5949 lines
196 KiB
JavaScript
5949 lines
196 KiB
JavaScript
/**
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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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function apply(fn, ...args) {
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return (...callArgs) => fn(...args,...callArgs);
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}
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function initialParams (fn) {
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return function (...args/*, callback*/) {
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var callback = args.pop();
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return fn.call(this, args, callback);
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};
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}
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/* istanbul ignore file */
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var hasQueueMicrotask = typeof queueMicrotask === 'function' && queueMicrotask;
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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 (fn, ...args) => defer(() => fn(...args));
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}
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var _defer$1;
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if (hasQueueMicrotask) {
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_defer$1 = queueMicrotask;
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} else if (hasSetImmediate) {
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_defer$1 = setImmediate;
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} else if (hasNextTick) {
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_defer$1 = process.nextTick;
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} else {
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_defer$1 = fallback;
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}
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var setImmediate$1 = wrap(_defer$1);
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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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if (isAsync(func)) {
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return function (...args/*, callback*/) {
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const callback = args.pop();
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const promise = func.apply(this, args);
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return handlePromise(promise, callback)
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}
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}
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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 (result && typeof result.then === 'function') {
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return handlePromise(result, callback)
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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 handlePromise(promise, callback) {
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return promise.then(value => {
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invokeCallback(callback, null, value);
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}, err => {
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invokeCallback(callback, err && (err instanceof Error || err.message) ? err : new Error(err));
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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 (err) {
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setImmediate$1(e => { throw e }, err);
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}
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}
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function isAsync(fn) {
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return fn[Symbol.toStringTag] === 'AsyncFunction';
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}
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function isAsyncGenerator(fn) {
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return fn[Symbol.toStringTag] === 'AsyncGenerator';
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}
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function isAsyncIterable(obj) {
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return typeof obj[Symbol.asyncIterator] === 'function';
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}
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function wrapAsync(asyncFn) {
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if (typeof asyncFn !== 'function') throw new Error('expected a function')
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return isAsync(asyncFn) ? asyncify(asyncFn) : asyncFn;
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}
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// conditionally promisify a function.
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// only return a promise if a callback is omitted
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function awaitify (asyncFn, arity) {
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if (!arity) arity = asyncFn.length;
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if (!arity) throw new Error('arity is undefined')
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function awaitable (...args) {
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if (typeof args[arity - 1] === 'function') {
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return asyncFn.apply(this, args)
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}
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return new Promise((resolve, reject) => {
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args[arity - 1] = (err, ...cbArgs) => {
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if (err) return reject(err)
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resolve(cbArgs.length > 1 ? cbArgs : cbArgs[0]);
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};
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asyncFn.apply(this, args);
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})
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}
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return awaitable
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}
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function applyEach$1 (eachfn) {
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return function applyEach(fns, ...callArgs) {
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const go = awaitify(function (callback) {
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var that = this;
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return eachfn(fns, (fn, cb) => {
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wrapAsync(fn).apply(that, callArgs.concat(cb));
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}, callback);
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});
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return go;
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};
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}
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function _asyncMap(eachfn, arr, iteratee, callback) {
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arr = arr || [];
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var results = [];
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var counter = 0;
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var _iteratee = wrapAsync(iteratee);
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return eachfn(arr, (value, _, iterCb) => {
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var index = counter++;
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_iteratee(value, (err, v) => {
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results[index] = v;
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iterCb(err);
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});
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}, err => {
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callback(err, results);
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});
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}
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function isArrayLike(value) {
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return value &&
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typeof value.length === 'number' &&
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value.length >= 0 &&
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value.length % 1 === 0;
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}
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// A temporary value used to identify if the loop should be broken.
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// See #1064, #1293
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const breakLoop = {};
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function once(fn) {
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function wrapper (...args) {
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if (fn === null) return;
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var callFn = fn;
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fn = null;
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callFn.apply(this, args);
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}
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Object.assign(wrapper, fn);
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return wrapper
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}
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function getIterator (coll) {
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return coll[Symbol.iterator] && coll[Symbol.iterator]();
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}
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function createArrayIterator(coll) {
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var i = -1;
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var len = coll.length;
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return function next() {
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return ++i < len ? {value: coll[i], key: i} : null;
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}
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}
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function createES2015Iterator(iterator) {
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var i = -1;
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return function next() {
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var item = iterator.next();
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if (item.done)
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return null;
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i++;
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return {value: item.value, key: i};
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}
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}
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function createObjectIterator(obj) {
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var okeys = obj ? Object.keys(obj) : [];
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var i = -1;
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var len = okeys.length;
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return function next() {
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var key = okeys[++i];
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if (key === '__proto__') {
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return next();
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}
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return i < len ? {value: obj[key], key} : null;
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};
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}
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function createIterator(coll) {
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if (isArrayLike(coll)) {
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return createArrayIterator(coll);
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}
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var iterator = getIterator(coll);
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return iterator ? createES2015Iterator(iterator) : createObjectIterator(coll);
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}
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function onlyOnce(fn) {
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return function (...args) {
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if (fn === null) throw new Error("Callback was already called.");
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var callFn = fn;
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fn = null;
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callFn.apply(this, args);
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};
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}
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// for async generators
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function asyncEachOfLimit(generator, limit, iteratee, callback) {
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let done = false;
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let canceled = false;
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let awaiting = false;
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let running = 0;
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let idx = 0;
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function replenish() {
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//console.log('replenish')
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if (running >= limit || awaiting || done) return
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//console.log('replenish awaiting')
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awaiting = true;
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generator.next().then(({value, done: iterDone}) => {
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//console.log('got value', value)
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if (canceled || done) return
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awaiting = false;
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if (iterDone) {
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done = true;
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if (running <= 0) {
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//console.log('done nextCb')
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callback(null);
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}
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return;
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}
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running++;
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iteratee(value, idx, iterateeCallback);
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idx++;
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replenish();
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}).catch(handleError);
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}
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function iterateeCallback(err, result) {
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//console.log('iterateeCallback')
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running -= 1;
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if (canceled) return
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if (err) return handleError(err)
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if (err === false) {
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done = true;
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canceled = true;
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return
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}
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if (result === breakLoop || (done && running <= 0)) {
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done = true;
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//console.log('done iterCb')
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return callback(null);
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}
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replenish();
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}
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function handleError(err) {
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if (canceled) return
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awaiting = false;
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done = true;
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callback(err);
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}
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replenish();
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}
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var eachOfLimit$2 = (limit) => {
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return (obj, iteratee, callback) => {
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callback = once(callback);
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if (limit <= 0) {
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throw new RangeError('concurrency limit cannot be less than 1')
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}
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if (!obj) {
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return callback(null);
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}
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if (isAsyncGenerator(obj)) {
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return asyncEachOfLimit(obj, limit, iteratee, callback)
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}
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if (isAsyncIterable(obj)) {
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return asyncEachOfLimit(obj[Symbol.asyncIterator](), limit, iteratee, callback)
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}
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var nextElem = createIterator(obj);
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var done = false;
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var canceled = false;
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var running = 0;
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var looping = false;
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function iterateeCallback(err, value) {
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if (canceled) return
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running -= 1;
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if (err) {
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done = true;
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callback(err);
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}
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else if (err === false) {
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done = true;
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canceled = true;
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}
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else if (value === breakLoop || (done && running <= 0)) {
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done = true;
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return callback(null);
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}
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else if (!looping) {
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replenish();
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}
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}
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function replenish () {
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looping = true;
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while (running < limit && !done) {
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var elem = nextElem();
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if (elem === null) {
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done = true;
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if (running <= 0) {
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callback(null);
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}
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return;
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}
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running += 1;
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iteratee(elem.value, elem.key, onlyOnce(iterateeCallback));
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}
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looping = false;
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}
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replenish();
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};
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};
|
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/**
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* The same as [`eachOf`]{@link module:Collections.eachOf} but runs a maximum of `limit` async operations at a
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* time.
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*
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* @name eachOfLimit
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* @static
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* @memberOf module:Collections
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* @method
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* @see [async.eachOf]{@link module:Collections.eachOf}
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* @alias forEachOfLimit
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* @category Collection
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* @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
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* @param {number} limit - The maximum number of async operations at a time.
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* @param {AsyncFunction} iteratee - An async function to apply to each
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* item in `coll`. The `key` is the item's key, or index in the case of an
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* array.
|
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* Invoked with (item, key, callback).
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* @param {Function} [callback] - A callback which is called when all
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* `iteratee` functions have finished, or an error occurs. Invoked with (err).
|
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* @returns {Promise} a promise, if a callback is omitted
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*/
|
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function eachOfLimit(coll, limit, iteratee, callback) {
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return eachOfLimit$2(limit)(coll, wrapAsync(iteratee), callback);
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}
|
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|
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var eachOfLimit$1 = awaitify(eachOfLimit, 4);
|
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|
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// eachOf implementation optimized for array-likes
|
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function eachOfArrayLike(coll, iteratee, callback) {
|
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callback = once(callback);
|
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var index = 0,
|
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completed = 0,
|
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{length} = coll,
|
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canceled = false;
|
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if (length === 0) {
|
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callback(null);
|
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}
|
|
|
|
function iteratorCallback(err, value) {
|
|
if (err === false) {
|
|
canceled = true;
|
|
}
|
|
if (canceled === true) return
|
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if (err) {
|
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callback(err);
|
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} else if ((++completed === length) || value === breakLoop) {
|
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callback(null);
|
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}
|
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}
|
|
|
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for (; index < length; index++) {
|
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iteratee(coll[index], index, onlyOnce(iteratorCallback));
|
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}
|
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}
|
|
|
|
// a generic version of eachOf which can handle array, object, and iterator cases.
|
|
function eachOfGeneric (coll, iteratee, callback) {
|
|
return eachOfLimit$1(coll, Infinity, iteratee, callback);
|
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}
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if a callback is omitted
|
|
* @example
|
|
*
|
|
* // dev.json is a file containing a valid json object config for dev environment
|
|
* // dev.json is a file containing a valid json object config for test environment
|
|
* // prod.json is a file containing a valid json object config for prod environment
|
|
* // invalid.json is a file with a malformed json object
|
|
*
|
|
* let configs = {}; //global variable
|
|
* let validConfigFileMap = {dev: 'dev.json', test: 'test.json', prod: 'prod.json'};
|
|
* let invalidConfigFileMap = {dev: 'dev.json', test: 'test.json', invalid: 'invalid.json'};
|
|
*
|
|
* // asynchronous function that reads a json file and parses the contents as json object
|
|
* function parseFile(file, key, callback) {
|
|
* fs.readFile(file, "utf8", function(err, data) {
|
|
* if (err) return calback(err);
|
|
* try {
|
|
* configs[key] = JSON.parse(data);
|
|
* } catch (e) {
|
|
* return callback(e);
|
|
* }
|
|
* callback();
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.forEachOf(validConfigFileMap, parseFile, function (err) {
|
|
* if (err) {
|
|
* console.error(err);
|
|
* } else {
|
|
* console.log(configs);
|
|
* // configs is now a map of JSON data, e.g.
|
|
* // { dev: //parsed dev.json, test: //parsed test.json, prod: //parsed prod.json}
|
|
* }
|
|
* });
|
|
*
|
|
* //Error handing
|
|
* async.forEachOf(invalidConfigFileMap, parseFile, function (err) {
|
|
* if (err) {
|
|
* console.error(err);
|
|
* // JSON parse error exception
|
|
* } else {
|
|
* console.log(configs);
|
|
* }
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.forEachOf(validConfigFileMap, parseFile)
|
|
* .then( () => {
|
|
* console.log(configs);
|
|
* // configs is now a map of JSON data, e.g.
|
|
* // { dev: //parsed dev.json, test: //parsed test.json, prod: //parsed prod.json}
|
|
* }).catch( err => {
|
|
* console.error(err);
|
|
* });
|
|
*
|
|
* //Error handing
|
|
* async.forEachOf(invalidConfigFileMap, parseFile)
|
|
* .then( () => {
|
|
* console.log(configs);
|
|
* }).catch( err => {
|
|
* console.error(err);
|
|
* // JSON parse error exception
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.forEachOf(validConfigFileMap, parseFile);
|
|
* console.log(configs);
|
|
* // configs is now a map of JSON data, e.g.
|
|
* // { dev: //parsed dev.json, test: //parsed test.json, prod: //parsed prod.json}
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
* //Error handing
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.forEachOf(invalidConfigFileMap, parseFile);
|
|
* console.log(configs);
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* // JSON parse error exception
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function eachOf(coll, iteratee, callback) {
|
|
var eachOfImplementation = isArrayLike(coll) ? eachOfArrayLike : eachOfGeneric;
|
|
return eachOfImplementation(coll, wrapAsync(iteratee), callback);
|
|
}
|
|
|
|
var eachOf$1 = awaitify(eachOf, 3);
|
|
|
|
/**
|
|
* 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 callbacks
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
* @example
|
|
*
|
|
* // file1.txt is a file that is 1000 bytes in size
|
|
* // file2.txt is a file that is 2000 bytes in size
|
|
* // file3.txt is a file that is 3000 bytes in size
|
|
* // file4.txt does not exist
|
|
*
|
|
* const fileList = ['file1.txt','file2.txt','file3.txt'];
|
|
* const withMissingFileList = ['file1.txt','file2.txt','file4.txt'];
|
|
*
|
|
* // asynchronous function that returns the file size in bytes
|
|
* function getFileSizeInBytes(file, callback) {
|
|
* fs.stat(file, function(err, stat) {
|
|
* if (err) {
|
|
* return callback(err);
|
|
* }
|
|
* callback(null, stat.size);
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.map(fileList, getFileSizeInBytes, function(err, results) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(results);
|
|
* // results is now an array of the file size in bytes for each file, e.g.
|
|
* // [ 1000, 2000, 3000]
|
|
* }
|
|
* });
|
|
*
|
|
* // Error Handling
|
|
* async.map(withMissingFileList, getFileSizeInBytes, function(err, results) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* } else {
|
|
* console.log(results);
|
|
* }
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.map(fileList, getFileSizeInBytes)
|
|
* .then( results => {
|
|
* console.log(results);
|
|
* // results is now an array of the file size in bytes for each file, e.g.
