94 lines
3.3 KiB
JavaScript
94 lines
3.3 KiB
JavaScript
const workerState = require('./workerState');
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const FileDetector = require('./FileDetector');
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const FileDecompressor = require('./FileDecompressor');
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const BookConverter = require('./BookConverter');
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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 = `${config.tempDir}/download`;
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fs.ensureDirSync(this.config.tempDownloadDir);
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this.config.tempPublicDir = `${config.publicDir}/tmp`;
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fs.ensureDirSync(this.config.tempPublicDir);
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this.detector = new FileDetector();
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this.decomp = new FileDecompressor();
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this.bookConverter = new BookConverter();
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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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let decompDir = '';
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let downloadedFilename = '';
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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 tempFilename2 = utils.randomHexString(30);
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const decompDirname = utils.randomHexString(30);
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//download
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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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downloadedFilename = `${this.config.tempDownloadDir}/${tempFilename}`;
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await pipeline(d, fs.createWriteStream(downloadedFilename));
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//decompress
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wState.set({state: 'decompress', step: 2, progress: 0});
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decompDir = `${this.config.tempDownloadDir}/${decompDirname}`;
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const decompFilename = await this.decomp.decompressFile(downloadedFilename, decompDir);
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wState.set({progress: 100});
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//parse book
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wState.set({state: 'parse', step: 3, progress: 0});
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const fileType = await this.detector.detectFile(decompFilename);
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fileType.url = url;
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let resultFilename = `${this.config.tempPublicDir}/${tempFilename2}`;
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await this.bookConverter.convertToFb2(decompFilename, resultFilename, fileType, progress => {
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wState.set({progress});
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});
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wState.set({progress: 100});
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//finish
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wState.finish({path: `/tmp/${tempFilename2}`});
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} catch (e) {
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wState.set({state: 'error', error: (errMes ? errMes : e.message)});
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} finally {
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//clean
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if (decompDir)
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await fs.remove(decompDir);
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if (downloadedFilename)
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await fs.remove(downloadedFilename);
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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; |