html/currentjson.php

   1 <?php
   2
   3 require("config.php");
   4
   5 exec("/usr/bin/rrdtool flushcached --daemon ".RRDSOCK." ".RRDFILE);
   6
   7 $fd = fopen(COUNTERFILE, 'r');
   8 $mtime = fstat($fd)['mtime'];
   9 $counter = (double)fread($fd, 128) * 1000;
  10 fclose($fd);
  11 #echo($mtime.'<br>');
  12 #echo('counter='.$counter.'<br>');
  13
  14 $params = [
  15         '--daemon', RRDSOCK,
  16         '-s', $mtime,
  17         'DEF:watts='.RRDFILE.':watts:AVERAGE',
  18         'VDEF:avg=watts,AVERAGE',
  19         #'VDEF:last=watts,LAST',
  20         'PRINT:avg:%lf',
  21         #'PRINT:last:%lf',
  22 ];
  23 /*header("Content-Type: text/plain");
  24 foreach ($params as $param) echo(escapeshellarg($param)." ");
  25 return;*/
  26 $info=rrd_graph( '-', $params);
  27 #print_r($info);
  28 $watts_since_counter = (double)$info['calcpr'][0];
  29 #$watts_last = (double)$info['calcpr'][1];
  30 #echo('watts_since_counter='.$watts_since_counter.'<br>');
  31 #echo('hours_since_counter='.((time() - $mtime) / 3600.).'<br>');
  32 $wh_since_counter = $watts_since_counter * (time() - $mtime) / 3600.;
  33 #echo('wh_since_counter='.$wh_since_counter.'<br>');
  34 $newcounter = $counter + $wh_since_counter;
  35 #echo('newcounter='.$newcounter.' kWh<br>');
  36
  37 $info=rrd_lastupdate(RRDFILE);
  38 if ($info === FALSE)
  39         $result=[
  40                 'last_update' => 'unknown',
  41                 'watts' => 'unknown'
  42         ];
  43 else
  44         $result=[
  45                 'last_update' => $info['last_update'],
  46                 'watts' => (double)$info['data'][0]
  47         ];
  48
  49 #$result=[];
  50 #$result['watts'] = $watts_last;
  51 $result['counter'] = $newcounter / 1000.;
  52
  53 header("Content-Type: text/json");
  54 echo(json_encode($result));
  55 ?>