[ssr] disable even for bots, if en and period of high load

nuxt.config.js

@@ -12,6 +12,8 @@ const description = translations.description;
 const banner = process.env.BASE_URL + '/api/banner/zaimki.png';
 const colour = '#C71585';
 
+process.env.LOCALE = locale;
+
 const bodyParser = require('body-parser');
 
 const buildFlags = () => {

server/no-ssr.js

@@ -11,7 +11,27 @@ const isBrowser = (userAgent) => {
     return isProbablyBrowser || !isProbablyBot;
 }
 
-export default function(req, res, next) {
-    res.spa = process.env.NODE_ENV === 'production' && isBrowser(req.headers['user-agent']);
-    next()
+const overload = {
+    en: [[17, 23]],
+};
+
+const isHighLoad = (timestamp, overloadPeriods) => {
+    if (overloadPeriods === undefined) {
+        return false;
+    }
+
+    for (let [periodStart, periodEnd] of overloadPeriods) {
+        if (timestamp.getUTCHours() >= periodStart && timestamp.getUTCHours() < periodEnd) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
+export default function(req, res, next) {
+    if (process.env.NODE_ENV === 'production') {
+        res.spa = isBrowser(req.headers['user-agent']) || isHighLoad(new Date, overload[process.env.LOCALE]);
+    }
+    next();
 }