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use super::Cors;
use anyhow::bail;
use chashmap::CHashMap;
use futures::{SinkExt, StreamExt};
use log::warn;
use rocket::{get, State};
use rocket_ws::{stream::DuplexStream, Channel, Message, WebSocket};
use serde::{Deserialize, Serialize};
use tokio::sync::broadcast::{self, Sender};
#[derive(Default)]
pub struct PlayersyncChannels {
channels: CHashMap<String, broadcast::Sender<Message>>,
}
#[derive(Serialize, Deserialize, Debug, Clone)]
#[serde(rename_all = "snake_case")]
pub enum Packet {
Time(f64),
Playing(bool),
Join(String),
Leave(String),
}
#[get("/playersync/<channel>")]
pub fn r_playersync(
ws: WebSocket,
state: &State<PlayersyncChannels>,
channel: &str,
) -> Cors<Channel<'static>> {
let sender = state
.channels
.get(&channel.to_owned())
.map(|x| x.to_owned())
.unwrap_or_else(|| {
let ch = broadcast::channel(16).0;
state.channels.insert(channel.to_owned(), ch.clone());
ch
});
Cors(ws.channel(move |ws| {
Box::pin(async move {
let mut state = ClientState {
username: "unknown user".into(),
};
if let Err(e) = handle_socket(&sender, ws, &mut state).await {
warn!("streamsync websocket error: {e:?}")
}
let _ = sender.send(Message::Text(
serde_json::to_string(&Packet::Leave(state.username)).unwrap(),
));
Ok(())
})
}))
}
struct ClientState {
username: String,
}
async fn handle_socket(
broadcast: &Sender<Message>,
mut ws: DuplexStream,
state: &mut ClientState,
) -> anyhow::Result<()> {
let mut sub = broadcast.subscribe();
loop {
tokio::select! {
message = ws.next() => {
match handle_packet(broadcast, message,state) {
Err(e) => Err(e)?,
Ok(true) => return Ok(()),
Ok(false) => ()
}
},
message = sub.recv() => {
ws.send(message?).await?;
}
};
}
}
fn handle_packet(
broadcast: &Sender<Message>,
message: Option<rocket_ws::result::Result<Message>>,
state: &mut ClientState,
) -> anyhow::Result<bool> {
let Some(message) = message else {
return Ok(true);
};
let message = message?.into_text()?;
let packet: Packet = serde_json::from_str(&message)?;
let broadcast = |p: Packet| -> anyhow::Result<()> {
broadcast.send(Message::Text(serde_json::to_string(&p)?))?;
Ok(())
};
match packet {
Packet::Join(username) => {
broadcast(Packet::Join(username.clone()))?;
state.username = username;
}
Packet::Leave(_) => bail!("illegal packet"),
p => broadcast(p)?,
};
Ok(false)
}
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