Add caching to tracking results

endpoints/logistics.tracking.php

@@ -2,17 +2,32 @@
 
 $trackinginfo;
 
+$code = $VARS["code"];
+$carrier = "";
+if (!empty($VARS["carrier"])) {
+    $carrier = $VARS["carrier"];
+}
+
 try {
-    if (!empty($VARS["carrier"])) {
-        $trackinginfo = Tracking::track($VARS["code"], $VARS["carrier"]);
-    } else {
-        $trackinginfo = Tracking::track($VARS["code"]);
+    $cacheresp = $memcache->get("logistics.tracking.$code.$carrier");
+    if ($cacheresp !== false && empty($VARS["nocache"])) {
+        exitWithJson(json_decode($cacheresp, true));
     }
+
+    $trackinginfo = Tracking::track($code, $carrier);
 } catch (TrackingException $ex) {
-    sendJsonResp($ex->getMessage(), "ERROR");
+    $output = [
+        "status" => "ERROR",
+        "msg" => $ex->getMessage()
+    ];
+    $memcache->set("logistics.tracking.$code.$carrier", json_encode($output), 60 * 10);
+    exitWithJson($output);
 }
 
 if (is_null($trackinginfo)) {
     sendJsonResp("Could not find any results for that tracking code.", "ERROR");
 }
-exitWithJson($trackinginfo->toObject());
+
+$output = $trackinginfo->toObject();
+$memcache->set("logistics.tracking.$code.$carrier", json_encode($output), 60 * 60);
+exitWithJson($output);