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59c06b17 CS |
1 | <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); |
2 | /** | |
3 | * CodeIgniter | |
4 | * | |
5 | * An open source application development framework for PHP 4.3.2 or newer | |
6 | * | |
7 | * @package CodeIgniter | |
8 | * @author ExpressionEngine Dev Team | |
9 | * @copyright Copyright (c) 2006 - 2012 EllisLab, Inc. | |
10 | * @license http://codeigniter.com/user_guide/license.html | |
11 | * @link http://codeigniter.com | |
12 | * @since Version 2.0 | |
13 | * @filesource | |
14 | */ | |
15 | ||
16 | // ------------------------------------------------------------------------ | |
17 | ||
18 | /** | |
19 | * CodeIgniter Memcached Caching Class | |
20 | * | |
21 | * @package CodeIgniter | |
22 | * @subpackage Libraries | |
23 | * @category Core | |
24 | * @author ExpressionEngine Dev Team | |
25 | * @link | |
26 | */ | |
27 | ||
28 | class CI_Cache_file extends CI_Driver { | |
29 | ||
30 | protected $_cache_path; | |
31 | ||
32 | /** | |
33 | * Constructor | |
34 | */ | |
35 | public function __construct() | |
36 | { | |
37 | $CI =& get_instance(); | |
38 | $CI->load->helper('file'); | |
39 | ||
40 | $path = $CI->config->item('cache_path'); | |
41 | ||
42 | $this->_cache_path = ($path == '') ? APPPATH.'cache/' : $path; | |
43 | } | |
44 | ||
45 | // ------------------------------------------------------------------------ | |
46 | ||
47 | /** | |
48 | * Fetch from cache | |
49 | * | |
50 | * @param mixed unique key id | |
51 | * @return mixed data on success/false on failure | |
52 | */ | |
53 | public function get($id) | |
54 | { | |
55 | if ( ! file_exists($this->_cache_path.$id)) | |
56 | { | |
57 | return FALSE; | |
58 | } | |
59 | ||
60 | $data = read_file($this->_cache_path.$id); | |
61 | $data = unserialize($data); | |
62 | ||
63 | if (time() > $data['time'] + $data['ttl']) | |
64 | { | |
65 | unlink($this->_cache_path.$id); | |
66 | return FALSE; | |
67 | } | |
68 | ||
69 | return $data['data']; | |
70 | } | |
71 | ||
72 | // ------------------------------------------------------------------------ | |
73 | ||
74 | /** | |
75 | * Save into cache | |
76 | * | |
77 | * @param string unique key | |
78 | * @param mixed data to store | |
79 | * @param int length of time (in seconds) the cache is valid | |
80 | * - Default is 60 seconds | |
81 | * @return boolean true on success/false on failure | |
82 | */ | |
83 | public function save($id, $data, $ttl = 60) | |
84 | { | |
85 | $contents = array( | |
86 | 'time' => time(), | |
87 | 'ttl' => $ttl, | |
88 | 'data' => $data | |
89 | ); | |
90 | ||
91 | if (write_file($this->_cache_path.$id, serialize($contents))) | |
92 | { | |
93 | @chmod($this->_cache_path.$id, 0777); | |
94 | return TRUE; | |
95 | } | |
96 | ||
97 | return FALSE; | |
98 | } | |
99 | ||
100 | // ------------------------------------------------------------------------ | |
101 | ||
102 | /** | |
103 | * Delete from Cache | |
104 | * | |
105 | * @param mixed unique identifier of item in cache | |
106 | * @return boolean true on success/false on failure | |
107 | */ | |
108 | public function delete($id) | |
109 | { | |
110 | return unlink($this->_cache_path.$id); | |
111 | } | |
112 | ||
113 | // ------------------------------------------------------------------------ | |
114 | ||
115 | /** | |
116 | * Clean the Cache | |
117 | * | |
118 | * @return boolean false on failure/true on success | |
119 | */ | |
120 | public function clean() | |
121 | { | |
122 | return delete_files($this->_cache_path); | |
123 | } | |
124 | ||
125 | // ------------------------------------------------------------------------ | |
126 | ||
127 | /** | |
128 | * Cache Info | |
129 | * | |
130 | * Not supported by file-based caching | |
131 | * | |
132 | * @param string user/filehits | |
133 | * @return mixed FALSE | |
134 | */ | |
135 | public function cache_info($type = NULL) | |
136 | { | |
137 | return get_dir_file_info($this->_cache_path); | |
138 | } | |
139 | ||
140 | // ------------------------------------------------------------------------ | |
141 | ||
142 | /** | |
143 | * Get Cache Metadata | |
144 | * | |
145 | * @param mixed key to get cache metadata on | |
146 | * @return mixed FALSE on failure, array on success. | |
147 | */ | |
148 | public function get_metadata($id) | |
149 | { | |
150 | if ( ! file_exists($this->_cache_path.$id)) | |
151 | { | |
152 | return FALSE; | |
153 | } | |
154 | ||
155 | $data = read_file($this->_cache_path.$id); | |
156 | $data = unserialize($data); | |
157 | ||
158 | if (is_array($data)) | |
159 | { | |
160 | $mtime = filemtime($this->_cache_path.$id); | |
161 | ||
162 | if ( ! isset($data['ttl'])) | |
163 | { | |
164 | return FALSE; | |
165 | } | |
166 | ||
167 | return array( | |
168 | 'expire' => $mtime + $data['ttl'], | |
169 | 'mtime' => $mtime | |
170 | ); | |
171 | } | |
172 | ||
173 | return FALSE; | |
174 | } | |
175 | ||
176 | // ------------------------------------------------------------------------ | |
177 | ||
178 | /** | |
179 | * Is supported | |
180 | * | |
181 | * In the file driver, check to see that the cache directory is indeed writable | |
182 | * | |
183 | * @return boolean | |
184 | */ | |
185 | public function is_supported() | |
186 | { | |
187 | return is_really_writable($this->_cache_path); | |
188 | } | |
189 | ||
190 | // ------------------------------------------------------------------------ | |
191 | } | |
192 | // End Class | |
193 | ||
194 | /* End of file Cache_file.php */ | |
195 | /* Location: ./system/libraries/Cache/drivers/Cache_file.php */ |