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+[dependencies] +serde = { version = "1", features = ["derive"] } +rmp-serde = "1.1" \ No newline at end of file diff --git a/protocol/src/lib.rs b/protocol/src/lib.rs new file mode 100644 index 0000000..6caf186 --- /dev/null +++ b/protocol/src/lib.rs @@ -0,0 +1,51 @@ +use serde::{Serialize, Deserialize}; + +pub const PROTOCOL_VERSION: u32 = 1; + +#[derive(Serialize, Deserialize, Debug, Clone)] +pub enum State { + Handshake, + Play +} + +#[derive(Serialize, Deserialize, Debug, Clone)] +pub enum MessageC2S { + Hello { + version: u32, + requested_username: String, + next_state: State + }, + + Goodbye { + reason: GoodbyeReason + } +} + +#[derive(Serialize, Deserialize, Debug, Clone)] +pub enum MessageS2C { + Hello { + version: u32, + given_username: String, + next_state: State + }, + + Goodbye { + reason: GoodbyeReason + } +} + +#[derive(Serialize, Deserialize, Debug, Clone)] +pub enum GoodbyeReason { + UnsupportedProtocol { supported: u32, got: u32 }, + UnexpectedPacket, + UnexpectedNextState, + UsernameTaken, + Done +} + +pub fn pc2s(pkt: &MessageC2S) -> Vec { + rmp_serde::to_vec(pkt).unwrap() +} +pub fn ps2c(pkt: &MessageS2C) -> Vec { + rmp_serde::to_vec(pkt).unwrap() +} \ No newline at end of file diff --git a/server/Cargo.toml b/server/Cargo.toml index dd022ab..3c9f485 100644 --- a/server/Cargo.toml +++ b/server/Cargo.toml @@ -6,3 +6,13 @@ edition = "2021" # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html [dependencies] +tokio = { version = "1.27", features = ["macros", "sync", "rt-multi-thread"] } +serde = { version = "1", features = ["derive"] } +rmp-serde = { version = "1" } +futures = { version = "0.3", default-features = false } +hyper = { version = "0.14", features = ["server", "http1", "http2", "tcp"] } +tungstenite = { version = "0.18", default-features = false } +tokio-tungstenite = { version = "0.18" } +log = "0.4" +simple_logger = "4.1" +protocol = { version = "0.1.0", path = "../protocol" } \ No newline at end of file diff --git a/server/src/handler.rs b/server/src/handler.rs new file mode 100644 index 0000000..7fd75df --- /dev/null +++ b/server/src/handler.rs @@ -0,0 +1,21 @@ +use std::collections::HashMap; +use std::net::SocketAddr; +use std::sync::Arc; +use tokio::sync::mpsc::Sender; +use tokio::sync::RwLock; +use protocol::State; + +#[derive(Clone)] +pub struct ClientManager { + pub clients: Arc>>, + pub usernames: Arc>> +} + +#[derive(Clone)] +pub struct ClientHandler { + pub tx: Sender +} + +pub enum ClientHandlerMessage { + Tick +} \ No newline at end of file diff --git a/server/src/main.rs b/server/src/main.rs index e7a11a9..7530990 100644 --- a/server/src/main.rs +++ b/server/src/main.rs @@ -1,3 +1,133 @@ -fn main() { - println!("Hello, world!"); +use std::convert::Infallible; +use std::net::SocketAddr; +use std::sync::Arc; +use hyper::{header, upgrade, StatusCode, Body, Request, Response, Server, server::conn::AddrStream}; +use hyper::service::{make_service_fn, service_fn}; +use tokio_tungstenite::WebSocketStream; +use tungstenite::{handshake, Error}; +use futures::stream::StreamExt; +use log::{error, info}; +use tokio::sync::RwLock; +use protocol::State; +use crate::handler::{ClientData, ClientHandler, ClientManager}; +use crate::wsserver::handle_client; + +pub mod wsserver; +pub mod handler; +pub mod timer; + +async fn handle_request(mut request: Request, remote_addr: SocketAddr, mgr: ClientManager) -> Result, Infallible> { + match (request.uri().path(), request.headers().contains_key(header::UPGRADE)) { + //if the request is