<?php
/* Copyright (C) 2009-2010 Laurent Destailleur  <eldy@users.sourceforge.net>
 *
 * 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 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * or see http://www.gnu.org/
 */

/**
 *  \file		htdocs/core/lib/memory.lib.php
 *  \brief		Set of function for memory/cache management
 */

global $shmkeys,$shmoffset;

$shmkeys=array('main'=>1,'admin'=>2,'dict'=>3,'companies'=>4,'suppliers'=>5,'products'=>6,
				'commercial'=>7,'compta'=>8,'projects'=>9,'cashdesk'=>10,'agenda'=>11,'bills'=>12,
				'propal'=>13,'boxes'=>14,'banks'=>15,'other'=>16,'errors'=>17,'members'=>18,'ecm'=>19,
				'orders'=>20,'users'=>21,'help'=>22,'stocks'=>23,'interventions'=>24,
				'donations'=>25,'contracts'=>26);
$shmoffset=1000;	// Max number of entries found into a language file. If too low, some entries will be overwritten.


/**
 * 	Save data into a memory area shared by all users, all sessions on server
 *
 *  @param	string      $memoryid		Memory id of shared area
 * 	@param	string		$data			Data to save
 * 	@return	int							<0 if KO, Nb of bytes written if OK
 */
function dol_setcache($memoryid,$data)
{
	global $conf;
	$result=0;

	// Using a memcached server
	if (! empty($conf->memcached->enabled) && class_exists('Memcached'))
	{
	    global $dolmemcache;
		if (empty($dolmemcache) || ! is_object($dolmemcache))
    	{
       	    $dolmemcache=new Memcached();
       		$tmparray=explode(':',$conf->global->MEMCACHED_SERVER);
       		$result=$dolmemcache->addServer($tmparray[0], $tmparray[1]?$tmparray[1]:11211);
       		if (! $result) return -1;
       	}
       	
	    $memoryid=session_name().'_'.$memoryid;
		//$dolmemcache->setOption(Memcached::OPT_COMPRESSION, false);
		$dolmemcache->add($memoryid,$data);    // This fails if key already exists
		$rescode=$dolmemcache->getResultCode();
		if ($rescode == 0)
		{
			return count($data);
		}
		else
		{
			return -$rescode;
		}
	}
	else if (! empty($conf->memcached->enabled) && class_exists('Memcache'))
	{
		global $dolmemcache;
		if (empty($dolmemcache) || ! is_object($dolmemcache))
    	{
       	    $dolmemcache=new Memcache();
       		$tmparray=explode(':',$conf->global->MEMCACHED_SERVER);
       		$result=$dolmemcache->addServer($tmparray[0], $tmparray[1]?$tmparray[1]:11211);
       		if (! $result) return -1;
       	}
	    
       	$memoryid=session_name().'_'.$memoryid;
		//$dolmemcache->setOption(Memcached::OPT_COMPRESSION, false);
		$result=$dolmemcache->add($memoryid,$data);    // This fails if key already exists
		if ($result)
		{
			return count($data);
		}
		else
		{
			return -1;
		}
	}
	// Using shmop
	else if (isset($conf->global->MAIN_OPTIMIZE_SPEED) && ($conf->global->MAIN_OPTIMIZE_SPEED & 0x02))
	{
		$result=dol_setshmop($memoryid,$data);
	}

	return $result;
}

/**
 * 	Read a memory area shared by all users, all sessions on server
 *
 *  @param	string	$memoryid		Memory id of shared area
 * 	@return	int						<0 if KO, data if OK
 */
function dol_getcache($memoryid)
{
	global $conf;

	// Using a memcached server
	if (! empty($conf->memcached->enabled) && class_exists('Memcached'))
	{
		global $m;
		if (empty($m) || ! is_object($m))
    	{
            $m=new Memcached();
       		$tmparray=explode(':',$conf->global->MEMCACHED_SERVER);
       		$result=$m->addServer($tmparray[0], $tmparray[1]?$tmparray[1]:11211);
       		if (! $result) return -1;
       	}
	    
