[net-dns-users] AXFR (was: Re: sep() and is_sep())

Calle Dybedahl calle at init.se
Tue Jun 3 14:18:02 UTC 2014

On 3 jun 2014, at 15:46, Dick Franks <rwfranks at acm.org> wrote:

> Internal method (and it *is* very obviously that) should never have had POD documentation in the first place.

I disagree. It was certainly not obvious to me. There was example code on how to use it, and it filled a need that the axfr() method does not. 

> Are you arguing for a per-RR call-back as an optional argument to axfr()?

Just mentioning that the current way is not the only possible way. What I wish right now is that the same dedication to backwards compatibility that is shown towards supporting ancient versions of Perl would be shown towards the API of Net::DNS itself.

> That way, you get your iteration done for free, we get the mechanics we need for TSIG.
>    $resolver->axfr(  'example.com', 'IN', sub { my $rr = shift;  ...  }  );

I put the class argument last, so I only have to spell it out in the very rare cases where it’s not IN. Other than that minor detail, that’s it exactly.

> Q:  Does the call-back function return anything?  If so what do we do with it?

Since one of the things we want to be able to do is to terminate a transfer before it’s complete (which can also not be done with the axfr() in Net::DNS::Resolver), I made that contingent on the return value from the callback. As long as it returns a true value, the process will continue (until it finishes naturally). If it returns false, the transfer will be stopped.

Calle Dybedahl
calle at init.se -*- +46 703 - 970 612

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