typed-utilities/build/exponentialBackOff.js

Strongly typed general purpose utilities

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.exponentialBackOffDelay = exports.exponentialBackOff = void 0;

var _sleep = require("./sleep");

const exponentialBackOffDelay = (baseInterval, factor, iteration) => iteration === 0 ? 0 : Math.random() * Math.pow(factor, iteration + 1) * baseInterval;

exports.exponentialBackOffDelay = exponentialBackOffDelay;

const exponentialBackOff = async (baseInterval, factor, deadline, fn) => {
  for (let iteration = 0; true; iteration++) {
    const nextDelay = exponentialBackOffDelay(baseInterval, factor, iteration);

    if (Date.now() + nextDelay > deadline) {
      return null;
    }

    await (0, _sleep.sleep)(nextDelay);
    const now = Date.now();
    const value = await fn(iteration, now);

    if (value !== null) {
      return value;
    }
  }
};

exports.exponentialBackOff = exponentialBackOff;
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