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Code Issues
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Paper/patches/server/0894-Fix-several-issues-with-EntityBreedEvent.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation 
Firstly, the old methods all routed to the CompletableFuture method.
However, the CF method could not guarantee that if the caller
was off-main that the future would be "completed" on-main. Since
the callback methods used the CF one, this meant that the callback
methods did not guarantee that the callbacks were to be called on
the main thread.

Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb)
so that the methods with the callback are guaranteed to invoke
the callback on the main thread. The CF behavior remains unchanged;
it may still appear to complete on main if invoked off-main.

Secondly, remove the scheduleOnMain invocation in the async
chunk completion. This unnecessarily delays the callback
by 1 tick.

Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which
will load chunks within an area. This method is provided as a helper
as keeping all chunks loaded within an area can be complicated to
implement for plugins (due to the lacking ticket API), and is
already implemented internally anyways.

Fourthly, remove the ticket addition that occured with getChunkAt
and getChunkAtAsync. The ticket addition may delay the unloading
of the chunk unnecessarily. It also fixes a very rare timing bug
where the future/callback would be completed after the chunk
unloads.
2024-11-18 23:00:59 -08:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 15 Dec 2022 00:14:44 -0800
Subject: [PATCH] Fix several issues with EntityBreedEvent
Upstream did not account for different hands when storing
the breed item for later use in the event. Also they only
stored a reference to the stack, not a copy so if the stack
changed after love mode was started, the breed item in the event
also changed. Also in several places, the breed item was stored after
it was decreased by one to consume the item.
diff --git a/src/main/java/net/minecraft/world/entity/animal/Animal.java b/src/main/java/net/minecraft/world/entity/animal/Animal.java
index 775bfac26aaa6db998c2647ec81247b67d0bf784..5677dc97ed83652f261100cf391883cfac7d16fe 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Animal.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Animal.java
@@ -158,8 +158,9 @@ public abstract class Animal extends AgeableMob {
int i = this.getAge();
if (!this.level().isClientSide && i == 0 && this.canFallInLove()) {
+ final ItemStack breedCopy = itemstack.copy(); // Paper - Fix EntityBreedEvent copying
this.usePlayerItem(player, hand, itemstack);
- this.setInLove(player);
+ this.setInLove(player, breedCopy); // Paper - Fix EntityBreedEvent copying
this.playEatingSound();
return InteractionResult.SUCCESS_SERVER;
}
@@ -201,10 +202,18 @@ public abstract class Animal extends AgeableMob {
return this.inLove <= 0;
}
+ @Deprecated @io.papermc.paper.annotation.DoNotUse // Paper - Fix EntityBreedEvent copying
public void setInLove(@Nullable Player player) {
+ // Paper start - Fix EntityBreedEvent copying
+ this.setInLove(player, null);
+ }
+ public void setInLove(@Nullable Player player, @Nullable ItemStack breedItemCopy) {
+ if (breedItemCopy != null) this.breedItem = breedItemCopy;
+ // Paper end - Fix EntityBreedEvent copying
// CraftBukkit start
EntityEnterLoveModeEvent entityEnterLoveModeEvent = CraftEventFactory.callEntityEnterLoveModeEvent(player, this, 600);
if (entityEnterLoveModeEvent.isCancelled()) {
+ this.breedItem = null; // Paper - Fix EntityBreedEvent copying; clear if cancelled
return;
}
this.inLove = entityEnterLoveModeEvent.getTicksInLove();
