Fix error when fetching UV index

endpoints/gis.weather.php

@@ -160,9 +160,15 @@ if ($geocode["status"] == "OK") {
     $city = $geocode["address"]["city"];
     $state = $geocode["address"]["state"];
     try {
-        $epa_url = "https://enviro.epa.gov/enviro/efservice/getEnvirofactsUVHOURLY/CITY/$city/STATE/$state/JSON";
-
-        $epa_data = json_decode(ApiFetcher::get($epa_url), true);
+        $epauv = $memcache->get("gis.weather.epauv.$state.$city");
+        if ($epauv !== false) {
+            $epa_data = json_decode($epauv, true);
+        } else {
+            $epa_url = "https://enviro.epa.gov/enviro/efservice/getEnvirofactsUVHOURLY/CITY/$city/STATE/$state/JSON";
+            $epa_json = file_get_contents($epa_url);
+            $epa_data = json_decode($epa_json, true);
+            $memcache->set("gis.weather.epauv.$state.$city", $epa_json, 60 * 60 * 4);
+        }
 
         // Find which returned result is closest to the current date and time
         $closest = $epa_data[0];