FastAPI + Celery Template

Production-ready FastAPI application with Celery task processing. Includes health checks, task triggers, worker monitoring, and Railway deployment support.

Manual Deployment

1. Add Redis to your Railway project

   New → Database → Add Redis
   

2. Deploy this service

   New → GitHub Repo → Select this repository
   

3. Set environment variables

   REDIS_URL = ${{Redis.REDIS_URL}}
   

4. Deploy! Railway will automatically detect the Dockerfile

Deploy with Worker and Beat

For full functionality, deploy all three templates:

1. This FastAPI template (API)
2. Celery Worker template (processes tasks)
3. Celery Beat template (schedules tasks)

All should share the same Redis instance via ${{Redis.REDIS_URL}}.

Customization

Adding New Endpoints

Edit app/main.py:

@app.post("/your-endpoint")
async def your_endpoint(data: YourModel):
    # Your logic here
    task_id = trigger_your_task(data)
    return {"task_id": task_id}

Adding New Tasks

1. Define task signature in app/tasks.py:

your_task = celery_app.signature("your_task")

def trigger_your_task(data):
    result = your_task.delay(data)
    return result.id

2. Implement the actual task in the worker template

Configuration

Edit app/config.py to add more settings:

class Settings(BaseSettings):
    # Add your settings here
    database_url: str = ""
    api_key: str = ""

Testing

# Install dev dependencies
pip install -e ".[dev]"

# Run tests
pytest

# With coverage
pytest --cov=app tests/

API Documentation

Swagger UI: http://localhost:8000/docs | ReDoc: http://localhost:8000/redoc

Common Use Cases

Email sending, image processing, data exports, webhook handling, notifications.

Troubleshooting

Redis connection failed

# Check Redis is running
docker ps | grep redis

# Test connection
redis-cli -u $REDIS_URL ping

Workers not visible

Deploy the worker template and ensure it shares the same REDIS_URL

Tasks not processing

1. Ensure worker service is running
2. Check worker logs for errors
3. Verify Redis connectivity

License

MIT