Restructure folders (#411)

websockets/tcp-chat/Cargo.toml

@@ -0,0 +1,30 @@
+[package]
+name = "websocket-tcp-example"
+version = "2.0.0"
+authors = ["Nikolay Kim <fafhrd91@gmail.com>"]
+edition = "2018"
+
+[[bin]]
+name = "websocket-tcp-server"
+path = "src/main.rs"
+
+[[bin]]
+name = "websocket-tcp-client"
+path = "src/client.rs"
+
+[dependencies]
+actix = "0.10"
+actix-web = "3"
+actix-web-actors = "3"
+actix-files = "0.3"
+actix-codec = "0.3"
+
+rand = "0.7"
+bytes = "0.5.3"
+byteorder = "1.2"
+futures = "0.3"
+env_logger = "0.8"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+tokio = "0.2.4"
+tokio-util = "0.3"

websockets/tcp-chat/README.md

@@ -0,0 +1,32 @@
+# Websocket chat example
+
+This is extension of the
+[actix chat example](https://github.com/actix/actix/tree/master/examples/chat)
+
+Added features:
+
+* Browser WebSocket client
+* Chat server runs in separate thread
+* Tcp listener runs in separate thread
+
+## Server
+
+Chat server listens for incoming tcp connections. Server can access several types of message:
+
+* `/list` - list all available rooms
+* `/join name` - join room, if room does not exist, create new one
+* `/name name` - set session name
+* `some message` - just string, send message to all peers in same room
+* client has to send heartbeat `Ping` messages, if server does not receive a heartbeat message for 10 seconds connection gets dropped
+
+To start server use command: `cargo run --bin websocket-tcp-server`
+
+## Client
+
+Client connects to server. Reads input from stdin and sends to server.
+
+To run client use command: `cargo run --bin websocket-tcp-client`
+
+## WebSocket Browser Client
+
+Open url: [http://localhost:8080/](http://localhost:8080/)

websockets/tcp-chat/client.py

@@ -0,0 +1,80 @@
+#!/usr/bin/env python3
+"""websocket cmd client for actix/websocket-tcp-chat example."""
+import argparse
+import asyncio
+import signal
+import sys
+
+import aiohttp
+
+queue = asyncio.Queue()
+
+
+async def start_client(url, loop):
+    name = input('Please enter your name: ')
+
+    ws = await aiohttp.ClientSession().ws_connect(url, autoclose=False, autoping=False)
+
+    def stdin_callback():
+        line = sys.stdin.buffer.readline().decode('utf-8')
+        if not line:
+            loop.stop()
+        else:
+            # Queue.put is a coroutine, so you can't call it directly.
+            asyncio.ensure_future(queue.put(ws.send_str(name + ': ' + line)))
+
+    loop.add_reader(sys.stdin, stdin_callback)
+
+    async def dispatch():
+        while True:
+            msg = await ws.receive()
+            if msg.type == aiohttp.WSMsgType.TEXT:
+                print('Text: ', msg.data.strip())
+            elif msg.type == aiohttp.WSMsgType.BINARY:
+                print('Binary: ', msg.data)
+            elif msg.type == aiohttp.WSMsgType.PING:
+                await ws.pong()
+            elif msg.type == aiohttp.WSMsgType.PONG:
+                print('Pong received')
+            else:
+                if msg.type == aiohttp.WSMsgType.CLOSE:
+                    await ws.close()
+                elif msg.type == aiohttp.WSMsgType.ERROR:
+                    print('Error during receive %s' % ws.exception())
+                elif msg.type == aiohttp.WSMsgType.CLOSED:
+                    pass
+                break
+
+    await dispatch()
+
+
+async def tick():
+    while True:
+        await (await queue.get())
+
+
+async def main(url, loop):
+    await asyncio.wait([start_client(url, loop), tick()])
+
+
+ARGS = argparse.ArgumentParser(
+    description="websocket console client for wssrv.py example.")
+ARGS.add_argument(
+    '--host', action="store", dest='host',
+    default='127.0.0.1', help='Host name')
+ARGS.add_argument(
+    '--port', action="store", dest='port',
+    default=8080, type=int, help='Port number')
+
+if __name__ == '__main__':
+    args = ARGS.parse_args()
+    if ':' in args.host:
+        args.host, port = args.host.split(':', 1)
+        args.port = int(port)
+
+    url = 'http://{}:{}/ws/'.format(args.host, args.port)
+
+    loop = asyncio.get_event_loop()
+    loop.add_signal_handler(signal.SIGINT, loop.stop)
+    asyncio.Task(main(url, loop))
+    loop.run_forever()

