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
|
<?php
/**
* Elgg cache
* Cache file interface for caching data.
*
* @package Elgg
* @subpackage API
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Curverider Ltd <info@elgg.com>
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* ElggCache The elgg cache superclass.
* This defines the interface for a cache (wherever that cache is stored).
*
* @author Curverider Ltd <info@elgg.com>
* @package Elgg
* @subpackage API
*/
abstract class ElggCache
{
/**
* Variables for the cache object.
*
* @var array
*/
private $variables;
/**
* Set the constructor.
*/
function __construct() { $this->variables = array(); }
/**
* Set a cache variable.
*
* @param string $variable
* @param string $value
*/
public function set_variable($variable, $value)
{
if (!isarray($this->variables))
$this->variables = array();
$this->variables[$variable] = $value;
}
/**
* Get variables for this cache.
*
* @param string $variable
* @return mixed The variable or null;
*/
public function get_variable($variable)
{
if (isset($this->variables[$variable]))
return $this->variables[$variable];
return null;
}
/**
* Save data in a cache.
*
* @param string $key
* @param string $data
* @return bool
*/
abstract public function save($key, $data);
/**
* Load data from the cache using a given key.
*
* @param string $key
* @param int $offset
* @param int $limit
* @return mixed The stored data or false.
*/
abstract public function load($key, $offset = 0, $limit = null);
}
/**
* ElggFileCache
* Store cached data in a file store.
*
* @author Curverider Ltd <info@elgg.com>
* @package Elgg
* @subpackage API
*/
class ElggFileCache extends ElggCache
{
/**
* Set the Elgg cache.
*
* @param string $cache_path The cache path.
* @param int $max_age Maximum age in seconds, 0 if no limit.
* @param int $max_size Maximum size of cache in seconds, 0 if no limit.
*/
function __construct($cache_path, $max_age = 0, $max_size = 0)
{
$this->set_variable("cache_path", $cache_path);
$this->set_variable("max_age", $max_age);
$this->set_variable("max_size", $max_size);
if ($cache_path=="") throw new ConfigurationException(elgg_echo('ConfigurationException:NoCachePath'));
}
/**
* Create and return a handle to a file.
*
* @param string $filename
* @param string $rw
*/
protected function create_file($filename, $rw = "rb")
{
// Create a filename matrix
$matrix = "";
$depth = strlen($filename);
if ($depth > 5) $depth = 5;
// for ($n = 0; $n < $depth; $n++)
// $matrix .= $filename[$n] . "/";
// Create full path
$path = $this->get_variable("cache_path") . $matrix;
// if (!mkdir($path, 0700, true)) throw new IOException("Could not make $path");
// Open the file
if ((!file_exists($path . $filename)) && ($rw=="rb")) return false;
return fopen($path . $filename, $rw);
}
/**
* Create a sanitised filename for the file.
*
* @param string $filename
*/
protected function sanitise_filename($filename)
{
// TODO : Writeme
return $filename;
}
/**
* Save a key
*
* @param string $key
* @param string $data
* @return boolean
*/
public function save($key, $data)
{
$f = $this->create_file($this->sanitise_filename($key), "wb");
if ($f)
{
$result = fwrite($f, $data);
fclose($f);
return $result;
}
return false;
}
/**
* Load a key
*
* @param string $key
* @param int $offset
* @param int $limit
* @return string
*/
public function load($key, $offset = 0, $limit = null)
{
$f = $this->create_file($this->sanitise_filename($key));
if ($f)
{
fseek($f, $offset);
$data = stream_get_contents($f, $limit, $offset);
fclose($f);
return $data;
}
return false;
}
public function __destruct()
{
// TODO: Check size and age, clean up accordingly
$size = 0;
$dir = $this->get_variable("cache_path");
// Short circuit if both size and age are unlimited
if (($this->get_variable("max_age")==0) && ($this->get_variable("max_size")==0))
return;
$exclude = array(".","..");
$files = scandir($dir);
if (!$files) throw new IOException(sprintf(elgg_echo('IOException:NotDirectory'), $dir));
// Perform cleanup
foreach ($files as $f)
{
if (!in_array($f, $exclude))
{
$stat = stat($dir.$f);
// Add size
$size .= $stat['size'];
// Is this older than my maximum date?
if (($this->get_variable("max_age")>0) && (time() - $stat['mtime'] > $this->get_variable("max_age")))
unlink($dir.$f);
// TODO: Size
}
}
}
}
?>
|
