From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 19 Apr 2020 04:28:29 -0400
Subject: [PATCH] Load Chunks for Login Asynchronously


diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -0,0 +0,0 @@ public class ChunkProviderServer extends IChunkProvider {
         return this.serverThreadQueue.executeNext();
     }
 
-    private boolean tickDistanceManager() {
+    public boolean tickDistanceManager() { // Paper - private -> public
         boolean flag = this.chunkMapDistance.a(this.playerChunkMap);
         boolean flag1 = this.playerChunkMap.b();
 
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -0,0 +0,0 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
         this.pitch = MathHelper.a(f1, -90.0F, 90.0F) % 360.0F;
         this.lastYaw = this.yaw;
         this.lastPitch = this.pitch;
-        world.getChunkAt((int) Math.floor(this.locX()) >> 4, (int) Math.floor(this.locZ()) >> 4); // CraftBukkit
+        if (valid) world.getChunkAt((int) Math.floor(this.locX()) >> 4, (int) Math.floor(this.locZ()) >> 4); // CraftBukkit // Paper
     }
 
     public void c(Vec3D vec3d) {
diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/EntityPlayer.java
+++ b/src/main/java/net/minecraft/server/EntityPlayer.java
@@ -0,0 +0,0 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
 
     private static final Logger LOGGER = LogManager.getLogger();
     public PlayerConnection playerConnection;
+    public NetworkManager networkManager; // Paper
     public final MinecraftServer server;
     public final PlayerInteractManager playerInteractManager;
     public final Deque<Integer> removeQueue = new ArrayDeque<>(); // Paper
@@ -0,0 +0,0 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
     public boolean joining = true;
     public boolean sentListPacket = false;
     public boolean supressTrackerForLogin = false; // Paper
+    public boolean didPlayerJoinEvent = false; // Paper
     public Integer clientViewDistance;
     // CraftBukkit end
     public PlayerNaturallySpawnCreaturesEvent playerNaturallySpawnedEvent; // Paper
diff --git a/src/main/java/net/minecraft/server/LoginListener.java b/src/main/java/net/minecraft/server/LoginListener.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/LoginListener.java
+++ b/src/main/java/net/minecraft/server/LoginListener.java
@@ -0,0 +0,0 @@ public class LoginListener implements PacketLoginInListener {
             }
             // Paper end
         } else if (this.g == LoginListener.EnumProtocolState.DELAY_ACCEPT) {
-            EntityPlayer entityplayer = this.server.getPlayerList().getPlayer(this.i.getId());
+            EntityPlayer entityplayer = this.server.getPlayerList().getActivePlayer(this.i.getId()); // Paper
 
             if (entityplayer == null) {
                 this.g = LoginListener.EnumProtocolState.READY_TO_ACCEPT;
@@ -0,0 +0,0 @@ public class LoginListener implements PacketLoginInListener {
             }
 
             this.networkManager.sendPacket(new PacketLoginOutSuccess(this.i));
-            EntityPlayer entityplayer = this.server.getPlayerList().getPlayer(this.i.getId());
+            EntityPlayer entityplayer = this.server.getPlayerList().getActivePlayer(this.i.getId()); // Paper
 
             if (entityplayer != null) {
                 this.g = LoginListener.EnumProtocolState.DELAY_ACCEPT;
diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -0,0 +0,0 @@ public class PlayerConnection implements PacketListenerPlayIn {
     private static final Logger LOGGER = LogManager.getLogger();
     public final NetworkManager networkManager;
     private final MinecraftServer minecraftServer;
+    Runnable playerJoinReady; // Paper
     public EntityPlayer player;
     private int e;
     private long lastKeepAlive = SystemUtils.getMonotonicMillis(); private void setLastPing(long lastPing) { this.lastKeepAlive = lastPing;}; private long getLastPing() { return this.lastKeepAlive;}; // Paper - OBFHELPER
@@ -0,0 +0,0 @@ public class PlayerConnection implements PacketListenerPlayIn {
     // CraftBukkit end
 
