common/emgauwa-controller/src/main.rs

use std::str;

use futures::{future, pin_mut, StreamExt};
use futures::channel::mpsc;
use tokio::io::{AsyncReadExt, AsyncWriteExt};
use tokio_tungstenite::{connect_async, tungstenite::protocol::Message};

mod settings;

#[tokio::main]
async fn main() {
	let settings = settings::init();

	let url = format!(
		"ws://{}:{}/api/v1/ws/controllers",
		settings.core.host,
		settings.core.port
	);

	let (stdin_tx, stdin_rx) = mpsc::unbounded();
	tokio::spawn(read_stdin(stdin_tx));

	let (ws_stream, _) = connect_async(url).await.expect("Failed to connect");
	println!("WebSocket handshake has been successfully completed");

	let (write, read) = ws_stream.split();

	let stdin_to_ws = stdin_rx.map(Ok).forward(write);
	let ws_to_stdout = {
		read.for_each(|message| async {
			let data = message.unwrap().into_text().unwrap();
			println!("{}", data);
		})
	};

	pin_mut!(stdin_to_ws, ws_to_stdout);
	future::select(stdin_to_ws, ws_to_stdout).await;
}

// Our helper method which will read data from stdin and send it along the
// sender provided.
async fn read_stdin(tx: mpsc::UnboundedSender<Message>) {
	let mut stdin = tokio::io::stdin();
	loop {
		let mut buf = vec![0; 1024];
		let n = match stdin.read(&mut buf).await {
			Err(_) | Ok(0) => break,
			Ok(n) => n,
		};
		buf.truncate(n);
		tx.unbounded_send(Message::text(str::from_utf8(&buf).unwrap())).unwrap();
	}
}