websockets/tcp-chat/src/client.rs

@@ -0,0 +1,139 @@
+use actix::prelude::*;
+use std::str::FromStr;
+use std::time::Duration;
+use std::{io, net, thread};
+use tokio::io::{split, WriteHalf};
+use tokio::net::TcpStream;
+use tokio_util::codec::FramedRead;
+
+mod codec;
+
+#[actix_web::main]
+async fn main() {
+    // Connect to server
+    let addr = net::SocketAddr::from_str("127.0.0.1:12345").unwrap();
+
+    println!("Running chat client");
+
+    let stream = TcpStream::connect(&addr).await.unwrap();
+
+    let addr = ChatClient::create(|ctx| {
+        let (r, w) = split(stream);
+        ChatClient::add_stream(FramedRead::new(r, codec::ClientChatCodec), ctx);
+        ChatClient {
+            framed: actix::io::FramedWrite::new(w, codec::ClientChatCodec, ctx),
+        }
+    });
+
+    // start console loop
+    thread::spawn(move || loop {
+        let mut cmd = String::new();
+        if io::stdin().read_line(&mut cmd).is_err() {
+            println!("error");
+            return;
+        }
+
+        addr.do_send(ClientCommand(cmd));
+    });
+}
+
+struct ChatClient {
+    framed: actix::io::FramedWrite<
+        codec::ChatRequest,
+        WriteHalf<TcpStream>,
+        codec::ClientChatCodec,
+    >,
+}
+
+#[derive(Message)]
+#[rtype(result = "()")]
+struct ClientCommand(String);
+
+impl Actor for ChatClient {
+    type Context = Context<Self>;
+
+    fn started(&mut self, ctx: &mut Context<Self>) {
+        // start heartbeats otherwise server will disconnect after 10 seconds
+        self.hb(ctx)
+    }
+
+    fn stopped(&mut self, _: &mut Context<Self>) {
+        println!("Disconnected");
+
+        // Stop application on disconnect
+        System::current().stop();
+    }
+}
+
+impl ChatClient {
+    fn hb(&self, ctx: &mut Context<Self>) {
+        ctx.run_later(Duration::new(1, 0), |act, ctx| {
+            act.framed.write(codec::ChatRequest::Ping);
+            act.hb(ctx);
+
+            // client should also check for a timeout here, similar to the
+            // server code
+        });
+    }
+}
+
+impl actix::io::WriteHandler<io::Error> for ChatClient {}
+
+/// Handle stdin commands
+impl Handler<ClientCommand> for ChatClient {
+    type Result = ();
+
+    fn handle(&mut self, msg: ClientCommand, _: &mut Context<Self>) {
+        let m = msg.0.trim();
+        if m.is_empty() {
+            return;
+        }
+
+        // we check for /sss type of messages
+        if m.starts_with('/') {
+            let v: Vec<&str> = m.splitn(2, ' ').collect();
+            match v[0] {
+                "/list" => {
+                    self.framed.write(codec::ChatRequest::List);
+                }
+                "/join" => {
+                    if v.len() == 2 {
+                        self.framed.write(codec::ChatRequest::Join(v[1].to_owned()));
+                    } else {
+                        println!("!!! room name is required");
+                    }
+                }
+                _ => println!("!!! unknown command"),
+            }
+        } else {
+            self.framed.write(codec::ChatRequest::Message(m.to_owned()));
+        }
+    }
+}
+
+/// Server communication
+
+impl StreamHandler<Result<codec::ChatResponse, io::Error>> for ChatClient {
+    fn handle(
+        &mut self,
+        msg: Result<codec::ChatResponse, io::Error>,
+        ctx: &mut Context<Self>,
+    ) {
+        match msg {
+            Ok(codec::ChatResponse::Message(ref msg)) => {
+                println!("message: {}", msg);
+            }
+            Ok(codec::ChatResponse::Joined(ref msg)) => {
+                println!("!!! joined: {}", msg);
+            }
+            Ok(codec::ChatResponse::Rooms(rooms)) => {
+                println!("\n!!! Available rooms:");
+                for room in rooms {
+                    println!("{}", room);
+                }
+                println!();
+            }
+            _ => ctx.stop(),
+        }
+    }
+}

