Added exclude list for PWA caching.

assets/data/cache-list.js

@@ -6,7 +6,7 @@
 # MIT Licensed
 ---
 
-var cacheList = [
+const include = [
 
   /*--- CSS ---*/
 
@@ -99,7 +99,6 @@ var cacheList = [
   /*--- Others ---*/
 
   {% if site.google_analytics.pv.enabled %}
-    '{{ "/assets/data/pv-data.json" | relative_url }}',
     '{{ "/assets/lib/countUp.min.js" | relative_url }}',
     '{{ "/assets/js/dist/pageviews.min.js" | relative_url }}',
   {% endif %}
@@ -110,3 +109,8 @@ var cacheList = [
   '{{ "/app.js" | relative_url }}',
   '{{ "/sw.js" | relative_url }}'
 ];
+
+const exclude = [
+  '/assets/data/pv-data.json',
+  '/img.shields.io/'
+];

sw.js

@@ -10,11 +10,22 @@ self.importScripts('{{ "/assets/data/cache-list.js" | relative_url }}');
 
 var cacheName = 'chirpy-{{ "now" | date: "%Y%m%d.%H%M" }}';
 
+
+function isExcluded(url) {
+  for (const rule of exclude) {
+    if (url.indexOf(rule) != -1) {
+      return true;
+    }
+  }
+  return false;
+}
+
+
 self.addEventListener('install', (e) => {
   self.skipWaiting();
   e.waitUntil(
     caches.open(cacheName).then((cache) => {
-      return cache.addAll(cacheList);
+      return cache.addAll(include);
     })
   );
 });
@@ -26,8 +37,10 @@ self.addEventListener('fetch', (e) => {
       /* console.log('[Service Worker] Fetching resource: ' + e.request.url); */
       return r || fetch(e.request).then((response) => {
         return caches.open(cacheName).then((cache) => {
+          if (!isExcluded(e.request.url)) {
             /* console.log('[Service Worker] Caching new resource: ' + e.request.url); */
             cache.put(e.request, response.clone());
+          }
           return response;
         });
       });