5610 lines
181 KiB
JavaScript
Vendored
5610 lines
181 KiB
JavaScript
Vendored
(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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typeof define === 'function' && define.amd ? define(['exports'], factory) :
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(factory((global.async = global.async || {})));
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}(this, (function (exports) { 'use strict';
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function slice(arrayLike, start) {
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start = start|0;
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var newLen = Math.max(arrayLike.length - start, 0);
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var newArr = Array(newLen);
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for(var idx = 0; idx < newLen; idx++) {
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newArr[idx] = arrayLike[start + idx];
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}
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return newArr;
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}
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/**
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* Creates a continuation function with some arguments already applied.
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*
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* Useful as a shorthand when combined with other control flow functions. Any
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* arguments passed to the returned function are added to the arguments
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* originally passed to apply.
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*
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* @name apply
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* @static
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* @memberOf module:Utils
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* @method
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* @category Util
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* @param {Function} fn - The function you want to eventually apply all
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* arguments to. Invokes with (arguments...).
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* @param {...*} arguments... - Any number of arguments to automatically apply
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* when the continuation is called.
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* @returns {Function} the partially-applied function
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* @example
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*
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* // using apply
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* async.parallel([
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* async.apply(fs.writeFile, 'testfile1', 'test1'),
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* async.apply(fs.writeFile, 'testfile2', 'test2')
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* ]);
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*
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*
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* // the same process without using apply
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* async.parallel([
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* function(callback) {
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* fs.writeFile('testfile1', 'test1', callback);
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* },
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* function(callback) {
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* fs.writeFile('testfile2', 'test2', callback);
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* }
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* ]);
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*
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* // It's possible to pass any number of additional arguments when calling the
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* // continuation:
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*
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* node> var fn = async.apply(sys.puts, 'one');
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* node> fn('two', 'three');
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* one
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* two
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* three
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*/
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var apply = function(fn/*, ...args*/) {
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var args = slice(arguments, 1);
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return function(/*callArgs*/) {
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var callArgs = slice(arguments);
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return fn.apply(null, args.concat(callArgs));
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};
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};
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var initialParams = function (fn) {
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return function (/*...args, callback*/) {
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var args = slice(arguments);
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var callback = args.pop();
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fn.call(this, args, callback);
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};
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};
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/**
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* Checks if `value` is the
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* [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
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* of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
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*
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* @static
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* @memberOf _
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* @since 0.1.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is an object, else `false`.
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* @example
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*
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* _.isObject({});
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* // => true
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*
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* _.isObject([1, 2, 3]);
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* // => true
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*
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* _.isObject(_.noop);
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* // => true
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*
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* _.isObject(null);
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* // => false
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*/
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function isObject(value) {
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var type = typeof value;
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return value != null && (type == 'object' || type == 'function');
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}
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var hasSetImmediate = typeof setImmediate === 'function' && setImmediate;
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var hasNextTick = typeof process === 'object' && typeof process.nextTick === 'function';
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function fallback(fn) {
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setTimeout(fn, 0);
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}
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function wrap(defer) {
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return function (fn/*, ...args*/) {
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var args = slice(arguments, 1);
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defer(function () {
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fn.apply(null, args);
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});
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};
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}
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var _defer;
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if (hasSetImmediate) {
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_defer = setImmediate;
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} else if (hasNextTick) {
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_defer = process.nextTick;
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} else {
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_defer = fallback;
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}
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var setImmediate$1 = wrap(_defer);
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/**
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* Take a sync function and make it async, passing its return value to a
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* callback. This is useful for plugging sync functions into a waterfall,
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* series, or other async functions. Any arguments passed to the generated
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* function will be passed to the wrapped function (except for the final
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* callback argument). Errors thrown will be passed to the callback.
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*
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* If the function passed to `asyncify` returns a Promise, that promises's
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* resolved/rejected state will be used to call the callback, rather than simply
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* the synchronous return value.
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*
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* This also means you can asyncify ES2017 `async` functions.
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*
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* @name asyncify
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* @static
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* @memberOf module:Utils
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* @method
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* @alias wrapSync
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* @category Util
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* @param {Function} func - The synchronous function, or Promise-returning
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* function to convert to an {@link AsyncFunction}.
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* @returns {AsyncFunction} An asynchronous wrapper of the `func`. To be
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* invoked with `(args..., callback)`.
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* @example
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*
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* // passing a regular synchronous function
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* async.waterfall([
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* async.apply(fs.readFile, filename, "utf8"),
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* async.asyncify(JSON.parse),
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* function (data, next) {
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* // data is the result of parsing the text.
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* // If there was a parsing error, it would have been caught.
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* }
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* ], callback);
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*
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* // passing a function returning a promise
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* async.waterfall([
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* async.apply(fs.readFile, filename, "utf8"),
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* async.asyncify(function (contents) {
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* return db.model.create(contents);
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* }),
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* function (model, next) {
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* // `model` is the instantiated model object.
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* // If there was an error, this function would be skipped.
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* }
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* ], callback);
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*
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* // es2017 example, though `asyncify` is not needed if your JS environment
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* // supports async functions out of the box
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* var q = async.queue(async.asyncify(async function(file) {
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* var intermediateStep = await processFile(file);
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* return await somePromise(intermediateStep)
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* }));
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*
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* q.push(files);
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*/
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function asyncify(func) {
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return initialParams(function (args, callback) {
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var result;
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try {
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result = func.apply(this, args);
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} catch (e) {
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return callback(e);
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}
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// if result is Promise object
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if (isObject(result) && typeof result.then === 'function') {
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result.then(function(value) {
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invokeCallback(callback, null, value);
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}, function(err) {
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invokeCallback(callback, err.message ? err : new Error(err));
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});
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} else {
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callback(null, result);
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}
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});
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}
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function invokeCallback(callback, error, value) {
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try {
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callback(error, value);
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} catch (e) {
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setImmediate$1(rethrow, e);
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}
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}
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function rethrow(error) {
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throw error;
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}
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var supportsSymbol = typeof Symbol === 'function';
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function isAsync(fn) {
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return supportsSymbol && fn[Symbol.toStringTag] === 'AsyncFunction';
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}
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function wrapAsync(asyncFn) {
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return isAsync(asyncFn) ? asyncify(asyncFn) : asyncFn;
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}
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function applyEach$1(eachfn) {
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return function(fns/*, ...args*/) {
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var args = slice(arguments, 1);
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var go = initialParams(function(args, callback) {
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var that = this;
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return eachfn(fns, function (fn, cb) {
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wrapAsync(fn).apply(that, args.concat(cb));
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}, callback);
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});
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if (args.length) {
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return go.apply(this, args);
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}
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else {
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return go;
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}
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};
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}
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/** Detect free variable `global` from Node.js. */
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var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
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/** Detect free variable `self`. */
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var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
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/** Used as a reference to the global object. */
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var root = freeGlobal || freeSelf || Function('return this')();
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/** Built-in value references. */
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var Symbol$1 = root.Symbol;
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/**
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* Used to resolve the
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* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
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* of values.
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*/
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var nativeObjectToString = objectProto.toString;
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/** Built-in value references. */
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var symToStringTag$1 = Symbol$1 ? Symbol$1.toStringTag : undefined;
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/**
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* A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
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*
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* @private
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* @param {*} value The value to query.
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* @returns {string} Returns the raw `toStringTag`.
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*/
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function getRawTag(value) {
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var isOwn = hasOwnProperty.call(value, symToStringTag$1),
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tag = value[symToStringTag$1];
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try {
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value[symToStringTag$1] = undefined;
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var unmasked = true;
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} catch (e) {}
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var result = nativeObjectToString.call(value);
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if (unmasked) {
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if (isOwn) {
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value[symToStringTag$1] = tag;
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} else {
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delete value[symToStringTag$1];
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}
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}
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return result;
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}
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/** Used for built-in method references. */
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var objectProto$1 = Object.prototype;
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/**
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* Used to resolve the
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* [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
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* of values.
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*/
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var nativeObjectToString$1 = objectProto$1.toString;
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/**
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* Converts `value` to a string using `Object.prototype.toString`.
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*
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* @private
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* @param {*} value The value to convert.
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* @returns {string} Returns the converted string.
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*/
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function objectToString(value) {
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return nativeObjectToString$1.call(value);
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}
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/** `Object#toString` result references. */
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var nullTag = '[object Null]';
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var undefinedTag = '[object Undefined]';
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/** Built-in value references. */
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var symToStringTag = Symbol$1 ? Symbol$1.toStringTag : undefined;
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|
/**
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* The base implementation of `getTag` without fallbacks for buggy environments.
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*
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* @private
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* @param {*} value The value to query.
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* @returns {string} Returns the `toStringTag`.
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*/
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function baseGetTag(value) {
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if (value == null) {
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return value === undefined ? undefinedTag : nullTag;
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}
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return (symToStringTag && symToStringTag in Object(value))
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? getRawTag(value)
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: objectToString(value);
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}
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/** `Object#toString` result references. */
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var asyncTag = '[object AsyncFunction]';
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var funcTag = '[object Function]';
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var genTag = '[object GeneratorFunction]';
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var proxyTag = '[object Proxy]';
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|
/**
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|
* Checks if `value` is classified as a `Function` object.
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*
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* @static
|
|
* @memberOf _
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|
* @since 0.1.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a function, else `false`.
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* @example
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*
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* _.isFunction(_);
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* // => true
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*
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* _.isFunction(/abc/);
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* // => false
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*/
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function isFunction(value) {
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if (!isObject(value)) {
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return false;
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}
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// The use of `Object#toString` avoids issues with the `typeof` operator
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// in Safari 9 which returns 'object' for typed arrays and other constructors.
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var tag = baseGetTag(value);
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return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
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}
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|
/** Used as references for various `Number` constants. */
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|
var MAX_SAFE_INTEGER = 9007199254740991;
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|
|
/**
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|
* Checks if `value` is a valid array-like length.
|
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*
|
|
* **Note:** This method is loosely based on
|
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* [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 4.0.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
|
|
* @example
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|
*
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* _.isLength(3);
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* // => true
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*
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* _.isLength(Number.MIN_VALUE);
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* // => false
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*
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* _.isLength(Infinity);
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* // => false
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*
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* _.isLength('3');
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* // => false
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*/
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function isLength(value) {
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return typeof value == 'number' &&
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value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
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}
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|
|
/**
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* Checks if `value` is array-like. A value is considered array-like if it's
|
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* not a function and has a `value.length` that's an integer greater than or
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* equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 4.0.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is array-like, else `false`.
|
|
* @example
|
|
*
|
|
* _.isArrayLike([1, 2, 3]);
|
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* // => true
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|
*
|
|
* _.isArrayLike(document.body.children);
|
|
* // => true
|
|
*
|
|
* _.isArrayLike('abc');
|
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* // => true
|
|
*
|
|
* _.isArrayLike(_.noop);
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* // => false
|
|
*/
|
|
function isArrayLike(value) {
|
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return value != null && isLength(value.length) && !isFunction(value);
|
|
}
|
|
|
|
// A temporary value used to identify if the loop should be broken.
|
|
// See #1064, #1293
|
|
var breakLoop = {};
|
|
|
|
/**
|
|
* This method returns `undefined`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 2.3.0
|
|
* @category Util
|
|
* @example
|
|
*
|
|
* _.times(2, _.noop);
|
|
* // => [undefined, undefined]
|
|
*/
|
|
function noop() {
|
|
// No operation performed.
|
|
}
|
|
|
|
function once(fn) {
|
|
return function () {
|
|
if (fn === null) return;
|
|
var callFn = fn;
|
|
fn = null;
|
|
callFn.apply(this, arguments);
|
|
};
|
|
}
|
|
|
|
var iteratorSymbol = typeof Symbol === 'function' && Symbol.iterator;
|
|
|
|
var getIterator = function (coll) {
|
|
return iteratorSymbol && coll[iteratorSymbol] && coll[iteratorSymbol]();
|
|
};
|
|
|
|
/**
|
|
* The base implementation of `_.times` without support for iteratee shorthands
|
|
* or max array length checks.
|
|
*
|
|
* @private
|
|
* @param {number} n The number of times to invoke `iteratee`.
|
|
* @param {Function} iteratee The function invoked per iteration.
|
|
* @returns {Array} Returns the array of results.
|
|
*/
|
|
function baseTimes(n, iteratee) {
|
|
var index = -1,
|
|
result = Array(n);
|
|
|
|
while (++index < n) {
|
|
result[index] = iteratee(index);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is object-like. A value is object-like if it's not `null`
|
|
* and has a `typeof` result of "object".
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 4.0.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is object-like, else `false`.
|
|
* @example
|
|
*
|
|
* _.isObjectLike({});
|
|
* // => true
|
|
*
|
|
* _.isObjectLike([1, 2, 3]);
|
|
* // => true
|
|
*
|
|
* _.isObjectLike(_.noop);
|
|
* // => false
|
|
*
|
|
* _.isObjectLike(null);
|
|
* // => false
|
|
*/
|
|
function isObjectLike(value) {
|
|
return value != null && typeof value == 'object';
|
|
}
|
|
|
|
/** `Object#toString` result references. */
|
|
var argsTag = '[object Arguments]';
|
|
|
|
/**
|
|
* The base implementation of `_.isArguments`.
|
|
*
|
|
* @private
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is an `arguments` object,
|
|
*/
|
|
function baseIsArguments(value) {
|
|
return isObjectLike(value) && baseGetTag(value) == argsTag;
|
|
}
|
|
|
|
/** Used for built-in method references. */
|
|
var objectProto$3 = Object.prototype;
|
|
|
|
/** Used to check objects for own properties. */
|
|
var hasOwnProperty$2 = objectProto$3.hasOwnProperty;
|
|
|
|
/** Built-in value references. */
|
|
var propertyIsEnumerable = objectProto$3.propertyIsEnumerable;
|
|
|
|
/**
|
|
* Checks if `value` is likely an `arguments` object.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 0.1.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is an `arguments` object,
|
|
* else `false`.
|
|
* @example
|
|
*
|
|
* _.isArguments(function() { return arguments; }());
|
|
* // => true
|
|
*
|
|
* _.isArguments([1, 2, 3]);
|
|
* // => false
|
|
*/
|
|
var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
|
|
return isObjectLike(value) && hasOwnProperty$2.call(value, 'callee') &&
|
|
!propertyIsEnumerable.call(value, 'callee');
|
|
};
|
|
|
|
/**
|
|
* Checks if `value` is classified as an `Array` object.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 0.1.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is an array, else `false`.
|
|
* @example
|
|
*
|
|
* _.isArray([1, 2, 3]);
|
|
* // => true
|
|
*
|
|
* _.isArray(document.body.children);
|
|
* // => false
|
|
*
|
|
* _.isArray('abc');
|
|
* // => false
|
|
*
|
|
* _.isArray(_.noop);
|
|
* // => false
|
|
*/
|
|
var isArray = Array.isArray;
|
|
|
|
/**
|
|
* This method returns `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 4.13.0
|
|
* @category Util
|
|
* @returns {boolean} Returns `false`.
|
|
* @example
|
|
*
|
|
* _.times(2, _.stubFalse);
|
|
* // => [false, false]
|
|
*/
|
|
function stubFalse() {
|
|
return false;
|
|
}
|
|
|
|
/** Detect free variable `exports`. */
|
|
var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
|
|
|
|
/** Detect free variable `module`. */
|
|
var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
|
|
|
|
/** Detect the popular CommonJS extension `module.exports`. */
|
|
var moduleExports = freeModule && freeModule.exports === freeExports;
|
|
|
|
/** Built-in value references. */
|
|
var Buffer = moduleExports ? root.Buffer : undefined;
|
|
|
|
/* Built-in method references for those with the same name as other `lodash` methods. */
|
|
var nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined;
|
|
|
|
/**
|
|
* Checks if `value` is a buffer.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 4.3.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
|
|
* @example
|
|
*
|
|
* _.isBuffer(new Buffer(2));
|
|
* // => true
|
|
*
|
|
* _.isBuffer(new Uint8Array(2));
|
|
* // => false
|
|
*/
|
|
var isBuffer = nativeIsBuffer || stubFalse;
|
|
|
|
/** Used as references for various `Number` constants. */
|
|
var MAX_SAFE_INTEGER$1 = 9007199254740991;
|
|
|
|
/** Used to detect unsigned integer values. */
|
|
var reIsUint = /^(?:0|[1-9]\d*)$/;
|
|
|
|
/**
|
|
* Checks if `value` is a valid array-like index.
|
|
*
|
|
* @private
|
|
* @param {*} value The value to check.
|
|
* @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
|
|
* @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
|
|
*/
|
|
function isIndex(value, length) {
|
|
var type = typeof value;
|
|
length = length == null ? MAX_SAFE_INTEGER$1 : length;
|
|
|
|
return !!length &&
|
|
(type == 'number' ||
|
|
(type != 'symbol' && reIsUint.test(value))) &&
|
|
(value > -1 && value % 1 == 0 && value < length);
|
|
}
|
|
|
|
/** `Object#toString` result references. */
|
|
var argsTag$1 = '[object Arguments]';
|
|
var arrayTag = '[object Array]';
|
|
var boolTag = '[object Boolean]';
|
|
var dateTag = '[object Date]';
|
|
var errorTag = '[object Error]';
|
|
var funcTag$1 = '[object Function]';
|
|
var mapTag = '[object Map]';
|
|
var numberTag = '[object Number]';
|
|
var objectTag = '[object Object]';
|
|
var regexpTag = '[object RegExp]';
|
|
var setTag = '[object Set]';
|
|
var stringTag = '[object String]';
|
|
var weakMapTag = '[object WeakMap]';
|
|
|
|
var arrayBufferTag = '[object ArrayBuffer]';
|
|
var dataViewTag = '[object DataView]';
|
|
var float32Tag = '[object Float32Array]';
|
|
var float64Tag = '[object Float64Array]';
|
|
var int8Tag = '[object Int8Array]';
|
|
var int16Tag = '[object Int16Array]';
|
|
var int32Tag = '[object Int32Array]';
|
|
var uint8Tag = '[object Uint8Array]';
|
|
var uint8ClampedTag = '[object Uint8ClampedArray]';
|
|
var uint16Tag = '[object Uint16Array]';
|
|
var uint32Tag = '[object Uint32Array]';
|
|
|
|
/** Used to identify `toStringTag` values of typed arrays. */
|
|
var typedArrayTags = {};
|
|
typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
|
|
typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
|
|
typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
|
|
typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
|
|
typedArrayTags[uint32Tag] = true;
|
|
typedArrayTags[argsTag$1] = typedArrayTags[arrayTag] =
|
|
typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
|
|
typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
|
|
typedArrayTags[errorTag] = typedArrayTags[funcTag$1] =
|
|
typedArrayTags[mapTag] = typedArrayTags[numberTag] =
|
|
typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
|
|
typedArrayTags[setTag] = typedArrayTags[stringTag] =
|
|
typedArrayTags[weakMapTag] = false;
|
|
|
|
/**
|
|
* The base implementation of `_.isTypedArray` without Node.js optimizations.
|
|
*
|
|
* @private
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
|
|
*/
|
|
function baseIsTypedArray(value) {
|
|
return isObjectLike(value) &&
|
|
isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
|
|
}
|
|
|
|
/**
|
|
* The base implementation of `_.unary` without support for storing metadata.
|
|
*
|
|
* @private
|
|
* @param {Function} func The function to cap arguments for.
|
|
* @returns {Function} Returns the new capped function.
|
|
*/
|
|
function baseUnary(func) {
|
|
return function(value) {
|
|
return func(value);
|
|
};
|
|
}
|
|
|
|
/** Detect free variable `exports`. */
|
|
var freeExports$1 = typeof exports == 'object' && exports && !exports.nodeType && exports;
|
|
|
|
/** Detect free variable `module`. */
|
|
var freeModule$1 = freeExports$1 && typeof module == 'object' && module && !module.nodeType && module;
|
|
|
|
/** Detect the popular CommonJS extension `module.exports`. */
|
|
var moduleExports$1 = freeModule$1 && freeModule$1.exports === freeExports$1;
|
|
|
|
/** Detect free variable `process` from Node.js. */
|
|
var freeProcess = moduleExports$1 && freeGlobal.process;
|
|
|
|
/** Used to access faster Node.js helpers. */
|
|
var nodeUtil = (function() {
|
|
try {
|
|
// Use `util.types` for Node.js 10+.
|
|
var types = freeModule$1 && freeModule$1.require && freeModule$1.require('util').types;
|
|
|
|
if (types) {
|
|
return types;
|
|
}
|
|
|
|
// Legacy `process.binding('util')` for Node.js < 10.
|
|
return freeProcess && freeProcess.binding && freeProcess.binding('util');
|
|
} catch (e) {}
|
|
}());
|
|
|
|
/* Node.js helper references. */
|
|
var nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;
|
|
|
|
/**
|
|
* Checks if `value` is classified as a typed array.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 3.0.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
|
|
* @example
|
|
*
|
|
* _.isTypedArray(new Uint8Array);
|
|
* // => true
|
|
*
|
|
* _.isTypedArray([]);
|
|
* // => false
|
|
*/
|
|
var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;
|
|
|
|
/** Used for built-in method references. */
|
|
var objectProto$2 = Object.prototype;
|
|
|
|
/** Used to check objects for own properties. */
|
|
var hasOwnProperty$1 = objectProto$2.hasOwnProperty;
|
|
|
|
/**
|
|
* Creates an array of the enumerable property names of the array-like `value`.
|
|
*
|
|
* @private
|
|
* @param {*} value The value to query.
|
|
* @param {boolean} inherited Specify returning inherited property names.
|
|
* @returns {Array} Returns the array of property names.
|
|
*/
|
|
function arrayLikeKeys(value, inherited) {
|
|
var isArr = isArray(value),
|
|
isArg = !isArr && isArguments(value),
|
|
isBuff = !isArr && !isArg && isBuffer(value),
|
|
isType = !isArr && !isArg && !isBuff && isTypedArray(value),
|
|
skipIndexes = isArr || isArg || isBuff || isType,
|
|
result = skipIndexes ? baseTimes(value.length, String) : [],
|
|
length = result.length;
|
|
|
|
for (var key in value) {
|
|
if ((inherited || hasOwnProperty$1.call(value, key)) &&
|
|
!(skipIndexes && (
|
|
// Safari 9 has enumerable `arguments.length` in strict mode.
|
|
key == 'length' ||
|
|
// Node.js 0.10 has enumerable non-index properties on buffers.
|
|
(isBuff && (key == 'offset' || key == 'parent')) ||
|
|
// PhantomJS 2 has enumerable non-index properties on typed arrays.
|
|
(isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
|
|
// Skip index properties.
|
|
isIndex(key, length)
|
|
))) {
|
|
result.push(key);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/** Used for built-in method references. */
|
|
var objectProto$5 = Object.prototype;
|
|
|
|
/**
|
|
* Checks if `value` is likely a prototype object.
|
|
*
|
|
* @private
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
|
|
*/
|
|
function isPrototype(value) {
|
|
var Ctor = value && value.constructor,
|
|
proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto$5;
|
|
|
|
return value === proto;
|
|
}
|
|
|
|
/**
|
|
* Creates a unary function that invokes `func` with its argument transformed.