     public void tick() {
+        // Paper start - login async
+        Runnable playerJoinReady = this.playerJoinReady;
+        if (playerJoinReady != null) {
+            this.playerJoinReady = null;
+            playerJoinReady.run();
+        }
+        // Don't tick if not valid (dead), otherwise we load chunks below
+        if (this.player.valid) {
+        // Paper end
         this.syncPosition();
         this.player.lastX = this.player.locX();
         this.player.lastY = this.player.locY();
@@ -0,0 +0,0 @@ public class PlayerConnection implements PacketListenerPlayIn {
             this.r = null;
             this.D = false;
             this.E = 0;
-        }
+        }} // Paper - end if (valid)
 
         this.minecraftServer.getMethodProfiler().enter("keepAlive");
         // Paper Start - give clients a longer time to respond to pings as per pre 1.12.2 timings
diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/PlayerList.java
+++ b/src/main/java/net/minecraft/server/PlayerList.java
@@ -0,0 +0,0 @@ import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
 import javax.annotation.Nullable;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
@@ -0,0 +0,0 @@ public abstract class PlayerList {
     private static final SimpleDateFormat g = new SimpleDateFormat("yyyy-MM-dd 'at' HH:mm:ss z");
     private final MinecraftServer server;
     public final List<EntityPlayer> players = new java.util.concurrent.CopyOnWriteArrayList(); // CraftBukkit - ArrayList -> CopyOnWriteArrayList: Iterator safety
-    private final Map<UUID, EntityPlayer> j = Maps.newHashMap();
+    private final Map<UUID, EntityPlayer> j = Maps.newHashMap();Map<UUID, EntityPlayer> getUUIDMap() { return j; } // Paper - OBFHELPER
     private final GameProfileBanList k;
     private final IpBanList l;
     private final OpList operators;
     private final WhiteList whitelist;
+    private final Map<UUID, EntityPlayer> pendingPlayers = Maps.newHashMap(); // Paper
     // CraftBukkit start
     // private final Map<UUID, ServerStatisticManager> o;
     // private final Map<UUID, AdvancementDataPlayer> p;
@@ -0,0 +0,0 @@ public abstract class PlayerList {
     }
 
     public void a(NetworkManager networkmanager, EntityPlayer entityplayer) {
+        EntityPlayer prev = pendingPlayers.put(entityplayer.getUniqueID(), entityplayer);// Paper
+        if (prev != null) {
+            disconnectPendingPlayer(prev);
+        }
+        entityplayer.networkManager = networkmanager; // Paper
         entityplayer.loginTime = System.currentTimeMillis(); // Paper
         GameProfile gameprofile = entityplayer.getProfile();
         UserCache usercache = this.server.getUserCache();
@@ -0,0 +0,0 @@ public abstract class PlayerList {
         if (nbttagcompound != null && nbttagcompound.hasKey("bukkit")) {
             NBTTagCompound bukkit = nbttagcompound.getCompound("bukkit");
             s = bukkit.hasKeyOfType("lastKnownName", 8) ? bukkit.getString("lastKnownName") : s;
-        }
+        }String lastKnownName = s; // Paper
         // CraftBukkit end
 
