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SemmelstatzR/trunk/includes/pChart/class/pCache.class.php
oldperl bdf227442d edit: phpdoc stuff 
add: pChart lib - no more usage of google api. There has to be the wp-content/cache writable for images
add: test-folder for later use
new: class agents, new isBot-functionality within this class, old function is deprecated, uses an ini-file with botnames
2011-11-14 14:21:22 +00:00

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<?php
/*
pCache - speed up the rendering by caching up the pictures
Version : 2.1.3
Made by : Jean-Damien POGOLOTTI
Last Update : 09/09/11
This file can be distributed under the license you can find at :
http://www.pchart.net/license
You can find the whole class documentation on the pChart web site.
*/
/* pData class definition */
class pCache
{
var $CacheFolder;
var $CacheIndex;
var $CacheDB;
/* Class creator */
function pCache($Settings="")
{
$CacheFolder = isset($Settings["CacheFolder"]) ? $Settings["CacheFolder"] : "cache";
$CacheIndex = isset($Settings["CacheIndex"]) ? $Settings["CacheIndex"] : "index.db";
$CacheDB = isset($Settings["CacheDB"]) ? $Settings["CacheDB"] : "cache.db";
$this->CacheFolder = $CacheFolder;
$this->CacheIndex = $CacheIndex;
$this->CacheDB = $CacheDB;
if (!file_exists($this->CacheFolder."/".$this->CacheIndex)) { touch($this->CacheFolder."/".$this->CacheIndex); }
if (!file_exists($this->CacheFolder."/".$this->CacheDB)) { touch($this->CacheFolder."/".$this->CacheDB); }
}
/* Flush the cache contents */
function flush()
{
if (file_exists($this->CacheFolder."/".$this->CacheIndex)) { unlink($this->CacheFolder."/".$this->CacheIndex); touch($this->CacheFolder."/".$this->CacheIndex); }
if (file_exists($this->CacheFolder."/".$this->CacheDB)) { unlink($this->CacheFolder."/".$this->CacheDB); touch($this->CacheFolder."/".$this->CacheDB); }
}
/* Return the MD5 of the data array to clearly identify the chart */
function getHash($Data,$Marker="")
{ return(md5($Marker.serialize($Data->Data))); }
/* Write the generated picture to the cache */
function writeToCache($ID,$pChartObject)
{
/* Compute the paths */
$TemporaryFile = $this->CacheFolder."/tmp_".rand(0,1000).".png";
$Database = $this->CacheFolder."/".$this->CacheDB;
$Index = $this->CacheFolder."/".$this->CacheIndex;
/* Flush the picture to a temporary file */
imagepng($pChartObject->Picture ,$TemporaryFile);
/* Retrieve the files size */
$PictureSize = filesize($TemporaryFile);
$DBSize = filesize($Database);
/* Save the index */
$Handle = fopen($Index,"a");
fwrite($Handle, $ID.",".$DBSize.",".$PictureSize.",".time().",0 \r\n");
fclose($Handle);
/* Get the picture raw contents */
$Handle = fopen($TemporaryFile,"r");
$Raw = fread($Handle,$PictureSize);
fclose($Handle);
/* Save the picture in the solid database file */
$Handle = fopen($Database,"a");
fwrite($Handle, $Raw);
fclose($Handle);
/* Remove temporary file */
unlink($TemporaryFile);
}
/* Remove object older than the specified TS */
function removeOlderThan($Expiry)
{ $this->dbRemoval(array("Expiry"=>$Expiry)); }
/* Remove an object from the cache */
function remove($ID)
{ $this->dbRemoval(array("Name"=>$ID)); }
/* Remove with specified criterias */
function dbRemoval($Settings)
{
$ID = isset($Settings["Name"]) ? $Settings["Name"] : NULL;
$Expiry = isset($Settings["Expiry"]) ? $Settings["Expiry"] : -(24*60*60);
$TS = time()-$Expiry;
/* Compute the paths */
$Database = $this->CacheFolder."/".$this->CacheDB;
$Index = $this->CacheFolder."/".$this->CacheIndex;
$DatabaseTemp = $this->CacheFolder."/".$this->CacheDB.".tmp";
$IndexTemp = $this->CacheFolder."/".$this->CacheIndex.".tmp";
/* Single file removal */
if ( $ID != NULL )
{
/* Retrieve object informations */
$Object = $this->isInCache($ID,TRUE);
