core/emgauwa-controller/src/main.rs

use std::str;

use futures::{future, pin_mut, SinkExt, StreamExt};
use futures::channel::mpsc;
use sqlx::pool::PoolConnection;
use sqlx::Sqlite;
use tokio::io::AsyncReadExt;
use tokio_tungstenite::{connect_async, tungstenite::protocol::Message};
use tokio_tungstenite::tungstenite::Error;
use emgauwa_lib::db;
use emgauwa_lib::db::Controller;
use emgauwa_lib::db::types::ControllerUid;
use crate::relay_loop::run_relay_loop;
use crate::settings::Settings;

mod settings;
mod driver;
mod relay_loop;

fn create_this_controller(conn: &mut PoolConnection<Sqlite>, settings: &Settings) -> Controller {
	futures::executor::block_on(async {
		Controller::create(
			conn,
			&ControllerUid::new(),
			&settings.name,
			i64::try_from(settings.relays.len()).expect("Too many relays"),
			true
		).await.expect("Failed to create controller")
	})
}

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

	let pool = db::init(&settings.database).await;

	let mut conn = pool.acquire().await.unwrap();

	let this = Controller::get_all(&mut conn)
		.await
		.expect("Failed to get controller from database")
		.pop()
		.unwrap_or_else(|| create_this_controller(&mut conn, &settings));

	let this_json = serde_json::to_string(&this).unwrap();

	println!("{:?}", settings.relays);
	println!("{:?}", this);
	println!("{}", this_json);

	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");

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

	write.send(Message::text(this_json)).await.unwrap();
	let ws_to_stdout = read.for_each(handle_message);
	let stdin_to_ws = stdin_rx.map(Ok).forward(write);

	tokio::spawn(run_relay_loop(settings));

	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();
	}
}

pub async fn handle_message(message_result: Result<Message, Error>) {
	match message_result {
		Ok(message) => println!("{}", message.into_text().unwrap()),
		Err(err) => println!("Error: {}", err)
	}
}