import logging
from datetime import datetime
from typing import Optional
import os

def get_current_timestamp() -> str:
    """Get current timestamp in ISO format."""
    return datetime.utcnow().isoformat()

def validate_environment_vars(required_vars: list) -> bool:
    """Validate that required environment variables are set."""
    missing_vars = []
    for var in required_vars:
        if not os.getenv(var):
            missing_vars.append(var)
    
    if missing_vars:
        print(f"Missing required environment variables: {', '.join(missing_vars)}")
        return False
    
    return True