@opengis/fastify-table/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;
}