Example jsforce Retry Expired Token

index.js

const Promise = require('bluebird');
const retry = require('bluebird-retry');

class AuthError extends Error {
    constructor(message) {
        super(message);
    }
}

let count = 0;
function testFunction() {
    console.log(`Called ${count} times`);
    count++;
    if (count == 1) {
        return Promise.reject(new Error('Fail the first time'));
    } else if(count == 2) {
        return Promise.reject(new AuthError('Token Expired'));
    } else {
        return Promise.resolve({message:'succeeded the third time', token:'abc123'});
    }
}

function getToken() {
    return retry(testFunction, {max_retries: 3, interval: 500, backoff: 2, predicate: (err) => !(err instanceof AuthError)})
        .then(result => {
            console.log(result);
            return result.token;
        })
        .catch(AuthError, err => {
            console.log('Auth Expired');
            count = 3; // simulate resetting the auth
            return getToken(); // rerun get Token
        });
}

getToken()
    .then(token => {
       console.log(`Token: ${token}`);
    });

package.json

{
  "name": "promises",
  "version": "1.0.0",
  "main": "index.js",
  "scripts": {
    "start": "node index.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Alex Lapinski",
  "license": "MIT",
  "description": "",
  "dependencies": {
    "bluebird": "^3.5.0",
    "bluebird-retry": "^0.11.0"
  }
}