[collectd] data_set_t over the protocol

[Doug MacEachern]

Hi Florian,

Sounds great, I'd be very interested to take a look if you don't mind  
pushing to a remote branch.  Thanks!

On Apr 4, 2009, at 3:57 AM, Florian Forster wrote:

> Hi Doug,
>
> On Fri, Apr 03, 2009 at 01:25:53PM -0400, Doug MacEachern wrote:
>> I see there has been some discussion on the subject:
>> http://marc.info/?l=collectd&m=122371735702092
>> Interested if there are any new ideas around this esp. with the  
>> recent
>> edition of the gmond plugin.
>
> I started writing a `netcmd' plugin, basically an extension of the
> unixsock plugin to TCP sockets (in addition to the UNIX domain  
> sockets).
> My goals were to make is possible to send the `FLUSH' command via
> network and to implement SSL / certificate authentication eventually.
>
> One of the central problems when transferring the `data set' over the
> network is that you either end up transferring it over and over again,
> although the server already knows about the type, or you need
> bidirectional communication. The latter is, of course, trivial with a
> TCP based communication schema. Since each connection is handled by a
> separate thread makes this pretty straight forward to implement:
>
> -- 8< -- communication --
> -> | PUTVAL myhost/someplugin/unknown_type ...
> <- | -1 Unknown type: unknown_type
> -> | DEFINEDS unknown_type ...
> <- | 0 Success
> -> | PUTVAL myhost/someplugin/unknown_type ...
> <- | 0 Success
> -- >8 --
>
> The server side could do:
> -- 8< -- code --
> handle_putval (type, ...)
> {
>   ds = check_local_tree (type);
>   if (ds == NULL)
>     ds = plugin_get_ds (type);
>   if (ds == NULL)
>     send_error ("Unknown type: %s", type);
>   else
>   {
>     plugin_dispatch_values_with_ds (ds, ...);
>     send_success ();
>   }
> }
> -- >8 --
>
> Since that `netcmd' code isn't done, I don't want to pull it into
> `master' yet. But if you're interested in starting from there I can of
> course push that into some other branch on git.verplant.org..
>
> Regards,
> -octo
> -- 
> Florian octo Forster
> Hacker in training
> GnuPG: 0x91523C3D
> http://verplant.org/