[collectd] Plain text protocol question

XANi xani666 at gmail.com
Fri Oct 9 00:33:54 CEST 2009

On Thu, 08 Oct 2009 12:00:13 +0200, Jean Baptiste FAVRE
<collectd at jbfavre.org> wrote:
> Heelo,
> I'm new on the list, but already using collectd since a few months.
> In order to be able to improve data display, I'm trying to stream them
> to a web page. I plan to use either lightstreamer
> (http://www.lightstreamer.com/) or ape-project
> (http://www.ape-project.org/)
> But the first step is to be able to get values. Therefore, I activated
> Unix Socket plugin and try to get data.
> I'm now able to use LISTVAL (despite some strange display effects,
> mostly due to my client code I think), but facing issues with GETVAL.
> If possible, I would rather prefer using sort of wildcard, for
> example: GETVAL hostname/*
> Is there any way to achieve it, or will I have to parse each line of
> LISTVAL to get it working ?
Atm you would have to do LISTVAL then GETVAL. Also (afaik) atm. there
is no way to get info about updates so you have to do LISTVAL every x
seconds to check which values got updated and then do GETVAL (because
GETVAL doesn't return timestamp of last update)

Atm im writing simple daemon to "publish" data from rrd and unixsocks
(and probably other sources like DBs) as JSON/XML (lot of ppl seem to
be interested about some way of getting data out of collectd thru JSON)
and I had similar problems, basically:
1. No way to "subscribe" for data  like "plz if data from path matching
host/interface/if_octets.*" change then send it to me"
2. GETVAL dont have last update in output so u have to do LISTVAL
anyway if u wanna know if data is stall or fresh

Mariusz Gronczewski

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