Enabled puppeteer cluster

print/core/report.js

@@ -2,7 +2,7 @@ const fs = require('fs');
 const path = require('path');
 const config = require('./config');
 const Component = require('./component');
-const puppeteer = require('puppeteer');
+const Cluster = require('./cluster');
 
 if (!process.env.OPENSSL_CONF)
     process.env.OPENSSL_CONF = '/etc/ssl/';
@@ -32,17 +32,8 @@ class Report extends Component {
         if (fs.existsSync(fullPath))
             options = require(optionsPath);
 
-        const browser = await puppeteer.launch({
-            headless: true,
-            args: [
-                '--no-sandbox',
-                '--disable-setuid-sandbox',
-                '--single-process',
-                '--no-zygote'
-            ]
-        });
-
-        const page = (await browser.pages())[0];
+        return new Promise(resolve => {
+            Cluster.pool.queue({}, async({page}) => {
                 await page.emulateMediaType('screen');
                 await page.setContent(template);
 
@@ -60,11 +51,11 @@ class Report extends Component {
                 options.headerTemplate = '\n';
                 options.footerTemplate = footer;
 
-        const buffer = await page.pdf(options);
+                const stream = await page.pdf(options);
 
-        await browser.close();
-
-        return buffer;
+                resolve(stream);
+            });
+        });
     }
 
     /**