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
|
<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2009, StatusNet, Inc.
*
* Plugin to implement cache interface for memcache
*
* PHP version 5
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Cache
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2009 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
if (!defined('STATUSNET')) {
// This check helps protect against security problems;
// your code file can't be executed directly from the web.
exit(1);
}
/**
* A plugin to use memcache for the cache interface
*
* This used to be encoded as config-variable options in the core code;
* it's now broken out to a separate plugin. The same interface can be
* implemented by other plugins.
*
* @category Cache
* @package StatusNet
* @author Evan Prodromou <evan@status.net>
* @copyright 2009 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://status.net/
*/
class MemcachePlugin extends Plugin
{
private $_conn = null;
public $servers = array('127.0.0.1;11211');
public $compressThreshold = 20480;
public $compressMinSaving = 0.2;
public $persistent = null;
/**
* Initialize the plugin
*
* Note that onStartCacheGet() may have been called before this!
*
* @return boolean flag value
*/
function onInitializePlugin()
{
if (is_null($this->persistent)) {
$this->persistent = (php_sapi_name() == 'cli') ? false : true;
}
$this->_ensureConn();
return true;
}
/**
* Get a value associated with a key
*
* The value should have been set previously.
*
* @param string &$key in; Lookup key
* @param mixed &$value out; value associated with key
*
* @return boolean hook success
*/
function onStartCacheGet(&$key, &$value)
{
$this->_ensureConn();
$value = $this->_conn->get($key);
Event::handle('EndCacheGet', array($key, &$value));
return false;
}
/**
* Associate a value with a key
*
* @param string &$key in; Key to use for lookups
* @param mixed &$value in; Value to associate
* @param integer &$flag in; Flag (passed through to Memcache)
* @param integer &$expiry in; Expiry (passed through to Memcache)
* @param boolean &$success out; Whether the set was successful
*
* @return boolean hook success
*/
function onStartCacheSet(&$key, &$value, &$flag, &$expiry, &$success)
{
$this->_ensureConn();
$success = $this->_conn->set($key, $value, $flag, $expiry);
Event::handle('EndCacheSet', array($key, $value, $flag,
$expiry));
return false;
}
/**
* Delete a value associated with a key
*
* @param string &$key in; Key to lookup
* @param boolean &$success out; whether it worked
*
* @return boolean hook success
*/
function onStartCacheDelete(&$key, &$success)
{
$this->_ensureConn();
$success = $this->_conn->delete($key);
Event::handle('EndCacheDelete', array($key));
return false;
}
function onStartCacheReconnect(&$success)
{
if (empty($this->_conn)) {
// nothing to do
return true;
}
if ($this->persistent) {
common_log(LOG_ERR, "Cannot close persistent memcached connection");
$success = false;
} else {
common_log(LOG_INFO, "Closing memcached connection");
$success = $this->_conn->close();
$this->_conn = null;
}
return false;
}
/**
* Ensure that a connection exists
*
* Checks the instance $_conn variable and connects
* if it is empty.
*
* @return void
*/
private function _ensureConn()
{
if (empty($this->_conn)) {
$this->_conn = new Memcache();
if (is_array($this->servers)) {
$servers = $this->servers;
} else {
$servers = array($this->servers);
}
foreach ($servers as $server) {
if (strpos($server, ';') !== false) {
list($host, $port) = explode(';', $server);
} else {
$host = $server;
$port = 11211;
}
$this->_conn->addServer($host, $port, $this->persistent);
}
// Compress items stored in the cache if they're over threshold in size
// (default 2KiB) and the compression would save more than min savings
// ratio (default 0.2).
// Allows the cache to store objects larger than 1MB (if they
// compress to less than 1MB), and improves cache memory efficiency.
$this->_conn->setCompressThreshold($this->compressThreshold,
$this->compressMinSaving);
}
}
function onPluginVersion(&$versions)
{
$versions[] = array('name' => 'Memcache',
'version' => STATUSNET_VERSION,
'author' => 'Evan Prodromou, Craig Andrews',
'homepage' => 'http://status.net/wiki/Plugin:Memcache',
'rawdescription' =>
_m('Use <a href="http://memcached.org/">Memcached</a> to cache query results.'));
return true;
}
}
|
