Properly resend entities (#8617)

patches/server/0942-Properly-resend-entities.patch

@@ -0,0 +1,107 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
+Date: Wed, 7 Dec 2022 17:25:19 -0500
+Subject: [PATCH] Properly resend entities
+
+This resolves some issues which caused entities to not be resent correctly.
+Entities that are interacted with need to be resent to the client, so we resend all the entity
+data to the player whilst making sure not to clear dirty entries from the tracker. This makes
+sure that values will be correctly updated to other players.
+
+See: https://github.com/PaperMC/Paper/pull/1896
+
+== AT ==
+public net.minecraft.server.level.ChunkMap$TrackedEntity.serverEntity
+
+diff --git a/src/main/java/net/minecraft/network/syncher/SynchedEntityData.java b/src/main/java/net/minecraft/network/syncher/SynchedEntityData.java
+index 755989780c955592e27cae2b4b5f0e90e13543b7..37e193f57938047c8b886ed7d2816411392f94b4 100644
+--- a/src/main/java/net/minecraft/network/syncher/SynchedEntityData.java
++++ b/src/main/java/net/minecraft/network/syncher/SynchedEntityData.java
+@@ -244,14 +244,46 @@ public class SynchedEntityData {
+     // CraftBukkit start
+     public void refresh(ServerPlayer to) {
+         if (!this.isEmpty()) {
+-            List<SynchedEntityData.DataValue<?>> list = this.getNonDefaultValues();
++            List<SynchedEntityData.DataValue<?>> list = this.packAll(); // Paper - Update EVERYTHING not just not default
+ 
+             if (list != null) {
++                if (to.getBukkitEntity().canSee(this.entity.getBukkitEntity())) { // Paper
+                 to.connection.send(new ClientboundSetEntityDataPacket(this.entity.getId(), list));
++                } // Paper
+             }
+         }
+     }
+     // CraftBukkit end
++    // Paper start
++    // We need to pack all as we cannot rely on "non default values" or "dirty" ones.
++    // Because these values can possibly be desynced on the client.
++    @Nullable
++    private List<SynchedEntityData.DataValue<?>> packAll() {
++        if (this.isEmpty()) {
++            return null;
++        }
++
++        List<SynchedEntityData.DataValue<?>> list = new ArrayList<>();
++        for (DataItem<?> dataItem : this.itemsById.values()) {
++            list.add(dataItem.value());
++        }
++
++        return list;
++    }
++
++    // This method should only be used if the data of an entity could have became desynced
++    // due to interactions on the client.
++    public void resendPossiblyDesyncedEntity(ServerPlayer player) {
++        if (this.entity.tracker == null) {
++            return;
++        }
++
++        net.minecraft.server.level.ServerEntity serverEntity = this.entity.tracker.serverEntity;
++        if (player.getBukkitEntity().canSee(entity.getBukkitEntity())) {
++            serverEntity.sendPairingData(player.connection::send, player);
++        }
++    }
++    // Paper end
+ 
+     public static class DataItem<T> {
+ 
+diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index 317a53cbaea38e1191f455b3d2c9c7971f505e9e..61053a0f90e604457998db61593b666ce07d02ef 100644
+--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -2774,7 +2774,7 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
+ 
+                             // Entity in bucket - SPIGOT-4048 and SPIGOT-6859a
+                             if ((entity instanceof Bucketable && entity instanceof LivingEntity && origItem != null && origItem.asItem() == Items.WATER_BUCKET) && (event.isCancelled() || ServerGamePacketListenerImpl.this.player.getInventory().getSelected() == null || ServerGamePacketListenerImpl.this.player.getInventory().getSelected().getItem() != origItem)) {
+-                                ServerGamePacketListenerImpl.this.send(new ClientboundAddEntityPacket(entity));
++                                entity.getEntityData().resendPossiblyDesyncedEntity(player); // Paper - The entire mob gets deleted, so resend it.
+                                 player.containerMenu.sendAllDataToRemote();
+                             }
+ 
+diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
+index cb0d6f2eba67b0f45ce0ce0f6c6b76167a87de10..2985cb1284230c3abf982e9180616e64c679d051 100644
+--- a/src/main/java/net/minecraft/server/players/PlayerList.java
++++ b/src/main/java/net/minecraft/server/players/PlayerList.java
+@@ -413,7 +413,7 @@ public abstract class PlayerList {
+         ((ServerLevel)player.level).getChunkSource().chunkMap.addEntity(player); // Paper - track entity now
+         // CraftBukkit end
+ 
+-        player.getEntityData().refresh(player); // CraftBukkit - BungeeCord#2321, send complete data to self on spawn
++        //player.getEntityData().refresh(player); // CraftBukkit - BungeeCord#2321, send complete data to self on spawn Paper - THIS IS NOT NEEDED ANYMORE
+ 
+         // CraftBukkit start - Only add if the player wasn't moved in the event
+         if (player.level == worldserver1 && !worldserver1.players().contains(player)) {
+diff --git a/src/main/java/net/minecraft/world/entity/animal/Bucketable.java b/src/main/java/net/minecraft/world/entity/animal/Bucketable.java
+index 09654dd8895669109246f9bff36ab5ff5f533f65..9695a80c45b36c84f5fdef651b26a2c09d7f1f9b 100644
+--- a/src/main/java/net/minecraft/world/entity/animal/Bucketable.java
++++ b/src/main/java/net/minecraft/world/entity/animal/Bucketable.java
+@@ -109,8 +109,7 @@ public interface Bucketable {
+             itemstack1 = CraftItemStack.asNMSCopy(playerBucketFishEvent.getEntityBucket());
+             if (playerBucketFishEvent.isCancelled()) {
+                 ((ServerPlayer) player).containerMenu.sendAllDataToRemote(); // We need to update inventory to resync client's bucket
+-                ((ServerPlayer) player).connection.send(new ClientboundAddEntityPacket(entity)); // We need to play out these packets as the client assumes the fish is gone
+-                entity.getEntityData().refresh((ServerPlayer) player); // Need to send data such as the display name to client
++                entity.getEntityData().resendPossiblyDesyncedEntity((ServerPlayer) player); // Paper
+                 return Optional.of(InteractionResult.FAIL);
+             }
+             entity.playSound(((Bucketable) entity).getPickupSound(), 1.0F, 1.0F);