New packet handeling system
This commit is contained in:
parent
942c726b95
commit
69a7f37518
67
examples/ping_pong.rs
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67
examples/ping_pong.rs
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@ -0,0 +1,67 @@
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use bevnet::{
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client::{ClientAppExt, ClientPlugin, ServerConnection},
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server::{ClientListener, ServerAppExt, ServerPlugin},
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};
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use bevy::prelude::*;
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use serde::{Deserialize, Serialize};
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#[derive(Serialize, Deserialize)]
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struct Ping;
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#[derive(Serialize, Deserialize)]
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struct Pong;
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fn start_server(mut commands: Commands, keys: Res<Input<KeyCode>>) {
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if keys.just_pressed(KeyCode::B) {
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println!("Starting server...");
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match ClientListener::bind("127.0.0.1:8000") {
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Ok(listener) => {
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commands.insert_resource(listener);
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println!("Server started");
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}
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Err(e) => println!("Failed to start server: {}", e),
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}
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}
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}
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fn connect(mut commands: Commands, keys: Res<Input<KeyCode>>) {
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if keys.just_pressed(KeyCode::C) {
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println!("Connecting to server...");
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match ServerConnection::connect("127.0.0.1:8000") {
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Ok(connection) => {
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commands.insert_resource(connection);
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println!("Connected to server");
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}
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Err(e) => println!("Failed to connect: {}", e),
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}
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}
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}
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fn send_ping(connection: Option<Res<ServerConnection>>, keys: Res<Input<KeyCode>>) {
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if keys.just_pressed(KeyCode::S) {
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println!("Sending ping...");
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if let Some(connection) = connection {
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connection.send(Ping);
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println!("Ping sent");
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}
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}
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}
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fn main() {
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App::new()
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.add_plugins(DefaultPlugins)
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.add_plugin(ServerPlugin)
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.add_system(start_server)
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.add_server_packet_handler::<Ping, _>(|entity, connection, _, _| {
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println!("Received ping from {:?}", entity);
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connection.send(Pong);
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println!("Sent pong to {:?}", entity);
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})
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.add_plugin(ClientPlugin)
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.add_system(connect)
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.add_client_packet_handler::<Pong, _>(|_, _| {
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println!("Received pong");
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})
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.add_system(send_ping)
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.run();
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}
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103
src/client.rs
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103
src/client.rs
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@ -0,0 +1,103 @@
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use std::{collections::HashMap, io, net::ToSocketAddrs, sync::Arc};
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use bevy::prelude::*;
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use crate::{tcp::Connection, Packet};
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/// A function that handle a received [Packet] on the client.
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pub type ClientPacketHandler = Box<dyn Fn(Vec<u8>, &mut World) + Send + Sync>;
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/// A Bevy resource that store the packets handlers for the client.
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#[derive(Resource)]
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pub struct ClientHandlerManager(Arc<HashMap<u64, ClientPacketHandler>>);
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/// A connection to a remote server.
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#[derive(Resource)]
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pub struct ServerConnection(Connection);
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impl ServerConnection {
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/// Connects to a remote server.
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pub fn connect<A: ToSocketAddrs>(addr: A) -> io::Result<Self> {
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Ok(Self(Connection::connect(addr)?))
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}
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/// Sends a packet through this connection.
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pub fn send<P: Packet>(&self, packet: P) {
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let mut data = bincode::serialize(&packet).expect("Failed to serialize packet");
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data.extend(P::packet_id().to_be_bytes());
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self.0.send(data);
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}
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}
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/// A plugin that manage the network connections for a server.
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pub struct ClientPlugin;
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impl ClientPlugin {
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/// Handles a received [Packet] on the server.