websockets/tcp-chat/src/codec.rs

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+#![allow(dead_code)]
+use std::io;
+
+use actix::prelude::*;
+use actix_codec::{Decoder, Encoder};
+use byteorder::{BigEndian, ByteOrder};
+use bytes::{BufMut, BytesMut};
+use serde::{Deserialize, Serialize};
+use serde_json as json;
+
+/// Client request
+#[derive(Serialize, Deserialize, Debug, Message)]
+#[rtype(result = "()")]
+#[serde(tag = "cmd", content = "data")]
+pub enum ChatRequest {
+    /// List rooms
+    List,
+    /// Join rooms
+    Join(String),
+    /// Send message
+    Message(String),
+    /// Ping
+    Ping,
+}
+
+/// Server response
+#[derive(Serialize, Deserialize, Debug, Message)]
+#[rtype(result = "()")]
+#[serde(tag = "cmd", content = "data")]
+pub enum ChatResponse {
+    Ping,
+
+    /// List of rooms
+    Rooms(Vec<String>),
+
+    /// Joined
+    Joined(String),
+
+    /// Message
+    Message(String),
+}
+
+/// Codec for Client -> Server transport
+pub struct ChatCodec;
+
+impl Decoder for ChatCodec {
+    type Item = ChatRequest;
+    type Error = io::Error;
+
+    fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
+        let size = {
+            if src.len() < 2 {
+                return Ok(None);
+            }
+            BigEndian::read_u16(src.as_ref()) as usize
+        };
+
+        if src.len() >= size + 2 {
+            let _ = src.split_to(2);
+            let buf = src.split_to(size);
+            Ok(Some(json::from_slice::<ChatRequest>(&buf)?))
+        } else {
+            Ok(None)
+        }
+    }
+}
+
+impl Encoder<ChatResponse> for ChatCodec {
+    type Error = io::Error;
+
+    fn encode(
+        &mut self,
+        msg: ChatResponse,
+        dst: &mut BytesMut,
+    ) -> Result<(), Self::Error> {
+        let msg = json::to_string(&msg).unwrap();
+        let msg_ref: &[u8] = msg.as_ref();
+
+        dst.reserve(msg_ref.len() + 2);
+        dst.put_u16(msg_ref.len() as u16);
+        dst.put(msg_ref);
+
+        Ok(())
+    }
+}
+
+/// Codec for Server -> Client transport
+pub struct ClientChatCodec;
+
+impl Decoder for ClientChatCodec {
+    type Item = ChatResponse;
+    type Error = io::Error;
+
+    fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
+        let size = {
+            if src.len() < 2 {
+                return Ok(None);
+            }
+            BigEndian::read_u16(src.as_ref()) as usize
+        };
+
+        if src.len() >= size + 2 {
+            let _ = src.split_to(2);
+            let buf = src.split_to(size);
+            Ok(Some(json::from_slice::<ChatResponse>(&buf)?))
+        } else {
+            Ok(None)
+        }
+    }
+}
+
+impl Encoder<ChatRequest> for ClientChatCodec {
+    type Error = io::Error;
+
+    fn encode(
+        &mut self,
+        msg: ChatRequest,
+        dst: &mut BytesMut,
+    ) -> Result<(), Self::Error> {
+        let msg = json::to_string(&msg).unwrap();
+        let msg_ref: &[u8] = msg.as_ref();
+
+        dst.reserve(msg_ref.len() + 2);
+        dst.put_u16(msg_ref.len() as u16);
+        dst.put(msg_ref);
+
+        Ok(())
+    }
+}

