Memcached 2 Redis wrapper

memcached2redis.php

<?
/*
=========================
Memcached 2 Redis wrapper
=========================

Version 1.0.1, CopyLeft 2011.AUG.11



This piece of software is sponsored by Redis4You:
	http://redis4you.com/

This class utilize phpredis extension:
	https://github.com/nicolasff/phpredis

This class is distributed under GNU General Public License
	http://www.gnu.org/copyleft/gpl.html

If you wish commercial licence or support, please contact us at:
	hostmaster@e-nick.org



=====================================================
The class have some limitations. Please see the list.
=====================================================

Lame Implemented in non atomic way:

	prepend

Not implemented:

	addByKey
	appendByKey
	casByKey
	deleteByKey
	getByKey
	getDelayedByKey
	getMultiByKey
	prependByKey
	replaceByKey
	setByKey
	setMultiByKey

	cas

	getServerByKey
	getServerList

	getDelayed
	fetch
	fetchAll




	getResultCode
	getResultMessage

Implemented in different way:

	addServer
	addServers

	no CAS float for get and set

Implemented Empty/Fake functions

	getStats

	getVersion

	getOption
	setOption

=====================================================
*/

class Memcached{
	var $r;

	var $version;

	function __construct($persistent=0){
		// Fake memcached verion string...
		$this->version = "1.2.6";

		$this->r = new Redis();
	}

	function add($key, $value, $expiration=0){
		$ret = $this->r->set($key, $value);

		if (! $ret)
			return false;

		if ($expiration)
			$this->r->expire($key, $expiration);

		return true;
	}

	function addServer($host, $port, $weight = 0){
		try{
			$this->r->connect($host, $port);
		}catch(Exception $e){
			return false;
		}

		return true;
	}

	// Add just first server...
	function addServers($servers){
		return $this->addServer($servers[0][0], $servers[0][1], $servers[0][2]);
	}

	function append($key, $value){
		$expiration = $this->r->ttl($key);

		$ret = $this->r->append($key, $value);

		if (! $ret)
			return false;

		if ($expiration > 0)
			$this->r->expire($key, $expiration);

		return true;
	}

	function decrement($key, $offset = 1){
		$expiration = $this->r->ttl($key);

		$ret = false;

		// For performance reasons:
		if ($offset == 1)
			$ret = $this->r->decr($key);
		else
			$ret = $this->r->decrby($key, $offset);

		if ($expiration > 0)
			$this->r->expire($key, $expiration);

		return $ret;
	}

	function delete($key, $time = 0){
		return $this->r->del($key);
	}

	function flush($delay = 0){
		return $this->r->flushdb();
	}

	function get($key){
		return $this->r->get($key);
	}

	function getMulti($keys){
		/*
		$okeys = array();

		foreach($keys as $key){
			$okeys[$key] = $this->get($key);
		}

		return $okeys;
		*/

		return $this->r->mget($keys);
	}

	function getOption($option){
		return true;
	}

	function getStats(){
		return $this->r->info();
	}

	function getVersion(){
		return $this->version;
	}

	function increment($key, $offset = 1){
		$expiration = $this->r->ttl($key);

		$ret = false;

		// For performance reasons:
		if ($offset == 1)
			$ret = $this->r->incr($key);
		else
			$ret = $this->r->incrby($key, $offset);

		if ($expiration > 0)
			$this->r->expire($key, $expiration);

		return $ret;
	}

	function prepend($key, $value){
		$expiration = $this->r->ttl($key);

		// I know this sucks...

		$val = $this->r->get($key);

		if ($val === false)
			return false;

		$ret = $this->r->set($key, $value . $val);

		if ($expiration > 0)
			$this->r->expire($key, $expiration);

		return $ret;
	}

	function replace($key, $value, $expiration){
		$ret = $this->r->setnx($key, $value);

		if (! $ret)
			return false;

		if ($expiration > 0)
			$this->r->expire($key, $expiration);

		return true;
	}

	function set($key, $value, $expiration){
		$ret = $this->r->set($key, $value);

		if (! $ret)
			return false;

		if ($expiration > 0)
			$this->r->expire($key, $expiration);

		return true;
	}

	function setMulti($keys, $expiration){
		$ret = $this->r->mset($keys);

		if (! $ret)
			return false;

		if ($expiration > 0){
			foreach($keys as $key){
				$this->r->expire(key, $expiration);
			}
		}

		return true;
	}

	function setOption($option, $value){
		return true;
	}
};