51 lines
1.6 KiB
JavaScript
51 lines
1.6 KiB
JavaScript
const workerState = require('./workerState');
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const utils = require('./utils');
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const fs = require('fs-extra');
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const util = require('util');
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const stream = require('stream');
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const pipeline = util.promisify(stream.pipeline);
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const download = require('download');
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class ReaderWorker {
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constructor(config) {
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this.config = Object.assign({}, config);
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this.config.tempDownloadDir = `${config.tempDir}/download`;
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fs.ensureDirSync(this.config.tempDownloadDir);
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}
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async loadBook(url, wState) {
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const maxDownloadSize = 10*1024*1024;
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let errMes = '';
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try {
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wState.set({state: 'download', step: 1, totalSteps: 3, url});
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const tempFilename = utils.randomHexString(30);
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const d = download(url);
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d.on('downloadProgress', progress => {
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wState.set({progress: Math.round(progress.percent*100)});
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if (progress.transferred > maxDownloadSize) {
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errMes = 'file too big';
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d.destroy();
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}
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});
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await pipeline(d, fs.createWriteStream(`${this.config.tempDownloadDir}/${tempFilename}`));
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wState.finish({step: 3, file: tempFilename});
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} catch (e) {
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wState.set({state: 'error', error: (errMes ? errMes : e.message)});
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}
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}
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loadBookUrl(url) {
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const workerId = workerState.generateWorkerId();
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const wState = workerState.getControl(workerId);
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wState.set({state: 'start'});
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this.loadBook(url, wState);
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return workerId;
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}
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}
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module.exports = ReaderWorker; |