105 lines
3.1 KiB
JavaScript
105 lines
3.1 KiB
JavaScript
'use strict';
|
|
|
|
Object.defineProperty(exports, "__esModule", {
|
|
value: true
|
|
});
|
|
|
|
var _once = require('./internal/once.js');
|
|
|
|
var _once2 = _interopRequireDefault(_once);
|
|
|
|
var _onlyOnce = require('./internal/onlyOnce.js');
|
|
|
|
var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
|
|
|
|
var _wrapAsync = require('./internal/wrapAsync.js');
|
|
|
|
var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
|
|
|
|
var _awaitify = require('./internal/awaitify.js');
|
|
|
|
var _awaitify2 = _interopRequireDefault(_awaitify);
|
|
|
|
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
|
|
|
/**
|
|
* Runs the `tasks` array of functions in series, each passing their results to
|
|
* the next in the array. However, if any of the `tasks` pass an error to their
|
|
* own callback, the next function is not executed, and the main `callback` is
|
|
* immediately called with the error.
|
|
*
|
|
* @name waterfall
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {Array} tasks - An array of [async functions]{@link AsyncFunction}
|
|
* to run.
|
|
* Each function should complete with any number of `result` values.
|
|
* The `result` values will be passed as arguments, in order, to the next task.
|
|
* @param {Function} [callback] - An optional callback to run once all the
|
|
* functions have completed. This will be passed the results of the last task's
|
|
* callback. Invoked with (err, [results]).
|
|
* @returns {Promise} a promise, if a callback is omitted
|
|
* @example
|
|
*
|
|
* async.waterfall([
|
|
* function(callback) {
|
|
* callback(null, 'one', 'two');
|
|
* },
|
|
* function(arg1, arg2, callback) {
|
|
* // arg1 now equals 'one' and arg2 now equals 'two'
|
|
* callback(null, 'three');
|
|
* },
|
|
* function(arg1, callback) {
|
|
* // arg1 now equals 'three'
|
|
* callback(null, 'done');
|
|
* }
|
|
* ], function (err, result) {
|
|
* // result now equals 'done'
|
|
* });
|
|
*
|
|
* // Or, with named functions:
|
|
* async.waterfall([
|
|
* myFirstFunction,
|
|
* mySecondFunction,
|
|
* myLastFunction,
|
|
* ], function (err, result) {
|
|
* // result now equals 'done'
|
|
* });
|
|
* function myFirstFunction(callback) {
|
|
* callback(null, 'one', 'two');
|
|
* }
|
|
* function mySecondFunction(arg1, arg2, callback) {
|
|
* // arg1 now equals 'one' and arg2 now equals 'two'
|
|
* callback(null, 'three');
|
|
* }
|
|
* function myLastFunction(arg1, callback) {
|
|
* // arg1 now equals 'three'
|
|
* callback(null, 'done');
|
|
* }
|
|
*/
|
|
function waterfall(tasks, callback) {
|
|
callback = (0, _once2.default)(callback);
|
|
if (!Array.isArray(tasks)) return callback(new Error('First argument to waterfall must be an array of functions'));
|
|
if (!tasks.length) return callback();
|
|
var taskIndex = 0;
|
|
|
|
function nextTask(args) {
|
|
var task = (0, _wrapAsync2.default)(tasks[taskIndex++]);
|
|
task(...args, (0, _onlyOnce2.default)(next));
|
|
}
|
|
|
|
function next(err, ...args) {
|
|
if (err === false) return;
|
|
if (err || taskIndex === tasks.length) {
|
|
return callback(err, ...args);
|
|
}
|
|
nextTask(args);
|
|
}
|
|
|
|
nextTask([]);
|
|
}
|
|
|
|
exports.default = (0, _awaitify2.default)(waterfall);
|
|
module.exports = exports['default']; |