|
|
* // [ 1000, 2000, 3000]
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Error Handling
|
|
* async.map(withMissingFileList, getFileSizeInBytes)
|
|
* .then( results => {
|
|
* console.log(results);
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.map(fileList, getFileSizeInBytes);
|
|
* console.log(results);
|
|
* // results is now an array of the file size in bytes for each file, e.g.
|
|
* // [ 1000, 2000, 3000]
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
* // Error Handling
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.map(withMissingFileList, getFileSizeInBytes);
|
|
* console.log(results);
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function map (coll, iteratee, callback) {
|
|
return _asyncMap(eachOf$1, coll, iteratee, callback)
|
|
}
|
|
var map$1 = awaitify(map, 3);
|
|
|
|
/**
|
|
* 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. The results
|
|
* for each of the applied async functions are passed to the final callback
|
|
* as an array.
|
|
*
|
|
* @name applyEach
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @category Control Flow
|
|
* @param {Array|Iterable|AsyncIterable|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 {AsyncFunction} - Returns a function that takes no args other than
|
|
* an optional callback, that is the result of applying the `args` to each
|
|
* of the functions.
|
|
* @example
|
|
*
|
|
* const appliedFn = async.applyEach([enableSearch, updateSchema], 'bucket')
|
|
*
|
|
* appliedFn((err, results) => {
|
|
* // results[0] is the results for `enableSearch`
|
|
* // results[1] is the results for `updateSchema`
|
|
* });
|
|
*
|
|
* // partial application example:
|
|
* async.each(
|
|
* buckets,
|
|
* async (bucket) => async.applyEach([enableSearch, updateSchema], bucket)(),
|
|
* callback
|
|
* );
|
|
*/
|
|
var applyEach = applyEach$1(map$1);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if a callback is omitted
|
|
*/
|
|
function eachOfSeries(coll, iteratee, callback) {
|
|
return eachOfLimit$1(coll, 1, iteratee, callback)
|
|
}
|
|
var eachOfSeries$1 = awaitify(eachOfSeries, 3);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function mapSeries (coll, iteratee, callback) {
|
|
return _asyncMap(eachOfSeries$1, coll, iteratee, callback)
|
|
}
|
|
var mapSeries$1 = awaitify(mapSeries, 3);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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 {AsyncFunction} - A function, that when called, is the result of
|
|
* appling the `args` to the list of functions. It takes no args, other than
|
|
* a callback.
|
|
*/
|
|
var applyEachSeries = applyEach$1(mapSeries$1);
|
|
|
|
const PROMISE_SYMBOL = Symbol('promiseCallback');
|
|
|
|
function promiseCallback () {
|
|
let resolve, reject;
|
|
function callback (err, ...args) {
|
|
if (err) return reject(err)
|
|
resolve(args.length > 1 ? args : args[0]);
|
|
}
|
|
|
|
callback[PROMISE_SYMBOL] = new Promise((res, rej) => {
|
|
resolve = res,
|
|
reject = rej;
|
|
});
|
|
|
|
return callback
|
|
}
|
|
|
|
/**
|
|
* 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 {Promise} a promise, if a callback is not passed
|
|
* @example
|
|
*
|
|
* //Using Callbacks
|
|
* async.auto({
|
|
* 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: ['get_data', 'make_folder', function(results, callback) {
|
|
* // 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) {
|
|
* // once the file is written let's email a link to it...
|
|
* callback(null, {'file':results.write_file, 'email':'user@example.com'});
|
|
* }]
|
|
* }, function(err, results) {
|
|
* if (err) {
|
|
* console.log('err = ', err);
|
|
* }
|
|
* console.log('results = ', results);
|
|
* // results = {
|
|
* // get_data: ['data', 'converted to array']
|
|
* // make_folder; 'folder',
|
|
* // write_file: 'filename'
|
|
* // email_link: { file: 'filename', email: 'user@example.com' }
|
|
* // }
|
|
* });
|
|
*
|
|
* //Using Promises
|
|
* 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) {
|
|
* // 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) {
|
|
* // once the file is written let's email a link to it...
|
|
* callback(null, {'file':results.write_file, 'email':'user@example.com'});
|
|
* }]
|
|
* }).then(results => {
|
|
* console.log('results = ', results);
|
|
* // results = {
|
|
* // get_data: ['data', 'converted to array']
|
|
* // make_folder; 'folder',
|
|
* // write_file: 'filename'
|
|
* // email_link: { file: 'filename', email: 'user@example.com' }
|
|
* // }
|
|
* }).catch(err => {
|
|
* console.log('err = ', err);
|
|
* });
|
|
*
|
|
* //Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.auto({
|
|
* 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: ['get_data', 'make_folder', function(results, callback) {
|
|
* // 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) {
|
|
* // once the file is written let's email a link to it...
|
|
* callback(null, {'file':results.write_file, 'email':'user@example.com'});
|
|
* }]
|
|
* });
|
|
* console.log('results = ', results);
|
|
* // results = {
|
|
* // get_data: ['data', 'converted to array']
|
|
* // make_folder; 'folder',
|
|
* // write_file: 'filename'
|
|
* // email_link: { file: 'filename', email: 'user@example.com' }
|
|
* // }
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function auto(tasks, concurrency, callback) {
|
|
if (typeof concurrency !== 'number') {
|
|
// concurrency is optional, shift the args.
|
|
callback = concurrency;
|
|
concurrency = null;
|
|
}
|
|
callback = once(callback || promiseCallback());
|
|
var numTasks = Object.keys(tasks).length;
|
|
if (!numTasks) {
|
|
return callback(null);
|
|
}
|
|
if (!concurrency) {
|
|
concurrency = numTasks;
|
|
}
|
|
|
|
var results = {};
|
|
var runningTasks = 0;
|
|
var canceled = false;
|
|
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 = {};
|
|
|
|
Object.keys(tasks).forEach(key => {
|
|
var task = tasks[key];
|
|
if (!Array.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;
|
|
|
|
dependencies.forEach(dependencyName => {
|
|
if (!tasks[dependencyName]) {
|
|
throw new Error('async.auto task `' + key +
|
|
'` has a non-existent dependency `' +
|
|
dependencyName + '` in ' +
|
|
dependencies.join(', '));
|
|
}
|
|
addListener(dependencyName, () => {
|
|
remainingDependencies--;
|
|
if (remainingDependencies === 0) {
|
|
enqueueTask(key, task);
|
|
}
|
|
});
|
|
});
|
|
});
|
|
|
|
checkForDeadlocks();
|
|
processQueue();
|
|
|
|
function enqueueTask(key, task) {
|
|
readyTasks.push(() => runTask(key, task));
|
|
}
|
|
|
|
function processQueue() {
|
|
if (canceled) return
|
|
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] || [];
|
|
taskListeners.forEach(fn => fn());
|
|
processQueue();
|
|
}
|
|
|
|
|
|
function runTask(key, task) {
|
|
if (hasError) return;
|
|
|
|
var taskCallback = onlyOnce((err, ...result) => {
|
|
runningTasks--;
|
|
if (err === false) {
|
|
canceled = true;
|
|
return
|
|
}
|
|
if (result.length < 2) {
|
|
[result] = result;
|
|
}
|
|
if (err) {
|
|
var safeResults = {};
|
|
Object.keys(results).forEach(rkey => {
|
|
safeResults[rkey] = results[rkey];
|
|
});
|
|
safeResults[key] = result;
|
|
hasError = true;
|
|
listeners = Object.create(null);
|
|
if (canceled) return
|
|
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++;
|
|
getDependents(currentTask).forEach(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 = [];
|
|
Object.keys(tasks).forEach(key => {
|
|
const task = tasks[key];
|
|
if (Array.isArray(task) && task.indexOf(taskName) >= 0) {
|
|
result.push(key);
|
|
}
|
|
});
|
|
return result;
|
|
}
|
|
|
|
return callback[PROMISE_SYMBOL]
|
|
}
|
|
|
|
var FN_ARGS = /^(?:async\s)?(?:function)?\s*(?:\w+\s*)?\(([^)]+)\)(?:\s*{)/;
|
|
var ARROW_FN_ARGS = /^(?:async\s)?\s*(?:\(\s*)?((?:[^)=\s]\s*)*)(?:\)\s*)?=>/;
|
|
var FN_ARG_SPLIT = /,/;
|
|
var FN_ARG = /(=.+)?(\s*)$/;
|
|
|
|
function stripComments(string) {
|
|
let stripped = '';
|
|
let index = 0;
|
|
let endBlockComment = string.indexOf('*/');
|
|
while (index < string.length) {
|
|
if (string[index] === '/' && string[index+1] === '/') {
|
|
// inline comment
|
|
let endIndex = string.indexOf('\n', index);
|
|
index = (endIndex === -1) ? string.length : endIndex;
|
|
} else if ((endBlockComment !== -1) && (string[index] === '/') && (string[index+1] === '*')) {
|
|
// block comment
|
|
let endIndex = string.indexOf('*/', index);
|
|
if (endIndex !== -1) {
|
|
index = endIndex + 2;
|
|
endBlockComment = string.indexOf('*/', index);
|
|
} else {
|
|
stripped += string[index];
|
|
index++;
|
|
}
|
|
} else {
|
|
stripped += string[index];
|
|
index++;
|
|
}
|
|
}
|
|
return stripped;
|
|
}
|
|
|
|
function parseParams(func) {
|
|
const src = stripComments(func.toString());
|
|
let match = src.match(FN_ARGS);
|
|
if (!match) {
|
|
match = src.match(ARROW_FN_ARGS);
|
|
}
|
|
if (!match) throw new Error('could not parse args in autoInject\nSource:\n' + src)
|
|
let [, args] = match;
|
|
return args
|
|
.replace(/\s/g, '')
|
|
.split(FN_ARG_SPLIT)
|
|
.map((arg) => arg.replace(FN_ARG, '').trim());
|
|
}
|
|
|
|
/**
|
|
* 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`.
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
* @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 = {};
|
|
|
|
Object.keys(tasks).forEach(key => {
|
|
var taskFn = tasks[key];
|
|
var params;
|
|
var fnIsAsync = isAsync(taskFn);
|
|
var hasNoDeps =
|
|
(!fnIsAsync && taskFn.length === 1) ||
|
|
(fnIsAsync && taskFn.length === 0);
|
|
|
|
if (Array.isArray(taskFn)) {
|
|
params = [...taskFn];
|
|
taskFn = params.pop();
|
|
|
|
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 = params.map(name => results[name]);
|
|
newArgs.push(taskCb);
|
|
wrapAsync(taskFn)(...newArgs);
|
|
}
|
|
});
|
|
|
|
return 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.
