78 lines
2.5 KiB
JavaScript
78 lines
2.5 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _eachSeries = require('./eachSeries.js');
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var _eachSeries2 = _interopRequireDefault(_eachSeries);
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var _wrapAsync = require('./internal/wrapAsync.js');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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var _awaitify = require('./internal/awaitify.js');
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var _awaitify2 = _interopRequireDefault(_awaitify);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* It runs each task in series but stops whenever any of the functions were
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* successful. If one of the tasks were successful, the `callback` will be
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* passed the result of the successful task. If all tasks fail, the callback
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* will be passed the error and result (if any) of the final attempt.
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*
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* @name tryEach
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @category Control Flow
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* @param {Array|Iterable|AsyncIterable|Object} tasks - A collection containing functions to
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* run, each function is passed a `callback(err, result)` it must call on
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* completion with an error `err` (which can be `null`) and an optional `result`
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* value.
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* @param {Function} [callback] - An optional callback which is called when one
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* of the tasks has succeeded, or all have failed. It receives the `err` and
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* `result` arguments of the last attempt at completing the `task`. Invoked with
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* (err, results).
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* @returns {Promise} a promise, if no callback is passed
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* @example
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* async.tryEach([
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* function getDataFromFirstWebsite(callback) {
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* // Try getting the data from the first website
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* callback(err, data);
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* },
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* function getDataFromSecondWebsite(callback) {
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* // First website failed,
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* // Try getting the data from the backup website
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* callback(err, data);
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* }
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* ],
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* // optional callback
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* function(err, results) {
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* Now do something with the data.
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* });
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*
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*/
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function tryEach(tasks, callback) {
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var error = null;
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var result;
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return (0, _eachSeries2.default)(tasks, (task, taskCb) => {
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(0, _wrapAsync2.default)(task)((err, ...args) => {
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if (err === false) return taskCb(err);
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if (args.length < 2) {
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[result] = args;
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} else {
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result = args;
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}
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error = err;
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taskCb(err ? null : {});
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});
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}, () => callback(error, result));
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}
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exports.default = (0, _awaitify2.default)(tryEach);
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module.exports = exports.default;
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