Fixed Renderer, to enbale multi-processing Rendering

git-svn-id: https://fhem.svn.sourceforge.net/svnroot/fhem/trunk/fhem@688 2b470e98-0d58-463d-a4d8-8e2adae1ed80

docs/commandref.html

@@ -5328,7 +5328,8 @@ isday</pre>
 <ul>
   The FHEMRENDERER module is intended to render (draw) graphics based on the FHEM Log-Files.
   This can be done either based on a timer (used in the module) or based on a direct call of GET.
-  The rendered graphics will be stored in a pre-defined directory with a predefined prefix of the files.
+  The rendered graphics will be stored in a pre-defined directory with a predefined prefix of the files. The renderer can also work in a multi-process mode,
+  which doesn't block the main FHEM-Loop.
   <br> <br>
 
   <a name="FHEMRENDERERdefine"></a>
@@ -5340,12 +5341,13 @@ isday</pre>
         Otherwise this option has no real meaning for FHEMRENDERER.<br>
         <br>
         As a side-effect of defining this "device" the following attributes will be set for this "device":<br>
-		&nbsp;&nbsp;plotmode	gnuplot	<br>
+		&nbsp;&nbsp;plotmode		gnuplot	<br>
-		&nbsp;&nbsp;plotsize	800,200 <br>
+		&nbsp;&nbsp;plotsize		800,200 <br>
-		&nbsp;&nbsp;refresh		00:10:00 <br>
+		&nbsp;&nbsp;refresh			00:10:00 <br>
-		&nbsp;&nbsp;room		Unsorted <br>
+		&nbsp;&nbsp;room			Unsorted <br>
-		&nbsp;&nbsp;status		off <br>
+		&nbsp;&nbsp;status			off <br>
-		&nbsp;&nbsp;tmpfile		/tmp/ <br>
+		&nbsp;&nbsp;tmpfile			/tmp/ <br>
+		&nbsp;&nbsp;multiprocess	off <br>
 <br>
         NOTE: The Logfile will report (with LogLevel 2) that the FHEMRENDERER has been defined.
 
@@ -5448,7 +5450,16 @@ isday</pre>
         filenames.<br/> You can specify a path to which the files will be
         rendered. If you also specify a prefix, this will be used to build the
         resulting filename.
-        </li><br> </li> </ul>
+        </li><br> 
+    <li>multiprocess<br/>
+        This defines if the Renderer works in a multiprocessing mode.<br/> 
+		You can set multiprocessing either to ON / OFF and the renderer will draw the
+		time-scheduled tasks either in multiprocessing mode, or not.
+		NOTE: Direct GET calls, except for a general GET (for all weblinks) will be renderer
+		in an interactive mode, meaning that the FHEM-Loop will be block as long as the graphics are rendered.
+		If you want to use multiprocessing, set the RENDERER and multiprocessing to ON and the
+		weblink-graphics will be rendered in the background.
+        </li><br></li> </ul>
   </ul>
 
 </ul>

webfrontend/pgm5/02_FHEMRENDERER.pm

@@ -84,6 +84,7 @@ my $__data;                     # Filecontent from browser when editing a file
 my $__svgloaded;                # Do not load the SVG twice
 my $__lastxmllist;              # last time xmllist was parsed
 my $FHEMRENDERER_tmpfile;       # TempDir & File for the rendered graphics
+my $__mp;
 