|
|
class DLL {
|
|
constructor() {
|
|
this.head = this.tail = null;
|
|
this.length = 0;
|
|
}
|
|
|
|
removeLink(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;
|
|
}
|
|
|
|
empty () {
|
|
while(this.head) this.shift();
|
|
return this;
|
|
}
|
|
|
|
insertAfter(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;
|
|
}
|
|
|
|
insertBefore(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;
|
|
}
|
|
|
|
unshift(node) {
|
|
if (this.head) this.insertBefore(this.head, node);
|
|
else setInitial(this, node);
|
|
}
|
|
|
|
push(node) {
|
|
if (this.tail) this.insertAfter(this.tail, node);
|
|
else setInitial(this, node);
|
|
}
|
|
|
|
shift() {
|
|
return this.head && this.removeLink(this.head);
|
|
}
|
|
|
|
pop() {
|
|
return this.tail && this.removeLink(this.tail);
|
|
}
|
|
|
|
toArray() {
|
|
return [...this]
|
|
}
|
|
|
|
*[Symbol.iterator] () {
|
|
var cur = this.head;
|
|
while (cur) {
|
|
yield cur.data;
|
|
cur = cur.next;
|
|
}
|
|
}
|
|
|
|
remove (testFn) {
|
|
var curr = this.head;
|
|
while(curr) {
|
|
var {next} = curr;
|
|
if (testFn(curr)) {
|
|
this.removeLink(curr);
|
|
}
|
|
curr = next;
|
|
}
|
|
return this;
|
|
}
|
|
}
|
|
|
|
function setInitial(dll, node) {
|
|
dll.length = 1;
|
|
dll.head = dll.tail = node;
|
|
}
|
|
|
|
function queue$1(worker, concurrency, payload) {
|
|
if (concurrency == null) {
|
|
concurrency = 1;
|
|
}
|
|
else if(concurrency === 0) {
|
|
throw new RangeError('Concurrency must not be zero');
|
|
}
|
|
|
|
var _worker = wrapAsync(worker);
|
|
var numRunning = 0;
|
|
var workersList = [];
|
|
const events = {
|
|
error: [],
|
|
drain: [],
|
|
saturated: [],
|
|
unsaturated: [],
|
|
empty: []
|
|
};
|
|
|
|
function on (event, handler) {
|
|
events[event].push(handler);
|
|
}
|
|
|
|
function once (event, handler) {
|
|
const handleAndRemove = (...args) => {
|
|
off(event, handleAndRemove);
|
|
handler(...args);
|
|
};
|
|
events[event].push(handleAndRemove);
|
|
}
|
|
|
|
function off (event, handler) {
|
|
if (!event) return Object.keys(events).forEach(ev => events[ev] = [])
|
|
if (!handler) return events[event] = []
|
|
events[event] = events[event].filter(ev => ev !== handler);
|
|
}
|
|
|
|
function trigger (event, ...args) {
|
|
events[event].forEach(handler => handler(...args));
|
|
}
|
|
|
|
var processingScheduled = false;
|
|
function _insert(data, insertAtFront, rejectOnError, callback) {
|
|
if (callback != null && typeof callback !== 'function') {
|
|
throw new Error('task callback must be a function');
|
|
}
|
|
q.started = true;
|
|
|
|
var res, rej;
|
|
function promiseCallback (err, ...args) {
|
|
// we don't care about the error, let the global error handler
|
|
// deal with it
|
|
if (err) return rejectOnError ? rej(err) : res()
|
|
if (args.length <= 1) return res(args[0])
|
|
res(args);
|
|
}
|
|
|
|
var item = q._createTaskItem(
|
|
data,
|
|
rejectOnError ? promiseCallback :
|
|
(callback || promiseCallback)
|
|
);
|
|
|
|
if (insertAtFront) {
|
|
q._tasks.unshift(item);
|
|
} else {
|
|
q._tasks.push(item);
|
|
}
|
|
|
|
if (!processingScheduled) {
|
|
processingScheduled = true;
|
|
setImmediate$1(() => {
|
|
processingScheduled = false;
|
|
q.process();
|
|
});
|
|
}
|
|
|
|
if (rejectOnError || !callback) {
|
|
return new Promise((resolve, reject) => {
|
|
res = resolve;
|
|
rej = reject;
|
|
})
|
|
}
|
|
}
|
|
|
|
function _createCB(tasks) {
|
|
return function (err, ...args) {
|
|
numRunning -= 1;
|
|
|
|
for (var i = 0, l = tasks.length; i < l; i++) {
|
|
var task = tasks[i];
|
|
|
|
var index = workersList.indexOf(task);
|
|
if (index === 0) {
|
|
workersList.shift();
|
|
} else if (index > 0) {
|
|
workersList.splice(index, 1);
|
|
}
|
|
|
|
task.callback(err, ...args);
|
|
|
|
if (err != null) {
|
|
trigger('error', err, task.data);
|
|
}
|
|
}
|
|
|
|
if (numRunning <= (q.concurrency - q.buffer) ) {
|
|
trigger('unsaturated');
|
|
}
|
|
|
|
if (q.idle()) {
|
|
trigger('drain');
|
|
}
|
|
q.process();
|
|
};
|
|
}
|
|
|
|
function _maybeDrain(data) {
|
|
if (data.length === 0 && q.idle()) {
|
|
// call drain immediately if there are no tasks
|
|
setImmediate$1(() => trigger('drain'));
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
const eventMethod = (name) => (handler) => {
|
|
if (!handler) {
|
|
return new Promise((resolve, reject) => {
|
|
once(name, (err, data) => {
|
|
if (err) return reject(err)
|
|
resolve(data);
|
|
});
|
|
})
|
|
}
|
|
off(name);
|
|
on(name, handler);
|
|
|
|
};
|
|
|
|
var isProcessing = false;
|
|
var q = {
|
|
_tasks: new DLL(),
|
|
_createTaskItem (data, callback) {
|
|
return {
|
|
data,
|
|
callback
|
|
};
|
|
},
|
|
*[Symbol.iterator] () {
|
|
yield* q._tasks[Symbol.iterator]();
|
|
},
|
|
concurrency,
|
|
payload,
|
|
buffer: concurrency / 4,
|
|
started: false,
|
|
paused: false,
|
|
push (data, callback) {
|
|
if (Array.isArray(data)) {
|
|
if (_maybeDrain(data)) return
|
|
return data.map(datum => _insert(datum, false, false, callback))
|
|
}
|
|
return _insert(data, false, false, callback);
|
|
},
|
|
pushAsync (data, callback) {
|
|
if (Array.isArray(data)) {
|
|
if (_maybeDrain(data)) return
|
|
return data.map(datum => _insert(datum, false, true, callback))
|
|
}
|
|
return _insert(data, false, true, callback);
|
|
},
|
|
kill () {
|
|
off();
|
|
q._tasks.empty();
|
|
},
|
|
unshift (data, callback) {
|
|
if (Array.isArray(data)) {
|
|
if (_maybeDrain(data)) return
|
|
return data.map(datum => _insert(datum, true, false, callback))
|
|
}
|
|
return _insert(data, true, false, callback);
|
|
},
|
|
unshiftAsync (data, callback) {
|
|
if (Array.isArray(data)) {
|
|
if (_maybeDrain(data)) return
|
|
return data.map(datum => _insert(datum, true, true, callback))
|
|
}
|
|
return _insert(data, true, true, callback);
|
|
},
|
|
remove (testFn) {
|
|
q._tasks.remove(testFn);
|
|
},
|
|
process () {
|
|
// 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) {
|
|
trigger('empty');
|
|
}
|
|
|
|
if (numRunning === q.concurrency) {
|
|
trigger('saturated');
|
|
}
|
|
|
|
var cb = onlyOnce(_createCB(tasks));
|
|
_worker(data, cb);
|
|
}
|
|
isProcessing = false;
|
|
},
|
|
length () {
|
|
return q._tasks.length;
|
|
},
|
|
running () {
|
|
return numRunning;
|
|
},
|
|
workersList () {
|
|
return workersList;
|
|
},
|
|
idle() {
|
|
return q._tasks.length + numRunning === 0;
|
|
},
|
|
pause () {
|
|
q.paused = true;
|
|
},
|
|
resume () {
|
|
if (q.paused === false) { return; }
|
|
q.paused = false;
|
|
setImmediate$1(q.process);
|
|
}
|
|
};
|
|
// define these as fixed properties, so people get useful errors when updating
|
|
Object.defineProperties(q, {
|
|
saturated: {
|
|
writable: false,
|
|
value: eventMethod('saturated')
|
|
},
|
|
unsaturated: {
|
|
writable: false,
|
|
value: eventMethod('unsaturated')
|
|
},
|
|
empty: {
|
|
writable: false,
|
|
value: eventMethod('empty')
|
|
},
|
|
drain: {
|
|
writable: false,
|
|
value: eventMethod('drain')
|
|
},
|
|
error: {
|
|
writable: false,
|
|
value: eventMethod('error')
|
|
},
|
|
});
|
|
return q;
|
|
}
|
|
|
|
/**
|
|
* 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.QueueObject} 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');
|
|
* });
|
|
* await cargo.push({name: 'baz'});
|
|
* console.log('finished processing baz');
|
|
*/
|
|
function cargo$1(worker, payload) {
|
|
return queue$1(worker, 1, payload);
|
|
}
|
|
|
|
/**
|
|
* Creates a `cargoQueue` object with the specified payload. Tasks added to the
|
|
* cargoQueue will be processed together (up to the `payload` limit) in `concurrency` parallel workers.
|
|
* If the all `workers` are in progress, the task is queued until one becomes available. Once
|
|
* a `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, and [`cargo`]{@link module:ControlFlow.cargo} passes an array of tasks to a single worker,
|
|
* the cargoQueue passes an array of tasks to multiple parallel workers.
|
|
*
|
|
* @name cargoQueue
|
|
* @static
|
|
* @memberOf module:ControlFlow
|
|
* @method
|
|
* @see [async.queue]{@link module:ControlFlow.queue}
|
|
* @see [async.cargo]{@link module:ControlFLow.cargo}
|
|
* @category Control Flow
|
|
* @param {AsyncFunction} worker - An asynchronous function for processing an array
|
|
* of queued tasks. Invoked with `(tasks, 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.
|
|
* @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.QueueObject} A cargoQueue object to manage the tasks. Callbacks can
|
|
* attached as certain properties to listen for specific events during the
|
|
* lifecycle of the cargoQueue and inner queue.
|
|
* @example
|
|
*
|
|
* // create a cargoQueue object with payload 2 and concurrency 2
|
|
* var cargoQueue = async.cargoQueue(function(tasks, callback) {
|
|
* for (var i=0; i<tasks.length; i++) {
|
|
* console.log('hello ' + tasks[i].name);
|
|
* }
|
|
* callback();
|
|
* }, 2, 2);
|
|
*
|
|
* // add some items
|
|
* cargoQueue.push({name: 'foo'}, function(err) {
|
|
* console.log('finished processing foo');
|
|
* });
|
|
* cargoQueue.push({name: 'bar'}, function(err) {
|
|
* console.log('finished processing bar');
|
|
* });
|
|
* cargoQueue.push({name: 'baz'}, function(err) {
|
|
* console.log('finished processing baz');
|
|
* });
|
|
* cargoQueue.push({name: 'boo'}, function(err) {
|
|
* console.log('finished processing boo');
|
|
* });
|
|
*/
|
|
function cargo(worker, concurrency, payload) {
|
|
return queue$1(worker, concurrency, payload);
|
|
}
|
|
|
|
/**
|
|
* 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|AsyncIterable|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 completes 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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
* @example
|
|
*
|
|
* // file1.txt is a file that is 1000 bytes in size
|
|
* // file2.txt is a file that is 2000 bytes in size
|
|
* // file3.txt is a file that is 3000 bytes in size
|
|
* // file4.txt does not exist
|
|
*
|
|
* const fileList = ['file1.txt','file2.txt','file3.txt'];
|
|
* const withMissingFileList = ['file1.txt','file2.txt','file3.txt', 'file4.txt'];
|
|
*
|
|
* // asynchronous function that computes the file size in bytes
|
|
* // file size is added to the memoized value, then returned
|
|
* function getFileSizeInBytes(memo, file, callback) {
|
|
* fs.stat(file, function(err, stat) {
|
|
* if (err) {
|
|
* return callback(err);
|
|
* }
|
|
* callback(null, memo + stat.size);
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.reduce(fileList, 0, getFileSizeInBytes, function(err, result) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(result);
|
|
* // 6000
|
|
* // which is the sum of the file sizes of the three files
|
|
* }
|
|
* });
|
|
*
|
|
* // Error Handling
|
|
* async.reduce(withMissingFileList, 0, getFileSizeInBytes, function(err, result) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* } else {
|
|
* console.log(result);
|
|
* }
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.reduce(fileList, 0, getFileSizeInBytes)
|
|
* .then( result => {
|
|
* console.log(result);
|
|
* // 6000
|
|
* // which is the sum of the file sizes of the three files
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Error Handling
|
|
* async.reduce(withMissingFileList, 0, getFileSizeInBytes)
|
|
* .then( result => {
|
|
* console.log(result);
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.reduce(fileList, 0, getFileSizeInBytes);
|
|
* console.log(result);
|
|
* // 6000
|
|
* // which is the sum of the file sizes of the three files
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
* // Error Handling
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.reduce(withMissingFileList, 0, getFileSizeInBytes);
|
|
* console.log(result);
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function reduce(coll, memo, iteratee, callback) {
|
|
callback = once(callback);
|
|
var _iteratee = wrapAsync(iteratee);
|
|
return eachOfSeries$1(coll, (x, i, iterCb) => {
|
|
_iteratee(memo, x, (err, v) => {
|
|
memo = v;
|
|
iterCb(err);
|
|
});
|
|
}, err => callback(err, memo));
|
|
}
|
|
var reduce$1 = awaitify(reduce, 4);
|
|
|
|
/**
|
|
* 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(
|
|
* User.get.bind(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 = functions.map(wrapAsync);
|
|
return function (...args) {
|
|
var that = this;
|
|
|
|
var cb = args[args.length - 1];
|
|
if (typeof cb == 'function') {
|
|
args.pop();
|
|
} else {
|
|
cb = promiseCallback();
|
|
}
|
|
|
|
reduce$1(_functions, args, (newargs, fn, iterCb) => {
|
|
fn.apply(that, newargs.concat((err, ...nextargs) => {
|
|
iterCb(err, nextargs);
|
|
}));
|
|
},
|
|
(err, results) => cb(err, ...results));
|
|
|
|
return cb[PROMISE_SYMBOL]
|
|
};
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* If the last argument to the composed function is not a function, a promise
|
|
* is returned when you call it.
|
|
*
|
|
* 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
|
|
* });
|
|
*/
|
|
function compose(...args) {
|
|
return seq(...args.reverse());
|
|
}
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function mapLimit (coll, limit, iteratee, callback) {
|
|
return _asyncMap(eachOfLimit$2(limit), coll, iteratee, callback)
|
|
}
|
|
var mapLimit$1 = awaitify(mapLimit, 4);
|
|
|
|
/**
|
|
* 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
|
|
* @alias flatMapLimit
|
|
* @param {Array|Iterable|AsyncIterable|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).
|
|
* @returns A Promise, if no callback is passed
|
|
*/
|
|
function concatLimit(coll, limit, iteratee, callback) {
|
|
var _iteratee = wrapAsync(iteratee);
|
|
return mapLimit$1(coll, limit, (val, iterCb) => {
|
|
_iteratee(val, (err, ...args) => {
|
|
if (err) return iterCb(err);
|
|
return iterCb(err, args);
|
|
});
|
|
}, (err, mapResults) => {
|
|
var result = [];
|
|
for (var i = 0; i < mapResults.length; i++) {
|
|
if (mapResults[i]) {
|
|
result = result.concat(...mapResults[i]);
|
|
}
|
|
}
|
|
|
|
return callback(err, result);
|
|
});
|
|
}
|
|
var concatLimit$1 = awaitify(concatLimit, 4);
|
|
|
|
/**
|
|
* 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. 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
|
|
* @alias flatMap
|
|
* @param {Array|Iterable|AsyncIterable|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] - 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).
|
|
* @returns A Promise, if no callback is passed
|
|
* @example
|
|
*
|
|
* // dir1 is a directory that contains file1.txt, file2.txt
|
|
* // dir2 is a directory that contains file3.txt, file4.txt
|
|
* // dir3 is a directory that contains file5.txt
|
|
* // dir4 does not exist
|
|
*
|
|
* let directoryList = ['dir1','dir2','dir3'];
|
|
* let withMissingDirectoryList = ['dir1','dir2','dir3', 'dir4'];
|
|
*
|
|
* // Using callbacks
|
|
* async.concat(directoryList, fs.readdir, function(err, results) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(results);
|
|
* // [ 'file1.txt', 'file2.txt', 'file3.txt', 'file4.txt', file5.txt ]
|
|
* }
|
|
* });
|
|
*
|
|
* // Error Handling
|
|
* async.concat(withMissingDirectoryList, fs.readdir, function(err, results) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* // since dir4 does not exist
|
|
* } else {
|
|
* console.log(results);
|
|
* }
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.concat(directoryList, fs.readdir)
|
|
* .then(results => {
|
|
* console.log(results);
|
|
* // [ 'file1.txt', 'file2.txt', 'file3.txt', 'file4.txt', file5.txt ]
|
|
* }).catch(err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Error Handling
|
|
* async.concat(withMissingDirectoryList, fs.readdir)
|
|
* .then(results => {
|
|
* console.log(results);
|
|
* }).catch(err => {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* // since dir4 does not exist
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.concat(directoryList, fs.readdir);
|
|
* console.log(results);
|
|
* // [ 'file1.txt', 'file2.txt', 'file3.txt', 'file4.txt', file5.txt ]
|
|
* } catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
* // Error Handling
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.concat(withMissingDirectoryList, fs.readdir);
|
|
* console.log(results);
|
|
* } catch (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* // since dir4 does not exist
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function concat(coll, iteratee, callback) {
|
|
return concatLimit$1(coll, Infinity, iteratee, callback)
|
|
}
|
|
var concat$1 = awaitify(concat, 3);
|
|
|
|
/**
|
|
* 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
|
|
* @alias flatMapSeries
|
|
* @param {Array|Iterable|AsyncIterable|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] - 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).
