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+colog = "1.3.0" +futures = "0.3.31" +log = "0.4.27" +matchbox_protocol = "0.12.0" +matchbox_signaling = "0.12.0" +tokio = { version = "1.45.1", features = ["macros"] } diff --git a/manhunt-signaling/main.rs b/manhunt-signaling/main.rs new file mode 100644 index 0000000..c8176f1 --- /dev/null +++ b/manhunt-signaling/main.rs @@ -0,0 +1,336 @@ +use async_trait::async_trait; +use axum::{ + Error as AxumError, + extract::{Path, ws::Message}, + http::StatusCode, + response::IntoResponse, + routing::get, +}; +use futures::StreamExt; +use log::{debug, error, info, warn}; +use matchbox_protocol::{JsonPeerEvent, PeerId, PeerRequest}; +use matchbox_signaling::{ + ClientRequestError, NoCallbacks, SignalingError, SignalingServerBuilder, SignalingState, + SignalingTopology, WsStateMeta, + common_logic::{self, StateObj, parse_request}, +}; + +use anyhow::Context; +use std::{ + collections::{HashMap, HashSet}, + net::{IpAddr, Ipv4Addr, SocketAddr}, + result::Result as StdResult, +}; +use tokio::sync::mpsc::UnboundedSender; + +type Result = StdResult; + +type RoomId = String; +type Sender = UnboundedSender>; + +#[derive(Debug, Clone)] +struct Match { + pub open_lobby: bool, + pub players: HashSet, +} + +#[derive(Debug, Clone)] +struct Peer { + pub room: RoomId, + sender: Sender, +} + +impl Match { + pub fn new() -> Self { + Self { + open_lobby: true, + players: HashSet::with_capacity(10), + } + } +} + +#[derive(Default, Debug, Clone)] +struct ServerState { + waiting_clients: StateObj>, + queued_clients: StateObj>, + matches: StateObj>, + clients: StateObj>, +} + +impl SignalingState for ServerState {} + +impl ServerState { + fn add_client(&mut self, origin: SocketAddr, code: RoomId) { + self.waiting_clients + .lock() + .unwrap() + .insert(origin, code.clone()); + } + + pub fn room_is_open(&self, room_id: RoomId) -> bool { + self.matches + .lock() + .unwrap() + .get(&room_id) + .is_some_and(|m| m.open_lobby) + } + + /// Mark a match as started, disallowing others from joining + pub fn mark_started(&mut self, room: &RoomId) { + if let Some(mat) = self.matches.lock().unwrap().get_mut(room) { + mat.open_lobby = false; + } + } + + /// Create a new room with the given code, should be called when someone wants to host a game. + /// Returns false if a room with that code already exists. + pub fn create_room(&mut self, origin: SocketAddr, code: RoomId) -> bool { + let mut matches = self.matches.lock().unwrap(); + if matches.contains_key(&code) { + false + } else { + matches.insert(code.clone(), Match::new()); + drop(matches); + self.add_client(origin, code); + true + } + } + + /// Try to join a room by a code, returns `true` if successful + pub fn try_join_room(&mut self, origin: SocketAddr, code: RoomId) -> bool { + if self + .matches + .lock() + .unwrap() + .get(&code) + .is_some_and(|m| m.open_lobby) + { + self.waiting_clients.lock().unwrap().insert(origin, code); + true + } else { + false + } + } + + /// Assign a peer an id + pub fn assign_peer_id(&mut self, origin: SocketAddr, peer_id: PeerId) { + let target_room = self + .waiting_clients + .lock() + .unwrap() + .remove(&origin) + .expect("origin not waiting?"); + + self.queued_clients + .lock() + .unwrap() + .insert(peer_id, target_room); + } + + /// Add a peer to a room, returns other peers in the match currently + pub fn add_peer(&mut self, peer_id: PeerId, sender: Sender) -> Vec { + let target_room = self + .queued_clients + .lock() + .unwrap() + .remove(&peer_id) + .expect("peer not waiting?"); + let mut matches = self.matches.lock().unwrap(); + let mat = matches.get_mut(&target_room).expect("Room not found?"); + let peers = mat.players.iter().copied().collect::>(); + mat.players.insert(peer_id); + drop(matches); + let peer = Peer { + room: target_room, + sender, + }; + self.clients.lock().unwrap().insert(peer_id, peer); + peers + } + + /// Disconnect a peer from a room. Automatically deletes the room if no peers remain. Returns + /// the removed peer and the set of other peers in the room that need to be notified + pub fn remove_peer(&mut self, peer_id: PeerId) -> Option> { + let removed_peer = self.clients.lock().unwrap().remove(&peer_id)?; + let other_peers = self + .matches + .lock() + .unwrap() + .get_mut(&removed_peer.room) + .map(|m| { + m.players.remove(&peer_id); + m.players.iter().copied().collect::>() + }) + .unwrap_or_default(); + + if other_peers.is_empty() { + self.matches.lock().unwrap().remove(&removed_peer.room); + } + + Some(other_peers) + } + + pub fn try_send(&self, peer: PeerId, msg: Message) -> Result<(), SignalingError> { + self.clients + .lock() + .unwrap() + .get(&peer) + .ok_or(SignalingError::UnknownPeer) + .and_then(|peer| common_logic::try_send(&peer.sender, msg)) + } +} + +#[derive(Default, Debug)] +struct ServerTopology; + +#[async_trait] +impl SignalingTopology for ServerTopology { + async fn state_machine(upgrade: WsStateMeta) { + let WsStateMeta { + peer_id, + sender, + mut receiver, + mut state, + .. + } = upgrade; + + let other_peers = state.add_peer(peer_id, sender.clone()); + + let msg = Message::Text(JsonPeerEvent::NewPeer(peer_id).to_string().into()); + + for other_id in other_peers { + if let Err(why) = state.try_send(other_id, msg.clone()) { + error!("Failed to publish new peer event to {other_id}: {why:?}"); + } + } + + while let Some(req) = receiver.next().await { + let req = match parse_request(req) { + Ok(req) => req, + Err(e) => match e { + ClientRequestError::Axum(e) => { + warn!("Peer {peer_id} encountered Axum error: {e:?}. Disconnecting..."); + break; + } + ClientRequestError::Close => { + info!("Peer {peer_id} closed connection"); + break; + } + ClientRequestError::Json(_) | ClientRequestError::UnsupportedType(_) => { + error!("Error parsing request from {peer_id}: {e:?}"); + continue; // Recoverable, although may mean bad state? + } + }, + }; + + if let PeerRequest::Signal { receiver, data } = req { + let msg = Message::Text( + JsonPeerEvent::Signal { + sender: peer_id, + data, + } + .to_string() + .into(), + ); + if let Err(why) = state.try_send(receiver, msg) { + error!("Error sending signaling message from {peer_id} to {receiver}: {why:?}"); + } + } // Other variant, PeerRequest::KeepAlive is just for a heartbeat, do nothing + } + + info!("Peer {peer_id} disconnected"); + + let msg = Message::Text(JsonPeerEvent::PeerLeft(peer_id).to_string().into()); + if let Some(other_peers) = state.remove_peer(peer_id) { + for other_id in other_peers { + if let Err(why) = state.try_send(other_id, msg.clone()) { + warn!("Failed to alert {other_id} that {peer_id} has disconnected: {why:?}"); + } + } + } else { + warn!("Trying to remove peer {peer_id}, which doesn't exist?"); + } + } +} + +#[tokio::main] +async fn main() -> Result { + colog::init(); + + let args = std::env::args().collect::>(); + let socket_addr = args + .get(1) + .map(|raw_binding| raw_binding.parse::()) + .transpose() + .context("Invalid socket addr passed")? + .unwrap_or(SocketAddr::new(IpAddr::V4(Ipv4Addr::UNSPECIFIED), 3536)); + + let mut state = ServerState::default(); + + let server = SignalingServerBuilder::new(socket_addr, ServerTopology, state.clone()) + .on_connection_request({ + let mut state = state.clone(); + move |connection| { + info!("{} is requesting to connect", connection.origin); + debug!("Connection meta: {connection:?}"); + + let err = if let Some(room_code) = connection.path.clone() { + let is_host = connection.query_params.contains_key("create"); + if is_host { + if state.create_room(connection.origin, room_code) { + None + } else { + Some(StatusCode::CONFLICT) + } + } else if state.try_join_room(connection.origin, room_code) { + None + } else { + Some(StatusCode::NOT_FOUND) + } + } else { + Some(StatusCode::BAD_REQUEST) + }; + + if let Some(status) = err { + Err(status.into_response()) + } else { + Ok(true) + } + } + }) + .mutate_router({ + let state = state.clone(); + move |router| { + let mut state2 = state.clone(); + router + .route( + "/room_exists/{id}", + get(move |Path(room_id): Path| async move { + if state.room_is_open(room_id) { + StatusCode::OK + } else { + StatusCode::NOT_FOUND + } + }), + ) + .route( + "/mark_started/{id}", + get(move |Path(room_id): Path| async move { + state2.mark_started(&room_id); + StatusCode::OK + }), + ) + } + }) + .on_id_assignment({ + move |(socket, id)| { + info!("Assigning id {id} to {socket}"); + state.assign_peer_id(socket, id); + } + }) + .build(); + + info!("Starting manhunt signaling server {}", env!("CARGO_PKG_VERSION")); + + server.serve().await.context("Error while running server") +} -- 2.51.2