Show server response time on server details page

Author: carlbennett

src/controllers/Server/View.php

@@ -50,7 +50,12 @@ public function run(Router &$router) {
     }
 
     if ($model->server) {
-      $model->server_uptime = ServerMetric::getUptime($this->server_id);
+      $model->server_uptime = ServerMetric::getUptime(
+        $this->server_id
+      );
+      $model->server_response_time = ServerMetric::getLatestResponseTime(
+        $this->server_id
+      );
     }
 
     ob_start();

src/libraries/ServerMetric.php

@@ -15,10 +15,35 @@ class ServerMetric {
 
   const CACHE_UPTIME_TTL = 300;
 
+  public static function &getLatestResponseTime($server_id) {
+    $cache_key = "bnetdocs-servermetric-lastms-" . (int) $server_id;
+    $cache_val = Common::$cache->get($cache_key);
+    if ($cache_val !== false) return $cache_val;
+    if (!isset(Common::$database)) {
+      Common::$database = DatabaseDriver::getDatabaseObject();
+    }
+    $stmt = Common::$database->prepare("
+      SELECT `response_time`
+      FROM `server_metrics`
+      WHERE `server_id` = :server_id
+      ORDER BY `metric_datetime` DESC LIMIT 1;
+    ");
+    $stmt->bindParam(":server_id", $server_id, PDO::PARAM_INT);
+    $stmt->execute();
+    $obj = $stmt->fetch(PDO::FETCH_OBJ);
+    $stmt->closeCursor();
+    Common::$cache->set(
+      $cache_key,
+      $obj->response_time,
+      self::CACHE_UPTIME_TTL
+    );
+    return $obj->response_time;
+  }
+
   public static function &getUptime($server_id) {
     $cache_key = "bnetdocs-servermetric-uptime-" . (int) $server_id;
     $cache_val = Common::$cache->get($cache_key);
-    //if ($cache_val !== false) return unserialize($cache_val);
+    if ($cache_val !== false) return unserialize($cache_val);
     if (!isset(Common::$database)) {
       Common::$database = DatabaseDriver::getDatabaseObject();
     }

src/models/Server/View.php

@@ -8,17 +8,19 @@ class View extends Model {
 
   public $server;
   public $server_id;
+  public $server_response_time;
   public $server_type;
   public $server_uptime;
   public $user_session;
 
   public function __construct() {
     parent::__construct();
-    $this->server        = null;
-    $this->server_id     = null;
-    $this->server_type   = null;
-    $this->server_uptime = null;
-    $this->user_session  = null;
+    $this->server               = null;
+    $this->server_id            = null;
+    $this->server_response_time = null;
+    $this->server_type          = null;
+    $this->server_uptime        = null;
+    $this->user_session         = null;
   }
 
 }

src/templates/Server/View.phtml

@@ -20,6 +20,9 @@ $object_uptime = Common::intervalToString(
   "0 seconds"
 );
 
+$object_response_time = $this->getContext()->server_response_time * 1000;
+$object_response_time = sprintf("%.02fms", $object_response_time);
+
 $title       = ($object ? $object->getName() : "Server Not Found");
 $description = ($object ? "The BNETDocs Status Page for " . $object->getName()
   : "The requested server does not exist or could not be found.");
@@ -61,7 +64,7 @@ require("./header.inc.phtml");
             <tr><th>Address</th><td class="address" onclick="bnetdocs.fSelectText(this);"><?php echo filter_var($object->getAddress() . ":" . $object->getPort(), FILTER_SANITIZE_FULL_SPECIAL_CHARS); ?></td></tr>
             <tr><th>Owner</th><td><?php if ($object_user) { ?><a href="<?php echo $object_user_url; ?>"><img class="avatar" src="<?php echo $object_user_avatar; ?>"/> <?php echo filter_var($object_user->getName(), FILTER_SANITIZE_FULL_SPECIAL_CHARS); ?></a><?php } else { echo "Anonymous"; } ?></td></tr>
             <tr><th>Type</th><td><?php echo filter_var($object_type->getLabel(), FILTER_SANITIZE_FULL_SPECIAL_CHARS); ?></td></tr>
-            <tr><th>Current Status:</th><td><?php echo $object_status; ?></td></tr>
+            <tr><th>Current Status:</th><td><?php echo $object_status; ?> (<?php echo $object_response_time; ?>)</td></tr>
             <tr><th>Uptime:</th><td><?php echo $object_uptime; ?></td></tr>
           </tbody></table>
         </section>