ws_echo and the request headers contains an Upgrade key + ("/ws", true) => { + //assume request is a handshake, so create the handshake response + let response = + match handshake::server::create_response_with_body(&request, || Body::empty()) { + Ok(response) => { + //in case the handshake response creation succeeds, + //spawn a task to handle the websocket connection + tokio::spawn(async move { + //using the hyper feature of upgrading a connection + match upgrade::on(&mut request).await { + //if successfully upgraded + Ok(upgraded) => { + //create a websocket stream from the upgraded object + let ws_stream = WebSocketStream::from_raw_socket( + //pass the upgraded object + //as the base layer stream of the Websocket + upgraded, + tokio_tungstenite::tungstenite::protocol::Role::Server, + None, + ).await; + + //we can split the stream into a sink and a stream + let (ws_write, ws_read) = ws_stream.split(); + + let (tx, rx) = tokio::sync::mpsc::channel(128); + + let client = ClientHandler { + tx, + }; + + // Acquire the write lock in a small scope, so it's dropped as quickly as possible + { + mgr.clients.write().await.insert(remote_addr, client); + } + + //forward the stream to the sink to achieve echo + match handle_client(mgr.clone(), remote_addr, rx, ws_write, ws_read).await { + Ok(_) => {}, + Err(e) => error!("error on WS connection {}: {}", remote_addr, e), + }; + + // clean up values left over + { + mgr.clients.write().await.remove(&remote_addr); + mgr.usernames.write().await.remove(&remote_addr); + } + }, + Err(e) => { + error!("error upgrading connection from {} to WS: {}", remote_addr, e); + } + } + }); + //return the response to the handshake request + response + }, + Err(e) => { + //probably the handshake request is not up to spec for websocket + error!("error creating websocket response to {}: {}", remote_addr, e); + let mut res = Response::new(Body::from(format!("Failed to create websocket: {}", e))); + *res.status_mut() = StatusCode::BAD_REQUEST; + return Ok(res); + } + }; + + Ok::<_, Infallible>(response) + }, + ("/ws", false) => { + Ok(Response::builder().status(400).body(Body::from("Connection-Upgrade header missing")).unwrap()) + }, + (url@_, false) => { + // typical HTTP file request + // TODO + Ok(Response::new(Body::empty())) + }, + (_, true) => { + // http upgrade on non-/ws endpoint + Ok(Response::builder().status(400).body(Body::from("Incorrect WebSocket endpoint")).unwrap()) + } + } } +#[tokio::main] +async fn main() { + simple_logger::init_with_env().expect("Unable to start logging service"); + + info!("Creating client handler"); + let mut mgr: ClientManager = ClientManager { + clients: Arc::new(RwLock::new(Default::default())), + }; + + let addr = SocketAddr::from(([127, 0, 0, 1], 3000)); + + info!("Listening on {} for HTTP/WebSocket connections", addr); + + let make_svc = make_service_fn(|conn: &AddrStream| { + let remote_addr = conn.remote_addr(); + + let mgr_for_this_thread = mgr.clone(); + async move { + Ok::<_, Infallible>(service_fn(move |request: Request| { + handle_request(request, remote_addr, mgr_for_this_thread) + })) + } + }); + + + + let server = Server::bind(&addr).serve(make_svc); + + if let Err(e) = server.await { + error!("error in server thread: {}", e); + } +} \ No newline at end of file diff --git a/server/src/timer.rs b/server/src/timer.rs new file mode 100644 index 0000000..73cbb34 --- /dev/null +++ b/server/src/timer.rs @@ -0,0 +1,21 @@ +use std::error::Error; +use std::time::Duration; +use log::error; +use tokio::sync::mpsc::Receiver; +use tokio::time::sleep; +use crate::handler::{ClientHandlerMessage, ClientManager}; + +pub async fn timer_main(mgr: ClientManager) { + loop { + sleep(Duration::from_millis(5)).await; + + for client_thread in mgr.clients.read().await.iter() { + match client_thread.tx.send(ClientHandlerMessage::Tick).await { + Ok(_) => (), + Err(e) => { + error!