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pub fn handle_packets(world: &mut World) {
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// Get all received packets
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let mut packets = Vec::new();
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if let Some(connection) = world.get_resource::<ServerConnection>() {
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while let Some(mut packet) = connection.0.recv() {
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if packet.len() < 8 {
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println!("Invalid packet received: {:?}", packet);
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} else {
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let id_buffer = packet.split_off(packet.len() - 8);
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let packet_id = u64::from_be_bytes(id_buffer.try_into().unwrap());
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packets.push((packet_id, packet));
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}
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}
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} else {
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return;
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}
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// Get the packet handlers
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let handlers = Arc::clone(&world.resource_mut::<ClientHandlerManager>().0);
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// Handle all received packets
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for (packet_id, packet) in packets {
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if let Some(handler) = handlers.get(&packet_id) {
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handler(packet, world);
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}
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}
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}
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/// Remove [ServerConnection] if it's disconnected.
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pub fn remove_disconnected(mut commands: Commands, connection: Option<Res<ServerConnection>>) {
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if let Some(connection) = connection {
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if connection.0.closed() {
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commands.remove_resource::<ServerConnection>();
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}
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}
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}
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}
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impl Plugin for ClientPlugin {
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fn build(&self, app: &mut App) {
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app.insert_resource(ClientHandlerManager(Arc::new(HashMap::new())));
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app.add_system(ClientPlugin::handle_packets);
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app.add_system(ClientPlugin::remove_disconnected);
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}
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}
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/// An extension to add packet handlers.
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pub trait ClientAppExt {
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/// Add a new packet handler.
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fn add_client_packet_handler<P, H>(&mut self, handler: H) -> &mut Self
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where
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P: Packet,
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H: Fn(Vec<u8>, &mut World) + Send + Sync + 'static;
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}
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impl ClientAppExt for App {
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fn add_client_packet_handler<P, H>(&mut self, handler: H) -> &mut Self
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where
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P: Packet,
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H: Fn(Vec<u8>, &mut World) + Send + Sync + 'static,
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{
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Arc::get_mut(&mut self.world.resource_mut::<ClientHandlerManager>().0)
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.unwrap()
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.insert(P::packet_id(), Box::new(handler));
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self
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}
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}
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31
src/lib.rs
31
src/lib.rs
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use bevy::{prelude::*, utils::HashMap};
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use serde::{de::DeserializeOwned, Serialize};
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use std::{
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collections::hash_map::DefaultHasher,
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hash::{Hash, Hasher},
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};
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pub mod client;
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pub mod server;
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mod tcp;
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/// A packet that can be sent over a [Connection].
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pub trait Packet: DeserializeOwned + Serialize + Send + Sync {
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/// Returns a unique identifier for this packet.
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///
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/// This function uses [std::any::type_name] to get a string
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/// representation of the type of the object and returns the
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/// hash of that string. This is not perfect... but I didn't
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/// find a better solution.
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fn packet_id() -> u64 {
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let mut hasher = DefaultHasher::new();
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std::any::type_name::<Self>().hash(&mut hasher);
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hasher.finish()
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}
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}
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impl<T: DeserializeOwned + Serialize + Send + Sync> Packet for T {}
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/* use bevy::{prelude::*, utils::HashMap};
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use std::{
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io::{self, ErrorKind},
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net::{TcpStream, ToSocketAddrs},
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loop {
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match receiver.try_recv() {
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Ok(packet) => {
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println!("YESSSS");
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packets.push((entity, ClientConnection(Arc::clone(&connection.0)), packet));
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}
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Err(TryRecvError::Empty) => break,
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self
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}
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}
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*/
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127
src/server.rs
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127
src/server.rs
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use crate::{
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tcp::{Connection, Listener},
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Packet,
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};
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use bevy::prelude::*;
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use std::{collections::HashMap, io, net::ToSocketAddrs, sync::Arc};
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/// A function that handle a received [Packet] on the server.
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pub type ServerPacketHandler =
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Box<dyn Fn(Entity, ClientConnection, Vec<u8>, &mut World) + Send + Sync>;
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/// A Bevy resource that store the packets handlers for the server.
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#[derive(Resource)]
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pub struct ServerHandlerManager(Arc<HashMap<u64, ServerPacketHandler>>);
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/// A Bevy resource that listens for incoming [ClientConnection]s.
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#[derive(Resource)]
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pub struct ClientListener(Listener);
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impl ClientListener {
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/// Creates a new listener on the given address.
