gmiroshnykov / async-retry

Retrying made simple, easy, async

async-retry

Retrying made simple, easy, async.

How to use

import retry from 'async-retry';
import fetch from 'node-fetch';

export default async function getSomething () {
  return await retry(async bail => {
    // if anything throws, we retry
    const res = await fetch('https://google.com');

    if (403 === res.status) {
      // don't retry upon 403
      bail(new Error('Unauthorized'));
    }

    const data = await res.text();
    return data.substr(0, 500);
  }, { retries: 500 });
}

API

retry(retrier : Function, opts : Object) => Promise

• Exported as default. Use import retry from 'async-retry' (ES6) or require('async-retry').default (legacy).
• The supplied function can be async or not. In other words, it can be a function that returns a Promise or a value.
• The supplied function receives two parameters
  1. A Function you can invoke to abort the retrying (bail)
  2. A Number identifying the attempt. The absolute first attempt (before any retries) is 1.
• The opts are passed to node-retry. Read its docs
  • retries: The maximum amount of times to retry the operation. Default is 10.
  • factor: The exponential factor to use. Default is 2.
  • minTimeout: The number of milliseconds before starting the first retry. Default is 1000.
  • maxTimeout: The maximum number of milliseconds between two retries. Default is Infinity.
  • randomize: Randomizes the timeouts by multiplying with a factor between 1 to 2. Default is false.
  • onRetry: an optional Function that is invoked after a new retry is performed. It's passed the Error that triggered it as a parameter.

Credits

• Copyright © 2016 Zeit, Inc and project authors.
• Licensed under MIT.
• ▲