websockets/tcp-chat/src/main.rs

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+use std::time::{Duration, Instant};
+
+use actix::*;
+use actix_files as fs;
+use actix_web::{web, App, Error, HttpRequest, HttpResponse, HttpServer};
+use actix_web_actors::ws;
+
+mod codec;
+mod server;
+mod session;
+
+/// How often heartbeat pings are sent
+const HEARTBEAT_INTERVAL: Duration = Duration::from_secs(5);
+/// How long before lack of client response causes a timeout
+const CLIENT_TIMEOUT: Duration = Duration::from_secs(10);
+
+/// Entry point for our route
+async fn chat_route(
+    req: HttpRequest,
+    stream: web::Payload,
+    srv: web::Data<Addr<server::ChatServer>>,
+) -> Result<HttpResponse, Error> {
+    ws::start(
+        WsChatSession {
+            id: 0,
+            hb: Instant::now(),
+            room: "Main".to_owned(),
+            name: None,
+            addr: srv.get_ref().clone(),
+        },
+        &req,
+        stream,
+    )
+}
+
+struct WsChatSession {
+    /// unique session id
+    id: usize,
+    /// Client must send ping at least once per 10 seconds (CLIENT_TIMEOUT),
+    /// otherwise we drop connection.
+    hb: Instant,
+    /// joined room
+    room: String,
+    /// peer name
+    name: Option<String>,
+    /// Chat server
+    addr: Addr<server::ChatServer>,
+}
+
+impl Actor for WsChatSession {
+    type Context = ws::WebsocketContext<Self>;
+
+    /// Method is called on actor start.
+    /// We register ws session with ChatServer
+    fn started(&mut self, ctx: &mut Self::Context) {
+        // we'll start heartbeat process on session start.
+        self.hb(ctx);
+
+        // register self in chat server. `AsyncContext::wait` register
+        // future within context, but context waits until this future resolves
+        // before processing any other events.
+        // HttpContext::state() is instance of WsChatSessionState, state is shared
+        // across all routes within application
+        let addr = ctx.address();
+        self.addr
+            .send(server::Connect {
+                addr: addr.recipient(),
+            })
+            .into_actor(self)
+            .then(|res, act, ctx| {
+                match res {
+                    Ok(res) => act.id = res,
+                    // something is wrong with chat server
+                    _ => ctx.stop(),
+                }
+                fut::ready(())
+            })
+            .wait(ctx);
+    }
+
+    fn stopping(&mut self, _: &mut Self::Context) -> Running {
+        // notify chat server
+        self.addr.do_send(server::Disconnect { id: self.id });
+        Running::Stop
+    }
+}
+
+/// Handle messages from chat server, we simply send it to peer websocket
+impl Handler<session::Message> for WsChatSession {
+    type Result = ();
+
+    fn handle(&mut self, msg: session::Message, ctx: &mut Self::Context) {
+        ctx.text(msg.0);
+    }
+}
+
+/// WebSocket message handler
+impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for WsChatSession {
+    fn handle(
+        &mut self,
+        msg: Result<ws::Message, ws::ProtocolError>,
+        ctx: &mut Self::Context,
+    ) {
+        let msg = match msg {
+            Err(_) => {
+                ctx.stop();
+                return;
+            }
+            Ok(msg) => msg,
+        };
+
+        println!("WEBSOCKET MESSAGE: {:?}", msg);
+        match msg {
+            ws::Message::Ping(msg) => {
+                self.hb = Instant::now();
+                ctx.pong(&msg);
+            }
+            ws::Message::Pong(_) => {
+                self.hb = Instant::now();
+            }
+            ws::Message::Text(text) => {
+                let m = text.trim();
+                // we check for /sss type of messages
+                if m.starts_with('/') {
+                    let v: Vec<&str> = m.splitn(2, ' ').collect();
+                    match v[0] {
+                        "/list" => {
+                            // Send ListRooms message to chat server and wait for
+                            // response
+                            println!("List rooms");
+                            self.addr
+                                .send(server::ListRooms)
+                                .into_actor(self)
+                                .then(|res, _, ctx| {
+                                    match res {
