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use std::{collections::HashMap, pin::Pin, sync::Arc};
use futures_util::Future;
use log::warn;
use tokio::sync::{mpsc::UnboundedSender, RwLock};
use webrtc::api::API;
use crate::{
crypto::Key,
peer::Peer,
protocol::{self, ClientboundPacket, RelayMessage, RelayMessageWrapper, ServerboundPacket},
Config,
};
pub trait HasPeer {
fn peer(&self) -> &Arc<Peer>;
}
pub trait PeerInit<P> {
fn add_peer(
&self,
p: Arc<Peer>,
) -> Pin<Box<dyn Future<Output = Arc<P>> + 'static + Send + Sync>>;
}
pub struct State<P: HasPeer, I: PeerInit<P>> {
pub sup: Arc<I>,
pub config: Config,
pub api: API,
pub key: Key,
pub my_id: RwLock<Option<usize>>,
pub sender: UnboundedSender<ServerboundPacket>,
pub peers: RwLock<HashMap<usize, Arc<P>>>,
pub relay_tx: UnboundedSender<(usize, RelayMessage)>,
}
impl<P: HasPeer, I: PeerInit<P>> State<P, I> {
pub async fn my_id(&self) -> usize {
self.my_id.read().await.expect("not initialized yet")
}
pub async fn on_message(self: Arc<Self>, packet: ClientboundPacket) {
match packet {
protocol::ClientboundPacket::Init {
your_id,
version: _,
} => {
*self.my_id.write().await = Some(your_id);
}
protocol::ClientboundPacket::ClientJoin { id } => {
if id == self.my_id().await {
// we joined - YAY!
} else {
self.peers.write().await.insert(
id,
self.sup
.add_peer(Peer::create(self.clone(), self.relay_tx.clone(), id).await)
.await,
);
}
}
protocol::ClientboundPacket::ClientLeave { id: _ } => {}
protocol::ClientboundPacket::Message { sender, message } => {
let message = self.key.decrypt(&message);
let p = serde_json::from_str::<RelayMessageWrapper>(&message).unwrap();
self.on_relay(sender, p.inner).await;
}
}
}
pub async fn on_relay(&self, sender: usize, p: RelayMessage) {
if let Some(peer) = self.peers.read().await.get(&sender).cloned() {
peer.peer().on_relay(p).await
} else {
warn!("got a packet from a non-existent peer")
}
}
pub async fn send_relay(&self, recipient: usize, inner: RelayMessage) {
self.sender
.send(ServerboundPacket::Relay {
recipient: Some(recipient),
message: self.key.encrypt(
&serde_json::to_string(&RelayMessageWrapper {
sender: self.my_id.read().await.expect("not ready to relay yet.."),
inner,
})
.unwrap(),
),
})
.unwrap()
}
}
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