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<?php
/**
* Object caching using memcached.
*
* 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
*/
/**
* A wrapper class for the PECL memcached client
*
* @ingroup Cache
*/
class MemcachedPeclBagOStuff extends MemcachedBagOStuff {
/**
* Constructor
*
* Available parameters are:
* - servers: The list of IP:port combinations holding the memcached servers.
* - persistent: Whether to use a persistent connection
* - compress_threshold: The minimum size an object must be before it is compressed
* - timeout: The read timeout in microseconds
* - connect_timeout: The connect timeout in seconds
* - serializer: May be either "php" or "igbinary". Igbinary produces more compact
* values, but serialization is much slower unless the php.ini option
* igbinary.compact_strings is off.
*/
function __construct( $params ) {
$params = $this->applyDefaultParams( $params );
if ( $params['persistent'] ) {
// The pool ID must be unique to the server/option combination.
// The Memcached object is essentially shared for each pool ID.
// We can only resuse a pool ID if we keep the config consistent.
$this->client = new Memcached( md5( serialize( $params ) ) );
if ( count( $this->client->getServerList() ) ) {
wfDebug( __METHOD__ . ": persistent Memcached object already loaded.\n" );
return; // already initialized; don't add duplicate servers
}
} else {
$this->client = new Memcached;
}
if ( !isset( $params['serializer'] ) ) {
$params['serializer'] = 'php';
}
// The compression threshold is an undocumented php.ini option for some
// reason. There's probably not much harm in setting it globally, for
// compatibility with the settings for the PHP client.
ini_set( 'memcached.compression_threshold', $params['compress_threshold'] );
// Set timeouts
$this->client->setOption( Memcached::OPT_CONNECT_TIMEOUT, $params['connect_timeout'] * 1000 );
$this->client->setOption( Memcached::OPT_SEND_TIMEOUT, $params['timeout'] );
$this->client->setOption( Memcached::OPT_RECV_TIMEOUT, $params['timeout'] );
$this->client->setOption( Memcached::OPT_POLL_TIMEOUT, $params['timeout'] / 1000 );
// Set libketama mode since it's recommended by the documentation and
// is as good as any. There's no way to configure libmemcached to use
// hashes identical to the ones currently in use by the PHP client, and
// even implementing one of the libmemcached hashes in pure PHP for
// forwards compatibility would require MWMemcached::get_sock() to be
// rewritten.
$this->client->setOption( Memcached::OPT_LIBKETAMA_COMPATIBLE, true );
// Set the serializer
switch ( $params['serializer'] ) {
case 'php':
$this->client->setOption( Memcached::OPT_SERIALIZER, Memcached::SERIALIZER_PHP );
break;
case 'igbinary':
if ( !Memcached::HAVE_IGBINARY ) {
throw new MWException( __CLASS__.': the igbinary extension is not available ' .
'but igbinary serialization was requested.' );
}
$this->client->setOption( Memcached::OPT_SERIALIZER, Memcached::SERIALIZER_IGBINARY );
break;
default:
throw new MWException( __CLASS__.': invalid value for serializer parameter' );
}
$servers = array();
foreach ( $params['servers'] as $host ) {
$servers[] = IP::splitHostAndPort( $host ); // (ip, port)
}
$this->client->addServers( $servers );
}
/**
* @param $key string
* @return Mixed
*/
public function get( $key ) {
$this->debugLog( "get($key)" );
return $this->checkResult( $key, parent::get( $key ) );
}
/**
* @param $key string
* @param $value
* @param $exptime int
* @return bool
*/
public function set( $key, $value, $exptime = 0 ) {
$this->debugLog( "set($key)" );
return $this->checkResult( $key, parent::set( $key, $value, $exptime ) );
}
/**
* @param $key string
* @param $time int
* @return bool
*/
public function delete( $key, $time = 0 ) {
$this->debugLog( "delete($key)" );
$result = parent::delete( $key, $time );
if ( $result === false && $this->client->getResultCode() === Memcached::RES_NOTFOUND ) {
// "Not found" is counted as success in our interface
return true;
} else {
return $this->checkResult( $key, $result );
}
}
/**
* @param $key string
* @param $value int
* @param $exptime int
* @return Mixed
*/
public function add( $key, $value, $exptime = 0 ) {
$this->debugLog( "add($key)" );
return $this->checkResult( $key, parent::add( $key, $value, $exptime ) );
}
/**
* @param $key string
* @param $value int
* @param $exptime
* @return Mixed
*/
public function replace( $key, $value, $exptime = 0 ) {
$this->debugLog( "replace($key)" );
return $this->checkResult( $key, parent::replace( $key, $value, $exptime ) );
}
/**
* @param $key string
* @param $value int
* @return Mixed
*/
public function incr( $key, $value = 1 ) {
$this->debugLog( "incr($key)" );
$result = $this->client->increment( $key, $value );
return $this->checkResult( $key, $result );
}
/**
* @param $key string
* @param $value int
* @return Mixed
*/
public function decr( $key, $value = 1 ) {
$this->debugLog( "decr($key)" );
$result = $this->client->decrement( $key, $value );
return $this->checkResult( $key, $result );
}
/**
* Check the return value from a client method call and take any necessary
* action. Returns the value that the wrapper function should return. At
* present, the return value is always the same as the return value from
* the client, but some day we might find a case where it should be
* different.
*
* @param $key string The key used by the caller, or false if there wasn't one.
* @param $result Mixed The return value
* @return Mixed
*/
protected function checkResult( $key, $result ) {
if ( $result !== false ) {
return $result;
}
switch ( $this->client->getResultCode() ) {
case Memcached::RES_SUCCESS:
break;
case Memcached::RES_DATA_EXISTS:
case Memcached::RES_NOTSTORED:
case Memcached::RES_NOTFOUND:
$this->debugLog( "result: " . $this->client->getResultMessage() );
break;
default:
$msg = $this->client->getResultMessage();
if ( $key !== false ) {
$server = $this->client->getServerByKey( $key );
$serverName = "{$server['host']}:{$server['port']}";
$msg = "Memcached error for key \"$key\" on server \"$serverName\": $msg";
} else {
$msg = "Memcached error: $msg";
}
wfDebugLog( 'memcached-serious', $msg );
}
return $result;
}
/**
* @param $keys Array
* @return Array
*/
public function getMulti( array $keys ) {
$this->debugLog( 'getMulti(' . implode( ', ', $keys ) . ')' );
$callback = array( $this, 'encodeKey' );
$result = $this->client->getMulti( array_map( $callback, $keys ) );
return $this->checkResult( false, $result );
}
/* NOTE: there is no cas() method here because it is currently not supported
* by the BagOStuff interface and other BagOStuff subclasses, such as
* SqlBagOStuff.
*/
}
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