 #####################################
 sub
@@ -94,7 +95,7 @@ FHEMRENDERER_Initialize($)
 #  $hash->{ReadFn}  = "FHEMRENDERER_Read";
   $hash->{DefFn}   = "FHEMRENDERER_Define";
   $hash->{UndefFn} = "FHEMRENDERER_Undef";
-  $hash->{AttrList}= "loglevel:0,1,2,3,4,5,6 plotmode:gnuplot,gnuplot-scroll plotsize refresh tmpfile status";
+  $hash->{AttrList}= "loglevel:0,1,2,3,4,5,6 plotmode:gnuplot,gnuplot-scroll plotsize refresh tmpfile status multiprocess";
   $hash->{SetFn}   = "FHEMRENDERER_Set";
   $hash->{GetFn}   = "FHEMRENDERER_Get";
 }
@@ -121,6 +122,7 @@ FHEMRENDERER_Define($$)
   $__timeinterval = FHEMRENDERER_getAttr("refresh", "00:10:00");
   $__plotmode = FHEMRENDERER_getAttr("plotmode", "gnuplot");
   $__plotsize = FHEMRENDERER_getAttr("plotsize", "800,200");
+  $__mp = FHEMRENDERER_getAttr("multiprocess", "off");
   $FHEMRENDERER_tmpfile = FHEMRENDERER_getAttr("tmpfile", "/tmp/");
   FHEMRENDERER_setAttr("status", "off");
   
@@ -174,6 +176,7 @@ FHEMRENDERER_Get($@)
   my $ret = undef;
   my $v;
   my $t;
+  my $pid;
   
 	FHEMRENDERER_parseXmlList(0);
 
@@ -183,8 +186,9 @@ FHEMRENDERER_Get($@)
   $__plotmode = FHEMRENDERER_getAttr("plotmode", "gnuplot");
   $__plotsize = FHEMRENDERER_getAttr("plotsize", "800,200");
   $FHEMRENDERER_tmpfile = FHEMRENDERER_getAttr("tmpfile", "/tmp/");
+  $__mp = FHEMRENDERER_getAttr("multiprocess", "off");
   
-  if (@a <= 2) {
+   if (@a <= 2) {
   	if (@a == 2) {
   		my ($p,$v) = split("=",$a[1], 2);
 
@@ -197,6 +201,16 @@ FHEMRENDERER_Get($@)
       }
     }
 
+	  if ($__mp ne "off") {
+	  	$pid = fork();
+	  	if (not defined $pid) {
+	  		return ("ERROR: No MultiProcessing possible");
+	  	}
+	  	if ($pid > 0) {
+	  		return $ret;
+	  	}
+  	}
+
     foreach my $type (sort keys %__types) {
 	  	if($type eq "weblink") {
       	foreach my $d (sort keys %__devs ) {
@@ -255,7 +269,11 @@ FHEMRENDERER_Get($@)
   } else {
   	return "\"get FHEMRENDERER\" needs either none, 1(pos) or 3-5 arguments ([file-name] device type logfile [pos=zoom=XX&off=YYY])";
   }
-	return $ret;
+ 	if (not defined $pid) {
+		return $ret;
+	} else {
+		exit(0);
+	}
 }
 
 #####################

webfrontend/pgm5/README-FHEMRENDERER.txt

@@ -47,12 +47,15 @@ The FHEMRENDERER uses attributes to control the behaviour:
 		room		Unsorted
 		status		off
 		tmpfile		/tmp/
+		multiprocess	off
 
 These attributes have the following meaning:
 plotmode, plotsize: 	Control gnuplot and the desired output
 refresh: 		type HH:MM:SS, is the time-interval in which the re-rendering is done
 status:  		Tells if the timer-based re-rendering is on/off
 tmpfile:		Is the path (and prefix, if given) of the graphic-files, that will be rendered
+multiprocess:		You can set "on" or "off". If multiprocess is "on" the time-scheduled renderings will be done in a 
+                        mutli-process manner, and FHEM will not be blocked by the rendering process. 
 
 NOTE: The timer-based rendering renders ONLY those fileplots, for which you have defined a WebLink !
       See WebLink for more details on how to define.
@@ -88,6 +91,7 @@ DEFINE
 		room		Unsorted
 		status		off
 		tmpfile		/tmp/
+		multiprocess	off
 
         
         NOTE: The Logfile will report (with LogLevel 2) that the FHEMRENDERER has been defined.
@@ -169,6 +173,7 @@ ATTR
 		refresh		Timer-Interval for rerendering (HH:MM:SS)
 		status		Status of the Timer (off/on)
 		tmpfile		Path and prefix of for the rendered graphics (e.g. /tmp/)
+		multiprocess	on / off