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wp-content/plugins/shortpixel-image-optimiser/class/Model/CacheModel.php

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+<?php
+namespace ShortPixel\Model;
+
+if ( ! defined( 'ABSPATH' ) ) {
+ exit; // Exit if accessed directly.
+}
+
+use ShortPixel\ShortPixelLogger\ShortPixelLogger as Log;
+
+
+/* Model for storing cached data
+*
+* Use this in conjunction with cache controller, don't call it stand-alone.
+*/
+class CacheModel
+{
+
+  protected $name;
+  protected $value;
+  protected $expires = HOUR_IN_SECONDS;  // This is the expires, when saved without SetExpires! This value is not a representation of any expire time when loading something cache!
+  protected $exists = false;
+
+
+  public function __construct($name)
+  {
+     $this->name = $name;
+     $this->load();
+  }
+
+  /** Set the expiration of this item. In seconds
+  * @param $time Expiration in Seconds
+  */
+  public function setExpires($time)
+  {
+    $this->expires = $time;
+  }
+
+  public function setValue($value)
+  {
+    $this->value = $value;
+  }
+
+  public function exists()
+  {
+    return $this->exists;
+  }
+
+  public function getValue()
+  {
+      return $this->value;
+  }
+
+  public function getName()
+  {
+      return $this->name;
+  }
+
+  public function save()
+  {
+		 if ($this->expires <= 0)
+		 {
+			 	return; // don't save transients without expiration
+		 }
+     $this->exists = set_transient($this->name, $this->value, $this->expires);
+
+  }
+
+  public function delete()
+  {
+     delete_transient($this->name);
+     $this->exists = false;
+  }
+
+  protected function load()
+  {
+    $item = get_transient($this->name);
+    if ($item !== false)
+    {
+      $this->value = $item;
+      $this->exists = true;
+			$this->checkExpiration($this->name);
+    }
+  }
+
+	/** It has been shown that sometimes the expire of the transient is lost, creating a persistent transient.  This can be harmful, especially in the case of bulk-secret which can create a situation were no client will optimize due to the hanging transient. */
+	private function checkExpiration($name)
+	{
+			$option = get_option('_transient_timeout_' . $name);
+
+			if (false !== $option && is_numeric($option))
+			{
+				 return true; // ok
+			}
+			else {
+
+        // Via object cache the expire info can't be retrieved. Customer is on it's own with this.
+         if (wp_using_ext_object_cache())
+         {
+            return true;
+         }
+
+				 $this->value = '';
+				 $this->delete();
+				 Log::addError('Found hanging transient with no expiration! ' . $name, $option);
+			}
+	}
+
+}