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client_api: allow player to connect before match has started

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This commit is contained in:
Ilion Beyst 2022-09-09 21:56:11 +02:00
parent d68731a114
commit 8eeb81bd5a
1 changed files with 134 additions and 41 deletions
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175
planetwars-server/src/modules/client_api.rs
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@ -33,10 +33,26 @@ pub struct ClientApiServer {
router: PlayerRouter,
}
type ClientMessages = Streaming<pb::PlayerApiClientMessage>;
type ServerMessages = mpsc::UnboundedReceiver<Result<pb::PlayerApiServerMessage, Status>>;
enum PlayerConnectionState {
Reserved,
ClientConnected {
tx: oneshot::Sender<ServerMessages>,
client_messages: ClientMessages,
},
ServerConnected {
tx: oneshot::Sender<ClientMessages>,
server_messages: ServerMessages,
},
// In connected state, the connection is removed from the PlayerRouter
}
/// Routes players to their handler
#[derive(Clone)]
struct PlayerRouter {
routing_table: Arc<Mutex<HashMap<String, SyncThingData>>>,
routing_table: Arc<Mutex<HashMap<String, PlayerConnectionState>>>,
}
impl PlayerRouter {
@ -55,12 +71,12 @@ impl Default for PlayerRouter {
// TODO: implement a way to expire entries
impl PlayerRouter {
fn put(&self, player_key: String, entry: SyncThingData) {
fn put(&self, player_key: String, entry: PlayerConnectionState) {
let mut routing_table = self.routing_table.lock().unwrap();
routing_table.insert(player_key, entry);
}
fn take(&self, player_key: &str) -> Option<SyncThingData> {
fn take(&self, player_key: &str) -> Option<PlayerConnectionState> {
// TODO: this design does not allow for reconnects. Is this desired?
let mut routing_table = self.routing_table.lock().unwrap();
routing_table.remove(player_key)
@ -81,21 +97,62 @@ impl pb::client_api_service_server::ClientApiService for ClientApiServer {
.get("player_key")
.ok_or_else(|| Status::unauthenticated("no player_key provided"))?;
let player_key_str = player_key
let player_key_string = player_key
.to_str()
.map_err(|_| Status::invalid_argument("unreadable string"))?;
.map_err(|_| Status::invalid_argument("unreadable string"))?
.to_string();
let sync_data = self
.router
.take(player_key_str)
.ok_or_else(|| Status::not_found("player_key not found"))?;
let client_messages = req.into_inner();
let stream = req.into_inner();
enum ConnState {
Connected {
server_messages: ServerMessages,
},
Awaiting {
rx: oneshot::Receiver<ServerMessages>,
},
}
sync_data.tx.send(stream).unwrap();
Ok(Response::new(UnboundedReceiverStream::new(
sync_data.server_messages,
)))
let conn_state = {
// during this block, a lack is held on the routing table
let mut routing_table = self.router.routing_table.lock().unwrap();
let connection_state = routing_table
.remove(&player_key_string)
.ok_or_else(|| Status::not_found("player_key not found"))?;
match connection_state {
PlayerConnectionState::Reserved => {
let (tx, rx) = oneshot::channel();
routing_table.insert(
player_key_string,
PlayerConnectionState::ClientConnected {
tx,
client_messages,
},
);
ConnState::Awaiting { rx }
}
PlayerConnectionState::ServerConnected {
tx,
server_messages,
} => {
tx.send(client_messages).unwrap();
ConnState::Connected { server_messages }
}
PlayerConnectionState::ClientConnected { .. } => panic!("player already connected"),
}
};
let server_messages = match conn_state {
ConnState::Connected { server_messages } => server_messages,
ConnState::Awaiting { rx } => rx
.await
.map_err(|_| Status::internal("failed to connect player to game"))?,
};
Ok(Response::new(UnboundedReceiverStream::new(server_messages)))
}
async fn create_match(
@ -119,6 +176,9 @@ impl pb::client_api_service_server::ClientApiService for ClientApiServer {
.map_err(|_| Status::not_found("map not found"))?;
let player_key = gen_alphanumeric(32);
// ensure that the player key is registered in the router when we send a response
self.router
.put(player_key.clone(), PlayerConnectionState::Reserved);
let remote_bot_spec = Box::new(RemoteBotSpec {
player_key: player_key.clone(),
@ -155,12 +215,6 @@ impl pb::client_api_service_server::ClientApiService for ClientApiServer {
}
}
// TODO: please rename me
struct SyncThingData {
tx: oneshot::Sender<Streaming<pb::PlayerApiClientMessage>>,
server_messages: mpsc::UnboundedReceiver<Result<pb::PlayerApiServerMessage, Status>>,
}
struct RemoteBotSpec {
player_key: String,
router: PlayerRouter,
@ -174,32 +228,71 @@ impl runner::BotSpec for RemoteBotSpec {
event_bus: Arc<Mutex<EventBus>>,
_match_logger: MatchLogger,
) -> Box<dyn PlayerHandle> {
let (tx, rx) = oneshot::channel();
let (server_msg_snd, server_msg_recv) = mpsc::unbounded_channel();
self.router.put(
self.player_key.clone(),
SyncThingData {
tx,
server_messages: server_msg_recv,
},
);
let fut = tokio::time::timeout(Duration::from_secs(10), rx);
match fut.await {
Ok(Ok(client_messages)) => {
// let client_messages = rx.await.unwrap();
tokio::spawn(handle_bot_messages(
player_id,
event_bus.clone(),
enum ConnState {
Connected {
client_messages: ClientMessages,
},
Awaiting {
rx: oneshot::Receiver<ClientMessages>,
},
}
let conn_state = {
// during this block, we hold a lock on the routing table.
let mut routing_table = self.router.routing_table.lock().unwrap();
let connection_state = routing_table
.remove(&self.player_key)
.expect("player key not found in routing table");
match connection_state {
PlayerConnectionState::Reserved => {
let (tx, rx) = oneshot::channel();
routing_table.insert(
self.player_key.clone(),
PlayerConnectionState::ServerConnected {
tx,
server_messages: server_msg_recv,
},
);
ConnState::Awaiting { rx }
}
PlayerConnectionState::ClientConnected {
tx,
client_messages,
));
}
_ => {
// ensure router cleanup
self.router.take(&self.player_key);
} => {
tx.send(server_msg_recv).unwrap();
ConnState::Connected { client_messages }
}
PlayerConnectionState::ServerConnected { .. } => panic!("server already connected"),
}
};
let maybe_client_messages = match conn_state {
ConnState::Connected { client_messages } => Some(client_messages),
ConnState::Awaiting { rx } => {
let fut = tokio::time::timeout(Duration::from_secs(10), rx);
match fut.await {
Ok(Ok(client_messages)) => Some(client_messages),
_ => {
// ensure router cleanup
self.router.take(&self.player_key);
None
}
}
}
};
if let Some(client_messages) = maybe_client_messages {
tokio::spawn(handle_bot_messages(
player_id,
event_bus.clone(),
client_messages,
));
}
// If the player did not connect, the receiving half of `sender`
// will be dropped here, resulting in a time-out for every turn.
// This is fine for now, but
@ -217,7 +310,7 @@ async fn handle_bot_messages(
event_bus: Arc<Mutex<EventBus>>,
mut messages: Streaming<pb::PlayerApiClientMessage>,
) {
// TODO: can this be writte nmore nicely?
// TODO: can this be written more nicely?
while let Some(message) = messages.message().await.unwrap() {
match message.client_message {
Some(pb::PlayerApiClientMessageType::Action(resp)) => {