62 lines
1.8 KiB
Python
62 lines
1.8 KiB
Python
from contextlib import contextmanager
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from functools import lru_cache
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from typing import Generator
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from config import postgres_configs
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from sqlalchemy import create_engine
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from sqlalchemy.orm import declarative_base, sessionmaker, scoped_session, Session
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# Configure the database engine with proper pooling
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engine = create_engine(
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postgres_configs.url,
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pool_pre_ping=True, # Verify connection before using
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pool_size=20, # Maximum number of permanent connections
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max_overflow=10, # Maximum number of additional connections
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pool_recycle=600, # Recycle connections after 1 hour
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pool_timeout=30, # Wait up to 30 seconds for a connection
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echo=True, # Set to True for debugging SQL queries
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)
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Base = declarative_base()
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# Create a cached session factory
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@lru_cache()
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def get_session_factory() -> scoped_session:
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"""Create a thread-safe session factory."""
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session_local = sessionmaker(
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bind=engine,
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autocommit=False,
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autoflush=False,
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expire_on_commit=True, # Prevent expired object issues
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)
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return scoped_session(session_local)
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# Get database session with proper connection management
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@contextmanager
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def get_db() -> Generator[Session, None, None]:
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"""Get database session with proper connection management.
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This context manager ensures:
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- Proper connection pooling
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- Session cleanup
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- Connection return to pool
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- Thread safety
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Yields:
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Session: SQLAlchemy session object
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"""
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session_factory = get_session_factory()
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session = session_factory()
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try:
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yield session
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session.commit()
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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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session_factory.remove() # Clean up the session from the registry
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