[rrd-developers] Patch to get more metadata out of 'rrdtool graph'
happy at usg.edu
Mon Sep 24 21:24:13 CEST 2007
Tobias Oetiker <tobi at oetiker.ch> writes:
> Hi Mark,
> I will be glad to accept such a patch ... BUT ... it has to be done
> rrd_graph may not print anyting directly. it must return its
> information to the caller who is then responsible for dealing with
> it ... look how this is done currently for the size of the graph
> and the return data for PRINT: ... unfortunately this code does not
> realy lend it self to extension, so I guess what would have to be
> done, is to add an option to rrdtool which enables a different kind
> of return values ... (this is necessary to NOT break existing
> have a look at rrd_info.c to see what kind of interface for
> returning arbitrary data I would like to see ...
> in that way rrdtool could retorn a ton of data about the graph and
> all its properties to the caller ...
Sorry for the delay.
If I understand you correctly this plan is OK; is it?
- Add a command-line option to 'rrdtool graph' which turns on the
display of graph metadata. Add a similar argument to the rrd_graph C
- Create graph_push() (or (ab)use info_push()) and use it inside of
rrd_graph() to collect information about the graph.
- Modify the calls to rrd_graph to respect the command-line argument and
print the data rrd_graph returns.
- And add a command-line option to 'rrdtool graph' which allows you to
specify the scale (just like '-2' does in my original patch).
> Yesterday Mark Plaksin wrote:
>> Here's a small patch against the 1.3 trunk which makes life easier for
>> my buddy's Google Maps-like web interface to RRDs. It's Google
>> Maps-like in that you can drag the graph part of the image left and
>> right in time. Demo site & code coming soon.
>> The patch adds three options to the 'rrdtool graph' command-line:
>> a) '-1' makes rrdtool display the scale (im->minval,im->maxval) of the
>> graph. This is used by the next option. Sample output:
>> scale: 0.00,99.00
>> b) '-2 MIN,MAX' forces the scale to MIN and MAX. To force the scale to
>> be what was returned in the example above you would use:
>> rrdtool graph -2 0.00,99.00
>> c) '-3' Display the coordinates of the upper-left corner of the graph
>> part of the image and the length and height of the graph (in pixels).
>> Sample output:
>> graph_coords: 57,30,400,100
>> Obviously argument names are random :)
>> Would you add this or something like it? It might be helpful to be able
>> to get arbitrary properties of the graph and/or image out via the
>> command-line but these three options are doing the trick for us at the
>> Thanks & thanks for RRDtool!
>> PS: I have a patch against 1.2 also; let me know if you like that too/instead.
> Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten
> http://it.oetiker.ch tobi at oetiker.ch ++41 62 213 9902
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