@opengis/fastify-table/dist/server/plugins/cron/funcs/verifyUnique.js

core-plugins

import { createHash } from "node:crypto";
import config from "../../../../config.js";
import getRedis from "../../redis/funcs/getRedis.js";
const md5 = (string) => createHash("md5").update(string).digest("hex");
const rclient = getRedis();
export default async function verifyUnique(name) {
    if (!config.redis)
        return true; // skip if redis is disabled
    const cronId = config.port || 3000 + md5(name);
    // one per node check
    const key = `cron:unique:${cronId}`;
    const unique = await rclient.setnx(key, 1);
    const ttl = await rclient.ttl(key);
    if (!unique && ttl !== -1) {
        return false;
    }
    await rclient.expire(key, 20);
    return true;
}