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pub fn bind<A: ToSocketAddrs>(addr: A) -> io::Result<Self> {
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Ok(Self(Listener::bind(addr)?))
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}
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}
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/// A connection to a remote client.
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#[derive(Component)]
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pub struct ClientConnection(Arc<Connection>);
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impl ClientConnection {
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/// Sends a packet through this connection.
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pub fn send<P: Packet>(&self, packet: P) {
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let mut data = bincode::serialize(&packet).expect("Failed to serialize packet");
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data.extend(P::packet_id().to_be_bytes());
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self.0.send(data);
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}
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}
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/// A plugin that manage the network connections for a server.
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pub struct ServerPlugin;
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impl ServerPlugin {
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/// Accept new [ClientConnection]s.
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pub fn accept_connections(mut commands: Commands, listener: Option<Res<ClientListener>>) {
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if let Some(listener) = listener {
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if let Some(connection) = listener.0.accept() {
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commands.spawn(ClientConnection(Arc::new(connection)));
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}
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}
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}
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/// Handles a received [Packet] on the server.
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pub fn handle_packets(world: &mut World) {
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// Get all received packets
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let mut packets = Vec::new();
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for (entity, connection) in world.query::<(Entity, &ClientConnection)>().iter(world) {
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while let Some(mut packet) = connection.0.recv() {
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if packet.len() < 8 {
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println!("Invalid packet received: {:?}", packet);
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} else {
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let id_buffer = packet.split_off(packet.len() - 8);
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let packet_id = u64::from_be_bytes(id_buffer.try_into().unwrap());
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packets.push((
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entity,
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ClientConnection(Arc::clone(&connection.0)),
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packet_id,
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packet,
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));
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}
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}
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}
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// Get the packet handlers
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let handlers = Arc::clone(&world.resource_mut::<ServerHandlerManager>().0);
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// Handle all received packets
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for (entity, connection, packet_id, packet) in packets {
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if let Some(handler) = handlers.get(&packet_id) {
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handler(entity, connection, packet, world);
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}
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}
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}
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/// Remove disconnected [ClientConnection]s.
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pub fn remove_disconnected(
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mut commands: Commands,
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connections: Query<(Entity, &ClientConnection)>,
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) {
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for (entity, connection) in connections.iter() {
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if connection.0.closed() {
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commands.entity(entity).remove::<ClientConnection>();
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}
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}
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}
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}
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impl Plugin for ServerPlugin {
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fn build(&self, app: &mut App) {
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app.insert_resource(ServerHandlerManager(Arc::new(HashMap::new())));
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app.add_system(ServerPlugin::accept_connections);
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app.add_system(ServerPlugin::handle_packets);
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app.add_system(ServerPlugin::remove_disconnected);
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}
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}
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/// An extension to add packet handlers.
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pub trait ServerAppExt {
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/// Add a new packet handler.
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fn add_server_packet_handler<P, H>(&mut self, handler: H) -> &mut Self
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where
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P: Packet,
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H: Fn(Entity, ClientConnection, Vec<u8>, &mut World) + Send + Sync + 'static;
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}
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impl ServerAppExt for App {
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fn add_server_packet_handler<P, H>(&mut self, handler: H) -> &mut Self
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where
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P: Packet,
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H: Fn(Entity, ClientConnection, Vec<u8>, &mut World) + Send + Sync + 'static,
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{
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Arc::get_mut(&mut self.world.resource_mut::<ServerHandlerManager>().0)
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.unwrap()
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.insert(P::packet_id(), Box::new(handler));
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self
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}
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}
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183
src/tcp.rs
183
src/tcp.rs
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use serde::{de::DeserializeOwned, Serialize};
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use std::{
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collections::hash_map::DefaultHasher,
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hash::{Hash, Hasher},
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io::{self, ErrorKind, Read, Write},
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io::{self, Read, Write},
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net::{Shutdown, TcpListener, TcpStream, ToSocketAddrs},
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sync::{
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atomic::{AtomicBool, Ordering},
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mpsc::{channel, Receiver, Sender},
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Mutex, MutexGuard,
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Arc, Mutex,
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},
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thread,
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};
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/// A packet that can be sent over a [Connection].