+                                        Ok(rooms) => {
+                                            for room in rooms {
+                                                ctx.text(room);
+                                            }
+                                        }
+                                        _ => println!("Something is wrong"),
+                                    }
+                                    fut::ready(())
+                                })
+                                .wait(ctx)
+                            // .wait(ctx) pauses all events in context,
+                            // so actor wont receive any new messages until it get list
+                            // of rooms back
+                        }
+                        "/join" => {
+                            if v.len() == 2 {
+                                self.room = v[1].to_owned();
+                                self.addr.do_send(server::Join {
+                                    id: self.id,
+                                    name: self.room.clone(),
+                                });
+
+                                ctx.text("joined");
+                            } else {
+                                ctx.text("!!! room name is required");
+                            }
+                        }
+                        "/name" => {
+                            if v.len() == 2 {
+                                self.name = Some(v[1].to_owned());
+                            } else {
+                                ctx.text("!!! name is required");
+                            }
+                        }
+                        _ => ctx.text(format!("!!! unknown command: {:?}", m)),
+                    }
+                } else {
+                    let msg = if let Some(ref name) = self.name {
+                        format!("{}: {}", name, m)
+                    } else {
+                        m.to_owned()
+                    };
+                    // send message to chat server
+                    self.addr.do_send(server::Message {
+                        id: self.id,
+                        msg,
+                        room: self.room.clone(),
+                    })
+                }
+            }
+            ws::Message::Binary(_) => println!("Unexpected binary"),
+            ws::Message::Close(reason) => {
+                ctx.close(reason);
+                ctx.stop();
+            }
+            _ => (),
+        }
+    }
+}
+
+impl WsChatSession {
+    /// helper method that sends ping to client every second.
+    ///
+    /// also this method checks heartbeats from client
+    fn hb(&self, ctx: &mut ws::WebsocketContext<Self>) {
+        ctx.run_interval(HEARTBEAT_INTERVAL, |act, ctx| {
+            // check client heartbeats
+            if Instant::now().duration_since(act.hb) > CLIENT_TIMEOUT {
+                // heartbeat timed out
+                println!("Websocket Client heartbeat failed, disconnecting!");
+
+                // notify chat server
+                act.addr.do_send(server::Disconnect { id: act.id });
+
+                // stop actor
+                ctx.stop();
+
+                // don't try to send a ping
+                return;
+            }
+
+            ctx.ping(b"");
+        });
+    }
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    env_logger::init();
+
+    // Start chat server actor
+    let server = server::ChatServer::default().start();
+
+    // Start tcp server in separate thread
+    let srv = server.clone();
+    session::tcp_server("127.0.0.1:12345", srv);
+
+    println!("Started http server: 127.0.0.1:8080");
+
+    // Create Http server with websocket support
+    HttpServer::new(move || {
+        App::new()
+            .data(server.clone())
+            // redirect to websocket.html
+            .service(web::resource("/").route(web::get().to(|| {
+                HttpResponse::Found()
+                    .header("LOCATION", "/static/websocket.html")
+                    .finish()
+            })))
+            // websocket
+            .service(web::resource("/ws/").to(chat_route))
+            // static resources
+            .service(fs::Files::new("/static/", "static/"))
+    })
+    .bind("127.0.0.1:8080")?
+    .run()
+    .await
+}

