Javascript circuit breaker function wrapper

cb.js

/**
 * Circuit breaker function wrapper.
 * 
 * @param {*} afn       An async function.
 * @param {*} retries   Number of retries before tripping the breaker.
 * @param {*} delay     Time in ms to wait before calling 'afn' again.
 * @returns             An async function wrapper around 'afn'.
 */
function cb(afn, retries = 3, delay = 1000) {
    let tripped = false;
    let fname = afn.toString().substring(0, 100).replace(/\s+/, " ").split("{")[0].trim();
    return async function(...params) {
        if (tripped) return;
        let retry = 0;
        while (retry < retries) {
            try {
                if (retry > 0) await sleep(delay);
                return await afn(...params);
            }
            catch (err) {
                retry++;
                console.warn(
                        `BREAKER (${retry}/${retries}): '${fname}' | ${err.message}`);
            }
        }
        tripped = true;
        console.error(`BREAKER TRIPPED: '${fname}'`);
    }
}

async function sleep(ms) {
    return new Promise(r => setTimeout(r, ms));
}

module.exports = cb;