@dyaa/async-retry

@dyaa/async-retry

Problem

We needed a utility that helps us to retry an async function on it's Failure/Rejection and to be able to control the number of retries and the time interval between each retry also to block the retries in case of some logic provided.

Installation

yarn add @dyaa/async-retry

Or if you prefer npm!

npm i @dyaa/async-retry

Usage

import asyncRetry from '@dyaa/async-retry';

asyncRetry expects two parameters

• The first parameter is a function that returns a Promise.
• The second parameter is an options object (all of them are optional).

Options	Type	Optional?	Default	Description
retries	number	:heavy_check_mark:	5retries	number of retries
interval	number	:heavy_check_mark:	5000ms	base interval between retries
dontRetry	function	:heavy_check_mark:	() => false	A function that returns a boolean value. This boolean value is to check if we want the retry to continue or not
onComplete	function	:heavy_check_mark:	null	A hook function that's called on the completion of the retry also provides (err, count) in params
onFailure	function	:heavy_check_mark:	null	A hook function that's called on the failure of the retry also provides (err) in params
onRetry	function	:heavy_check_mark:	null	A hook function that's called on every retry also provides (err, count) in params

Example

import asyncRetry from '@dyaa/async-retry';

const tryFetch = () => fetch('http://www.mocky.io/v2/5c59705d320000f31eba3880')
  .then(res => {
    if (res.status !== 200) {
      return Promise.reject(new Error(`Rejected because of statusCode is ${res.status}`));
    }

    return res.json();
  }).catch(e => Promise.reject(new Error(e)));

asyncRetry(tryFetch, { 
  retries: 3,
  onRetry: (err, count) => console.log(`#### Retry #${count} with ${err}.`),
  onComplete: count => console.log(`#### Completed after ${count} retries.`),
  onFailure: err => console.log(`#### Failed because ${err}.`),
})
  .then(response => {
    console.log({response})
  })
  .catch(console.error);

Inspiration

• README structure Kent C. Dodds's Tweet

Thanks

• Christian Gill for reviewing and providing support.

License

MIT License © dyaa