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|
use std::{net::SocketAddr, sync::Arc};
use azalea_entity::{LocalEntity, indexing::EntityUuidIndex};
use azalea_protocol::{
ServerAddress,
connect::{Connection, ConnectionError, Proxy},
packets::{
ClientIntention, ConnectionProtocol, PROTOCOL_VERSION,
handshake::ServerboundIntention,
login::{ClientboundLoginPacket, ServerboundHello, ServerboundLoginPacket},
},
};
use azalea_world::Instance;
use bevy_app::prelude::*;
use bevy_ecs::prelude::*;
use bevy_tasks::{IoTaskPool, Task, futures_lite::future};
use parking_lot::RwLock;
use tokio::sync::mpsc;
use tracing::{debug, warn};
use super::events::LocalPlayerEvents;
use crate::{
Account, JoinError, LocalPlayerBundle,
connection::RawConnection,
packet::login::{InLoginState, SendLoginPacketEvent},
};
/// A plugin that allows bots to join servers.
pub struct JoinPlugin;
impl Plugin for JoinPlugin {
fn build(&self, app: &mut App) {
app.add_event::<StartJoinServerEvent>().add_systems(
Update,
(handle_start_join_server_event, poll_create_connection_task),
);
}
}
#[derive(Event, Debug)]
pub struct StartJoinServerEvent {
pub account: Account,
pub address: ServerAddress,
pub resolved_address: SocketAddr,
pub proxy: Option<Proxy>,
pub event_sender: Option<mpsc::UnboundedSender<crate::Event>>,
pub start_join_callback_tx: Option<StartJoinCallback>,
}
// this is mpsc instead of oneshot so it can be cloned (since it's sent in an
// event)
#[derive(Component, Debug, Clone)]
pub struct StartJoinCallback(pub mpsc::UnboundedSender<Result<Entity, JoinError>>);
pub fn handle_start_join_server_event(
mut commands: Commands,
mut events: EventReader<StartJoinServerEvent>,
mut entity_uuid_index: ResMut<EntityUuidIndex>,
) {
for event in events.read() {
let uuid = event.account.uuid_or_offline();
let entity = if let Some(entity) = entity_uuid_index.get(&uuid) {
debug!("Reusing entity {entity:?} for client");
entity
} else {
let entity = commands.spawn_empty().id();
debug!("Created new entity {entity:?} for client");
// add to the uuid index
entity_uuid_index.insert(uuid, entity);
entity
};
let mut entity_mut = commands.entity(entity);
entity_mut.insert((
// add the Account to the entity now so plugins can access it earlier
event.account.to_owned(),
// localentity is always present for our clients, even if we're not actually logged
// in
LocalEntity,
// we don't insert InLoginState until we actually create the connection. note that
// there's no InHandshakeState component since we switch off of the handshake state
// immediately when the connection is created
));
if let Some(event_sender) = &event.event_sender {
// this is optional so we don't leak memory in case the user doesn't want to
// handle receiving packets
entity_mut.insert(LocalPlayerEvents(event_sender.clone()));
}
if let Some(start_join_callback) = &event.start_join_callback_tx {
entity_mut.insert(start_join_callback.clone());
}
let task_pool = IoTaskPool::get();
let resolved_addr = event.resolved_address;
let address = event.address.clone();
let proxy = event.proxy.clone();
let task = task_pool.spawn(async_compat::Compat::new(
create_conn_and_send_intention_packet(resolved_addr, address, proxy),
));
entity_mut.insert(CreateConnectionTask(task));
}
}
async fn create_conn_and_send_intention_packet(
resolved_addr: SocketAddr,
address: ServerAddress,
proxy: Option<Proxy>,
) -> Result<LoginConn, ConnectionError> {
let mut conn = if let Some(proxy) = proxy {
Connection::new_with_proxy(&resolved_addr, proxy).await?
} else {
Connection::new(&resolved_addr).await?
};
conn.write(ServerboundIntention {
protocol_version: PROTOCOL_VERSION,
hostname: address.host.clone(),
port: address.port,
intention: ClientIntention::Login,
})
.await?;
let conn = conn.login();
Ok(conn)
}
type LoginConn = Connection<ClientboundLoginPacket, ServerboundLoginPacket>;
#[derive(Component)]
pub struct CreateConnectionTask(pub Task<Result<LoginConn, ConnectionError>>);
pub fn poll_create_connection_task(
mut commands: Commands,
mut query: Query<(
Entity,
&mut CreateConnectionTask,
&Account,
Option<&StartJoinCallback>,
)>,
) {
for (entity, mut task, account, mut start_join_callback) in query.iter_mut() {
if let Some(poll_res) = future::block_on(future::poll_once(&mut task.0)) {
let mut entity_mut = commands.entity(entity);
entity_mut.remove::<CreateConnectionTask>();
let conn = match poll_res {
Ok(conn) => conn,
Err(err) => {
warn!("failed to create connection: {err}");
if let Some(cb) = start_join_callback.take() {
let _ = cb.0.send(Err(err.into()));
}
return;
}
};
let (read_conn, write_conn) = conn.into_split();
let (read_conn, write_conn) = (read_conn.raw, write_conn.raw);
let instance = Instance::default();
let instance_holder = crate::local_player::InstanceHolder::new(
entity,
// default to an empty world, it'll be set correctly later when we
// get the login packet
Arc::new(RwLock::new(instance)),
);
entity_mut.insert((
// these stay when we switch to the game state
LocalPlayerBundle {
raw_connection: RawConnection::new(
read_conn,
write_conn,
ConnectionProtocol::Login,
),
client_information: crate::ClientInformation::default(),
instance_holder,
metadata: azalea_entity::metadata::PlayerMetadataBundle::default(),
},
InLoginState,
));
commands.trigger(SendLoginPacketEvent::new(
entity,
ServerboundHello {
name: account.username.clone(),
profile_id: account.uuid_or_offline(),
},
));
if let Some(cb) = start_join_callback.take() {
let _ = cb.0.send(Ok(entity));
}
}
}
}
|
