[rrd-users] display graphs generated with python bindings in html

[Clemens Weninger]

On Tuesday 15 December 2009 00:55:26 Michael P. Soulier wrote:
> On 15/12/09 Jean-Yves Avenard said:
> > You should have a look at the pylons framework ; which let you do
> > stuff like that quite easily.
> >
> > Otherwise, you can't modify html headers directly, as least not as
> > easily as with PHP
> 
> If this is Django then I must disagree. Modifying the headers is trivial.
> 
> I would not rely on rrdtool to send http headers, capture the output of
> rrdtool in a buffer in memory, and then customize your response object in
> Django.
> 
> ie.
> 
>     response = HttpResponse(mimetype="image/jpg")
>     response.write(buffer)
>     return response
> 
> Not really an rrdtool question though.
> 
> Mike
> 

Hi,
ok thanks for that tip, I can easily modify the headers now. But a problem 
that remains is how to get the image in the buffer?
I would like to call:

#!/usr/bin/python
import rrdtool 

 rrdtool.graph('-', <further options>)  # that should go into buffer

response = HttpResponse(mimetype="image/jpg")
response.write(buffer)
return response

but that goes directly to stdout. I tried to redirect stdout to a buffer but I 
couldn't get it to work.

Clemens