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Diffstat (limited to 'ncp-web/ncp-output.php')
-rw-r--r-- | ncp-web/ncp-output.php | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/ncp-web/ncp-output.php b/ncp-web/ncp-output.php new file mode 100644 index 00000000..750c71c6 --- /dev/null +++ b/ncp-web/ncp-output.php @@ -0,0 +1,93 @@ +<?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 = 0; + while (true) + { + 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 +follow( '/run/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 +?> |