98 lines
2.4 KiB
JavaScript
98 lines
2.4 KiB
JavaScript
// matrix-puppeteer-line - A very hacky Matrix-LINE bridge based on running LINE's Chrome extension in Puppeteer
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// Copyright (C) 2020-2022 Tulir Asokan, Andrew Ferrazzutti
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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export default class TaskQueue {
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constructor(id) {
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this.id = id
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this._tasks = []
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this.running = false
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this._wakeup = null
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}
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log(...text) {
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console.log(`[TaskQueue/${this.id}]`, ...text)
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}
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error(...text) {
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console.error(`[TaskQueue/${this.id}]`, ...text)
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}
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async _run() {
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this.log("Started processing tasks")
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while (this.running) {
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if (this._tasks.length === 0) {
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this.log("Sleeping until a new task is received")
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await new Promise(resolve => this._wakeup = () => {
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resolve()
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this._wakeup = null
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})
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if (!this.running) {
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break
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}
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this.log("Continuing processing tasks")
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}
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const { task, resolve, reject } = this._tasks.shift()
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await task().then(resolve, reject)
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}
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this.log("Stopped processing tasks")
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}
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/**
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* @callback Task
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* @return {Promise<any>}
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*/
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/**
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* Push a task to the queue.
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*
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* @param {Task} task - The task to run
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* @return {Promise<any>} - A promise that resolves to the return value of the task
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*/
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push(task) {
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if (!this.running) {
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throw Error("task queue is not running")
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}
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if (this._wakeup !== null) {
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this._wakeup()
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}
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return new Promise((resolve, reject) => this._tasks.push({ task, resolve, reject }))
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}
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/**
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* Start handling tasks
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*/
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start() {
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if (this.running) {
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return
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}
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this.running = true
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this._run().catch(err => this.error("Fatal error processing tasks:", err))
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}
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/**
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* Stop handling tasks.
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*/
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stop() {
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if (!this.running) {
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return
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}
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this.running = false
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if (this._wakeup !== null) {
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this._wakeup()
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}
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}
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}
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