48 lines
1.1 KiB
JavaScript
48 lines
1.1 KiB
JavaScript
'use strict';
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const debug = require('debug')('box:asynctask'),
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EventEmitter = require('events'),
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safe = require('safetydance');
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// this runs in-process
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class AsyncTask extends EventEmitter {
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name;
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#abortController;
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constructor(name) {
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super();
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this.name = name;
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this.#abortController = new AbortController();
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}
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async _run(/*signal*/) {
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// subclasses implement this
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}
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async start() {
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debug(`start: ${this.name} started`);
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const [error] = await safe(this._run(this.#abortController.signal)); // background
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debug(`start: ${this.name} finished`);
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this.emit('done', { errorMessage: error?.message || '' });
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this.#abortController = null;
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}
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stop() {
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if (this.#abortController === null) return; // already finished
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debug(`stop: ${this.name} . sending abort signal`);
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this.#abortController.abort();
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}
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emitProgress(percent, message) {
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this.emit('data', 'progress', { percent, message });
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}
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emitData(obj) {
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this.emit('data', 'data', obj);
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}
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}
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exports = module.exports = {
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AsyncTask
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};
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