The protocol is now based around a message-oriented scheme intended
to use futures_codec, which in turn uses BytesMut. The transition
to BytesMut is incomplete, and we're not nearly so zero-copy as
intended. We should think about that.
Arti is a rust tor implementation. It's project I've been working
on for a few months now, in weekends and in spare time. It doesn't
speak the tor protocol yet, and it doesn't connect to the network at
all.
It needs much more documentation and testing, but I'm just about
ready to show it to others. See the README.md for a description of
what is there and what isn't.
Nick Mathewson