Viewing file:  locking.php (11.88 KB) -rw-r--r--
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<?php
class oLocking
{
var $lockTableName = "";
var $ConfirmTime=250;
var $UnlockTime=300;
var $ConfirmAdmin;
var $ConfirmUser;
var $LockAdmin;
var $LockUser;
var $UserID;
/**
* @type Connection
*/
protected $connection;
/**
* @constructor
*/
function __construct()
{
global $cman;
$this->ConfirmAdmin = "Administrator %s aborted your edit session";
$this->ConfirmUser = "Your edit session timed out";
$this->LockAdmin = "Record is edited by %s during %s minutes";
$this->LockUser = "Record is edited by another user";
$this->connection = $cman->getForLocking();
if(isset($_SESSION["UserID"]) && !is_null($_SESSION["UserID"]))
$this->UserID = $_SESSION["UserID"];
else
$this->UserID = "Guest";
}
function LockRecord($strtable,$keys)
{
$skeys = "";
foreach($keys as $ind=>$val)
{
if(strlen($skeys))
$skeys.="&";
$skeys.=rawurlencode($val);
}
$sdate = now();
// add a record - try to lock
$this->insert($strtable, $sdate, $sdate, $skeys, session_id(), $this->UserID, 1);
$arrDelete = array();
// check all locking records
$where = $this->connection->addFieldWrappers("table")."=".$this->connection->prepareString($strtable)
." AND ".$this->connection->addFieldWrappers("keys")."=".$this->connection->prepareString($skeys)
." AND ".$this->connection->addFieldWrappers("action")."=1";
$qResult = $this->query( $where, $this->connection->addFieldWrappers("id")." asc" );
while( $data = $qResult->fetchAssoc() )
{
if(secondsPassedFrom($data["confirmdatetime"])>$this->UnlockTime)
{
// locking record is expired
$arrDelete[]=$data["id"];
}
else
{
// delete expired records
foreach($arrDelete as $ind=>$val)
{
$this->delete($this->connection->addFieldWrappers("id"). "=" .$val);
}
if($data["sessionid"]==session_id())
{
// locking was successful
return true;
}
else
{
// record is already locked, delete locking attempt
$where = $this->connection->addFieldWrappers("sessionid"). "=" .$this->connection->prepareString(session_id()) ." AND ".
$this->connection->addFieldWrappers("action"). "=1" ." AND ".
$this->connection->addFieldWrappers("table"). "=" .$this->connection->prepareString($strtable) ." AND ".
$this->connection->addFieldWrappers("keys"). "=" .$this->connection->prepareString($skeys);
$this->delete($where);
return false;
}
}
}
return false;
}
function UnlockRecord($strtable,$keys,$sid)
{
if($sid=="")
$sid=session_id();
$skeys="";
foreach($keys as $ind=>$val)
{
if(strlen($skeys))
$skeys.="&";
$skeys.=rawurlencode($val);
}
$where = $this->connection->addFieldWrappers("sessionid"). "=" .$this->connection->prepareString($sid) ." AND ".
$this->connection->addFieldWrappers("action"). "=1 AND ".
$this->connection->addFieldWrappers("table"). "=" .$this->connection->prepareString($strtable) ." AND ".
