bbo/retry.js

bbo is a utility library of zero dependencies for javascript.

'use strict';

/* eslint-disable prefer-promise-reject-errors */

/**
 * @param {any} attempt
 * @param {any} options
 *  interval: 200,  //ms
 *  retries: 2
 *  timeout: 8000 //ms
 */
function retry (attempt, options) {
  var option = options || {};
  var interval = option.interval || 400;
  var retries = option.retries || 2;
  var timeout = option.timeout || 8000;

  function rejectDelay(reason) {
    return new Promise(function (resolve, reject) {
      setTimeout(reject.bind(null, reason), interval);
    });
  }

  var p = Promise.reject();

  for (var i = 0; i < retries; i++) {
    p = p.catch(timeoutReject(attempt, timeout)).catch(rejectDelay);
  }

  return p;
}

function timeoutReject(task, timeout) {
  var timer;
  return function () {
    return Promise.race([Promise.reject().catch(task), new Promise(function (rs, rj) {
      timer = setTimeout(function () {
        rj('timeout.');
      }, timeout || 8000);
    })]).then(function (r) {
      clearTimeout(timer);
      return r;
    }, function (err) {
      return Promise.reject(err);
    });
  };
}

module.exports = retry;