|
|
*
|
|
* @private
|
|
* @param {Function} func The function to wrap.
|
|
* @param {Function} transform The argument transform.
|
|
* @returns {Function} Returns the new function.
|
|
*/
|
|
function overArg(func, transform) {
|
|
return function(arg) {
|
|
return func(transform(arg));
|
|
};
|
|
}
|
|
|
|
/* Built-in method references for those with the same name as other `lodash` methods. */
|
|
var nativeKeys = overArg(Object.keys, Object);
|
|
|
|
/** Used for built-in method references. */
|
|
var objectProto$4 = Object.prototype;
|
|
|
|
/** Used to check objects for own properties. */
|
|
var hasOwnProperty$3 = objectProto$4.hasOwnProperty;
|
|
|
|
/**
|
|
* The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
|
|
*
|
|
* @private
|
|
* @param {Object} object The object to query.
|
|
* @returns {Array} Returns the array of property names.
|
|
*/
|
|
function baseKeys(object) {
|
|
if (!isPrototype(object)) {
|
|
return nativeKeys(object);
|
|
}
|
|
var result = [];
|
|
for (var key in Object(object)) {
|
|
if (hasOwnProperty$3.call(object, key) && key != 'constructor') {
|
|
result.push(key);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates an array of the own enumerable property names of `object`.
|
|
*
|
|
* **Note:** Non-object values are coerced to objects. See the
|
|
* [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
|
|
* for more details.
|
|
*
|
|
* @static
|
|
* @since 0.1.0
|
|
* @memberOf _
|
|
* @category Object
|
|
* @param {Object} object The object to query.
|
|
* @returns {Array} Returns the array of property names.
|
|
* @example
|
|
*
|
|
* function Foo() {
|
|
* this.a = 1;
|
|
* this.b = 2;
|
|
* }
|
|
*
|
|
* Foo.prototype.c = 3;
|
|
*
|
|
* _.keys(new Foo);
|
|
* // => ['a', 'b'] (iteration order is not guaranteed)
|
|
*
|
|
* _.keys('hi');
|
|
* // => ['0', '1']
|
|
*/
|
|
function keys(object) {
|
|
return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
|
|
}
|
|
|
|
function createArrayIterator(coll) {
|
|
var i = -1;
|
|
var len = coll.length;
|
|
return function next() {
|
|
return ++i < len ? {value: coll[i], key: i} : null;
|
|
}
|
|
}
|
|
|
|
function createES2015Iterator(iterator) {
|
|
var i = -1;
|
|
return function next() {
|
|
var item = iterator.next();
|
|
if (item.done)
|
|
return null;
|
|
i++;
|
|
return {value: item.value, key: i};
|
|
}
|
|
}
|
|
|
|
function createObjectIterator(obj) {
|
|
var okeys = keys(obj);
|
|
var i = -1;
|
|
var len = okeys.length;
|
|
return function next() {
|
|
var key = okeys[++i];
|
|
return i < len ? {value: obj[key], key: key} : null;
|
|
};
|
|
}
|
|
|
|
function iterator(coll) {
|
|
if (isArrayLike(coll)) {
|
|
return createArrayIterator(coll);
|
|
}
|
|
|
|
var iterator = getIterator(coll);
|
|
return iterator ? createES2015Iterator(iterator) : createObjectIterator(coll);
|
|
}
|
|
|
|
function onlyOnce(fn) {
|
|
return function() {
|
|
if (fn === null) throw new Error("Callback was already called.");
|
|
var callFn = fn;
|
|
fn = null;
|
|
callFn.apply(this, arguments);
|
|
};
|
|
}
|
|
|
|
function _eachOfLimit(limit) {
|
|
return function (obj, iteratee, callback) {
|
|
callback = once(callback || noop);
|
|
if (limit <= 0 || !obj) {
|
|
return callback(null);
|
|
}
|
|
var nextElem = iterator(obj);
|
|
var done = false;
|
|
var running = 0;
|
|
var looping = false;
|
|
|
|
function iterateeCallback(err, value) {
|
|
running -= 1;
|
|
if (err) {
|
|
done = true;
|
|
callback(err);
|
|
}
|
|
else if (value === breakLoop || (done && running <= 0)) {
|
|
done = true;
|
|
return callback(null);
|
|
}
|
|
else if (!looping) {
|
|
replenish();
|
|
}
|
|
}
|
|
|
|
function replenish () {
|
|
looping = true;
|
|
while (running < limit && !done) {
|
|
var elem = nextElem();
|
|
if (elem === null) {
|
|
done = true;
|
|
if (running <= 0) {
|
|
callback(null);
|
|
}
|
|
return;
|
|
}
|
|
running += 1;
|
|
iteratee(elem.value, elem.key, onlyOnce(iterateeCallback));
|
|
}
|
|
looping = false;
|
|
}
|
|
|
|
replenish();
|
|
};
|
|
}
|
|
|
|
/**
|
|
* The same as [`eachOf`]{@link module:Collections.eachOf} but runs a maximum of `limit` async operations at a
|
|
* time.
|
|
*
|
|
* @name eachOfLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.eachOf]{@link module:Collections.eachOf}
|
|
* @alias forEachOfLimit
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each
|
|
* item in `coll`. The `key` is the item's key, or index in the case of an
|
|
* array.
|
|
* Invoked with (item, key, callback).
|
|
* @param {Function} [callback] - A callback which is called when all
|
|
* `iteratee` functions have finished, or an error occurs. Invoked with (err).
|
|
*/
|
|
function eachOfLimit(coll, limit, iteratee, callback) {
|
|
_eachOfLimit(limit)(coll, wrapAsync(iteratee), callback);
|
|
}
|
|
|
|
function doLimit(fn, limit) {
|
|
return function (iterable, iteratee, callback) {
|
|
return fn(iterable, limit, iteratee, callback);
|
|
};
|
|
}
|
|
|
|
// eachOf implementation optimized for array-likes
|
|
function eachOfArrayLike(coll, iteratee, callback) {
|
|
callback = once(callback || noop);
|
|
var index = 0,
|
|
completed = 0,
|
|
length = coll.length;
|
|
if (length === 0) {
|
|
callback(null);
|
|
}
|
|
|
|
function iteratorCallback(err, value) {
|
|
if (err) {
|
|
callback(err);
|
|
} else if ((++completed === length) || value === breakLoop) {
|
|
callback(null);
|
|
}
|
|
}
|
|
|
|
for (; index < length; index++) {
|
|
iteratee(coll[index], index, onlyOnce(iteratorCallback));
|
|
}
|
|
}
|
|
|
|
// a generic version of eachOf which can handle array, object, and iterator cases.
|
|
var eachOfGeneric = doLimit(eachOfLimit, Infinity);
|
|
|
|
/**
|
|
* Like [`each`]{@link module:Collections.each}, except that it passes the key (or index) as the second argument
|
|
* to the iteratee.
|
|
*
|
|
* @name eachOf
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @alias forEachOf
|
|
* @category Collection
|
|
* @see [async.each]{@link module:Collections.each}
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - A function to apply to each
|
|
* item in `coll`.
|
|
* The `key` is the item's key, or index in the case of an array.
|
|
* Invoked with (item, key, callback).
|
|
* @param {Function} [callback] - A callback which is called when all
|
|
* `iteratee` functions have finished, or an error occurs. Invoked with (err).
|
|
* @example
|
|
*
|
|
* var obj = {dev: "/dev.json", test: "/test.json", prod: "/prod.json"};
|
|
* var configs = {};
|
|
*
|
|
* async.forEachOf(obj, function (value, key, callback) {
|
|
* fs.readFile(__dirname + value, "utf8", function (err, data) {
|
|
* if (err) return callback(err);
|
|
* try {
|
|
* configs[key] = JSON.parse(data);
|
|
* } catch (e) {
|
|
* return callback(e);
|
|
* }
|
|
* callback();
|
|
* });
|
|
* }, function (err) {
|
|
* if (err) console.error(err.message);
|
|
* // configs is now a map of JSON data
|
|
* doSomethingWith(configs);
|
|
* });
|
|
*/
|
|
var eachOf = function(coll, iteratee, callback) {
|
|
var eachOfImplementation = isArrayLike(coll) ? eachOfArrayLike : eachOfGeneric;
|
|
eachOfImplementation(coll, wrapAsync(iteratee), callback);
|
|
};
|
|
|
|
function doParallel(fn) {
|
|
return function (obj, iteratee, callback) {
|
|
return fn(eachOf, obj, wrapAsync(iteratee), callback);
|
|
};
|
|
}
|
|
|
|
function _asyncMap(eachfn, arr, iteratee, callback) {
|
|
callback = callback || noop;
|
|
arr = arr || [];
|
|
var results = [];
|
|
var counter = 0;
|
|
var _iteratee = wrapAsync(iteratee);
|
|
|
|
eachfn(arr, function (value, _, callback) {
|
|
var index = counter++;
|
|
_iteratee(value, function (err, v) {
|
|
results[index] = v;
|
|
callback(err);
|
|
});
|
|
}, function (err) {
|
|
callback(err, results);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Produces a new collection of values by mapping each value in `coll` through
|
|
* the `iteratee` function. The `iteratee` is called with an item from `coll`
|
|
* and a callback for when it has finished processing. Each of these callback
|
|
* takes 2 arguments: an `error`, and the transformed item from `coll`. If
|
|
* `iteratee` passes an error to its callback, the main `callback` (for the
|
|
* `map` function) is immediately called with the error.
|
|
*
|
|
* Note, that since this function applies the `iteratee` to each item in
|
|
* parallel, there is no guarantee that the `iteratee` functions will complete
|
|
* in order. However, the results array will be in the same order as the
|
|
* original `coll`.
|
|
*
|
|
* If `map` is passed an Object, the results will be an Array. The results
|
|
* will roughly be in the order of the original Objects' keys (but this can
|
|
* vary across JavaScript engines).
|
|
*
|
|
* @name map
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each item in
|
|
* `coll`.
|
|
* The iteratee should complete with the transformed item.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called when all `iteratee`
|
|
* functions have finished, or an error occurs. Results is an Array of the
|
|
* transformed items from the `coll`. Invoked with (err, results).
|
|
* @example
|
|
*
|
|
* async.map(['file1','file2','file3'], fs.stat, function(err, results) {
|
|
* // results is now an array of stats for each file
|
|
* });
|
|
*/
|
|
var map = doParallel(_asyncMap);
|
|
|
|
/**
|
|
* Applies the provided arguments to each function in the array, calling
|
|
* `callback` after all functions have completed. If you only provide the first
|
|
* argument, `fns`, then it will return a function which lets you pass in the
|
|
* arguments as if it were a single function call. If more arguments are
|
|
* provided, `callback` is required while `args` is still optional.
|
|
*
|
|
* @name applyEach
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {Array|Iterable|Object} fns - A collection of {@link AsyncFunction}s
|
|
* to all call with the same arguments
|
|
* @param {...*} [args] - any number of separate arguments to pass to the
|
|
* function.
|
|
* @param {Function} [callback] - the final argument should be the callback,
|
|
* called when all functions have completed processing.
|
|
* @returns {Function} - If only the first argument, `fns`, is provided, it will
|
|
* return a function which lets you pass in the arguments as if it were a single
|
|
* function call. The signature is `(..args, callback)`. If invoked with any
|
|
* arguments, `callback` is required.
|
|
* @example
|
|
*
|
|
* async.applyEach([enableSearch, updateSchema], 'bucket', callback);
|
|
*
|
|
* // partial application example:
|
|
* async.each(
|
|
* buckets,
|
|
* async.applyEach([enableSearch, updateSchema]),
|
|
* callback
|
|
* );
|
|
*/
|
|
var applyEach = applyEach$1(map);
|
|
|
|
function doParallelLimit(fn) {
|
|
return function (obj, limit, iteratee, callback) {
|
|
return fn(_eachOfLimit(limit), obj, wrapAsync(iteratee), callback);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* The same as [`map`]{@link module:Collections.map} but runs a maximum of `limit` async operations at a time.
|
|
*
|
|
* @name mapLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.map]{@link module:Collections.map}
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each item in
|
|
* `coll`.
|
|
* The iteratee should complete with the transformed item.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called when all `iteratee`
|
|
* functions have finished, or an error occurs. Results is an array of the
|
|
* transformed items from the `coll`. Invoked with (err, results).
|
|
*/
|
|
var mapLimit = doParallelLimit(_asyncMap);
|
|
|
|
/**
|
|
* The same as [`map`]{@link module:Collections.map} but runs only a single async operation at a time.
|
|
*
|
|
* @name mapSeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.map]{@link module:Collections.map}
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each item in
|
|
* `coll`.
|
|
* The iteratee should complete with the transformed item.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called when all `iteratee`
|
|
* functions have finished, or an error occurs. Results is an array of the
|
|
* transformed items from the `coll`. Invoked with (err, results).
|
|
*/
|
|
var mapSeries = doLimit(mapLimit, 1);
|
|
|
|
/**
|
|
* The same as [`applyEach`]{@link module:ControlFlow.applyEach} but runs only a single async operation at a time.
|
|
*
|
|
* @name applyEachSeries
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.applyEach]{@link module:ControlFlow.applyEach}
|
|
* @category Control Flow
|
|
* @param {Array|Iterable|Object} fns - A collection of {@link AsyncFunction}s to all
|
|
* call with the same arguments
|
|
* @param {...*} [args] - any number of separate arguments to pass to the
|
|
* function.
|
|
* @param {Function} [callback] - the final argument should be the callback,
|
|
* called when all functions have completed processing.
|
|
* @returns {Function} - If only the first argument is provided, it will return
|
|
* a function which lets you pass in the arguments as if it were a single
|
|
* function call.
|
|
*/
|
|
var applyEachSeries = applyEach$1(mapSeries);
|
|
|
|
/**
|
|
* A specialized version of `_.forEach` for arrays without support for
|
|
* iteratee shorthands.
|
|
*
|
|
* @private
|
|
* @param {Array} [array] The array to iterate over.
|
|
* @param {Function} iteratee The function invoked per iteration.
|
|
* @returns {Array} Returns `array`.
|
|
*/
|
|
function arrayEach(array, iteratee) {
|
|
var index = -1,
|
|
length = array == null ? 0 : array.length;
|
|
|
|
while (++index < length) {
|
|
if (iteratee(array[index], index, array) === false) {
|
|
break;
|
|
}
|
|
}
|
|
return array;
|
|
}
|
|
|
|
/**
|
|
* Creates a base function for methods like `_.forIn` and `_.forOwn`.
|
|
*
|
|
* @private
|
|
* @param {boolean} [fromRight] Specify iterating from right to left.
|
|
* @returns {Function} Returns the new base function.
|
|
*/
|
|
function createBaseFor(fromRight) {
|
|
return function(object, iteratee, keysFunc) {
|
|
var index = -1,
|
|
iterable = Object(object),
|
|
props = keysFunc(object),
|
|
length = props.length;
|
|
|
|
while (length--) {
|
|
var key = props[fromRight ? length : ++index];
|
|
if (iteratee(iterable[key], key, iterable) === false) {
|
|
break;
|
|
}
|
|
}
|
|
return object;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* The base implementation of `baseForOwn` which iterates over `object`
|
|
* properties returned by `keysFunc` and invokes `iteratee` for each property.
|
|
* Iteratee functions may exit iteration early by explicitly returning `false`.
|
|
*
|
|
* @private
|
|
* @param {Object} object The object to iterate over.
|
|
* @param {Function} iteratee The function invoked per iteration.
|
|
* @param {Function} keysFunc The function to get the keys of `object`.
|
|
* @returns {Object} Returns `object`.
|
|
*/
|
|
var baseFor = createBaseFor();
|
|
|
|
/**
|
|
* The base implementation of `_.forOwn` without support for iteratee shorthands.
|
|
*
|
|
* @private
|
|
* @param {Object} object The object to iterate over.
|
|
* @param {Function} iteratee The function invoked per iteration.
|
|
* @returns {Object} Returns `object`.
|
|
*/
|
|
function baseForOwn(object, iteratee) {
|
|
return object && baseFor(object, iteratee, keys);
|
|
}
|
|
|
|
/**
|
|
* The base implementation of `_.findIndex` and `_.findLastIndex` without
|
|
* support for iteratee shorthands.
|
|
*
|
|
* @private
|
|
* @param {Array} array The array to inspect.
|
|
* @param {Function} predicate The function invoked per iteration.
|
|
* @param {number} fromIndex The index to search from.
|
|
* @param {boolean} [fromRight] Specify iterating from right to left.
|
|
* @returns {number} Returns the index of the matched value, else `-1`.
|
|
*/
|
|
function baseFindIndex(array, predicate, fromIndex, fromRight) {
|
|
var length = array.length,
|
|
index = fromIndex + (fromRight ? 1 : -1);
|
|
|
|
while ((fromRight ? index-- : ++index < length)) {
|
|
if (predicate(array[index], index, array)) {
|
|
return index;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* The base implementation of `_.isNaN` without support for number objects.
|
|
*
|
|
* @private
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
|
|
*/
|
|
function baseIsNaN(value) {
|
|
return value !== value;
|
|
}
|
|
|
|
/**
|
|
* A specialized version of `_.indexOf` which performs strict equality
|
|
* comparisons of values, i.e. `===`.
|
|
*
|
|
* @private
|
|
* @param {Array} array The array to inspect.
|
|
* @param {*} value The value to search for.
|
|
* @param {number} fromIndex The index to search from.
|
|
* @returns {number} Returns the index of the matched value, else `-1`.
|
|
*/
|
|
function strictIndexOf(array, value, fromIndex) {
|
|
var index = fromIndex - 1,
|
|
length = array.length;
|
|
|
|
while (++index < length) {
|
|
if (array[index] === value) {
|
|
return index;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* The base implementation of `_.indexOf` without `fromIndex` bounds checks.
|
|
*
|
|
* @private
|
|
* @param {Array} array The array to inspect.
|
|
* @param {*} value The value to search for.
|
|
* @param {number} fromIndex The index to search from.
|
|
* @returns {number} Returns the index of the matched value, else `-1`.
|
|
*/
|
|
function baseIndexOf(array, value, fromIndex) {
|
|
return value === value
|
|
? strictIndexOf(array, value, fromIndex)
|
|
: baseFindIndex(array, baseIsNaN, fromIndex);
|
|
}
|
|
|
|
/**
|
|
* Determines the best order for running the {@link AsyncFunction}s in `tasks`, based on
|
|
* their requirements. Each function can optionally depend on other functions
|
|
* being completed first, and each function is run as soon as its requirements
|
|
* are satisfied.
|
|
*
|
|
* If any of the {@link AsyncFunction}s pass an error to their callback, the `auto` sequence
|
|
* will stop. Further tasks will not execute (so any other functions depending
|
|
* on it will not run), and the main `callback` is immediately called with the
|
|
* error.
|
|
*
|
|
* {@link AsyncFunction}s also receive an object containing the results of functions which
|
|
* have completed so far as the first argument, if they have dependencies. If a
|
|
* task function has no dependencies, it will only be passed a callback.
|
|
*
|
|
* @name auto
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {Object} tasks - An object. Each of its properties is either a
|
|
* function or an array of requirements, with the {@link AsyncFunction} itself the last item
|
|
* in the array. The object's key of a property serves as the name of the task
|
|
* defined by that property, i.e. can be used when specifying requirements for
|
|
* other tasks. The function receives one or two arguments:
|
|
* * a `results` object, containing the results of the previously executed
|
|
* functions, only passed if the task has any dependencies,
|
|
* * a `callback(err, result)` function, which must be called when finished,
|
|
* passing an `error` (which can be `null`) and the result of the function's
|
|
* execution.
|
|
* @param {number} [concurrency=Infinity] - An optional `integer` for
|
|
* determining the maximum number of tasks that can be run in parallel. By
|
|
* default, as many as possible.
|
|
* @param {Function} [callback] - An optional callback which is called when all
|
|
* the tasks have been completed. It receives the `err` argument if any `tasks`
|
|
* pass an error to their callback. Results are always returned; however, if an
|
|
* error occurs, no further `tasks` will be performed, and the results object
|
|
* will only contain partial results. Invoked with (err, results).
|
|
* @returns undefined
|
|
* @example
|
|
*
|
|
* async.auto({
|
|
* // this function will just be passed a callback
|
|
* readData: async.apply(fs.readFile, 'data.txt', 'utf-8'),
|
|
* showData: ['readData', function(results, cb) {
|
|
* // results.readData is the file's contents
|
|
* // ...
|
|
* }]
|
|
* }, callback);
|
|
*
|
|
* async.auto({
|
|
* get_data: function(callback) {
|
|
* console.log('in get_data');
|
|
* // async code to get some data
|
|
* callback(null, 'data', 'converted to array');
|
|
* },
|
|
* make_folder: function(callback) {
|
|
* console.log('in make_folder');
|
|
* // async code to create a directory to store a file in
|
|
* // this is run at the same time as getting the data
|
|
* callback(null, 'folder');
|
|
* },
|
|
* write_file: ['get_data', 'make_folder', function(results, callback) {
|
|
* console.log('in write_file', JSON.stringify(results));
|
|
* // once there is some data and the directory exists,
|
|
* // write the data to a file in the directory
|
|
* callback(null, 'filename');
|
|
* }],
|
|
* email_link: ['write_file', function(results, callback) {
|
|
* console.log('in email_link', JSON.stringify(results));
|
|
* // once the file is written let's email a link to it...
|
|
* // results.write_file contains the filename returned by write_file.
|
|
* callback(null, {'file':results.write_file, 'email':'user@example.com'});
|
|
* }]
|
|
* }, function(err, results) {
|
|
* console.log('err = ', err);
|
|
* console.log('results = ', results);
|
|
* });
|
|
*/
|
|
var auto = function (tasks, concurrency, callback) {
|
|
if (typeof concurrency === 'function') {
|
|
// concurrency is optional, shift the args.
