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GeezerVison is showing github.com — feather/feather/server/src/connection_worker.rs at develop · aheart/feather Expand file tree/ Copy pathconnection_worker.rsMore file actions 250 lines (217 loc) · 7.16 KB / Copy pathconnection_worker.rsFile metadata and controls250 lines (217 loc) · 7.16 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 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) } |
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