         if (nbttagcompound != null) {
@@ -0,0 +0,0 @@ public abstract class PlayerList {
         entityplayer.B().a(entityplayer);
         this.sendScoreboard(worldserver1.getScoreboard(), entityplayer);
         this.server.invalidatePingSample();
+        // Paper start - async load spawn in chunk
+        WorldServer finalWorldserver = worldserver;
+        WorldServer finalWorldserver1 = worldserver1;
+        int chunkX = loc.getBlockX() >> 4;
+        int chunkZ = loc.getBlockZ() >> 4;
+        final ChunkCoordIntPair pos = new ChunkCoordIntPair(chunkX, chunkZ);
+        PlayerChunkMap playerChunkMap = finalWorldserver.getChunkProvider().playerChunkMap;
+        playerChunkMap.chunkDistanceManager.addTicketAtLevel(TicketType.LOGIN, pos, 31, pos.pair());
+        worldserver.getChunkProvider().tickDistanceManager();
+        worldserver.getChunkProvider().getChunkAtAsynchronously(chunkX, chunkZ, true, true).thenApply(chunk -> {
+            PlayerChunk updatingChunk = playerChunkMap.getUpdatingChunk(pos.pair());
+            if (updatingChunk != null) {
+                return updatingChunk.getEntityTickingFuture();
+            } else {
+                return CompletableFuture.completedFuture(chunk);
+            }
+        }).thenAccept(chunk -> {
+            playerconnection.playerJoinReady = () -> {
+                postChunkLoadJoin(
+                    entityplayer, finalWorldserver, finalWorldserver1, networkmanager, playerconnection,
+                    nbttagcompound, networkmanager.getSocketAddress().toString(), lastKnownName
+                );
+                //playerChunkMap.chunkDistanceManager.removeTicketAtLevel(TicketType.LOGIN, pos, 31, pos.pair());
+            };
+        });
+    }
+
+    EntityPlayer getActivePlayer(UUID uuid) {
+        EntityPlayer player = this.getUUIDMap().get(uuid);
+        return player != null ? player : pendingPlayers.get(uuid);
+    }
+
+    void disconnectPendingPlayer(EntityPlayer entityplayer) {
+        ChatMessage msg = new ChatMessage("multiplayer.disconnect.duplicate_login", new Object[0]);
+        entityplayer.networkManager.sendPacket(new PacketPlayOutKickDisconnect(msg), (future) -> {
+            entityplayer.networkManager.close(msg);
+            entityplayer.networkManager = null;
+        });
+    }
+
+    private void postChunkLoadJoin(EntityPlayer entityplayer, WorldServer worldserver, WorldServer worldserver1, NetworkManager networkmanager, PlayerConnection playerconnection, NBTTagCompound nbttagcompound, String s1, String s) {
+        pendingPlayers.remove(entityplayer.getUniqueID(), entityplayer);
+        if (!networkmanager.isConnected()) {
+            return;
+        }
+        entityplayer.didPlayerJoinEvent = true;
+        // Paper end
         ChatMessage chatmessage;
 
         if (entityplayer.getProfile().getName().equalsIgnoreCase(s)) {
@@ -0,0 +0,0 @@ public abstract class PlayerList {
         entityplayer.supressTrackerForLogin = true;
         worldserver.addPlayerJoin(entityplayer);
         this.server.getBossBattleCustomData().a(entityplayer); // see commented out section below worldserver.addPlayerJoin(entityplayer);
-        mountSavedVehicle(entityplayer, worldserver, nbttagcompound);
+        mountSavedVehicle(entityplayer, worldserver, worldserver1, nbttagcompound);
         // Paper end
         // CraftBukkit start
         PlayerJoinEvent playerJoinEvent = new PlayerJoinEvent(cserver.getPlayer(entityplayer), joinMessage);
@@ -0,0 +0,0 @@ public abstract class PlayerList {
         }
         entityplayer.sentListPacket = true;
         entityplayer.supressTrackerForLogin = false; // Paper
-        ((WorldServer)entityplayer.world).getChunkProvider().playerChunkMap.addEntity(entityplayer); // Paper - track entity now
         // CraftBukkit end
 
         entityplayer.playerConnection.sendPacket(new PacketPlayOutEntityMetadata(entityplayer.getId(), entityplayer.datawatcher, true)); // CraftBukkit - BungeeCord#2321, send complete data to self on spawn
@@ -0,0 +0,0 @@ public abstract class PlayerList {
         }
 
         // Paper start - move vehicle into method so it can be called above - short circuit around that code
+        ((WorldServer)entityplayer.world).getChunkProvider().playerChunkMap.addEntity(entityplayer); // track entity now
         onPlayerJoinFinish(entityplayer, worldserver, s1);
     }
-    private void mountSavedVehicle(EntityPlayer entityplayer, WorldServer worldserver, NBTTagCompound nbttagcompound) {
+    private void mountSavedVehicle(EntityPlayer entityplayer, WorldServer worldserver, WorldServer worldserver1, NBTTagCompound nbttagcompound) {
         // Paper end
         if (nbttagcompound != null && nbttagcompound.hasKeyOfType("RootVehicle", 10)) {
             NBTTagCompound nbttagcompound1 = nbttagcompound.getCompound("RootVehicle");
@@ -0,0 +0,0 @@ public abstract class PlayerList {
 
     protected void savePlayerFile(EntityPlayer entityplayer) {
         if (!entityplayer.getBukkitEntity().isPersistent()) return; // CraftBukkit
+        if (!entityplayer.didPlayerJoinEvent) return; // Paper - If we never fired PJE, we disconnected during login. Data has not changed, and additionally, our saved vehicle is not loaded! If we save now, we will lose our vehicle (CraftBukkit bug)
         this.playerFileData.save(entityplayer);
         ServerStatisticManager serverstatisticmanager = (ServerStatisticManager) entityplayer.getStatisticManager(); // CraftBukkit
 
