deckhand/alembic/env.py
Bryan Strassner 5f1fbbee3c [396582] Add alembic support to Deckhand
Updates Deckhand to use alembic to manage database upgrades.
Moves from creating tables at startup of Deckhand to the
db-sync job.

Change-Id: I6f4cb237fadc46fbee81d1c33096f48a720f589f
2018-04-06 23:30:16 -04:00

96 lines
3.1 KiB
Python

# Generated file from Alembic, modified portions copyright follows:
# Copyright 2018 AT&T Intellectual Property. All other 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.
from __future__ import with_statement
import logging
from logging.config import fileConfig
import os
from alembic import context
from oslo_config import cfg
from sqlalchemy import engine_from_config, pool
from deckhand.db.sqlalchemy import api as db_api
from deckhand.db.sqlalchemy import models
# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config
# Interpret the config file for Python logging.
# This line sets up loggers basically.
fileConfig(config.config_file_name)
# Portions modified for Deckhand Specifics:
# Set up and retrieve the config file for Deckhand. Sets up the oslo_config
logger = logging.getLogger('alembic.env')
CONF = cfg.CONF
dirname = os.environ.get('DECKHAND_CONFIG_DIR', '/etc/deckhand').strip()
config_files = [os.path.join(dirname, 'deckhand.conf')]
CONF([], project='deckhand', default_config_files=config_files)
logger.info("Database Connection: %s", CONF.database.connection)
config.set_main_option('sqlalchemy.url', CONF.database.connection)
models.register_models(db_api.get_engine(),
CONF.database.connection)
target_metadata = models.BASE.metadata
# End Deckhand Specifics
def run_migrations_offline():
"""Run migrations in 'offline' mode.
This configures the context with just a URL
and not an Engine, though an Engine is acceptable
here as well. By skipping the Engine creation
we don't even need a DBAPI to be available.
Calls to context.execute() here emit the given string to the
script output.
"""
url = config.get_main_option("sqlalchemy.url")
context.configure(
url=url, target_metadata=target_metadata, literal_binds=True)
with context.begin_transaction():
context.run_migrations()
def run_migrations_online():
"""Run migrations in 'online' mode.
In this scenario we need to create an Engine
and associate a connection with the context.
"""
connectable = engine_from_config(
config.get_section(config.config_ini_section),
prefix='sqlalchemy.',
poolclass=pool.NullPool)
with connectable.connect() as connection:
context.configure(
connection=connection,
target_metadata=target_metadata
)
with context.begin_transaction():
context.run_migrations()
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()