added cache invalidation

main.go

@@ -81,6 +81,17 @@ func getCachedUpdates(feedURL string) ([]Update, error) {
 	return updates, nil
 }
 
+func invalidateCache(w http.ResponseWriter, r *http.Request) {
+	cacheMu.Lock()
+	defer cacheMu.Unlock()
+
+	cachedUpdates = nil
+	cacheExpiry = time.Time{} // zero time to force refresh on next request
+
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte("Cache invalidated\n"))
+}
+
 func updatesHandler(w http.ResponseWriter, r *http.Request) {
 	const feedURL = "https://steamdb.info/api/PatchnotesRSS/?appid=1874880"
 
@@ -98,7 +109,9 @@ func updatesHandler(w http.ResponseWriter, r *http.Request) {
 
 func main() {
 	http.HandleFunc("/updates", updatesHandler)
-	log.Println("Listening on http://localhost:8080/updates")
+	http.HandleFunc("/invalidate-cache", invalidateCache)
+
+	log.Println("Listening on http://localhost:8080/")
 	log.Fatal(http.ListenAndServe(":8080", nil))
 }