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
|
<?php
/*
* Project: MagpieRSS: a simple RSS integration tool
* File: rss_cache.inc, a simple, rolling(no GC), cache
* for RSS objects, keyed on URL.
* Author: Kellan Elliott-McCrea <kellan@protest.net>
* Version: 0.51
* License: GPL
*
* The lastest version of MagpieRSS can be obtained from:
* http://magpierss.sourceforge.net
*
* For questions, help, comments, discussion, etc., please join the
* Magpie mailing list:
* http://lists.sourceforge.net/lists/listinfo/magpierss-general
*
*/
class RSSCache {
var $BASE_CACHE = './cache'; // where the cache files are stored
var $MAX_AGE = 3600; // when are files stale, default one hour
var $ERROR = ""; // accumulate error messages
function RSSCache ($base='', $age='') {
if ( $base ) {
$this->BASE_CACHE = $base;
}
if ( $age ) {
$this->MAX_AGE = $age;
}
// attempt to make the cache directory
if ( ! file_exists( $this->BASE_CACHE ) ) {
$status = @mkdir( $this->BASE_CACHE, 0755 );
// if make failed
if ( ! $status ) {
$this->error(
"Cache couldn't make dir '" . $this->BASE_CACHE . "'."
);
}
}
}
/*=======================================================================*\
Function: set
Purpose: add an item to the cache, keyed on url
Input: url from wich the rss file was fetched
Output: true on sucess
\*=======================================================================*/
function set ($url, $rss) {
$this->ERROR = "";
$cache_file = $this->file_name( $url );
$fp = @fopen( $cache_file, 'w' );
if ( ! $fp ) {
$this->error(
"Cache unable to open file for writing: $cache_file"
);
return 0;
}
$data = $this->serialize( $rss );
fwrite( $fp, $data );
fclose( $fp );
return $cache_file;
}
/*=======================================================================*\
Function: get
Purpose: fetch an item from the cache
Input: url from wich the rss file was fetched
Output: cached object on HIT, false on MISS
\*=======================================================================*/
function get ($url) {
$this->ERROR = "";
$cache_file = $this->file_name( $url );
if ( ! file_exists( $cache_file ) ) {
$this->debug(
"Cache doesn't contain: $url (cache file: $cache_file)"
);
return 0;
}
$fp = @fopen($cache_file, 'r');
if ( ! $fp ) {
$this->error(
"Failed to open cache file for reading: $cache_file"
);
return 0;
}
if ($filesize = filesize($cache_file) ) {
$data = fread( $fp, filesize($cache_file) );
$rss = $this->unserialize( $data );
return $rss;
}
return 0;
}
/*=======================================================================*\
Function: check_cache
Purpose: check a url for membership in the cache
and whether the object is older then MAX_AGE (ie. STALE)
Input: url from wich the rss file was fetched
Output: cached object on HIT, false on MISS
\*=======================================================================*/
function check_cache ( $url ) {
$this->ERROR = "";
$filename = $this->file_name( $url );
if ( file_exists( $filename ) ) {
// find how long ago the file was added to the cache
// and whether that is longer then MAX_AGE
$mtime = filemtime( $filename );
$age = time() - $mtime;
if ( $this->MAX_AGE > $age ) {
// object exists and is current
return 'HIT';
}
else {
// object exists but is old
return 'STALE';
}
}
else {
// object does not exist
return 'MISS';
}
}
function cache_age( $cache_key ) {
$filename = $this->file_name( $url );
if ( file_exists( $filename ) ) {
$mtime = filemtime( $filename );
$age = time() - $mtime;
return $age;
}
else {
return -1;
}
}
/*=======================================================================*\
Function: serialize
\*=======================================================================*/
function serialize ( $rss ) {
return serialize( $rss );
}
/*=======================================================================*\
Function: unserialize
\*=======================================================================*/
function unserialize ( $data ) {
return unserialize( $data );
}
/*=======================================================================*\
Function: file_name
Purpose: map url to location in cache
Input: url from wich the rss file was fetched
Output: a file name
\*=======================================================================*/
function file_name ($url) {
$filename = md5( $url );
return join( DIRECTORY_SEPARATOR, array( $this->BASE_CACHE, $filename ) );
}
/*=======================================================================*\
Function: error
Purpose: register error
\*=======================================================================*/
function error ($errormsg, $lvl=E_USER_WARNING) {
// append PHP's error message if track_errors enabled
if ( isset($php_errormsg) ) {
$errormsg .= " ($php_errormsg)";
}
$this->ERROR = $errormsg;
if ( MAGPIE_DEBUG ) {
trigger_error( $errormsg, $lvl);
}
else {
error_log( $errormsg, 0);
}
}
function debug ($debugmsg, $lvl=E_USER_NOTICE) {
if ( MAGPIE_DEBUG ) {
$this->error("MagpieRSS [debug] $debugmsg", $lvl);
}
}
}
?>
|
