Switch to async-std, refractor notifications code.

src/notifications/websocket.rs

@@ -0,0 +1,28 @@
+use crate::util::variables::WS_HOST;
+
+use log::info;
+use async_std::task;
+use futures::prelude::*;
+use async_std::net::{TcpListener, TcpStream};
+
+pub async fn launch_server() {
+    let try_socket = TcpListener::bind(WS_HOST.to_string()).await;
+    let listener = try_socket.expect("Failed to bind");
+    info!("Listening on: {}", *WS_HOST);
+
+    while let Ok((stream, _)) = listener.accept().await {
+        task::spawn(accept(stream));
+    }
+}
+
+async fn accept(stream: TcpStream) {
+    let addr = stream.peer_addr().expect("Connected streams should have a peer address.");
+    let ws_stream = async_tungstenite::accept_async(stream)
+        .await
+        .expect("Error during websocket handshake.");
+
+    info!("User established WebSocket connection from {}.", addr);
+
+    let (write, read) = ws_stream.split();
+    read.forward(write).await.expect("Failed to forward message")
+}