|
|
* @returns A Promise, if no callback is passed
|
|
*/
|
|
function concatSeries(coll, iteratee, callback) {
|
|
return concatLimit$1(coll, 1, iteratee, callback)
|
|
}
|
|
var concatSeries$1 = awaitify(concatSeries, 3);
|
|
|
|
/**
|
|
* 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);
|
|
*/
|
|
function constant$1(...args) {
|
|
return function (...ignoredArgs/*, callback*/) {
|
|
var callback = ignoredArgs.pop();
|
|
return callback(null, ...args);
|
|
};
|
|
}
|
|
|
|
function _createTester(check, getResult) {
|
|
return (eachfn, arr, _iteratee, cb) => {
|
|
var testPassed = false;
|
|
var testResult;
|
|
const iteratee = wrapAsync(_iteratee);
|
|
eachfn(arr, (value, _, callback) => {
|
|
iteratee(value, (err, result) => {
|
|
if (err || err === false) return callback(err);
|
|
|
|
if (check(result) && !testResult) {
|
|
testPassed = true;
|
|
testResult = getResult(true, value);
|
|
return callback(null, breakLoop);
|
|
}
|
|
callback();
|
|
});
|
|
}, err => {
|
|
if (err) return cb(err);
|
|
cb(null, testPassed ? testResult : getResult(false));
|
|
});
|
|
};
|
|
}
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if a callback is omitted
|
|
* @example
|
|
*
|
|
* // dir1 is a directory that contains file1.txt, file2.txt
|
|
* // dir2 is a directory that contains file3.txt, file4.txt
|
|
* // dir3 is a directory that contains file5.txt
|
|
*
|
|
* // asynchronous function that checks if a file exists
|
|
* function fileExists(file, callback) {
|
|
* fs.access(file, fs.constants.F_OK, (err) => {
|
|
* callback(null, !err);
|
|
* });
|
|
* }
|
|
*
|
|
* async.detect(['file3.txt','file2.txt','dir1/file1.txt'], fileExists,
|
|
* function(err, result) {
|
|
* console.log(result);
|
|
* // dir1/file1.txt
|
|
* // result now equals the first file in the list that exists
|
|
* }
|
|
*);
|
|
*
|
|
* // Using Promises
|
|
* async.detect(['file3.txt','file2.txt','dir1/file1.txt'], fileExists)
|
|
* .then(result => {
|
|
* console.log(result);
|
|
* // dir1/file1.txt
|
|
* // result now equals the first file in the list that exists
|
|
* }).catch(err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.detect(['file3.txt','file2.txt','dir1/file1.txt'], fileExists);
|
|
* console.log(result);
|
|
* // dir1/file1.txt
|
|
* // result now equals the file in the list that exists
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function detect(coll, iteratee, callback) {
|
|
return _createTester(bool => bool, (res, item) => item)(eachOf$1, coll, iteratee, callback)
|
|
}
|
|
var detect$1 = awaitify(detect, 3);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if a callback is omitted
|
|
*/
|
|
function detectLimit(coll, limit, iteratee, callback) {
|
|
return _createTester(bool => bool, (res, item) => item)(eachOfLimit$2(limit), coll, iteratee, callback)
|
|
}
|
|
var detectLimit$1 = awaitify(detectLimit, 4);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if a callback is omitted
|
|
*/
|
|
function detectSeries(coll, iteratee, callback) {
|
|
return _createTester(bool => bool, (res, item) => item)(eachOfLimit$2(1), coll, iteratee, callback)
|
|
}
|
|
|
|
var detectSeries$1 = awaitify(detectSeries, 3);
|
|
|
|
function consoleFunc(name) {
|
|
return (fn, ...args) => wrapAsync(fn)(...args, (err, ...resultArgs) => {
|
|
/* istanbul ignore else */
|
|
if (typeof console === 'object') {
|
|
/* istanbul ignore else */
|
|
if (err) {
|
|
/* istanbul ignore else */
|
|
if (console.error) {
|
|
console.error(err);
|
|
}
|
|
} else if (console[name]) { /* istanbul ignore else */
|
|
resultArgs.forEach(x => console[name](x));
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
/**
|
|
* 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 [`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 {AsyncFunction} test - asynchronous truth test to perform after each
|
|
* execution of `iteratee`. Invoked with (...args, callback), where `...args` are the
|
|
* non-error args from the previous callback 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]);
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function doWhilst(iteratee, test, callback) {
|
|
callback = onlyOnce(callback);
|
|
var _fn = wrapAsync(iteratee);
|
|
var _test = wrapAsync(test);
|
|
var results;
|
|
|
|
function next(err, ...args) {
|
|
if (err) return callback(err);
|
|
if (err === false) return;
|
|
results = args;
|
|
_test(...args, check);
|
|
}
|
|
|
|
function check(err, truth) {
|
|
if (err) return callback(err);
|
|
if (err === false) return;
|
|
if (!truth) return callback(null, ...results);
|
|
_fn(next);
|
|
}
|
|
|
|
return check(null, true);
|
|
}
|
|
|
|
var doWhilst$1 = awaitify(doWhilst, 3);
|
|
|
|
/**
|
|
* 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 {AsyncFunction} test - asynchronous truth test to perform after each
|
|
* execution of `iteratee`. Invoked with (...args, callback), where `...args` are the
|
|
* non-error args from the previous callback 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]);
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function doUntil(iteratee, test, callback) {
|
|
const _test = wrapAsync(test);
|
|
return doWhilst$1(iteratee, (...args) => {
|
|
const cb = args.pop();
|
|
_test(...args, (err, truth) => cb (err, !truth));
|
|
}, callback);
|
|
}
|
|
|
|
function _withoutIndex(iteratee) {
|
|
return (value, index, callback) => 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if a callback is omitted
|
|
* @example
|
|
*
|
|
* // dir1 is a directory that contains file1.txt, file2.txt
|
|
* // dir2 is a directory that contains file3.txt, file4.txt
|
|
* // dir3 is a directory that contains file5.txt
|
|
* // dir4 does not exist
|
|
*
|
|
* const fileList = [ 'dir1/file2.txt', 'dir2/file3.txt', 'dir/file5.txt'];
|
|
* const withMissingFileList = ['dir1/file1.txt', 'dir4/file2.txt'];
|
|
*
|
|
* // asynchronous function that deletes a file
|
|
* const deleteFile = function(file, callback) {
|
|
* fs.unlink(file, callback);
|
|
* };
|
|
*
|
|
* // Using callbacks
|
|
* async.each(fileList, deleteFile, function(err) {
|
|
* if( err ) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log('All files have been deleted successfully');
|
|
* }
|
|
* });
|
|
*
|
|
* // Error Handling
|
|
* async.each(withMissingFileList, deleteFile, function(err){
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* // since dir4/file2.txt does not exist
|
|
* // dir1/file1.txt could have been deleted
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.each(fileList, deleteFile)
|
|
* .then( () => {
|
|
* console.log('All files have been deleted successfully');
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Error Handling
|
|
* async.each(fileList, deleteFile)
|
|
* .then( () => {
|
|
* console.log('All files have been deleted successfully');
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* // since dir4/file2.txt does not exist
|
|
* // dir1/file1.txt could have been deleted
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* await async.each(files, deleteFile);
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
* // Error Handling
|
|
* async () => {
|
|
* try {
|
|
* await async.each(withMissingFileList, deleteFile);
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* // since dir4/file2.txt does not exist
|
|
* // dir1/file1.txt could have been deleted
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function eachLimit$2(coll, iteratee, callback) {
|
|
return eachOf$1(coll, _withoutIndex(wrapAsync(iteratee)), callback);
|
|
}
|
|
|
|
var each = awaitify(eachLimit$2, 3);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if a callback is omitted
|
|
*/
|
|
function eachLimit(coll, limit, iteratee, callback) {
|
|
return eachOfLimit$2(limit)(coll, _withoutIndex(wrapAsync(iteratee)), callback);
|
|
}
|
|
var eachLimit$1 = awaitify(eachLimit, 4);
|
|
|
|
/**
|
|
* The same as [`each`]{@link module:Collections.each} but runs only a single async operation at a time.
|
|
*
|
|
* Note, that unlike [`each`]{@link module:Collections.each}, this function applies iteratee to each item
|
|
* in series and therefore the iteratee functions will complete in order.
|
|
|
|
* @name eachSeries
|
|
* @static
|
|
* @memberOf module:Collections
|
|
* @method
|
|
* @see [async.each]{@link module:Collections.each}
|
|
* @alias forEachSeries
|
|
* @category Collection
|
|
* @param {Array|Iterable|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if a callback is omitted
|
|
*/
|
|
function eachSeries(coll, iteratee, callback) {
|
|
return eachLimit$1(coll, 1, iteratee, callback)
|
|
}
|
|
var eachSeries$1 = awaitify(eachSeries, 3);
|
|
|
|
/**
|
|
* 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 function (...args/*, callback*/) {
|
|
var callback = args.pop();
|
|
var sync = true;
|
|
args.push((...innerArgs) => {
|
|
if (sync) {
|
|
setImmediate$1(() => callback(...innerArgs));
|
|
} else {
|
|
callback(...innerArgs);
|
|
}
|
|
});
|
|
fn.apply(this, args);
|
|
sync = false;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback provided
|
|
* @example
|
|
*
|
|
* // dir1 is a directory that contains file1.txt, file2.txt
|
|
* // dir2 is a directory that contains file3.txt, file4.txt
|
|
* // dir3 is a directory that contains file5.txt
|
|
* // dir4 does not exist
|
|
*
|
|
* const fileList = ['dir1/file1.txt','dir2/file3.txt','dir3/file5.txt'];
|
|
* const withMissingFileList = ['file1.txt','file2.txt','file4.txt'];
|
|
*
|
|
* // asynchronous function that checks if a file exists
|
|
* function fileExists(file, callback) {
|
|
* fs.access(file, fs.constants.F_OK, (err) => {
|
|
* callback(null, !err);
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.every(fileList, fileExists, function(err, result) {
|
|
* console.log(result);
|
|
* // true
|
|
* // result is true since every file exists
|
|
* });
|
|
*
|
|
* async.every(withMissingFileList, fileExists, function(err, result) {
|
|
* console.log(result);
|
|
* // false
|
|
* // result is false since NOT every file exists
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.every(fileList, fileExists)
|
|
* .then( result => {
|
|
* console.log(result);
|
|
* // true
|
|
* // result is true since every file exists
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* async.every(withMissingFileList, fileExists)
|
|
* .then( result => {
|
|
* console.log(result);
|
|
* // false
|
|
* // result is false since NOT every file exists
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.every(fileList, fileExists);
|
|
* console.log(result);
|
|
* // true
|
|
* // result is true since every file exists
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.every(withMissingFileList, fileExists);
|
|
* console.log(result);
|
|
* // false
|
|
* // result is false since NOT every file exists
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function every(coll, iteratee, callback) {
|
|
return _createTester(bool => !bool, res => !res)(eachOf$1, coll, iteratee, callback)
|
|
}
|
|
var every$1 = awaitify(every, 3);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback provided
|
|
*/
|
|
function everyLimit(coll, limit, iteratee, callback) {
|
|
return _createTester(bool => !bool, res => !res)(eachOfLimit$2(limit), coll, iteratee, callback)
|
|
}
|
|
var everyLimit$1 = awaitify(everyLimit, 4);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback provided
|
|
*/
|
|
function everySeries(coll, iteratee, callback) {
|
|
return _createTester(bool => !bool, res => !res)(eachOfSeries$1, coll, iteratee, callback)
|
|
}
|
|
var everySeries$1 = awaitify(everySeries, 3);
|
|
|
|
function filterArray(eachfn, arr, iteratee, callback) {
|
|
var truthValues = new Array(arr.length);
|
|
eachfn(arr, (x, index, iterCb) => {
|
|
iteratee(x, (err, v) => {
|
|
truthValues[index] = !!v;
|
|
iterCb(err);
|
|
});
|
|
}, 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, (x, index, iterCb) => {
|
|
iteratee(x, (err, v) => {
|
|
if (err) return iterCb(err);
|
|
if (v) {
|
|
results.push({index, value: x});
|
|
}
|
|
iterCb(err);
|
|
});
|
|
}, err => {
|
|
if (err) return callback(err);
|
|
callback(null, results
|
|
.sort((a, b) => a.index - b.index)
|
|
.map(v => v.value));
|
|
});
|
|
}
|
|
|
|
function _filter(eachfn, coll, iteratee, callback) {
|
|
var filter = isArrayLike(coll) ? filterArray : filterGeneric;
|
|
return filter(eachfn, coll, wrapAsync(iteratee), callback);
|
|
}
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback provided
|
|
* @example
|
|
*
|
|
* // dir1 is a directory that contains file1.txt, file2.txt
|
|
* // dir2 is a directory that contains file3.txt, file4.txt
|
|
* // dir3 is a directory that contains file5.txt
|
|
*
|
|
* const files = ['dir1/file1.txt','dir2/file3.txt','dir3/file6.txt'];
|
|
*
|
|
* // asynchronous function that checks if a file exists
|
|
* function fileExists(file, callback) {
|
|
* fs.access(file, fs.constants.F_OK, (err) => {
|
|
* callback(null, !err);
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.filter(files, fileExists, function(err, results) {
|
|
* if(err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(results);
|
|
* // [ 'dir1/file1.txt', 'dir2/file3.txt' ]
|
|
* // results is now an array of the existing files
|
|
* }
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.filter(files, fileExists)
|
|
* .then(results => {
|
|
* console.log(results);
|
|
* // [ 'dir1/file1.txt', 'dir2/file3.txt' ]
|
|
* // results is now an array of the existing files
|
|
* }).catch(err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.filter(files, fileExists);
|
|
* console.log(results);
|
|
* // [ 'dir1/file1.txt', 'dir2/file3.txt' ]
|
|
* // results is now an array of the existing files
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function filter (coll, iteratee, callback) {
|
|
return _filter(eachOf$1, coll, iteratee, callback)
|
|
}
|
|
var filter$1 = awaitify(filter, 3);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback provided
|
|
*/
|
|
function filterLimit (coll, limit, iteratee, callback) {
|
|
return _filter(eachOfLimit$2(limit), coll, iteratee, callback)
|
|
}
|
|
var filterLimit$1 = awaitify(filterLimit, 4);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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)
|
|
* @returns {Promise} a promise, if no callback provided
|
|
*/
|
|
function filterSeries (coll, iteratee, callback) {
|
|
return _filter(eachOfSeries$1, coll, iteratee, callback)
|
|
}
|
|
var filterSeries$1 = awaitify(filterSeries, 3);
|
|
|
|
/**
|
|
* 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).
|
|
* @returns {Promise} a promise that rejects if an error occurs and an errback
|
|
* is not passed
|
|
* @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);
|
|
var task = wrapAsync(ensureAsync(fn));
|
|
|
|
function next(err) {
|
|
if (err) return done(err);
|
|
if (err === false) return;
|
|
task(next);
|
|
}
|
|
return next();
|
|
}
|
|
var forever$1 = awaitify(forever, 2);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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.
