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|
//! parse sending and receiving packets with a server.
use crate::packets::game::{ClientboundGamePacket, ServerboundGamePacket};
use crate::packets::handshake::{ClientboundHandshakePacket, ServerboundHandshakePacket};
use crate::packets::login::{ClientboundLoginPacket, ServerboundLoginPacket};
use crate::packets::status::{ClientboundStatusPacket, ServerboundStatusPacket};
use crate::packets::ProtocolPacket;
use crate::read::{read_packet, ReadPacketError};
use crate::write::write_packet;
use crate::ServerIpAddress;
use azalea_crypto::{Aes128CfbDec, Aes128CfbEnc};
use bytes::BytesMut;
use std::fmt::Debug;
use std::marker::PhantomData;
use thiserror::Error;
use tokio::net::tcp::{OwnedReadHalf, OwnedWriteHalf};
use tokio::net::TcpStream;
pub struct ReadConnection<R: ProtocolPacket> {
pub read_stream: OwnedReadHalf,
buffer: BytesMut,
pub compression_threshold: Option<u32>,
pub dec_cipher: Option<Aes128CfbDec>,
_reading: PhantomData<R>,
}
pub struct WriteConnection<W: ProtocolPacket> {
pub write_stream: OwnedWriteHalf,
pub compression_threshold: Option<u32>,
pub enc_cipher: Option<Aes128CfbEnc>,
_writing: PhantomData<W>,
}
pub struct Connection<R: ProtocolPacket, W: ProtocolPacket> {
pub reader: ReadConnection<R>,
pub writer: WriteConnection<W>,
}
impl<R> ReadConnection<R>
where
R: ProtocolPacket + Debug,
{
pub async fn read(&mut self) -> Result<R, ReadPacketError> {
read_packet::<R, _>(
&mut self.read_stream,
&mut self.buffer,
self.compression_threshold,
&mut self.dec_cipher,
)
.await
}
}
impl<W> WriteConnection<W>
where
W: ProtocolPacket + Debug,
{
/// Write a packet to the server
pub async fn write(&mut self, packet: W) -> std::io::Result<()> {
write_packet(
&packet,
&mut self.write_stream,
self.compression_threshold,
&mut self.enc_cipher,
)
.await
}
}
impl<R, W> Connection<R, W>
where
R: ProtocolPacket + Debug,
W: ProtocolPacket + Debug,
{
pub async fn read(&mut self) -> Result<R, ReadPacketError> {
self.reader.read().await
}
/// Write a packet to the server
pub async fn write(&mut self, packet: W) -> std::io::Result<()> {
self.writer.write(packet).await
}
/// Split the reader and writer into two objects. This doesn't allocate.
pub fn into_split(self) -> (ReadConnection<R>, WriteConnection<W>) {
(self.reader, self.writer)
}
}
#[derive(Error, Debug)]
pub enum ConnectionError {
#[error("{0}")]
Io(#[from] std::io::Error),
}
impl Connection<ClientboundHandshakePacket, ServerboundHandshakePacket> {
pub async fn new(address: &ServerIpAddress) -> Result<Self, ConnectionError> {
let ip = address.ip;
let port = address.port;
let stream = TcpStream::connect(format!("{}:{}", ip, port)).await?;
// enable tcp_nodelay
stream.set_nodelay(true)?;
let (read_stream, write_stream) = stream.into_split();
Ok(Connection {
reader: ReadConnection {
read_stream,
buffer: BytesMut::new(),
compression_threshold: None,
dec_cipher: None,
_reading: PhantomData,
},
writer: WriteConnection {
write_stream,
compression_threshold: None,
enc_cipher: None,
_writing: PhantomData,
},
})
}
pub fn login(self) -> Connection<ClientboundLoginPacket, ServerboundLoginPacket> {
Connection::from(self)
}
pub fn status(self) -> Connection<ClientboundStatusPacket, ServerboundStatusPacket> {
Connection::from(self)
}
}
impl Connection<ClientboundLoginPacket, ServerboundLoginPacket> {
pub fn set_compression_threshold(&mut self, threshold: i32) {
// if you pass a threshold of less than 0, compression is disabled
if threshold >= 0 {
self.reader.compression_threshold = Some(threshold as u32);
self.writer.compression_threshold = Some(threshold as u32);
} else {
self.reader.compression_threshold = None;
self.writer.compression_threshold = None;
}
}
pub fn set_encryption_key(&mut self, key: [u8; 16]) {
// minecraft has a cipher decoder and encoder, i don't think it matters though?
let (enc_cipher, dec_cipher) = azalea_crypto::create_cipher(&key);
self.writer.enc_cipher = Some(enc_cipher);
self.reader.dec_cipher = Some(dec_cipher);
}
pub fn game(self) -> Connection<ClientboundGamePacket, ServerboundGamePacket> {
Connection::from(self)
}
}
// rust doesn't let us implement From because allegedly it conflicts with
// `core`'s "impl<T> From<T> for T" so we do this instead
impl<R1, W1> Connection<R1, W1>
where
R1: ProtocolPacket + Debug,
W1: ProtocolPacket + Debug,
{
fn from<R2, W2>(connection: Connection<R1, W1>) -> Connection<R2, W2>
where
R2: ProtocolPacket + Debug,
W2: ProtocolPacket + Debug,
{
Connection {
reader: ReadConnection {
read_stream: connection.reader.read_stream,
buffer: connection.reader.buffer,
compression_threshold: connection.reader.compression_threshold,
dec_cipher: connection.reader.dec_cipher,
_reading: PhantomData,
},
writer: WriteConnection {
compression_threshold: connection.writer.compression_threshold,
write_stream: connection.writer.write_stream,
enc_cipher: connection.writer.enc_cipher,
_writing: PhantomData,
},
}
}
}
|
