Retrying made simple, easy and async
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Latest commit 17eb4d2 Sep 7, 2018

README.md

async-retry

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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 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.

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