Added CLI for server commands.

client/src/main/java/nl/andrewlalis/aos_client/MessageTransceiver.java

@@ -4,10 +4,7 @@ import nl.andrewlalis.aos_core.model.World;
 import nl.andrewlalis.aos_core.net.*;
 import nl.andrewlalis.aos_core.net.chat.ChatMessage;
 
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-import java.io.StreamCorruptedException;
+import java.io.*;
 import java.net.Socket;
 import java.net.SocketException;
 
@@ -66,7 +63,7 @@ public class MessageTransceiver extends Thread {
 					World world = ((WorldUpdateMessage) msg).getWorld();
 					this.client.setWorld(world);
 				}
-			} catch (StreamCorruptedException e) {
+			} catch (StreamCorruptedException | EOFException e) {
 				e.printStackTrace();
 				this.running = false;
 			} catch (SocketException e) {

core/pom.xml

@@ -16,4 +16,14 @@
 		<maven.compiler.target>16</maven.compiler.target>
 	</properties>
 
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.8.1</version>
+			</plugin>
+		</plugins>
+	</build>
+
 </project>

core/src/main/java/nl/andrewlalis/aos_core/model/Player.java

@@ -5,7 +5,7 @@ import nl.andrewlalis.aos_core.model.tools.Gun;
 
 import java.util.Objects;
 
-public class Player extends PhysicsObject {
+public class Player extends PhysicsObject implements Comparable<Player> {
 	public static final double MOVEMENT_SPEED = 10; // Movement speed, in m/s
 	public static final double RADIUS = 0.5; // Collision radius, in meters.
 	public static final double RESUPPLY_COOLDOWN = 30; // Seconds between allowing resupply.
@@ -146,4 +146,11 @@ public class Player extends PhysicsObject {
 	public int hashCode() {
 		return Objects.hash(getId());
 	}
+
+	@Override
+	public int compareTo(Player o) {
+		int r = this.name.compareTo(o.getName());
+		if (r == 0) return Integer.compare(this.id, o.getId());
+		return r;
+	}
 }

server/src/main/java/nl/andrewlalis/aos_server/ClientHandler.java

@@ -1,6 +1,9 @@
 package nl.andrewlalis.aos_server;
 
-import nl.andrewlalis.aos_core.net.*;
+import nl.andrewlalis.aos_core.net.IdentMessage;
+import nl.andrewlalis.aos_core.net.Message;
+import nl.andrewlalis.aos_core.net.PlayerControlStateMessage;
+import nl.andrewlalis.aos_core.net.Type;
 import nl.andrewlalis.aos_core.net.chat.ChatMessage;
 
 import java.io.IOException;
@@ -10,6 +13,9 @@ import java.net.Socket;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
+/**
+ * Thread which handles communicating with a single client socket connection.
+ */
 public class ClientHandler extends Thread {
 	private final ExecutorService sendingQueue = Executors.newSingleThreadExecutor();
 	private final Server server;
@@ -34,6 +40,13 @@ public class ClientHandler extends Thread {
 
 	public void shutdown() {
 		this.running = false;
+		try {
+			this.in.close();
+			this.out.close();
+			this.socket.close();
+		} catch (IOException e) {
+			System.err.println("Could not close streams when shutting down client handler for player " + this.playerId + ": " + e.getMessage());
+		}
 	}
 
 	public void send(Message message) {

server/src/main/java/nl/andrewlalis/aos_server/Server.java

@@ -14,6 +14,7 @@ import java.awt.*;
 import java.io.IOException;
 import java.net.ServerSocket;
 import java.net.Socket;
+import java.net.SocketException;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Scanner;
@@ -27,10 +28,14 @@ public class Server {
 	private final ServerSocket serverSocket;
 	private final World world;
 	private final WorldUpdater worldUpdater;
+	private final ServerCli cli;
+
+	private volatile boolean running;
 
 	public Server(int port) throws IOException {
 		this.clientHandlers = new CopyOnWriteArrayList<>();
 		this.serverSocket = new ServerSocket(port);
+		this.cli = new ServerCli(this);
 
 		this.world = new World(new Vec2(50, 70));
 		world.getBarricades().add(new Barricade(10, 10, 30, 5));
@@ -58,11 +63,22 @@ public class Server {
 		System.out.println("Started AOS-Server TCP on port " + port);
 	}
 