|
|
callback = concurrency;
|
|
concurrency = null;
|
|
}
|
|
callback = once(callback || noop);
|
|
var keys$$1 = keys(tasks);
|
|
var numTasks = keys$$1.length;
|
|
if (!numTasks) {
|
|
return callback(null);
|
|
}
|
|
if (!concurrency) {
|
|
concurrency = numTasks;
|
|
}
|
|
|
|
var results = {};
|
|
var runningTasks = 0;
|
|
var hasError = false;
|
|
|
|
var listeners = Object.create(null);
|
|
|
|
var readyTasks = [];
|
|
|
|
// for cycle detection:
|
|
var readyToCheck = []; // tasks that have been identified as reachable
|
|
// without the possibility of returning to an ancestor task
|
|
var uncheckedDependencies = {};
|
|
|
|
baseForOwn(tasks, function (task, key) {
|
|
if (!isArray(task)) {
|
|
// no dependencies
|
|
enqueueTask(key, [task]);
|
|
readyToCheck.push(key);
|
|
return;
|
|
}
|
|
|
|
var dependencies = task.slice(0, task.length - 1);
|
|
var remainingDependencies = dependencies.length;
|
|
if (remainingDependencies === 0) {
|
|
enqueueTask(key, task);
|
|
readyToCheck.push(key);
|
|
return;
|
|
}
|
|
uncheckedDependencies[key] = remainingDependencies;
|
|
|
|
arrayEach(dependencies, function (dependencyName) {
|
|
if (!tasks[dependencyName]) {
|
|
throw new Error('async.auto task `' + key +
|
|
'` has a non-existent dependency `' +
|
|
dependencyName + '` in ' +
|
|
dependencies.join(', '));
|
|
}
|
|
addListener(dependencyName, function () {
|
|
remainingDependencies--;
|
|
if (remainingDependencies === 0) {
|
|
enqueueTask(key, task);
|
|
}
|
|
});
|
|
});
|
|
});
|
|
|
|
checkForDeadlocks();
|
|
processQueue();
|
|
|
|
function enqueueTask(key, task) {
|
|
readyTasks.push(function () {
|
|
runTask(key, task);
|
|
});
|
|
}
|
|
|
|
function processQueue() {
|
|
if (readyTasks.length === 0 && runningTasks === 0) {
|
|
return callback(null, results);
|
|
}
|
|
while(readyTasks.length && runningTasks < concurrency) {
|
|
var run = readyTasks.shift();
|
|
run();
|
|
}
|
|
|
|
}
|
|
|
|
function addListener(taskName, fn) {
|
|
var taskListeners = listeners[taskName];
|
|
if (!taskListeners) {
|
|
taskListeners = listeners[taskName] = [];
|
|
}
|
|
|
|
taskListeners.push(fn);
|
|
}
|
|
|
|
function taskComplete(taskName) {
|
|
var taskListeners = listeners[taskName] || [];
|
|
arrayEach(taskListeners, function (fn) {
|
|
fn();
|
|
});
|
|
processQueue();
|
|
}
|
|
|
|
|
|
function runTask(key, task) {
|
|
if (hasError) return;
|
|
|
|
var taskCallback = onlyOnce(function(err, result) {
|
|
runningTasks--;
|
|
if (arguments.length > 2) {
|
|
result = slice(arguments, 1);
|
|
}
|
|
if (err) {
|
|
var safeResults = {};
|
|
baseForOwn(results, function(val, rkey) {
|
|
safeResults[rkey] = val;
|
|
});
|
|
safeResults[key] = result;
|
|
hasError = true;
|
|
listeners = Object.create(null);
|
|
|
|
callback(err, safeResults);
|
|
} else {
|
|
results[key] = result;
|
|
taskComplete(key);
|
|
}
|
|
});
|
|
|
|
runningTasks++;
|
|
var taskFn = wrapAsync(task[task.length - 1]);
|
|
if (task.length > 1) {
|
|
taskFn(results, taskCallback);
|
|
} else {
|
|
taskFn(taskCallback);
|
|
}
|
|
}
|
|
|
|
function checkForDeadlocks() {
|
|
// Kahn's algorithm
|
|
// https://en.wikipedia.org/wiki/Topological_sorting#Kahn.27s_algorithm
|
|
// http://connalle.blogspot.com/2013/10/topological-sortingkahn-algorithm.html
|
|
var currentTask;
|
|
var counter = 0;
|
|
while (readyToCheck.length) {
|
|
currentTask = readyToCheck.pop();
|
|
counter++;
|
|
arrayEach(getDependents(currentTask), function (dependent) {
|
|
if (--uncheckedDependencies[dependent] === 0) {
|
|
readyToCheck.push(dependent);
|
|
}
|
|
});
|
|
}
|
|
|
|
if (counter !== numTasks) {
|
|
throw new Error(
|
|
'async.auto cannot execute tasks due to a recursive dependency'
|
|
);
|
|
}
|
|
}
|
|
|
|
function getDependents(taskName) {
|
|
var result = [];
|
|
baseForOwn(tasks, function (task, key) {
|
|
if (isArray(task) && baseIndexOf(task, taskName, 0) >= 0) {
|
|
result.push(key);
|
|
}
|
|
});
|
|
return result;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* A specialized version of `_.map` for arrays without support for iteratee
|
|
* shorthands.
|
|
*
|
|
* @private
|
|
* @param {Array} [array] The array to iterate over.
|
|
* @param {Function} iteratee The function invoked per iteration.
|
|
* @returns {Array} Returns the new mapped array.
|
|
*/
|
|
function arrayMap(array, iteratee) {
|
|
var index = -1,
|
|
length = array == null ? 0 : array.length,
|
|
result = Array(length);
|
|
|
|
while (++index < length) {
|
|
result[index] = iteratee(array[index], index, array);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/** `Object#toString` result references. */
|
|
var symbolTag = '[object Symbol]';
|
|
|
|
/**
|
|
* Checks if `value` is classified as a `Symbol` primitive or object.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 4.0.0
|
|
* @category Lang
|
|
* @param {*} value The value to check.
|
|
* @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
|
|
* @example
|
|
*
|
|
* _.isSymbol(Symbol.iterator);
|
|
* // => true
|
|
*
|
|
* _.isSymbol('abc');
|
|
* // => false
|
|
*/
|
|
function isSymbol(value) {
|
|
return typeof value == 'symbol' ||
|
|
(isObjectLike(value) && baseGetTag(value) == symbolTag);
|
|
}
|
|
|
|
/** Used as references for various `Number` constants. */
|
|
var INFINITY = 1 / 0;
|
|
|
|
/** Used to convert symbols to primitives and strings. */
|
|
var symbolProto = Symbol$1 ? Symbol$1.prototype : undefined;
|
|
var symbolToString = symbolProto ? symbolProto.toString : undefined;
|
|
|
|
/**
|
|
* The base implementation of `_.toString` which doesn't convert nullish
|
|
* values to empty strings.
|
|
*
|
|
* @private
|
|
* @param {*} value The value to process.
|
|
* @returns {string} Returns the string.
|
|
*/
|
|
function baseToString(value) {
|
|
// Exit early for strings to avoid a performance hit in some environments.
|
|
if (typeof value == 'string') {
|
|
return value;
|
|
}
|
|
if (isArray(value)) {
|
|
// Recursively convert values (susceptible to call stack limits).
|
|
return arrayMap(value, baseToString) + '';
|
|
}
|
|
if (isSymbol(value)) {
|
|
return symbolToString ? symbolToString.call(value) : '';
|
|
}
|
|
var result = (value + '');
|
|
return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
|
|
}
|
|
|
|
/**
|
|
* The base implementation of `_.slice` without an iteratee call guard.
|
|
*
|
|
* @private
|
|
* @param {Array} array The array to slice.
|
|
* @param {number} [start=0] The start position.
|
|
* @param {number} [end=array.length] The end position.
|
|
* @returns {Array} Returns the slice of `array`.
|
|
*/
|
|
function baseSlice(array, start, end) {
|
|
var index = -1,
|
|
length = array.length;
|
|
|
|
if (start < 0) {
|
|
start = -start > length ? 0 : (length + start);
|
|
}
|
|
end = end > length ? length : end;
|
|
if (end < 0) {
|
|
end += length;
|
|
}
|
|
length = start > end ? 0 : ((end - start) >>> 0);
|
|
start >>>= 0;
|
|
|
|
var result = Array(length);
|
|
while (++index < length) {
|
|
result[index] = array[index + start];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Casts `array` to a slice if it's needed.
|
|
*
|
|
* @private
|
|
* @param {Array} array The array to inspect.
|
|
* @param {number} start The start position.
|
|
* @param {number} [end=array.length] The end position.
|
|
* @returns {Array} Returns the cast slice.
|
|
*/
|
|
function castSlice(array, start, end) {
|
|
var length = array.length;
|
|
end = end === undefined ? length : end;
|
|
return (!start && end >= length) ? array : baseSlice(array, start, end);
|
|
}
|
|
|
|
/**
|
|
* Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
|
|
* that is not found in the character symbols.
|
|
*
|
|
* @private
|
|
* @param {Array} strSymbols The string symbols to inspect.
|
|
* @param {Array} chrSymbols The character symbols to find.
|
|
* @returns {number} Returns the index of the last unmatched string symbol.
|
|
*/
|
|
function charsEndIndex(strSymbols, chrSymbols) {
|
|
var index = strSymbols.length;
|
|
|
|
while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
|
|
return index;
|
|
}
|
|
|
|
/**
|
|
* Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
|
|
* that is not found in the character symbols.
|
|
*
|
|
* @private
|
|
* @param {Array} strSymbols The string symbols to inspect.
|
|
* @param {Array} chrSymbols The character symbols to find.
|
|
* @returns {number} Returns the index of the first unmatched string symbol.
|
|
*/
|
|
function charsStartIndex(strSymbols, chrSymbols) {
|
|
var index = -1,
|
|
length = strSymbols.length;
|
|
|
|
while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
|
|
return index;
|
|
}
|
|
|
|
/**
|
|
* Converts an ASCII `string` to an array.
|
|
*
|
|
* @private
|
|
* @param {string} string The string to convert.
|
|
* @returns {Array} Returns the converted array.
|
|
*/
|
|
function asciiToArray(string) {
|
|
return string.split('');
|
|
}
|
|
|
|
/** Used to compose unicode character classes. */
|
|
var rsAstralRange = '\\ud800-\\udfff';
|
|
var rsComboMarksRange = '\\u0300-\\u036f';
|
|
var reComboHalfMarksRange = '\\ufe20-\\ufe2f';
|
|
var rsComboSymbolsRange = '\\u20d0-\\u20ff';
|
|
var rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange;
|
|
var rsVarRange = '\\ufe0e\\ufe0f';
|
|
|
|
/** Used to compose unicode capture groups. */
|
|
var rsZWJ = '\\u200d';
|
|
|
|
/** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
|
|
var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');
|
|
|
|
/**
|
|
* Checks if `string` contains Unicode symbols.
|
|
*
|
|
* @private
|
|
* @param {string} string The string to inspect.
|
|
* @returns {boolean} Returns `true` if a symbol is found, else `false`.
|
|
*/
|
|
function hasUnicode(string) {
|
|
return reHasUnicode.test(string);
|
|
}
|
|
|
|
/** Used to compose unicode character classes. */
|
|
var rsAstralRange$1 = '\\ud800-\\udfff';
|
|
var rsComboMarksRange$1 = '\\u0300-\\u036f';
|
|
var reComboHalfMarksRange$1 = '\\ufe20-\\ufe2f';
|
|
var rsComboSymbolsRange$1 = '\\u20d0-\\u20ff';
|
|
var rsComboRange$1 = rsComboMarksRange$1 + reComboHalfMarksRange$1 + rsComboSymbolsRange$1;
|
|
var rsVarRange$1 = '\\ufe0e\\ufe0f';
|
|
|
|
/** Used to compose unicode capture groups. */
|
|
var rsAstral = '[' + rsAstralRange$1 + ']';
|
|
var rsCombo = '[' + rsComboRange$1 + ']';
|
|
var rsFitz = '\\ud83c[\\udffb-\\udfff]';
|
|
var rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')';
|
|
var rsNonAstral = '[^' + rsAstralRange$1 + ']';
|
|
var rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}';
|
|
var rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]';
|
|
var rsZWJ$1 = '\\u200d';
|
|
|
|
/** Used to compose unicode regexes. */
|
|
var reOptMod = rsModifier + '?';
|
|
var rsOptVar = '[' + rsVarRange$1 + ']?';
|
|
var rsOptJoin = '(?:' + rsZWJ$1 + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*';
|
|
var rsSeq = rsOptVar + reOptMod + rsOptJoin;
|
|
var rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
|
|
|
|
/** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
|
|
var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
|
|
|
|
/**
|
|
* Converts a Unicode `string` to an array.
|
|
*
|
|
* @private
|
|
* @param {string} string The string to convert.
|
|
* @returns {Array} Returns the converted array.
|
|
*/
|
|
function unicodeToArray(string) {
|
|
return string.match(reUnicode) || [];
|
|
}
|
|
|
|
/**
|
|
* Converts `string` to an array.
|
|
*
|
|
* @private
|
|
* @param {string} string The string to convert.
|
|
* @returns {Array} Returns the converted array.
|
|
*/
|
|
function stringToArray(string) {
|
|
return hasUnicode(string)
|
|
? unicodeToArray(string)
|
|
: asciiToArray(string);
|
|
}
|
|
|
|
/**
|
|
* Converts `value` to a string. An empty string is returned for `null`
|
|
* and `undefined` values. The sign of `-0` is preserved.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 4.0.0
|
|
* @category Lang
|
|
* @param {*} value The value to convert.
|
|
* @returns {string} Returns the converted string.
|
|
* @example
|
|
*
|
|
* _.toString(null);
|
|
* // => ''
|
|
*
|
|
* _.toString(-0);
|
|
* // => '-0'
|
|
*
|
|
* _.toString([1, 2, 3]);
|
|
* // => '1,2,3'
|
|
*/
|
|
function toString(value) {
|
|
return value == null ? '' : baseToString(value);
|
|
}
|
|
|
|
/** Used to match leading and trailing whitespace. */
|
|
var reTrim = /^\s+|\s+$/g;
|
|
|
|
/**
|
|
* Removes leading and trailing whitespace or specified characters from `string`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 3.0.0
|
|
* @category String
|
|
* @param {string} [string=''] The string to trim.
|
|
* @param {string} [chars=whitespace] The characters to trim.
|
|
* @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
|
|
* @returns {string} Returns the trimmed string.
|
|
* @example
|
|
*
|
|
* _.trim(' abc ');
|
|
* // => 'abc'
|
|
*
|
|
* _.trim('-_-abc-_-', '_-');
|
|
* // => 'abc'
|
|
*
|
|
* _.map([' foo ', ' bar '], _.trim);
|
|
* // => ['foo', 'bar']
|
|
*/
|
|
function trim(string, chars, guard) {
|
|
string = toString(string);
|
|
if (string && (guard || chars === undefined)) {
|
|
return string.replace(reTrim, '');
|
|
}
|
|
if (!string || !(chars = baseToString(chars))) {
|
|
return string;
|
|
}
|
|
var strSymbols = stringToArray(string),
|
|
chrSymbols = stringToArray(chars),
|
|
start = charsStartIndex(strSymbols, chrSymbols),
|
|
end = charsEndIndex(strSymbols, chrSymbols) + 1;
|
|
|
|
return castSlice(strSymbols, start, end).join('');
|
|
}
|
|
|
|
var FN_ARGS = /^(?:async\s+)?(function)?\s*[^\(]*\(\s*([^\)]*)\)/m;
|
|
var FN_ARG_SPLIT = /,/;
|
|
var FN_ARG = /(=.+)?(\s*)$/;
|
|
var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
|
|
|
|
function parseParams(func) {
|
|
func = func.toString().replace(STRIP_COMMENTS, '');
|
|
func = func.match(FN_ARGS)[2].replace(' ', '');
|
|
func = func ? func.split(FN_ARG_SPLIT) : [];
|
|
func = func.map(function (arg){
|
|
return trim(arg.replace(FN_ARG, ''));
|
|
});
|
|
return func;
|
|
}
|
|
|
|
/**
|
|
* A dependency-injected version of the [async.auto]{@link module:ControlFlow.auto} function. Dependent
|
|
* tasks are specified as parameters to the function, after the usual callback
|
|
* parameter, with the parameter names matching the names of the tasks it
|
|
* depends on. This can provide even more readable task graphs which can be
|
|
* easier to maintain.
|
|
*
|
|
* If a final callback is specified, the task results are similarly injected,
|
|
* specified as named parameters after the initial error parameter.
|
|
*
|
|
* The autoInject function is purely syntactic sugar and its semantics are
|
|
* otherwise equivalent to [async.auto]{@link module:ControlFlow.auto}.
|
|
*
|
|
* @name autoInject
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.auto]{@link module:ControlFlow.auto}
|
|
* @category Control Flow
|
|
* @param {Object} tasks - An object, each of whose properties is an {@link AsyncFunction} of
|
|
* the form 'func([dependencies...], callback). The object's key of a property
|
|
* serves as the name of the task defined by that property, i.e. can be used
|
|
* when specifying requirements for other tasks.
|
|
* * The `callback` parameter is a `callback(err, result)` which must be called
|
|
* when finished, passing an `error` (which can be `null`) and the result of
|
|
* the function's execution. The remaining parameters name other tasks on
|
|
* which the task is dependent, and the results from those tasks are the
|
|
* arguments of those parameters.
|
|
* @param {Function} [callback] - An optional callback which is called when all
|
|
* the tasks have been completed. It receives the `err` argument if any `tasks`
|
|
* pass an error to their callback, and a `results` object with any completed
|
|
* task results, similar to `auto`.
|
|
* @example
|
|
*
|
|
* // The example from `auto` can be rewritten as follows:
|
|
* async.autoInject({
|
|
* get_data: function(callback) {
|
|
* // async code to get some data
|
|
* callback(null, 'data', 'converted to array');
|
|
* },
|
|
* make_folder: function(callback) {
|
|
* // async code to create a directory to store a file in
|
|
* // this is run at the same time as getting the data
|
|
* callback(null, 'folder');
|
|
* },
|
|
* write_file: function(get_data, make_folder, callback) {
|
|
* // once there is some data and the directory exists,
|
|
* // write the data to a file in the directory
|
|
* callback(null, 'filename');
|
|
* },
|
|
* email_link: function(write_file, callback) {
|
|
* // once the file is written let's email a link to it...
|
|
* // write_file contains the filename returned by write_file.
|
|
* callback(null, {'file':write_file, 'email':'user@example.com'});
|
|
* }
|
|
* }, function(err, results) {
|
|
* console.log('err = ', err);
|
|
* console.log('email_link = ', results.email_link);
|
|
* });
|
|
*
|
|
* // If you are using a JS minifier that mangles parameter names, `autoInject`
|
|
* // will not work with plain functions, since the parameter names will be
|
|
* // collapsed to a single letter identifier. To work around this, you can
|
|
* // explicitly specify the names of the parameters your task function needs
|
|
* // in an array, similar to Angular.js dependency injection.
|
|
*
|
|
* // This still has an advantage over plain `auto`, since the results a task
|
|
* // depends on are still spread into arguments.
|
|
* async.autoInject({
|
|
* //...
|
|
* write_file: ['get_data', 'make_folder', function(get_data, make_folder, callback) {
|
|
* callback(null, 'filename');
|
|
* }],
|
|
* email_link: ['write_file', function(write_file, callback) {
|
|
* callback(null, {'file':write_file, 'email':'user@example.com'});
|
|
* }]
|
|
* //...
|
|
* }, function(err, results) {
|
|
* console.log('err = ', err);
|
|
* console.log('email_link = ', results.email_link);
|
|
* });
|
|
*/
|
|
function autoInject(tasks, callback) {
|
|
var newTasks = {};
|
|
|
|
baseForOwn(tasks, function (taskFn, key) {
|
|
var params;
|
|
var fnIsAsync = isAsync(taskFn);
|
|
var hasNoDeps =
|
|
(!fnIsAsync && taskFn.length === 1) ||
|
|
(fnIsAsync && taskFn.length === 0);
|
|
|
|
if (isArray(taskFn)) {
|
|
params = taskFn.slice(0, -1);
|
|
taskFn = taskFn[taskFn.length - 1];
|
|
|
|
newTasks[key] = params.concat(params.length > 0 ? newTask : taskFn);
|
|
} else if (hasNoDeps) {
|
|
// no dependencies, use the function as-is
|
|
newTasks[key] = taskFn;
|
|
} else {
|
|
params = parseParams(taskFn);
|
|
if (taskFn.length === 0 && !fnIsAsync && params.length === 0) {
|
|
throw new Error("autoInject task functions require explicit parameters.");
|
|
}
|
|
|
|
// remove callback param
|
|
if (!fnIsAsync) params.pop();
|
|
|
|
newTasks[key] = params.concat(newTask);
|
|
}
|
|
|
|
function newTask(results, taskCb) {
|
|
var newArgs = arrayMap(params, function (name) {
|
|
return results[name];
|
|
});
|
|
newArgs.push(taskCb);
|
|
wrapAsync(taskFn).apply(null, newArgs);
|
|
}
|
|
});
|
|
|
|
auto(newTasks, callback);
|
|
}
|
|
|
|
// Simple doubly linked list (https://en.wikipedia.org/wiki/Doubly_linked_list) implementation
|
|
// used for queues. This implementation assumes that the node provided by the user can be modified
|
|
// to adjust the next and last properties. We implement only the minimal functionality
|
|
// for queue support.
