DataOps-platform/deployment/migrations/env.py

from __future__ import annotations

import os
from logging.config import fileConfig

from alembic import context
from sqlalchemy import engine_from_config, pool


config = context.config
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

database_url = os.environ.get("SQLALCHEMY_DATABASE_URI") or os.environ.get(
    "DATABASE_URL"
)
if not database_url:
    raise RuntimeError(
        "SQLALCHEMY_DATABASE_URI or DATABASE_URL must be configured for migrations"
    )

# ConfigParser treats percent signs as interpolation markers.
config.set_main_option("sqlalchemy.url", database_url.replace("%", "%%"))
target_metadata = None
MIGRATION_ADVISORY_LOCK_ID = 2026072201


def run_migrations_offline() -> None:
    context.configure(
        url=database_url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )
    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    connectable = engine_from_config(
        config.get_section(config.config_ini_section, {}),
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )
    with connectable.connect() as connection:
        connection.exec_driver_sql(
            "SELECT pg_advisory_lock(%s)", (MIGRATION_ADVISORY_LOCK_ID,)
        )
        connection.commit()
        try:
            context.configure(connection=connection, target_metadata=target_metadata)
            with context.begin_transaction():
                context.run_migrations()
        finally:
            connection.exec_driver_sql(
                "SELECT pg_advisory_unlock(%s)", (MIGRATION_ADVISORY_LOCK_ID,)
            )
            connection.commit()


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