178 lines
5 KiB
JavaScript
178 lines
5 KiB
JavaScript
/**
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* @module run-tasks-in-parallel
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* @author Toru Nagashima
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* @copyright 2015 Toru Nagashima. All rights reserved.
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* See LICENSE file in root directory for full license.
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*/
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"use strict"
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const MemoryStream = require("memorystream")
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const NpmRunAllError = require("./npm-run-all-error")
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const runTask = require("./run-task")
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Remove the given value from the array.
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* @template T
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* @param {T[]} array - The array to remove.
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* @param {T} x - The item to be removed.
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* @returns {void}
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*/
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function remove(array, x) {
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const index = array.indexOf(x)
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if (index !== -1) {
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array.splice(index, 1)
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}
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}
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//------------------------------------------------------------------------------
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// Public Interface
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//------------------------------------------------------------------------------
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/**
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* Run npm-scripts of given names in parallel.
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*
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* If a npm-script exited with a non-zero code, this aborts other all npm-scripts.
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*
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* @param {string} tasks - A list of npm-script name to run in parallel.
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* @param {object} options - An option object.
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* @returns {Promise} A promise object which becomes fullfilled when all npm-scripts are completed.
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* @private
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*/
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module.exports = function runTasks(tasks, options) {
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return new Promise((resolve, reject) => {
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if (tasks.length === 0) {
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resolve([])
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return
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}
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const results = tasks.map(task => ({ name: task, code: undefined }))
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const queue = tasks.map((task, index) => ({ name: task, index }))
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const promises = []
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let error = null
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let aborted = false
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/**
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* Done.
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* @returns {void}
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*/
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function done() {
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if (error == null) {
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resolve(results)
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}
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else {
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reject(error)
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}
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}
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/**
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* Aborts all tasks.
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* @returns {void}
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*/
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function abort() {
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if (aborted) {
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return
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}
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aborted = true
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if (promises.length === 0) {
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done()
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}
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else {
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for (const p of promises) {
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p.abort()
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}
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Promise.all(promises).then(done, reject)
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}
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}
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/**
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* Runs a next task.
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* @returns {void}
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*/
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function next() {
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if (aborted) {
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return
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}
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if (queue.length === 0) {
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if (promises.length === 0) {
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done()
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}
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return
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}
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const originalOutputStream = options.stdout
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const optionsClone = Object.assign({}, options)
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const writer = new MemoryStream(null, {
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readable: false,
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})
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if (options.aggregateOutput) {
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optionsClone.stdout = writer
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}
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const task = queue.shift()
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const promise = runTask(task.name, optionsClone)
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promises.push(promise)
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promise.then(
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(result) => {
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remove(promises, promise)
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if (aborted) {
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return
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}
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if (options.aggregateOutput) {
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originalOutputStream.write(writer.toString())
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}
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// Save the result.
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results[task.index].code = result.code
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// Aborts all tasks if it's an error.
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if (result.code) {
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error = new NpmRunAllError(result, results)
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if (!options.continueOnError) {
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abort()
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return
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}
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}
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// Aborts all tasks if options.race is true.
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if (options.race && !result.code) {
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abort()
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return
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}
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// Call the next task.
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next()
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},
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(thisError) => {
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remove(promises, promise)
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if (!options.continueOnError || options.race) {
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error = thisError
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abort()
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return
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}
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next()
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}
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)
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}
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const max = options.maxParallel
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const end = (typeof max === "number" && max > 0)
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? Math.min(tasks.length, max)
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: tasks.length
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for (let i = 0; i < end; ++i) {
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next()
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}
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})
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}
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