|
|
function DLL() {
|
|
this.head = this.tail = null;
|
|
this.length = 0;
|
|
}
|
|
|
|
function setInitial(dll, node) {
|
|
dll.length = 1;
|
|
dll.head = dll.tail = node;
|
|
}
|
|
|
|
DLL.prototype.removeLink = function(node) {
|
|
if (node.prev) node.prev.next = node.next;
|
|
else this.head = node.next;
|
|
if (node.next) node.next.prev = node.prev;
|
|
else this.tail = node.prev;
|
|
|
|
node.prev = node.next = null;
|
|
this.length -= 1;
|
|
return node;
|
|
};
|
|
|
|
DLL.prototype.empty = function () {
|
|
while(this.head) this.shift();
|
|
return this;
|
|
};
|
|
|
|
DLL.prototype.insertAfter = function(node, newNode) {
|
|
newNode.prev = node;
|
|
newNode.next = node.next;
|
|
if (node.next) node.next.prev = newNode;
|
|
else this.tail = newNode;
|
|
node.next = newNode;
|
|
this.length += 1;
|
|
};
|
|
|
|
DLL.prototype.insertBefore = function(node, newNode) {
|
|
newNode.prev = node.prev;
|
|
newNode.next = node;
|
|
if (node.prev) node.prev.next = newNode;
|
|
else this.head = newNode;
|
|
node.prev = newNode;
|
|
this.length += 1;
|
|
};
|
|
|
|
DLL.prototype.unshift = function(node) {
|
|
if (this.head) this.insertBefore(this.head, node);
|
|
else setInitial(this, node);
|
|
};
|
|
|
|
DLL.prototype.push = function(node) {
|
|
if (this.tail) this.insertAfter(this.tail, node);
|
|
else setInitial(this, node);
|
|
};
|
|
|
|
DLL.prototype.shift = function() {
|
|
return this.head && this.removeLink(this.head);
|
|
};
|
|
|
|
DLL.prototype.pop = function() {
|
|
return this.tail && this.removeLink(this.tail);
|
|
};
|
|
|
|
DLL.prototype.toArray = function () {
|
|
var arr = Array(this.length);
|
|
var curr = this.head;
|
|
for(var idx = 0; idx < this.length; idx++) {
|
|
arr[idx] = curr.data;
|
|
curr = curr.next;
|
|
}
|
|
return arr;
|
|
};
|
|
|
|
DLL.prototype.remove = function (testFn) {
|
|
var curr = this.head;
|
|
while(!!curr) {
|
|
var next = curr.next;
|
|
if (testFn(curr)) {
|
|
this.removeLink(curr);
|
|
}
|
|
curr = next;
|
|
}
|
|
return this;
|
|
};
|
|
|
|
function queue(worker, concurrency, payload) {
|
|
if (concurrency == null) {
|
|
concurrency = 1;
|
|
}
|
|
else if(concurrency === 0) {
|
|
throw new Error('Concurrency must not be zero');
|
|
}
|
|
|
|
var _worker = wrapAsync(worker);
|
|
var numRunning = 0;
|
|
var workersList = [];
|
|
|
|
var processingScheduled = false;
|
|
function _insert(data, insertAtFront, callback) {
|
|
if (callback != null && typeof callback !== 'function') {
|
|
throw new Error('task callback must be a function');
|
|
}
|
|
q.started = true;
|
|
if (!isArray(data)) {
|
|
data = [data];
|
|
}
|
|
if (data.length === 0 && q.idle()) {
|
|
// call drain immediately if there are no tasks
|
|
return setImmediate$1(function() {
|
|
q.drain();
|
|
});
|
|
}
|
|
|
|
for (var i = 0, l = data.length; i < l; i++) {
|
|
var item = {
|
|
data: data[i],
|
|
callback: callback || noop
|
|
};
|
|
|
|
if (insertAtFront) {
|
|
q._tasks.unshift(item);
|
|
} else {
|
|
q._tasks.push(item);
|
|
}
|
|
}
|
|
|
|
if (!processingScheduled) {
|
|
processingScheduled = true;
|
|
setImmediate$1(function() {
|
|
processingScheduled = false;
|
|
q.process();
|
|
});
|
|
}
|
|
}
|
|
|
|
function _next(tasks) {
|
|
return function(err){
|
|
numRunning -= 1;
|
|
|
|
for (var i = 0, l = tasks.length; i < l; i++) {
|
|
var task = tasks[i];
|
|
|
|
var index = baseIndexOf(workersList, task, 0);
|
|
if (index === 0) {
|
|
workersList.shift();
|
|
} else if (index > 0) {
|
|
workersList.splice(index, 1);
|
|
}
|
|
|
|
task.callback.apply(task, arguments);
|
|
|
|
if (err != null) {
|
|
q.error(err, task.data);
|
|
}
|
|
}
|
|
|
|
if (numRunning <= (q.concurrency - q.buffer) ) {
|
|
q.unsaturated();
|
|
}
|
|
|
|
if (q.idle()) {
|
|
q.drain();
|
|
}
|
|
q.process();
|
|
};
|
|
}
|
|
|
|
var isProcessing = false;
|
|
var q = {
|
|
_tasks: new DLL(),
|
|
concurrency: concurrency,
|
|
payload: payload,
|
|
saturated: noop,
|
|
unsaturated:noop,
|
|
buffer: concurrency / 4,
|
|
empty: noop,
|
|
drain: noop,
|
|
error: noop,
|
|
started: false,
|
|
paused: false,
|
|
push: function (data, callback) {
|
|
_insert(data, false, callback);
|
|
},
|
|
kill: function () {
|
|
q.drain = noop;
|
|
q._tasks.empty();
|
|
},
|
|
unshift: function (data, callback) {
|
|
_insert(data, true, callback);
|
|
},
|
|
remove: function (testFn) {
|
|
q._tasks.remove(testFn);
|
|
},
|
|
process: function () {
|
|
// Avoid trying to start too many processing operations. This can occur
|
|
// when callbacks resolve synchronously (#1267).
|
|
if (isProcessing) {
|
|
return;
|
|
}
|
|
isProcessing = true;
|
|
while(!q.paused && numRunning < q.concurrency && q._tasks.length){
|
|
var tasks = [], data = [];
|
|
var l = q._tasks.length;
|
|
if (q.payload) l = Math.min(l, q.payload);
|
|
for (var i = 0; i < l; i++) {
|
|
var node = q._tasks.shift();
|
|
tasks.push(node);
|
|
workersList.push(node);
|
|
data.push(node.data);
|
|
}
|
|
|
|
numRunning += 1;
|
|
|
|
if (q._tasks.length === 0) {
|
|
q.empty();
|
|
}
|
|
|
|
if (numRunning === q.concurrency) {
|
|
q.saturated();
|
|
}
|
|
|
|
var cb = onlyOnce(_next(tasks));
|
|
_worker(data, cb);
|
|
}
|
|
isProcessing = false;
|
|
},
|
|
length: function () {
|
|
return q._tasks.length;
|
|
},
|
|
running: function () {
|
|
return numRunning;
|
|
},
|
|
workersList: function () {
|
|
return workersList;
|
|
},
|
|
idle: function() {
|
|
return q._tasks.length + numRunning === 0;
|
|
},
|
|
pause: function () {
|
|
q.paused = true;
|
|
},
|
|
resume: function () {
|
|
if (q.paused === false) { return; }
|
|
q.paused = false;
|
|
setImmediate$1(q.process);
|
|
}
|
|
};
|
|
return q;
|
|
}
|
|
|
|
/**
|
|
* A cargo of tasks for the worker function to complete. Cargo inherits all of
|
|
* the same methods and event callbacks as [`queue`]{@link module:ControlFlow.queue}.
|
|
* @typedef {Object} CargoObject
|
|
* @memberOf module:ControlFlow
|
|
* @property {Function} length - A function returning the number of items
|
|
* waiting to be processed. Invoke like `cargo.length()`.
|
|
* @property {number} payload - An `integer` for determining how many tasks
|
|
* should be process per round. This property can be changed after a `cargo` is
|
|
* created to alter the payload on-the-fly.
|
|
* @property {Function} push - Adds `task` to the `queue`. The callback is
|
|
* called once the `worker` has finished processing the task. Instead of a
|
|
* single task, an array of `tasks` can be submitted. The respective callback is
|
|
* used for every task in the list. Invoke like `cargo.push(task, [callback])`.
|
|
* @property {Function} saturated - A callback that is called when the
|
|
* `queue.length()` hits the concurrency and further tasks will be queued.
|
|
* @property {Function} empty - A callback that is called when the last item
|
|
* from the `queue` is given to a `worker`.
|
|
* @property {Function} drain - A callback that is called when the last item
|
|
* from the `queue` has returned from the `worker`.
|
|
* @property {Function} idle - a function returning false if there are items
|
|
* waiting or being processed, or true if not. Invoke like `cargo.idle()`.
|
|
* @property {Function} pause - a function that pauses the processing of tasks
|
|
* until `resume()` is called. Invoke like `cargo.pause()`.
|
|
* @property {Function} resume - a function that resumes the processing of
|
|
* queued tasks when the queue is paused. Invoke like `cargo.resume()`.
|
|
* @property {Function} kill - a function that removes the `drain` callback and
|
|
* empties remaining tasks from the queue forcing it to go idle. Invoke like `cargo.kill()`.
|
|
*/
|
|
|
|
/**
|
|
* Creates a `cargo` object with the specified payload. Tasks added to the
|
|
* cargo will be processed altogether (up to the `payload` limit). If the
|
|
* `worker` is in progress, the task is queued until it becomes available. Once
|
|
* the `worker` has completed some tasks, each callback of those tasks is
|
|
* called. Check out [these](https://camo.githubusercontent.com/6bbd36f4cf5b35a0f11a96dcd2e97711ffc2fb37/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130382f62626330636662302d356632392d313165322d393734662d3333393763363464633835382e676966) [animations](https://camo.githubusercontent.com/f4810e00e1c5f5f8addbe3e9f49064fd5d102699/68747470733a2f2f662e636c6f75642e6769746875622e636f6d2f6173736574732f313637363837312f36383130312f38346339323036362d356632392d313165322d383134662d3964336430323431336266642e676966)
|
|
* for how `cargo` and `queue` work.
|
|
*
|
|
* While [`queue`]{@link module:ControlFlow.queue} passes only one task to one of a group of workers
|
|
* at a time, cargo passes an array of tasks to a single worker, repeating
|
|
* when the worker is finished.
|
|
*
|
|
* @name cargo
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.queue]{@link module:ControlFlow.queue}
|
|
* @category Control Flow
|
|
* @param {AsyncFunction} worker - An asynchronous function for processing an array
|
|
* of queued tasks. Invoked with `(tasks, callback)`.
|
|
* @param {number} [payload=Infinity] - An optional `integer` for determining
|
|
* how many tasks should be processed per round; if omitted, the default is
|
|
* unlimited.
|
|
* @returns {module:ControlFlow.CargoObject} A cargo object to manage the tasks. Callbacks can
|
|
* attached as certain properties to listen for specific events during the
|
|
* lifecycle of the cargo and inner queue.
|
|
* @example
|
|
*
|
|
* // create a cargo object with payload 2
|
|
* var cargo = async.cargo(function(tasks, callback) {
|
|
* for (var i=0; i<tasks.length; i++) {
|
|
* console.log('hello ' + tasks[i].name);
|
|
* }
|
|
* callback();
|
|
* }, 2);
|
|
*
|
|
* // add some items
|
|
* cargo.push({name: 'foo'}, function(err) {
|
|
* console.log('finished processing foo');
|
|
* });
|
|
* cargo.push({name: 'bar'}, function(err) {
|
|
* console.log('finished processing bar');
|
|
* });
|
|
* cargo.push({name: 'baz'}, function(err) {
|
|
* console.log('finished processing baz');
|
|
* });
|
|
*/
|
|
function cargo(worker, payload) {
|
|
return queue(worker, 1, payload);
|
|
}
|
|
|
|
/**
|
|
* The same as [`eachOf`]{@link module:Collections.eachOf} but runs only a single async operation at a time.
|
|
*
|
|
* @name eachOfSeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.eachOf]{@link module:Collections.eachOf}
|
|
* @alias forEachOfSeries
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each item in
|
|
* `coll`.
|
|
* Invoked with (item, key, callback).
|
|
* @param {Function} [callback] - A callback which is called when all `iteratee`
|
|
* functions have finished, or an error occurs. Invoked with (err).
|
|
*/
|
|
var eachOfSeries = doLimit(eachOfLimit, 1);
|
|
|
|
/**
|
|
* Reduces `coll` into a single value using an async `iteratee` to return each
|
|
* successive step. `memo` is the initial state of the reduction. This function
|
|
* only operates in series.
|
|
*
|
|
* For performance reasons, it may make sense to split a call to this function
|
|
* into a parallel map, and then use the normal `Array.prototype.reduce` on the
|
|
* results. This function is for situations where each step in the reduction
|
|
* needs to be async; if you can get the data before reducing it, then it's
|
|
* probably a good idea to do so.
|
|
*
|
|
* @name reduce
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @alias inject
|
|
* @alias foldl
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {*} memo - The initial state of the reduction.
|
|
* @param {AsyncFunction} iteratee - A function applied to each item in the
|
|
* array to produce the next step in the reduction.
|
|
* The `iteratee` should complete with the next state of the reduction.
|
|
* If the iteratee complete with an error, the reduction is stopped and the
|
|
* main `callback` is immediately called with the error.
|
|
* Invoked with (memo, item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Result is the reduced value. Invoked with
|
|
* (err, result).
|
|
* @example
|
|
*
|
|
* async.reduce([1,2,3], 0, function(memo, item, callback) {
|
|
* // pointless async:
|
|
* process.nextTick(function() {
|
|
* callback(null, memo + item)
|
|
* });
|
|
* }, function(err, result) {
|
|
* // result is now equal to the last value of memo, which is 6
|
|
* });
|
|
*/
|
|
function reduce(coll, memo, iteratee, callback) {
|
|
callback = once(callback || noop);
|
|
var _iteratee = wrapAsync(iteratee);
|
|
eachOfSeries(coll, function(x, i, callback) {
|
|
_iteratee(memo, x, function(err, v) {
|
|
memo = v;
|
|
callback(err);
|
|
});
|
|
}, function(err) {
|
|
callback(err, memo);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Version of the compose function that is more natural to read. Each function
|
|
* consumes the return value of the previous function. It is the equivalent of
|
|
* [compose]{@link module:ControlFlow.compose} with the arguments reversed.
|
|
*
|
|
* Each function is executed with the `this` binding of the composed function.
|
|
*
|
|
* @name seq
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.compose]{@link module:ControlFlow.compose}
|
|
* @category Control Flow
|
|
* @param {...AsyncFunction} functions - the asynchronous functions to compose
|
|
* @returns {Function} a function that composes the `functions` in order
|
|
* @example
|
|
*
|
|
* // Requires lodash (or underscore), express3 and dresende's orm2.
|
|
* // Part of an app, that fetches cats of the logged user.
|
|
* // This example uses `seq` function to avoid overnesting and error
|
|
* // handling clutter.
|
|
* app.get('/cats', function(request, response) {
|
|
* var User = request.models.User;
|
|
* async.seq(
|
|
* _.bind(User.get, User), // 'User.get' has signature (id, callback(err, data))
|
|
* function(user, fn) {
|
|
* user.getCats(fn); // 'getCats' has signature (callback(err, data))
|
|
* }
|
|
* )(req.session.user_id, function (err, cats) {
|
|
* if (err) {
|
|
* console.error(err);
|
|
* response.json({ status: 'error', message: err.message });
|
|
* } else {
|
|
* response.json({ status: 'ok', message: 'Cats found', data: cats });
|
|
* }
|
|
* });
|
|
* });
|
|
*/
|
|
function seq(/*...functions*/) {
|
|
var _functions = arrayMap(arguments, wrapAsync);
|
|
return function(/*...args*/) {
|
|
var args = slice(arguments);
|
|
var that = this;
|
|
|
|
var cb = args[args.length - 1];
|
|
if (typeof cb == 'function') {
|
|
args.pop();
|
|
} else {
|
|
cb = noop;
|
|
}
|
|
|
|
reduce(_functions, args, function(newargs, fn, cb) {
|
|
fn.apply(that, newargs.concat(function(err/*, ...nextargs*/) {
|
|
var nextargs = slice(arguments, 1);
|
|
cb(err, nextargs);
|
|
}));
|
|
},
|
|
function(err, results) {
|
|
cb.apply(that, [err].concat(results));
|
|
});
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a function which is a composition of the passed asynchronous
|
|
* functions. Each function consumes the return value of the function that
|
|
* follows. Composing functions `f()`, `g()`, and `h()` would produce the result
|
|
* of `f(g(h()))`, only this version uses callbacks to obtain the return values.
|
|
*
|
|
* Each function is executed with the `this` binding of the composed function.
|
|
*
|
|
* @name compose
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {...AsyncFunction} functions - the asynchronous functions to compose
|
|
* @returns {Function} an asynchronous function that is the composed
|
|
* asynchronous `functions`
|
|
* @example
|
|
*
|
|
* function add1(n, callback) {
|
|
* setTimeout(function () {
|
|
* callback(null, n + 1);
|
|
* }, 10);
|
|
* }
|
|
*
|
|
* function mul3(n, callback) {
|
|
* setTimeout(function () {
|
|
* callback(null, n * 3);
|
|
* }, 10);
|
|
* }
|
|
*
|
|
* var add1mul3 = async.compose(mul3, add1);
|
|
* add1mul3(4, function (err, result) {
|
|
* // result now equals 15
|
|
* });
|
|
*/
|
|
var compose = function(/*...args*/) {
|
|
return seq.apply(null, slice(arguments).reverse());
|
|
};
|
|
|
|
var _concat = Array.prototype.concat;
|
|
|
|
/**
|
|
* The same as [`concat`]{@link module:Collections.concat} but runs a maximum of `limit` async operations at a time.
|
|
*
|
|
* @name concatLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.concat]{@link module:Collections.concat}
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - A function to apply to each item in `coll`,
|
|
* which should use an array as its result. Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished, or an error occurs. Results is an array
|
|
* containing the concatenated results of the `iteratee` function. Invoked with
|
|
* (err, results).
|
|
*/
|
|
var concatLimit = function(coll, limit, iteratee, callback) {
|
|
callback = callback || noop;
|
|
var _iteratee = wrapAsync(iteratee);
|
|
mapLimit(coll, limit, function(val, callback) {
|
|
_iteratee(val, function(err /*, ...args*/) {
|
|
if (err) return callback(err);
|
|
return callback(null, slice(arguments, 1));
|
|
});
|
|
}, function(err, mapResults) {
|
|
var result = [];
|
|
for (var i = 0; i < mapResults.length; i++) {
|
|
if (mapResults[i]) {
|
|
result = _concat.apply(result, mapResults[i]);
|
|
}
|
|
}
|
|
|
|
return callback(err, result);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Applies `iteratee` to each item in `coll`, concatenating the results. Returns
|
|
* the concatenated list. The `iteratee`s are called in parallel, and the
|
|
* results are concatenated as they return. There is no guarantee that the
|
|
* results array will be returned in the original order of `coll` passed to the
|
|
* `iteratee` function.
|
|
*
|
|
* @name concat
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - A function to apply to each item in `coll`,
|
|
* which should use an array as its result. Invoked with (item, callback).
|
|
* @param {Function} [callback(err)] - A callback which is called after all the
|
|
* `iteratee` functions have finished, or an error occurs. Results is an array
|
|
* containing the concatenated results of the `iteratee` function. Invoked with
|
|
* (err, results).
|
|
* @example
|
|
*
|
|
* async.concat(['dir1','dir2','dir3'], fs.readdir, function(err, files) {
|
|
* // files is now a list of filenames that exist in the 3 directories
|
|
* });
|
|
*/
|
|
var concat = doLimit(concatLimit, Infinity);
|
|
|
|
/**
|
|
* The same as [`concat`]{@link module:Collections.concat} but runs only a single async operation at a time.
|
|
*
|
|
* @name concatSeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.concat]{@link module:Collections.concat}
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - A function to apply to each item in `coll`.
|
|
* The iteratee should complete with an array an array of results.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback(err)] - A callback which is called after all the
|
|
* `iteratee` functions have finished, or an error occurs. Results is an array
|
|
* containing the concatenated results of the `iteratee` function. Invoked with
|
|
* (err, results).
|
|
*/
|
|
var concatSeries = doLimit(concatLimit, 1);
|
|
|
|
/**
|
|
* Returns a function that when called, calls-back with the values provided.
|
|
* Useful as the first function in a [`waterfall`]{@link module:ControlFlow.waterfall}, or for plugging values in to
|
|
* [`auto`]{@link module:ControlFlow.auto}.
|
|
*
|
|
* @name constant
|
|
* @static
|
|
* @memberOf module:Utils
|
|
* @method
|
|
* @category Util
|
|
* @param {...*} arguments... - Any number of arguments to automatically invoke
|
|
* callback with.
|
|
* @returns {AsyncFunction} Returns a function that when invoked, automatically
|
|
* invokes the callback with the previous given arguments.
|
|
* @example
|
|
*
|
|
* async.waterfall([
|
|
* async.constant(42),
|
|
* function (value, next) {
|
|
* // value === 42
|
|
* },
|
|
* //...
|
|
* ], callback);
|
|
*
|
|
* async.waterfall([
|
|
* async.constant(filename, "utf8"),
|
|
* fs.readFile,
|
|
* function (fileData, next) {
|
|
* //...
|
|
* }
|
|
* //...
|
|
* ], callback);
|
|
*
|
|
* async.auto({
|
|
* hostname: async.constant("https://server.net/"),
|
|
* port: findFreePort,
|
|
* launchServer: ["hostname", "port", function (options, cb) {
|
|
* startServer(options, cb);
|
|
* }],
|
|
* //...
|
|
* }, callback);
|
|
*/
|
|
var constant = function(/*...values*/) {
|
|
var values = slice(arguments);
|
|
var args = [null].concat(values);
|
|
return function (/*...ignoredArgs, callback*/) {
|
|
var callback = arguments[arguments.length - 1];
|
|
return callback.apply(this, args);
|
|
};
|
|
};
|
|
|
|
/**
|
|
* This method returns the first argument it receives.
|
|
*
|
|
* @static
|
|
* @since 0.1.0
|
|
* @memberOf _
|
|
* @category Util
|
|
* @param {*} value Any value.
|
|
* @returns {*} Returns `value`.
|
|
* @example
|
|
*
|
|
* var object = { 'a': 1 };
|
|
*
|
|
* console.log(_.identity(object) === object);
|
|
* // => true
|
|
*/
|
|
function identity(value) {
|
|
return value;
|
|
}
|
|
|
|
function _createTester(check, getResult) {
|
|
return function(eachfn, arr, iteratee, cb) {
|
|
cb = cb || noop;
|
|
var testPassed = false;
|
|
var testResult;
|
|
eachfn(arr, function(value, _, callback) {
|
|
iteratee(value, function(err, result) {
|
|
if (err) {
|
|
callback(err);
|
|
} else if (check(result) && !testResult) {
|
|
testPassed = true;
|
|
testResult = getResult(true, value);
|
|
callback(null, breakLoop);
|
|
} else {
|
|
callback();
|
|
}
|
|
});
|
|
}, function(err) {
|
|
if (err) {
|
|
cb(err);
|
|
} else {
|
|
cb(null, testPassed ? testResult : getResult(false));
|
|
}
|
|
});
|
|
};
|
|
}
|
|
|
|
function _findGetResult(v, x) {
|
|
return x;
|
|
}
|
|
|
|
/**
|
|
* Returns the first value in `coll` that passes an async truth test. The
|
|
* `iteratee` is applied in parallel, meaning the first iteratee to return
|
|
* `true` will fire the detect `callback` with that result. That means the
|
|
* result might not be the first item in the original `coll` (in terms of order)
|
|
* that passes the test.
|
|
|
|
* If order within the original `coll` is important, then look at
|
|
* [`detectSeries`]{@link module:Collections.detectSeries}.
|
|
*
|
|
* @name detect
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @alias find
|
|
* @category Collections
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
|
|
* The iteratee must complete with a boolean value as its result.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called as soon as any
|
|
* iteratee returns `true`, or after all the `iteratee` functions have finished.
|
|
* Result will be the first item in the array that passes the truth test
|
|
* (iteratee) or the value `undefined` if none passed. Invoked with
|
|
* (err, result).
|
|
* @example
|
|
*
|
|
* async.detect(['file1','file2','file3'], function(filePath, callback) {
|
|
* fs.access(filePath, function(err) {
|
|
* callback(null, !err)
|
|
* });
|
|
* }, function(err, result) {
|
|
* // result now equals the first file in the list that exists
|
|
* });
|
|
*/
|
|
var detect = doParallel(_createTester(identity, _findGetResult));
|
|
|
|
/**
|
|
* The same as [`detect`]{@link module:Collections.detect} but runs a maximum of `limit` async operations at a
|
|
* time.
|
|
*
|
|
* @name detectLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.detect]{@link module:Collections.detect}
|
|
* @alias findLimit
|
|
* @category Collections
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
|
|
* The iteratee must complete with a boolean value as its result.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called as soon as any
|
|
* iteratee returns `true`, or after all the `iteratee` functions have finished.
|
|
* Result will be the first item in the array that passes the truth test
|
|
* (iteratee) or the value `undefined` if none passed. Invoked with
|
|
* (err, result).
|
|
*/
|
|
var detectLimit = doParallelLimit(_createTester(identity, _findGetResult));
|
|
|
|
/**
|
|
* The same as [`detect`]{@link module:Collections.detect} but runs only a single async operation at a time.
|
|
*
|
|
* @name detectSeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.detect]{@link module:Collections.detect}
|
|
* @alias findSeries
|
|
* @category Collections
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - A truth test to apply to each item in `coll`.
|
|
* The iteratee must complete with a boolean value as its result.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called as soon as any
|
|
* iteratee returns `true`, or after all the `iteratee` functions have finished.
