48 lines
1.2 KiB
Python
48 lines
1.2 KiB
Python
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"""Engine + sessionmaker. Lazily initialised so test code can swap the URL."""
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from __future__ import annotations
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from collections.abc import Iterator
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from contextlib import contextmanager
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from sqlalchemy import create_engine
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from sqlalchemy.engine import Engine
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from sqlalchemy.orm import Session, sessionmaker
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from app.core.config import settings
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_engine: Engine | None = None
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_SessionLocal: sessionmaker[Session] | None = None
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def get_engine() -> Engine:
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global _engine
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if _engine is None:
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_engine = create_engine(
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settings.database_url,
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pool_pre_ping=True,
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future=True,
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)
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return _engine
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def get_sessionmaker() -> sessionmaker[Session]:
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global _SessionLocal
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if _SessionLocal is None:
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_SessionLocal = sessionmaker(bind=get_engine(), expire_on_commit=False, future=True)
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return _SessionLocal
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@contextmanager
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def session_scope() -> Iterator[Session]:
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"""Context manager that commits on success, rolls back on error."""
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s = get_sessionmaker()()
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try:
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yield s
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s.commit()
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except Exception:
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s.rollback()
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raise
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finally:
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s.close()
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