
2015-12-18 15:23:21 +08:00

58 lines
1.7 KiB
Python

# 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.
"""Database setup and migration commands."""
import os
import threading
from oslo_config import cfg
from oslo_db import options
from stevedore import driver
from smaug.db.sqlalchemy import api as db_api
INIT_VERSION = 000
_IMPL = None
_LOCK = threading.Lock()
options.set_defaults(cfg.CONF)
MIGRATE_REPO_PATH = os.path.join(
os.path.abspath(os.path.dirname(__file__)),
'sqlalchemy',
'migrate_repo',
)
def get_backend():
global _IMPL
if _IMPL is None:
with _LOCK:
if _IMPL is None:
_IMPL = driver.DriverManager(
"smaug.database.migration_backend",
cfg.CONF.database.backend).driver
return _IMPL
def db_sync(version=None, init_version=INIT_VERSION, engine=None):
"""Migrate the database to `version` or the most recent version."""
if engine is None:
engine = db_api.get_engine()
return get_backend().db_sync(engine=engine,
abs_path=MIGRATE_REPO_PATH,
version=version,
init_version=init_version)