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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) 2022 metamuffin <metamuffin@disroot.org>
*/
use crate::{
instance::Instance,
protocol::{self, ProvideInfo, RelayMessage, Sdp},
};
use log::{debug, info, warn};
use std::{collections::HashMap, sync::Arc};
use tokio::sync::RwLock;
use webrtc::{
data_channel::RTCDataChannel,
ice_transport::{
ice_candidate::{RTCIceCandidate, RTCIceCandidateInit},
ice_server::RTCIceServer,
},
peer_connection::{
configuration::RTCConfiguration, peer_connection_state::RTCPeerConnectionState,
sdp::session_description::RTCSessionDescription, RTCPeerConnection,
},
track::track_remote::TrackRemote,
};
pub struct Peer {
pub inst: Arc<Instance>,
pub peer_connection: RTCPeerConnection,
pub remote_provided: RwLock<HashMap<String, ProvideInfo>>,
pub id: usize,
}
// pub struct RemoteResource {
// info: ProvideInfo,
// state: RemoteResourceInner,
// }
// // (Box<dyn FnOnce(Arc<TransportChannel>) -> Pin<Box<dyn Future<Output = ()>>>>)
// pub enum RemoteResourceInner {
// Disconnected,
// AwaitConnect,
// Connected(Arc<TransportChannel>),
// AwaitDisconnect,
// }
pub enum TransportChannel {
Track(Arc<TrackRemote>),
DataChannel(Arc<RTCDataChannel>),
}
impl Peer {
pub async fn create(inst: Arc<Instance>, id: usize) -> Arc<Self> {
info!("({id}) peer joined");
let config = RTCConfiguration {
ice_servers: vec![RTCIceServer {
urls: vec!["stun:metamuffin.org:16900".to_owned()],
..Default::default()
}],
..Default::default()
};
let peer_connection = inst.api.new_peer_connection(config).await.unwrap();
let peer = Arc::new(Self {
remote_provided: Default::default(),
inst: inst.clone(),
peer_connection,
id,
});
peer.peer_connection
.on_peer_connection_state_change(Box::new(move |s: RTCPeerConnectionState| {
info!("connection state changed: {s}");
Box::pin(async {})
}));
{
let weak = Arc::<Peer>::downgrade(&peer);
peer.peer_connection.on_ice_candidate(Box::new(move |c| {
if let Some(peer) = weak.upgrade() {
Box::pin(async move {
if let Some(c) = c {
peer.on_ice_candidate(c).await
}
})
} else {
Box::pin(async move {})
}
}))
}
{
let weak = Arc::<Peer>::downgrade(&peer);
peer.peer_connection.on_negotiation_needed(Box::new(move || {
let peer = weak.upgrade().unwrap();
Box::pin(async { peer.on_negotiation_needed().await })
}))
}
{
let weak = Arc::<Peer>::downgrade(&peer);
peer.peer_connection
.on_track(Box::new(move |track_remote, receiver| {
let receiver = receiver.unwrap();
let track_remote = track_remote.unwrap();
let peer = weak.upgrade().unwrap();
Box::pin(async move {
let id = &track_remote.stream_id().await;
if let Some(res) = peer.remote_provided.read().await.get(id) {
info!("track for ({:?}) '{:?}'", res.id, res.label);
peer.inst
.event_handler
.resource_connected(
peer.clone(),
res,
TransportChannel::Track(track_remote),
)
.await;
} else {
warn!("got unassociated track; stopping receiver");
receiver.stop().await.unwrap();
}
})
}))
}
{
let weak = Arc::<Peer>::downgrade(&peer);
peer.peer_connection.on_data_channel(Box::new(move |dc| {
let peer = weak.upgrade().unwrap();
Box::pin(async move {
if let Some(res) = peer
.remote_provided
.read()
.await
.get(&dc.label().to_string())
{
info!("data channel for ({:?}) '{:?}'", res.id, res.label);
peer.inst
.event_handler
.resource_connected(
peer.clone(),
res,
TransportChannel::DataChannel(dc),
)
.await;
