[syslog-ng] syslog-ng for filtering and execute external application

[Thomas Schmiedl]

Hello,

thanks Péter for your reply. Please could you write the filters

1. for the start (2 lines with a variable 'pid' number):
run child, pid = 1715
using handler 'hls' for '... URL ...'

2. for the stop:
exit child, pid = 1715

Thanks,
Thomas

Am 24.04.2019 um 15:05 schrieb Péter, Kókai:
> Hello,
>
> 'I have the question, if I could use syslog-ng to filter the start and stop
> of the stream'
> Yes, it can filter those messages (disclaimer without seeing those
> messages).
>
> 'and execute an action "ffmpeg stop" and "delete video segments".'
> It was not something syslog-ng is designed to, but for example you could
> use program destination to execute arbitrary executable (like s small
> script to call ffmpeg stop).
>
> You could do something like this (not tested) to have separate things to do
> based on start/stop:
>
> @version: 3.20
> source xupnpd2 {
>    stdin(flags(no-parse));
> };
>
> destination start {
>    program("/usr/bin/do-start-magic.sh");
> };
>
> destination stop {
>    program("/usr/bin/do-stop-magic.sh");
> };
>
> log { source(xupnpd2); filter { program("xupnpd2") AND message("start"); };
> destination(start); };
> log { source(xupnpd2); filter { program("xupnpd2") AND message("stop"); } ;
> destination(stop); };
>
>
> Each log/event is a single new line to the program stdin, which it should
> process.
>
> --
> Kokan
>
>
>
> On Wed, Apr 24, 2019 at 2:36 PM Thomas Schmiedl <thomas.schmiedl at web.de>
> wrote:
>
>> Hello,
>>
>> I use the mediaserver xupnpd2 (https://github.com/clark15b/xupnpd2) on
>> the router to show HLS streams on the TV. Unfortunately, the software is
>> no longer maintained by the original developer (I'm not a developer
>> myself). The HLS processing would have to be revised.
>>
>> My idea is to start a ffmpeg and a local web server on the router, if I
>> want to display the stream (the script xupnpd.lua will be executed,
>> which starts ffmpeg etc.). Unfortunately there is not such a script when
>> terminating the stream (exit ffmpeg etc.).
>>
>> xupnpd2 uses a log where you can track the start as well as the ending
>> of the stream. Since the router has only a small amount of internal
>> memory to write and analyze a logfile, I have the question, if I could
>> use syslog-ng to filter the start and stop of the stream and execute an
>> action "ffmpeg stop" and "delete video segments". I have very little
>> Linux knowledge, maybe you can help me.
>>
>> Here is the excerpt from the xupnpd2 log (Loglevel 8).
>>
>> When starting the stream:
>> run child, pid = 1715
>> using handler 'hls' for '... URL ...'
>>
>> When stopping the stream:
>> exit child, pid = 1715
>>
>> Best regards,
>> Thomas Schmiedl
>>
>> ______________________________________________________________________________
>> Member info: https://lists.balabit.hu/mailman/listinfo/syslog-ng
>> Documentation:
>> http://www.balabit.com/support/documentation/?product=syslog-ng
>> FAQ: http://www.balabit.com/wiki/syslog-ng-faq
>>
>>
>
>
> ______________________________________________________________________________
> Member info: https://lists.balabit.hu/mailman/listinfo/syslog-ng
> Documentation: http://www.balabit.com/support/documentation/?product=syslog-ng
> FAQ: http://www.balabit.com/wiki/syslog-ng-faq
>