summaryrefslogtreecommitdiffstats
path: root/system/libraries/Cache/drivers/Cache_memcached.php
blob: 16684fbb1e1a220fbf6e33c4aa4557f50ba56030 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2016, 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 - 2016, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 2.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * CodeIgniter Memcached Caching Class
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Core
 * @author		EllisLab Dev Team
 * @link
 */
class CI_Cache_memcached extends CI_Driver {

	/**
	 * Holds the memcached object
	 *
	 * @var object
	 */
	protected $_memcached;

	/**
	 * Memcached configuration
	 *
	 * @var array
	 */
	protected $_memcache_conf = array(
		'default' => array(
			'host'		=> '127.0.0.1',
			'port'		=> 11211,
			'weight'	=> 1
		)
	);

	// ------------------------------------------------------------------------

	/**
	 * Class constructor
	 *
	 * Setup Memcache(d)
	 *
	 * @return	void
	 */
	public function __construct()
	{
		// Try to load memcached server info from the config file.
		$CI =& get_instance();
		$defaults = $this->_memcache_conf['default'];

		if ($CI->config->load('memcached', TRUE, TRUE))
		{
			if (is_array($CI->config->config['memcached']))
			{
				$this->_memcache_conf = array();

				foreach ($CI->config->config['memcached'] as $name => $conf)
				{
					$this->_memcache_conf[$name] = $conf;
				}
			}
		}

		if (class_exists('Memcached', FALSE))
		{
			$this->_memcached = new Memcached();
		}
		elseif (class_exists('Memcache', FALSE))
		{
			$this->_memcached = new Memcache();
		}
		else
		{
			log_message('error', 'Cache: Failed to create Memcache(d) object; extension not loaded?');
		}

		foreach ($this->_memcache_conf as $cache_server)
		{
			isset($cache_server['hostname']) OR $cache_server['hostname'] = $defaults['host'];
			isset($cache_server['port']) OR $cache_server['port'] = $defaults['port'];
			isset($cache_server['weight']) OR $cache_server['weight'] = $defaults['weight'];

			if (get_class($this->_memcached) === 'Memcache')
			{
				// Third parameter is persistance and defaults to TRUE.
				$this->_memcached->addServer(
					$cache_server['hostname'],
					$cache_server['port'],
					TRUE,
					$cache_server['weight']
				);
			}
			else
			{
				$this->_memcached->addServer(
					$cache_server['hostname'],
					$cache_server['port'],
					$cache_server['weight']
				);
			}
		}
	}

	// ------------------------------------------------------------------------

	/**
	 * Fetch from cache
	 *
	 * @param	string	$id	Cache ID
	 * @return	mixed	Data on success, FALSE on failure
	 */
	public function get($id)
	{
		$data = $this->_memcached->get($id);

		return is_array($data) ? $data[0] : $data;
	}

	// ------------------------------------------------------------------------

	/**
	 * Save
	 *
	 * @param	string	$id	Cache ID
	 * @param	mixed	$data	Data being cached
	 * @param	int	$ttl	Time to live
	 * @param	bool	$raw	Whether to store the raw value
	 * @return	bool	TRUE on success, FALSE on failure
	 */
	public function save($id, $data, $ttl = 60, $raw = FALSE)
	{
		if ($raw !== TRUE)
		{
			$data = array($data, time(), $ttl);
		}

		if (get_class($this->_memcached) === 'Memcached')
		{
			return $this->_memcached->set($id, $data, $ttl);
		}
		elseif (get_class($this->_memcached) === 'Memcache')
		{
			return $this->_memcached->set($id, $data, 0, $ttl);
		}

		return FALSE;
	}

	// ------------------------------------------------------------------------

	/**
	 * Delete from Cache
	 *
	 * @param	mixed	$id	key to be deleted.
	 * @return	bool	true on success, false on failure
	 */
	public function delete($id)
	{
		return $this->_memcached->delete($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 $this->_memcached->increment($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 $this->_memcached->decrement($id, $offset);
	}

	// ------------------------------------------------------------------------

	/**
	 * Clean the Cache
	 *
	 * @return	bool	false on failure/true on success
	 */
	public function clean()
	{
		return $this->_memcached->flush();
	}

	// ------------------------------------------------------------------------

	/**
	 * Cache Info
	 *
	 * @return	mixed	array on success, false on failure
	 */
	public function cache_info()
	{
		return $this->_memcached->getStats();
	}

	// ------------------------------------------------------------------------

	/**
	 * Get Cache Metadata
	 *
	 * @param	mixed	$id	key to get cache metadata on
	 * @return	mixed	FALSE on failure, array on success.
	 */
	public function get_metadata($id)
	{
		$stored = $this->_memcached->get($id);

		if (count($stored) !== 3)
		{
			return FALSE;
		}

		list($data, $time, $ttl) = $stored;

		return array(
			'expire'	=> $time + $ttl,
			'mtime'		=> $time,
			'data'		=> $data
		);
	}

	// ------------------------------------------------------------------------

	/**
	 * Is supported
	 *
	 * Returns FALSE if memcached is not supported on the system.
	 * If it is, we setup the memcached object & return TRUE
	 *
	 * @return	bool
	 */
	public function is_supported()
	{
		return (extension_loaded('memcached') OR extension_loaded('memcache'));
	}
}