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<?php
///
// Dispatcher of SSE events with the contents of the NCP log
//
// Copyleft 2017 by Ignacio Nunez Hernanz <nacho _a_t_ ownyourbits _d_o_t_ com>
// GPL licensed (see end of file) * Use at your own risk!
//
// More at https://ownyourbits.com/2017/02/13/nextcloud-ready-raspberry-pi-image/
///
header('Content-Type: text/event-stream; charset=utf-8');
header('Cache-Control: no-cache'); // recommended to prevent caching of event data.
/**
* Constructs the SSE data format and flushes that data to the client.
* ( from html5rocks.com )
*
* @param string $id Timestamp/id of this connection.
* @param string $msg Line of text that should be transmitted.
*/
function sendMsg($id, $msg)
{
echo "id: $id" . PHP_EOL;
echo "data: $msg" . PHP_EOL;
echo PHP_EOL;
ob_flush();
flush();
}
/**
* Pings the client-browser to force detection of closed socket
*/
function pingClient()
{
echo ' ';
ob_flush();
flush();
}
/**
* Imitates 'tail --follow' functionality, and sends lines as SSE events
* , while pinging browser to detect closed tab.
* ( based on stack overflow )
*/
function follow($file)
{
$size = filesize($file);
while (true)
{
if ( !file_exists($file) )
{
usleep(200000); // 0.2s
continue;
}
clearstatcache();
$currentSize = filesize($file);
if ($size == $currentSize)
{
usleep(200000); // 0.2s
// if the user refreshes the tab >5 times, it won't load because it doesn't detect closed socket
// , and all workers are in use
pingClient();
continue;
}
$fh = fopen($file, "r");
fseek($fh, $size);
while ($line = fgets($fh))
sendMsg( 'output' , $line );
fclose($fh);
$size = $currentSize;
}
}
session_write_close();
echo str_pad('',1024*1024*4); // make sure the browser buffer becomes full
touch( '/var/log/ncp.log' );
follow( '/var/log/ncp.log' );
// License
//
// This script is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This script is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this script; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place, Suite 330,
// Boston, MA 02111-1307 USA
?>
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