[ldns-users] python wrapper for ldns_rr_new_frm_fp_l

Willem Toorop willem at NLnetLabs.nl
Tue May 17 20:58:12 UTC 2011

Hi Bedrich,

I love the generator function. Looks like the pytonicly correct way to
access ldns_rr_new_frm_fp_l from python to me! The patch is applied in
trunk, and the demo scripts added to the example directory.

Thanks again! Willem

Op 05-05-11 10:33, Bedrich Kosata schreef:
> Hi everybody,
> after working with the python wrapper around ldns_rr_new_frm_fp_l, I
> would like to propose a few changes.
> The C version of the ldns_rr_new_frm_fp_l function stores the state of
> zone file parsing in 3 different variables - origin, prev(ious owner)
> and (default) ttl. Due to pointer and pointer to pointer usage, these
> are automatically updated by calls to ldns_rr_new_frm_fp_l and the
> only thing the programmer has to take care of it not to touch these.
> However, in Python this is not possible and the wrapper goes around
> this problem by returning the new values of origin, prev and ttl as
> part of the result of the function. It is then left to the programmer
> to send these updated values back to the subsequent calls of
> ldns.ldns_rr_new_frm_fp_l_. I attach a script that shows how to do
> this and I would suggest putting it into the examples directory as
> reference.
> I also added a convenience function (a generator) into the python
> interface, so that the context is managed automatically and the
> programmer does not have to take care of it. It is part of the patch I
> attach. There is also a demo script for this function attached.
> Another change that I made in the patch is that I removed the 5th
> argument, which indicated whether the result should contain line
> number. As the value of this argument influenced the number and order
> of items in the returned tuple, which I do not consider a good design,
> I removed it and changed the result, so that it always contains the
> number of lines parsed in this step and the format of the result is
> always the same.
> Please let me know if these changes are acceptable or if there is
> something else needed.
> With best regards
> Beda
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> ldns-users at open.nlnetlabs.nl
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