63 lines
1.7 KiB
Python
63 lines
1.7 KiB
Python
"""Database dependencies for FastAPI."""
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from collections.abc import Generator
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from pathlib import Path
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from sqlalchemy import create_engine
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from sqlalchemy.orm import Session, sessionmaker
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from ont_platform.config import load_settings
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from ont_platform.storage.models import Base
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# Initialize database engine (lazy singleton)
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_engine = None
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_SessionLocal = None
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def get_db_engine():
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"""Get or create database engine."""
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global _engine
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if _engine is None:
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settings = load_settings()
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database_url = settings.database_url
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_ensure_sqlite_parent(database_url)
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_engine = create_engine(
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database_url,
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connect_args={"timeout": 30} if "sqlite" in database_url else {},
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pool_pre_ping=True,
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echo=False,
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)
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Base.metadata.create_all(bind=_engine)
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return _engine
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def get_session_factory():
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"""Get or create session factory."""
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global _SessionLocal
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if _SessionLocal is None:
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engine = get_db_engine()
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_SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
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return _SessionLocal
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def get_db() -> Generator[Session, None, None]:
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"""FastAPI dependency for database session."""
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SessionLocal = get_session_factory()
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db = SessionLocal()
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try:
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yield db
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finally:
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db.close()
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def _ensure_sqlite_parent(database_url: str) -> None:
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if not database_url.startswith("sqlite:///"):
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return
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db_path = database_url.removeprefix("sqlite:///")
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if db_path in {":memory:", ""}:
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return
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Path(db_path).expanduser().parent.mkdir(parents=True, exist_ok=True)
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__all__ = ["get_db", "get_db_engine", "get_session_factory"]
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