273 lines
10 KiB
JavaScript
273 lines
10 KiB
JavaScript
const fs = require('fs-extra');
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const path = require('path');
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const LimitedQueue = require('../LimitedQueue');
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const WorkerState = require('../WorkerState');//singleton
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const FileDownloader = require('../FileDownloader');
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const FileDecompressor = require('../FileDecompressor');
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const BookConverter = require('./BookConverter');
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const RemoteWebDavStorage = require('../RemoteWebDavStorage');
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const utils = require('../utils');
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const log = new (require('../AppLogger'))().log;//singleton
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const cleanDirPeriod = 60*60*1000;//1 раз в час
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const queue = new LimitedQueue(5, 100, 5*60*1000);//5 минут ожидание подвижек
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let instance = null;
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//singleton
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class ReaderWorker {
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constructor(config) {
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if (!instance) {
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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.workerState = new WorkerState();
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this.down = new FileDownloader(config.maxUploadFileSize);
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this.decomp = new FileDecompressor(2*config.maxUploadFileSize);
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this.bookConverter = new BookConverter(this.config);
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this.remoteWebDavStorage = false;
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if (config.remoteWebDavStorage) {
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this.remoteWebDavStorage = new RemoteWebDavStorage(
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Object.assign({maxContentLength: config.maxUploadFileSize}, config.remoteWebDavStorage)
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);
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}
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this.periodicCleanDir(this.config.tempPublicDir, this.config.maxTempPublicDirSize, cleanDirPeriod);
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this.periodicCleanDir(this.config.uploadDir, this.config.maxUploadPublicDirSize, cleanDirPeriod);
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instance = this;
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}
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return instance;
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}
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async loadBook(opts, wState) {
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const url = opts.url;
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let decompDir = '';
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let downloadedFilename = '';
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let isUploaded = false;
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let convertFilename = '';
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const overLoadMes = 'Слишком большая очередь загрузки. Пожалуйста, попробуйте позже.';
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const overLoadErr = new Error(overLoadMes);
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let q = null;
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try {
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wState.set({state: 'queue', step: 1, totalSteps: 1});
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try {
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let qSize = 0;
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q = await queue.get((place) => {
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wState.set({place, progress: (qSize ? Math.round((qSize - place)/qSize*100) : 0)});
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if (!qSize)
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qSize = place;
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});
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} catch (e) {
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throw overLoadErr;
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}
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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 or use uploaded
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if (url.indexOf('file://') != 0) {//download
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const downdata = await this.down.load(url, (progress) => {
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wState.set({progress});
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}, q.abort);
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downloadedFilename = `${this.config.tempDownloadDir}/${tempFilename}`;
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await fs.writeFile(downloadedFilename, downdata);
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} else {//uploaded file
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downloadedFilename = `${this.config.uploadDir}/${url.substr(7)}`;
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if (!await fs.pathExists(downloadedFilename))
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throw new Error('Файл не найден на сервере (возможно был удален как устаревший). Пожалуйста, загрузите файл с диска на сервер заново.');
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await utils.touchFile(downloadedFilename);
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isUploaded = true;
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}
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wState.set({progress: 100});
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if (q.abort())
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throw overLoadErr;
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q.resetTimeout();
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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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let decompFiles = {};
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try {
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decompFiles = await this.decomp.decompressNested(downloadedFilename, decompDir);
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} catch (e) {
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log(LM_ERR, e.stack);
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throw new Error('Ошибка распаковки');
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}
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wState.set({progress: 100});
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if (q.abort())
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throw overLoadErr;
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q.resetTimeout();
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//конвертирование в fb2
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wState.set({state: 'convert', step: 3, progress: 0});
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convertFilename = `${this.config.tempDownloadDir}/${tempFilename2}`;
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await this.bookConverter.convertToFb2(decompFiles, convertFilename, opts, progress => {
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wState.set({progress});
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}, q.abort);
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//сжимаем файл в tmp, если там уже нет с тем же именем-sha256
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const compFilename = await this.decomp.gzipFileIfNotExists(convertFilename, this.config.tempPublicDir);
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const stat = await fs.stat(compFilename);
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wState.set({progress: 100});
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//finish
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const finishFilename = path.basename(compFilename);
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wState.finish({path: `/tmp/${finishFilename}`, size: stat.size});
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//лениво сохраним compFilename в удаленном хранилище
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if (this.remoteWebDavStorage) {
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(async() => {
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await utils.sleep(20*1000);
