C Nodes | Elixir Language | Page 1

timber gale Sep 16, 2024, 3:47 AM

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I'm messing around with a project that involves a "C" Nodes. I spent several hours trying to get it to connect, but no dice. Finally, before I went to bed, I tried connecting via the port number with erl_call and the toy echo program worked. Huzzah! But now the question remains: Why wouldn't Erlang/Elixir want to connect to the "C" Node, but erl_call would via address? (The program is actually Rust using C bindings, but that shouldn't change anything. I can post the source if desired)

fiery depot Sep 16, 2024, 6:31 AM

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Could you show us some code? Also - this is called "C Nodes" not "C Hosts". Have you tried working through documentation?

timber gale Sep 16, 2024, 1:17 PM

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Whoopsies, misremembered the name. I did try working through the documentation, and the Rust code is pretty 1:1.

pub fn main() {
    init().unwrap();
    let mut me = Node::init(c"ket@toolbox", Some(c"uwuowoawa")).unwrap();
    println!("Initialized");
    let socket = TcpListener::bind("0.0.0.0:0").unwrap();
    let port = socket.local_addr().unwrap().port();
    let socket_fd = socket.as_raw_fd();

    me.publish(port).unwrap();

    println!("Preparing to accept");
    let conn = me.accept(&mut ListeningPort { inner: socket_fd }).unwrap(); 
    let mut buffer = Buffer::new().unwrap();
    if let Ok(Some(msg)) = conn.receive(&mut buffer) {
         match msg {
                    Message::RegSend { from } => {
                        conn.send(&from, &buffer).unwrap();
                    }
                    _ => {}
                }
            }
        }
    }
}

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C Nodes

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Most of the code came from here
https://www.erlang.org/docs/26/apps/erl_interface/ei_users_guide

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I can see it registering in the EMPD with -debug mode, and, to further complicate the matter, it works when connecting via the port with erl_call

#C Nodes