Sepehr
550f3516db
- Add SQLAlchemy models for User, Translation, ApiKey, UsageLog, PaymentHistory - Add database connection management with PostgreSQL/SQLite support - Add repository layer for CRUD operations - Add Alembic migration setup with initial migration - Update auth_service to automatically use database when DATABASE_URL is set - Update docker-compose.yml with PostgreSQL service and Redis (non-optional) - Add database migration script (scripts/migrate_to_db.py) - Update .env.example with database configuration
140 lines
3.9 KiB
Python
140 lines
3.9 KiB
Python
"""
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Database connection and session management
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Supports both PostgreSQL (production) and SQLite (development/testing)
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"""
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import os
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import logging
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from typing import Generator, Optional
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from contextlib import contextmanager
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from sqlalchemy import create_engine, event
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from sqlalchemy.orm import sessionmaker, Session
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from sqlalchemy.pool import QueuePool, StaticPool
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logger = logging.getLogger(__name__)
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# Database URL from environment
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# PostgreSQL: postgresql://user:password@host:port/database
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# SQLite: sqlite:///./data/translate.db
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DATABASE_URL = os.getenv("DATABASE_URL", "")
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# Determine if we're using SQLite or PostgreSQL
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_is_sqlite = DATABASE_URL.startswith("sqlite") if DATABASE_URL else True
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# Create engine based on database type
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if DATABASE_URL and not _is_sqlite:
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# PostgreSQL configuration
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engine = create_engine(
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DATABASE_URL,
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poolclass=QueuePool,
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pool_size=5,
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max_overflow=10,
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pool_timeout=30,
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pool_recycle=1800, # Recycle connections after 30 minutes
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pool_pre_ping=True, # Check connection health before use
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echo=os.getenv("DATABASE_ECHO", "false").lower() == "true",
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)
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logger.info("✅ Database configured with PostgreSQL")
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else:
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# SQLite configuration (for development/testing or when no DATABASE_URL)
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sqlite_path = os.getenv("SQLITE_PATH", "data/translate.db")
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os.makedirs(os.path.dirname(sqlite_path), exist_ok=True)
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sqlite_url = f"sqlite:///./{sqlite_path}"
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engine = create_engine(
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sqlite_url,
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connect_args={"check_same_thread": False},
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poolclass=StaticPool,
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echo=os.getenv("DATABASE_ECHO", "false").lower() == "true",
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)
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# Enable foreign keys for SQLite
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@event.listens_for(engine, "connect")
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def set_sqlite_pragma(dbapi_connection, connection_record):
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cursor = dbapi_connection.cursor()
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cursor.execute("PRAGMA foreign_keys=ON")
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cursor.close()
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if not DATABASE_URL:
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logger.warning("⚠️ DATABASE_URL not set, using SQLite for development")
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else:
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logger.info(f"✅ Database configured with SQLite: {sqlite_path}")
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# Session factory
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SessionLocal = sessionmaker(
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autocommit=False,
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autoflush=False,
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bind=engine,
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expire_on_commit=False,
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)
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def get_db() -> Generator[Session, None, None]:
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"""
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Dependency for FastAPI to get database session.
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Usage: db: Session = Depends(get_db)
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"""
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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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@contextmanager
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def get_db_session() -> Generator[Session, None, None]:
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"""
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Context manager for database session.
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Usage: with get_db_session() as db: ...
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"""
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db = SessionLocal()
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try:
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yield db
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db.commit()
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except Exception:
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db.rollback()
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raise
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finally:
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db.close()
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# Alias for backward compatibility
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get_sync_session = get_db_session
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def init_db():
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"""
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Initialize database tables.
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Call this on application startup.
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"""
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from database.models import Base
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Base.metadata.create_all(bind=engine)
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logger.info("✅ Database tables initialized")
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def check_db_connection() -> bool:
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"""
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Check if database connection is healthy.
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Returns True if connection works, False otherwise.
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"""
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try:
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with engine.connect() as conn:
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conn.execute("SELECT 1")
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return True
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except Exception as e:
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logger.error(f"Database connection check failed: {e}")
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return False
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# Connection pool stats (for monitoring)
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def get_pool_stats() -> dict:
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"""Get database connection pool statistics"""
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if hasattr(engine.pool, 'status'):
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return {
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"pool_size": engine.pool.size(),
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"checked_in": engine.pool.checkedin(),
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"checked_out": engine.pool.checkedout(),
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"overflow": engine.pool.overflow(),
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}
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return {"status": "pool stats not available"}
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