https://github.com/louislam/uptime-kuma/issues/5872

uptime-kuma-reproduce-5872.cjs

// For https://github.com/louislam/uptime-kuma/issues/5872

const {Cron} = require("croner");
const fibonacci = (n) => n < 1 ? 0 : n <= 2 ? 1 : fibonacci(n - 1) + fibonacci(n - 2);

function main() {
    new CronerTester("*/5 * * * * *", {}, "Task1");
    new CronerTester("* * * * * *", { interval: 5 }, "Task2");

    setInterval(() => {
        console.time("fibonacci");
        fibonacci(43);
        console.timeEnd("fibonacci");
    }, 1000)
}

class CronerTester {
    expectedNextRuns = [];

    constructor(cronExpression, options, name) {
        const cron = new Cron(cronExpression, options, () => {
            const actualRunTime = new Date();
            //greenLog(`[${name}] CronJob started at ${actualRunTime.toLocaleTimeString()}`);

            const nextRuns = cron.nextRuns(2);

            if (this.expectedNextRuns.length > 0) {
                // Check if it call started at the expected time

                const expectedTimestamp = Math.floor(this.expectedNextRuns[0].getTime() / 1000)
                const actualTimestamp = Math.floor(actualRunTime.getTime() / 1000);

                if (expectedTimestamp !== actualTimestamp) {
                    warnLog(`[${name}] Delayed, expected: ${this.expectedNextRuns[0].toLocaleTimeString()}`);
                }

                // Check if the next run time is drifting
                if (nextRuns[0].getTime() !== this.expectedNextRuns[1].getTime()) {
                    errorLog(`[${name}] Next run time is drifting to ${nextRuns[0].toLocaleTimeString()} from ${this.expectedNextRuns[1].toLocaleTimeString()}`);
                }
            }

            this.expectedNextRuns = nextRuns;
            //infoLog(`[${name}] Next runs:`, this.expectedNextRuns.map((date) => date.toLocaleTimeString()).join(", "));
        });
    }
}

// Red Color console.log
function errorLog(...args) {
    console.error("\x1b[31m", ...args, "\x1b[0m");
}

// Yellow Color console.log
function warnLog(...args) {
    console.warn("\x1b[33m", ...args, "\x1b[0m");
}

// Grey Color console.log
function infoLog(...args) {
    console.info("\x1b[90m", ...args, "\x1b[0m");
}

// Green Color console.log
function greenLog(...args) {
    console.log("\x1b[32m", ...args, "\x1b[0m");
}

main();