html/currentjson_chunked.php

   1 <?php
   2 $RRDFILE="/home/nirgal/ampy/power.rrd";
   3
   4 header("Content-Type: text/json");
   5 header("Transfer-Encoding: chunked");
   6 flush();
   7
   8
   9 // Send chunk to browser
  10 function send_chunk($chunk)
  11 {
  12         // The chunk must fill the output buffer or php won't send it
  13         $chunk = str_pad($chunk, 4096);
  14
  15         printf("%x\r\n%s\r\n", strlen($chunk), $chunk);
  16         flush();
  17 }
  18
  19 while (True) {
  20         $info=rrd_lastupdate($RRDFILE);
  21         if ($info === FALSE)
  22                 $result=[
  23                         'last_update' => 'unknown',
  24                         'watts' => 'unknown'
  25                 ];
  26         else
  27                 $result=[
  28                         'last_update' => $info['last_update'],
  29                         'watts' => $info['data'][0]
  30                 ];
  31         send_chunk(json_encode($result));
  32         sleep(10);
  33 }
  34 ?>