superset/migrations/env.py

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import logging
from logging.config import fileConfig
from typing import List

from alembic import context
from alembic.operations.ops import MigrationScript
from alembic.runtime.migration import MigrationContext
from flask import current_app
from flask_appbuilder import Base
from sqlalchemy import engine_from_config, pool

# 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)
logger = logging.getLogger("alembic.env")

DATABASE_URI = current_app.config["SQLALCHEMY_DATABASE_URI"]
if "sqlite" in DATABASE_URI:
    logger.warning(
        "SQLite Database support for metadata databases will \
        be removed in a future version of Superset."
    )
config.set_main_option("sqlalchemy.url", DATABASE_URI)
target_metadata = Base.metadata  # pylint: disable=no-member


# 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 run_migrations_offline() -> None:
    """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)

    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    """Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    """

    # this callback is used to prevent an auto-migration from being generated
    # when there are no changes to the schema
    # reference: https://alembic.sqlalchemy.org/en/latest/cookbook.html
    def process_revision_directives(  # pylint: disable=redefined-outer-name, unused-argument
        context: MigrationContext, revision: str, directives: List[MigrationScript]
    ) -> None:
        if getattr(config.cmd_opts, "autogenerate", False):
            script = directives[0]
            if script.upgrade_ops.is_empty():
                directives[:] = []
                logger.info("No changes in schema detected.")

    engine = engine_from_config(
        config.get_section(config.config_ini_section),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )

    connection = engine.connect()
    kwargs = {}
    if engine.name in ("sqlite", "mysql"):
        kwargs = {"transaction_per_migration": True, "transactional_ddl": True}
    configure_args = current_app.extensions["migrate"].configure_args
    if configure_args:
        kwargs.update(configure_args)

    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        # compare_type=True,
        process_revision_directives=process_revision_directives,
        **kwargs
    )

    try:
        with context.begin_transaction():
            context.run_migrations()
    finally:
        connection.close()


if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()