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/*
This file is part of keks-meet (https://codeberg.org/metamuffin/keks-meet)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2023 metamuffin <metamuffin.org>
*/
use crate::{
build_api,
crypto::{self, hash, Key},
peer::Peer,
protocol::{self, ClientboundPacket, RelayMessage, RelayMessageWrapper, ServerboundPacket},
signaling::{self, SignalingConnection},
Config, EventHandler, LocalResource,
};
use futures_util::{SinkExt, StreamExt};
use log::{debug, info, warn};
use std::{collections::HashMap, sync::Arc, time::Duration};
use tokio::sync::RwLock;
use webrtc::api::API;
pub struct Instance {
pub event_handler: Arc<dyn EventHandler>,
pub conn: SignalingConnection,
pub config: Config,
pub api: API,
key: RwLock<Option<Key>>,
pub local_resources: RwLock<HashMap<String, Box<dyn LocalResource>>>,
my_id: RwLock<Option<usize>>,
pub peers: RwLock<HashMap<usize, Arc<Peer>>>,
}
impl Instance {
pub async fn new(config: Config, event_handler: Arc<dyn EventHandler>) -> Arc<Self> {
let conn = signaling::SignalingConnection::new(&config.signaling_uri).await;
Arc::new(Self {
event_handler,
api: build_api(),
my_id: RwLock::new(None),
peers: Default::default(),
local_resources: Default::default(),
config,
conn,
key: None.into(),
})
}
pub async fn join(&self, secret: Option<&str>) {
info!("join room {secret:?}");
*self.key.write().await = secret.map(crypto::Key::derive);
self.send_packet(ServerboundPacket::Join {
hash: secret.map(hash),
})
.await;
}
pub async fn spawn_ping(self: &Arc<Self>) {
let blub = self.clone();
tokio::spawn(async move {
loop {
blub.ping().await;
debug!("ping");
tokio::time::sleep(Duration::from_secs(30)).await;
}
});
}
pub async fn ping(&self) {
self.conn
.send
.write()
.await
.send(ServerboundPacket::Ping)
.await
.unwrap();
}
pub async fn my_id(&self) -> usize {
self.my_id.read().await.expect("not initialized yet")
}
pub async fn receive_loop(self: Arc<Self>) {
while let Some(packet) = self.conn.recv.write().await.next().await {
let inst = self.clone();
inst.on_message(packet).await
}
}
pub async fn on_message(self: Arc<Self>, packet: ClientboundPacket) {
match packet {
protocol::ClientboundPacket::Init { your_id, version } => {
info!("server is running {version:?}");
*self.my_id.write().await = Some(your_id);
}
protocol::ClientboundPacket::ClientJoin { id } => {
if id == self.my_id().await {
// we joined - YAY!
} else {
let peer = Peer::create(self.clone(), id).await;
self.peers.write().await.insert(id, peer.clone());
peer.init_remote().await;
self.event_handler.peer_join(peer).await;
}
}
protocol::ClientboundPacket::ClientLeave { id } => {
if id == self.my_id().await {
// we left
} else if let Some(peer) = self.peers.write().await.remove(&id) {
peer.on_leave().await;
self.event_handler.peer_leave(peer).await;
}
}
protocol::ClientboundPacket::Message { sender, message } => {
let message = self
.key
.read()
.await
.as_ref()
.expect("not in a room")
.decrypt(&message);
let p = serde_json::from_str::<RelayMessageWrapper>(&message).unwrap();
if p.sender == sender {
self.on_relay(sender, p.inner).await;
} else {
warn!("dropping packet with inconsistent sender")
}
}
protocol::ClientboundPacket::RoomInfo { hash, user_count } => {
self.event_handler.room_info(hash, user_count).await;
}
}
}
pub async fn on_relay(&self, sender: usize, p: RelayMessage) {
debug!("(relay) <- ({sender}) {p:?}");
if let Some(peer) = self.peers.read().await.get(&sender) {
peer.on_relay(p.clone()).await;
self.event_handler.on_relay(peer.to_owned(), &p).await;
} else {
warn!("got a packet from a non-existent peer")
}
}
pub async fn send_packet(&self, packet: ServerboundPacket) {
self.conn
.send
.write()
.await
.send(packet)
.await
.expect("why?");
}
pub async fn send_relay(&self, recipient: Option<usize>, inner: RelayMessage) {
debug!("(relay) -> ({recipient:?}) {inner:?}");
self.send_packet(ServerboundPacket::Relay {
recipient,
// TODO handle this error
message: self
.key
.read()
.await
.as_ref()
.expect("not in a room")
.encrypt(
&serde_json::to_string(&RelayMessageWrapper {
sender: self.my_id.read().await.expect("not ready to relay yet.."),
inner,
})
.unwrap(),
),
})
.await
}
pub async fn add_local_resource(&self, res: Box<dyn LocalResource>) {
for (_pid, peer) in self.peers.read().await.iter() {
peer.send_relay(RelayMessage::Provide(res.info())).await;
}
self.local_resources
.write()
.await
.insert(res.info().id, res);
}
pub async fn remove_local_resource(&self, id: String) -> bool {
if let Some(_) = self.local_resources.write().await.remove(&id) {
for (_pid, peer) in self.peers.read().await.iter() {
peer.send_relay(RelayMessage::ProvideStop { id: id.clone() })
.await;
}
true
} else {
false
}
}
}
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