|
|
* Result will be the first item in the array that passes the truth test
|
|
* (iteratee) or the value `undefined` if none passed. Invoked with
|
|
* (err, result).
|
|
*/
|
|
var detectSeries = doLimit(detectLimit, 1);
|
|
|
|
function consoleFunc(name) {
|
|
return function (fn/*, ...args*/) {
|
|
var args = slice(arguments, 1);
|
|
args.push(function (err/*, ...args*/) {
|
|
var args = slice(arguments, 1);
|
|
if (typeof console === 'object') {
|
|
if (err) {
|
|
if (console.error) {
|
|
console.error(err);
|
|
}
|
|
} else if (console[name]) {
|
|
arrayEach(args, function (x) {
|
|
console[name](x);
|
|
});
|
|
}
|
|
}
|
|
});
|
|
wrapAsync(fn).apply(null, args);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Logs the result of an [`async` function]{@link AsyncFunction} to the
|
|
* `console` using `console.dir` to display the properties of the resulting object.
|
|
* Only works in Node.js or in browsers that support `console.dir` and
|
|
* `console.error` (such as FF and Chrome).
|
|
* If multiple arguments are returned from the async function,
|
|
* `console.dir` is called on each argument in order.
|
|
*
|
|
* @name dir
|
|
* @static
|
|
* @memberOf module:Utils
|
|
* @method
|
|
* @category Util
|
|
* @param {AsyncFunction} function - The function you want to eventually apply
|
|
* all arguments to.
|
|
* @param {...*} arguments... - Any number of arguments to apply to the function.
|
|
* @example
|
|
*
|
|
* // in a module
|
|
* var hello = function(name, callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, {hello: name});
|
|
* }, 1000);
|
|
* };
|
|
*
|
|
* // in the node repl
|
|
* node> async.dir(hello, 'world');
|
|
* {hello: 'world'}
|
|
*/
|
|
var dir = consoleFunc('dir');
|
|
|
|
/**
|
|
* The post-check version of [`during`]{@link module:ControlFlow.during}. To reflect the difference in
|
|
* the order of operations, the arguments `test` and `fn` are switched.
|
|
*
|
|
* Also a version of [`doWhilst`]{@link module:ControlFlow.doWhilst} with asynchronous `test` function.
|
|
* @name doDuring
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.during]{@link module:ControlFlow.during}
|
|
* @category Control Flow
|
|
* @param {AsyncFunction} fn - An async function which is called each time
|
|
* `test` passes. Invoked with (callback).
|
|
* @param {AsyncFunction} test - asynchronous truth test to perform before each
|
|
* execution of `fn`. Invoked with (...args, callback), where `...args` are the
|
|
* non-error args from the previous callback of `fn`.
|
|
* @param {Function} [callback] - A callback which is called after the test
|
|
* function has failed and repeated execution of `fn` has stopped. `callback`
|
|
* will be passed an error if one occurred, otherwise `null`.
|
|
*/
|
|
function doDuring(fn, test, callback) {
|
|
callback = onlyOnce(callback || noop);
|
|
var _fn = wrapAsync(fn);
|
|
var _test = wrapAsync(test);
|
|
|
|
function next(err/*, ...args*/) {
|
|
if (err) return callback(err);
|
|
var args = slice(arguments, 1);
|
|
args.push(check);
|
|
_test.apply(this, args);
|
|
}
|
|
|
|
function check(err, truth) {
|
|
if (err) return callback(err);
|
|
if (!truth) return callback(null);
|
|
_fn(next);
|
|
}
|
|
|
|
check(null, true);
|
|
|
|
}
|
|
|
|
/**
|
|
* The post-check version of [`whilst`]{@link module:ControlFlow.whilst}. To reflect the difference in
|
|
* the order of operations, the arguments `test` and `iteratee` are switched.
|
|
*
|
|
* `doWhilst` is to `whilst` as `do while` is to `while` in plain JavaScript.
|
|
*
|
|
* @name doWhilst
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.whilst]{@link module:ControlFlow.whilst}
|
|
* @category Control Flow
|
|
* @param {AsyncFunction} iteratee - A function which is called each time `test`
|
|
* passes. Invoked with (callback).
|
|
* @param {Function} test - synchronous truth test to perform after each
|
|
* execution of `iteratee`. Invoked with any non-error callback results of
|
|
* `iteratee`.
|
|
* @param {Function} [callback] - A callback which is called after the test
|
|
* function has failed and repeated execution of `iteratee` has stopped.
|
|
* `callback` will be passed an error and any arguments passed to the final
|
|
* `iteratee`'s callback. Invoked with (err, [results]);
|
|
*/
|
|
function doWhilst(iteratee, test, callback) {
|
|
callback = onlyOnce(callback || noop);
|
|
var _iteratee = wrapAsync(iteratee);
|
|
var next = function(err/*, ...args*/) {
|
|
if (err) return callback(err);
|
|
var args = slice(arguments, 1);
|
|
if (test.apply(this, args)) return _iteratee(next);
|
|
callback.apply(null, [null].concat(args));
|
|
};
|
|
_iteratee(next);
|
|
}
|
|
|
|
/**
|
|
* Like ['doWhilst']{@link module:ControlFlow.doWhilst}, except the `test` is inverted. Note the
|
|
* argument ordering differs from `until`.
|
|
*
|
|
* @name doUntil
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.doWhilst]{@link module:ControlFlow.doWhilst}
|
|
* @category Control Flow
|
|
* @param {AsyncFunction} iteratee - An async function which is called each time
|
|
* `test` fails. Invoked with (callback).
|
|
* @param {Function} test - synchronous truth test to perform after each
|
|
* execution of `iteratee`. Invoked with any non-error callback results of
|
|
* `iteratee`.
|
|
* @param {Function} [callback] - A callback which is called after the test
|
|
* function has passed and repeated execution of `iteratee` has stopped. `callback`
|
|
* will be passed an error and any arguments passed to the final `iteratee`'s
|
|
* callback. Invoked with (err, [results]);
|
|
*/
|
|
function doUntil(iteratee, test, callback) {
|
|
doWhilst(iteratee, function() {
|
|
return !test.apply(this, arguments);
|
|
}, callback);
|
|
}
|
|
|
|
/**
|
|
* Like [`whilst`]{@link module:ControlFlow.whilst}, except the `test` is an asynchronous function that
|
|
* is passed a callback in the form of `function (err, truth)`. If error is
|
|
* passed to `test` or `fn`, the main callback is immediately called with the
|
|
* value of the error.
|
|
*
|
|
* @name during
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.whilst]{@link module:ControlFlow.whilst}
|
|
* @category Control Flow
|
|
* @param {AsyncFunction} test - asynchronous truth test to perform before each
|
|
* execution of `fn`. Invoked with (callback).
|
|
* @param {AsyncFunction} fn - An async function which is called each time
|
|
* `test` passes. Invoked with (callback).
|
|
* @param {Function} [callback] - A callback which is called after the test
|
|
* function has failed and repeated execution of `fn` has stopped. `callback`
|
|
* will be passed an error, if one occurred, otherwise `null`.
|
|
* @example
|
|
*
|
|
* var count = 0;
|
|
*
|
|
* async.during(
|
|
* function (callback) {
|
|
* return callback(null, count < 5);
|
|
* },
|
|
* function (callback) {
|
|
* count++;
|
|
* setTimeout(callback, 1000);
|
|
* },
|
|
* function (err) {
|
|
* // 5 seconds have passed
|
|
* }
|
|
* );
|
|
*/
|
|
function during(test, fn, callback) {
|
|
callback = onlyOnce(callback || noop);
|
|
var _fn = wrapAsync(fn);
|
|
var _test = wrapAsync(test);
|
|
|
|
function next(err) {
|
|
if (err) return callback(err);
|
|
_test(check);
|
|
}
|
|
|
|
function check(err, truth) {
|
|
if (err) return callback(err);
|
|
if (!truth) return callback(null);
|
|
_fn(next);
|
|
}
|
|
|
|
_test(check);
|
|
}
|
|
|
|
function _withoutIndex(iteratee) {
|
|
return function (value, index, callback) {
|
|
return iteratee(value, callback);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Applies the function `iteratee` to each item in `coll`, in parallel.
|
|
* The `iteratee` is called with an item from the list, and a callback for when
|
|
* it has finished. If the `iteratee` passes an error to its `callback`, the
|
|
* main `callback` (for the `each` function) is immediately called with the
|
|
* error.
|
|
*
|
|
* Note, that since this function applies `iteratee` to each item in parallel,
|
|
* there is no guarantee that the iteratee functions will complete in order.
|
|
*
|
|
* @name each
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @alias forEach
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to
|
|
* each item in `coll`. Invoked with (item, callback).
|
|
* The array index is not passed to the iteratee.
|
|
* If you need the index, use `eachOf`.
|
|
* @param {Function} [callback] - A callback which is called when all
|
|
* `iteratee` functions have finished, or an error occurs. Invoked with (err).
|
|
* @example
|
|
*
|
|
* // assuming openFiles is an array of file names and saveFile is a function
|
|
* // to save the modified contents of that file:
|
|
*
|
|
* async.each(openFiles, saveFile, function(err){
|
|
* // if any of the saves produced an error, err would equal that error
|
|
* });
|
|
*
|
|
* // assuming openFiles is an array of file names
|
|
* async.each(openFiles, function(file, callback) {
|
|
*
|
|
* // Perform operation on file here.
|
|
* console.log('Processing file ' + file);
|
|
*
|
|
* if( file.length > 32 ) {
|
|
* console.log('This file name is too long');
|
|
* callback('File name too long');
|
|
* } else {
|
|
* // Do work to process file here
|
|
* console.log('File processed');
|
|
* callback();
|
|
* }
|
|
* }, function(err) {
|
|
* // if any of the file processing produced an error, err would equal that error
|
|
* if( err ) {
|
|
* // One of the iterations produced an error.
|
|
* // All processing will now stop.
|
|
* console.log('A file failed to process');
|
|
* } else {
|
|
* console.log('All files have been processed successfully');
|
|
* }
|
|
* });
|
|
*/
|
|
function eachLimit(coll, iteratee, callback) {
|
|
eachOf(coll, _withoutIndex(wrapAsync(iteratee)), callback);
|
|
}
|
|
|
|
/**
|
|
* The same as [`each`]{@link module:Collections.each} but runs a maximum of `limit` async operations at a time.
|
|
*
|
|
* @name eachLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.each]{@link module:Collections.each}
|
|
* @alias forEachLimit
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each item in
|
|
* `coll`.
|
|
* The array index is not passed to the iteratee.
|
|
* If you need the index, use `eachOfLimit`.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called when all
|
|
* `iteratee` functions have finished, or an error occurs. Invoked with (err).
|
|
*/
|
|
function eachLimit$1(coll, limit, iteratee, callback) {
|
|
_eachOfLimit(limit)(coll, _withoutIndex(wrapAsync(iteratee)), callback);
|
|
}
|
|
|
|
/**
|
|
* The same as [`each`]{@link module:Collections.each} but runs only a single async operation at a time.
|
|
*
|
|
* @name eachSeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.each]{@link module:Collections.each}
|
|
* @alias forEachSeries
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each
|
|
* item in `coll`.
|
|
* The array index is not passed to the iteratee.
|
|
* If you need the index, use `eachOfSeries`.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called when all
|
|
* `iteratee` functions have finished, or an error occurs. Invoked with (err).
|
|
*/
|
|
var eachSeries = doLimit(eachLimit$1, 1);
|
|
|
|
/**
|
|
* Wrap an async function and ensure it calls its callback on a later tick of
|
|
* the event loop. If the function already calls its callback on a next tick,
|
|
* no extra deferral is added. This is useful for preventing stack overflows
|
|
* (`RangeError: Maximum call stack size exceeded`) and generally keeping
|
|
* [Zalgo](http://blog.izs.me/post/59142742143/designing-apis-for-asynchrony)
|
|
* contained. ES2017 `async` functions are returned as-is -- they are immune
|
|
* to Zalgo's corrupting influences, as they always resolve on a later tick.
|
|
*
|
|
* @name ensureAsync
|
|
* @static
|
|
* @memberOf module:Utils
|
|
* @method
|
|
* @category Util
|
|
* @param {AsyncFunction} fn - an async function, one that expects a node-style
|
|
* callback as its last argument.
|
|
* @returns {AsyncFunction} Returns a wrapped function with the exact same call
|
|
* signature as the function passed in.
|
|
* @example
|
|
*
|
|
* function sometimesAsync(arg, callback) {
|
|
* if (cache[arg]) {
|
|
* return callback(null, cache[arg]); // this would be synchronous!!
|
|
* } else {
|
|
* doSomeIO(arg, callback); // this IO would be asynchronous
|
|
* }
|
|
* }
|
|
*
|
|
* // this has a risk of stack overflows if many results are cached in a row
|
|
* async.mapSeries(args, sometimesAsync, done);
|
|
*
|
|
* // this will defer sometimesAsync's callback if necessary,
|
|
* // preventing stack overflows
|
|
* async.mapSeries(args, async.ensureAsync(sometimesAsync), done);
|
|
*/
|
|
function ensureAsync(fn) {
|
|
if (isAsync(fn)) return fn;
|
|
return initialParams(function (args, callback) {
|
|
var sync = true;
|
|
args.push(function () {
|
|
var innerArgs = arguments;
|
|
if (sync) {
|
|
setImmediate$1(function () {
|
|
callback.apply(null, innerArgs);
|
|
});
|
|
} else {
|
|
callback.apply(null, innerArgs);
|
|
}
|
|
});
|
|
fn.apply(this, args);
|
|
sync = false;
|
|
});
|
|
}
|
|
|
|
function notId(v) {
|
|
return !v;
|
|
}
|
|
|
|
/**
|
|
* Returns `true` if every element in `coll` satisfies an async test. If any
|
|
* iteratee call returns `false`, the main `callback` is immediately called.
|
|
*
|
|
* @name every
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @alias all
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async truth test to apply to each item
|
|
* in the collection in parallel.
|
|
* The iteratee must complete with a boolean result value.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Result will be either `true` or `false`
|
|
* depending on the values of the async tests. Invoked with (err, result).
|
|
* @example
|
|
*
|
|
* async.every(['file1','file2','file3'], function(filePath, callback) {
|
|
* fs.access(filePath, function(err) {
|
|
* callback(null, !err)
|
|
* });
|
|
* }, function(err, result) {
|
|
* // if result is true then every file exists
|
|
* });
|
|
*/
|
|
var every = doParallel(_createTester(notId, notId));
|
|
|
|
/**
|
|
* The same as [`every`]{@link module:Collections.every} but runs a maximum of `limit` async operations at a time.
|
|
*
|
|
* @name everyLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.every]{@link module:Collections.every}
|
|
* @alias allLimit
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - An async truth test to apply to each item
|
|
* in the collection in parallel.
|
|
* The iteratee must complete with a boolean result value.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Result will be either `true` or `false`
|
|
* depending on the values of the async tests. Invoked with (err, result).
|
|
*/
|
|
var everyLimit = doParallelLimit(_createTester(notId, notId));
|
|
|
|
/**
|
|
* The same as [`every`]{@link module:Collections.every} but runs only a single async operation at a time.
|
|
*
|
|
* @name everySeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.every]{@link module:Collections.every}
|
|
* @alias allSeries
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async truth test to apply to each item
|
|
* in the collection in series.
|
|
* The iteratee must complete with a boolean result value.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Result will be either `true` or `false`
|
|
* depending on the values of the async tests. Invoked with (err, result).
|
|
*/
|
|
var everySeries = doLimit(everyLimit, 1);
|
|
|
|
/**
|
|
* The base implementation of `_.property` without support for deep paths.
|
|
*
|
|
* @private
|
|
* @param {string} key The key of the property to get.
|
|
* @returns {Function} Returns the new accessor function.
|
|
*/
|
|
function baseProperty(key) {
|
|
return function(object) {
|
|
return object == null ? undefined : object[key];
|
|
};
|
|
}
|
|
|
|
function filterArray(eachfn, arr, iteratee, callback) {
|
|
var truthValues = new Array(arr.length);
|
|
eachfn(arr, function (x, index, callback) {
|
|
iteratee(x, function (err, v) {
|
|
truthValues[index] = !!v;
|
|
callback(err);
|
|
});
|
|
}, function (err) {
|
|
if (err) return callback(err);
|
|
var results = [];
|
|
for (var i = 0; i < arr.length; i++) {
|
|
if (truthValues[i]) results.push(arr[i]);
|
|
}
|
|
callback(null, results);
|
|
});
|
|
}
|
|
|
|
function filterGeneric(eachfn, coll, iteratee, callback) {
|
|
var results = [];
|
|
eachfn(coll, function (x, index, callback) {
|
|
iteratee(x, function (err, v) {
|
|
if (err) {
|
|
callback(err);
|
|
} else {
|
|
if (v) {
|
|
results.push({index: index, value: x});
|
|
}
|
|
callback();
|
|
}
|
|
});
|
|
}, function (err) {
|
|
if (err) {
|
|
callback(err);
|
|
} else {
|
|
callback(null, arrayMap(results.sort(function (a, b) {
|
|
return a.index - b.index;
|
|
}), baseProperty('value')));
|
|
}
|
|
});
|
|
}
|
|
|
|
function _filter(eachfn, coll, iteratee, callback) {
|
|
var filter = isArrayLike(coll) ? filterArray : filterGeneric;
|
|
filter(eachfn, coll, wrapAsync(iteratee), callback || noop);
|
|
}
|
|
|
|
/**
|
|
* Returns a new array of all the values in `coll` which pass an async truth
|
|
* test. This operation is performed in parallel, but the results array will be
|
|
* in the same order as the original.
|
|
*
|
|
* @name filter
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @alias select
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
|
|
* The `iteratee` is passed a `callback(err, truthValue)`, which must be called
|
|
* with a boolean argument once it has completed. Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Invoked with (err, results).
|
|
* @example
|
|
*
|
|
* async.filter(['file1','file2','file3'], function(filePath, callback) {
|
|
* fs.access(filePath, function(err) {
|
|
* callback(null, !err)
|
|
* });
|
|
* }, function(err, results) {
|
|
* // results now equals an array of the existing files
|
|
* });
|
|
*/
|
|
var filter = doParallel(_filter);
|
|
|
|
/**
|
|
* The same as [`filter`]{@link module:Collections.filter} but runs a maximum of `limit` async operations at a
|
|
* time.
|
|
*
|
|
* @name filterLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.filter]{@link module:Collections.filter}
|
|
* @alias selectLimit
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
|
|
* The `iteratee` is passed a `callback(err, truthValue)`, which must be called
|
|
* with a boolean argument once it has completed. Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Invoked with (err, results).
|
|
*/
|
|
var filterLimit = doParallelLimit(_filter);
|
|
|
|
/**
|
|
* The same as [`filter`]{@link module:Collections.filter} but runs only a single async operation at a time.
|
|
*
|
|
* @name filterSeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.filter]{@link module:Collections.filter}
|
|
* @alias selectSeries
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {Function} iteratee - A truth test to apply to each item in `coll`.
|
|
* The `iteratee` is passed a `callback(err, truthValue)`, which must be called
|
|
* with a boolean argument once it has completed. Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Invoked with (err, results)
|
|
*/
|
|
var filterSeries = doLimit(filterLimit, 1);
|
|
|
|
/**
|
|
* Calls the asynchronous function `fn` with a callback parameter that allows it
|
|
* to call itself again, in series, indefinitely.
|
|
|
|
* If an error is passed to the callback then `errback` is called with the
|
|
* error, and execution stops, otherwise it will never be called.
|
|
*
|
|
* @name forever
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {AsyncFunction} fn - an async function to call repeatedly.
|
|
* Invoked with (next).
|
|
* @param {Function} [errback] - when `fn` passes an error to it's callback,
|
|
* this function will be called, and execution stops. Invoked with (err).
|
|
* @example
|
|
*
|
|
* async.forever(
|
|
* function(next) {
|
|
* // next is suitable for passing to things that need a callback(err [, whatever]);
|
|
* // it will result in this function being called again.
|
|
* },
|
|
* function(err) {
|
|
* // if next is called with a value in its first parameter, it will appear
|
|
* // in here as 'err', and execution will stop.
|
|
* }
|
|
* );
|
|
*/
|
|
function forever(fn, errback) {
|
|
var done = onlyOnce(errback || noop);
|
|
var task = wrapAsync(ensureAsync(fn));
|
|
|
|
function next(err) {
|
|
if (err) return done(err);
|
|
task(next);
|
|
}
|
|
next();
|
|
}
|
|
|
|
/**
|
|
* The same as [`groupBy`]{@link module:Collections.groupBy} but runs a maximum of `limit` async operations at a time.
|
|
*
|
|
* @name groupByLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.groupBy]{@link module:Collections.groupBy}
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each item in
|
|
* `coll`.
|
|
* The iteratee should complete with a `key` to group the value under.
|
|
* Invoked with (value, callback).
|
|
* @param {Function} [callback] - A callback which is called when all `iteratee`
|
|
* functions have finished, or an error occurs. Result is an `Object` whoses
|
|
* properties are arrays of values which returned the corresponding key.
|
|
*/
|
|
var groupByLimit = function(coll, limit, iteratee, callback) {
|
|
callback = callback || noop;
|
|
var _iteratee = wrapAsync(iteratee);
|
|
mapLimit(coll, limit, function(val, callback) {
|
|
_iteratee(val, function(err, key) {
|
|
if (err) return callback(err);
|
|
return callback(null, {key: key, val: val});
|
|
});
|
|
}, function(err, mapResults) {
|
|
var result = {};
|
|
// from MDN, handle object having an `hasOwnProperty` prop
|
|
var hasOwnProperty = Object.prototype.hasOwnProperty;
|
|
|
|
for (var i = 0; i < mapResults.length; i++) {
|
|
if (mapResults[i]) {
|
|
var key = mapResults[i].key;
|
|
var val = mapResults[i].val;
|
|
|
|
if (hasOwnProperty.call(result, key)) {
|
|
result[key].push(val);
|
|
} else {
|
|
result[key] = [val];
|
|
}
|
|
}
|
|
}
|
|
|
|
return callback(err, result);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Returns a new object, where each value corresponds to an array of items, from
|
|
* `coll`, that returned the corresponding key. That is, the keys of the object
|
|
* correspond to the values passed to the `iteratee` callback.
|
|
*
|
|
* Note: Since this function applies the `iteratee` to each item in parallel,
|
|
* there is no guarantee that the `iteratee` functions will complete in order.
|
|
* However, the values for each key in the `result` will be in the same order as
|
|
* the original `coll`. For Objects, the values will roughly be in the order of
|
|
* the original Objects' keys (but this can vary across JavaScript engines).
|
|
*
|
|
* @name groupBy
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each item in
|
|
* `coll`.
|
|
* The iteratee should complete with a `key` to group the value under.
|
|
* Invoked with (value, callback).
|
|
* @param {Function} [callback] - A callback which is called when all `iteratee`
|
|
* functions have finished, or an error occurs. Result is an `Object` whoses
|
|
* properties are arrays of values which returned the corresponding key.
