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<?php
/**
* Base class for memcached clients.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Cache
*/
/**
* Base class for memcached clients.
*
* @ingroup Cache
*/
class MemcachedBagOStuff extends BagOStuff {
protected $client;
/**
* Fill in the defaults for any parameters missing from $params, using the
* backwards-compatible global variables
*/
protected function applyDefaultParams( $params ) {
if ( !isset( $params['servers'] ) ) {
$params['servers'] = $GLOBALS['wgMemCachedServers'];
}
if ( !isset( $params['debug'] ) ) {
$params['debug'] = $GLOBALS['wgMemCachedDebug'];
}
if ( !isset( $params['persistent'] ) ) {
$params['persistent'] = $GLOBALS['wgMemCachedPersistent'];
}
if ( !isset( $params['compress_threshold'] ) ) {
$params['compress_threshold'] = 1500;
}
if ( !isset( $params['timeout'] ) ) {
$params['timeout'] = $GLOBALS['wgMemCachedTimeout'];
}
if ( !isset( $params['connect_timeout'] ) ) {
$params['connect_timeout'] = 0.5;
}
return $params;
}
/**
* @param $key string
* @return Mixed
*/
public function get( $key ) {
return $this->client->get( $this->encodeKey( $key ) );
}
/**
* @param $key string
* @param $value
* @param $exptime int
* @return bool
*/
public function set( $key, $value, $exptime = 0 ) {
return $this->client->set( $this->encodeKey( $key ), $value,
$this->fixExpiry( $exptime ) );
}
/**
* @param $key string
* @param $time int
* @return bool
*/
public function delete( $key, $time = 0 ) {
return $this->client->delete( $this->encodeKey( $key ), $time );
}
/**
* @param $key string
* @param $value int
* @param $exptime int (default 0)
* @return Mixed
*/
public function add( $key, $value, $exptime = 0 ) {
return $this->client->add( $this->encodeKey( $key ), $value,
$this->fixExpiry( $exptime ) );
}
/**
* @param $key string
* @param $value int
* @param $exptime
* @return Mixed
*/
public function replace( $key, $value, $exptime = 0 ) {
return $this->client->replace( $this->encodeKey( $key ), $value,
$this->fixExpiry( $exptime ) );
}
/**
* Get the underlying client object. This is provided for debugging
* purposes.
*/
public function getClient() {
return $this->client;
}
/**
* Encode a key for use on the wire inside the memcached protocol.
*
* We encode spaces and line breaks to avoid protocol errors. We encode
* the other control characters for compatibility with libmemcached
* verify_key. We leave other punctuation alone, to maximise backwards
* compatibility.
* @param $key string
* @return string
*/
public function encodeKey( $key ) {
return preg_replace_callback( '/[\x00-\x20\x25\x7f]+/',
array( $this, 'encodeKeyCallback' ), $key );
}
/**
* @param $m array
* @return string
*/
protected function encodeKeyCallback( $m ) {
return rawurlencode( $m[0] );
}
/**
* TTLs higher than 30 days will be detected as absolute TTLs
* (UNIX timestamps), and will result in the cache entry being
* discarded immediately because the expiry is in the past.
* Clamp expiries >30d at 30d, unless they're >=1e9 in which
* case they are likely to really be absolute (1e9 = 2011-09-09)
*/
function fixExpiry( $expiry ) {
if ( $expiry > 2592000 && $expiry < 1000000000 ) {
$expiry = 2592000;
}
return $expiry;
}
/**
* Decode a key encoded with encodeKey(). This is provided as a convenience
* function for debugging.
*
* @param $key string
*
* @return string
*/
public function decodeKey( $key ) {
return urldecode( $key );
}
/**
* Send a debug message to the log
*/
protected function debugLog( $text ) {
global $wgDebugLogGroups;
if( !isset( $wgDebugLogGroups['memcached'] ) ) {
# Prefix message since it will end up in main debug log file
$text = "memcached: $text";
}
if ( substr( $text, -1 ) !== "\n" ) {
$text .= "\n";
}
wfDebugLog( 'memcached', $text );
}
}
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