periodically refresh worker cache on index load

1 files changed, 15 insertions, 0 deletions

diff --git a/js/index.js b/js/index.js
index c5f8926..336232f 100644
--- a/js/index.js
+++ b/js/index.js
@@ -1,3 +1,18 @@
+function cache_refresh() {
+	if ('serviceWorker' in navigator) {
+		localforage.getItem("epube-cache.timestamp").then(function(stamp) {
+			var ts = parseInt(new Date().getTime()/1000);
+
+			if (!stamp || ts - stamp > 3600) {
+				console.log('asking worker to refresh cache');
+				navigator.serviceWorker.controller.postMessage("refresh-cache");
+				localforage.setItem("epube-cache.timestamp", ts);
+			}
+
+		});
+	}
+}
+
 function mark_offline(elem) {
 
 	var bookId = elem.getAttribute("data-book-id");