From 14c163e415a8ad37d9111e6a5a4a34e3cbe0ad74 Mon Sep 17 00:00:00 2001
From: natrixaeria <janng@gmx.de>
Date: Sun, 19 May 2019 17:55:04 +0200
Subject: Rename gameserver module to server

---
 game_server/src/server.rs | 164 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 game_server/src/server.rs

(limited to 'game_server/src/server.rs')

diff --git a/game_server/src/server.rs b/game_server/src/server.rs
new file mode 100644
index 0000000..a4b1ed5
--- /dev/null
+++ b/game_server/src/server.rs
@@ -0,0 +1,164 @@
+use websocket::{OwnedMessage,
+    sync::Server,
+    client::sync::Client,
+    server::{NoTlsAcceptor, InvalidConnection,
+        sync::AcceptResult}};
+use std::net::{SocketAddr, ToSocketAddrs, TcpStream};
+use std::sync::{mpsc,
+                mpsc::{Sender, Receiver},
+                Arc, Mutex};
+use std::collections::HashMap;
+use super::lobby::Lobby;
+use super::backend_connection::BackendConnection;
+
+const PROTOCOL: &str = "tuesday";
+
+pub type Token = u32;
+
+#[derive(Debug)]
+pub enum GameServerError {
+    BindError(std::io::Error),
+    HandshakeRequestError,
+    InvalidProtocolError,
+    AcceptError(std::io::Error)
+}
+
+pub struct GameServer {
+    addr: SocketAddr,
+    lobby: Lobby,
+    backend: Arc<Mutex<BackendConnection>>,
+    clients: Arc<Mutex<HashMap<Token, GameClient>>>,
+}
+
+pub struct GameClient {
+    addr: SocketAddr,
+    client: Client<TcpStream>,
+}
+
+impl GameClient {
+    fn from_raw(client: Client<TcpStream>) -> Result<Self, ()> {
+        let addr = client.peer_addr().map_err(|_| ())?;
+        info!("got a client connection from: {}", addr);
+        Ok(GameClient {
+            addr,
+            client,
+        })
+    }
+
+    fn require_token(&mut self) -> Option<Token> {
+        let message = self.client
+                 .recv_message()
+                 .ok()?;
+        if let OwnedMessage::Text(text) = message {
+            text.parse().ok()
+        } else {
+            None
+        }
+    }
+}
+
+type ClientConnection = Result<GameClient, GameServerError>;
+
+impl GameServer {
+    pub fn new<T: ToSocketAddrs>(addr: T) -> Self {
+        let addr = addr.to_socket_addrs().unwrap().next().unwrap();
+        debug!("ws address: {}", addr);
+        info!("create lobby");
+        let lobby = Lobby::new();
+        let backend = BackendConnection::new("https://kobert.dev");
+        info!("got a C# backend connection");
+        GameServer {
+            addr,
+            lobby,
+            backend: Arc::new(Mutex::new(backend)),
+            clients: Arc::new(Mutex::new(HashMap::new())),
+        }
+    }
+
+    pub fn run(&self) -> Result<(), GameServerError> {
+        let reader = self.read_clients();
+        loop {
+            let mut connection = reader.recv().unwrap()?;
+            self.add_client(connection);
+        }
+        Ok(())
+    }
+
+    fn add_client(&self, mut client: GameClient) {
+        let clients = Arc::clone(&self.clients);
+        let backend = Arc::clone(&self.backend);
+        std::thread::spawn(move || {
+            let token = client.require_token();
+            if let Some(token) = token {
+                println!("Token: {}", token);
+                let locked_backend = backend.lock().unwrap();
+                let result = locked_backend.validate_token(&token);
+                if let Err(err) = result {
+                    warn!("token {} is invalid: '{:?}'", token, err);
+                } else {
+                    clients.lock().unwrap().insert(token, client);
+                }
+            } else {
+                warn!("client sent invalid token");
+            }
+        });
+    }
+
+    fn read_clients(&self) -> Receiver<ClientConnection> {
+        let (s, r): (Sender<ClientConnection>, Receiver<ClientConnection>)
+                     = mpsc::channel();
+        let addr = self.addr;
+        std::thread::spawn(move || {
+            let result = Self::handle_requests(addr, &s).or_else(|e| s.send(Err(e)));
+        });
+        r
+    }
+
+    fn handle_requests(addr: SocketAddr, s: &Sender<ClientConnection>) -> Result<(), GameServerError> {
+        let server = match Server::<NoTlsAcceptor>::bind(addr) {
+            Ok(v) => v,
+            Err(e) => {
+                error!("websocket binding error");
+                Err(GameServerError::BindError(e))?
+            },
+        };
+        info!("webserver is being launched");
+        for req in server {
+            s.send(Ok(Self::handle_request(req)?)).unwrap();
+        }
+        info!("webserver is being shut down");
+        Ok(())
+    }
+
+    fn handle_request(req: AcceptResult<TcpStream>) -> ClientConnection {
+        match req {
+            Ok(req) => {
+                if !req.protocols().contains(&PROTOCOL.to_string()) {
+                    warn!("a client tried to connect without {} protocol", PROTOCOL);
+                    req.reject().unwrap();
+                    Err(GameServerError::InvalidProtocolError)
+                } else {
+                    match req.use_protocol(PROTOCOL).accept() {
+                        Ok(client) => {
+                            match GameClient::from_raw(client) {
+                                Ok(client) => Ok(client),
+                                Err(_) => {
+                                    error!("could not create a client");
+                                    Err(GameServerError::HandshakeRequestError)
+                                }
+                            }
+                        },
+                        Err((_, e)) => {
+                            warn!("client handshake failed");
+                            Err(GameServerError::AcceptError(e))
+                        }
+                    }
+                }
+            },
+            Err(e) => {
+                warn!("invalid client request");
+                Err(GameServerError::HandshakeRequestError)
+            }
+        }
+    }
+}
-- 
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