Fix Supervisor startup errors and improve application resilience
- Update Supervisor configuration to use python -m uvicorn for reliable module loading - Fix database path resolution using absolute paths - Add in-memory SQLite database option for testing and when file access is problematic - Improve error handling in database connection module - Enhance logging configuration with more detailed output - Add environment variables and documentation for better configuration options - Update troubleshooting guide with common issues and solutions
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README.md
25
README.md
@ -25,6 +25,8 @@ The application uses the following environment variables (see `.env.example` for
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- `SECRET_KEY`: Secret key for JWT token encryption (default provided for development)
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- `ACCESS_TOKEN_EXPIRE_MINUTES`: JWT token expiration time in minutes (default: 60 * 24 * 8 = 8 days)
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- `PORT`: Port number for the application to listen on (default: 8000)
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- `USE_IN_MEMORY_DB`: Set to "true" to use an in-memory SQLite database (useful for testing or when file access is problematic)
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- `LOG_LEVEL`: Logging level (e.g., DEBUG, INFO, WARNING, ERROR) - defaults to INFO
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## Installation
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@ -184,16 +186,31 @@ supervisorctl restart app-8001
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To view logs:
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```bash
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tail -f /tmp/app-8001.log # Application logs
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tail -f /tmp/app-8001-error.log # Error logs
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tail -f /tmp/app-8001.log # Application logs (contains both stdout and stderr with redirect_stderr=true)
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```
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## Troubleshooting
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If you encounter issues with the application starting up:
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1. Check the error logs: `tail -f /tmp/app-8001-error.log`
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1. Check the error logs: `tail -f /tmp/app-8001.log`
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2. Verify the database path is correct and accessible
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3. Ensure all environment variables are properly set
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4. Check permissions for the storage directory
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5. Try running the application directly with uvicorn to see detailed error messages
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5. Try using the in-memory database option for testing: `USE_IN_MEMORY_DB=true`
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6. Run the application directly with uvicorn to see detailed error messages: `python -m uvicorn main:app --log-level debug`
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7. Check your Python environment and installed packages: `pip list`
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### Common Issues and Solutions
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#### Database Access Problems
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If you encounter database access issues, you can set `USE_IN_MEMORY_DB=true` in your .env file to use an in-memory SQLite database instead of a file-based one. This can help isolate whether the issue is with file permissions or database configuration.
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#### Supervisor Configuration
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If Supervisor fails to start the application:
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- Make sure the paths in supervisord.conf are correct
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- Check that the PYTHONPATH environment variable is set correctly
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- Verify that Supervisor has permission to run the application
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- Use `python -m uvicorn` instead of just `uvicorn` to ensure the Python module path is correct
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@ -20,13 +20,15 @@ class Settings(BaseSettings):
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ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 8 # 8 days
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# SQLite settings
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# Main database location
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DB_DIR = Path("app/storage/db") # Relative path for better compatibility
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# Main database location - use absolute path for reliability
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DB_DIR = Path(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))) / "app" / "storage" / "db"
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DB_DIR.mkdir(parents=True, exist_ok=True)
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SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR.absolute()}/db.sqlite"
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SQLALCHEMY_DATABASE_URL: str = f"sqlite:///{DB_DIR}/db.sqlite"
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# Alternative SQLite connection using memory for testing if file access is an issue
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# SQLALCHEMY_DATABASE_URL: str = "sqlite://" # In-memory SQLite database
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# Fallback to in-memory SQLite if file access fails
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USE_IN_MEMORY_DB: bool = os.getenv("USE_IN_MEMORY_DB", "").lower() in ("true", "1", "yes")
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if USE_IN_MEMORY_DB:
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SQLALCHEMY_DATABASE_URL = "sqlite://" # In-memory SQLite database
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# CORS settings
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BACKEND_CORS_ORIGINS: List[AnyHttpUrl] = []
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@ -1,4 +1,5 @@
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import logging
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import os
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import sys
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from pydantic import BaseModel
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@ -8,8 +9,8 @@ class LogConfig(BaseModel):
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"""Logging configuration to be set for the server"""
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LOGGER_NAME: str = "blogging_api"
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LOG_FORMAT: str = "%(levelprefix)s | %(asctime)s | %(message)s"
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LOG_LEVEL: str = "INFO"
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LOG_FORMAT: str = "%(levelprefix)s | %(asctime)s | %(name)s | %(message)s"
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LOG_LEVEL: str = os.getenv("LOG_LEVEL", "INFO").upper()
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# Logging config
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version: int = 1
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@ -20,16 +21,30 @@ class LogConfig(BaseModel):
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"fmt": LOG_FORMAT,
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"datefmt": "%Y-%m-%d %H:%M:%S",
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},
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"detailed": {
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"()": "uvicorn.logging.DefaultFormatter",
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"fmt": "%(levelprefix)s | %(asctime)s | %(name)s | %(filename)s:%(lineno)d | %(message)s",
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"datefmt": "%Y-%m-%d %H:%M:%S",
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}
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}
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handlers: dict = {
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"default": {
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"formatter": "default",
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"class": "logging.StreamHandler",
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"stream": sys.stderr,
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"stream": sys.stdout, # Use stdout instead of stderr for better supervisor compatibility
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},
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"detailed": {
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"formatter": "detailed",
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"class": "logging.StreamHandler",
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"stream": sys.stdout,
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}
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}
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loggers: dict = {
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LOGGER_NAME: {"handlers": ["default"], "level": LOG_LEVEL},
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LOGGER_NAME: {"handlers": ["default"], "level": LOG_LEVEL, "propagate": False},
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"uvicorn": {"handlers": ["default"], "level": LOG_LEVEL, "propagate": False},
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"sqlalchemy": {"handlers": ["detailed"], "level": LOG_LEVEL, "propagate": False},
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"app": {"handlers": ["default"], "level": LOG_LEVEL, "propagate": False},
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"db": {"handlers": ["detailed"], "level": LOG_LEVEL, "propagate": False},
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}
