html/currentjson_chunked.php

   1 <?php
   2 /*
   3  * Experimental version that return chunked http response.
   4  *
   5  * Pulling the values is no longer needed as the one request will output
   6  * the updates every second.
   7  */
   8 require_once('config.php');
   9 require_once("ampy.inc.php");
  10
  11 $speed=@(int)$_GET['speed'];
  12 if ($speed <= 0)
  13         $speed=1;  // seconds
  14
  15
  16 header("Content-Type: text/json");
  17 header("Transfer-Encoding: chunked");
  18 flush();
  19
  20
  21 // Send chunk to browser
  22 function send_chunk($chunk)
  23 {
  24         // The chunk must fill the output buffer or php won't send it
  25         $chunk = str_pad($chunk, 4096);
  26
  27         printf("%x\r\n%s\r\n", strlen($chunk), $chunk);
  28         flush();
  29 }
  30
  31 while (True) {
  32         ampy_flush_rrd_daemon();
  33
  34         $info=rrd_lastupdate(RRDFILE);
  35         if ($info === FALSE)
  36                 $result=[
  37                         'last_update' => 'unknown',
  38                         'watts' => 'unknown',
  39                         'error' => rrd_error(),
  40                 ];
  41         else
  42                 $result=[
  43                         'last_update' => $info['last_update'],
  44                         'watts' => (float)$info['data'][0],
  45                 ];
  46         $result['counter'] = ampy_get_counter();
  47         send_chunk(json_encode($result));
  48         sleep($speed);
  49 }
  50 ?>