FM / async

/usr/lib/node_modules/pm2/node_modules/async/

/usr/lib/node_modules/pm2/node_modules/async

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dist/	-	0755	rm
internal/	-	0755	rm
all.js	1838	0644	edit dl rm
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asyncify.js	3730	0644	edit dl rm
auto.js	9336	0644	edit dl rm
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parallel.js	3174	0644	edit dl rm
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wrapSync.js	3730	0644	edit dl rm

Edit: /usr/lib/node_modules/pm2/node_modules/async/auto.js (9336B)

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
exports.default = auto;

var _once = require('./internal/once');

var _once2 = _interopRequireDefault(_once);

var _onlyOnce = require('./internal/onlyOnce');

var _onlyOnce2 = _interopRequireDefault(_onlyOnce);

var _wrapAsync = require('./internal/wrapAsync');

var _wrapAsync2 = _interopRequireDefault(_wrapAsync);

var _promiseCallback = require('./internal/promiseCallback');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * 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
 *
 * async.auto({
 *     // this function will just be passed a callback
 *     readData: async.apply(fs.readFile, 'data.txt', 'utf-8'),
 *     showData: ['readData', function(results, cb) {
 *         // results.readData is the file's contents
 *         // ...
 *     }]
 * }, callback);
 *
 * async.auto({
 *     get_data: function(callback) {
 *         console.log('in get_data');
 *         // async code to get some data
 *         callback(null, 'data', 'converted to array');
 *     },
 *     make_folder: function(callback) {
 *         console.log('in make_folder');
 *         // async code to create a directory to store a file in
 *         // this is run at the same time as getting the data
 *         callback(null, 'folder');
 *     },
 *     write_file: ['get_data', 'make_folder', function(results, callback) {
 *         console.log('in write_file', JSON.stringify(results));
 *         // once there is some data and the directory exists,
 *         // write the data to a file in the directory
 *         callback(null, 'filename');
 *     }],
 *     email_link: ['write_file', function(results, callback) {
 *         console.log('in email_link', JSON.stringify(results));
 *         // once the file is written let's email a link to it...
 *         // results.write_file contains the filename returned by write_file.
 *         callback(null, {'file':results.write_file, 'email':'user@example.com'});
 *     }]
 * }, function(err, results) {
 *     console.log('err = ', err);
 *     console.log('results = ', results);
 * });
 */
function auto(tasks, concurrency, callback) {
    if (typeof concurrency !== 'number') {
        // concurrency is optional, shift the args.
        callback = concurrency;
        concurrency = null;
    }
    callback = (0, _once2.default)(callback || (0, _promiseCallback.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 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;

runningTasks++;
        var taskFn = (0, _wrapAsync2.default)(task[task.length - 1]);
        if (task.length > 1) {
            taskFn(results, taskCallback);
        } else {
            taskFn(taskCallback);
        }
    }

if (counter !== numTasks) {
            throw new Error('async.auto cannot execute tasks due to a recursive dependency');
        }
    }

return callback[_promiseCallback.PROMISE_SYMBOL];
}
module.exports = exports['default'];

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