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function groupByLimit(coll, limit, iteratee, callback) {
|
|
var _iteratee = wrapAsync(iteratee);
|
|
return mapLimit$1(coll, limit, (val, iterCb) => {
|
|
_iteratee(val, (err, key) => {
|
|
if (err) return iterCb(err);
|
|
return iterCb(err, {key, val});
|
|
});
|
|
}, (err, mapResults) => {
|
|
var result = {};
|
|
// from MDN, handle object having an `hasOwnProperty` prop
|
|
var {hasOwnProperty} = Object.prototype;
|
|
|
|
for (var i = 0; i < mapResults.length; i++) {
|
|
if (mapResults[i]) {
|
|
var {key} = mapResults[i];
|
|
var {val} = mapResults[i];
|
|
|
|
if (hasOwnProperty.call(result, key)) {
|
|
result[key].push(val);
|
|
} else {
|
|
result[key] = [val];
|
|
}
|
|
}
|
|
}
|
|
|
|
return callback(err, result);
|
|
});
|
|
}
|
|
|
|
var groupByLimit$1 = awaitify(groupByLimit, 4);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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.
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
* @example
|
|
*
|
|
* // dir1 is a directory that contains file1.txt, file2.txt
|
|
* // dir2 is a directory that contains file3.txt, file4.txt
|
|
* // dir3 is a directory that contains file5.txt
|
|
* // dir4 does not exist
|
|
*
|
|
* const files = ['dir1/file1.txt','dir2','dir4']
|
|
*
|
|
* // asynchronous function that detects file type as none, file, or directory
|
|
* function detectFile(file, callback) {
|
|
* fs.stat(file, function(err, stat) {
|
|
* if (err) {
|
|
* return callback(null, 'none');
|
|
* }
|
|
* callback(null, stat.isDirectory() ? 'directory' : 'file');
|
|
* });
|
|
* }
|
|
*
|
|
* //Using callbacks
|
|
* async.groupBy(files, detectFile, function(err, result) {
|
|
* if(err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(result);
|
|
* // {
|
|
* // file: [ 'dir1/file1.txt' ],
|
|
* // none: [ 'dir4' ],
|
|
* // directory: [ 'dir2']
|
|
* // }
|
|
* // result is object containing the files grouped by type
|
|
* }
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.groupBy(files, detectFile)
|
|
* .then( result => {
|
|
* console.log(result);
|
|
* // {
|
|
* // file: [ 'dir1/file1.txt' ],
|
|
* // none: [ 'dir4' ],
|
|
* // directory: [ 'dir2']
|
|
* // }
|
|
* // result is object containing the files grouped by type
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.groupBy(files, detectFile);
|
|
* console.log(result);
|
|
* // {
|
|
* // file: [ 'dir1/file1.txt' ],
|
|
* // none: [ 'dir4' ],
|
|
* // directory: [ 'dir2']
|
|
* // }
|
|
* // result is object containing the files grouped by type
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function groupBy (coll, iteratee, callback) {
|
|
return groupByLimit$1(coll, Infinity, iteratee, callback)
|
|
}
|
|
|
|
/**
|
|
* 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|AsyncIterable|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` whose
|
|
* properties are arrays of values which returned the corresponding key.
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function groupBySeries (coll, iteratee, callback) {
|
|
return groupByLimit$1(coll, 1, iteratee, callback)
|
|
}
|
|
|
|
/**
|
|
* 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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function mapValuesLimit(obj, limit, iteratee, callback) {
|
|
callback = once(callback);
|
|
var newObj = {};
|
|
var _iteratee = wrapAsync(iteratee);
|
|
return eachOfLimit$2(limit)(obj, (val, key, next) => {
|
|
_iteratee(val, key, (err, result) => {
|
|
if (err) return next(err);
|
|
newObj[key] = result;
|
|
next(err);
|
|
});
|
|
}, err => callback(err, newObj));
|
|
}
|
|
|
|
var mapValuesLimit$1 = awaitify(mapValuesLimit, 4);
|
|
|
|
/**
|
|
* 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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
* @example
|
|
*
|
|
* // file1.txt is a file that is 1000 bytes in size
|
|
* // file2.txt is a file that is 2000 bytes in size
|
|
* // file3.txt is a file that is 3000 bytes in size
|
|
* // file4.txt does not exist
|
|
*
|
|
* const fileMap = {
|
|
* f1: 'file1.txt',
|
|
* f2: 'file2.txt',
|
|
* f3: 'file3.txt'
|
|
* };
|
|
*
|
|
* const withMissingFileMap = {
|
|
* f1: 'file1.txt',
|
|
* f2: 'file2.txt',
|
|
* f3: 'file4.txt'
|
|
* };
|
|
*
|
|
* // asynchronous function that returns the file size in bytes
|
|
* function getFileSizeInBytes(file, key, callback) {
|
|
* fs.stat(file, function(err, stat) {
|
|
* if (err) {
|
|
* return callback(err);
|
|
* }
|
|
* callback(null, stat.size);
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.mapValues(fileMap, getFileSizeInBytes, function(err, result) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(result);
|
|
* // result is now a map of file size in bytes for each file, e.g.
|
|
* // {
|
|
* // f1: 1000,
|
|
* // f2: 2000,
|
|
* // f3: 3000
|
|
* // }
|
|
* }
|
|
* });
|
|
*
|
|
* // Error handling
|
|
* async.mapValues(withMissingFileMap, getFileSizeInBytes, function(err, result) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* } else {
|
|
* console.log(result);
|
|
* }
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.mapValues(fileMap, getFileSizeInBytes)
|
|
* .then( result => {
|
|
* console.log(result);
|
|
* // result is now a map of file size in bytes for each file, e.g.
|
|
* // {
|
|
* // f1: 1000,
|
|
* // f2: 2000,
|
|
* // f3: 3000
|
|
* // }
|
|
* }).catch (err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Error Handling
|
|
* async.mapValues(withMissingFileMap, getFileSizeInBytes)
|
|
* .then( result => {
|
|
* console.log(result);
|
|
* }).catch (err => {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.mapValues(fileMap, getFileSizeInBytes);
|
|
* console.log(result);
|
|
* // result is now a map of file size in bytes for each file, e.g.
|
|
* // {
|
|
* // f1: 1000,
|
|
* // f2: 2000,
|
|
* // f3: 3000
|
|
* // }
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
* // Error Handling
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.mapValues(withMissingFileMap, getFileSizeInBytes);
|
|
* console.log(result);
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function mapValues(obj, iteratee, callback) {
|
|
return mapValuesLimit$1(obj, Infinity, iteratee, callback)
|
|
}
|
|
|
|
/**
|
|
* 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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function mapValuesSeries(obj, iteratee, callback) {
|
|
return mapValuesLimit$1(obj, 1, iteratee, callback)
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* **Note: if the async function errs, the result will not be cached and
|
|
* subsequent calls will call the wrapped function.**
|
|
*
|
|
* 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 = v => v) {
|
|
var memo = Object.create(null);
|
|
var queues = Object.create(null);
|
|
var _fn = wrapAsync(fn);
|
|
var memoized = initialParams((args, callback) => {
|
|
var key = hasher(...args);
|
|
if (key in memo) {
|
|
setImmediate$1(() => callback(null, ...memo[key]));
|
|
} else if (key in queues) {
|
|
queues[key].push(callback);
|
|
} else {
|
|
queues[key] = [callback];
|
|
_fn(...args, (err, ...resultArgs) => {
|
|
// #1465 don't memoize if an error occurred
|
|
if (!err) {
|
|
memo[key] = resultArgs;
|
|
}
|
|
var q = queues[key];
|
|
delete queues[key];
|
|
for (var i = 0, l = q.length; i < l; i++) {
|
|
q[i](err, ...resultArgs);
|
|
}
|
|
});
|
|
}
|
|
});
|
|
memoized.memo = memo;
|
|
memoized.unmemoized = fn;
|
|
return memoized;
|
|
}
|
|
|
|
/* istanbul ignore file */
|
|
|
|
/**
|
|
* 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;
|
|
|
|
if (hasNextTick) {
|
|
_defer = process.nextTick;
|
|
} else if (hasSetImmediate) {
|
|
_defer = setImmediate;
|
|
} else {
|
|
_defer = fallback;
|
|
}
|
|
|
|
var nextTick = wrap(_defer);
|
|
|
|
var _parallel = awaitify((eachfn, tasks, callback) => {
|
|
var results = isArrayLike(tasks) ? [] : {};
|
|
|
|
eachfn(tasks, (task, key, taskCb) => {
|
|
wrapAsync(task)((err, ...result) => {
|
|
if (result.length < 2) {
|
|
[result] = result;
|
|
}
|
|
results[key] = result;
|
|
taskCb(err);
|
|
});
|
|
}, err => callback(err, results));
|
|
}, 3);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if a callback is not passed
|
|
*
|
|
* @example
|
|
*
|
|
* //Using Callbacks
|
|
* async.parallel([
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'one');
|
|
* }, 200);
|
|
* },
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'two');
|
|
* }, 100);
|
|
* }
|
|
* ], function(err, results) {
|
|
* console.log(results);
|
|
* // results is equal to ['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) {
|
|
* console.log(results);
|
|
* // results is equal to: { one: 1, two: 2 }
|
|
* });
|
|
*
|
|
* //Using Promises
|
|
* async.parallel([
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'one');
|
|
* }, 200);
|
|
* },
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'two');
|
|
* }, 100);
|
|
* }
|
|
* ]).then(results => {
|
|
* console.log(results);
|
|
* // results is equal to ['one','two'] even though
|
|
* // the second function had a shorter timeout.
|
|
* }).catch(err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // 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);
|
|
* }
|
|
* }).then(results => {
|
|
* console.log(results);
|
|
* // results is equal to: { one: 1, two: 2 }
|
|
* }).catch(err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* //Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.parallel([
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'one');
|
|
* }, 200);
|
|
* },
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'two');
|
|
* }, 100);
|
|
* }
|
|
* ]);
|
|
* console.log(results);
|
|
* // results is equal to ['one','two'] even though
|
|
* // the second function had a shorter timeout.
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
* // an example using an object instead of an array
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.parallel({
|
|
* one: function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 1);
|
|
* }, 200);
|
|
* },
|
|
* two: function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 2);
|
|
* }, 100);
|
|
* }
|
|
* });
|
|
* console.log(results);
|
|
* // results is equal to: { one: 1, two: 2 }
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function parallel(tasks, callback) {
|
|
return _parallel(eachOf$1, 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if a callback is not passed
|
|
*/
|
|
function parallelLimit(tasks, limit, callback) {
|
|
return _parallel(eachOfLimit$2(limit), tasks, callback);
|
|
}
|
|
|
|
/**
|
|
* A queue of tasks for the worker function to complete.
|
|
* @typedef {Iterable} 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 {number} payload - an integer that specifies how many items are
|
|
* passed to the worker function at a time. only applies if this is a
|
|
* [cargo]{@link module:ControlFlow.cargo} object
|
|
* @property {AsyncFunction} 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 {AsyncFunction} unshift - add a new task to the front of the `queue`.
|
|
* Invoke with `queue.unshift(task, [callback])`.
|
|
* @property {AsyncFunction} pushAsync - the same as `q.push`, except this returns
|
|
* a promise that rejects if an error occurs.
|
|
* @property {AsyncFunction} unshiftAsync - the same as `q.unshift`, except this returns
|
|
* a promise that rejects if an error occurs.
|
|
* @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 function that sets a callback that is
|
|
* called when the number of running workers hits the `concurrency` limit, and
|
|
* further tasks will be queued. If the callback is omitted, `q.saturated()`
|
|
* returns a promise for the next occurrence.
|
|
* @property {Function} unsaturated - a function that sets 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. If the callback is
|
|
* omitted, `q.unsaturated()` returns a promise for the next occurrence.
|
|
* @property {number} buffer - A minimum threshold buffer in order to say that
|
|
* the `queue` is `unsaturated`.
|
|
* @property {Function} empty - a function that sets a callback that is called
|
|
* when the last item from the `queue` is given to a `worker`. If the callback
|
|
* is omitted, `q.empty()` returns a promise for the next occurrence.
|
|
* @property {Function} drain - a function that sets a callback that is called
|
|
* when the last item from the `queue` has returned from the `worker`. If the
|
|
* callback is omitted, `q.drain()` returns a promise for the next occurrence.
|
|
* @property {Function} error - a function that sets a callback that is called
|
|
* when a task errors. Has the signature `function(error, task)`. If the
|
|
* callback is omitted, `error()` returns a promise that rejects on the next
|
|
* error.
|
|
* @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()`.
