html/graph.php

   1 <?php
   2
   3 require("config.php");
   4
   5 $IMGFILE="/tmp/power.svg";
   6
   7 $days = array_key_exists('d', $_REQUEST) ? (int)$_REQUEST['d'] : 0;
   8 $hours = array_key_exists('h', $_REQUEST) ? (int)$_REQUEST['h'] : 0;
   9 $minutes = array_key_exists('m', $_REQUEST) ? (int)$_REQUEST['m'] : 0;
  10 if (!$days && !$hours && !$minutes)
  11         $hours = 1;
  12 $step = array_key_exists('step', $_REQUEST) ? (int)$_REQUEST['step'] : 0;
  13 $params = [
  14         "--daemon", RRDSOCK,
  15         "--imgformat", "SVG",
  16         "-s", "now-".$days."d".$hours."h".$minutes."m",
  17         "--width", "".IMGWIDTH,
  18         "--height", "".IMGHEIGHT,
  19         "--vertical-label", "watts",
  20         "--lower-limit", "0",
  21         "DEF:watts=".RRDFILE.":watts:AVERAGE",
  22         #"DEF:maxwatts=".RRDFILE.":watts:MAX:step=".(60*(60*$hours)+$minutes),
  23         #"DEF:maxwatts=".RRDFILE.":watts:MAX",
  24         "CDEF:wh_raw=watts,".(float)($hours+$minutes/60.).",*",
  25         "VDEF:watts_avg=watts,AVERAGE",
  26         "VDEF:wh=wh_raw,AVERAGE",
  27         "AREA:watts#FF0000",
  28         "LINE:watts_avg#00FF00",
  29         "GPRINT:watts_avg:Average %6.2lf %swatts",
  30         "GPRINT:wh:Total %6.2lf %swh",
  31         #"LINE:maxwatts#0000FF",
  32         #"GPRINT:maxwatts:Max %6.2lf %sW",
  33 ];
  34 if ($step) {
  35         $params[] = '--step';
  36         $params[] = "$step";
  37 }
  38
  39 /*header("Content-Type: text/plain");
  40 foreach ($params as $param) echo(escapeshellarg($param)." ");
  41 return;*/
  42
  43 $result=rrd_graph("$IMGFILE", $params);
  44 if ($result === FALSE) {
  45         echo("Error in rrd_graph:<br>");
  46         echo(rrd_error());
  47         die();
  48 }
  49 header("Content-Type: image/svg+xml");
  50 header("Cache-Control: no-cache, max-age=0, must-revalidate");
  51 header("Refresh: ".(60*(60*(24*$days+$hours))+$minutes)/IMGWIDTH);
  52 readfile($IMGFILE);
  53 ?>