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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 std::fmt::Debug;
use std::marker::PhantomData;
use thiserror::Error;
use tokio::net::TcpStream;
pub struct Connection<R: ProtocolPacket, W: ProtocolPacket> {
/// The buffered writer
pub stream: TcpStream,
pub compression_threshold: Option<u32>,
pub enc_cipher: Option<Aes128CfbEnc>,
pub dec_cipher: Option<Aes128CfbDec>,
_reading: PhantomData<R>,
_writing: PhantomData<W>,
}
impl<R, W> Connection<R, W>
where
R: ProtocolPacket + Debug,
W: ProtocolPacket + Debug,
{
pub async fn read(&mut self) -> Result<R, ReadPacketError> {
read_packet::<R, _>(
&mut self.stream,
self.compression_threshold,
&mut self.dec_cipher,
)
.await
}
/// Write a packet to the server
pub async fn write(&mut self, packet: W) -> std::io::Result<()> {
write_packet(
packet,
&mut self.stream,
self.compression_threshold,
&mut self.enc_cipher,
)
.await
}
}
#[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)?;
Ok(Connection {
stream,
compression_threshold: None,
enc_cipher: None,
dec_cipher: None,
_reading: PhantomData,
_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 0 or less, compression is disabled
if threshold > 0 {
self.compression_threshold = Some(threshold as u32);
} else {
self.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.enc_cipher = Some(enc_cipher);
self.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 {
stream: connection.stream,
compression_threshold: connection.compression_threshold,
enc_cipher: connection.enc_cipher,
dec_cipher: connection.dec_cipher,
_reading: PhantomData,
_writing: PhantomData,
}
}
}
|