|
|
*
|
|
* @example
|
|
* const q = async.queue(worker, 2)
|
|
* q.push(item1)
|
|
* q.push(item2)
|
|
* q.push(item3)
|
|
* // queues are iterable, spread into an array to inspect
|
|
* const items = [...q] // [item1, item2, item3]
|
|
* // or use for of
|
|
* for (let item of q) {
|
|
* console.log(item)
|
|
* }
|
|
*
|
|
* q.drain(() => {
|
|
* console.log('all done')
|
|
* })
|
|
* // or
|
|
* await q.drain()
|
|
*/
|
|
|
|
/**
|
|
* 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 be
|
|
* 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');
|
|
* });
|
|
* // or await the end
|
|
* await q.drain()
|
|
*
|
|
* // assign an error callback
|
|
* q.error(function(err, task) {
|
|
* console.error('task experienced an error');
|
|
* });
|
|
*
|
|
* // add some items to the queue
|
|
* q.push({name: 'foo'}, function(err) {
|
|
* console.log('finished processing foo');
|
|
* });
|
|
* // callback is optional
|
|
* q.push({name: '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');
|
|
* });
|
|
*/
|
|
function queue (worker, concurrency) {
|
|
var _worker = wrapAsync(worker);
|
|
return queue$1((items, cb) => {
|
|
_worker(items[0], cb);
|
|
}, concurrency, 1);
|
|
}
|
|
|
|
// Binary min-heap implementation used for priority queue.
|
|
// Implementation is stable, i.e. push time is considered for equal priorities
|
|
class Heap {
|
|
constructor() {
|
|
this.heap = [];
|
|
this.pushCount = Number.MIN_SAFE_INTEGER;
|
|
}
|
|
|
|
get length() {
|
|
return this.heap.length;
|
|
}
|
|
|
|
empty () {
|
|
this.heap = [];
|
|
return this;
|
|
}
|
|
|
|
percUp(index) {
|
|
let p;
|
|
|
|
while (index > 0 && smaller(this.heap[index], this.heap[p=parent(index)])) {
|
|
let t = this.heap[index];
|
|
this.heap[index] = this.heap[p];
|
|
this.heap[p] = t;
|
|
|
|
index = p;
|
|
}
|
|
}
|
|
|
|
percDown(index) {
|
|
let l;
|
|
|
|
while ((l=leftChi(index)) < this.heap.length) {
|
|
if (l+1 < this.heap.length && smaller(this.heap[l+1], this.heap[l])) {
|
|
l = l+1;
|
|
}
|
|
|
|
if (smaller(this.heap[index], this.heap[l])) {
|
|
break;
|
|
}
|
|
|
|
let t = this.heap[index];
|
|
this.heap[index] = this.heap[l];
|
|
this.heap[l] = t;
|
|
|
|
index = l;
|
|
}
|
|
}
|
|
|
|
push(node) {
|
|
node.pushCount = ++this.pushCount;
|
|
this.heap.push(node);
|
|
this.percUp(this.heap.length-1);
|
|
}
|
|
|
|
unshift(node) {
|
|
return this.heap.push(node);
|
|
}
|
|
|
|
shift() {
|
|
let [top] = this.heap;
|
|
|
|
this.heap[0] = this.heap[this.heap.length-1];
|
|
this.heap.pop();
|
|
this.percDown(0);
|
|
|
|
return top;
|
|
}
|
|
|
|
toArray() {
|
|
return [...this];
|
|
}
|
|
|
|
*[Symbol.iterator] () {
|
|
for (let i = 0; i < this.heap.length; i++) {
|
|
yield this.heap[i].data;
|
|
}
|
|
}
|
|
|
|
remove (testFn) {
|
|
let j = 0;
|
|
for (let i = 0; i < this.heap.length; i++) {
|
|
if (!testFn(this.heap[i])) {
|
|
this.heap[j] = this.heap[i];
|
|
j++;
|
|
}
|
|
}
|
|
|
|
this.heap.splice(j);
|
|
|
|
for (let i = parent(this.heap.length-1); i >= 0; i--) {
|
|
this.percDown(i);
|
|
}
|
|
|
|
return this;
|
|
}
|
|
}
|
|
|
|
function leftChi(i) {
|
|
return (i<<1)+1;
|
|
}
|
|
|
|
function parent(i) {
|
|
return ((i+1)>>1)-1;
|
|
}
|
|
|
|
function smaller(x, y) {
|
|
if (x.priority !== y.priority) {
|
|
return x.priority < y.priority;
|
|
}
|
|
else {
|
|
return x.pushCount < y.pushCount;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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 three
|
|
* 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.
|
|
* * `pushAsync(task, priority, [callback])` - the same as `priorityQueue.push`,
|
|
* except this returns a promise that rejects if an error occurs.
|
|
* * The `unshift` and `unshiftAsync` methods were removed.
|
|
*/
|
|
function priorityQueue(worker, concurrency) {
|
|
// Start with a normal queue
|
|
var q = queue(worker, concurrency);
|
|
|
|
var {
|
|
push,
|
|
pushAsync
|
|
} = q;
|
|
|
|
q._tasks = new Heap();
|
|
q._createTaskItem = ({data, priority}, callback) => {
|
|
return {
|
|
data,
|
|
priority,
|
|
callback
|
|
};
|
|
};
|
|
|
|
function createDataItems(tasks, priority) {
|
|
if (!Array.isArray(tasks)) {
|
|
return {data: tasks, priority};
|
|
}
|
|
return tasks.map(data => { return {data, priority}; });
|
|
}
|
|
|
|
// Override push to accept second parameter representing priority
|
|
q.push = function(data, priority = 0, callback) {
|
|
return push(createDataItems(data, priority), callback);
|
|
};
|
|
|
|
q.pushAsync = function(data, priority = 0, callback) {
|
|
return pushAsync(createDataItems(data, priority), callback);
|
|
};
|
|
|
|
// Remove unshift functions
|
|
delete q.unshift;
|
|
delete q.unshiftAsync;
|
|
|
|
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 {Promise} a promise, if a callback is omitted
|
|
* @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);
|
|
if (!Array.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);
|
|
}
|
|
}
|
|
|
|
var race$1 = awaitify(race, 2);
|
|
|
|
/**
|
|
* 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 completes 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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function reduceRight (array, memo, iteratee, callback) {
|
|
var reversed = [...array].reverse();
|
|
return reduce$1(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((error, ...cbArgs) => {
|
|
let retVal = {};
|
|
if (error) {
|
|
retVal.error = error;
|
|
}
|
|
if (cbArgs.length > 0){
|
|
var value = cbArgs;
|
|
if (cbArgs.length <= 1) {
|
|
[value] = cbArgs;
|
|
}
|
|
retVal.value = value;
|
|
}
|
|
reflectCallback(null, retVal);
|
|
});
|
|
|
|
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 (Array.isArray(tasks)) {
|
|
results = tasks.map(reflect);
|
|
} else {
|
|
results = {};
|
|
Object.keys(tasks).forEach(key => {
|
|
results[key] = reflect.call(this, tasks[key]);
|
|
});
|
|
}
|
|
return results;
|
|
}
|
|
|
|
function reject$2(eachfn, arr, _iteratee, callback) {
|
|
const iteratee = wrapAsync(_iteratee);
|
|
return _filter(eachfn, arr, (value, cb) => {
|
|
iteratee(value, (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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
* @example
|
|
*
|
|
* // dir1 is a directory that contains file1.txt, file2.txt
|
|
* // dir2 is a directory that contains file3.txt, file4.txt
|
|
* // dir3 is a directory that contains file5.txt
|
|
*
|
|
* const fileList = ['dir1/file1.txt','dir2/file3.txt','dir3/file6.txt'];
|
|
*
|
|
* // asynchronous function that checks if a file exists
|
|
* function fileExists(file, callback) {
|
|
* fs.access(file, fs.constants.F_OK, (err) => {
|
|
* callback(null, !err);
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.reject(fileList, fileExists, function(err, results) {
|
|
* // [ 'dir3/file6.txt' ]
|
|
* // results now equals an array of the non-existing files
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.reject(fileList, fileExists)
|
|
* .then( results => {
|
|
* console.log(results);
|
|
* // [ 'dir3/file6.txt' ]
|
|
* // results now equals an array of the non-existing files
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.reject(fileList, fileExists);
|
|
* console.log(results);
|
|
* // [ 'dir3/file6.txt' ]
|
|
* // results now equals an array of the non-existing files
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function reject (coll, iteratee, callback) {
|
|
return reject$2(eachOf$1, coll, iteratee, callback)
|
|
}
|
|
var reject$1 = awaitify(reject, 3);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function rejectLimit (coll, limit, iteratee, callback) {
|
|
return reject$2(eachOfLimit$2(limit), coll, iteratee, callback)
|
|
}
|
|
var rejectLimit$1 = awaitify(rejectLimit, 4);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
*/
|
|
function rejectSeries (coll, iteratee, callback) {
|
|
return reject$2(eachOfSeries$1, coll, iteratee, callback)
|
|
}
|
|
var rejectSeries$1 = awaitify(rejectSeries, 3);
|
|
|
|
function constant(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).
|
|
* @returns {Promise} a promise if no callback provided
|
|
*
|
|
* @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
|
|
* });
|
|
*
|
|
*/
|
|
const DEFAULT_TIMES = 5;
|
|
const DEFAULT_INTERVAL = 0;
|
|
|
|
function retry(opts, task, callback) {
|
|
var options = {
|
|
times: DEFAULT_TIMES,
|
|
intervalFunc: constant(DEFAULT_INTERVAL)
|
|
};
|
|
|
|
if (arguments.length < 3 && typeof opts === 'function') {
|
|
callback = task || promiseCallback();
|
|
task = opts;
|
|
} else {
|
|
parseTimes(options, opts);
|
|
callback = callback || promiseCallback();
|
|
}
|
|
|
|
if (typeof task !== 'function') {
|
|
throw new Error("Invalid arguments for async.retry");
|
|
}
|
|
|
|
var _task = wrapAsync(task);
|
|
|
|
var attempt = 1;
|
|
function retryAttempt() {
|
|
_task((err, ...args) => {
|
|
if (err === false) return
|
|
if (err && attempt++ < options.times &&
|
|
(typeof options.errorFilter != 'function' ||
|
|
options.errorFilter(err))) {
|
|
setTimeout(retryAttempt, options.intervalFunc(attempt - 1));
|
|
} else {
|
|
callback(err, ...args);
|
|
}
|
|
});
|
|
}
|
|
|
|
retryAttempt();
|
|
return callback[PROMISE_SYMBOL]
|
|
}
|
|
|
|
function parseTimes(acc, t) {
|
|
if (typeof t === 'object') {
|
|
acc.times = +t.times || DEFAULT_TIMES;
|
|
|
|
acc.intervalFunc = typeof t.interval === 'function' ?
|
|
t.interval :
|
|
constant(+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");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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`, except for a `opts.arity` that
|
|
* is the arity of the `task` function, defaulting to `task.length`
|
|
* @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);
|
|
*/
|
|
function retryable (opts, task) {
|
|
if (!task) {
|
|
task = opts;
|
|
opts = null;
|
|
}
|
|
let arity = (opts && opts.arity) || task.length;
|
|
if (isAsync(task)) {
|
|
arity += 1;
|
|
}
|
|
var _task = wrapAsync(task);
|
|
return initialParams((args, callback) => {
|
|
if (args.length < arity - 1 || callback == null) {
|
|
args.push(callback);
|
|
callback = promiseCallback();
|
|
}
|
|
function taskFn(cb) {
|
|
_task(...args, cb);
|
|
}
|
|
|
|
if (opts) retry(opts, taskFn, callback);
|
|
else retry(taskFn, callback);
|
|
|
|
return callback[PROMISE_SYMBOL]
|
|
});
|
|
}
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @return {Promise} a promise, if no callback is passed
|
|
* @example
|
|
*
|
|
* //Using Callbacks
|
|
* async.series([
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* // do some async task
|
|
* callback(null, 'one');
|
|
* }, 200);
|
|
* },
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* // then do another async task
|
|
* callback(null, 'two');
|
|
* }, 100);
|
|
* }
|
|
* ], function(err, results) {
|
|
* console.log(results);
|
|
* // results is equal to ['one','two']
|
|
* });
|
|
*
|
|
* // an example using objects instead of arrays
|
|
* async.series({
|
|
* one: function(callback) {
|
|
* setTimeout(function() {
|
|
* // do some async task
|
|
* callback(null, 1);
|
|
* }, 200);
|
|
* },
|
|
* two: function(callback) {
|
|
* setTimeout(function() {
|
|
* // then do another async task
|
|
* callback(null, 2);
|
|
* }, 100);
|
|
* }
|
|
* }, function(err, results) {
|
|
* console.log(results);
|
|
* // results is equal to: { one: 1, two: 2 }
|
|
* });
|
|
*
|
|
* //Using Promises
|
|
* async.series([
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'one');
|
|
* }, 200);
|
|
* },
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* callback(null, 'two');
|
|
* }, 100);
|
|
* }
|
|
* ]).then(results => {
|
|
* console.log(results);
|
|
* // results is equal to ['one','two']
|
|
* }).catch(err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // an example using an object instead of an array
|
|
* async.series({
|
|
* one: function(callback) {
|
|
* setTimeout(function() {
|
|
* // do some async task
|
|
* callback(null, 1);
|
|
* }, 200);
|
|
* },
|
|
* two: function(callback) {
|
|
* setTimeout(function() {
|
|
* // then do another async task
|
|
* callback(null, 2);
|
|
* }, 100);
|
|
* }
|
|
* }).then(results => {
|
|
* console.log(results);
|
|
* // results is equal to: { one: 1, two: 2 }
|
|
* }).catch(err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* //Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.series([
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* // do some async task
|
|
* callback(null, 'one');
|
|
* }, 200);
|
|
* },
|
|
* function(callback) {
|
|
* setTimeout(function() {
|
|
* // then do another async task
|
|
* callback(null, 'two');
|
|
* }, 100);
|
|
* }
|
|
* ]);
|
|
* console.log(results);
|
|
* // results is equal to ['one','two']
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
* // an example using an object instead of an array
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.parallel({
|
|
* one: function(callback) {
|
|
* setTimeout(function() {
|
|
* // do some async task
|
|
* callback(null, 1);
|
|
* }, 200);
|
|
* },
|
|
* two: function(callback) {
|
|
* setTimeout(function() {
|
|
* // then do another async task
|
|
* callback(null, 2);
|
|
* }, 100);
|
|
* }
|
|
* });
|
|
* console.log(results);
|
|
* // results is equal to: { one: 1, two: 2 }
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function series(tasks, callback) {
|
|
return _parallel(eachOfSeries$1, 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback provided
|
|
* @example
|
|
*
|
|
* // dir1 is a directory that contains file1.txt, file2.txt
|
|
* // dir2 is a directory that contains file3.txt, file4.txt
|
|
* // dir3 is a directory that contains file5.txt
|
|
* // dir4 does not exist
|
|
*
|
|
* // asynchronous function that checks if a file exists
|
|
* function fileExists(file, callback) {
|
|
* fs.access(file, fs.constants.F_OK, (err) => {
|
|
* callback(null, !err);
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.some(['dir1/missing.txt','dir2/missing.txt','dir3/file5.txt'], fileExists,
|
|
* function(err, result) {
|
|
* console.log(result);
|
|
* // true
|
|
* // result is true since some file in the list exists
|
|
* }
|
|
*);
|
|
*
|
|
* async.some(['dir1/missing.txt','dir2/missing.txt','dir4/missing.txt'], fileExists,
|
|
* function(err, result) {
|
|
* console.log(result);
|
|
* // false
|
|
* // result is false since none of the files exists
|
|
* }
|
|
*);
|
|
*
|
|
* // Using Promises
|
|
* async.some(['dir1/missing.txt','dir2/missing.txt','dir3/file5.txt'], fileExists)
|
|
* .then( result => {
|
|
* console.log(result);
|
|
* // true
|
|
* // result is true since some file in the list exists
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* async.some(['dir1/missing.txt','dir2/missing.txt','dir4/missing.txt'], fileExists)
|
|
* .then( result => {
|
|
* console.log(result);
|
|
* // false
|
|
* // result is false since none of the files exists
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.some(['dir1/missing.txt','dir2/missing.txt','dir3/file5.txt'], fileExists);
|
|
* console.log(result);
|
|
* // true
|
|
* // result is true since some file in the list exists
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.some(['dir1/missing.txt','dir2/missing.txt','dir4/missing.txt'], fileExists);
|
|
* console.log(result);
|
|
* // false
|
|
* // result is false since none of the files exists
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function some(coll, iteratee, callback) {
|
|
return _createTester(Boolean, res => res)(eachOf$1, coll, iteratee, callback)
|
|
}
|
|
var some$1 = awaitify(some, 3);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback provided
|
|
*/
|
|
function someLimit(coll, limit, iteratee, callback) {
|
|
return _createTester(Boolean, res => res)(eachOfLimit$2(limit), coll, iteratee, callback)
|
|
}
|
|
var someLimit$1 = awaitify(someLimit, 4);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback provided
|
|
*/
|
|
function someSeries(coll, iteratee, callback) {
|
|
return _createTester(Boolean, res => res)(eachOfSeries$1, coll, iteratee, callback)
|
|
}
|
|
var someSeries$1 = awaitify(someSeries, 3);
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback passed
|
|
* @example
|
|
*
|
|
* // bigfile.txt is a file that is 251100 bytes in size
|
|
* // mediumfile.txt is a file that is 11000 bytes in size
|
|
* // smallfile.txt is a file that is 121 bytes in size
|
|
*
|
|
* // asynchronous function that returns the file size in bytes
|
|
* function getFileSizeInBytes(file, callback) {
|
|
* fs.stat(file, function(err, stat) {
|
|
* if (err) {
|
|
* return callback(err);
|
|
* }
|
|
* callback(null, stat.size);
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.sortBy(['mediumfile.txt','smallfile.txt','bigfile.txt'], getFileSizeInBytes,
|
|
* function(err, results) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(results);
|
|
* // results is now the original array of files sorted by
|
|
* // file size (ascending by default), e.g.
