Caching bei GroupGraphs eingebaut

1 files changed, 28 insertions, 5 deletions

diff --git a/library/Pbs/Graph.php b/library/Pbs/Graph.php
index c924b59..78b88f8 100644
--- a/library/Pbs/Graph.php
+++ b/library/Pbs/Graph.php
@@ -26,11 +26,34 @@ class Pbs_Graph{
 		$this->graphstring .= '}';
 		$this->graphstring = str_replace(array("\t","\n"),"",$this->graphstring);
 		$this->graphstring = str_replace('"','\"',$this->graphstring);
-	      
-		$str =  'echo "';
-		$str .=  $this->graphstring;
-		$str .=  '" | dot -Tpng  ';					
-		passthru($str, $result);
+		
+		$md5 = md5($this->graphstring);
+		$path = "../resources/groupgraphs/";
+    	@mkdir($path ,0777, true);
+    	
+    	// randomly delete cached files, old files are not needed
+    	// so delete it sometimes
+		if(rand(0,20) == 1){
+			$days = "14"; // delete all files older than this many days
+			$seconds = ($days*24*60*60);
+
+			$files = scandir($path);			 
+			foreach ($files as $num => $fname){
+				if (file_exists("{$path}{$fname}") && ((time() - filemtime("{$path}{$fname}")) > $seconds)) {
+					$mod_time = filemtime("{$path}{$fname}");
+					unlink("{$path}{$fname}");
+				}
+			}
+		}
+		
+		if(!file_exists($path.$md5.".png")){	      
+			$str =  'echo "';
+			$str .=  $this->graphstring;
+			$str .=  '" | dot -Tpng  >'.$path.$md5.".png";
+			exec($str);
+		}
+		
+		passthru("cat ".$path.$md5.".png", $result);
 		return $result;
 	}
 	private function getGroupTitle($groupID){