[rrd-developers] [PATCH] rrd_open and rrdcached

[Daniel.Pocock at barclayscapital.com]

rrdcached makes some calls to access and stat, which don't work for my
virtual filesystem abstraction.

This patch:

- provides implementations of rrd_stat and rrd_access, invoking the C
library methods by default
- modify rrdcached to use the rrd_open API for these methods
- update Makefile.am so that rrdcached links with the rrd_open API

I'm not sure whether rrdcached is meant to link with rrd_open.  The
alternative: update the rrdtool C API to include some higher level
functions that can be called from rrdcached and other RRD-based apps.
This may even mean that some of the logic from rrdcached has to be moved
into such functions.

I'm also coming up against similar issues with Ganglia - gmetad wants to
know if the RRD files already exist on disk, even though they only exist
in my virtual back-end.  To deal with that, I'm thinking of adding some
methods to the RRD API so that applications can do things like browsing
the directory of RRDs.

Regards,

Daniel
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