} else {
warn!("got unassociated data channel; closed connection");
dc.close().await.unwrap();
}
})
}))
}
peer
}
pub async fn init_remote(&self) {
self.send_relay(RelayMessage::Identify {
username: self.inst.config.username.clone(),
})
.await;
for res in self.inst.local_resources.read().await.values() {
self.send_relay(RelayMessage::Provide(res.info())).await;
}
}
pub async fn request_resource(&self, id: String) {
self.send_relay(RelayMessage::Request { id }).await;
}
pub async fn request_stop_resource(&self, id: String) {
self.send_relay(RelayMessage::RequestStop { id }).await;
}
pub async fn send_relay(&self, inner: RelayMessage) {
self.inst.send_relay(Some(self.id), inner).await
}
pub async fn on_relay(self: &Arc<Self>, p: RelayMessage) {
match p {
RelayMessage::Offer(o) => self.on_offer(o).await,
RelayMessage::Answer(a) => self.on_answer(a).await,
RelayMessage::IceCandidate(c) => self.on_remote_ice_candidate(c).await,
RelayMessage::Provide(info) => {
info!(
"remote resource provided: ({:?}) {:?} {:?}",
info.id, info.kind, info.label
);
self.remote_provided
.write()
.await
.insert(info.id.clone(), info.clone());
self.inst
.event_handler
.resource_added(self.clone(), info)
.await;
}
RelayMessage::ProvideStop { id } => {
info!("remote resource removed: ({:?}) ", id);
self.remote_provided.write().await.remove(&id);
self.inst
.event_handler
.resource_removed(self.clone(), id)
.await;
}
RelayMessage::Chat(_) => (),
RelayMessage::Identify { username } => {
info!("peer {} is known as {username:?}", self.id)
}
RelayMessage::Request { id } => {
if let Some(res) = self.inst.local_resources.read().await.get(&id) {
res.on_request(self.clone()).await;
} else {
warn!("({}) requested unknown local resource", self.id)
}
}
RelayMessage::RequestStop { id: _ } => {} // TODO
}
}
pub async fn on_leave(&self) {
info!("({}) peer left", self.id);
}
pub async fn on_ice_candidate(&self, candidate: RTCIceCandidate) {
debug!("publishing local ICE candidate");
self.send_relay(RelayMessage::IceCandidate(candidate.to_json().unwrap()))
.await;
}
pub async fn on_remote_ice_candidate(&self, candidate: RTCIceCandidateInit) {
debug!("adding remote ICE candidate");
self.peer_connection
.add_ice_candidate(candidate)
.await
.unwrap();
}
pub async fn on_negotiation_needed(self: Arc<Self>) {
info!("({}) negotiation needed", self.id);
self.offer().await
}
pub async fn offer(&self) {
info!("({}) sending offer", self.id);
let offer = self.peer_connection.create_offer(None).await.unwrap();
self.peer_connection
.set_local_description(offer.clone())
.await
.unwrap();
self.send_relay(protocol::RelayMessage::Offer(offer.sdp))
.await
}
pub async fn on_offer(&self, offer: Sdp) {
info!("({}) received offer", self.id);
let offer = RTCSessionDescription::offer(offer).unwrap();
self.peer_connection
.set_remote_description(offer)
.await
.unwrap();
self.answer().await
}
pub async fn answer(&self) {
info!("({}) sending answer", self.id);
let offer = self.peer_connection.create_answer(None).await.unwrap();
self.peer_connection
.set_local_description(offer.clone())
.await
.unwrap();
self.send_relay(protocol::RelayMessage::Answer(offer.sdp))
.await
}
pub async fn on_answer(&self, answer: Sdp) {
info!("({}) received answer", self.id);
let offer = RTCSessionDescription::answer(answer).unwrap();
self.peer_connection
.set_remote_description(offer)
.await
.unwrap();
}
}
|
