Hexbear is the engine that powers Chapochat. It is a customization of the Lemmy project.
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extern crate server;
#[macro_use] extern crate diesel_migrations;
use std::time::{Instant, Duration};
use std::env;
use server::actix::*;
use server::actix_web::server::HttpServer;
use server::actix_web::{ws, App, Error, HttpRequest, HttpResponse, fs::NamedFile, fs};
use server::websocket_server::server::*;
use server::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<ChatServer>,
}
/// Entry point for our route
fn chat_route(req: &HttpRequest<WsChatSessionState>) -> Result<HttpResponse, Error> {
ws::start(
req,
WSSession {
id: 0,
hb: Instant::now()
},
)
}
struct WSSession {
/// unique session id
id: usize,
/// 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<Self, WsChatSessionState>;
/// 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(),
})
.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 });
Running::Stop
}
}
/// Handle messages from chat server, we simply send it to peer websocket
impl Handler<WSMessage> 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<ws::Message, ws::ProtocolError> 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();
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);
// ctx.text(e);
}
}
// Ok(res) => ctx.text(res),
// // something is wrong with chat server
// _ => ctx.stop(),
fut::ok(())
})
.wait(ctx);
// 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");
// ctx.state()
// .addr
// .send(ListRooms)
// .into_actor(self)
// .then(|res, _, ctx| {
// match res {
// Ok(rooms) => {
// for room in rooms {
// ctx.text(room);
// }
// }
// _ => println!("Something is wrong"),
// }
// fut::ok(())
// })
// .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();
// ctx.state().addr.do_send(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
// ctx.state().addr.do_send(ClientMessage {
// id: self.id,
// msg: msg,
// room: self.room.clone(),
// })
// }
}
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<Self, WsChatSessionState>) {
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 });
// 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("0.0.0.0:8080")
.unwrap()
.start();
println!("Started http server: 0.0.0.0:8080");
let _ = sys.run();
}
fn index(_req: &HttpRequest<WsChatSessionState>) -> Result<NamedFile, actix_web::error::Error> {
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())
}