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In general, the client now has an acknowledgment system that will cause block changes made by the client to be reverted correctly. Essentially: The client enters a "prediction" stage, where any block changes made will have its old blockstate captured (this is referred to as "server state"). If you update blocks during this stage, the client will update this captured server state as long as they're still currently predicting. After prediction is done (via an ack packet) all captured blockstates are reverted to their captured server state. This means that if the server actually updated a block and send a block update packet, it's correctly set, while if a block wasn't updated on the server but WAS updated on the client (server state wasn't updated), that change will be reverted. It should be noted that this system does not yet support block entities, so those still need to be resynced when needed. I discovered this when noticing that blocks broken outside of the player's valid interaction distance are still properly reverted, even though the server doesn't send any block updates, only an ack packet.
63 lines
3.8 KiB
Diff
63 lines
3.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
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Date: Tue, 23 May 2023 22:33:36 -0400
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Subject: [PATCH] Properly Cancel Usable Items
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This fixes the bug causing cancelling PlayerInteractEvent to cause items to continue to be used despite being cancelled on the server.
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For example, items being consumed but never finishing, shields being put up, etc.
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The underlying issue of this is that the client modifies their synced data values, and so we have to (forcibly) resend
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them in order for the client to reset their using item state.
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diff --git a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
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index e8ad6a1e497f399c5d8cd6a6ec192ddc932e3fb9..1a895a511d8bb20bcaf6ae5534ca70529d65951e 100644
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--- a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
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+++ b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
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@@ -557,6 +557,7 @@ public class ServerPlayerGameMode {
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}
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// Paper end - extend Player Interact cancellation
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player.getBukkitEntity().updateInventory(); // SPIGOT-2867
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+ this.player.resyncUsingItem(this.player); // Paper - Resend player's using item status
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enuminteractionresult = (event.useItemInHand() != Event.Result.ALLOW) ? InteractionResult.SUCCESS : InteractionResult.PASS;
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} else if (this.gameModeForPlayer == GameType.SPECTATOR) {
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MenuProvider itileinventory = iblockdata.getMenuProvider(world, blockposition);
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@@ -600,6 +601,11 @@ public class ServerPlayerGameMode {
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return enuminteractionresult1;
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}
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+ // Paper start - Cancel only if cancelled + if the interact result is different from default response
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+ else if (this.interactResult && this.interactResult != cancelledItem) {
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+ this.player.resyncUsingItem(this.player);
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+ }
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+ // Paper end
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}
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return enuminteractionresult;
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// CraftBukkit end
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diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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index dc50f0c4514cc239a4639a03e4edbda5c258b867..8b0bcaa4239a0966cf7b7676525c1ab69c25f534 100644
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--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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@@ -1924,6 +1924,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
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}
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if (cancelled) {
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+ this.player.resyncUsingItem(this.player); // Paper - Resend player's using item status
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this.player.getBukkitEntity().updateInventory(); // SPIGOT-2524
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return;
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}
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diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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index 371f6d2539eac7161a86bb64763b4ee228eccbdf..6d4d46163ffcffa98f400c2656703eb5c4818f40 100644
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--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
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+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
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@@ -3811,6 +3811,11 @@ public abstract class LivingEntity extends Entity implements Attackable {
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return ((Byte) this.entityData.get(LivingEntity.DATA_LIVING_ENTITY_FLAGS) & 2) > 0 ? InteractionHand.OFF_HAND : InteractionHand.MAIN_HAND;
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}
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+ // Paper start
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+ public void resyncUsingItem(ServerPlayer serverPlayer) {
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+ this.getEntityData().resendPossiblyDesyncedDataValues(java.util.List.of(DATA_LIVING_ENTITY_FLAGS), serverPlayer);
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+ }
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+ // Paper end
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private void updatingUsingItem() {
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if (this.isUsingItem()) {
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if (ItemStack.isSameItem(this.getItemInHand(this.getUsedItemHand()), this.useItem)) {
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