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connection_worker.rs
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250 lines (217 loc) · 7.16 KB
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use std::{fmt::Debug, io, net::SocketAddr, sync::Arc, time::Duration};
use base::Text;
use flume::{Receiver, Sender};
use futures_lite::FutureExt;
use io::ErrorKind;
use protocol::{
codec::CryptKey, packets::server::Disconnect, ClientPlayPacket, MinecraftCodec, Readable,
ServerPlayPacket, Writeable,
};
use tokio::{
io::{AsyncReadExt, AsyncWriteExt},
net::{
tcp::{OwnedReadHalf, OwnedWriteHalf},
TcpStream,
},
time::timeout,
};
use crate::{
initial_handler::{InitialHandling, NewPlayer},
options::Options,
player_count::PlayerCount,
};
/// Tokio task which handles a connection and processes
/// packets.
///
/// # Lifecycle
/// * A connection is made, and the `Listener` spawns a `Worker`.
/// * Connection goes through initial handling, i.e., the handshake process.
/// * If the connection was not a status ping, then the main server thread
/// is notified of the new connection via a channel.
pub struct Worker {
reader: Reader,
writer: Writer,
options: Arc<Options>,
player_count: PlayerCount,
packets_to_send_tx: Sender<ServerPlayPacket>,
received_packets_rx: Receiver<ClientPlayPacket>,
new_players: Sender<NewPlayer>,
}
impl Worker {
pub fn new(
stream: TcpStream,
_addr: SocketAddr,
options: Arc<Options>,
player_count: PlayerCount,
new_players: Sender<NewPlayer>,
) -> Self {
let (reader, writer) = stream.into_split();
let (received_packets_tx, received_packets_rx) = flume::bounded(32);
let (packets_to_send_tx, packets_to_send_rx) = flume::unbounded();
let reader = Reader::new(reader, received_packets_tx);
let writer = Writer::new(writer, packets_to_send_rx);
Self {
reader,
writer,
options,
player_count,
packets_to_send_tx,
received_packets_rx,
new_players,
}
}
pub fn start(self) {
tokio::task::spawn(async move {
self.run().await;
});
}
async fn run(mut self) {
let result = crate::initial_handler::handle(&mut self).await;
match result {
Ok(result) => self.proceed(result).await,
Err(e) => log::debug!("Initial handling failed: {:?}", e),
}
}
async fn proceed(mut self, result: InitialHandling) {
match result {
InitialHandling::Disconnect => (),
InitialHandling::Join(new_player) => {
if self.player_count.try_add_player().is_err() {
self.write(ServerPlayPacket::Disconnect(Disconnect {
reason: Text::from("The server is full!").to_string(),
}))
.await
.ok();
return;
}
let username = new_player.username.clone();
let _ = self.new_players.send_async(new_player).await;
self.split(username);
}
}
}
pub fn options(&self) -> &Options {
&self.options
}
pub fn player_count(&self) -> u32 {
self.player_count.get()
}
#[allow(unused)]
pub fn enable_compression(&mut self, threshold: usize) {
self.reader.codec.enable_compression(threshold);
self.writer.codec.enable_compression(threshold);
log::debug!("Enabled compression");
}
pub fn enable_encryption(&mut self, key: CryptKey) {
self.reader.codec.enable_encryption(key);
self.writer.codec.enable_encryption(key);
log::debug!("Enabled encryption");
}
pub async fn read<P: Readable>(&mut self) -> anyhow::Result<P> {
self.reader.read().await
}
pub async fn write(&mut self, packet: impl Writeable + Debug) -> anyhow::Result<()> {
self.writer.write(packet).await
}
pub fn split(self, username: String) {
let Self {
reader,
writer,
player_count,
..
} = self;
let reader = tokio::task::spawn(async move { reader.run().await });
let writer = tokio::task::spawn(async move { writer.run().await });
tokio::task::spawn(async move {
let result = reader.race(writer).await.expect("task panicked");
if let Err(e) = result {
let message = disconnected_message(e);
log::debug!("{} lost connection: {}", username, message);
}
player_count.remove_player();
});
}
pub fn packets_to_send(&self) -> Sender<ServerPlayPacket> {
self.packets_to_send_tx.clone()
}
pub fn received_packets(&self) -> Receiver<ClientPlayPacket> {
self.received_packets_rx.clone()
}
}
struct Reader {
stream: OwnedReadHalf,
codec: MinecraftCodec,
buffer: [u8; 512],
received_packets: Sender<ClientPlayPacket>,
}
impl Reader {
pub fn new(stream: OwnedReadHalf, received_packets: Sender<ClientPlayPacket>) -> Self {
Self {
stream,
codec: MinecraftCodec::new(),
buffer: [0; 512],
received_packets,
}
}
pub async fn run(mut self) -> anyhow::Result<()> {
loop {
let packet = self.read::<ClientPlayPacket>().await?;
let result = self.received_packets.send_async(packet).await;
if result.is_err() {
// server dropped connection
return Ok(());
}
}
}
pub async fn read<P: Readable>(&mut self) -> anyhow::Result<P> {
// Keep reading bytes and trying to get the packet.
loop {
if let Some(packet) = self.codec.next_packet::<P>()? {
return Ok(packet);
}
let duration = Duration::from_secs(10);
let read_bytes = timeout(duration, self.stream.read(&mut self.buffer)).await??;
if read_bytes == 0 {
return Err(io::Error::new(ErrorKind::UnexpectedEof, "read 0 bytes").into());
}
let bytes = &self.buffer[..read_bytes];
self.codec.accept(bytes);
}
}
}
struct Writer {
stream: OwnedWriteHalf,
codec: MinecraftCodec,
packets_to_send: Receiver<ServerPlayPacket>,
buffer: Vec<u8>,
}
impl Writer {
pub fn new(stream: OwnedWriteHalf, packets_to_send: Receiver<ServerPlayPacket>) -> Self {
Self {
stream,
codec: MinecraftCodec::new(),
packets_to_send,
buffer: Vec::new(),
}
}
pub async fn run(mut self) -> anyhow::Result<()> {
while let Ok(packet) = self.packets_to_send.recv_async().await {
self.write(packet).await?;
}
Ok(())
}
pub async fn write(&mut self, packet: impl Writeable + Debug) -> anyhow::Result<()> {
self.codec.encode(&packet, &mut self.buffer)?;
self.stream.write_all(&self.buffer).await?;
self.buffer.clear();
Ok(())
}
}
fn disconnected_message(e: anyhow::Error) -> String {
if let Some(io_error) = e.downcast_ref::<io::Error>() {
if io_error.kind() == ErrorKind::UnexpectedEof {
return "disconnected".to_owned();
}
}
format!("{:?}", e)
}