Pre login event is now async

src/main/java/net/minestom/server/entity/EntityManager.java

@@ -4,8 +4,8 @@ import com.google.common.collect.Queues;
 import net.minestom.server.MinecraftServer;
 import net.minestom.server.chat.ChatColor;
 import net.minestom.server.chat.ColoredText;
+import net.minestom.server.event.player.AsyncPlayerPreLoginEvent;
 import net.minestom.server.event.player.PlayerLoginEvent;
-import net.minestom.server.event.player.PlayerPreLoginEvent;
 import net.minestom.server.instance.Instance;
 import net.minestom.server.network.ConnectionManager;
 import net.minestom.server.network.packet.server.play.KeepAlivePacket;
@@ -15,6 +15,7 @@ import org.jetbrains.annotations.NotNull;
 
 import java.util.Queue;
 import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
 import java.util.function.Consumer;
 
 public final class EntityManager {
@@ -74,7 +75,7 @@ public final class EntityManager {
     }
 
     /**
-     * Calls the player initialization callbacks and the event {@link PlayerPreLoginEvent}.
+     * Calls the player initialization callbacks and the event {@link AsyncPlayerPreLoginEvent}.
      * If the {@link Player} hasn't been kicked, add him to the waiting list.
      * <p>
      * Can be considered as a pre-init thing,
@@ -89,22 +90,27 @@ public final class EntityManager {
             playerInitialization.accept(player);
         }
 
+        CompletableFuture.runAsync(() -> {
             // Call pre login event
-        PlayerPreLoginEvent playerPreLoginEvent = new PlayerPreLoginEvent(player, player.getUsername(), player.getUuid());
-        player.callEvent(PlayerPreLoginEvent.class, playerPreLoginEvent);
+            AsyncPlayerPreLoginEvent asyncPlayerPreLoginEvent = new AsyncPlayerPreLoginEvent(player, player.getUsername(), player.getUuid());
+            player.callEvent(AsyncPlayerPreLoginEvent.class, asyncPlayerPreLoginEvent);
 
             // Ignore the player if he has been disconnected (kick)
             final boolean online = player.isOnline();
             if (!online)
                 return;
 
-        // Add him to the list and change his username/uuid if changed
-        this.waitingPlayers.add(player);
-
-        final String username = playerPreLoginEvent.getUsername();
-        final UUID uuid = playerPreLoginEvent.getPlayerUuid();
+            // Change UUID/Username based on the event
+            {
+                final String username = asyncPlayerPreLoginEvent.getUsername();
+                final UUID uuid = asyncPlayerPreLoginEvent.getPlayerUuid();
 
                 player.setUsername(username);
                 player.setUuid(uuid);
             }
+
+            // Add the player to the waiting list
+            this.waitingPlayers.add(player);
+        });
+    }
 }

src/main/java/net/minestom/server/entity/Player.java

@@ -1286,7 +1286,7 @@ public class Player extends LivingEntity implements CommandSender {
     }
 
     /**
-     * Changes the internal player name, used for the {@link PlayerPreLoginEvent}
+     * Changes the internal player name, used for the {@link AsyncPlayerPreLoginEvent}
      * mostly unsafe outside of it.
      *
      * @param username the new player name

src/main/java/net/minestom/server/event/player/AsyncPlayerPreLoginEvent.java

@@ -11,12 +11,12 @@ import java.util.UUID;
  * Called before the player initialization, it can be used to kick the player before any connection
  * or to change his final username/uuid.
  */
-public class PlayerPreLoginEvent extends PlayerEvent {
+public class AsyncPlayerPreLoginEvent extends PlayerEvent {
 
     private String username;
     private UUID playerUuid;
 
-    public PlayerPreLoginEvent(@NotNull Player player, @NotNull String username, @NotNull UUID playerUuid) {
+    public AsyncPlayerPreLoginEvent(@NotNull Player player, @NotNull String username, @NotNull UUID playerUuid) {
         super(player);
         this.username = username;
         this.playerUuid = playerUuid;

src/main/java/net/minestom/server/network/ConnectionManager.java

@@ -7,6 +7,7 @@ import net.minestom.server.chat.ColoredText;
 import net.minestom.server.chat.JsonMessage;
 import net.minestom.server.entity.Player;
 import net.minestom.server.entity.fakeplayer.FakePlayer;
+import net.minestom.server.event.player.AsyncPlayerPreLoginEvent;
 import net.minestom.server.listener.manager.ClientPacketConsumer;
 import net.minestom.server.listener.manager.ServerPacketConsumer;
 import net.minestom.server.network.packet.client.login.LoginStartPacket;
@@ -255,7 +256,7 @@ public final class ConnectionManager {
      * This callback should be exclusively used to add event listeners since it is called directly after a
      * player join (before any chunk is sent) and the client behavior can therefore be unpredictable.
      * You can add your "init" code in {@link net.minestom.server.event.player.PlayerLoginEvent}
-     * or even {@link net.minestom.server.event.player.PlayerPreLoginEvent}.
+     * or even {@link AsyncPlayerPreLoginEvent}.
      *
      * @param playerInitialization the {@link Player} initialization consumer
      */