Listening (perhaps) to TCP Connection

#1

Hi everyone,

I am nearing completion of TRPL (Currently on chapter 20). I understood the first section well, and proceeded to recreate the example:

use std::net::TcpListener;

fn main() {
    let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
    println!("{:?}", listener);

    for stream in listener.incoming() {
        match stream {
            Ok(stream) => {
                println!("new client");
            }
            Err(e) => {
                println!("connection failed");
            }
        }
    }
}

I believe I am connecting to the server, because my program continues to run. However, nothing is printed to the terminal! :confused:

Output:

    Finished dev [unoptimized + debuginfo] target(s) in 1.42s
     Running `target/debug/hello`
TcpListener { addr: V4(127.0.0.1:7878), fd: 3 }

I have had trouble finding a solution in the documentation. Does anyone know why new client is not printing to the terminal?

Thanks,
Connor

#2

How are you connecting to this server?

#3

Yes, what do you mean by that?

The code you have presented is the server.

You will need to connect to it with a client to see anything happen.

Try running that code and then connecting to it with netcat or telnet.

Or connect to it with a client you write in Rust of course!

1 Like
#4

Sorry, I did not previously understand that I needed to run the client in my browser. :man_facepalming:

#5

But you don't need a browser to run that example client code.

Just run them from the command line. Server in one console window, client in another.

Actually I don't see how you can run that client in a browser.

#6

netcat 127.0.0.1 7878
Or it might be nc for short.

It might be an interesting project to write a minimal netcat in rust :slight_smile: as well as connect to a server like above it can listen on a port. Two netcats can communicate back and forth if one connects to the other that is listening (I think)