		$memoryid=session_name().'_'.$memoryid;
		//$m->setOption(Memcached::OPT_COMPRESSION, false);
		//print "Get memoryid=".$memoryid;
		$data=$m->get($memoryid);
		$rescode=$m->getResultCode();
		//print "memoryid=".$memoryid." - rescode=".$rescode." - data=".count($data)."\n<br>";
		//var_dump($data);
		if ($rescode == 0)
		{
			return $data;
		}
		else
		{
			return -$rescode;
		}
	}
	else if (! empty($conf->memcached->enabled) && class_exists('Memcache'))
	{
		global $m;
		if (empty($m) || ! is_object($m))
    	{
       	    $m=new Memcache();
       		$tmparray=explode(':',$conf->global->MEMCACHED_SERVER);
       		$result=$m->addServer($tmparray[0], $tmparray[1]?$tmparray[1]:11211);
       		if (! $result) return -1;
       	}
	    
       	$memoryid=session_name().'_'.$memoryid;
		//$m->setOption(Memcached::OPT_COMPRESSION, false);
		$data=$m->get($memoryid);
		//print "memoryid=".$memoryid." - rescode=".$rescode." - data=".count($data)."\n<br>";
		//var_dump($data);
		if ($data)
		{
			return $data;
		}
		else
		{
			return -1;
		}
	}
	// Using shmop
	else if (isset($conf->global->MAIN_OPTIMIZE_SPEED) && ($conf->global->MAIN_OPTIMIZE_SPEED & 0x02))
	{
		$data=dol_getshmop($memoryid);
		return $data;
	}

	return 0;
}


/**
 * 	Return shared memory address used to store dataset with key memoryid
 *
 *  @param	string	$memoryid		Memory id of shared area ('main', 'agenda', ...)
 * 	@return	int						<0 if KO, Memoy address of shared memory for key
 */
function dol_getshmopaddress($memoryid)
{
	global $shmkeys,$shmoffset;
	if (empty($shmkeys[$memoryid])) return 0;
	return $shmkeys[$memoryid]+$shmoffset;
}

/**
 * 	Return list of contents of all memory area shared
 *
 * 	@return	array
 */
function dol_listshmop()
{
	global $shmkeys,$shmoffset;

	$resarray=array();
	foreach($shmkeys as $key => $val)
	{
		$result=dol_getshmop($key);
		if (! is_numeric($result) || $result > 0) $resarray[$key]=$result;
	}
	return $resarray;
}

/**
 * 	Save data into a memory area shared by all users, all sessions on server
 *
 *  @param	int		$memoryid		Memory id of shared area ('main', 'agenda', ...)
 * 	@param	string	$data			Data to save
 * 	@return	int						<0 if KO, Nb of bytes written if OK
 */
function dol_setshmop($memoryid,$data)
{
	global $shmkeys,$shmoffset;

	//print 'dol_setshmop memoryid='.$memoryid."<br>\n";
	if (empty($shmkeys[$memoryid]) || ! function_exists("shmop_write")) return 0;
	$shmkey=dol_getshmopaddress($memoryid);
	$newdata=serialize($data);
	$size=strlen($newdata);
	//print 'dol_setshmop memoryid='.$memoryid." shmkey=".$shmkey." newdata=".$size."bytes<br>\n";
	$handle=shmop_open($shmkey,'c',0644,6+$size);
	if ($handle)
	{
		$shm_bytes_written1=shmop_write($handle,str_pad($size,6),0);
		$shm_bytes_written2=shmop_write($handle,$newdata,6);
		if (($shm_bytes_written1 + $shm_bytes_written2) != (6+dol_strlen($newdata)))
		{
   			print "Couldn't write the entire length of data\n";
		}
		shmop_close($handle);
		return ($shm_bytes_written1+$shm_bytes_written2);
	}
	else
	{
		print 'Error in shmop_open for memoryid='.$memoryid.' shmkey='.$shmkey.' 6+size=6+'.$size;
		return -1;
	}
}

/**
 * 	Read a memory area shared by all users, all sessions on server
 *
 *  @param	string	$memoryid		Memory id of shared area ('main', 'agenda', ...)
 * 	@return	int						<0 if KO, data if OK
 */
function dol_getshmop($memoryid)
{
	global $shmkeys,$shmoffset;

	if (empty($shmkeys[$memoryid]) || ! function_exists("shmop_open")) return 0;
	$shmkey=dol_getshmopaddress($memoryid);
	//print 'dol_getshmop memoryid='.$memoryid." shmkey=".$shmkey."<br>\n";
	$handle=@shmop_open($shmkey,'a',0,0);
	if ($handle)
	{
		$size=trim(shmop_read($handle,0,6));
		if ($size) $data=unserialize(shmop_read($handle,6,$size));
		else return -1;
		shmop_close($handle);
	}
	else
	{
		return -2;
	}
	return $data;
}