On Thu, 15 Oct 2020, John Wiseman via curl-library wrote:
I'm trying to avoid flooding the dns resolver when using multi interface. I
know it's on the TODO list, but I think it may be doable from user side with
callbacks.
What exactly do you want to limit? The number of names to resolve within a
certain period a time? Is this a real problem for you or are you just taking
precautions?
For example, a callback to inform the start of lookup which passes in the
name to be resolved. User can return some value in this callback to inform
curl to pause on the beginning of lookup. Another callback to inform the end
of lookup which passes in the name being resolved and the result.
It could proably get done that way, but I think that if we would work on
adding such an elaborate menanism, then couldn't we just as well add the
entire "reduce name resolver speed" thing in libcurl?
Or even: if you would be willing to add code in your application to limit the
name resolve frequency, couldn't you just as well then just hang on a little
before you add transfers using a new host name so that you can keep below the
threshold?
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