Nikolay Tatarinov
28973489a5
- Updated `.dockerignore` to exclude test and development artifacts, optimizing the Docker image size. - Refactored `main.py` to delegate execution to `duty_teller.run.main()`, simplifying the entry point. - Introduced a new `duty_teller` package to encapsulate core functionality, improving modularity and organization. - Enhanced `pyproject.toml` to define a script for running the application, streamlining the execution process. - Updated README documentation to reflect changes in project structure and usage instructions. - Improved Alembic environment configuration to utilize the new package structure for database migrations.
58 lines
1.7 KiB
Python
58 lines
1.7 KiB
Python
"""SQLAlchemy engine and session factory.
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Engine and session factory are cached globally per process. Only one DATABASE_URL
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is effectively used for the process lifetime. Using a different URL later (e.g. in
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tests with in-memory SQLite) would still use the first engine. To use a different
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URL in tests, set env (e.g. DATABASE_URL) before the first import of this module, or
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clear _engine and _SessionLocal in test fixtures. Prefer session_scope() for all
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callers so sessions are always closed and rolled back on error.
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"""
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from contextlib import contextmanager
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from typing import Generator
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from sqlalchemy import create_engine
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from sqlalchemy.orm import Session, sessionmaker
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_engine = None
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_SessionLocal = None
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@contextmanager
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def session_scope(database_url: str) -> Generator[Session, None, None]:
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"""Context manager: yields a session, rolls back on exception, closes on exit."""
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session = get_session(database_url)
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try:
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yield session
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except Exception:
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session.rollback()
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raise
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finally:
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session.close()
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def get_engine(database_url: str):
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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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database_url,
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connect_args={"check_same_thread": False}
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if "sqlite" in database_url
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else {},
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echo=False,
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)
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return _engine
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def get_session_factory(database_url: str) -> sessionmaker[Session]:
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global _SessionLocal
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if _SessionLocal is None:
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engine = get_engine(database_url)
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_SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
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return _SessionLocal
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def get_session(database_url: str) -> Session:
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return get_session_factory(database_url)()
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