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//! Component responsible for the [`peer::Component`] creating and removing.
use std::{cell::RefCell, collections::HashMap, rc::Rc, time::Duration};
use futures::{channel::mpsc, future};
use medea_client_api_proto::{self as proto, PeerId};
use medea_macro::watchers;
use medea_reactive::ObservableHashMap;
use tracerr::Traced;
use crate::{
connection::Connections,
media::{LocalTracksConstraints, MediaManager, RecvConstraints},
peer::{self, RtcPeerConnectionError},
platform,
utils::{
component, AsProtoState, SynchronizableState, TaskHandle,
Updatable as _,
},
};
use super::{PeerConnection, PeerEvent};
/// Component responsible for the [`peer::Component`] creating and removing.
pub type Component = component::Component<State, Repository>;
impl Component {
/// Returns [`PeerConnection`] stored in the repository by its ID.
#[must_use]
pub fn get(&self, id: PeerId) -> Option<Rc<PeerConnection>> {
self.peers.borrow().get(&id).map(component::Component::obj)
}
/// Returns all [`PeerConnection`]s stored in the repository.
#[must_use]
pub fn get_all(&self) -> Vec<Rc<PeerConnection>> {
self.peers
.borrow()
.values()
.map(component::Component::obj)
.collect()
}
/// Notifies all [`peer::Component`]s about a RPC connection loss.
pub fn connection_lost(&self) {
for peer in self.peers.borrow().values() {
peer.state().connection_lost();
}
}
/// Notifies all [`peer::Component`]s about a RPC connection restore.
pub fn connection_recovered(&self) {
for peer in self.peers.borrow().values() {
peer.state().connection_recovered();
}
}
/// Updates this [`State`] with the provided [`proto::state::Room`].
pub fn apply(&self, new_state: proto::state::Room) {
let state = self.state();
let send_cons = &self.obj().send_constraints;
state.0.borrow_mut().remove_not_present(&new_state.peers);
for (id, peer_state) in new_state.peers {
let peer = state.0.borrow().get(&id).cloned();
if let Some(p) = peer {
p.apply(peer_state, send_cons);
} else {
drop(state.0.borrow_mut().insert(
id,
Rc::new(peer::State::from_proto(peer_state, send_cons)),
));
}
}
}
}
/// State of the [`Component`].
#[derive(Debug, Default)]
pub struct State(RefCell<ObservableHashMap<PeerId, Rc<peer::State>>>);
/// Context of the [`Component`].
#[derive(Debug)]
pub struct Repository {
/// [`MediaManager`] for injecting into new created [`PeerConnection`]s.
media_manager: Rc<MediaManager>,
/// Peer id to [`PeerConnection`],
peers: Rc<RefCell<HashMap<PeerId, peer::Component>>>,
/// [`TaskHandle`] for a task which will call
/// [`PeerConnection::send_peer_stats`] of all [`PeerConnection`]s
/// every second and send updated [`PeerMetrics::RtcStats`] to the server.
///
/// [`PeerMetrics::RtcStats`]:
/// medea_client_api_proto::PeerMetrics::RtcStats
_stats_scrape_task: TaskHandle,
/// Channel for sending events produced by [`PeerConnection`] to [`Room`].
///
/// [`Room`]: crate::room::Room
peer_event_sender: mpsc::UnboundedSender<PeerEvent>,
/// Constraints to local [`local::Track`]s that are being published by
/// [`PeerConnection`]s from this [`Repository`].
///
/// [`Room`]: crate::room::Room
/// [`local::Track`]: crate::media::track::local::Track
send_constraints: LocalTracksConstraints,
/// Collection of [`Connection`]s with a remote `Member`s.
///
/// [`Connection`]: crate::connection::Connection
connections: Rc<Connections>,
/// Constraints to the [`remote::Track`] received by [`PeerConnection`]s
/// from this [`Repository`].
///
/// Used to disable or enable media receiving.
///
/// [`remote::Track`]: crate::media::track::remote::Track
recv_constraints: Rc<RecvConstraints>,
}
impl Repository {
/// Returns new empty [`platform::RtcStats`].