-	public void acceptClientConnection() throws IOException {
-		Socket socket = this.serverSocket.accept();
-		var t = new ClientHandler(this, socket);
-		t.start();
-		this.clientHandlers.add(t);
+	public World getWorld() {
+		return world;
+	}
+
+	public void acceptClientConnection() {
+		try {
+			Socket socket = this.serverSocket.accept();
+			var t = new ClientHandler(this, socket);
+			t.start();
+			this.clientHandlers.add(t);
+		} catch (IOException e) {
+			if (e instanceof SocketException && !this.running && e.getMessage().equalsIgnoreCase("Socket closed")) {
+				return; // Ignore this exception, since it is expected on shutdown.
+			}
+			e.printStackTrace();
+		}
 	}
 
 	public int registerNewPlayer(String name, ClientHandler handler) {
@@ -105,6 +121,15 @@ public class Server {
 		System.out.println(message);
 	}
 
+	public void kickPlayer(Player player) {
+		for (ClientHandler handler : this.clientHandlers) {
+			if (handler.getPlayerId() == player.getId()) {
+				handler.shutdown();
+				return;
+			}
+		}
+	}
+
 	public void sendWorldToClients() {
 		for (ClientHandler handler : this.clientHandlers) {
 			handler.send(new WorldUpdateMessage(this.world));
@@ -167,6 +192,32 @@ public class Server {
 		}
 	}
 
+	public void shutdown() {
+		this.running = false;
+		try {
+			this.serverSocket.close();
+			for (ClientHandler handler : this.clientHandlers) {
+				handler.shutdown();
+			}
+		} catch (IOException e) {
+			System.err.println("Could not close server socket on shutdown: " + e.getMessage());
+		}
+	}
+
+	public void run() {
+		this.running = true;
+		this.worldUpdater.start();
+		this.cli.start();
+		while (this.running) {
+			this.acceptClientConnection();
+		}
+		System.out.println("Stopped accepting new client connections.");
+		this.worldUpdater.shutdown();
+		System.out.println("Stopped world updater.");
+		this.cli.shutdown();
+		System.out.println("Stopped CLI interface.");
+	}
+
 
 
 	public static void main(String[] args) throws IOException {
@@ -184,9 +235,6 @@ public class Server {
 		}
 
 		Server server = new Server(port);
-		server.worldUpdater.start();
-		while (true) {
-			server.acceptClientConnection();
-		}
+		server.run();
 	}
 }

server/src/main/java/nl/andrewlalis/aos_server/ServerCli.java

@@ -0,0 +1,65 @@
+package nl.andrewlalis.aos_server;
+
+import nl.andrewlalis.aos_server.command.*;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Command-line interface for issuing commands to the AOS server at runtime.
+ */
+public class ServerCli extends Thread {
+	private final Map<String, Command> commands = new HashMap<>();
+
+	private final BufferedReader reader;
+
+	private volatile boolean running;
+
+	public ServerCli(Server server) {
+		this.reader = new BufferedReader(new InputStreamReader(System.in));
+		this.commands.put("reset", new ResetCommand(server));
+		this.commands.put("help", new HelpCommand());
+		this.commands.put("stop", new StopCommand(server));
+
+		this.commands.put("list", new ListPlayersCommand(server));
+		this.commands.put("kick", new KickCommand(server));
+	}
+
+	public void shutdown() {
+		this.running = false;
+		try {
+			this.reader.close();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+	@Override
+	public void run() {
+		this.running = true;
+		String input;
+		System.out.println("Server command-line-interface initialized. Type \"help\" for more information.");
+		while (this.running) {
+			try {
+				input = reader.readLine();
+				String[] words = input.split("\\s+");
+				if (words.length == 0) continue;
+				String command = words[0].toLowerCase();
+				String[] args = Arrays.copyOfRange(words, 1, words.length);
+				Command cmd = this.commands.get(command);
+				if (cmd == null) {
+					System.out.println("Unknown command.");
+				} else {
+					cmd.execute(args);
+					if (command.equals("stop")) this.running = false; // Needed to exit and avoid a blocking read.
+				}
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+}

server/src/main/java/nl/andrewlalis/aos_server/command/Command.java

@@ -0,0 +1,5 @@
+package nl.andrewlalis.aos_server.command;
+
+public interface Command {
+	void execute(String[] args);
+}

