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