html/graph.php

   1 <?php
   2
   3 require("config.php");
   4
   5 $IMGFILE="/tmp/power.svg";
   6
   7 $hours = array_key_exists('h', $_REQUEST) ? (int)$_REQUEST['h'] : 0;
   8 $minutes = array_key_exists('m', $_REQUEST) ? (int)$_REQUEST['m'] : 0;
   9 if (!$hours && !$minutes)
  10         $hours = 1;
  11 $params = [
  12         "--daemon", RRDSOCK,
  13         "--imgformat", "SVG",
  14         "-s", "now-".$hours."h".$minutes."m",
  15         "--width", "".IMGWIDTH,
  16         "--height", "".IMGHEIGHT,
  17         "--vertical-label", "watts",
  18         "--lower-limit", "0",
  19         "DEF:watts=".RRDFILE.":watts:AVERAGE",
  20         #"DEF:maxwatts=".RRDFILE.":watts:MAX:step=".(60*(60*$hours)+$minutes),
  21         #"DEF:maxwatts=".RRDFILE.":watts:MAX",
  22         "CDEF:wh_raw=watts,".(float)($hours+$minutes/60.).",*",
  23         "VDEF:watts_avg=watts,AVERAGE",
  24         "VDEF:wh=wh_raw,AVERAGE",
  25         "AREA:watts#FF0000",
  26         "LINE:watts_avg#00FF00",
  27         "GPRINT:watts_avg:Average %6.2lf %swatts",
  28         "GPRINT:wh:Total %6.2lf %swh",
  29         #"LINE:maxwatts#0000FF",
  30         #"GPRINT:maxwatts:Max %6.2lf %sW",
  31 ];
  32
  33 /*header("Content-Type: text/plain");
  34 foreach ($params as $param) echo(escapeshellarg($param)." ");
  35 return;*/
  36
  37 $result=rrd_graph("$IMGFILE", $params);
  38 if ($result === FALSE) {
  39         echo("Error in rrd_graph:<br>");
  40         echo(rrd_error());
  41         die();
  42 }
  43 header("Content-Type: image/svg+xml");
  44 header("Cache-Control: no-cache, max-age=0, must-revalidate");
  45 header("Refresh: ".(60*(60*$hours)+$minutes)/IMGWIDTH);
  46 readfile($IMGFILE);
  47 ?>