/* If it's not in the cache DB, go away */
if ( !$Object ) { return(0); }
}
/* Create the temporary files */
if (!file_exists($DatabaseTemp)) { touch($DatabaseTemp); }
if (!file_exists($IndexTemp)) { touch($IndexTemp); }
/* Open the file handles */
$IndexHandle = @fopen($Index, "r");
$IndexTempHandle = @fopen($IndexTemp, "w");
$DBHandle = @fopen($Database, "r");
$DBTempHandle = @fopen($DatabaseTemp, "w");
/* Remove the selected ID from the database */
while (!feof($IndexHandle))
{
$Entry = fgets($IndexHandle, 4096);
$Entry = str_replace("\r","",$Entry);
$Entry = str_replace("\n","",$Entry);
$Settings = preg_split("/,/",$Entry);
if ( $Entry != "" )
{
$PicID = $Settings[0];
$DBPos = $Settings[1];
$PicSize = $Settings[2];
$GeneratedTS = $Settings[3];
$Hits = $Settings[4];
if ( $Settings[0] != $ID && $GeneratedTS > $TS)
{
$CurrentPos = ftell($DBTempHandle);
fwrite($IndexTempHandle, $PicID.",".$CurrentPos.",".$PicSize.",".$GeneratedTS.",".$Hits."\r\n");
fseek($DBHandle,$DBPos);
$Picture = fread($DBHandle,$PicSize);
fwrite($DBTempHandle,$Picture);
}
}
}
/* Close the handles */
fclose($IndexHandle);
fclose($IndexTempHandle);
fclose($DBHandle);
fclose($DBTempHandle);
/* Remove the prod files */
unlink($Database);
unlink($Index);
/* Swap the temp & prod DB */
rename($DatabaseTemp,$Database);
rename($IndexTemp,$Index);
}
function isInCache($ID,$Verbose=FALSE,$UpdateHitsCount=FALSE)
{
/* Compute the paths */
$Index = $this->CacheFolder."/".$this->CacheIndex;
/* Search the picture in the index file */
$Handle = @fopen($Index, "r");
while (!feof($Handle))
{
$IndexPos = ftell($Handle);
$Entry = fgets($Handle, 4096);
if ( $Entry != "" )
{
$Settings = preg_split("/,/",$Entry);
$PicID = $Settings[0];
if ( $PicID == $ID )
{
fclose($Handle);
$DBPos = $Settings[1];
$PicSize = $Settings[2];
$GeneratedTS = $Settings[3];
$Hits = intval($Settings[4]);
if ( $UpdateHitsCount )
{
$Hits++;
if ( strlen($Hits) < 7 ) { $Hits = $Hits.str_repeat(" ",7-strlen($Hits)); }
$Handle = @fopen($Index, "r+");
fseek($Handle,$IndexPos);
fwrite($Handle, $PicID.",".$DBPos.",".$PicSize.",".$GeneratedTS.",".$Hits."\r\n");
fclose($Handle);
}
if ($Verbose)
{ return(array("DBPos"=>$DBPos,"PicSize"=>$PicSize,"GeneratedTS"=>$GeneratedTS,"Hits"=>$Hits)); }
else
{ return(TRUE); }
}
}
}
fclose($Handle);
/* Picture isn't in the cache */
return(FALSE);
}
/* Automatic output method based on the calling interface */
function autoOutput($ID,$Destination="output.png")
{
if (php_sapi_name() == "cli")
$this->saveFromCache($ID,$Destination);
else
$this->strokeFromCache($ID);
}
function strokeFromCache($ID)
{
/* Get the raw picture from the cache */
$Picture = $this->getFromCache($ID);
/* Do we have a hit? */
if ( $Picture == NULL ) { return(FALSE); }
header('Content-type: image/png');
echo $Picture;
return(TRUE);
}
function saveFromCache($ID,$Destination)
{
/* Get the raw picture from the cache */
$Picture = $this->getFromCache($ID);
/* Do we have a hit? */
if ( $Picture == NULL ) { return(FALSE); }
/* Flush the picture to a file */
$Handle = fopen($Destination,"w");
fwrite($Handle,$Picture);
fclose($Handle);
/* All went fine */
return(TRUE);
}
function getFromCache($ID)
{
/* Compute the path */
$Database = $this->CacheFolder."/".$this->CacheDB;
/* Lookup for the picture in the cache */
$CacheInfo = $this->isInCache($ID,TRUE,TRUE);
/* Not in the cache */
if (!$CacheInfo) { return(NULL); }
/* Get the database extended information */
$DBPos = $CacheInfo["DBPos"];
$PicSize = $CacheInfo["PicSize"];
/* Extract the picture from the solid cache file */
$Handle = @fopen($Database, "r");
fseek($Handle,$DBPos);
$Picture = fread($Handle,$PicSize);
fclose($Handle);
/* Return back the raw picture data */
return($Picture);
}
}
?>
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