From 944b99d1add5800d247f0f4f1c14663e0420ea5c Mon Sep 17 00:00:00 2001
From: Thomas Rupprecht <rupprecht.thomas@gmail.com>
Date: Wed, 28 Aug 2019 21:50:30 +0200
Subject: [PATCH] check for online/offline events if fetching should be enabled

---
 background/index.js | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/background/index.js b/background/index.js
index 51eeea8..ce35152 100644
--- a/background/index.js
+++ b/background/index.js
@@ -57,7 +57,29 @@ const fetchNewData = () => {
   });
 };
 
-fetchNewData();
-setInterval(() => {
+let intervalHandler = null;
+
+const stopFetching = () => {
+  if (intervalHandler !== null) {
+    clearInterval(intervalHandler);
+    intervalHandler = null;
+  }
+};
+const startFetching = () => {
   fetchNewData();
-}, Config.refreshTimeout);
\ No newline at end of file
+  if (intervalHandler === null) {
+    intervalHandler = setInterval(() => {
+      fetchNewData();
+    }, Config.refreshTimeout);
+  }
+};
+
+window.addEventListener('offline', () => {
+  stopFetching();
+});
+window.addEventListener('online', () => {
+  startFetching();
+});
+if (window.navigator.onLine) {
+  startFetching();
+}