280 lines
8.6 KiB
PHP
280 lines
8.6 KiB
PHP
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<?php
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/*
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pCache - speed up the rendering by caching up the pictures
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Version : 2.1.4
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Made by : Jean-Damien POGOLOTTI
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Last Update : 19/01/2014
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This file can be distributed under the license you can find at :
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http://www.pchart.net/license
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You can find the whole class documentation on the pChart web site.
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*/
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/* pData class definition */
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class pCache
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{
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var $CacheFolder;
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var $CacheIndex;
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var $CacheDB;
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/* Class creator */
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function pCache($Settings="")
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{
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$CacheFolder = isset($Settings["CacheFolder"]) ? $Settings["CacheFolder"] : "cache";
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$CacheIndex = isset($Settings["CacheIndex"]) ? $Settings["CacheIndex"] : "index.db";
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$CacheDB = isset($Settings["CacheDB"]) ? $Settings["CacheDB"] : "cache.db";
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$this->CacheFolder = $CacheFolder;
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$this->CacheIndex = $CacheIndex;
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$this->CacheDB = $CacheDB;
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if (!file_exists($this->CacheFolder."/".$this->CacheIndex)) { touch($this->CacheFolder."/".$this->CacheIndex); }
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if (!file_exists($this->CacheFolder."/".$this->CacheDB)) { touch($this->CacheFolder."/".$this->CacheDB); }
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}
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/* Flush the cache contents */
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function flush()
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{
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if (file_exists($this->CacheFolder."/".$this->CacheIndex)) { unlink($this->CacheFolder."/".$this->CacheIndex); touch($this->CacheFolder."/".$this->CacheIndex); }
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if (file_exists($this->CacheFolder."/".$this->CacheDB)) { unlink($this->CacheFolder."/".$this->CacheDB); touch($this->CacheFolder."/".$this->CacheDB); }
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}
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/* Return the MD5 of the data array to clearly identify the chart */
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function getHash($Data,$Marker="")
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{ return(md5($Marker.serialize($Data->Data))); }
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/* Write the generated picture to the cache */
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function writeToCache($ID,$pChartObject)
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{
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/* Compute the paths */
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$TemporaryFile = $this->CacheFolder."/tmp_".rand(0,1000).".png";
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$Database = $this->CacheFolder."/".$this->CacheDB;
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$Index = $this->CacheFolder."/".$this->CacheIndex;
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/* Flush the picture to a temporary file */
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imagepng($pChartObject->Picture ,$TemporaryFile);
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/* Retrieve the files size */
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$PictureSize = filesize($TemporaryFile);
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$DBSize = filesize($Database);
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/* Save the index */
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$Handle = fopen($Index,"a");
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fwrite($Handle, $ID.",".$DBSize.",".$PictureSize.",".time().",0 \r\n");
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fclose($Handle);
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/* Get the picture raw contents */
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$Handle = fopen($TemporaryFile,"r");
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$Raw = fread($Handle,$PictureSize);
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fclose($Handle);
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/* Save the picture in the solid database file */
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$Handle = fopen($Database,"a");
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fwrite($Handle, $Raw);
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fclose($Handle);
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/* Remove temporary file */
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unlink($TemporaryFile);
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}
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/* Remove object older than the specified TS */
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function removeOlderThan($Expiry)
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{ $this->dbRemoval(array("Expiry"=>$Expiry)); }
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/* Remove an object from the cache */
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function remove($ID)
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{ $this->dbRemoval(array("Name"=>$ID)); }
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/* Remove with specified criterias */
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function dbRemoval($Settings)
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{
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$ID = isset($Settings["Name"]) ? $Settings["Name"] : NULL;
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$Expiry = isset($Settings["Expiry"]) ? $Settings["Expiry"] : -(24*60*60);
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$TS = time()-$Expiry;
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/* Compute the paths */
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$Database = $this->CacheFolder."/".$this->CacheDB;
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$Index = $this->CacheFolder."/".$this->CacheIndex;
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$DatabaseTemp = $this->CacheFolder."/".$this->CacheDB.".tmp";
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$IndexTemp = $this->CacheFolder."/".$this->CacheIndex.".tmp";
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/* Single file removal */
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if ( $ID != NULL )
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{
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/* Retrieve object informations */
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$Object = $this->isInCache($ID,TRUE);
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/* If it's not in the cache DB, go away */
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if ( !$Object ) { return(0); }
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}
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/* Create the temporary files */
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if (!file_exists($DatabaseTemp)) { touch($DatabaseTemp); }
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if (!file_exists($IndexTemp)) { touch($IndexTemp); }
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/* Open the file handles */
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$IndexHandle = @fopen($Index, "r");
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$IndexTempHandle = @fopen($IndexTemp, "w");
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$DBHandle = @fopen($Database, "r");
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$DBTempHandle = @fopen($DatabaseTemp, "w");
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/* Remove the selected ID from the database */
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while (!feof($IndexHandle))
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{
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$Entry = fgets($IndexHandle, 4096);
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$Entry = str_replace("\r","",$Entry);
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$Entry = str_replace("\n","",$Entry);
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$Settings = preg_split("/,/",$Entry);
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if ( $Entry != "" )