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pub trait Packet: DeserializeOwned + Serialize + Send + Sync {
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/// Returns a unique identifier for this packet.
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///
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/// This function uses [std::any::type_name] to get a string
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/// representation of the type of the object and returns the
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/// hash of that string. This is not perfect... but I didn't
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/// find a better solution.
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fn packet_id() -> u64 {
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let mut hasher = DefaultHasher::new();
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std::any::type_name::<Self>().hash(&mut hasher);
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hasher.finish()
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}
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}
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impl<T: DeserializeOwned + Serialize + Send + Sync> Packet for T {}
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/// A raw packet.
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pub struct RawPacket {
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/// The identifier for this packet.
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packet_id: u64,
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/// The serialized packet.
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data: Vec<u8>,
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}
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impl RawPacket {
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/// Returns the identifier for this packet.
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pub fn packet_id(&self) -> u64 {
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self.packet_id
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}
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/// Deserializes this packet to the given [Packet] type.
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pub fn deserialize<P: Packet>(&self) -> Option<P> {
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bincode::deserialize(&self.data).ok()
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}
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}
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/// A TCP connection that can send and receive [Packet]s.
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/// A non-blocking TCP connection.
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pub struct Connection {
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/// The [TcpStream] of the connection.
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///
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/// It is used to send [Packet]s and to stop the receive
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/// thread when the [Connection] is dropped.
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stream: Mutex<TcpStream>,
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/// Track if the connection has been closed.
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closed: Arc<AtomicBool>,
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/// The [Receiver] of the received [RawPacket]s.
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receiver: Mutex<Receiver<RawPacket>>,
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/// The underlying TCP stream.
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stream: TcpStream,
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/// Used to receive packets from the receiving thread.
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receiver: Mutex<Receiver<Vec<u8>>>,
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/// Used to send packets to the sending thread.
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sender: Mutex<Sender<Vec<u8>>>,
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}
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impl Connection {
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/// Creates a new TCP connection.
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pub fn new(stream: TcpStream) -> io::Result<Self> {
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let (sender, receiver) = channel();
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/// Creates a new connection.
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fn new(stream: TcpStream) -> io::Result<Self> {
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stream.set_nonblocking(false)?;
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let closed = Arc::new(AtomicBool::new(false));
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// Spawn the receiving thread
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let thread_stream = stream.try_clone()?;
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thread::spawn(move || Self::receive_loop(thread_stream, sender));
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let (thread_sender, receiver) = channel();
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let thread_closed = Arc::clone(&closed);
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thread::spawn(move || Self::receiving_loop(thread_stream, thread_sender, thread_closed));
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// Spawn the sending thread
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let thread_stream = stream.try_clone()?;
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let (sender, thread_receiver) = channel();
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let thread_closed = Arc::clone(&closed);
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thread::spawn(move || Self::sending_loop(thread_stream, thread_receiver, thread_closed));
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// Return the connection
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Ok(Self {
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stream: Mutex::new(stream),
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closed,
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stream,
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receiver: Mutex::new(receiver),
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sender: Mutex::new(sender),
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})
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}
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/// The [Packet] receiving loop.
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fn receive_loop(mut stream: TcpStream, sender: Sender<RawPacket>) {
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/// Creates a new connection to the given address.
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pub fn connect<A: ToSocketAddrs>(addr: A) -> io::Result<Self> {
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Self::new(TcpStream::connect(addr)?)
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}
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/// The receiving loop for this connection.