@@ -212,7 +221,7 @@ public abstract class Animal extends AgeableMob {
if (player != null) {
this.loveCause = player.getUUID();
}
- this.breedItem = player.getInventory().getSelected(); // CraftBukkit
+ // Paper - Fix EntityBreedEvent copying; set breed item in better place
this.level().broadcastEntityEvent(this, (byte) 18);
}
diff --git a/src/main/java/net/minecraft/world/entity/animal/Panda.java b/src/main/java/net/minecraft/world/entity/animal/Panda.java
index b654bec0fbe903fac24f3bb99399455bf367c68a..be753557d7ebd6f1e82b1bdb6d60ecc450f72eec 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Panda.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Panda.java
@@ -653,8 +653,9 @@ public class Panda extends Animal {
this.usePlayerItem(player, hand, itemstack);
this.ageUp((int) ((float) (-this.getAge() / 20) * 0.1F), true);
} else if (!this.level().isClientSide && this.getAge() == 0 && this.canFallInLove()) {
+ final ItemStack breedCopy = itemstack.copy(); // Paper - Fix EntityBreedEvent copying
this.usePlayerItem(player, hand, itemstack);
- this.setInLove(player);
+ this.setInLove(player, breedCopy); // Paper - Fix EntityBreedEvent copying
} else {
Level world = this.level();
diff --git a/src/main/java/net/minecraft/world/entity/animal/camel/Camel.java b/src/main/java/net/minecraft/world/entity/animal/camel/Camel.java
index c99d37a40c63726c11980adccc67d09fd5132885..f3c884ab9c09f04dd01cabf2ee9de3b5b620563d 100644
--- a/src/main/java/net/minecraft/world/entity/animal/camel/Camel.java
+++ b/src/main/java/net/minecraft/world/entity/animal/camel/Camel.java
@@ -395,7 +395,7 @@ public class Camel extends AbstractHorse {
boolean flag1 = this.isTamed() && this.getAge() == 0 && this.canFallInLove();
if (flag1) {
- this.setInLove(player);
+ this.setInLove(player, item.copy()); // Paper - Fix EntityBreedEvent copying
}
boolean flag2 = this.isBaby();
diff --git a/src/main/java/net/minecraft/world/entity/animal/horse/AbstractHorse.java b/src/main/java/net/minecraft/world/entity/animal/horse/AbstractHorse.java
index 74151d69380e4adede40c7d7fc20834553706730..8aed30cdbbfdd42c20dcd4c8773c8a0ee21a980d 100644
--- a/src/main/java/net/minecraft/world/entity/animal/horse/AbstractHorse.java
+++ b/src/main/java/net/minecraft/world/entity/animal/horse/AbstractHorse.java
@@ -585,7 +585,7 @@ public abstract class AbstractHorse extends Animal implements ContainerListener,
b0 = 5;
if (!this.level().isClientSide && this.isTamed() && this.getAge() == 0 && !this.isInLove()) {
flag = true;
- this.setInLove(player);
+ this.setInLove(player, item.copy()); // Paper - Fix EntityBreedEvent copying
}
} else if (item.is(Items.GOLDEN_APPLE) || item.is(Items.ENCHANTED_GOLDEN_APPLE)) {
f = 10.0F;
@@ -593,7 +593,7 @@ public abstract class AbstractHorse extends Animal implements ContainerListener,
b0 = 10;
if (!this.level().isClientSide && this.isTamed() && this.getAge() == 0 && !this.isInLove()) {
flag = true;
- this.setInLove(player);
+ this.setInLove(player, item.copy()); // Paper - Fix EntityBreedEvent copying
}
}
diff --git a/src/main/java/net/minecraft/world/entity/animal/horse/Llama.java b/src/main/java/net/minecraft/world/entity/animal/horse/Llama.java
index 4da66867109394c8966e27551d20b4bcdf4bc9be..18bd483fe46de3d9dc129bffbccfba9d4cab9550 100644
--- a/src/main/java/net/minecraft/world/entity/animal/horse/Llama.java
+++ b/src/main/java/net/minecraft/world/entity/animal/horse/Llama.java
@@ -177,7 +177,7 @@ public class Llama extends AbstractChestedHorse implements VariantHolder<Llama.V
f = 10.0F;
if (this.isTamed() && this.getAge() == 0 && this.canFallInLove()) {
flag = true;
- this.setInLove(player);
+ this.setInLove(player, item.copy()); // Paper - Fix EntityBreedEvent copying
}
}
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