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env.py
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env.py
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from __future__ import with_statement
import os
from logging.config import fileConfig
from alembic import context
from oslo_config import cfg
from sqlalchemy import create_engine, pool
# this is the shipyard config object
CONF = cfg.CONF
# 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.
if config.attributes.get('configure_logger', True):
fileConfig(config.config_file_name)
target_metadata = None
def get_url():
"""
Returns the url to use instead of using the alembic configuration
file
"""
return CONF.base.postgresql_db
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 = get_url()
# Default code: 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 = create_engine(get_url())
# Default/generated code:
# 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()