$this->connection->addFieldWrappers("keys"). "=" .$this->connection->prepareString($skeys);
$this->delete($where);
}
function ConfirmLock($strtable,$keys,&$message)
{
$skeys="";
foreach($keys as $ind=>$val)
{
if(strlen($skeys))
$skeys.="&";
$skeys.=rawurlencode($val);
}
// add locking attempt
$sdate = now();
$this->insert($strtable, $sdate, $sdate, $skeys, session_id(), $this->UserID, 1);
$where = $this->connection->addFieldWrappers("table")."=".$this->connection->prepareString($strtable)
." AND ".$this->connection->addFieldWrappers("keys")."=".$this->connection->prepareString($skeys)
." AND ".$this->connection->addFieldWrappers("action")."=1";
$qResult = $this->query( $where, $this->connection->addFieldWrappers("id")." asc" );
$myfound=0; // total our records found
$newid=0; // last our record - added 5 lines ago
$oldid=0; // next to last our record
$newdate=""; // last our confirm time
$olddate=""; // next to last our confirm time
$otherfound=0; // other's records found between out last and next to last
$tempfound=0;
// check all locking records, count records
while( $data = $qResult->fetchAssoc() )
{
if($data["sessionid"]==session_id())
{
$oldid=$newid;
$newid=$data["id"];
$newdate=$data["confirmdatetime"];
$olddate=$newdate;
$myfound++;
$otherfound=$tempfound;
$tempfound=0;
continue;
}
$tempfound++;
}
if($myfound>1 && !$otherfound)
{
// no other's records, locking is confirmed
$this->update($this->connection->addFieldWrappers("confirmdatetime"). "=" .$this->connection->addDateQuotes(now()),
$this->connection->addFieldWrappers("id"). "=" .$oldid);
$this->delete($this->connection->addFieldWrappers("id"). "=" .$newid);
return true;
}
elseif($myfound>1 && $otherfound)
{
// found some other's records
// check if previous record is not expired
if(secondsPassedFrom($olddate)>$this->UnlockTime-5)
{
// expired - delete locking record, confirm was not successful
$this->UnlockRecord($strtable,$keys,session_id());
$message=$this->ConfirmUser;
return false;
}
else
{
// not expired, locking is confirmed
$this->update($this->connection->addFieldWrappers("confirmdatetime"). "=" .$this->connection->addDateQuotes(now()),
$this->connection->addFieldWrappers("id"). "=" .$oldid);
$this->delete($this->connection->addFieldWrappers("id"). "=" .$newid);
return true;
}
}
else
{
// locking was lost
$this->UnlockRecord($strtable,$keys,session_id());
// check if locking was removed by admin or not
$where = $this->connection->addFieldWrappers("table")."=".$this->connection->prepareString($strtable)
." AND ".$this->connection->addFieldWrappers("keys")."=".$this->connection->prepareString($skeys)
." AND ".$this->connection->addFieldWrappers("sessionid")."<>'".session_id()
."' AND ".$this->connection->addFieldWrappers("action")."=2";
if($data = $this->query( $where, $this->connection->addFieldWrappers("id")." asc" )->fetchAssoc())
$message = mysprintf($this->ConfirmAdmin,array($data["userid"]));
else
$message = $this->ConfirmUser;
$where = $this->connection->addFieldWrappers("action"). "=2 AND ".
$this->connection->addFieldWrappers("table"). "=" .$this->connection->prepareString($strtable) ." AND ".
$this->connection->addFieldWrappers("keys"). "=" .$this->connection->prepareString($skeys);
$this->delete($where);
return false;
}
}
function GetLockInfo($strtable,$keys,$links, $pageid)
{
$page=GetTableLink(GetTableURL($strtable), "edit");
$skeys="";
foreach($keys as $ind=>$val){
if(strlen($skeys))
$skeys.="&";
$skeys.=rawurlencode($val);
}
$where = $this->connection->addFieldWrappers("table")."=".$this->connection->prepareString($strtable)
." AND ".$this->connection->addFieldWrappers("keys")."=".$this->connection->prepareString($skeys)
." AND ".$this->connection->addFieldWrappers("sessionid")."<>'".session_id()
."' AND ".$this->connection->addFieldWrappers("action")."=1";
$qResult = $this->query( $where, $this->connection->addFieldWrappers("id")." asc" );
if( $data = $qResult->fetchAssoc() )
{
$sdate = now();
$arrDateTime = db2time($data["startdatetime"]);
$str = mysprintf($this->LockAdmin,array($data["userid"],round(secondsPassedFrom($data["startdatetime"])/60,2)));
if($links){
