Re: Writing non-perl Parsers

On Fri, 2004-06-11 at 12:23, Jason Long wrote:
> 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?
> :)
Yeah, i guess it doesn't ;D I was thinking on a more desktop oriented
point of view, where, like gnome-system-tools, where there's a XML
dialect where local applications speak with the backend configuration
tools. Seemed like this was the case too, but better documented and
mature.

> 
> 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.
> 
> 
> 
> 
> >>> cogumbreiro-bcihRdKnBVXand0/[email protected] 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
> > 
> > 
> > 
> > >>> cogumbreiro-bcihRdKnBVXand0/[email protected] 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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