Your opinions pretty much mimic mine.
1) Don't write a DNS library. It's been done many times before by
others, so just use those.
2) Don't jostle things where it is unnecessary.
As far as implementation details, it's far too early to be criticizing
those, so I just barely skimmed to make sure they made some amount of
sense. I imagine as things get more nitty-gritty, you'll come up with a
more detailed plan with structures, API calls, etc.
With regards to the two third-party libraries you presented, my initial
impression is that I like c-ares better. Honestly, I find the on-site
documentation for both libraries to be pretty bad, but c-ares is the
better of the two. I also like that c-ares has functions for parsing
different DNS record types. I also like that c-ares is hosted on github.
Other things that would influence me on this decision:
1) Size: I'd prefer something small to something large, especially if
the "something large" is a lot of unnecessary utilities that we aren't
going to use.
2) Activity: I would prefer using a library where, if we wanted to make
a contribution, we would have some assurance that the change would
actually be seen by someone and actually merged in.
3) Threading Model: This doesn't is not documented clearly on either the
c-ares or libunbound sites.
On 02/09/2015 11:19 AM, Joshua Colp wrote:
Greetings All,
One topic that came up at AstriDevCon this year (my my, how time has
flown by) was DNS support[1]. This included both that provided by
PJSIP and DNS support in Asterisk in general. I've created a wiki
page[2] which covers a bit of how DNS in Asterisk has evolved,
shortcomings core usage has as well as PJSIP, how modules use DNS, and
potential ways to improve things going forward. While I've proposed
the solution I think strikes the best balance between concerns I'd
like to hear more thoughts and discuss what we think is the best
option for the project going forward. Thoughts?
Cheers,
[1] https://wiki.asterisk.org/wiki/display/AST/AstriDevCon+2014
[2] https://wiki.asterisk.org/wiki/display/~jcolp/DNS+Support+in+Asterisk
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