69 lines
2.0 KiB
Python
69 lines
2.0 KiB
Python
"""Async SQLAlchemy database engine and session management."""
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from collections.abc import AsyncGenerator
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from sqlalchemy import event
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from sqlalchemy.ext.asyncio import (
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AsyncSession,
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async_sessionmaker,
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create_async_engine,
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)
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from sqlalchemy.orm import DeclarativeBase
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from src.backend.config import settings
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_IS_SQLITE = settings.database_url.startswith("sqlite")
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# Create async engine. MySQL gets a connection pool; SQLite (local file of the
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# Windows package) does not accept pool_size/max_overflow/pool_recycle.
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if _IS_SQLITE:
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engine = create_async_engine(settings.database_url, echo=False)
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@event.listens_for(engine.sync_engine, "connect")
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def _sqlite_pragmas(dbapi_connection, _connection_record) -> None:
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"""Per-connection PRAGMAs: SQLite ignores FKs unless asked, and WAL +
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busy_timeout let the web, vision and backend threads share the file."""
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cursor = dbapi_connection.cursor()
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cursor.execute("PRAGMA foreign_keys=ON")
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cursor.execute("PRAGMA journal_mode=WAL")
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cursor.execute("PRAGMA busy_timeout=5000")
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cursor.close()
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else:
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engine = create_async_engine(
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settings.database_url,
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echo=False,
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pool_size=10,
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max_overflow=20,
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pool_recycle=3600,
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)
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# Session factory
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async_session_factory = async_sessionmaker(
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engine,
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class_=AsyncSession,
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expire_on_commit=False,
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)
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class Base(DeclarativeBase):
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"""Base class for all SQLAlchemy models."""
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pass
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async def get_db() -> AsyncGenerator[AsyncSession, None]:
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"""Dependency for FastAPI - yields an async database session."""
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async with async_session_factory() as session:
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try:
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yield session
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await session.commit()
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except Exception:
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await session.rollback()
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raise
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finally:
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await session.close()
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async def init_db() -> None:
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"""Create all tables (dev only - use Alembic in production)."""
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async with engine.begin() as conn:
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await conn.run_sync(Base.metadata.create_all)
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