twistr | Twistd wrapper to restart your Twisted server

There is an evident lapse in my understanding on concurrent development in Rust unfortunately. This question stems from weeks repeated struggles to solve a seemingly "trivial" problem.

Developing a Rust library, named twistrs that is a domain name permutation and enumeration library. The aim and objective of the library, is to be provide a root domain (e.g. google.com) and generate permutations of that domain (e.g. guugle.com) and enrichment that permutation (e.g. it resolves to 123.123.123.123).

One of its objectives, is to perform substantially faster than its Python counterpart. Most notably, network calls such as, but not limited to, DNS lookups.

The idea behind the library (apart from being a learning ground) is to develop a very trivial security library that can be implemented to meet various requirements. You (as a client) can choose to interact directly to the permutation or enrichment modules internally, or use the library provided async/concurrent implementation.

Note that there is no shared state internally. This is probably very inefficient, but somewhat meaningless for the time being as it prevents a lot of issues.

Internally the DNS lookup is done synchronously and blocks by nature. I'm having trouble turning this into concurrent code. The closest I could get was to use tokio mpsc channels, and perform spawn a single tokio task: