async-retry

Retrying made simple, easy, and async.

Usage

// Packages
const retry = require('async-retry');
const fetch = require('node-fetch');

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'));
      return;
    }

    const data = await res.text();
    return data.substr(0, 500);
  },
  {
    retries: 5,
  }
);

API

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

• 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 true.

  • onRetry: an optional Function that is invoked after a new retry is performed. It's passed the Error that triggered it as a parameter.

Authors

• Guillermo Rauch (@rauchg) - Vercel

• Leo Lamprecht (@notquiteleo) - Vercel