app.py

import os
import subprocess
import secrets
import string

def generate_secure_string(length=32):
    """Generate a secure random string."""
    alphabet = string.ascii_letters + string.digits
    return ''.join(secrets.choice(alphabet) for _ in range(length))

def run_langfuse():
    # Hardcoded configuration with dynamically generated secrets
    env_vars = {
        # Postgres database - using SQLite as a simple alternative
        'DATABASE_URL': 'file:///data/langfuse.db',
        
        # Dynamically generated secrets
        'NEXTAUTH_URL': 'https://chris4k-langfuse.hf.space',
        'NEXTAUTH_SECRET': generate_secure_string(64),
        'SALT': generate_secure_string(32),
        'ENCRYPTION_KEY': secrets.token_hex(32),  # 64-character hex string
        
        # Additional configuration
        'HOSTNAME': '0.0.0.0',
        'PORT': '3000',
        
        # Disable signup if needed
        'AUTH_DISABLE_SIGNUP': 'false',
        
        # Optional: Initial user creation
        'LANGFUSE_INIT_USER_EMAIL': 'admin@example.com',
        'LANGFUSE_INIT_USER_PASSWORD': generate_secure_string(12),
    }

    # Pull Langfuse Docker image
    subprocess.run(['docker', 'pull', 'langfuse/langfuse:2'], check=True)

    # Prepare Docker run command
    docker_cmd = [
        'docker', 'run', '-d',
        '-p', '3000:3000',
        '-v', '/data:/data'  # Persist data
    ]

    # Add environment variables
    for key, value in env_vars.items():
        docker_cmd.extend(['-e', f'{key}={value}'])

    docker_cmd.append('langfuse/langfuse:2')

    # Run the container
    subprocess.run(docker_cmd, check=True)

    print("Langfuse is running!")
    print(f"Initial admin email: {env_vars['LANGFUSE_INIT_USER_EMAIL']}")
    print(f"Initial admin password: {env_vars['LANGFUSE_INIT_USER_PASSWORD']}")

if __name__ == "__main__":
    run_langfuse()