$str.='<a class="unlock" href="#" onclick="Runner.pages.PageManager.getAt(\''.runner_htmlspecialchars(jsreplace($strtable)).'\', '.$pageid.').locking.UnlockAdmin(\''
.runner_htmlspecialchars(jsreplace($skeys)).'\',\''.$data["sessionid"].'\',\'no\');return false;">'."Unlock record".'</a>';
$str.='<a class="edit" href="#" onclick="Runner.pages.PageManager.getAt(\''.runner_htmlspecialchars(jsreplace($strtable)).'\', '.$pageid.').locking.UnlockAdmin(\''
.runner_htmlspecialchars(jsreplace($skeys)).'\',\''.$data["sessionid"].'\',\'yes\');return false;">'."Edit record".'</a>';
}
return $str;
}
return "";
}
function UnlockAdmin($strtable, $keys, $startEdit)
{
$skeys = "";
foreach($keys as $ind=>$val)
{
if(strlen($skeys))
$skeys .= "&";
$skeys .= rawurlencode($val);
}
$sdate = now();
if($startEdit)
{
// add a record - lock
$this->insert($strtable, $sdate, $sdate, $skeys, session_id(), $this->UserID, 1);
}
// delete all other locking records
$where = $this->connection->addFieldWrappers("table")."=".$this->connection->prepareString($strtable)
." AND ".$this->connection->addFieldWrappers("keys")."=".$this->connection->prepareString($skeys)
." AND ".$this->connection->addFieldWrappers("action")."=1 AND ".$this->connection->addFieldWrappers("sessionid")."<>".$this->connection->prepareString(session_id());
$this->delete( $where );
// inform other users that their locking were removed by locking
$where = $this->connection->addFieldWrappers("startdatetime")."<".$this->connection->addDateQuotes(format_datetime_custom( adddays(db2time(now()), -2), "yyyy-MM-dd HH:mm:ss" ))
." AND ".$this->connection->addFieldWrappers("action")."=2";
$this->delete( $where );
$this->insert($strtable, $sdate, $sdate, $skeys, session_id(), $this->UserID, 2);
}
/**
* Check if there is any record with particular
* fields' values in the 'locking' table
* @param String table
* @param String keys
* @param String action
* @return Boolean
*/
public function isLocked( $table, $keys, $action )
{
$lockSQL = "select count(*) from ". $this->connection->addTableWrappers( $this->lockTableName )
." where ". $this->connection->addFieldWrappers("keys") ."=". $this->connection->prepareString( $lockWhere )
." AND ". $this->connection->addFieldWrappers("table") ."=". $this->connection->prepareString( $table )
." AND ". $this->connection->addFieldWrappers("action") ."=". $action;
$lockSet = $this->connection->query( $lockSQL )->fetchNumeric();
return $lockSet[0] > 0;
}
protected function insert($table, $startdatetime, $confirmdatetime, $keys, $sessionid, $userid, $action)
{
$sql = "INSERT INTO " .$this->connection->addTableWrappers( $this->lockTableName ).
" (" .$this->connection->addFieldWrappers("table").
"," .$this->connection->addFieldWrappers("startdatetime").
"," .$this->connection->addFieldWrappers("confirmdatetime").
"," .$this->connection->addFieldWrappers("keys").
"," .$this->connection->addFieldWrappers("sessionid").
"," .$this->connection->addFieldWrappers("userid").
"," .$this->connection->addFieldWrappers("action").
") VALUES (" .$this->connection->prepareString($table).
"," .$this->connection->addDateQuotes($startdatetime).
"," .$this->connection->addDateQuotes($confirmdatetime).
"," .$this->connection->prepareString($keys).
"," .$this->connection->prepareString($sessionid).
"," .$this->connection->prepareString($this->UserID).
"," .$action.
")";
return $this->connection->exec( $sql );
}
protected function query($where, $orderBy)
{
if(!$where)
return;
$sql = "SELECT * FROM " .$this->connection->addTableWrappers( $this->lockTableName ). " WHERE " .$where. " ORDER BY " .$orderBy;
return $this->connection->query( $sql );
}
protected function delete($where)
{
if(!$where)
return;
$sql = "DELETE FROM " .$this->connection->addTableWrappers( $this->lockTableName ). " WHERE " .$where;
$this->connection->exec( $sql );
}
protected function update($values, $where)
{
if(!$where || !$values)
return;
$sql = "UPDATE " .$this->connection->addTableWrappers( $this->lockTableName ). " SET " .$values. " WHERE " .$where;
$this->connection->exec( $sql );
}
}
?>
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