websockets/tcp-chat/src/server.rs

@@ -0,0 +1,199 @@
+//! `ChatServer` is an actor. It maintains list of connection client session.
+//! And manages available rooms. Peers send messages to other peers in same
+//! room through `ChatServer`.
+
+use actix::prelude::*;
+use rand::{self, rngs::ThreadRng, Rng};
+use std::collections::{HashMap, HashSet};
+
+use crate::session;
+
+/// Message for chat server communications
+
+/// New chat session is created
+#[derive(Message)]
+#[rtype(usize)]
+pub struct Connect {
+    pub addr: Recipient<session::Message>,
+}
+
+/// Session is disconnected
+#[derive(Message)]
+#[rtype(result = "()")]
+pub struct Disconnect {
+    pub id: usize,
+}
+
+/// Send message to specific room
+#[derive(Message)]
+#[rtype(result = "()")]
+pub struct Message {
+    /// Id of the client session
+    pub id: usize,
+    /// Peer message
+    pub msg: String,
+    /// Room name
+    pub room: String,
+}
+
+/// List of available rooms
+pub struct ListRooms;
+
+impl actix::Message for ListRooms {
+    type Result = Vec<String>;
+}
+
+/// Join room, if room does not exists create new one.
+#[derive(Message)]
+#[rtype(result = "()")]
+pub struct Join {
+    /// Client id
+    pub id: usize,
+    /// Room name
+    pub name: String,
+}
+
+/// `ChatServer` manages chat rooms and responsible for coordinating chat
+/// session. implementation is super primitive
+pub struct ChatServer {
+    sessions: HashMap<usize, Recipient<session::Message>>,
+    rooms: HashMap<String, HashSet<usize>>,
+    rng: ThreadRng,
+}
+
+impl Default for ChatServer {
+    fn default() -> ChatServer {
+        // default room
+        let mut rooms = HashMap::new();
+        rooms.insert("Main".to_owned(), HashSet::new());
+
+        ChatServer {
+            sessions: HashMap::new(),
+            rooms,
+            rng: rand::thread_rng(),
+        }
+    }
+}
+
+impl ChatServer {
+    /// Send message to all users in the room
+    fn send_message(&self, room: &str, message: &str, skip_id: usize) {
+        if let Some(sessions) = self.rooms.get(room) {
+            for id in sessions {
+                if *id != skip_id {
+                    if let Some(addr) = self.sessions.get(id) {
+                        let _ = addr.do_send(session::Message(message.to_owned()));
+                    }
+                }
+            }
+        }
+    }
+}
+
+/// Make actor from `ChatServer`
+impl Actor for ChatServer {
+    /// We are going to use simple Context, we just need ability to communicate
+    /// with other actors.
+    type Context = Context<Self>;
+}
+
+/// Handler for Connect message.
+///
+/// Register new session and assign unique id to this session
+impl Handler<Connect> for ChatServer {
+    type Result = usize;
+
+    fn handle(&mut self, msg: Connect, _: &mut Context<Self>) -> Self::Result {
+        println!("Someone joined");
+
+        // notify all users in same room
+        self.send_message(&"Main".to_owned(), "Someone joined", 0);
+
+        // register session with random id
+        let id = self.rng.gen::<usize>();
+        self.sessions.insert(id, msg.addr);
+
+        // auto join session to Main room
+        self.rooms.get_mut(&"Main".to_owned()).unwrap().insert(id);
+
+        // send id back
+        id
+    }
+}
+
+/// Handler for Disconnect message.
+impl Handler<Disconnect> for ChatServer {
+    type Result = ();
+
+    fn handle(&mut self, msg: Disconnect, _: &mut Context<Self>) {
+        println!("Someone disconnected");
+
+        let mut rooms: Vec<String> = Vec::new();
+
+        // remove address
+        if self.sessions.remove(&msg.id).is_some() {
+            // remove session from all rooms
+            for (name, sessions) in &mut self.rooms {
+                if sessions.remove(&msg.id) {
+                    rooms.push(name.to_owned());
+                }
+            }
+        }
+        // send message to other users
+        for room in rooms {
+            self.send_message(&room, "Someone disconnected", 0);
+        }
+    }
+}
+
+/// Handler for Message message.
+impl Handler<Message> for ChatServer {
+    type Result = ();
+
+    fn handle(&mut self, msg: Message, _: &mut Context<Self>) {
+        self.send_message(&msg.room, msg.msg.as_str(), msg.id);
+    }
+}
+
+/// Handler for `ListRooms` message.
+impl Handler<ListRooms> for ChatServer {
+    type Result = MessageResult<ListRooms>;
+
+    fn handle(&mut self, _: ListRooms, _: &mut Context<Self>) -> Self::Result {
+        let mut rooms = Vec::new();
+
+        for key in self.rooms.keys() {
+            rooms.push(key.to_owned())
+        }
+
+        MessageResult(rooms)
+    }
+}
+
+/// Join room, send disconnect message to old room
+/// send join message to new room
+impl Handler<Join> for ChatServer {
+    type Result = ();
+
+    fn handle(&mut self, msg: Join, _: &mut Context<Self>) {
+        let Join { id, name } = msg;
+        let mut rooms = Vec::new();
+
+        // remove session from all rooms
+        for (n, sessions) in &mut self.rooms {
+            if sessions.remove(&id) {
+                rooms.push(n.to_owned());
+            }
+        }
+        // send message to other users
+        for room in rooms {
+            self.send_message(&room, "Someone disconnected", 0);
+        }
+
+        if self.rooms.get_mut(&name).is_none() {
+            self.rooms.insert(name.clone(), HashSet::new());
+        }
+        self.send_message(&name, "Someone connected", id);
+        self.rooms.get_mut(&name).unwrap().insert(id);
+    }
+}

