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env.py
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env.py
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# -*- coding: utf-8 -*-
#
# This file is part of REANA.
# Copyright (C) 2020 CERN.
#
# REANA is free software; you can redistribute it and/or modify it
# under the terms of the MIT License; see LICENSE file for more details.
"""REANA DB alembic's environment context."""
from logging.config import fileConfig
from sqlalchemy import engine_from_config
from sqlalchemy import pool
from alembic import context
from reana_db.config import SQLALCHEMY_DATABASE_URI
from reana_db.models import Base
# 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)
# add your model's MetaData object here
# for 'autogenerate' support
# from myapp import mymodel
# target_metadata = mymodel.Base.metadata
target_metadata = Base.metadata
# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.
def _include_object(object_, name, *args):
# We ignore non-reana tables in migrations
schema = object_.schema if hasattr(object_, "schema") else object_.table.schema
if name == "alembic_version" or schema != "__reana":
return False
return True
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.
"""
context.configure(
url=SQLALCHEMY_DATABASE_URI,
target_metadata=target_metadata,
literal_binds=True,
dialect_opts={"paramstyle": "named"},
version_table_schema="__reana",
include_schemas=True,
include_object=_include_object,
)
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.
"""
conf = {
"script_location": "reana_db/alembic",
"sqlalchemy.url": SQLALCHEMY_DATABASE_URI,
}
connectable = engine_from_config(
conf, prefix="sqlalchemy.", poolclass=pool.NullPool,
)
with connectable.connect() as connection:
context.configure(
connection=connection,
target_metadata=target_metadata,
version_table_schema="__reana",
include_schemas=True,
include_object=_include_object,
)
with context.begin_transaction():
context.run_migrations()
if context.is_offline_mode():
run_migrations_offline()
else:
run_migrations_online()