|
|
* @example
|
|
*
|
|
* async.groupBy(['userId1', 'userId2', 'userId3'], function(userId, callback) {
|
|
* db.findById(userId, function(err, user) {
|
|
* if (err) return callback(err);
|
|
* return callback(null, user.age);
|
|
* });
|
|
* }, function(err, result) {
|
|
* // result is object containing the userIds grouped by age
|
|
* // e.g. { 30: ['userId1', 'userId3'], 42: ['userId2']};
|
|
* });
|
|
*/
|
|
var groupBy = doLimit(groupByLimit, Infinity);
|
|
|
|
/**
|
|
* The same as [`groupBy`]{@link module:Collections.groupBy} but runs only a single async operation at a time.
|
|
*
|
|
* @name groupBySeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.groupBy]{@link module:Collections.groupBy}
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each item in
|
|
* `coll`.
|
|
* The iteratee should complete with a `key` to group the value under.
|
|
* Invoked with (value, callback).
|
|
* @param {Function} [callback] - A callback which is called when all `iteratee`
|
|
* functions have finished, or an error occurs. Result is an `Object` whoses
|
|
* properties are arrays of values which returned the corresponding key.
|
|
*/
|
|
var groupBySeries = doLimit(groupByLimit, 1);
|
|
|
|
/**
|
|
* Logs the result of an `async` function to the `console`. Only works in
|
|
* Node.js or in browsers that support `console.log` and `console.error` (such
|
|
* as FF and Chrome). If multiple arguments are returned from the async
|
|
* function, `console.log` is called on each argument in order.
|
|
*
|
|
* @name log
|
|
* @static
|
|
* @memberOf module:Utils
|
|
* @method
|
|
* @category Util
|
|
* @param {AsyncFunction} function - The function you want to eventually apply
|
|
* all arguments to.
|
|
* @param {...*} arguments... - Any number of arguments to apply to the function.
|
|
* @example
|
|
*
|
|
* // in a module
|
|
* var hello = function(name, callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'hello ' + name);
|
|
* }, 1000);
|
|
* };
|
|
*
|
|
* // in the node repl
|
|
* node> async.log(hello, 'world');
|
|
* 'hello world'
|
|
*/
|
|
var log = consoleFunc('log');
|
|
|
|
/**
|
|
* The same as [`mapValues`]{@link module:Collections.mapValues} but runs a maximum of `limit` async operations at a
|
|
* time.
|
|
*
|
|
* @name mapValuesLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.mapValues]{@link module:Collections.mapValues}
|
|
* @category Collection
|
|
* @param {Object} obj - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - A function to apply to each value and key
|
|
* in `coll`.
|
|
* The iteratee should complete with the transformed value as its result.
|
|
* Invoked with (value, key, callback).
|
|
* @param {Function} [callback] - A callback which is called when all `iteratee`
|
|
* functions have finished, or an error occurs. `result` is a new object consisting
|
|
* of each key from `obj`, with each transformed value on the right-hand side.
|
|
* Invoked with (err, result).
|
|
*/
|
|
function mapValuesLimit(obj, limit, iteratee, callback) {
|
|
callback = once(callback || noop);
|
|
var newObj = {};
|
|
var _iteratee = wrapAsync(iteratee);
|
|
eachOfLimit(obj, limit, function(val, key, next) {
|
|
_iteratee(val, key, function (err, result) {
|
|
if (err) return next(err);
|
|
newObj[key] = result;
|
|
next();
|
|
});
|
|
}, function (err) {
|
|
callback(err, newObj);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* A relative of [`map`]{@link module:Collections.map}, designed for use with objects.
|
|
*
|
|
* Produces a new Object by mapping each value of `obj` through the `iteratee`
|
|
* function. The `iteratee` is called each `value` and `key` from `obj` and a
|
|
* callback for when it has finished processing. Each of these callbacks takes
|
|
* two arguments: an `error`, and the transformed item from `obj`. If `iteratee`
|
|
* passes an error to its callback, the main `callback` (for the `mapValues`
|
|
* function) is immediately called with the error.
|
|
*
|
|
* Note, the order of the keys in the result is not guaranteed. The keys will
|
|
* be roughly in the order they complete, (but this is very engine-specific)
|
|
*
|
|
* @name mapValues
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @category Collection
|
|
* @param {Object} obj - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - A function to apply to each value and key
|
|
* in `coll`.
|
|
* The iteratee should complete with the transformed value as its result.
|
|
* Invoked with (value, key, callback).
|
|
* @param {Function} [callback] - A callback which is called when all `iteratee`
|
|
* functions have finished, or an error occurs. `result` is a new object consisting
|
|
* of each key from `obj`, with each transformed value on the right-hand side.
|
|
* Invoked with (err, result).
|
|
* @example
|
|
*
|
|
* async.mapValues({
|
|
* f1: 'file1',
|
|
* f2: 'file2',
|
|
* f3: 'file3'
|
|
* }, function (file, key, callback) {
|
|
* fs.stat(file, callback);
|
|
* }, function(err, result) {
|
|
* // result is now a map of stats for each file, e.g.
|
|
* // {
|
|
* // f1: [stats for file1],
|
|
* // f2: [stats for file2],
|
|
* // f3: [stats for file3]
|
|
* // }
|
|
* });
|
|
*/
|
|
|
|
var mapValues = doLimit(mapValuesLimit, Infinity);
|
|
|
|
/**
|
|
* The same as [`mapValues`]{@link module:Collections.mapValues} but runs only a single async operation at a time.
|
|
*
|
|
* @name mapValuesSeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.mapValues]{@link module:Collections.mapValues}
|
|
* @category Collection
|
|
* @param {Object} obj - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - A function to apply to each value and key
|
|
* in `coll`.
|
|
* The iteratee should complete with the transformed value as its result.
|
|
* Invoked with (value, key, callback).
|
|
* @param {Function} [callback] - A callback which is called when all `iteratee`
|
|
* functions have finished, or an error occurs. `result` is a new object consisting
|
|
* of each key from `obj`, with each transformed value on the right-hand side.
|
|
* Invoked with (err, result).
|
|
*/
|
|
var mapValuesSeries = doLimit(mapValuesLimit, 1);
|
|
|
|
function has(obj, key) {
|
|
return key in obj;
|
|
}
|
|
|
|
/**
|
|
* Caches the results of an async function. When creating a hash to store
|
|
* function results against, the callback is omitted from the hash and an
|
|
* optional hash function can be used.
|
|
*
|
|
* If no hash function is specified, the first argument is used as a hash key,
|
|
* which may work reasonably if it is a string or a data type that converts to a
|
|
* distinct string. Note that objects and arrays will not behave reasonably.
|
|
* Neither will cases where the other arguments are significant. In such cases,
|
|
* specify your own hash function.
|
|
*
|
|
* The cache of results is exposed as the `memo` property of the function
|
|
* returned by `memoize`.
|
|
*
|
|
* @name memoize
|
|
* @static
|
|
* @memberOf module:Utils
|
|
* @method
|
|
* @category Util
|
|
* @param {AsyncFunction} fn - The async function to proxy and cache results from.
|
|
* @param {Function} hasher - An optional function for generating a custom hash
|
|
* for storing results. It has all the arguments applied to it apart from the
|
|
* callback, and must be synchronous.
|
|
* @returns {AsyncFunction} a memoized version of `fn`
|
|
* @example
|
|
*
|
|
* var slow_fn = function(name, callback) {
|
|
* // do something
|
|
* callback(null, result);
|
|
* };
|
|
* var fn = async.memoize(slow_fn);
|
|
*
|
|
* // fn can now be used as if it were slow_fn
|
|
* fn('some name', function() {
|
|
* // callback
|
|
* });
|
|
*/
|
|
function memoize(fn, hasher) {
|
|
var memo = Object.create(null);
|
|
var queues = Object.create(null);
|
|
hasher = hasher || identity;
|
|
var _fn = wrapAsync(fn);
|
|
var memoized = initialParams(function memoized(args, callback) {
|
|
var key = hasher.apply(null, args);
|
|
if (has(memo, key)) {
|
|
setImmediate$1(function() {
|
|
callback.apply(null, memo[key]);
|
|
});
|
|
} else if (has(queues, key)) {
|
|
queues[key].push(callback);
|
|
} else {
|
|
queues[key] = [callback];
|
|
_fn.apply(null, args.concat(function(/*args*/) {
|
|
var args = slice(arguments);
|
|
memo[key] = args;
|
|
var q = queues[key];
|
|
delete queues[key];
|
|
for (var i = 0, l = q.length; i < l; i++) {
|
|
q[i].apply(null, args);
|
|
}
|
|
}));
|
|
}
|
|
});
|
|
memoized.memo = memo;
|
|
memoized.unmemoized = fn;
|
|
return memoized;
|
|
}
|
|
|
|
/**
|
|
* Calls `callback` on a later loop around the event loop. In Node.js this just
|
|
* calls `process.nextTick`. In the browser it will use `setImmediate` if
|
|
* available, otherwise `setTimeout(callback, 0)`, which means other higher
|
|
* priority events may precede the execution of `callback`.
|
|
*
|
|
* This is used internally for browser-compatibility purposes.
|
|
*
|
|
* @name nextTick
|
|
* @static
|
|
* @memberOf module:Utils
|
|
* @method
|
|
* @see [async.setImmediate]{@link module:Utils.setImmediate}
|
|
* @category Util
|
|
* @param {Function} callback - The function to call on a later loop around
|
|
* the event loop. Invoked with (args...).
|
|
* @param {...*} args... - any number of additional arguments to pass to the
|
|
* callback on the next tick.
|
|
* @example
|
|
*
|
|
* var call_order = [];
|
|
* async.nextTick(function() {
|
|
* call_order.push('two');
|
|
* // call_order now equals ['one','two']
|
|
* });
|
|
* call_order.push('one');
|
|
*
|
|
* async.setImmediate(function (a, b, c) {
|
|
* // a, b, and c equal 1, 2, and 3
|
|
* }, 1, 2, 3);
|
|
*/
|
|
var _defer$1;
|
|
|
|
if (hasNextTick) {
|
|
_defer$1 = process.nextTick;
|
|
} else if (hasSetImmediate) {
|
|
_defer$1 = setImmediate;
|
|
} else {
|
|
_defer$1 = fallback;
|
|
}
|
|
|
|
var nextTick = wrap(_defer$1);
|
|
|
|
function _parallel(eachfn, tasks, callback) {
|
|
callback = callback || noop;
|
|
var results = isArrayLike(tasks) ? [] : {};
|
|
|
|
eachfn(tasks, function (task, key, callback) {
|
|
wrapAsync(task)(function (err, result) {
|
|
if (arguments.length > 2) {
|
|
result = slice(arguments, 1);
|
|
}
|
|
results[key] = result;
|
|
callback(err);
|
|
});
|
|
}, function (err) {
|
|
callback(err, results);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Run the `tasks` collection of functions in parallel, without waiting until
|
|
* the previous function has completed. If any of the functions pass an error to
|
|
* its callback, the main `callback` is immediately called with the value of the
|
|
* error. Once the `tasks` have completed, the results are passed to the final
|
|
* `callback` as an array.
|
|
*
|
|
* **Note:** `parallel` is about kicking-off I/O tasks in parallel, not about
|
|
* parallel execution of code. If your tasks do not use any timers or perform
|
|
* any I/O, they will actually be executed in series. Any synchronous setup
|
|
* sections for each task will happen one after the other. JavaScript remains
|
|
* single-threaded.
|
|
*
|
|
* **Hint:** Use [`reflect`]{@link module:Utils.reflect} to continue the
|
|
* execution of other tasks when a task fails.
|
|
*
|
|
* It is also possible to use an object instead of an array. Each property will
|
|
* be run as a function and the results will be passed to the final `callback`
|
|
* as an object instead of an array. This can be a more readable way of handling
|
|
* results from {@link async.parallel}.
|
|
*
|
|
* @name parallel
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {Array|Iterable|Object} tasks - A collection of
|
|
* [async functions]{@link AsyncFunction} to run.
|
|
* Each async function can complete with any number of optional `result` values.
|
|
* @param {Function} [callback] - An optional callback to run once all the
|
|
* functions have completed successfully. This function gets a results array
|
|
* (or object) containing all the result arguments passed to the task callbacks.
|
|
* Invoked with (err, results).
|
|
*
|
|
* @example
|
|
* async.parallel([
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'one');
|
|
* }, 200);
|
|
* },
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'two');
|
|
* }, 100);
|
|
* }
|
|
* ],
|
|
* // optional callback
|
|
* function(err, results) {
|
|
* // the results array will equal ['one','two'] even though
|
|
* // the second function had a shorter timeout.
|
|
* });
|
|
*
|
|
* // an example using an object instead of an array
|
|
* async.parallel({
|
|
* one: function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 1);
|
|
* }, 200);
|
|
* },
|
|
* two: function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 2);
|
|
* }, 100);
|
|
* }
|
|
* }, function(err, results) {
|
|
* // results is now equals to: {one: 1, two: 2}
|
|
* });
|
|
*/
|
|
function parallelLimit(tasks, callback) {
|
|
_parallel(eachOf, tasks, callback);
|
|
}
|
|
|
|
/**
|
|
* The same as [`parallel`]{@link module:ControlFlow.parallel} but runs a maximum of `limit` async operations at a
|
|
* time.
|
|
*
|
|
* @name parallelLimit
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.parallel]{@link module:ControlFlow.parallel}
|
|
* @category Control Flow
|
|
* @param {Array|Iterable|Object} tasks - A collection of
|
|
* [async functions]{@link AsyncFunction} to run.
|
|
* Each async function can complete with any number of optional `result` values.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {Function} [callback] - An optional callback to run once all the
|
|
* functions have completed successfully. This function gets a results array
|
|
* (or object) containing all the result arguments passed to the task callbacks.
|
|
* Invoked with (err, results).
|
|
*/
|
|
function parallelLimit$1(tasks, limit, callback) {
|
|
_parallel(_eachOfLimit(limit), tasks, callback);
|
|
}
|
|
|
|
/**
|
|
* A queue of tasks for the worker function to complete.
|
|
* @typedef {Object} QueueObject
|
|
* @memberOf module:ControlFlow
|
|
* @property {Function} length - a function returning the number of items
|
|
* waiting to be processed. Invoke with `queue.length()`.
|
|
* @property {boolean} started - a boolean indicating whether or not any
|
|
* items have been pushed and processed by the queue.
|
|
* @property {Function} running - a function returning the number of items
|
|
* currently being processed. Invoke with `queue.running()`.
|
|
* @property {Function} workersList - a function returning the array of items
|
|
* currently being processed. Invoke with `queue.workersList()`.
|
|
* @property {Function} idle - a function returning false if there are items
|
|
* waiting or being processed, or true if not. Invoke with `queue.idle()`.
|
|
* @property {number} concurrency - an integer for determining how many `worker`
|
|
* functions should be run in parallel. This property can be changed after a
|
|
* `queue` is created to alter the concurrency on-the-fly.
|
|
* @property {Function} push - add a new task to the `queue`. Calls `callback`
|
|
* once the `worker` has finished processing the task. Instead of a single task,
|
|
* a `tasks` array can be submitted. The respective callback is used for every
|
|
* task in the list. Invoke with `queue.push(task, [callback])`,
|
|
* @property {Function} unshift - add a new task to the front of the `queue`.
|
|
* Invoke with `queue.unshift(task, [callback])`.
|
|
* @property {Function} remove - remove items from the queue that match a test
|
|
* function. The test function will be passed an object with a `data` property,
|
|
* and a `priority` property, if this is a
|
|
* [priorityQueue]{@link module:ControlFlow.priorityQueue} object.
|
|
* Invoked with `queue.remove(testFn)`, where `testFn` is of the form
|
|
* `function ({data, priority}) {}` and returns a Boolean.
|
|
* @property {Function} saturated - a callback that is called when the number of
|
|
* running workers hits the `concurrency` limit, and further tasks will be
|
|
* queued.
|
|
* @property {Function} unsaturated - a callback that is called when the number
|
|
* of running workers is less than the `concurrency` & `buffer` limits, and
|
|
* further tasks will not be queued.
|
|
* @property {number} buffer - A minimum threshold buffer in order to say that
|
|
* the `queue` is `unsaturated`.
|
|
* @property {Function} empty - a callback that is called when the last item
|
|
* from the `queue` is given to a `worker`.
|
|
* @property {Function} drain - a callback that is called when the last item
|
|
* from the `queue` has returned from the `worker`.
|
|
* @property {Function} error - a callback that is called when a task errors.
|
|
* Has the signature `function(error, task)`.
|
|
* @property {boolean} paused - a boolean for determining whether the queue is
|
|
* in a paused state.
|
|
* @property {Function} pause - a function that pauses the processing of tasks
|
|
* until `resume()` is called. Invoke with `queue.pause()`.
|
|
* @property {Function} resume - a function that resumes the processing of
|
|
* queued tasks when the queue is paused. Invoke with `queue.resume()`.
|
|
* @property {Function} kill - a function that removes the `drain` callback and
|
|
* empties remaining tasks from the queue forcing it to go idle. No more tasks
|
|
* should be pushed to the queue after calling this function. Invoke with `queue.kill()`.
|
|
*/
|
|
|
|
/**
|
|
* Creates a `queue` object with the specified `concurrency`. Tasks added to the
|
|
* `queue` are processed in parallel (up to the `concurrency` limit). If all
|
|
* `worker`s are in progress, the task is queued until one becomes available.
|
|
* Once a `worker` completes a `task`, that `task`'s callback is called.
|
|
*
|
|
* @name queue
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {AsyncFunction} worker - An async function for processing a queued task.
|
|
* If you want to handle errors from an individual task, pass a callback to
|
|
* `q.push()`. Invoked with (task, callback).
|
|
* @param {number} [concurrency=1] - An `integer` for determining how many
|
|
* `worker` functions should be run in parallel. If omitted, the concurrency
|
|
* defaults to `1`. If the concurrency is `0`, an error is thrown.
|
|
* @returns {module:ControlFlow.QueueObject} A queue object to manage the tasks. Callbacks can
|
|
* attached as certain properties to listen for specific events during the
|
|
* lifecycle of the queue.
|
|
* @example
|
|
*
|
|
* // create a queue object with concurrency 2
|
|
* var q = async.queue(function(task, callback) {
|
|
* console.log('hello ' + task.name);
|
|
* callback();
|
|
* }, 2);
|
|
*
|
|
* // assign a callback
|
|
* q.drain = function() {
|
|
* console.log('all items have been processed');
|
|
* };
|
|
*
|
|
* // add some items to the queue
|
|
* q.push({name: 'foo'}, function(err) {
|
|
* console.log('finished processing foo');
|
|
* });
|
|
* q.push({name: 'bar'}, function (err) {
|
|
* console.log('finished processing bar');
|
|
* });
|
|
*
|
|
* // add some items to the queue (batch-wise)
|
|
* q.push([{name: 'baz'},{name: 'bay'},{name: 'bax'}], function(err) {
|
|
* console.log('finished processing item');
|
|
* });
|
|
*
|
|
* // add some items to the front of the queue
|
|
* q.unshift({name: 'bar'}, function (err) {
|
|
* console.log('finished processing bar');
|
|
* });
|
|
*/
|
|
var queue$1 = function (worker, concurrency) {
|
|
var _worker = wrapAsync(worker);
|
|
return queue(function (items, cb) {
|
|
_worker(items[0], cb);
|
|
}, concurrency, 1);
|
|
};
|
|
|
|
/**
|
|
* The same as [async.queue]{@link module:ControlFlow.queue} only tasks are assigned a priority and
|
|
* completed in ascending priority order.
|
|
*
|
|
* @name priorityQueue
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.queue]{@link module:ControlFlow.queue}
|
|
* @category Control Flow
|
|
* @param {AsyncFunction} worker - An async function for processing a queued task.
|
|
* If you want to handle errors from an individual task, pass a callback to
|
|
* `q.push()`.
|
|
* Invoked with (task, callback).
|
|
* @param {number} concurrency - An `integer` for determining how many `worker`
|
|
* functions should be run in parallel. If omitted, the concurrency defaults to
|
|
* `1`. If the concurrency is `0`, an error is thrown.
|
|
* @returns {module:ControlFlow.QueueObject} A priorityQueue object to manage the tasks. There are two
|
|
* differences between `queue` and `priorityQueue` objects:
|
|
* * `push(task, priority, [callback])` - `priority` should be a number. If an
|
|
* array of `tasks` is given, all tasks will be assigned the same priority.
|
|
* * The `unshift` method was removed.
|
|
*/
|
|
var priorityQueue = function(worker, concurrency) {
|
|
// Start with a normal queue
|
|
var q = queue$1(worker, concurrency);
|
|
|
|
// Override push to accept second parameter representing priority
|
|
q.push = function(data, priority, callback) {
|
|
if (callback == null) callback = noop;
|
|
if (typeof callback !== 'function') {
|
|
throw new Error('task callback must be a function');
|
|
}
|
|
q.started = true;
|
|
if (!isArray(data)) {
|
|
data = [data];
|
|
}
|
|
if (data.length === 0) {
|
|
// call drain immediately if there are no tasks
|
|
return setImmediate$1(function() {
|
|
q.drain();
|
|
});
|
|
}
|
|
|
|
priority = priority || 0;
|
|
var nextNode = q._tasks.head;
|
|
while (nextNode && priority >= nextNode.priority) {
|
|
nextNode = nextNode.next;
|
|
}
|
|
|
|
for (var i = 0, l = data.length; i < l; i++) {
|
|
var item = {
|
|
data: data[i],
|
|
priority: priority,
|
|
callback: callback
|
|
};
|
|
|
|
if (nextNode) {
|
|
q._tasks.insertBefore(nextNode, item);
|
|
} else {
|
|
q._tasks.push(item);
|
|
}
|
|
}
|
|
setImmediate$1(q.process);
|
|
};
|
|
|
|
// Remove unshift function
|
|
delete q.unshift;
|
|
|
|
return q;
|
|
};
|
|
|
|
/**
|
|
* Runs the `tasks` array of functions in parallel, without waiting until the
|
|
* previous function has completed. Once any of the `tasks` complete or pass an
|
|
* error to its callback, the main `callback` is immediately called. It's
|
|
* equivalent to `Promise.race()`.
|
|
*
|
|
* @name race
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {Array} tasks - An array containing [async functions]{@link AsyncFunction}
|
|
* to run. Each function can complete with an optional `result` value.
|
|
* @param {Function} callback - A callback to run once any of the functions have
|
|
* completed. This function gets an error or result from the first function that
|
|
* completed. Invoked with (err, result).
|
|
* @returns undefined
|
|
* @example
|
|
*
|
|
* async.race([
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'one');
|
|
* }, 200);
|
|
* },
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'two');
|
|
* }, 100);
|
|
* }
|
|
* ],
|
|
* // main callback
|
|
* function(err, result) {
|
|
* // the result will be equal to 'two' as it finishes earlier
|
|
* });
|
|
*/
|
|
function race(tasks, callback) {
|
|
callback = once(callback || noop);
|
|
if (!isArray(tasks)) return callback(new TypeError('First argument to race must be an array of functions'));
|
|
if (!tasks.length) return callback();
|
|
for (var i = 0, l = tasks.length; i < l; i++) {
|
|
wrapAsync(tasks[i])(callback);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Same as [`reduce`]{@link module:Collections.reduce}, only operates on `array` in reverse order.