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{
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$PicID = $Settings[0];
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$DBPos = $Settings[1];
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$PicSize = $Settings[2];
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$GeneratedTS = $Settings[3];
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$Hits = $Settings[4];
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if ( $Settings[0] != $ID && $GeneratedTS > $TS)
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{
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$CurrentPos = ftell($DBTempHandle);
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fwrite($IndexTempHandle, $PicID.",".$CurrentPos.",".$PicSize.",".$GeneratedTS.",".$Hits."\r\n");
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fseek($DBHandle,$DBPos);
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$Picture = fread($DBHandle,$PicSize);
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fwrite($DBTempHandle,$Picture);
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}
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}
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}
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/* Close the handles */
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fclose($IndexHandle);
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fclose($IndexTempHandle);
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fclose($DBHandle);
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fclose($DBTempHandle);
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/* Remove the prod files */
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unlink($Database);
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unlink($Index);
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/* Swap the temp & prod DB */
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rename($DatabaseTemp,$Database);
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rename($IndexTemp,$Index);
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}
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function isInCache($ID,$Verbose=FALSE,$UpdateHitsCount=FALSE)
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{
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/* Compute the paths */
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$Index = $this->CacheFolder."/".$this->CacheIndex;
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/* Search the picture in the index file */
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$Handle = @fopen($Index, "r");
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while (!feof($Handle))
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{
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$IndexPos = ftell($Handle);
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$Entry = fgets($Handle, 4096);
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if ( $Entry != "" )
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{
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$Settings = preg_split("/,/",$Entry);
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$PicID = $Settings[0];
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if ( $PicID == $ID )
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{
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fclose($Handle);
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$DBPos = $Settings[1];
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$PicSize = $Settings[2];
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$GeneratedTS = $Settings[3];
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$Hits = intval($Settings[4]);
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if ( $UpdateHitsCount )
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{
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$Hits++;
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if ( strlen($Hits) < 7 ) { $Hits = $Hits.str_repeat(" ",7-strlen($Hits)); }
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$Handle = @fopen($Index, "r+");
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fseek($Handle,$IndexPos);
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fwrite($Handle, $PicID.",".$DBPos.",".$PicSize.",".$GeneratedTS.",".$Hits."\r\n");
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fclose($Handle);
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}
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if ($Verbose)
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{ return(array("DBPos"=>$DBPos,"PicSize"=>$PicSize,"GeneratedTS"=>$GeneratedTS,"Hits"=>$Hits)); }
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else
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{ return(TRUE); }
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}
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}
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}
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fclose($Handle);
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/* Picture isn't in the cache */
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return(FALSE);
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}
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/* Automatic output method based on the calling interface */
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function autoOutput($ID,$Destination="output.png")
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{
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if (php_sapi_name() == "cli")
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$this->saveFromCache($ID,$Destination);
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else
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$this->strokeFromCache($ID);
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}
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function strokeFromCache($ID)
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{
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/* Get the raw picture from the cache */
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$Picture = $this->getFromCache($ID);
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/* Do we have a hit? */
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if ( $Picture == NULL ) { return(FALSE); }
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header('Content-type: image/png');
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echo $Picture;
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return(TRUE);
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}
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function saveFromCache($ID,$Destination)
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{
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/* Get the raw picture from the cache */
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$Picture = $this->getFromCache($ID);
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/* Do we have a hit? */
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if ( $Picture == NULL ) { return(FALSE); }
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/* Flush the picture to a file */
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$Handle = fopen($Destination,"w");
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fwrite($Handle,$Picture);
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fclose($Handle);
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/* All went fine */
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return(TRUE);
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}
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function getFromCache($ID)
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{
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/* Compute the path */
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$Database = $this->CacheFolder."/".$this->CacheDB;
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/* Lookup for the picture in the cache */
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$CacheInfo = $this->isInCache($ID,TRUE,TRUE);
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/* Not in the cache */
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if (!$CacheInfo) { return(NULL); }
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/* Get the database extended information */
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$DBPos = $CacheInfo["DBPos"];
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$PicSize = $CacheInfo["PicSize"];
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/* Extract the picture from the solid cache file */
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$Handle = @fopen($Database, "r");
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fseek($Handle,$DBPos);
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$Picture = fread($Handle,$PicSize);
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fclose($Handle);
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/* Return back the raw picture data */
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return($Picture);
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}
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}
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?>
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