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ncp-web: use SSE to display process output in real time. Exit status …
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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, $size); | ||
|
|
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| while ($line = fgets($fh)) | ||
| sendMsg( 'output' , $line ); | ||
|
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| fclose($fh); | ||
| $size = $currentSize; | ||
| } | ||
| } | ||
|
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| session_write_close(); | ||
| echo str_pad('',1024*1024*4); // make sure the browser buffer becomes full | ||
| follow( '/run/ncp.log' ); | ||
|
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||
| // 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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