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