export type RateLimiter = {
  limit(options: { key: string }): Promise<{ success: boolean }>;
};

export async function allowRequest(
  limiter: RateLimiter | undefined,
  key: string,
): Promise<boolean> {
  if (!limiter) return true;
  try {
    const { success } = await limiter.limit({ key });
    return success;
  } catch {
    // Fail open if the binding misbehaves in local/dev.
    return true;
  }
}

export function clientIp(request: Request): string {
  return request.headers.get("CF-Connecting-IP") ?? "unknown";
}