"""Caching to avoid duplicate requests."""
from typing import Dict, Optional
import hashlib

_cache: Dict[str, any] = {}


def get_cache_key(url: str) -> str:
    """Generate cache key from URL."""
    return hashlib.md5(url.encode()).hexdigest()


def get_cached(url: str) -> Optional[any]:
    """Get cached response."""
    return _cache.get(get_cache_key(url))


def set_cached(url: str, data: any):
    """Cache response."""
    _cache[get_cache_key(url)] = data


def clear_cache():
    """Clear all cached data."""
    _cache.clear()