@@ -0,0 +0,0 @@ public abstract class PlayerList {
         entityplayer.closeInventory(org.bukkit.event.inventory.InventoryCloseEvent.Reason.DISCONNECT); // Paper
 
         PlayerQuitEvent playerQuitEvent = new PlayerQuitEvent(cserver.getPlayer(entityplayer), "\u00A7e" + entityplayer.getName() + " left the game");
-        cserver.getPluginManager().callEvent(playerQuitEvent);
+        if (entityplayer.didPlayerJoinEvent) cserver.getPluginManager().callEvent(playerQuitEvent); // Paper - if we disconnected before join ever fired, don't fire quit
         entityplayer.getBukkitEntity().disconnect(playerQuitEvent.getQuitMessage());
 
         if (server.isMainThread()) entityplayer.playerTick(); // SPIGOT-924 // Paper - don't tick during emergency shutdowns (Watchdog)
@@ -0,0 +0,0 @@ public abstract class PlayerList {
             // this.p.remove(uuid);
             // CraftBukkit end
         }
+        // Paper start
+        entityplayer1 = pendingPlayers.get(uuid);
+        if (entityplayer1 == entityplayer) {
+            pendingPlayers.remove(uuid);
+        }
+        entityplayer.networkManager = null;
+        // Paper end
 
         // CraftBukkit start
         // this.sendAll(new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.REMOVE_PLAYER, new EntityPlayer[]{entityplayer}));
@@ -0,0 +0,0 @@ public abstract class PlayerList {
         cserver.getScoreboardManager().removePlayer(entityplayer.getBukkitEntity());
         // CraftBukkit end
 
-        return playerQuitEvent.getQuitMessage(); // CraftBukkit
+        return entityplayer.didPlayerJoinEvent ? playerQuitEvent.getQuitMessage() : null; // CraftBukkit // Paper - don't print quit if we never printed join
     }
 
     // CraftBukkit start - Whole method, SocketAddress to LoginListener, added hostname to signature, return EntityPlayer
@@ -0,0 +0,0 @@ public abstract class PlayerList {
                 list.add(entityplayer);
             }
         }
+        // Paper start - check pending players too
+        entityplayer = pendingPlayers.get(uuid);
+        if (entityplayer != null) {
+            this.pendingPlayers.remove(uuid);
+            disconnectPendingPlayer(entityplayer);
+        }
+        // Paper end
 
         Iterator iterator = list.iterator();
 
diff --git a/src/main/java/net/minecraft/server/TicketType.java b/src/main/java/net/minecraft/server/TicketType.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/TicketType.java
+++ b/src/main/java/net/minecraft/server/TicketType.java
@@ -0,0 +0,0 @@ public class TicketType<T> {
     public static final TicketType<ChunkCoordIntPair> FORCED = a("forced", Comparator.comparingLong(ChunkCoordIntPair::pair));
     public static final TicketType<ChunkCoordIntPair> LIGHT = a("light", Comparator.comparingLong(ChunkCoordIntPair::pair));
     public static final TicketType<BlockPosition> PORTAL = a("portal", BaseBlockPosition::compareTo, 300);
+    public static final TicketType<Long> LOGIN = a("login", Long::compareTo, 100); // Paper
     public static final TicketType<Integer> POST_TELEPORT = a("post_teleport", Integer::compareTo, 5);
     public static final TicketType<ChunkCoordIntPair> UNKNOWN = a("unknown", Comparator.comparingLong(ChunkCoordIntPair::pair), 1);
     public static final TicketType<Unit> PLUGIN = a("plugin", (a, b) -> 0); // CraftBukkit
