Hexbear is the engine that powers Chapochat. It is a customization of the Lemmy project.
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use crate::websocket::server::*;
use actix::prelude::*;
use actix_web::web;
use actix_web::*;
use actix_web_actors::ws;
use log::{error, info};
use std::time::{Duration, Instant};
pub fn config(cfg: &mut web::ServiceConfig) {
cfg.service(web::resource("/api/v1/ws").to(chat_route));
}
/// 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,
chat_server: web::Data<Addr<ChatServer>>,
) -> Result<HttpResponse, Error> {
// TODO not sure if the blocking should be here or not
ws::start(
WSSession {
cs_addr: chat_server.get_ref().to_owned(),
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(),
},
&req,
stream,
)
}
struct WSSession {
cs_addr: Addr<ChatServer>,
/// 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,
// db: Pool<ConnectionManager<PgConnection>>,
}
impl Actor for WSSession {
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.
// across all routes within application
let addr = ctx.address();
self
.cs_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(),
}
actix::fut::ready(())
})
.wait(ctx);
}
fn stopping(&mut self, _ctx: &mut Self::Context) -> Running {
// notify chat server
self.cs_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<WSMessage> for WSSession {
type Result = ();
fn handle(&mut self, msg: WSMessage, ctx: &mut Self::Context) {
ctx.text(msg.0);
}
}
/// WebSocket message handler
impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for WSSession {
fn handle(&mut self, result: Result<ws::Message, ws::ProtocolError>, ctx: &mut Self::Context) {
let message = match result {
Ok(m) => m,
Err(e) => {
error!("{}", e);
return;
}
};
match message {
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();
info!("Message received: {:?} from id: {}", &m, self.id);
self
.cs_addr
.send(StandardMessage {
id: self.id,
msg: m,
})
.into_actor(self)
.then(|res, _, ctx| {
match res {
Ok(res) => ctx.text(res),
Err(e) => {
error!("{}", &e);
}
}
actix::fut::ready(())
})
.wait(ctx);
}
ws::Message::Binary(_bin) => info!("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>) {
ctx.run_interval(HEARTBEAT_INTERVAL, |act, ctx| {
// check client heartbeats
if Instant::now().duration_since(act.hb) > CLIENT_TIMEOUT {
// heartbeat timed out
error!("Websocket Client heartbeat failed, disconnecting!");
// notify chat server
act.cs_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(b"");
});
}
}