|
|
* // [ 'smallfile.txt', 'mediumfile.txt', 'bigfile.txt']
|
|
* }
|
|
* }
|
|
* );
|
|
*
|
|
* // By modifying the callback parameter the
|
|
* // sorting order can be influenced:
|
|
*
|
|
* // ascending order
|
|
* async.sortBy(['mediumfile.txt','smallfile.txt','bigfile.txt'], function(file, callback) {
|
|
* getFileSizeInBytes(file, function(getFileSizeErr, fileSize) {
|
|
* if (getFileSizeErr) return callback(getFileSizeErr);
|
|
* callback(null, fileSize);
|
|
* });
|
|
* }, function(err, results) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(results);
|
|
* // results is now the original array of files sorted by
|
|
* // file size (ascending by default), e.g.
|
|
* // [ 'smallfile.txt', 'mediumfile.txt', 'bigfile.txt']
|
|
* }
|
|
* }
|
|
* );
|
|
*
|
|
* // descending order
|
|
* async.sortBy(['bigfile.txt','mediumfile.txt','smallfile.txt'], function(file, callback) {
|
|
* getFileSizeInBytes(file, function(getFileSizeErr, fileSize) {
|
|
* if (getFileSizeErr) {
|
|
* return callback(getFileSizeErr);
|
|
* }
|
|
* callback(null, fileSize * -1);
|
|
* });
|
|
* }, function(err, results) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(results);
|
|
* // results is now the original array of files sorted by
|
|
* // file size (ascending by default), e.g.
|
|
* // [ 'bigfile.txt', 'mediumfile.txt', 'smallfile.txt']
|
|
* }
|
|
* }
|
|
* );
|
|
*
|
|
* // Error handling
|
|
* async.sortBy(['mediumfile.txt','smallfile.txt','missingfile.txt'], getFileSizeInBytes,
|
|
* function(err, results) {
|
|
* if (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* } else {
|
|
* console.log(results);
|
|
* }
|
|
* }
|
|
* );
|
|
*
|
|
* // Using Promises
|
|
* async.sortBy(['mediumfile.txt','smallfile.txt','bigfile.txt'], getFileSizeInBytes)
|
|
* .then( results => {
|
|
* console.log(results);
|
|
* // results is now the original array of files sorted by
|
|
* // file size (ascending by default), e.g.
|
|
* // [ 'smallfile.txt', 'mediumfile.txt', 'bigfile.txt']
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Error handling
|
|
* async.sortBy(['mediumfile.txt','smallfile.txt','missingfile.txt'], getFileSizeInBytes)
|
|
* .then( results => {
|
|
* console.log(results);
|
|
* }).catch( err => {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* (async () => {
|
|
* try {
|
|
* let results = await async.sortBy(['bigfile.txt','mediumfile.txt','smallfile.txt'], getFileSizeInBytes);
|
|
* console.log(results);
|
|
* // results is now the original array of files sorted by
|
|
* // file size (ascending by default), e.g.
|
|
* // [ 'smallfile.txt', 'mediumfile.txt', 'bigfile.txt']
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* })();
|
|
*
|
|
* // Error handling
|
|
* async () => {
|
|
* try {
|
|
* let results = await async.sortBy(['missingfile.txt','mediumfile.txt','smallfile.txt'], getFileSizeInBytes);
|
|
* console.log(results);
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* // [ Error: ENOENT: no such file or directory ]
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function sortBy (coll, iteratee, callback) {
|
|
var _iteratee = wrapAsync(iteratee);
|
|
return map$1(coll, (x, iterCb) => {
|
|
_iteratee(x, (err, criteria) => {
|
|
if (err) return iterCb(err);
|
|
iterCb(err, {value: x, criteria});
|
|
});
|
|
}, (err, results) => {
|
|
if (err) return callback(err);
|
|
callback(null, results.sort(comparator).map(v => v.value));
|
|
});
|
|
|
|
function comparator(left, right) {
|
|
var a = left.criteria, b = right.criteria;
|
|
return a < b ? -1 : a > b ? 1 : 0;
|
|
}
|
|
}
|
|
var sortBy$1 = awaitify(sortBy, 3);
|
|
|
|
/**
|
|
* 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((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((...cbArgs) => {
|
|
if (!timedOut) {
|
|
callback(...cbArgs);
|
|
clearTimeout(timer);
|
|
}
|
|
});
|
|
|
|
// setup timer and call original function
|
|
timer = setTimeout(timeoutCallback, milliseconds);
|
|
fn(...args);
|
|
});
|
|
}
|
|
|
|
function range(size) {
|
|
var result = Array(size);
|
|
while (size--) {
|
|
result[size] = size;
|
|
}
|
|
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}.
|
|
* @returns {Promise} a promise, if no callback is provided
|
|
*/
|
|
function timesLimit(count, limit, iteratee, callback) {
|
|
var _iteratee = wrapAsync(iteratee);
|
|
return mapLimit$1(range(count), 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}.
|
|
* @returns {Promise} a promise, if no callback is provided
|
|
* @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
|
|
* });
|
|
*/
|
|
function times (n, iteratee, callback) {
|
|
return timesLimit(n, Infinity, iteratee, callback)
|
|
}
|
|
|
|
/**
|
|
* 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}.
|
|
* @returns {Promise} a promise, if no callback is provided
|
|
*/
|
|
function timesSeries (n, iteratee, callback) {
|
|
return timesLimit(n, 1, iteratee, callback)
|
|
}
|
|
|
|
/**
|
|
* A relative of `reduce`. Takes an Object or Array, and iterates over each
|
|
* element in parallel, 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback provided
|
|
* @example
|
|
*
|
|
* // file1.txt is a file that is 1000 bytes in size
|
|
* // file2.txt is a file that is 2000 bytes in size
|
|
* // file3.txt is a file that is 3000 bytes in size
|
|
*
|
|
* // helper function that returns human-readable size format from bytes
|
|
* function formatBytes(bytes, decimals = 2) {
|
|
* // implementation not included for brevity
|
|
* return humanReadbleFilesize;
|
|
* }
|
|
*
|
|
* const fileList = ['file1.txt','file2.txt','file3.txt'];
|
|
*
|
|
* // asynchronous function that returns the file size, transformed to human-readable format
|
|
* // e.g. 1024 bytes = 1KB, 1234 bytes = 1.21 KB, 1048576 bytes = 1MB, etc.
|
|
* function transformFileSize(acc, value, key, callback) {
|
|
* fs.stat(value, function(err, stat) {
|
|
* if (err) {
|
|
* return callback(err);
|
|
* }
|
|
* acc[key] = formatBytes(stat.size);
|
|
* callback(null);
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.transform(fileList, transformFileSize, function(err, result) {
|
|
* if(err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(result);
|
|
* // [ '1000 Bytes', '1.95 KB', '2.93 KB' ]
|
|
* }
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.transform(fileList, transformFileSize)
|
|
* .then(result => {
|
|
* console.log(result);
|
|
* // [ '1000 Bytes', '1.95 KB', '2.93 KB' ]
|
|
* }).catch(err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* (async () => {
|
|
* try {
|
|
* let result = await async.transform(fileList, transformFileSize);
|
|
* console.log(result);
|
|
* // [ '1000 Bytes', '1.95 KB', '2.93 KB' ]
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* })();
|
|
*
|
|
* @example
|
|
*
|
|
* // file1.txt is a file that is 1000 bytes in size
|
|
* // file2.txt is a file that is 2000 bytes in size
|
|
* // file3.txt is a file that is 3000 bytes in size
|
|
*
|
|
* // helper function that returns human-readable size format from bytes
|
|
* function formatBytes(bytes, decimals = 2) {
|
|
* // implementation not included for brevity
|
|
* return humanReadbleFilesize;
|
|
* }
|
|
*
|
|
* const fileMap = { f1: 'file1.txt', f2: 'file2.txt', f3: 'file3.txt' };
|
|
*
|
|
* // asynchronous function that returns the file size, transformed to human-readable format
|
|
* // e.g. 1024 bytes = 1KB, 1234 bytes = 1.21 KB, 1048576 bytes = 1MB, etc.
|
|
* function transformFileSize(acc, value, key, callback) {
|
|
* fs.stat(value, function(err, stat) {
|
|
* if (err) {
|
|
* return callback(err);
|
|
* }
|
|
* acc[key] = formatBytes(stat.size);
|
|
* callback(null);
|
|
* });
|
|
* }
|
|
*
|
|
* // Using callbacks
|
|
* async.transform(fileMap, transformFileSize, function(err, result) {
|
|
* if(err) {
|
|
* console.log(err);
|
|
* } else {
|
|
* console.log(result);
|
|
* // { f1: '1000 Bytes', f2: '1.95 KB', f3: '2.93 KB' }
|
|
* }
|
|
* });
|
|
*
|
|
* // Using Promises
|
|
* async.transform(fileMap, transformFileSize)
|
|
* .then(result => {
|
|
* console.log(result);
|
|
* // { f1: '1000 Bytes', f2: '1.95 KB', f3: '2.93 KB' }
|
|
* }).catch(err => {
|
|
* console.log(err);
|
|
* });
|
|
*
|
|
* // Using async/await
|
|
* async () => {
|
|
* try {
|
|
* let result = await async.transform(fileMap, transformFileSize);
|
|
* console.log(result);
|
|
* // { f1: '1000 Bytes', f2: '1.95 KB', f3: '2.93 KB' }
|
|
* }
|
|
* catch (err) {
|
|
* console.log(err);
|
|
* }
|
|
* }
|
|
*
|
|
*/
|
|
function transform (coll, accumulator, iteratee, callback) {
|
|
if (arguments.length <= 3 && typeof accumulator === 'function') {
|
|
callback = iteratee;
|
|
iteratee = accumulator;
|
|
accumulator = Array.isArray(coll) ? [] : {};
|
|
}
|
|
callback = once(callback || promiseCallback());
|
|
var _iteratee = wrapAsync(iteratee);
|
|
|
|
eachOf$1(coll, (v, k, cb) => {
|
|
_iteratee(accumulator, v, k, cb);
|
|
}, err => callback(err, accumulator));
|
|
return callback[PROMISE_SYMBOL]
|
|
}
|
|
|
|
/**
|
|
* 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|AsyncIterable|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).
|
|
* @returns {Promise} a promise, if no callback is passed
|
|
* @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;
|
|
return eachSeries$1(tasks, (task, taskCb) => {
|
|
wrapAsync(task)((err, ...args) => {
|
|
if (err === false) return taskCb(err);
|
|
|
|
if (args.length < 2) {
|
|
[result] = args;
|
|
} else {
|
|
result = args;
|
|
}
|
|
error = err;
|
|
taskCb(err ? null : {});
|
|
});
|
|
}, () => callback(error, result));
|
|
}
|
|
|
|
var tryEach$1 = awaitify(tryEach);
|
|
|
|
/**
|
|
* Undoes a [memoize]{@link module:Utils.memoize}d function, reverting it to the original,
|
|
* unmemoized form. Handy for testing.
|
|
*
|
|
* @name unmemoize
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* @static
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* @memberOf module:Utils
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* @method
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* @see [async.memoize]{@link module:Utils.memoize}
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* @category Util
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* @param {AsyncFunction} fn - the memoized function
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* @returns {AsyncFunction} a function that calls the original unmemoized function
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*/
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function unmemoize(fn) {
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return (...args) => {
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return (fn.unmemoized || fn)(...args);
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};
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}
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/**
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* Repeatedly call `iteratee`, while `test` returns `true`. Calls `callback` when
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* stopped, or an error occurs.
