| <?php | |
| /* | |
| pCache - speed up the rendering by caching up the pictures | |
| Version : 2.1.0 | |
| Made by : Jean-Damien POGOLOTTI | |
| Last Update : 26/01/11 | |
| 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); | |
| } | |
| 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); | |
| } | |
| } | |
| ?> |