watch-party/src/viewer_connection.rs

94 lines
2.6 KiB
Rust
Raw Normal View History

use once_cell::sync::Lazy;
use std::{
collections::HashMap,
sync::atomic::{AtomicUsize, Ordering},
};
use futures::{SinkExt, StreamExt, TryFutureExt};
use tokio::sync::{
mpsc::{self, UnboundedSender},
RwLock,
};
use tokio_stream::wrappers::UnboundedReceiverStream;
use uuid::Uuid;
use warp::ws::{Message, WebSocket};
use crate::{
events::WatchEvent,
watch_session::{get_session, handle_watch_event},
};
static CONNECTED_VIEWERS: Lazy<RwLock<HashMap<usize, ConnectedViewer>>> =
Lazy::new(|| RwLock::new(HashMap::new()));
static NEXT_VIEWER_ID: AtomicUsize = AtomicUsize::new(1);
pub struct ConnectedViewer {
pub session: Uuid,
pub viewer_id: usize,
pub tx: UnboundedSender<WatchEvent>,
}
pub async fn ws_subscribe(session_uuid: Uuid, ws: WebSocket) {
let viewer_id = NEXT_VIEWER_ID.fetch_add(1, Ordering::Relaxed);
let (mut viewer_ws_tx, mut viewer_ws_rx) = ws.split();
let (tx, rx) = mpsc::unbounded_channel::<WatchEvent>();
let mut rx = UnboundedReceiverStream::new(rx);
tokio::task::spawn(async move {
while let Some(event) = rx.next().await {
viewer_ws_tx
.send(Message::text(
serde_json::to_string(&event).expect("couldn't convert WatchEvent into JSON"),
))
.unwrap_or_else(|e| eprintln!("ws send error: {}", e))
.await;
}
});
CONNECTED_VIEWERS.write().await.insert(
viewer_id,
ConnectedViewer {
viewer_id,
session: session_uuid,
tx,
},
);
while let Some(Ok(message)) = viewer_ws_rx.next().await {
let event: WatchEvent = match message
.to_str()
.ok()
.and_then(|s| serde_json::from_str(s).ok())
{
Some(e) => e,
None => continue,
};
handle_watch_event(
session_uuid,
&mut get_session(session_uuid).unwrap(),
event.clone(),
);
ws_publish(session_uuid, Some(viewer_id), event).await;
}
CONNECTED_VIEWERS.write().await.remove(&viewer_id);
}
pub async fn ws_publish(session_uuid: Uuid, viewer_id: Option<usize>, event: WatchEvent) {
for viewer in CONNECTED_VIEWERS.read().await.values() {
if viewer_id == Some(viewer.viewer_id) {
continue;
}
if viewer.session != session_uuid {
continue;
}
let _ = viewer.tx.send(event.clone());
}
}