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fn receiving_loop(mut stream: TcpStream, sender: Sender<Vec<u8>>, closed: Arc<AtomicBool>) {
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let mut len_buffer = [0; 4];
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let mut id_buffer = [0; 8];
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loop {
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// Read the length of the packet
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// Read the length of the next packet
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if stream.read_exact(&mut len_buffer).is_err() {
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return;
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break;
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}
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let packet_len = u32::from_le_bytes(len_buffer);
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let len = u32::from_be_bytes(len_buffer);
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// Read the packet identifier
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||||
if stream.read_exact(&mut id_buffer).is_err() {
|
||||
return;
|
||||
}
|
||||
let packet_id = u64::from_le_bytes(id_buffer);
|
||||
|
||||
// Read the packet data
|
||||
let mut data = vec![0; packet_len as usize];
|
||||
if stream.read_exact(&mut data).is_err() {
|
||||
return;
|
||||
// Read the packet
|
||||
let mut packet = vec![0; len as usize];
|
||||
if stream.read_exact(&mut packet).is_err() {
|
||||
break;
|
||||
}
|
||||
|
||||
// Store the packet
|
||||
if sender.send(RawPacket { packet_id, data }).is_err() {
|
||||
return;
|
||||
// Send the packet
|
||||
if sender.send(packet).is_err() {
|
||||
break;
|
||||
}
|
||||
}
|
||||
closed.store(true, Ordering::Relaxed);
|
||||
}
|
||||
|
||||
/// Sends a [Packet] over this connection.
|
||||
pub fn send<P: Packet>(&self, packet: P) -> io::Result<()> {
|
||||
let data = bincode::serialize(&packet).map_err(|e| io::Error::new(ErrorKind::Other, e))?;
|
||||
let mut stream = self
|
||||
.stream
|
||||
/// The sending loop for this connection.
|
||||
fn sending_loop(mut stream: TcpStream, receiver: Receiver<Vec<u8>>, closed: Arc<AtomicBool>) {
|
||||
loop {
|
||||
// Get the next packet to send
|
||||
let packet = match receiver.recv() {
|
||||
Ok(packet) => packet,
|
||||
Err(_) => break,
|
||||
};
|
||||
|
||||
// Send the length of the packet
|
||||
let len_buffer = u32::to_be_bytes(packet.len() as u32);
|
||||
if stream.write_all(&len_buffer).is_err() {
|
||||
break;
|
||||
}
|
||||
|
||||
// Send the packet
|
||||
if stream.write_all(&packet).is_err() {
|
||||
break;
|
||||
}
|
||||
}
|
||||
closed.store(true, Ordering::Relaxed);
|
||||
}
|
||||
|
||||
/// Returns `true` if the connection has been closed.
|
||||
pub fn closed(&self) -> bool {
|
||||
self.closed.load(Ordering::Relaxed)
|
||||
}
|
||||
|
||||
/// Returns the next received packet.
|
||||
pub fn recv(&self) -> Option<Vec<u8>> {
|
||||
self.receiver
|
||||
.lock()
|
||||
.map_err(|_| io::Error::new(ErrorKind::Other, "Failed to lock stream"))?;
|
||||
stream.write_all(&data.len().to_le_bytes())?;
|
||||
stream.write_all(&P::packet_id().to_le_bytes())?;
|
||||
stream.write_all(&data)
|
||||
.ok()
|
||||
.and_then(|receiver| receiver.try_recv().ok())
|
||||
}
|
||||
|
||||
/// Gets the [RawPacket] receiver of this connection.
|
||||
pub fn recv(&self) -> Option<MutexGuard<Receiver<RawPacket>>> {
|
||||
self.receiver.lock().ok()
|
||||
/// Sends a packet through this connection.
|
||||
pub fn send(&self, packet: Vec<u8>) {
|
||||
self.sender.lock().map(|sender| sender.send(packet)).ok();
|
||||
}
|
||||
}
|
||||
|
||||
impl Drop for Connection {
|
||||
fn drop(&mut self) {
|
||||
self.stream
|
||||
.lock()
|
||||
.map(|stream| stream.shutdown(Shutdown::Both))
|
||||
.ok();
|
||||
self.stream.shutdown(Shutdown::Both).ok();
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -145,9 +143,10 @@ impl Listener {
|
|||
}
|
||||
|
||||
/// Accepts a new [Connection].
|
||||
pub fn accept(&self) -> io::Result<Connection> {
|
||||
pub fn accept(&self) -> Option<Connection> {
|
||||
self.listener
|
||||
.accept()
|
||||
.and_then(|(stream, _)| Connection::new(stream))
|
||||
.ok()
|
||||
}
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue