Make it easier to inspect a rustls_str

[kevinburke]

I'm writing a test in Rust that is trying to check a rustls_str, and it's trickier because it's difficult to print the contents of the str to the console.

It might be nice to implement one of

• [derive(Debug)] for that struct

• a method to convert a rustls_str back into a Rust str
• std::fmt::Display for that struct.

Open to any of these that you think would be best.

[jsha]

Let's give it a #[derive(Debug)]

[kevinburke]

Hmmm... if we add that, I get

rustls_str { data: 0x1027f29b4, len: 4, phantom: PhantomData }

when I try to print using debug formatting:

    #[test]
    fn test_rustls_str_debug() {
        let s = "abcd";
        let rs: rustls_str = s.try_into().unwrap();
        let mut buf = String::new();
        write!(buf, "{:?}", rs);
        println!("{}", buf);
        assert_eq!(3, 4)
    }

So we get some more data, but the contents of the string - what I'm trying to print - I still get out a pointer, which is not great.

[jsha]

Ah, right, sorry - a derived Debug won't work here, you need to implement an actual Debug implementation, which turns the pointer and len into an &str.