|
|
*
|
|
* @name reduceRight
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.reduce]{@link module:Collections.reduce}
|
|
* @alias foldr
|
|
* @category Collection
|
|
* @param {Array} array - A collection to iterate over.
|
|
* @param {*} memo - The initial state of the reduction.
|
|
* @param {AsyncFunction} iteratee - A function applied to each item in the
|
|
* array to produce the next step in the reduction.
|
|
* The `iteratee` should complete with the next state of the reduction.
|
|
* If the iteratee complete with an error, the reduction is stopped and the
|
|
* main `callback` is immediately called with the error.
|
|
* Invoked with (memo, item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Result is the reduced value. Invoked with
|
|
* (err, result).
|
|
*/
|
|
function reduceRight (array, memo, iteratee, callback) {
|
|
var reversed = slice(array).reverse();
|
|
reduce(reversed, memo, iteratee, callback);
|
|
}
|
|
|
|
/**
|
|
* Wraps the async function in another function that always completes with a
|
|
* result object, even when it errors.
|
|
*
|
|
* The result object has either the property `error` or `value`.
|
|
*
|
|
* @name reflect
|
|
* @static
|
|
* @memberOf module:Utils
|
|
* @method
|
|
* @category Util
|
|
* @param {AsyncFunction} fn - The async function you want to wrap
|
|
* @returns {Function} - A function that always passes null to it's callback as
|
|
* the error. The second argument to the callback will be an `object` with
|
|
* either an `error` or a `value` property.
|
|
* @example
|
|
*
|
|
* async.parallel([
|
|
* async.reflect(function(callback) {
|
|
* // do some stuff ...
|
|
* callback(null, 'one');
|
|
* }),
|
|
* async.reflect(function(callback) {
|
|
* // do some more stuff but error ...
|
|
* callback('bad stuff happened');
|
|
* }),
|
|
* async.reflect(function(callback) {
|
|
* // do some more stuff ...
|
|
* callback(null, 'two');
|
|
* })
|
|
* ],
|
|
* // optional callback
|
|
* function(err, results) {
|
|
* // values
|
|
* // results[0].value = 'one'
|
|
* // results[1].error = 'bad stuff happened'
|
|
* // results[2].value = 'two'
|
|
* });
|
|
*/
|
|
function reflect(fn) {
|
|
var _fn = wrapAsync(fn);
|
|
return initialParams(function reflectOn(args, reflectCallback) {
|
|
args.push(function callback(error, cbArg) {
|
|
if (error) {
|
|
reflectCallback(null, { error: error });
|
|
} else {
|
|
var value;
|
|
if (arguments.length <= 2) {
|
|
value = cbArg;
|
|
} else {
|
|
value = slice(arguments, 1);
|
|
}
|
|
reflectCallback(null, { value: value });
|
|
}
|
|
});
|
|
|
|
return _fn.apply(this, args);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* A helper function that wraps an array or an object of functions with `reflect`.
|
|
*
|
|
* @name reflectAll
|
|
* @static
|
|
* @memberOf module:Utils
|
|
* @method
|
|
* @see [async.reflect]{@link module:Utils.reflect}
|
|
* @category Util
|
|
* @param {Array|Object|Iterable} tasks - The collection of
|
|
* [async functions]{@link AsyncFunction} to wrap in `async.reflect`.
|
|
* @returns {Array} Returns an array of async functions, each wrapped in
|
|
* `async.reflect`
|
|
* @example
|
|
*
|
|
* let tasks = [
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'one');
|
|
* }, 200);
|
|
* },
|
|
* function(callback) {
|
|
* // do some more stuff but error ...
|
|
* callback(new Error('bad stuff happened'));
|
|
* },
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'two');
|
|
* }, 100);
|
|
* }
|
|
* ];
|
|
*
|
|
* async.parallel(async.reflectAll(tasks),
|
|
* // optional callback
|
|
* function(err, results) {
|
|
* // values
|
|
* // results[0].value = 'one'
|
|
* // results[1].error = Error('bad stuff happened')
|
|
* // results[2].value = 'two'
|
|
* });
|
|
*
|
|
* // an example using an object instead of an array
|
|
* let tasks = {
|
|
* one: function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'one');
|
|
* }, 200);
|
|
* },
|
|
* two: function(callback) {
|
|
* callback('two');
|
|
* },
|
|
* three: function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'three');
|
|
* }, 100);
|
|
* }
|
|
* };
|
|
*
|
|
* async.parallel(async.reflectAll(tasks),
|
|
* // optional callback
|
|
* function(err, results) {
|
|
* // values
|
|
* // results.one.value = 'one'
|
|
* // results.two.error = 'two'
|
|
* // results.three.value = 'three'
|
|
* });
|
|
*/
|
|
function reflectAll(tasks) {
|
|
var results;
|
|
if (isArray(tasks)) {
|
|
results = arrayMap(tasks, reflect);
|
|
} else {
|
|
results = {};
|
|
baseForOwn(tasks, function(task, key) {
|
|
results[key] = reflect.call(this, task);
|
|
});
|
|
}
|
|
return results;
|
|
}
|
|
|
|
function reject$1(eachfn, arr, iteratee, callback) {
|
|
_filter(eachfn, arr, function(value, cb) {
|
|
iteratee(value, function(err, v) {
|
|
cb(err, !v);
|
|
});
|
|
}, callback);
|
|
}
|
|
|
|
/**
|
|
* The opposite of [`filter`]{@link module:Collections.filter}. Removes values that pass an `async` truth test.
|
|
*
|
|
* @name reject
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.filter]{@link module:Collections.filter}
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {Function} iteratee - An async truth test to apply to each item in
|
|
* `coll`.
|
|
* The should complete with a boolean value as its `result`.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Invoked with (err, results).
|
|
* @example
|
|
*
|
|
* async.reject(['file1','file2','file3'], function(filePath, callback) {
|
|
* fs.access(filePath, function(err) {
|
|
* callback(null, !err)
|
|
* });
|
|
* }, function(err, results) {
|
|
* // results now equals an array of missing files
|
|
* createFiles(results);
|
|
* });
|
|
*/
|
|
var reject = doParallel(reject$1);
|
|
|
|
/**
|
|
* The same as [`reject`]{@link module:Collections.reject} but runs a maximum of `limit` async operations at a
|
|
* time.
|
|
*
|
|
* @name rejectLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.reject]{@link module:Collections.reject}
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {Function} iteratee - An async truth test to apply to each item in
|
|
* `coll`.
|
|
* The should complete with a boolean value as its `result`.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Invoked with (err, results).
|
|
*/
|
|
var rejectLimit = doParallelLimit(reject$1);
|
|
|
|
/**
|
|
* The same as [`reject`]{@link module:Collections.reject} but runs only a single async operation at a time.
|
|
*
|
|
* @name rejectSeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.reject]{@link module:Collections.reject}
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {Function} iteratee - An async truth test to apply to each item in
|
|
* `coll`.
|
|
* The should complete with a boolean value as its `result`.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Invoked with (err, results).
|
|
*/
|
|
var rejectSeries = doLimit(rejectLimit, 1);
|
|
|
|
/**
|
|
* Creates a function that returns `value`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @since 2.4.0
|
|
* @category Util
|
|
* @param {*} value The value to return from the new function.
|
|
* @returns {Function} Returns the new constant function.
|
|
* @example
|
|
*
|
|
* var objects = _.times(2, _.constant({ 'a': 1 }));
|
|
*
|
|
* console.log(objects);
|
|
* // => [{ 'a': 1 }, { 'a': 1 }]
|
|
*
|
|
* console.log(objects[0] === objects[1]);
|
|
* // => true
|
|
*/
|
|
function constant$1(value) {
|
|
return function() {
|
|
return value;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Attempts to get a successful response from `task` no more than `times` times
|
|
* before returning an error. If the task is successful, the `callback` will be
|
|
* passed the result of the successful task. If all attempts fail, the callback
|
|
* will be passed the error and result (if any) of the final attempt.
|
|
*
|
|
* @name retry
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @see [async.retryable]{@link module:ControlFlow.retryable}
|
|
* @param {Object|number} [opts = {times: 5, interval: 0}| 5] - Can be either an
|
|
* object with `times` and `interval` or a number.
|
|
* * `times` - The number of attempts to make before giving up. The default
|
|
* is `5`.
|
|
* * `interval` - The time to wait between retries, in milliseconds. The
|
|
* default is `0`. The interval may also be specified as a function of the
|
|
* retry count (see example).
|
|
* * `errorFilter` - An optional synchronous function that is invoked on
|
|
* erroneous result. If it returns `true` the retry attempts will continue;
|
|
* if the function returns `false` the retry flow is aborted with the current
|
|
* attempt's error and result being returned to the final callback.
|
|
* Invoked with (err).
|
|
* * If `opts` is a number, the number specifies the number of times to retry,
|
|
* with the default interval of `0`.
|
|
* @param {AsyncFunction} task - An async function to retry.
|
|
* Invoked with (callback).
|
|
* @param {Function} [callback] - An optional callback which is called when the
|
|
* task has succeeded, or after the final failed attempt. It receives the `err`
|
|
* and `result` arguments of the last attempt at completing the `task`. Invoked
|
|
* with (err, results).
|
|
*
|
|
* @example
|
|
*
|
|
* // The `retry` function can be used as a stand-alone control flow by passing
|
|
* // a callback, as shown below:
|
|
*
|
|
* // try calling apiMethod 3 times
|
|
* async.retry(3, apiMethod, function(err, result) {
|
|
* // do something with the result
|
|
* });
|
|
*
|
|
* // try calling apiMethod 3 times, waiting 200 ms between each retry
|
|
* async.retry({times: 3, interval: 200}, apiMethod, function(err, result) {
|
|
* // do something with the result
|
|
* });
|
|
*
|
|
* // try calling apiMethod 10 times with exponential backoff
|
|
* // (i.e. intervals of 100, 200, 400, 800, 1600, ... milliseconds)
|
|
* async.retry({
|
|
* times: 10,
|
|
* interval: function(retryCount) {
|
|
* return 50 * Math.pow(2, retryCount);
|
|
* }
|
|
* }, apiMethod, function(err, result) {
|
|
* // do something with the result
|
|
* });
|
|
*
|
|
* // try calling apiMethod the default 5 times no delay between each retry
|
|
* async.retry(apiMethod, function(err, result) {
|
|
* // do something with the result
|
|
* });
|
|
*
|
|
* // try calling apiMethod only when error condition satisfies, all other
|
|
* // errors will abort the retry control flow and return to final callback
|
|
* async.retry({
|
|
* errorFilter: function(err) {
|
|
* return err.message === 'Temporary error'; // only retry on a specific error
|
|
* }
|
|
* }, apiMethod, function(err, result) {
|
|
* // do something with the result
|
|
* });
|
|
*
|
|
* // to retry individual methods that are not as reliable within other
|
|
* // control flow functions, use the `retryable` wrapper:
|
|
* async.auto({
|
|
* users: api.getUsers.bind(api),
|
|
* payments: async.retryable(3, api.getPayments.bind(api))
|
|
* }, function(err, results) {
|
|
* // do something with the results
|
|
* });
|
|
*
|
|
*/
|
|
function retry(opts, task, callback) {
|
|
var DEFAULT_TIMES = 5;
|
|
var DEFAULT_INTERVAL = 0;
|
|
|
|
var options = {
|
|
times: DEFAULT_TIMES,
|
|
intervalFunc: constant$1(DEFAULT_INTERVAL)
|
|
};
|
|
|
|
function parseTimes(acc, t) {
|
|
if (typeof t === 'object') {
|
|
acc.times = +t.times || DEFAULT_TIMES;
|
|
|
|
acc.intervalFunc = typeof t.interval === 'function' ?
|
|
t.interval :
|
|
constant$1(+t.interval || DEFAULT_INTERVAL);
|
|
|
|
acc.errorFilter = t.errorFilter;
|
|
} else if (typeof t === 'number' || typeof t === 'string') {
|
|
acc.times = +t || DEFAULT_TIMES;
|
|
} else {
|
|
throw new Error("Invalid arguments for async.retry");
|
|
}
|
|
}
|
|
|
|
if (arguments.length < 3 && typeof opts === 'function') {
|
|
callback = task || noop;
|
|
task = opts;
|
|
} else {
|
|
parseTimes(options, opts);
|
|
callback = callback || noop;
|
|
}
|
|
|
|
if (typeof task !== 'function') {
|
|
throw new Error("Invalid arguments for async.retry");
|
|
}
|
|
|
|
var _task = wrapAsync(task);
|
|
|
|
var attempt = 1;
|
|
function retryAttempt() {
|
|
_task(function(err) {
|
|
if (err && attempt++ < options.times &&
|
|
(typeof options.errorFilter != 'function' ||
|
|
options.errorFilter(err))) {
|
|
setTimeout(retryAttempt, options.intervalFunc(attempt));
|
|
} else {
|
|
callback.apply(null, arguments);
|
|
}
|
|
});
|
|
}
|
|
|
|
retryAttempt();
|
|
}
|
|
|
|
/**
|
|
* A close relative of [`retry`]{@link module:ControlFlow.retry}. This method
|
|
* wraps a task and makes it retryable, rather than immediately calling it
|
|
* with retries.
|
|
*
|
|
* @name retryable
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.retry]{@link module:ControlFlow.retry}
|
|
* @category Control Flow
|
|
* @param {Object|number} [opts = {times: 5, interval: 0}| 5] - optional
|
|
* options, exactly the same as from `retry`
|
|
* @param {AsyncFunction} task - the asynchronous function to wrap.
|
|
* This function will be passed any arguments passed to the returned wrapper.
|
|
* Invoked with (...args, callback).
|
|
* @returns {AsyncFunction} The wrapped function, which when invoked, will
|
|
* retry on an error, based on the parameters specified in `opts`.
|
|
* This function will accept the same parameters as `task`.
|
|
* @example
|
|
*
|
|
* async.auto({
|
|
* dep1: async.retryable(3, getFromFlakyService),
|
|
* process: ["dep1", async.retryable(3, function (results, cb) {
|
|
* maybeProcessData(results.dep1, cb);
|
|
* })]
|
|
* }, callback);
|
|
*/
|
|
var retryable = function (opts, task) {
|
|
if (!task) {
|
|
task = opts;
|
|
opts = null;
|
|
}
|
|
var _task = wrapAsync(task);
|
|
return initialParams(function (args, callback) {
|
|
function taskFn(cb) {
|
|
_task.apply(null, args.concat(cb));
|
|
}
|
|
|
|
if (opts) retry(opts, taskFn, callback);
|
|
else retry(taskFn, callback);
|
|
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Run the functions in the `tasks` collection in series, each one running once
|
|
* the previous function has completed. If any functions in the series pass an
|
|
* error to its callback, no more functions are run, and `callback` is
|
|
* immediately called with the value of the error. Otherwise, `callback`
|
|
* receives an array of results when `tasks` have completed.
|
|
*
|
|
* It is also possible to use an object instead of an array. Each property will
|
|
* be run as a function, and the results will be passed to the final `callback`
|
|
* as an object instead of an array. This can be a more readable way of handling
|
|
* results from {@link async.series}.
|
|
*
|
|
* **Note** that while many implementations preserve the order of object
|
|
* properties, the [ECMAScript Language Specification](http://www.ecma-international.org/ecma-262/5.1/#sec-8.6)
|
|
* explicitly states that
|
|
*
|
|
* > The mechanics and order of enumerating the properties is not specified.
|
|
*
|
|
* So if you rely on the order in which your series of functions are executed,
|
|
* and want this to work on all platforms, consider using an array.
|
|
*
|
|
* @name series
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {Array|Iterable|Object} tasks - A collection containing
|
|
* [async functions]{@link AsyncFunction} to run in series.
|
|
* Each function can complete with any number of optional `result` values.
|
|
* @param {Function} [callback] - An optional callback to run once all the
|
|
* functions have completed. This function gets a results array (or object)
|
|
* containing all the result arguments passed to the `task` callbacks. Invoked
|
|
* with (err, result).
|
|
* @example
|
|
* async.series([
|
|
* function(callback) {
|
|
* // do some stuff ...
|
|
* callback(null, 'one');
|
|
* },
|
|
* function(callback) {
|
|
* // do some more stuff ...
|
|
* callback(null, 'two');
|
|
* }
|
|
* ],
|
|
* // optional callback
|
|
* function(err, results) {
|
|
* // results is now equal to ['one', 'two']
|
|
* });
|
|
*
|
|
* async.series({
|
|
* one: function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 1);
|
|
* }, 200);
|
|
* },
|
|
* two: function(callback){
|
|
* setTimeout(function() {
|
|
* callback(null, 2);
|
|
* }, 100);
|
|
* }
|
|
* }, function(err, results) {
|
|
* // results is now equal to: {one: 1, two: 2}
|
|
* });
|
|
*/
|
|
function series(tasks, callback) {
|
|
_parallel(eachOfSeries, tasks, callback);
|
|
}
|
|
|
|
/**
|
|
* Returns `true` if at least one element in the `coll` satisfies an async test.
|
|
* If any iteratee call returns `true`, the main `callback` is immediately
|
|
* called.
|
|
*
|
|
* @name some
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @alias any
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async truth test to apply to each item
|
|
* in the collections in parallel.
|
|
* The iteratee should complete with a boolean `result` value.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called as soon as any
|
|
* iteratee returns `true`, or after all the iteratee functions have finished.
|
|
* Result will be either `true` or `false` depending on the values of the async
|
|
* tests. Invoked with (err, result).
|
|
* @example
|
|
*
|
|
* async.some(['file1','file2','file3'], function(filePath, callback) {
|
|
* fs.access(filePath, function(err) {
|
|
* callback(null, !err)
|
|
* });
|
|
* }, function(err, result) {
|
|
* // if result is true then at least one of the files exists
|
|
* });
|
|
*/
|
|
var some = doParallel(_createTester(Boolean, identity));
|
|
|
|
/**
|
|
* The same as [`some`]{@link module:Collections.some} but runs a maximum of `limit` async operations at a time.
|
|
*
|
|
* @name someLimit
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.some]{@link module:Collections.some}
|
|
* @alias anyLimit
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - An async truth test to apply to each item
|
|
* in the collections in parallel.
|
|
* The iteratee should complete with a boolean `result` value.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called as soon as any
|
|
* iteratee returns `true`, or after all the iteratee functions have finished.
|
|
* Result will be either `true` or `false` depending on the values of the async
|
|
* tests. Invoked with (err, result).
|
|
*/
|
|
var someLimit = doParallelLimit(_createTester(Boolean, identity));
|
|
|
|
/**
|
|
* The same as [`some`]{@link module:Collections.some} but runs only a single async operation at a time.
|
|
*
|
|
* @name someSeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.some]{@link module:Collections.some}
|
|
* @alias anySeries
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async truth test to apply to each item
|
|
* in the collections in series.
|
|
* The iteratee should complete with a boolean `result` value.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} [callback] - A callback which is called as soon as any
|
|
* iteratee returns `true`, or after all the iteratee functions have finished.
|
|
* Result will be either `true` or `false` depending on the values of the async
|
|
* tests. Invoked with (err, result).
|
|
*/
|
|
var someSeries = doLimit(someLimit, 1);
|
|
|
|
/**
|
|
* Sorts a list by the results of running each `coll` value through an async
|
|
* `iteratee`.
|
|
*
|
|
* @name sortBy
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {AsyncFunction} iteratee - An async function to apply to each item in
|
|
* `coll`.
|
|
* The iteratee should complete with a value to use as the sort criteria as
|
|
* its `result`.
|
|
* Invoked with (item, callback).
|
|
* @param {Function} callback - A callback which is called after all the
|
|
* `iteratee` functions have finished, or an error occurs. Results is the items
|
|
* from the original `coll` sorted by the values returned by the `iteratee`
|
|
* calls. Invoked with (err, results).
|
|
* @example
|
|
*
|
|
* async.sortBy(['file1','file2','file3'], function(file, callback) {
|
|
* fs.stat(file, function(err, stats) {
|
|
* callback(err, stats.mtime);
|
|
* });
|
|
* }, function(err, results) {
|
|
* // results is now the original array of files sorted by
|
|
* // modified date
|
|
* });
|
|
*
|
|
* // By modifying the callback parameter the
|
|
* // sorting order can be influenced:
|
|
*
|
|
* // ascending order
|
|
* async.sortBy([1,9,3,5], function(x, callback) {
|
|
* callback(null, x);
|
|
* }, function(err,result) {
|
|
* // result callback
|
|
* });
|
|
*
|
|
* // descending order
|
|
* async.sortBy([1,9,3,5], function(x, callback) {
|
|
* callback(null, x*-1); //<- x*-1 instead of x, turns the order around
|
|
* }, function(err,result) {
|
|
* // result callback
|
|
* });
|
|
*/
|
|
function sortBy (coll, iteratee, callback) {
|
|
var _iteratee = wrapAsync(iteratee);
|
|
map(coll, function (x, callback) {
|
|
_iteratee(x, function (err, criteria) {
|
|
if (err) return callback(err);
|
|
callback(null, {value: x, criteria: criteria});
|
|
});
|
|
}, function (err, results) {
|
|
if (err) return callback(err);
|
|
callback(null, arrayMap(results.sort(comparator), baseProperty('value')));
|
|
});
|
|
|
|
function comparator(left, right) {
|
|
var a = left.criteria, b = right.criteria;
|
|
return a < b ? -1 : a > b ? 1 : 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sets a time limit on an asynchronous function. If the function does not call
|
|
* its callback within the specified milliseconds, it will be called with a
|
|
* timeout error. The code property for the error object will be `'ETIMEDOUT'`.
|
|
*
|
|
* @name timeout
|
|
* @static
|
|
* @memberOf module:Utils
|
|
* @method
|
|
* @category Util
|
|
* @param {AsyncFunction} asyncFn - The async function to limit in time.
|
|
* @param {number} milliseconds - The specified time limit.
|
|
* @param {*} [info] - Any variable you want attached (`string`, `object`, etc)
|
|
* to timeout Error for more information..
|
|
* @returns {AsyncFunction} Returns a wrapped function that can be used with any
|
|
* of the control flow functions.
|
|
* Invoke this function with the same parameters as you would `asyncFunc`.
|
|
* @example
|
|
*
|
|
* function myFunction(foo, callback) {
|
|
* doAsyncTask(foo, function(err, data) {
|
|
* // handle errors
|
|
* if (err) return callback(err);
|
|
*
|
|
* // do some stuff ...
