[Twisted-Python] Async reverse DNS lookup?

[Yun Mao]

Thank you!

Continuing on the topic of DNS lookup, does the default setting call
socket.gethostbyname() when each time I do connectTCP()? I also noticed
that my program is not responsive when DNS operation took a long time to
finish.

I took a short look into the code:  the base.py says that if self.resovler
is None then it will call _internalResolve(), which calls gethostbyname().
If I am right, how to set the default resolver?

Yun


On Mon, 27 Sep 2004 exarkun at divmod.com wrote:

> On Mon, 27 Sep 2004 15:57:33 -0400 (EDT), Yun Mao <maoy at cis.upenn.edu> wrote:
> >I'm currently using socket.gethostbyaddr(ip), and sometimes it will block
> > my program for quite a while. What's the correct way to do this in
> > twisted? Do I have to create a thread for that? Thanks!
> > Yun
> >
>
>   from twisted.names import client
>   from twisted.python import util, log
>   from twisted.internet import reactor
>
>   addr = '198.49.126.190'
>   ptr = '.'.join(addr.split('.')[::-1]) + '.in-addr.arpa'
>   client.lookupPointer(ptr
>       ).addCallback(lambda (ans, auth, add): util.println(ans[0].payload.name)
>       ).addErrback(log.err
>       ).addBoth(lambda r: reactor.stop()
>       )
>   reactor.run()
>
>   Jp
>
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