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try {
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//log(`remoteWebDavStorage.putFile ${path.basename(compFilename)}`);
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await this.remoteWebDavStorage.putFile(compFilename);
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} catch (e) {
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log(LM_ERR, e.stack);
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}
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})();
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}
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} catch (e) {
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log(LM_ERR, e.stack);
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if (e.message == 'abort')
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e.message = overLoadMes;
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wState.set({state: 'error', error: e.message});
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} finally {
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//clean
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if (q)
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q.ret();
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if (decompDir)
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await fs.remove(decompDir);
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if (downloadedFilename && !isUploaded)
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await fs.remove(downloadedFilename);
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if (convertFilename)
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await fs.remove(convertFilename);
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}
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}
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loadBookUrl(opts) {
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const workerId = this.workerState.generateWorkerId();
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const wState = this.workerState.getControl(workerId);
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wState.set({state: 'start'});
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this.loadBook(opts, wState);
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return workerId;
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}
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async saveFile(file) {
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const hash = await utils.getFileHash(file.path, 'sha256', 'hex');
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const outFilename = `${this.config.uploadDir}/${hash}`;
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if (!await fs.pathExists(outFilename)) {
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await fs.move(file.path, outFilename);
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} else {
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await utils.touchFile(outFilename);
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await fs.remove(file.path);
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}
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return `file://${hash}`;
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}
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restoreCachedFile(filename) {
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const workerId = this.workerState.generateWorkerId();
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const wState = this.workerState.getControl(workerId);
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wState.set({state: 'start'});
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(async() => {
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try {
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wState.set({state: 'download', step: 1, totalSteps: 1, path: filename, progress: 0});
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const basename = path.basename(filename);
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const targetName = `${this.config.tempPublicDir}/${basename}`;
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if (!await fs.pathExists(targetName)) {
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let found = false;
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if (this.remoteWebDavStorage) {
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found = await this.remoteWebDavStorage.getFileSuccess(targetName);
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}
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if (!found) {
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throw new Error('404 Файл не найден');
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}
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}
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const stat = await fs.stat(targetName);
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wState.finish({path: `/tmp/${basename}`, size: stat.size, progress: 100});
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} catch (e) {
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if (e.message.indexOf('404') < 0)
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log(LM_ERR, e.stack);
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wState.set({state: 'error', error: e.message});
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}
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})();
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return workerId;
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}
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async periodicCleanDir(dir, maxSize, timeout) {
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try {
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const list = await fs.readdir(dir);
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let size = 0;
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let files = [];
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for (const name of list) {
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const stat = await fs.stat(`${dir}/${name}`);
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if (!stat.isDirectory()) {
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size += stat.size;
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files.push({name, stat});
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}
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}
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log(`clean dir ${dir}, maxSize=${maxSize}, found ${files.length} files`);
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files.sort((a, b) => a.stat.mtimeMs - b.stat.mtimeMs);
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let i = 0;
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while (i < files.length && size > maxSize) {
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const file = files[i];
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const oldFile = `${dir}/${file.name}`;
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//отправляем только this.config.tempPublicDir
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//TODO: убрать в будущем, т.к. уже делается ленивое сохранение compFilename в удаленном хранилище
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if (this.remoteWebDavStorage && dir === this.config.tempPublicDir) {
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try {
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//log(`remoteWebDavStorage.putFile ${path.basename(oldFile)}`);
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await this.remoteWebDavStorage.putFile(oldFile);
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} catch (e) {
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log(LM_ERR, e.stack);
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}
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}
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await fs.remove(oldFile);
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size -= file.stat.size;
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i++;
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}
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log(`removed ${i} files`);
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} catch(e) {
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log(LM_ERR, e.stack);
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} finally {
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setTimeout(() => {
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this.periodicCleanDir(dir, maxSize, timeout);
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}, timeout);
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}
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}
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}
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module.exports = ReaderWorker; |