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-rw-r--r--system/libraries/Cache/drivers/Cache_apcu.php219
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diff --git a/system/libraries/Cache/drivers/Cache_apcu.php b/system/libraries/Cache/drivers/Cache_apcu.php
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+<?php
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP
+ *
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2018, British Columbia Institute of Technology
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @package CodeIgniter
+ * @author EllisLab Dev Team
+ * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
+ * @copyright Copyright (c) 2014 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
+ * @license http://opensource.org/licenses/MIT MIT License
+ * @link https://codeigniter.com
+ * @since Version 3.2.0
+ * @filesource
+ */
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+/**
+ * CodeIgniter APCu Caching Class
+ *
+ * @package CodeIgniter
+ * @subpackage Libraries
+ * @category Core
+ * @author CodeIgniter Dev team
+ */
+class CI_Cache_apcu extends CI_Driver {
+
+ /**
+ * Class constructor
+ *
+ * Only present so that an error message is logged
+ * if APCu is not available.
+ *
+ * @return void
+ */
+ public function __construct()
+ {
+ if ( ! $this->is_supported())
+ {
+ log_message('error', 'Cache: Failed to initialize APCu; extension not loaded/enabled?');
+ }
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Get
+ *
+ * Look for a value in the cache. If it exists, return the data
+ * if not, return FALSE
+ *
+ * @param string
+ * @return mixed value that is stored/FALSE on failure
+ */
+ public function get($id)
+ {
+ $success = FALSE;
+ $data = apcu_fetch($id, $success);
+
+ if ($success === TRUE)
+ {
+ return is_array($data)
+ ? $data[0]
+ : $data;
+ }
+
+ return FALSE;
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Cache Save
+ *
+ * @param string $id Cache ID
+ * @param mixed $data Data to store
+ * @param int $ttl Length of time (in seconds) to cache the data
+ * @param bool $raw Whether to store the raw value
+ * @return bool TRUE on success, FALSE on failure
+ */
+ public function save($id, $data, $ttl = 60, $raw = FALSE)
+ {
+ $ttl = (int) $ttl;
+
+ return apcu_store(
+ $id,
+ ($raw === TRUE ? $data : array($data, time(), $ttl)),
+ $ttl
+ );
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Delete from Cache
+ *
+ * @param mixed unique identifier of the item in the cache
+ * @return bool true on success/false on failure
+ */
+ public function delete($id)
+ {
+ return apcu_delete($id);
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Increment a raw value
+ *
+ * @param string $id Cache ID
+ * @param int $offset Step/value to add
+ * @return mixed New value on success or FALSE on failure
+ */
+ public function increment($id, $offset = 1)
+ {
+ return apcu_inc($id, $offset);
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Decrement a raw value
+ *
+ * @param string $id Cache ID
+ * @param int $offset Step/value to reduce by
+ * @return mixed New value on success or FALSE on failure
+ */
+ public function decrement($id, $offset = 1)
+ {
+ return apcu_dec($id, $offset);
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Clean the cache
+ *
+ * @return bool false on failure/true on success
+ */
+ public function clean()
+ {
+ return apcu_clear_cache();
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Cache Info
+ *
+ * @return mixed array on success, false on failure
+ */
+ public function cache_info()
+ {
+ return apcu_cache_info();
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Get Cache Metadata
+ *
+ * @param mixed key to get cache metadata on
+ * @return mixed array on success/false on failure
+ */
+ public function get_metadata($id)
+ {
+ $success = FALSE;
+ $stored = apcu_fetch($id, $success);
+
+ if ($success === FALSE OR count($stored) !== 3)
+ {
+ return FALSE;
+ }
+
+ list($data, $time, $ttl) = $stored;
+
+ return array(
+ 'expire' => $time + $ttl,
+ 'mtime' => $time,
+ 'data' => $data
+ );
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * is_supported()
+ *
+ * Check to see if APCu is available on this system, bail if it isn't.
+ *
+ * @return bool
+ */
+ public function is_supported()
+ {
+ return (extension_loaded('apcu') && ini_get('apc.enabled'));
+ }
+} \ No newline at end of file