|
|
*
|
|
* // return processed data
|
|
* return callback(null, data);
|
|
* });
|
|
* }
|
|
*
|
|
* var wrapped = async.timeout(myFunction, 1000);
|
|
*
|
|
* // call `wrapped` as you would `myFunction`
|
|
* wrapped({ bar: 'bar' }, function(err, data) {
|
|
* // if `myFunction` takes < 1000 ms to execute, `err`
|
|
* // and `data` will have their expected values
|
|
*
|
|
* // else `err` will be an Error with the code 'ETIMEDOUT'
|
|
* });
|
|
*/
|
|
function timeout(asyncFn, milliseconds, info) {
|
|
var fn = wrapAsync(asyncFn);
|
|
|
|
return initialParams(function (args, callback) {
|
|
var timedOut = false;
|
|
var timer;
|
|
|
|
function timeoutCallback() {
|
|
var name = asyncFn.name || 'anonymous';
|
|
var error = new Error('Callback function "' + name + '" timed out.');
|
|
error.code = 'ETIMEDOUT';
|
|
if (info) {
|
|
error.info = info;
|
|
}
|
|
timedOut = true;
|
|
callback(error);
|
|
}
|
|
|
|
args.push(function () {
|
|
if (!timedOut) {
|
|
callback.apply(null, arguments);
|
|
clearTimeout(timer);
|
|
}
|
|
});
|
|
|
|
// setup timer and call original function
|
|
timer = setTimeout(timeoutCallback, milliseconds);
|
|
fn.apply(null, args);
|
|
});
|
|
}
|
|
|
|
/* Built-in method references for those with the same name as other `lodash` methods. */
|
|
var nativeCeil = Math.ceil;
|
|
var nativeMax = Math.max;
|
|
|
|
/**
|
|
* The base implementation of `_.range` and `_.rangeRight` which doesn't
|
|
* coerce arguments.
|
|
*
|
|
* @private
|
|
* @param {number} start The start of the range.
|
|
* @param {number} end The end of the range.
|
|
* @param {number} step The value to increment or decrement by.
|
|
* @param {boolean} [fromRight] Specify iterating from right to left.
|
|
* @returns {Array} Returns the range of numbers.
|
|
*/
|
|
function baseRange(start, end, step, fromRight) {
|
|
var index = -1,
|
|
length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
|
|
result = Array(length);
|
|
|
|
while (length--) {
|
|
result[fromRight ? length : ++index] = start;
|
|
start += step;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* The same as [times]{@link module:ControlFlow.times} but runs a maximum of `limit` async operations at a
|
|
* time.
|
|
*
|
|
* @name timesLimit
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.times]{@link module:ControlFlow.times}
|
|
* @category Control Flow
|
|
* @param {number} count - The number of times to run the function.
|
|
* @param {number} limit - The maximum number of async operations at a time.
|
|
* @param {AsyncFunction} iteratee - The async function to call `n` times.
|
|
* Invoked with the iteration index and a callback: (n, next).
|
|
* @param {Function} callback - see [async.map]{@link module:Collections.map}.
|
|
*/
|
|
function timeLimit(count, limit, iteratee, callback) {
|
|
var _iteratee = wrapAsync(iteratee);
|
|
mapLimit(baseRange(0, count, 1), limit, _iteratee, callback);
|
|
}
|
|
|
|
/**
|
|
* Calls the `iteratee` function `n` times, and accumulates results in the same
|
|
* manner you would use with [map]{@link module:Collections.map}.
|
|
*
|
|
* @name times
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.map]{@link module:Collections.map}
|
|
* @category Control Flow
|
|
* @param {number} n - The number of times to run the function.
|
|
* @param {AsyncFunction} iteratee - The async function to call `n` times.
|
|
* Invoked with the iteration index and a callback: (n, next).
|
|
* @param {Function} callback - see {@link module:Collections.map}.
|
|
* @example
|
|
*
|
|
* // Pretend this is some complicated async factory
|
|
* var createUser = function(id, callback) {
|
|
* callback(null, {
|
|
* id: 'user' + id
|
|
* });
|
|
* };
|
|
*
|
|
* // generate 5 users
|
|
* async.times(5, function(n, next) {
|
|
* createUser(n, function(err, user) {
|
|
* next(err, user);
|
|
* });
|
|
* }, function(err, users) {
|
|
* // we should now have 5 users
|
|
* });
|
|
*/
|
|
var times = doLimit(timeLimit, Infinity);
|
|
|
|
/**
|
|
* The same as [times]{@link module:ControlFlow.times} but runs only a single async operation at a time.
|
|
*
|
|
* @name timesSeries
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.times]{@link module:ControlFlow.times}
|
|
* @category Control Flow
|
|
* @param {number} n - The number of times to run the function.
|
|
* @param {AsyncFunction} iteratee - The async function to call `n` times.
|
|
* Invoked with the iteration index and a callback: (n, next).
|
|
* @param {Function} callback - see {@link module:Collections.map}.
|
|
*/
|
|
var timesSeries = doLimit(timeLimit, 1);
|
|
|
|
/**
|
|
* A relative of `reduce`. Takes an Object or Array, and iterates over each
|
|
* element in series, each step potentially mutating an `accumulator` value.
|
|
* The type of the accumulator defaults to the type of collection passed in.
|
|
*
|
|
* @name transform
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @category Collection
|
|
* @param {Array|Iterable|Object} coll - A collection to iterate over.
|
|
* @param {*} [accumulator] - The initial state of the transform. If omitted,
|
|
* it will default to an empty Object or Array, depending on the type of `coll`
|
|
* @param {AsyncFunction} iteratee - A function applied to each item in the
|
|
* collection that potentially modifies the accumulator.
|
|
* Invoked with (accumulator, item, key, callback).
|
|
* @param {Function} [callback] - A callback which is called after all the
|
|
* `iteratee` functions have finished. Result is the transformed accumulator.
|
|
* Invoked with (err, result).
|
|
* @example
|
|
*
|
|
* async.transform([1,2,3], function(acc, item, index, callback) {
|
|
* // pointless async:
|
|
* process.nextTick(function() {
|
|
* acc.push(item * 2)
|
|
* callback(null)
|
|
* });
|
|
* }, function(err, result) {
|
|
* // result is now equal to [2, 4, 6]
|
|
* });
|
|
*
|
|
* @example
|
|
*
|
|
* async.transform({a: 1, b: 2, c: 3}, function (obj, val, key, callback) {
|
|
* setImmediate(function () {
|
|
* obj[key] = val * 2;
|
|
* callback();
|
|
* })
|
|
* }, function (err, result) {
|
|
* // result is equal to {a: 2, b: 4, c: 6}
|
|
* })
|
|
*/
|
|
function transform (coll, accumulator, iteratee, callback) {
|
|
if (arguments.length <= 3) {
|
|
callback = iteratee;
|
|
iteratee = accumulator;
|
|
accumulator = isArray(coll) ? [] : {};
|
|
}
|
|
callback = once(callback || noop);
|
|
var _iteratee = wrapAsync(iteratee);
|
|
|
|
eachOf(coll, function(v, k, cb) {
|
|
_iteratee(accumulator, v, k, cb);
|
|
}, function(err) {
|
|
callback(err, accumulator);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* It runs each task in series but stops whenever any of the functions were
|
|
* successful. If one of the tasks were successful, the `callback` will be
|
|
* passed the result of the successful task. If all tasks fail, the callback
|
|
* will be passed the error and result (if any) of the final attempt.
|
|
*
|
|
* @name tryEach
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {Array|Iterable|Object} tasks - A collection containing functions to
|
|
* run, each function is passed a `callback(err, result)` it must call on
|
|
* completion with an error `err` (which can be `null`) and an optional `result`
|
|
* value.
|
|
* @param {Function} [callback] - An optional callback which is called when one
|
|
* of the tasks has succeeded, or all have failed. It receives the `err` and
|
|
* `result` arguments of the last attempt at completing the `task`. Invoked with
|
|
* (err, results).
|
|
* @example
|
|
* async.tryEach([
|
|
* function getDataFromFirstWebsite(callback) {
|
|
* // Try getting the data from the first website
|
|
* callback(err, data);
|
|
* },
|
|
* function getDataFromSecondWebsite(callback) {
|
|
* // First website failed,
|
|
* // Try getting the data from the backup website
|
|
* callback(err, data);
|
|
* }
|
|
* ],
|
|
* // optional callback
|
|
* function(err, results) {
|
|
* Now do something with the data.
|
|
* });
|
|
*
|
|
*/
|
|
function tryEach(tasks, callback) {
|
|
var error = null;
|
|
var result;
|
|
callback = callback || noop;
|
|
eachSeries(tasks, function(task, callback) {
|
|
wrapAsync(task)(function (err, res/*, ...args*/) {
|
|
if (arguments.length > 2) {
|
|
result = slice(arguments, 1);
|
|
} else {
|
|
result = res;
|
|
}
|
|
error = err;
|
|
callback(!err);
|
|
});
|
|
}, function () {
|
|
callback(error, result);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Undoes a [memoize]{@link module:Utils.memoize}d function, reverting it to the original,
|
|
* unmemoized form. Handy for testing.
|
|
*
|
|
* @name unmemoize
|
|
* @static
|
|
* @memberOf module:Utils
|
|
* @method
|
|
* @see [async.memoize]{@link module:Utils.memoize}
|
|
* @category Util
|
|
* @param {AsyncFunction} fn - the memoized function
|
|
* @returns {AsyncFunction} a function that calls the original unmemoized function
|
|
*/
|
|
function unmemoize(fn) {
|
|
return function () {
|
|
return (fn.unmemoized || fn).apply(null, arguments);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Repeatedly call `iteratee`, while `test` returns `true`. Calls `callback` when
|
|
* stopped, or an error occurs.
|
|
*
|
|
* @name whilst
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {Function} test - synchronous truth test to perform before each
|
|
* execution of `iteratee`. Invoked with ().
|
|
* @param {AsyncFunction} iteratee - An async function which is called each time
|
|
* `test` passes. Invoked with (callback).
|
|
* @param {Function} [callback] - A callback which is called after the test
|
|
* function has failed and repeated execution of `iteratee` has stopped. `callback`
|
|
* will be passed an error and any arguments passed to the final `iteratee`'s
|
|
* callback. Invoked with (err, [results]);
|
|
* @returns undefined
|
|
* @example
|
|
*
|
|
* var count = 0;
|
|
* async.whilst(
|
|
* function() { return count < 5; },
|
|
* function(callback) {
|
|
* count++;
|
|
* setTimeout(function() {
|
|
* callback(null, count);
|
|
* }, 1000);
|
|
* },
|
|
* function (err, n) {
|
|
* // 5 seconds have passed, n = 5
|
|
* }
|
|
* );
|
|
*/
|
|
function whilst(test, iteratee, callback) {
|
|
callback = onlyOnce(callback || noop);
|
|
var _iteratee = wrapAsync(iteratee);
|
|
if (!test()) return callback(null);
|
|
var next = function(err/*, ...args*/) {
|
|
if (err) return callback(err);
|
|
if (test()) return _iteratee(next);
|
|
var args = slice(arguments, 1);
|
|
callback.apply(null, [null].concat(args));
|
|
};
|
|
_iteratee(next);
|
|
}
|
|
|
|
/**
|
|
* Repeatedly call `iteratee` until `test` returns `true`. Calls `callback` when
|
|
* stopped, or an error occurs. `callback` will be passed an error and any
|
|
* arguments passed to the final `iteratee`'s callback.
|
|
*
|
|
* The inverse of [whilst]{@link module:ControlFlow.whilst}.
|
|
*
|
|
* @name until
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.whilst]{@link module:ControlFlow.whilst}
|
|
* @category Control Flow
|
|
* @param {Function} test - synchronous truth test to perform before each
|
|
* execution of `iteratee`. Invoked with ().
|
|
* @param {AsyncFunction} iteratee - An async function which is called each time
|
|
* `test` fails. Invoked with (callback).
|
|
* @param {Function} [callback] - A callback which is called after the test
|
|
* function has passed and repeated execution of `iteratee` has stopped. `callback`
|
|
* will be passed an error and any arguments passed to the final `iteratee`'s
|
|
* callback. Invoked with (err, [results]);
|
|
*/
|
|
function until(test, iteratee, callback) {
|
|
whilst(function() {
|
|
return !test.apply(this, arguments);
|
|
}, iteratee, callback);
|
|
}
|
|
|
|
/**
|
|
* 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 undefined
|
|
* @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');
|
|
* }
|
|
*/
|
|
var waterfall = function(tasks, callback) {
|
|
callback = once(callback || noop);
|
|
if (!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 = wrapAsync(tasks[taskIndex++]);
|
|
args.push(onlyOnce(next));
|
|
task.apply(null, args);
|
|
}
|
|
|
|
function next(err/*, ...args*/) {
|
|
if (err || taskIndex === tasks.length) {
|
|
return callback.apply(null, arguments);
|
|
}
|
|
nextTask(slice(arguments, 1));
|
|
}
|
|
|
|
nextTask([]);
|
|
};
|
|
|
|
/**
|
|
* An "async function" in the context of Async is an asynchronous function with
|
|
* a variable number of parameters, with the final parameter being a callback.
|
|
* (`function (arg1, arg2, ..., callback) {}`)
|
|
* The final callback is of the form `callback(err, results...)`, which must be
|
|
* called once the function is completed. The callback should be called with a
|
|
* Error as its first argument to signal that an error occurred.
|
|
* Otherwise, if no error occurred, it should be called with `null` as the first
|
|
* argument, and any additional `result` arguments that may apply, to signal
|
|
* successful completion.
|
|
* The callback must be called exactly once, ideally on a later tick of the
|
|
* JavaScript event loop.
|
|
*
|
|
* This type of function is also referred to as a "Node-style async function",
|
|
* or a "continuation passing-style function" (CPS). Most of the methods of this
|
|
* library are themselves CPS/Node-style async functions, or functions that
|
|
* return CPS/Node-style async functions.
|
|
*
|
|
* Wherever we accept a Node-style async function, we also directly accept an
|
|
* [ES2017 `async` function]{@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function}.
|
|
* In this case, the `async` function will not be passed a final callback
|
|
* argument, and any thrown error will be used as the `err` argument of the
|
|
* implicit callback, and the return value will be used as the `result` value.
|
|
* (i.e. a `rejected` of the returned Promise becomes the `err` callback
|
|
* argument, and a `resolved` value becomes the `result`.)
|
|
*
|
|
* Note, due to JavaScript limitations, we can only detect native `async`
|
|
* functions and not transpilied implementations.
|
|
* Your environment must have `async`/`await` support for this to work.
|
|
* (e.g. Node > v7.6, or a recent version of a modern browser).
|
|
* If you are using `async` functions through a transpiler (e.g. Babel), you
|
|
* must still wrap the function with [asyncify]{@link module:Utils.asyncify},
|
|
* because the `async function` will be compiled to an ordinary function that
|
|
* returns a promise.
|
|
*
|
|
* @typedef {Function} AsyncFunction
|
|
* @static
|
|
*/
|
|
|
|
/**
|
|
* Async is a utility module which provides straight-forward, powerful functions
|
|
* for working with asynchronous JavaScript. Although originally designed for
|
|
* use with [Node.js](http://nodejs.org) and installable via
|
|
* `npm install --save async`, it can also be used directly in the browser.
|
|
* @module async
|
|
* @see AsyncFunction
|
|
*/
|
|
|
|
|
|
/**
|
|
* A collection of `async` functions for manipulating collections, such as
|
|
* arrays and objects.
|
|
* @module Collections
|
|
*/
|
|
|
|
/**
|
|
* A collection of `async` functions for controlling the flow through a script.
|
|
* @module ControlFlow
|
|
*/
|
|
|
|
/**
|
|
* A collection of `async` utility functions.
|
|
* @module Utils
|
|
*/
|
|
|
|
var index = {
|
|
apply: apply,
|
|
applyEach: applyEach,
|
|
applyEachSeries: applyEachSeries,
|
|
asyncify: asyncify,
|
|
auto: auto,
|
|
autoInject: autoInject,
|
|
cargo: cargo,
|
|
compose: compose,
|
|
concat: concat,
|
|
concatLimit: concatLimit,
|
|
concatSeries: concatSeries,
|
|
constant: constant,
|
|
detect: detect,
|
|
detectLimit: detectLimit,
|
|
detectSeries: detectSeries,
|
|
dir: dir,
|
|
doDuring: doDuring,
|
|
doUntil: doUntil,
|
|
doWhilst: doWhilst,
|
|
during: during,
|
|
each: eachLimit,
|
|
eachLimit: eachLimit$1,
|
|
eachOf: eachOf,
|
|
eachOfLimit: eachOfLimit,
|
|
eachOfSeries: eachOfSeries,
|
|
eachSeries: eachSeries,
|
|
ensureAsync: ensureAsync,
|
|
every: every,
|
|
everyLimit: everyLimit,
|
|
everySeries: everySeries,
|
|
filter: filter,
|
|
filterLimit: filterLimit,
|
|
filterSeries: filterSeries,
|
|
forever: forever,
|
|
groupBy: groupBy,
|
|
groupByLimit: groupByLimit,
|
|
groupBySeries: groupBySeries,
|
|
log: log,
|
|
map: map,
|
|
mapLimit: mapLimit,
|
|
mapSeries: mapSeries,
|
|
mapValues: mapValues,
|
|
mapValuesLimit: mapValuesLimit,
|
|
mapValuesSeries: mapValuesSeries,
|
|
memoize: memoize,
|
|
nextTick: nextTick,
|
|
parallel: parallelLimit,
|
|
parallelLimit: parallelLimit$1,
|
|
priorityQueue: priorityQueue,
|
|
queue: queue$1,
|
|
race: race,
|
|
reduce: reduce,
|
|
reduceRight: reduceRight,
|
|
reflect: reflect,
|
|
reflectAll: reflectAll,
|
|
reject: reject,
|
|
rejectLimit: rejectLimit,
|
|
rejectSeries: rejectSeries,
|
|
retry: retry,
|
|
retryable: retryable,
|
|
seq: seq,
|
|
series: series,
|
|
setImmediate: setImmediate$1,
|
|
some: some,
|
|
someLimit: someLimit,
|
|
someSeries: someSeries,
|
|
sortBy: sortBy,
|
|
timeout: timeout,
|
|
times: times,
|
|
timesLimit: timeLimit,
|
|
timesSeries: timesSeries,
|
|
transform: transform,
|
|
tryEach: tryEach,
|
|
unmemoize: unmemoize,
|
|
until: until,
|
|
waterfall: waterfall,
|
|
whilst: whilst,
|
|
|
|
// aliases
|
|
all: every,
|
|
allLimit: everyLimit,
|
|
allSeries: everySeries,
|
|
any: some,
|
|
anyLimit: someLimit,
|
|
anySeries: someSeries,
|
|
find: detect,
|
|
findLimit: detectLimit,
|
|
findSeries: detectSeries,
|
|
forEach: eachLimit,
|
|
forEachSeries: eachSeries,
|
|
forEachLimit: eachLimit$1,
|
|
forEachOf: eachOf,
|
|
forEachOfSeries: eachOfSeries,
|
|
forEachOfLimit: eachOfLimit,
|
|
inject: reduce,
|
|
foldl: reduce,
|
|
foldr: reduceRight,
|
|
select: filter,
|
|
selectLimit: filterLimit,
|
|
selectSeries: filterSeries,
|
|
wrapSync: asyncify
|
|
};
|
|
|
|
exports['default'] = index;
|
|
exports.apply = apply;
|
|
exports.applyEach = applyEach;
|
|
exports.applyEachSeries = applyEachSeries;
|
|
exports.asyncify = asyncify;
|
|
exports.auto = auto;
|
|
exports.autoInject = autoInject;
|
|
exports.cargo = cargo;
|
|
exports.compose = compose;
|
|
exports.concat = concat;
|
|
exports.concatLimit = concatLimit;
|
|
exports.concatSeries = concatSeries;
|
|
exports.constant = constant;
|
|
exports.detect = detect;
|
|
exports.detectLimit = detectLimit;
|
|
exports.detectSeries = detectSeries;
|
|
exports.dir = dir;
|
|
exports.doDuring = doDuring;
|
|
exports.doUntil = doUntil;
|
|
exports.doWhilst = doWhilst;
|
|
exports.during = during;
|
|
exports.each = eachLimit;
|
|
exports.eachLimit = eachLimit$1;
|
|
exports.eachOf = eachOf;
|
|
exports.eachOfLimit = eachOfLimit;
|
|
exports.eachOfSeries = eachOfSeries;
|
|
exports.eachSeries = eachSeries;
|
|
exports.ensureAsync = ensureAsync;
|
|
exports.every = every;
|
|
exports.everyLimit = everyLimit;
|
|
exports.everySeries = everySeries;
|
|
exports.filter = filter;
|
|
exports.filterLimit = filterLimit;
|
|
exports.filterSeries = filterSeries;
|
|
exports.forever = forever;
|
|
exports.groupBy = groupBy;
|
|
exports.groupByLimit = groupByLimit;
|
|
exports.groupBySeries = groupBySeries;
|
|
exports.log = log;
|
|
exports.map = map;
|
|
exports.mapLimit = mapLimit;
|
|
exports.mapSeries = mapSeries;
|
|
exports.mapValues = mapValues;
|
|
exports.mapValuesLimit = mapValuesLimit;
|
|
exports.mapValuesSeries = mapValuesSeries;
|
|
exports.memoize = memoize;
|
|
exports.nextTick = nextTick;
|
|
exports.parallel = parallelLimit;
|
|
exports.parallelLimit = parallelLimit$1;
|
|
exports.priorityQueue = priorityQueue;
|
|
exports.queue = queue$1;
|
|
exports.race = race;
|
|
exports.reduce = reduce;
|
|
exports.reduceRight = reduceRight;
|
|
exports.reflect = reflect;
|
|
exports.reflectAll = reflectAll;
|
|
exports.reject = reject;
|
|
exports.rejectLimit = rejectLimit;
|
|
exports.rejectSeries = rejectSeries;
|
|
exports.retry = retry;
|
|
exports.retryable = retryable;
|
|
exports.seq = seq;
|
|
exports.series = series;
|
|
exports.setImmediate = setImmediate$1;
|
|
exports.some = some;
|
|
exports.someLimit = someLimit;
|
|
exports.someSeries = someSeries;
|
|
exports.sortBy = sortBy;
|
|
exports.timeout = timeout;
|
|
exports.times = times;
|
|
exports.timesLimit = timeLimit;
|
|
exports.timesSeries = timesSeries;
|
|
exports.transform = transform;
|
|
exports.tryEach = tryEach;
|
|
exports.unmemoize = unmemoize;
|
|
exports.until = until;
|
|
exports.waterfall = waterfall;
|
|
exports.whilst = whilst;
|
|
exports.all = every;
|
|
exports.allLimit = everyLimit;
|
|
exports.allSeries = everySeries;
|
|
exports.any = some;
|
|
exports.anyLimit = someLimit;
|
|
exports.anySeries = someSeries;
|
|
exports.find = detect;
|
|
exports.findLimit = detectLimit;
|
|
exports.findSeries = detectSeries;
|
|
exports.forEach = eachLimit;
|
|
exports.forEachSeries = eachSeries;
|
|
exports.forEachLimit = eachLimit$1;
|
|
exports.forEachOf = eachOf;
|
|
exports.forEachOfSeries = eachOfSeries;
|
|
exports.forEachOfLimit = eachOfLimit;
|
|
exports.inject = reduce;
|
|
exports.foldl = reduce;
|
|
exports.foldr = reduceRight;
|
|
exports.select = filter;
|
|
exports.selectLimit = filterLimit;
|
|
exports.selectSeries = filterSeries;
|
|
exports.wrapSync = asyncify;
|
|
|
|
Object.defineProperty(exports, '__esModule', { value: true });
|
|
|
|
})));
|