npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

tryloop

v2.0.2

Published

Simple library for retrying operations, it supports multiple backoff strategies.

Downloads

217

Readme

TryLoop

Simple library for retrying operations, it supports multiple backoff strategies.

Install

npm install --save tryloop

Usage

You'll have to provide the options.fn function, which will be the operation to retry.

  • If the function throws, TryLoop will throw.
  • If the function returns undefined, or a Promise which resolves to undefined, the operation will be retried.
  • If the function returns any other value, or a Promise which resolves to any other value, TryLoop will return a Promise to that value.
  • If the function can't be retried any longer, e.g. maybe the timeout run out or we hit the max retries limit, TryLoop will return undefined.

There are multiple backoff/retry strategies implemented, each with its own particular retry logic.

In general you're going to use the library like this:

import tryloop from 'tryloop';

const instance = tryloop.__strategy_name__ ({
  fn: () => {}, // Operation to retry
  // Other options...
});

const result = await instance.start ();

// instance.stop (); // Stops retrying the operation
// instance.cancel (); // Just an alias for "stop"

Strategies

Linear

The linear strategy retries the operation after a fixed interval.

These are the accepted options:

type Options = {
  fn: () => any, // Operation to retry
  timeout: number, // Return undefined after this timeout
  tries: number, // Return undefined after this number of tries
  interval: number // Fixed interval between retries
};

You can use it like so:

import tryloop from 'tryloop';

const instance = tryloop.linear ({
  fn: () => {}, // Operation to retry
  timeout: 10000, // Time out after 10s
  tries: 100, // Not more than 100 tries
  interval: 100 // Wait 100ms between retries
});

const value = await instance.start ();

Idle

The idle strategy retries the operation by calling requestIdleCallback.

These are the accepted options:

type Options = {
  fn: () => any, // Operation to retry
  timeout: number, // Return undefined after this timeout
  tries: number // Return undefined after this number of tries
};

You can use it like so:

import tryloop from 'tryloop';

const instance = tryloop.idle ({
  fn: () => {}, // Operation to retry
  timeout: 10000, // Time out after 10s
  tries: 100 // Not more than 100 tries
});

const value = await instance.start ();

Exponential

The exponential strategy retries the operation with exponentially increasing intervals.

These are the accepted options:

type Options = {
  fn: () => any, // Operation to retry
  timeout: number, // Return undefined after this timeout
  tries: number, // Return undefined after this number of tries
  factor: number, // Base factor which will be exponentiated after each try
  minInterval: number, // Minimum interval between retries, also starting interval
  maxInterval: number // Maximum interval between retries
};

You can use it like so:

import tryloop from 'tryloop';

const instance = tryloop.exponential ({
  fn: () => {}, // Operation to retry
  timeout: 10000, // Time out after 10s
  tries: 100, // Not more than 100 tries
  factor: 2, // Base factor
  minInterval: 1, // Start with 1ms
  maxInterval: 1000 // No more than 1s between retries
});

const value = await instance.start ();

requestAnimationFrame

The idle strategy retries the operation by calling requestAnimationFrame.

These are the accepted options:

type Options = {
  fn: () => any, // Operation to retry
  timeout: number, // Return undefined after this timeout
  tries: number // Return undefined after this number of tries
};

You can use it like so:

import tryloop from 'tryloop';

const instance = tryloop.raf ({
  fn: () => {}, // Operation to retry
  timeout: 10000, // Time out after 10s
  tries: 100 // Not more than 100 tries
});

const value = await instance.start ();

License

MIT © Fabio Spampinato