Split `TlsStream` like `TcpStream`

[jmmaloney4]

Tokio allows splitting a TcpStream into a (Owned)ReadHalf / (Owned)WriteHalf via TcpStream::split / TcpStream::into_split, but I don't believe tokio_rustls allows splitting a TlsStream that wraps a TcpStream. Is there a way to do this with the current API that I'm not thinking of? If not, I'd be interested in helping to implement this feature.

The split method in TcpStream above is not the same as tokio::io::split. It supports true simultaneous reads and writes as opposed to just locking around the syscalls.

[cpu]

I believe the Deno folks have worked on something in this space: https://github.com/denoland/rustls-tokio-stream that might be a useful comparison point.

There's some previous discussion in an issue that was created when the Rustls specific code lived alongside the native-tls code in tokio-rs/tls#40

[quininer]

@cpu tokio-rustls is not affected by tokio-rs/tls#40 .

Any split stream based on rustls must be locked until rustls support full-duplex mode. rustls/rustls#288

[cpu]

@cpu tokio-rustls is not affected by tokio-rs/tls#40 .

Ah! Thanks for clarifying. I had indeed missed that this discussion was centered around native-tls.

[miaomiao1992]

rustls-tokio-stream

rustls-tokio-stream is not really "lockfree tlsstream split". because this crate uses tokio::io::split which is based on std Mutex, the readhalf and writehalf before using should be locked.