66 lines
2.0 KiB
Python
66 lines
2.0 KiB
Python
"""Async database engine and session helpers."""
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from collections.abc import AsyncGenerator
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from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, async_sessionmaker, create_async_engine
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from app.config.settings import get_settings
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from app.infra.db.base import Base
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_engine: AsyncEngine | None = None
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_session_factory: async_sessionmaker[AsyncSession] | None = None
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def get_async_engine() -> AsyncEngine:
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"""Return the lazily created async SQLAlchemy engine."""
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global _engine
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if _engine is None:
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_engine = create_async_engine(
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get_settings().database_url,
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future=True,
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echo=False,
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)
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return _engine
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def get_session_factory() -> async_sessionmaker[AsyncSession]:
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"""Return the lazily created async session factory."""
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global _session_factory
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if _session_factory is None:
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_session_factory = async_sessionmaker(get_async_engine(), expire_on_commit=False)
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return _session_factory
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async def get_db_session() -> AsyncGenerator[AsyncSession, None]:
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"""Yield a database session for FastAPI dependencies."""
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async with get_session_factory()() as session:
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yield session
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async def init_database() -> None:
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"""Create database tables when running the MVP without migrations."""
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from app.infra.db.models.asset import AssetORM
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from app.infra.db.models.order import OrderORM
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from app.infra.db.models.review_task import ReviewTaskORM
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from app.infra.db.models.workflow_run import WorkflowRunORM
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from app.infra.db.models.workflow_step import WorkflowStepORM
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del AssetORM, OrderORM, ReviewTaskORM, WorkflowRunORM, WorkflowStepORM
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async with get_async_engine().begin() as connection:
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await connection.run_sync(Base.metadata.create_all)
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async def dispose_database() -> None:
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"""Dispose the active engine and clear cached session objects."""
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global _engine, _session_factory
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if _engine is not None:
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await _engine.dispose()
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_engine = None
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_session_factory = None
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