websockets/tcp-chat/src/session.rs

@@ -0,0 +1,201 @@
+//! `ClientSession` is an actor, it manages peer tcp connection and
+//! proxies commands from peer to `ChatServer`.
+use std::str::FromStr;
+use std::time::{Duration, Instant};
+use std::{io, net};
+
+use futures::StreamExt;
+use tokio::io::{split, WriteHalf};
+use tokio::net::{TcpListener, TcpStream};
+use tokio_util::codec::FramedRead;
+
+use actix::prelude::*;
+
+use crate::codec::{ChatCodec, ChatRequest, ChatResponse};
+use crate::server::{self, ChatServer};
+
+/// Chat server sends this messages to session
+#[derive(Message)]
+#[rtype(result = "()")]
+pub struct Message(pub String);
+
+/// `ChatSession` actor is responsible for tcp peer communications.
+pub struct ChatSession {
+    /// unique session id
+    id: usize,
+    /// this is address of chat server
+    addr: Addr<ChatServer>,
+    /// Client must send ping at least once per 10 seconds, otherwise we drop
+    /// connection.
+    hb: Instant,
+    /// joined room
+    room: String,
+    /// Framed wrapper
+    framed: actix::io::FramedWrite<ChatResponse, WriteHalf<TcpStream>, ChatCodec>,
+}
+
+impl Actor for ChatSession {
+    /// For tcp communication we are going to use `FramedContext`.
+    /// It is convenient wrapper around `Framed` object from `tokio_io`
+    type Context = Context<Self>;
+
+    fn started(&mut self, ctx: &mut Self::Context) {
+        // we'll start heartbeat process on session start.
+        self.hb(ctx);
+
+        // register self in chat server. `AsyncContext::wait` register
+        // future within context, but context waits until this future resolves
+        // before processing any other events.
+        let addr = ctx.address();
+        self.addr
+            .send(server::Connect {
+                addr: addr.recipient(),
+            })
+            .into_actor(self)
+            .then(|res, act, ctx| {
+                match res {
+                    Ok(res) => act.id = res,
+                    // something is wrong with chat server
+                    _ => ctx.stop(),
+                }
+                actix::fut::ready(())
+            })
+            .wait(ctx);
+    }
+
+    fn stopping(&mut self, _: &mut Self::Context) -> Running {
+        // notify chat server
+        self.addr.do_send(server::Disconnect { id: self.id });
+        Running::Stop
+    }
+}
+
+impl actix::io::WriteHandler<io::Error> for ChatSession {}
+
+/// To use `Framed` we have to define Io type and Codec
+impl StreamHandler<Result<ChatRequest, io::Error>> for ChatSession {
+    /// This is main event loop for client requests
+    fn handle(&mut self, msg: Result<ChatRequest, io::Error>, ctx: &mut Context<Self>) {
+        match msg {
+            Ok(ChatRequest::List) => {
+                // Send ListRooms message to chat server and wait for response
+                println!("List rooms");
+                self.addr
+                    .send(server::ListRooms)
+                    .into_actor(self)
+                    .then(|res, act, _| {
+                        match res {
+                            Ok(rooms) => {
+                                act.framed.write(ChatResponse::Rooms(rooms));
+                            }
+                            _ => println!("Something is wrong"),
+                        }
+                        actix::fut::ready(())
+                    })
+                    .wait(ctx)
+                // .wait(ctx) pauses all events in context,
+                // so actor wont receive any new messages until it get list of rooms back
+            }
+            Ok(ChatRequest::Join(name)) => {
+                println!("Join to room: {}", name);
+                self.room = name.clone();
+                self.addr.do_send(server::Join {
+                    id: self.id,
+                    name: name.clone(),
+                });
+                self.framed.write(ChatResponse::Joined(name));
+            }
+            Ok(ChatRequest::Message(message)) => {
+                // send message to chat server
+                println!("Peer message: {}", message);
+                self.addr.do_send(server::Message {
+                    id: self.id,
+                    msg: message,
+                    room: self.room.clone(),
+                })
+            }
+            // we update heartbeat time on ping from peer
+            Ok(ChatRequest::Ping) => self.hb = Instant::now(),
+            _ => ctx.stop(),
+        }
+    }
+}
+
+/// Handler for Message, chat server sends this message, we just send string to
+/// peer
+impl Handler<Message> for ChatSession {
+    type Result = ();
+
+    fn handle(&mut self, msg: Message, _: &mut Context<Self>) {
+        // send message to peer
+        self.framed.write(ChatResponse::Message(msg.0));
+    }
+}
+
+/// Helper methods
+impl ChatSession {
+    pub fn new(
+        addr: Addr<ChatServer>,
+        framed: actix::io::FramedWrite<ChatResponse, WriteHalf<TcpStream>, ChatCodec>,
+    ) -> ChatSession {
+        ChatSession {
+            id: 0,
+            addr,
+            hb: Instant::now(),
+            room: "Main".to_owned(),
+            framed,
+        }
+    }
+
+    /// helper method that sends ping to client every second.
+    ///
+    /// also this method check heartbeats from client
+    fn hb(&self, ctx: &mut Context<Self>) {
+        ctx.run_interval(Duration::new(1, 0), |act, ctx| {
+            // check client heartbeats
+            if Instant::now().duration_since(act.hb) > Duration::new(10, 0) {
+                // heartbeat timed out
+                println!("Client heartbeat failed, disconnecting!");
+
+                // notify chat server
+                act.addr.do_send(server::Disconnect { id: act.id });
+
+                // stop actor
+                ctx.stop();
+            }
+
+            act.framed.write(ChatResponse::Ping);
+            // if we can not send message to sink, sink is closed (disconnected)
+        });
+    }
+}
+
+/// Define tcp server that will accept incoming tcp connection and create
+/// chat actors.
+pub fn tcp_server(_s: &str, server: Addr<ChatServer>) {
+    // Create server listener
+    let addr = net::SocketAddr::from_str("127.0.0.1:12345").unwrap();
+
+    actix_web::rt::spawn(async move {
+        let server = server.clone();
+        let mut listener = TcpListener::bind(&addr).await.unwrap();
+        let mut incoming = listener.incoming();
+
+        while let Some(stream) = incoming.next().await {
+            match stream {
+                Ok(stream) => {
+                    let server = server.clone();
+                    ChatSession::create(|ctx| {
+                        let (r, w) = split(stream);
+                        ChatSession::add_stream(FramedRead::new(r, ChatCodec), ctx);
+                        ChatSession::new(
+                            server,
+                            actix::io::FramedWrite::new(w, ChatCodec, ctx),
+                        )
+                    });
+                }
+                Err(_) => return,
+            }
+        }
+    });
+}

