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"""
database.py
This module sets up the SQLAlchemy database connection for the Expressive TTS Arena project.
It initializes the PostgreSQL engine, creates a session factory for handling database transactions,
and defines a declarative base class for ORM models.
If no DATABASE_URL environment variable is set, then create a dummy database to fail gracefully
"""
# Standard Library Imports
import os
# Third-Party Library Imports
from sqlalchemy import create_engine
from sqlalchemy.orm import declarative_base, sessionmaker
# Local Application Imports
from src.config import APP_ENV
DATABASE_URL = os.getenv("DATABASE_URL")
if APP_ENV == "prod":
# In production, a valid DATABASE_URL is required.
if not DATABASE_URL:
raise ValueError("DATABASE_URL must be set in production!")
engine = create_engine(DATABASE_URL)
SessionLocal = sessionmaker(bind=engine)
# In development, if a DATABASE_URL is provided, use it.
elif DATABASE_URL:
engine = create_engine(DATABASE_URL)
SessionLocal = sessionmaker(bind=engine)
else:
# No DATABASE_URL is provided; use a DummySession that does nothing.
engine = None
class DummySession:
is_dummy = True # Flag to indicate this is a dummy session.
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
pass
def add(self, _instance, _warn=True):
# No-op: simply ignore adding the instance.
pass
def commit(self):
# Raise an exception to simulate failure when attempting a write.
raise RuntimeError("DummySession does not support commit operations.")
def refresh(self, _instance):
# Raise an exception to simulate failure when attempting to refresh.
raise RuntimeError("DummySession does not support refresh operations.")
def rollback(self):
# No-op: there's nothing to roll back.
pass
def close(self):
# No-op: nothing to close.
pass
def dummy_session_factory():
return DummySession()
SessionLocal = dummy_session_factory
# Declarative base class for ORM models.
Base = declarative_base()
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