("unable to update a client thread: {}", e); + } + } + } + } +} \ No newline at end of file diff --git a/server/src/wsserver.rs b/server/src/wsserver.rs new file mode 100644 index 0000000..2985df7 --- /dev/null +++ b/server/src/wsserver.rs @@ -0,0 +1,106 @@ +use std::error::Error; +use std::net::SocketAddr; +use futures::stream::{SplitSink, SplitStream}; +use futures::{SinkExt, StreamExt}; +use hyper::upgrade::Upgraded; +use log::{error, info}; +use tokio::sync::mpsc::Receiver; +use tokio_tungstenite::WebSocketStream; +use tungstenite::Message; +use protocol::{GoodbyeReason, MessageC2S, MessageS2C, PROTOCOL_VERSION, ps2c, State}; +use crate::handler::{ClientHandler, ClientHandlerMessage, ClientManager}; + +pub async fn handle_client(mgr: ClientManager, remote_addr: SocketAddr, mut rx: Receiver, mut write: SplitSink, Message>, mut read: SplitStream>) -> Result<(), Box> { + let mut state = State::Handshake; + + loop { + if let Some(msg) = rx.recv().await { + match msg { + ClientHandlerMessage::Tick => {} // this intentionally does nothing + } + } else { + info!("channel closed, shutting down"); + break; + } + + if let Some(msg) = read.next().await { + let msg = msg?; + + if msg.is_binary() { + // try to deserialize the msg + let pkt: MessageC2S = rmp_serde::from_slice(&msg.into_data())?; + + match state { + State::Handshake => { + match pkt { + MessageC2S::Hello { version, requested_username, next_state } => { + if !matches!(next_state, State::Play) { + error!("client sent unexpected state {:?} (expected: Play)", next_state); + write.send(Message::from(ps2c(&MessageS2C::Goodbye { + reason: GoodbyeReason::UnexpectedNextState, + }))).await?; + break; + } + + // check version + if version != PROTOCOL_VERSION { + error!("client sent incompatible version {} (expected: {})", version, PROTOCOL_VERSION); + write.send(Message::from(ps2c(&MessageS2C::Goodbye { + reason: GoodbyeReason::UnsupportedProtocol { + supported: PROTOCOL_VERSION, + got: version, + }, + }))).await?; + break; + } + + // determine if we can give them that username + { + if mgr.usernames.read().await.values().into_iter().any(|u| *u == requested_username) { + error!("client requested username {} but it is in use", requested_username); + write.send(Message::from(ps2c(&MessageS2C::Goodbye { + reason: GoodbyeReason::UsernameTaken, + }))).await?; + break; + } + } + + // username is fine + { + mgr.usernames.write().await.insert(remote_addr, requested_username.clone()); + } + + write.send(Message::from(ps2c(&MessageS2C::Hello { + version, + given_username: requested_username, + next_state, + }))).await?; + }, + MessageC2S::Goodbye { reason } => { + info!("client sent goodbye: {:?}", reason); + break; + } + } + } + State::Play => { + match pkt { + MessageC2S::Hello { .. } => { + error!("client sent unexpected packet {:?} for state {:?}", pkt, state); + write.send(Message::from(ps2c(&MessageS2C::Goodbye { + reason: GoodbyeReason::UnexpectedPacket, + }))).await?; + break; + } + MessageC2S::Goodbye { reason } => { + info!("client sent goodbye: {:?}", reason); + break; + } + } + } + } + } + } + } + + Ok(()) +} \ No newline at end of file diff --git a/web/index.html b/web/index.html index 70a1810..65e5e57 100644 --- a/web/index.html +++ b/web/index.html @@ -7,7 +7,9 @@