108 lines
3.4 KiB
JavaScript
108 lines
3.4 KiB
JavaScript
const Logger = require('../lib/utils/logger');
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const config = require('../config');
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const fs = require('fs');
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const redis = require('redis');
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const { Worker, workerData, parentPort } = require('worker_threads');
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const path = require('path');
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const { execSync } = require("child_process");
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const jobId = workerData;
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const logger = new Logger('presAnn Collector');
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logger.info("Collecting job " + jobId);
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const kickOffProcessWorker = (jobId) => {
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return new Promise((resolve, reject) => {
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const worker = new Worker('./workers/process.js', { workerData: jobId });
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worker.on('message', resolve);
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worker.on('error', reject);
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worker.on('exit', (code) => {
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if (code !== 0)
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reject(new Error(`PresAnn Process Worker stopped with exit code ${code}`));
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})
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})
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}
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const dropbox = path.join(config.shared.presAnnDropboxDir, jobId);
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// Takes the Job from the dropbox
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let job = fs.readFileSync(path.join(dropbox, 'job'));
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let exportJob = JSON.parse(job);
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// Collect the annotations from Redis
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(async () => {
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const client = redis.createClient({
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host: config.redis.host,
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port: config.redis.port,
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password: config.redis.password
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});
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client.on('error', (err) => logger.info('Redis Client Error', err));
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await client.connect();
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let presAnn = await client.hGetAll(exportJob.jobId);
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// Remove annotations from Redis
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await client.DEL(jobId);
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client.disconnect();
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let annotations = JSON.stringify(presAnn);
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let whiteboard = JSON.parse(annotations);
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let pages = JSON.parse(whiteboard.pages);
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fs.writeFile(path.join(dropbox, 'whiteboard'), annotations, function(err) {
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if(err) { return logger.error(err); }
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});
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// Collect the Presentation Page files (PDF / PNG / JPEG) from the presentation directory
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let presentationFile = path.join(exportJob.presLocation, exportJob.presId);
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let pdfFile = `${presentationFile}.pdf`
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if (fs.existsSync(pdfFile)) {
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for (let p of pages) {
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let pageNumber = p.page;
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let outputFile = path.join(dropbox, `slide${pageNumber}`);
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// CairoSVG doesn't handle transparent SVG and PNG embeds properly, e.g., in rasterized text.
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// So textboxes may get a black background when downloading/exporting repeatedly.
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// To avoid that, we take slides from the uploaded file, but later probe the dimensions from the SVG
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// so it matches what was shown in the browser.
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let extract_png_from_pdf = [
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'pdftocairo',
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'-png',
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'-f', pageNumber,
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'-l', pageNumber,
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'-scale-to', config.collector.pngWidthRasterizedSlides,
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'-singlefile',
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'-cropbox',
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pdfFile, outputFile,
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].join(' ')
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execSync(extract_png_from_pdf);
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}
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}
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// If PNG file already available
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else if (fs.existsSync(`${presentationFile}.png`)) {
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fs.copyFileSync(`${presentationFile}.png`, path.join(dropbox, 'slide1.png'));
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}
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// If JPEG file available
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else if (fs.existsSync(`${presentationFile}.jpeg`)) {
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fs.copyFileSync(`${presentationFile}.jpeg`, path.join(dropbox, 'slide1.jpeg'));
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}
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else {
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return logger.error(`Could not find whiteboard presentation file for job ${exportJob.jobId}`);
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}
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kickOffProcessWorker(exportJob.jobId);
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})()
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parentPort.postMessage({ message: workerData })
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