patch for preprocessing macros

[Ethan Galstad]

Matthias Eble wrote:
> Hi list,
> 
> we moved check_cluster from contrib to the main distribution of the 
> nagios plugins a couple of days ago. While writing the test cases, I 
> remembered that I had had an issue to flexibly configure service 
> clusters months ago, so i wrote a small patch to meet these needs 
> (although i developed a workaround at that time).
> 
> The problem:
> If there are multiple checks for one server process, eg. apache on port 
> 80 and port 443 a corresponding service cluster has to have a command 
> line similar to this one:
> 
>   check_cluster -s \
>   -d $SERVICESTATEID:myhost1:Port 443$,$SERVICESTATEID:myhost1:Port 80$
> 
> Templates cannot be used since myhost1 cannot be substituted by the 
> $HOSTNAME$ macro due to nagios' macro substitution logic resulting in 
> one service config for each host.
> 
> So i wrote a patch that can handle macros in on demand macros.
> 
> I originally thought about syntax like $SERVICESTATEID:$HOSTNAME$:Port$
> but I couldn't imagine a way to distinguish between opening and closing 
> $ signs. So my syntax contains braces and looks like this:
> 
> $SERVICESTATEID:{$HOSTNAME$}:svc_desc$
> 
> The code substitutes macros in curly braces first.
> 
> What do you think about it?
> 
> Thanks
> Matthias
[snip]

Thanks for the patch Matthias.  Its a few months old, but I kept it on 
my TODO list.  I think I'll reimplement the patch as a recursive 
function that allows multiple levels of nesting.  Not sure if multiple 
levels are absolutely necessary, but the functionality will be there if 
someone needs it.


Ethan Galstad,
Nagios Developer
---
Email: nagios at nagios.org
Website: http://www.nagios.org

-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems?  Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >>  http://get.splunk.com/