///
/// Spawns a task for scraping [`platform::RtcStats`].
#[must_use]
pub fn new(
media_manager: Rc<MediaManager>,
peer_event_sender: mpsc::UnboundedSender<PeerEvent>,
send_constraints: LocalTracksConstraints,
recv_constraints: Rc<RecvConstraints>,
connections: Rc<Connections>,
) -> Self {
let peers = Rc::default();
Self {
media_manager,
_stats_scrape_task: Self::spawn_peers_stats_scrape_task(Rc::clone(
&peers,
)),
peers,
peer_event_sender,
send_constraints,
recv_constraints,
connections,
}
}
/// Spawns a task which will call [`PeerConnection::send_peer_stats()`] of
/// all [`PeerConnection`]s every second and send updated
/// [`platform::RtcStats`] to a server.
///
/// Returns [`TaskHandle`] which will stop this task on its [`Drop`].
fn spawn_peers_stats_scrape_task(
peers: Rc<RefCell<HashMap<PeerId, peer::Component>>>,
) -> TaskHandle {
let (fut, abort) = future::abortable(async move {
loop {
platform::delay_for(Duration::from_secs(1)).await;
let peers = peers
.borrow()
.values()
.map(component::Component::obj)
.collect::<Vec<_>>();
drop(
future::join_all(
peers.iter().map(|p| p.scrape_and_send_peer_stats()),
)
.await,
);
}
});
platform::spawn(async move {
_ = fut.await.ok();
});
abort.into()
}
}
impl State {
/// Inserts the provided [`peer::State`].
pub fn insert(&self, peer_id: PeerId, peer_state: peer::State) {
drop(self.0.borrow_mut().insert(peer_id, Rc::new(peer_state)));
}
/// Lookups [`peer::State`] by the provided [`PeerId`].
#[must_use]
pub fn get(&self, peer_id: PeerId) -> Option<Rc<peer::State>> {
self.0.borrow().get(&peer_id).cloned()
}
/// Removes [`peer::State`] with the provided [`PeerId`].
pub fn remove(&self, peer_id: PeerId) {
drop(self.0.borrow_mut().remove(&peer_id));
}
}
impl AsProtoState for State {
type Output = proto::state::Room;
fn as_proto(&self) -> Self::Output {
Self::Output {
peers: self
.0
.borrow()
.iter()
.map(|(id, p)| (*id, p.as_proto()))
.collect(),
}
}
}
#[watchers]
impl Component {
/// Watches for new [`peer::State`] insertions.
///
/// Creates new [`peer::Component`] based on the inserted [`peer::State`].
#[watch(self.0.borrow().on_insert())]
async fn peer_added(
peers: Rc<Repository>,
_: Rc<State>,
(peer_id, new_peer): (PeerId, Rc<peer::State>),
) -> Result<(), Traced<RtcPeerConnectionError>> {
let peer = peer::Component::new(
PeerConnection::new(
&new_peer,
peers.peer_event_sender.clone(),
Rc::clone(&peers.media_manager),
peers.send_constraints.clone(),
Rc::clone(&peers.connections),
Rc::clone(&peers.recv_constraints),
)
.await
.map_err(tracerr::map_from_and_wrap!())?,
new_peer,
);
drop(peers.peers.borrow_mut().insert(peer_id, peer));
Ok(())
}
/// Watches for [`peer::State`] removal.
///
/// Removes [`peer::Component`] and closes [`Connection`] by calling
/// [`Connections::close_connection()`].
///
/// [`Connection`]: crate::connection::Connection
#[watch(self.0.borrow().on_remove())]
fn peer_removed(
peers: &Repository,
_: &State,
(peer_id, peer): (PeerId, Rc<peer::State>),
) {
drop(peers.peers.borrow_mut().remove(&peer_id));
for t in peer.get_recv_tracks() {
peers.connections.remove_track(&t);
}
for t in peer.get_send_tracks() {
peers.connections.remove_track(&t);
}
}
}