server/src/main/java/nl/andrewlalis/aos_server/command/HelpCommand.java

@@ -0,0 +1,18 @@
+package nl.andrewlalis.aos_server.command;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+public class HelpCommand implements Command {
+	@Override
+	public void execute(String[] args) {
+		try {
+			InputStream is = HelpCommand.class.getClassLoader().getResourceAsStream("help.txt");
+			if (is == null) throw new IOException("Could not load help.txt.");
+			String helpMessage = new String(is.readAllBytes());
+			System.out.println(helpMessage);
+		} catch (IOException e) {
+			System.err.println("Could not load help information: " + e.getMessage());
+		}
+	}
+}

server/src/main/java/nl/andrewlalis/aos_server/command/KickCommand.java

@@ -0,0 +1,39 @@
+package nl.andrewlalis.aos_server.command;
+
+import nl.andrewlalis.aos_core.model.Player;
+import nl.andrewlalis.aos_server.Server;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class KickCommand implements Command {
+	private final Server server;
+
+	public KickCommand(Server server) {
+		this.server = server;
+	}
+
+	@Override
+	public void execute(String[] args) {
+		if (args.length < 1) {
+			System.out.println("Missing player id/name argument.");
+			return;
+		}
+		String query = args[0].trim();
+		List<Player> matchingPlayers = new ArrayList<>();
+		for (var p : this.server.getWorld().getPlayers().values()) {
+			if (Integer.toString(p.getId()).equals(query) || p.getName().equals(query)) {
+				matchingPlayers.add(p);
+			}
+		}
+		if (matchingPlayers.isEmpty()) {
+			System.out.println("No matching players found.");
+		} else if (matchingPlayers.size() > 1) {
+			System.out.println("More than one matching player found.");
+		} else {
+			Player player = matchingPlayers.get(0);
+			this.server.kickPlayer(player);
+			System.out.println("Kicked player " + player.getName() + ".");
+		}
+	}
+}

server/src/main/java/nl/andrewlalis/aos_server/command/ListPlayersCommand.java

@@ -0,0 +1,35 @@
+package nl.andrewlalis.aos_server.command;
+
+import nl.andrewlalis.aos_core.model.Player;
+import nl.andrewlalis.aos_server.Server;
+
+import java.util.stream.Collectors;
+
+public class ListPlayersCommand implements Command {
+	private final Server server;
+
+	public ListPlayersCommand(Server server) {
+		this.server = server;
+	}
+
+	@Override
+	public void execute(String[] args) {
+		if (this.server.getWorld().getPlayers().isEmpty()) {
+			System.out.println("There are no players currently online.");
+			return;
+		}
+		String message = this.server.getWorld().getPlayers().values().stream()
+			.sorted()
+			.map(player -> String.format(
+				"%d | %s   Team: %s, Health: %.1f / %.1f, Gun: %s",
+				player.getId(),
+				player.getName(),
+				player.getTeam() == null ? "none" : player.getTeam().getName(),
+				player.getHealth(),
+				Player.MAX_HEALTH,
+				player.getGun().getType().name()
+			))
+			.collect(Collectors.joining("\n"));
+		System.out.println(message);
+	}
+}

server/src/main/java/nl/andrewlalis/aos_server/command/ResetCommand.java

@@ -0,0 +1,17 @@
+package nl.andrewlalis.aos_server.command;
+
+import nl.andrewlalis.aos_server.Server;
+
+public class ResetCommand implements Command {
+	private final Server server;
+
+	public ResetCommand(Server server) {
+		this.server = server;
+	}
+
+	@Override
+	public void execute(String[] args) {
+		this.server.resetGame();
+		System.out.println("Reset the game.");
+	}
+}

server/src/main/java/nl/andrewlalis/aos_server/command/StopCommand.java

@@ -0,0 +1,16 @@
+package nl.andrewlalis.aos_server.command;
+
+import nl.andrewlalis.aos_server.Server;
+
+public class StopCommand implements Command {
+	private final Server server;
+
+	public StopCommand(Server server) {
+		this.server = server;
+	}
+
+	@Override
+	public void execute(String[] args) {
+		this.server.shutdown();
+	}
+}

server/src/main/resources/help.txt

@@ -0,0 +1,16 @@
+Ace of Shades - Server CLI Help
+-------------------------------
+
+This command-line interface is used to issue commands while the server is
+running, to change the state of the game or configuration options, without
+having to restart.
+
+The following commands are available:
+
+stop            Stops the server, disconnecting all clients.
+reset           Resets the server by respawning all players and resets scores.
+help            Shows this help message.
+
+list            Show a list of all connected players.
+kick <p>        Kick a player with the given id or name. If more than one player
+                exists with a given name, you need to use their unique id.