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

superagent-load-balancer

v2.0.3

Published

load balancer plugin for superagent

Downloads

17,022

Readme

superagent-load-balancer

Build Status Coverage Status npm Github Releases

Load balancer plugin for superagent

Installation

$ npm install superagent-load-balancer

Examples

View the ./examples directory for working examples.

API

get

  • backends the backend list

    • name The name of backend

    • host The host of backend

    • protocol The protocol, optional, default is 'http'

    • ip The ip of backend, optional

    • port The port of backend, optional

    • weight The weight of backend, it is for 'round-robin'

    • backup Set the backend as backup, optional

  • type balance algorithm: url, leastconn, round-robin, first, url-path, default is round-robin

const request = require('superagent');
const Balancer = require('superagent-load-balancer');
const balancer = new Balancer([
  {
    host: 'domain.com',
    ip: '192.168.1.1',
    port: 8080,
    weight: 10,
  },
  {
    host: 'domain.com',
    ip: '192.168.1.2',
    port: 8080,
    weight: 2,
  },
]);
const plugin = balancer.plugin();

request.get('/user')
  .use(plugin)
  .then((res) => {
    console.info(res.body);
  })
  .catch(console.error);

startHealthCheck

  • options {ping: function, interval: ms}

    • ping ping function, the function will return promise. If resolve, the backend is healthy. If reject, the backend is sick.

    • ms check interval

    • window each check the total count of ping

    • threshold each check the healthy count is bigger than threshold, the backend is healthy. Otherwise is sick

const request = require('superagent');
const Balancer = require('superagent-load-balancer');
const balancer = new Balancer([
  {
    host: 'domain1.com',
    weight: 10,
  },
  {
    host: 'domain2.com',
    weight: 2,
  },
]);
const ping = (backend) => {
  const url = `http://${backend.host}/ping`;
  return request.get(url).timeout(300);
};
balancer.startHealthCheck({
  ping,
});

const plugin = balancer.plugin();

request.get('/user')
  .use(plugin)
  .then((res) => {
    console.info(res.body);
  }).catch(console.error);

on

Add listener function to healthy or sick event

const request = require('superagent');
const Balancer = require('superagent-load-balancer');
const balancer = new Balancer([
  {
    host: 'domain1.com',
    weight: 10,
  },
  {
    host: 'domain2.com',
    weight: 2,
  },
]);
const ping = (backend) => {
  const url = `http://${backend.host}/ping`;
  return request.get(url).timeout(300);
};
balancer.startHealthCheck({
  ping,
});

balancer.on('healthy', (server) => {
  console.info(server);
});
balancer.on('sick', (server) => {
  console.info(server);
});

const plugin = balancer.plugin();

request.get('/user')
  .use(plugin)
  .then((res) => {
    console.info(res.body);
  }).catch(console.error);

getAvailableServers

Get the available server list. It is not disabled and backup.

const request = require('superagent');
const Balancer = require('superagent-load-balancer');
const balancer = new Balancer([
  {
    host: 'domain1.com',
    weight: 10,
  },
  {
    host: 'domain2.com',
    weight: 2,
    backup: true,
  },
]);
const ping = (backend) => {
  const url = `http://${backend.host}/ping`;
  return request.get(url).timeout(300);
};
balancer.startHealthCheck({
  ping,
});
// [ { id: '51d27b36cb9c34ff', host: 'domain1.com', weight: 10 } ]
console.info(balancer.getAvailableServers());

addAlgorithm

Add the custom load balance algorithm

  • name The algorithm's name

  • fn The algorithm, it should return an integer.

const request = require('superagent');
const Balancer = require('superagent-load-balancer');
const balancer = new Balancer([
  {
    host: 'domain1.com',
  },
  {
    host: 'domain2.com',
  },
], 'getByUrl');
balancer.addAlgorithm('getByUrl', (request) => {
  return request.url.length;
});

const plugin = balancer.plugin();

request.get('/user')
  .use(plugin)
  .then((res) => {
    console.info(res.body);
  })
  .catch(console.error);

License

MIT