improve actorless echo example

websockets/chat-actorless/Cargo.toml

@@ -11,7 +11,7 @@ awc = "3"
 
 derive_more = "0.99.5"
 env_logger = "0.9"
-futures-util = { version = "0.3.7", default-features = false, features = ["std", "sink"] }
+futures-util = { version = "0.3.17", default-features = false, features = ["std", "sink"] }
 log = "0.4"
 rand = "0.8"
-tokio = { version = "1.13.1", features = ["full"] }
+tokio = { version = "1.13.1", features = ["rt", "macros", "sync", "time"] }

websockets/chat-actorless/src/main.rs

@@ -42,7 +42,8 @@ async fn chat_ws(
     Ok(res)
 }
 
-#[actix_web::main]
+// note that the `actix` based WebSocket handling would NOT work under `tokio::main`
+#[tokio::main(flavor = "current_thread")]
 async fn main() -> std::io::Result<()> {
     env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
 

websockets/chat-actorless/src/server.rs

@@ -9,7 +9,7 @@ use std::{
 };
 
 use rand::{thread_rng, Rng as _};
-use tokio::sync::{mpsc, oneshot};
+use tokio::sync::mpsc;
 
 use crate::{Command, ConnId, Msg, RoomId};