Fantastic, that is exactly what I was looking for. Thank you very much for helping me.
On Mon, Jan 26, 2009 at 1:46 AM, Tim Allen <screwt...@froup.com> wrote: > On Mon, Jan 26, 2009 at 01:06:37AM -0500, Adan Broderick wrote: > > I'm trying to write a program that will call my own function whenever a > > query to a nameserver times out. I have figured out how to run the DNS > > server. And I also know how to use filterAnswers(). But how do I catch > the > > "Failure: twisted.names.error.DNSQueryTimeoutError:" messages by adding > code > > to the resolver I've constructed? > > I'm not familiar with twisted.names, but looking at the source to > client.Resolver, it seems that something winds up calling _lookup() with > a timeout, which passes it off to the queryUDP() and sets up the basic > result handling. If queryUDP() returns a result, it goes to filterAnswers, > which checks for truncation and re-sends with queryTCP(). > > Since the actual deferreds that deal with the timeouts are returned from > queryUDP() and queryTCP(), it looks like you should be overriding those > methods and capturing the results instead. Something like this: > > class MyResolver(client.Resolver): > > def _handle_query_timeout(self, fail): > fail.trap(DNSQueryTimeoutError) > print "Got an error:", fail.getErrorMessage() > > def queryUDP(self, *args, **kwargs): > d = client.Resolver.queryUDP(self, *args, **kwargs) > d.addErrback(self._handle_query_timeout) > return d > > def queryTCP(self, *args, **kwargs): > d = client.Resolver.queryTCP(self, *args, **kwargs) > d.addErrback(self._handle_query_timeout) > return d > > _______________________________________________ > Twisted-Python mailing list > Twisted-Python@twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python >
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