extern crate lemmy_server; #[macro_use] extern crate diesel_migrations; use std::time::{Instant, Duration}; use std::env; use lemmy_server::actix::*; use lemmy_server::actix_web::server::HttpServer; use lemmy_server::actix_web::{ws, App, Error, HttpRequest, HttpResponse, fs::NamedFile, fs}; use lemmy_server::websocket::server::*; use lemmy_server::db::establish_connection; embed_migrations!(); /// 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); /// This is our websocket route state, this state is shared with all route /// instances via `HttpContext::state()` struct WsChatSessionState { addr: Addr, } /// Entry point for our route fn chat_route(req: &HttpRequest) -> Result { ws::start( req, WSSession { id: 0, hb: Instant::now(), ip: req.connection_info() .remote() .unwrap_or("127.0.0.1:12345") .split(":") .next() .unwrap_or("127.0.0.1") .to_string() }, ) } struct WSSession { /// unique session id id: usize, ip: String, /// Client must send ping at least once per 10 seconds (CLIENT_TIMEOUT), /// otherwise we drop connection. hb: Instant } impl Actor for WSSession { type Context = ws::WebsocketContext; /// 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(); ctx.state() .addr .send(Connect { addr: addr.recipient(), ip: self.ip.to_owned(), }) .into_actor(self) .then(|res, act, ctx| { match res { Ok(res) => act.id = res, // something is wrong with chat server _ => ctx.stop(), } fut::ok(()) }) .wait(ctx); } fn stopping(&mut self, ctx: &mut Self::Context) -> Running { // notify chat server ctx.state().addr.do_send(Disconnect { id: self.id, ip: self.ip.to_owned(), }); Running::Stop } } /// Handle messages from chat server, we simply send it to peer websocket /// These are room messages, IE sent to others in the room impl Handler for WSSession { type Result = (); fn handle(&mut self, msg: WSMessage, ctx: &mut Self::Context) { // println!("id: {} msg: {}", self.id, msg.0); ctx.text(msg.0); } } /// WebSocket message handler impl StreamHandler for WSSession { fn handle(&mut self, msg: ws::Message, ctx: &mut Self::Context) { // println!("WEBSOCKET MESSAGE: {:?} from id: {}", msg, self.id); 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().to_owned(); println!("WEBSOCKET MESSAGE: {:?} from id: {}", &m, self.id); ctx.state() .addr .send(StandardMessage { id: self.id, msg: m, }) .into_actor(self) .then(|res, _, ctx| { match res { Ok(res) => ctx.text(res), Err(e) => { eprintln!("{}", &e); } } fut::ok(()) }) .wait(ctx); } ws::Message::Binary(_bin) => println!("Unexpected binary"), ws::Message::Close(_) => { ctx.stop(); }, } } } impl WSSession { /// helper method that sends ping to client every second. /// /// also this method checks heartbeats from client fn hb(&self, ctx: &mut ws::WebsocketContext) { 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 ctx.state() .addr .do_send(Disconnect { id: act.id, ip: act.ip.to_owned() }); // stop actor ctx.stop(); // don't try to send a ping return; } ctx.ping(""); }); } } fn main() { let _ = env_logger::init(); let sys = actix::System::new("lemmy"); // Run the migrations from code let conn = establish_connection(); embedded_migrations::run(&conn).unwrap(); // Start chat server actor in separate thread let server = Arbiter::start(|_| ChatServer::default()); // Create Http server with websocket support HttpServer::new(move || { // Websocket sessions state let state = WsChatSessionState { addr: server.clone(), }; App::with_state(state) // redirect to websocket.html // .resource("/", |r| r.method(http::Method::GET).f(|_| { // HttpResponse::Found() // .header("LOCATION", "/static/websocket.html") // .finish() // })) .resource("/service/ws", |r| r.route().f(chat_route)) // static resources .resource("/", |r| r.route().f(index)) .handler( "/static", fs::StaticFiles::new(front_end_dir()).unwrap() ) .finish() }).bind("0.0.0.0:8536") .unwrap() .start(); println!("Started http server: 0.0.0.0:8536"); let _ = sys.run(); } fn index(_req: &HttpRequest) -> Result { Ok(NamedFile::open(front_end_dir() + "/index.html")?) } fn front_end_dir() -> String { env::var("LEMMY_FRONT_END_DIR").unwrap_or("../ui/dist".to_string()) }