import { execFile } from "node:child_process";
import LRUCache from "lru-cache";

const cache = new LRUCache({
	max: 500,
	ttl: 1000 * 60 * 5,
});

export default async function bgpq4(asSet: string): Promise<number[]> {
	if (cache.has(asSet)) return cache.get(asSet) as number[];
	const answer: { as: number[] } = await new Promise((resolve) => {
		execFile("bgpq4", ["-tjl", "as", "-L", "6", asSet], (error, stdout) => {
			if (error) {
				throw error;
			}
			resolve(JSON.parse(stdout));
		});
	});
	cache.set(asSet, answer.as);
	return answer.as;
}