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@ -7,33 +7,61 @@ from app.core.logging import get_logger
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logger = get_logger("db.session")
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# Create engine with better error handling
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try:
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logger.info(f"Creating database engine with URL: {settings.SQLALCHEMY_DATABASE_URL}")
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engine = create_engine(
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settings.SQLALCHEMY_DATABASE_URL,
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connect_args={"check_same_thread": False},
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pool_pre_ping=True, # Ensure connections are still alive
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)
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# Wrap in function for easier error handling and retries
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def create_db_engine():
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# Use in-memory database if configured or as fallback
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if settings.USE_IN_MEMORY_DB:
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logger.info("Using in-memory SQLite database")
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db_url = "sqlite://"
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connect_args = {"check_same_thread": False}
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else:
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logger.info(f"Using file-based SQLite database at: {settings.SQLALCHEMY_DATABASE_URL}")
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db_url = settings.SQLALCHEMY_DATABASE_URL
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connect_args = {"check_same_thread": False}
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# Add engine event listeners for debugging
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@event.listens_for(engine, "connect")
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def on_connect(dbapi_connection, connection_record):
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logger.info("Database connection established")
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@event.listens_for(engine, "engine_connect")
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def on_engine_connect(connection):
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logger.info("Engine connected")
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SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
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# Test connection on startup
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with engine.connect() as conn:
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logger.info("Database connection test successful")
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# Create engine with better error handling
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try:
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engine = create_engine(
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db_url,
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connect_args=connect_args,
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pool_pre_ping=True, # Ensure connections are still alive
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)
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except SQLAlchemyError as e:
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logger.error(f"Database connection error: {e}", exc_info=True)
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# Don't re-raise to allow fallback mechanisms
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# Add engine event listeners for debugging
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@event.listens_for(engine, "connect")
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def on_connect(dbapi_connection, connection_record):
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logger.info("Database connection established")
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@event.listens_for(engine, "engine_connect")
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def on_engine_connect(connection):
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logger.info("Engine connected")
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# Test connection
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with engine.connect() as conn:
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conn.execute("SELECT 1")
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logger.info("Database connection test successful")
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return engine
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except SQLAlchemyError as e:
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logger.error(f"Database connection error: {e}", exc_info=True)
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# Fall back to in-memory SQLite if file access failed
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if not settings.USE_IN_MEMORY_DB:
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logger.info("Falling back to in-memory SQLite database")
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return create_engine(
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"sqlite://",
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connect_args={"check_same_thread": False}
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)
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# Re-raise if in-memory DB was already the target
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raise
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# Initialize engine
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try:
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engine = create_db_engine()
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SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
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except Exception as e:
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logger.error(f"Failed to initialize database engine: {e}", exc_info=True)
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engine = None
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SessionLocal = None
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# Dependency to get DB session
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13
main.py
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main.py
@ -46,9 +46,20 @@ app.include_router(api_router)
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@app.on_event("startup")
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async def startup_event():
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logger.info("Application starting up...")
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# Print current working directory and environment for debugging
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import os
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import sys
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logger.info(f"Current working directory: {os.getcwd()}")
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logger.info(f"Python path: {sys.path}")
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logger.info(f"Environment: {os.environ.get('PYTHONPATH', 'Not set')}")
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# Make sure we can initialize database connection
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try:
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logger.info("Database engine initialized successfully")
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from app.db.session import SessionLocal
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if SessionLocal:
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logger.info("Database engine initialized successfully")
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else:
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logger.warning("Database session is None - check connection settings")
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except Exception as e:
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logger.error(f"Failed to initialize database: {e}", exc_info=True)
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# We allow the app to start even with DB errors, to avoid restart loops
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@ -7,16 +7,16 @@ loglevel=info
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pidfile=/tmp/supervisord.pid
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[program:app-8001]
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command=uvicorn main:app --host 0.0.0.0 --port 8001
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command=python -m uvicorn main:app --host 0.0.0.0 --port 8001 --log-level debug
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directory=/projects/bloggingapi-a05jzl
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autostart=true
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autorestart=true
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startretries=5
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startretries=3
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numprocs=1
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startsecs=1
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redirect_stderr=false
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startsecs=2
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# Use either redirect_stderr or stderr_logfile, not both
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redirect_stderr=true
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stdout_logfile=/tmp/app-8001.log
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stderr_logfile=/tmp/app-8001-error.log
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stdout_logfile_maxbytes=50MB
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stdout_logfile_backups=10
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environment=PORT=8001,PYTHONUNBUFFERED=1
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environment=PORT=8001,PYTHONUNBUFFERED=1,PYTHONPATH=/projects/bloggingapi-a05jzl
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