Re: [Config4gnu-developer] Writing non-perl Parsers

[Jason L. <JL...@me...>]

I've given myself some time in the hope that I would come up with a good
answer for how to do a network configuration backend, but unfortunately
haven't come up with anything yet. The problem is that I've only been
thinking in terms of configurating things over the network, and network
configuration doesn't really fit that model well. I mean, if your network
isn't configured, then how are you going to configure it over the network?
:)

Regarding WBEM... yes, I suppose it is enterprise-oriented, but I think
what's good for the enterprise-scale is good for small-scale too. Right now,
I'm responsible for administering a number of Linux/Unix systems, of various
flavors, and so that is why I'm working (when I can) on over-the-network
configuration and managing multiple systems at once. I see WBEM as a good
way to do it.

Jason


See Config4GNU WBEM related information at
http://jason.long.name/config4gnu-wbem/index.html.
There are also some documents in SourceForge's document tracker on
Config4GNU's project page.




>>> cog...@li... 6/2/04 10:07:20 PM >>>

On Wed, 2004-06-02 at 20:25, Jason Long wrote:
> Hmmm... where did you find that example? I ask because I vaguely
remember
> seeing that or writing that at one time but I don't remember anymore
where
Downloaded c4g 0.1.8 and it was located under data/parsers/runlevels.xml

> it was. In any case I don't think there's any code that actually uses it.
If
> there is, it probably ignores the type attribute and just ignores perl.
The
> idea is that at some future point the system would handle a multitude of
> different languages.
I didn't understand how yet :(

> 
> At any rate, it's been a while since I've worked on the XML-based stuff
so
> my memory is fuzzy. Lately my parsers have been in the form of WBEM
> providers written in Perl. In this case, the WBEM server is responsible
for
> invoking the parsers, so the parsers can be in any language supported by
the
> WBEM server. The OpenWBEM server (which I use) supports C++ natively,
and
> Perl through an interface layer I wrote.
> 
> My hope is that the WBEM standards (see
> http://www.dmtf.org/standards/wbem/) will eventually become a common way
to
> manage all sorts of computer systems (including GNU/Linux).
What are the advantages of WBEM, it seems to be oriented to enterprise
only. Is it suited to desktop too? At a very superficial glance it
looked like a CORBA kind of interface, am i wrong?

I want to try to develop a network configuration backend, where should i
start? Should extend the perl module bundled with c4g or there is
another way?

> 
> Jason Long
> 
> 
> 
> >>> cog...@li... 5/30/04 8:09:19 AM >>>
> Hello all,
> I've come across this nifty project just yesterday, and it is exactly
> what i thought linux was missing. Congratulations for this very
> interesting initiative.
> 
> My interest in this projects come in two ways: i want to learn how to
> create a non-perl based parser. And then i want to play with Gtk+C or
> pygtk with a simple frontend.
> 
> What i figured so far is that for creating a parser you create something
> like:
> <?xml version="1.0"?>
>  
> <parser uid="runlevels" type="normal">
>  <name>Runlevels</name>
>  
>  <readcommand type="perl"><![CDATA[
>     use CFGXML::Runlevels;
>     my $parser = CFGXML::Runlevels->new;
>     my $doc = $parser->get;
>     my $xml_pi = $doc->createXMLDecl('1.0');
>     print $xml_pi->toString;
>     print $doc->toString;
>  ]]></readcommand>
>  
>   <writecommand type="perl"><![CDATA[
>         use CFGXML::Parser::Ini;
>         my $parser = CFGXML::Parser::Ini->new;
>         $parser->run("unparse");
>   ]]></writecommand>
>  
>   <default-configfile>/etc/samba/smb.conf</default-configfile>
> </parser>
> 
> This seems very clear to me on how it works. But if i want to implement
> the parser in another language/method then perl, how do i do it?
> Which is the type attribute?
> What if it does not a configuration file, is it enforced to use that
> tag?
> How does the parser speak with the middle layer?
> Do you prefer people to write parsers in perl?
> 
> Thank you for your time :)
> 
> Tiago Cogumbreiro
> 
> 
> 
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