Need cancel() on async_resolve() to callback the resolve handler immediately

From: sandeep m.v (venkata.sandeep.m_at_[hidden])
Date: 2021-08-23 14:24:27

Hi All,

I'm looking for a solution for below problem.
We're using async_resolve() to perform DNS resolution using
boost::asio::ip::tcp::resolver.
In few instances probably during network connectivity issues, async_resolve
is taking more time.
When our application timeouts in 15seconds while waiting for DNS
resolution, cancel() is called on resolver. But, that doesn't callback to
resolve handle immediately.
When I tried to search for this, it looks like, when a cancel() is called
on resolver, that doesn't cancel ongoing actual resolution but may cancel
if there are any other pending asynchronous action.
It's taking 40seconds at times to call resolve handler even when failed to
resolve host and even after calling cancel on it.
My application waits until resolve handler is called after cancel() to
proceed further processing.
Is it possible to stop that async_resolve() and get callback to resolve
handle immediately after cancel()?
If that's impossible, is there a way that we can stop that doesn't callback
resolve handler later? Is it possible to close underlying socket related to
async_resolve from my application?
Thank you in advance.

Regards,
Sandeep