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*
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* @name whilst
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @category Control Flow
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* @param {AsyncFunction} test - asynchronous truth test to perform before each
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* execution of `iteratee`. Invoked with (callback).
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* @param {AsyncFunction} iteratee - An async function which is called each time
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* `test` passes. Invoked with (callback).
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* @param {Function} [callback] - A callback which is called after the test
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* function has failed and repeated execution of `iteratee` has stopped. `callback`
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* will be passed an error and any arguments passed to the final `iteratee`'s
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* callback. Invoked with (err, [results]);
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* @returns {Promise} a promise, if no callback is passed
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* @example
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*
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* var count = 0;
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* async.whilst(
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* function test(cb) { cb(null, count < 5); },
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* function iter(callback) {
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* count++;
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* setTimeout(function() {
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* callback(null, count);
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* }, 1000);
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* },
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* function (err, n) {
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* // 5 seconds have passed, n = 5
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* }
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* );
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*/
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function whilst(test, iteratee, callback) {
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callback = onlyOnce(callback);
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var _fn = wrapAsync(iteratee);
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var _test = wrapAsync(test);
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var results = [];
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function next(err, ...rest) {
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if (err) return callback(err);
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results = rest;
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if (err === false) return;
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_test(check);
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}
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function check(err, truth) {
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if (err) return callback(err);
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if (err === false) return;
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if (!truth) return callback(null, ...results);
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_fn(next);
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}
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return _test(check);
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}
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var whilst$1 = awaitify(whilst, 3);
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/**
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* Repeatedly call `iteratee` until `test` returns `true`. Calls `callback` when
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* stopped, or an error occurs. `callback` will be passed an error and any
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* arguments passed to the final `iteratee`'s callback.
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*
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* The inverse of [whilst]{@link module:ControlFlow.whilst}.
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*
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* @name until
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @see [async.whilst]{@link module:ControlFlow.whilst}
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* @category Control Flow
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* @param {AsyncFunction} test - asynchronous truth test to perform before each
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* execution of `iteratee`. Invoked with (callback).
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* @param {AsyncFunction} iteratee - An async function which is called each time
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* `test` fails. Invoked with (callback).
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* @param {Function} [callback] - A callback which is called after the test
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* function has passed and repeated execution of `iteratee` has stopped. `callback`
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* will be passed an error and any arguments passed to the final `iteratee`'s
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* callback. Invoked with (err, [results]);
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* @returns {Promise} a promise, if a callback is not passed
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*
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* @example
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* const results = []
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* let finished = false
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* async.until(function test(cb) {
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* cb(null, finished)
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* }, function iter(next) {
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* fetchPage(url, (err, body) => {
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* if (err) return next(err)
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* results = results.concat(body.objects)
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* finished = !!body.next
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* next(err)
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* })
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* }, function done (err) {
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* // all pages have been fetched
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* })
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*/
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function until(test, iteratee, callback) {
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const _test = wrapAsync(test);
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return whilst$1((cb) => _test((err, truth) => cb (err, !truth)), iteratee, callback);
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}
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/**
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* Runs the `tasks` array of functions in series, each passing their results to
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* the next in the array. However, if any of the `tasks` pass an error to their
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* own callback, the next function is not executed, and the main `callback` is
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* immediately called with the error.
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*
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* @name waterfall
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* @static
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* @memberOf module:ControlFlow
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* @method
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* @category Control Flow
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* @param {Array} tasks - An array of [async functions]{@link AsyncFunction}
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* to run.
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* Each function should complete with any number of `result` values.
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* The `result` values will be passed as arguments, in order, to the next task.
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* @param {Function} [callback] - An optional callback to run once all the
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* functions have completed. This will be passed the results of the last task's
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* callback. Invoked with (err, [results]).
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* @returns {Promise} a promise, if a callback is omitted
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* @example
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*
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* async.waterfall([
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* function(callback) {
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* callback(null, 'one', 'two');
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* },
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* function(arg1, arg2, callback) {
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* // arg1 now equals 'one' and arg2 now equals 'two'
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* callback(null, 'three');
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* },
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* function(arg1, callback) {
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* // arg1 now equals 'three'
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* callback(null, 'done');
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* }
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* ], function (err, result) {
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* // result now equals 'done'
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* });
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*
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* // Or, with named functions:
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* async.waterfall([
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* myFirstFunction,
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* mySecondFunction,
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* myLastFunction,
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* ], function (err, result) {
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* // result now equals 'done'
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* });
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* function myFirstFunction(callback) {
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* callback(null, 'one', 'two');
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* }
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* function mySecondFunction(arg1, arg2, callback) {
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* // arg1 now equals 'one' and arg2 now equals 'two'
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* callback(null, 'three');
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* }
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* function myLastFunction(arg1, callback) {
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* // arg1 now equals 'three'
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* callback(null, 'done');
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* }
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*/
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function waterfall (tasks, callback) {
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callback = once(callback);
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if (!Array.isArray(tasks)) return callback(new Error('First argument to waterfall must be an array of functions'));
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if (!tasks.length) return callback();
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var taskIndex = 0;
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function nextTask(args) {
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var task = wrapAsync(tasks[taskIndex++]);
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task(...args, onlyOnce(next));
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}
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function next(err, ...args) {
|
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if (err === false) return
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if (err || taskIndex === tasks.length) {
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return callback(err, ...args);
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}
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nextTask(args);
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}
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nextTask([]);
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}
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var waterfall$1 = awaitify(waterfall);
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|
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/**
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* An "async function" in the context of Async is an asynchronous function with
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* a variable number of parameters, with the final parameter being a callback.
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* (`function (arg1, arg2, ..., callback) {}`)
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* The final callback is of the form `callback(err, results...)`, which must be
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* called once the function is completed. The callback should be called with a
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* Error as its first argument to signal that an error occurred.
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* Otherwise, if no error occurred, it should be called with `null` as the first
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* argument, and any additional `result` arguments that may apply, to signal
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* successful completion.
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* The callback must be called exactly once, ideally on a later tick of the
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* JavaScript event loop.
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*
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* This type of function is also referred to as a "Node-style async function",
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* or a "continuation passing-style function" (CPS). Most of the methods of this
|
|
* library are themselves CPS/Node-style async functions, or functions that
|
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* return CPS/Node-style async functions.
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|
*
|
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* Wherever we accept a Node-style async function, we also directly accept an
|
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* [ES2017 `async` function]{@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function}.
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* In this case, the `async` function will not be passed a final callback
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* argument, and any thrown error will be used as the `err` argument of the
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* implicit callback, and the return value will be used as the `result` value.
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* (i.e. a `rejected` of the returned Promise becomes the `err` callback
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* argument, and a `resolved` value becomes the `result`.)
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*
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* Note, due to JavaScript limitations, we can only detect native `async`
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* functions and not transpilied implementations.
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* Your environment must have `async`/`await` support for this to work.
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* (e.g. Node > v7.6, or a recent version of a modern browser).
|
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* If you are using `async` functions through a transpiler (e.g. Babel), you
|
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* must still wrap the function with [asyncify]{@link module:Utils.asyncify},
|
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* because the `async function` will be compiled to an ordinary function that
|
|
* returns a promise.
|
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*
|
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* @typedef {Function} AsyncFunction
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* @static
|
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*/
|
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|
|
|
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var index = {
|
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apply,
|
|
applyEach,
|
|
applyEachSeries,
|
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asyncify,
|
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auto,
|
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autoInject,
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cargo: cargo$1,
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cargoQueue: cargo,
|
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compose,
|
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concat: concat$1,
|
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concatLimit: concatLimit$1,
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concatSeries: concatSeries$1,
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constant: constant$1,
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detect: detect$1,
|
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detectLimit: detectLimit$1,
|
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detectSeries: detectSeries$1,
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dir,
|
|
doUntil,
|
|
doWhilst: doWhilst$1,
|
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each,
|
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eachLimit: eachLimit$1,
|
|
eachOf: eachOf$1,
|
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eachOfLimit: eachOfLimit$1,
|
|
eachOfSeries: eachOfSeries$1,
|
|
eachSeries: eachSeries$1,
|
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ensureAsync,
|
|
every: every$1,
|
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everyLimit: everyLimit$1,
|
|
everySeries: everySeries$1,
|
|
filter: filter$1,
|
|
filterLimit: filterLimit$1,
|
|
filterSeries: filterSeries$1,
|
|
forever: forever$1,
|
|
groupBy,
|
|
groupByLimit: groupByLimit$1,
|
|
groupBySeries,
|
|
log,
|
|
map: map$1,
|
|
mapLimit: mapLimit$1,
|
|
mapSeries: mapSeries$1,
|
|
mapValues,
|
|
mapValuesLimit: mapValuesLimit$1,
|
|
mapValuesSeries,
|
|
memoize,
|
|
nextTick,
|
|
parallel,
|
|
parallelLimit,
|
|
priorityQueue,
|
|
queue,
|
|
race: race$1,
|
|
reduce: reduce$1,
|
|
reduceRight,
|
|
reflect,
|
|
reflectAll,
|
|
reject: reject$1,
|
|
rejectLimit: rejectLimit$1,
|
|
rejectSeries: rejectSeries$1,
|
|
retry,
|
|
retryable,
|
|
seq,
|
|
series,
|
|
setImmediate: setImmediate$1,
|
|
some: some$1,
|
|
someLimit: someLimit$1,
|
|
someSeries: someSeries$1,
|
|
sortBy: sortBy$1,
|
|
timeout,
|
|
times,
|
|
timesLimit,
|
|
timesSeries,
|
|
transform,
|
|
tryEach: tryEach$1,
|
|
unmemoize,
|
|
until,
|
|
waterfall: waterfall$1,
|
|
whilst: whilst$1,
|
|
|
|
// aliases
|
|
all: every$1,
|
|
allLimit: everyLimit$1,
|
|
allSeries: everySeries$1,
|
|
any: some$1,
|
|
anyLimit: someLimit$1,
|
|
anySeries: someSeries$1,
|
|
find: detect$1,
|
|
findLimit: detectLimit$1,
|
|
findSeries: detectSeries$1,
|
|
flatMap: concat$1,
|
|
flatMapLimit: concatLimit$1,
|
|
flatMapSeries: concatSeries$1,
|
|
forEach: each,
|
|
forEachSeries: eachSeries$1,
|
|
forEachLimit: eachLimit$1,
|
|
forEachOf: eachOf$1,
|
|
forEachOfSeries: eachOfSeries$1,
|
|
forEachOfLimit: eachOfLimit$1,
|
|
inject: reduce$1,
|
|
foldl: reduce$1,
|
|
foldr: reduceRight,
|
|
select: filter$1,
|
|
selectLimit: filterLimit$1,
|
|
selectSeries: filterSeries$1,
|
|
wrapSync: asyncify,
|
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during: whilst$1,
|
|
doDuring: doWhilst$1
|
|
};
|
|
|
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export { every$1 as all, everyLimit$1 as allLimit, everySeries$1 as allSeries, some$1 as any, someLimit$1 as anyLimit, someSeries$1 as anySeries, apply, applyEach, applyEachSeries, asyncify, auto, autoInject, cargo$1 as cargo, cargo as cargoQueue, compose, concat$1 as concat, concatLimit$1 as concatLimit, concatSeries$1 as concatSeries, constant$1 as constant, index as default, detect$1 as detect, detectLimit$1 as detectLimit, detectSeries$1 as detectSeries, dir, doWhilst$1 as doDuring, doUntil, doWhilst$1 as doWhilst, whilst$1 as during, each, eachLimit$1 as eachLimit, eachOf$1 as eachOf, eachOfLimit$1 as eachOfLimit, eachOfSeries$1 as eachOfSeries, eachSeries$1 as eachSeries, ensureAsync, every$1 as every, everyLimit$1 as everyLimit, everySeries$1 as everySeries, filter$1 as filter, filterLimit$1 as filterLimit, filterSeries$1 as filterSeries, detect$1 as find, detectLimit$1 as findLimit, detectSeries$1 as findSeries, concat$1 as flatMap, concatLimit$1 as flatMapLimit, concatSeries$1 as flatMapSeries, reduce$1 as foldl, reduceRight as foldr, each as forEach, eachLimit$1 as forEachLimit, eachOf$1 as forEachOf, eachOfLimit$1 as forEachOfLimit, eachOfSeries$1 as forEachOfSeries, eachSeries$1 as forEachSeries, forever$1 as forever, groupBy, groupByLimit$1 as groupByLimit, groupBySeries, reduce$1 as inject, log, map$1 as map, mapLimit$1 as mapLimit, mapSeries$1 as mapSeries, mapValues, mapValuesLimit$1 as mapValuesLimit, mapValuesSeries, memoize, nextTick, parallel, parallelLimit, priorityQueue, queue, race$1 as race, reduce$1 as reduce, reduceRight, reflect, reflectAll, reject$1 as reject, rejectLimit$1 as rejectLimit, rejectSeries$1 as rejectSeries, retry, retryable, filter$1 as select, filterLimit$1 as selectLimit, filterSeries$1 as selectSeries, seq, series, setImmediate$1 as setImmediate, some$1 as some, someLimit$1 as someLimit, someSeries$1 as someSeries, sortBy$1 as sortBy, timeout, times, timesLimit, timesSeries, transform, tryEach$1 as tryEach, unmemoize, until, waterfall$1 as waterfall, whilst$1 as whilst, asyncify as wrapSync };
|