ATLAS/backend/alembic/env.py

"""
Alembic environment configuration for Atlas Fleet Monitor.

Configurado para:
- SQLAlchemy async (asyncpg)
- TimescaleDB hypertables
- Migraciones automáticas desde modelos
"""

import asyncio
from logging.config import fileConfig

from alembic import context
from sqlalchemy import pool, text
from sqlalchemy.engine import Connection
from sqlalchemy.ext.asyncio import async_engine_from_config

from app.core.config import settings
from app.models.base import Base

# Import all models so they are registered with Base.metadata
from app.models import (
    Usuario,
    GrupoVehiculos,
    Conductor,
    Vehiculo,
    Dispositivo,
    Ubicacion,
    Viaje,
    Parada,
    TipoAlerta,
    Alerta,
    Geocerca,
    POI,
    CargaCombustible,
    TipoMantenimiento,
    Mantenimiento,
    Camara,
    Grabacion,
    EventoVideo,
    Mensaje,
    Configuracion,
)

# 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.
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# add your model's MetaData object here
target_metadata = Base.metadata


def get_url() -> str:
    """
    Obtiene la URL de la base de datos desde la configuración.
    """
    return settings.DATABASE_URL


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 = get_url()
    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
        compare_type=True,
        compare_server_default=True,
    )

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


def do_run_migrations(connection: Connection) -> None:
    """
    Run migrations with the given connection.
    """
    context.configure(
        connection=connection,
        target_metadata=target_metadata,
        compare_type=True,
        compare_server_default=True,
    )

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


async def run_async_migrations() -> None:
    """
    Run migrations in 'online' mode with async engine.

    In this scenario we need to create an Engine
    and associate a connection with the context.
    """
    configuration = config.get_section(config.config_ini_section)
    configuration["sqlalchemy.url"] = get_url()

    connectable = async_engine_from_config(
        configuration,
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )

    async with connectable.connect() as connection:
        await connection.run_sync(do_run_migrations)

    await connectable.dispose()


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


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