websockets/tcp-chat/static/websocket.html

@@ -0,0 +1,90 @@
+<!DOCTYPE html>
+<meta charset="utf-8" />
+<html>
+<head>
+<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js">
+</script>
+  <script language="javascript" type="text/javascript">
+    $(function() {
+      var conn = null;
+      function log(msg) {
+        var control = $('#log');
+        control.html(control.html() + msg + '<br/>');
+        control.scrollTop(control.scrollTop() + 1000);
+      }
+      function connect() {
+        disconnect();
+        var wsUri = (window.location.protocol=='https:'&&'wss://'||'ws://')+window.location.host + '/ws/';
+        conn = new WebSocket(wsUri);
+        log('Connecting...');
+        conn.onopen = function() {
+          log('Connected.');
+          update_ui();
+        };
+        conn.onmessage = function(e) {
+          log('Received: ' + e.data);
+        };
+        conn.onclose = function() {
+          log('Disconnected.');
+          conn = null;
+          update_ui();
+        };
+      }
+      function disconnect() {
+        if (conn != null) {
+          log('Disconnecting...');
+          conn.close();
+          conn = null;
+          update_ui();
+        }
+      }
+      function update_ui() {
+        var msg = '';
+        if (conn == null) {
+          $('#status').text('disconnected');
+          $('#connect').html('Connect');
+        } else {
+          $('#status').text('connected (' + conn.protocol + ')');
+          $('#connect').html('Disconnect');
+        }
+      }
+      $('#connect').click(function() {
+        if (conn == null) {
+          connect();
+        } else {
+          disconnect();
+        }
+        update_ui();
+        return false;
+      });
+      $('#send').click(function() {
+        var text = $('#text').val();
+        log('Sending: ' + text);
+        conn.send(text);
+        $('#text').val('').focus();
+        return false;
+      });
+      $('#text').keyup(function(e) {
+        if (e.keyCode === 13) {
+          $('#send').click();
+          return false;
+        }
+      });
+    });
+</script>
+</head>
+<body>
+<h3>Chat!</h3>
+<div>
+  <button id="connect">Connect</button>&nbsp;|&nbsp;Status:
+  <span id="status">disconnected</span>
+</div>
+<div id="log"
+     style="width:20em;height:15em;overflow:auto;border:1px solid black">
+</div>
+<form id="chatform" onsubmit="return false;">
+  <input id="text" type="text" />
+  <input id="send" type="button" value="Send" />
+</form>
+</body>
+</html>