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Paper/patches/server/0924-Add-PlayerTradeEvent-and-PlayerPurchaseEvent.patch
Bjarne Koll c5a10665b8
Remove wall-time / unused skip tick protection (#11412) 
Spigot still maintains some partial implementation of "tick skipping", a
practice in which the MinecraftServer.currentTick field is updated not
by an increment of one per actual tick, but instead set to
System.currentTimeMillis() / 50. This behaviour means that the tracked
tick may "skip" a tick value in case a previous tick took more than the
expected 50ms.

To compensate for this in important paths, spigot/craftbukkit
implements "wall-time". Instead of incrementing/decrementing ticks on
block entities/entities by one for each call to their tick() method,
they instead increment/decrement important values, like
an ItemEntity's age or pickupDelay, by the difference of
`currentTick - lastTick`, where `lastTick` is the value of
`currentTick` during the last tick() call.

These "fixes" however do not play nicely with minecraft's simulation
distance as entities/block entities implementing the above behaviour
would "catch up" their values when moving from a non-ticking chunk to a
ticking one as their `lastTick` value remains stuck on the last tick in
a ticking chunk and hence lead to a large "catch up" once ticked again.

Paper completely removes the "tick skipping" behaviour (See patch
"Further-improve-server-tick-loop"), making the above precautions
completely unnecessary, which also rids paper of the previous described
incompatibility with non-ticking chunks.
2024-09-19 16:36:07 +02:00

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Originalformat Blame Verlauf

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 2 Jul 2020 16:12:10 -0700
Subject: [PATCH] Add PlayerTradeEvent and PlayerPurchaseEvent
Co-authored-by: Alexander <protonull@protonmail.com>
diff --git a/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java b/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
index 2a155d3611ca2370830ca763d40074df6641958f..d28ebcae036168dd65a5f3236d12ee416308c23f 100644
--- a/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
+++ b/src/main/java/net/minecraft/world/entity/npc/AbstractVillager.java
@@ -141,11 +141,24 @@ public abstract class AbstractVillager extends AgeableMob implements InventoryCa
@Override
public void overrideXp(int experience) {}
+ // Paper start - Add PlayerTradeEvent and PlayerPurchaseEvent
+ @Override
+ public void processTrade(MerchantOffer recipe, @Nullable io.papermc.paper.event.player.PlayerPurchaseEvent event) { // The MerchantRecipe passed in here is the one set by the PlayerPurchaseEvent
+ if (event == null || event.willIncreaseTradeUses()) {
+ recipe.increaseUses();
+ }
+ if (event == null || event.isRewardingExp()) {
+ this.rewardTradeXp(recipe);
+ }
+ this.notifyTrade(recipe);
+ }
+ // Paper end - Add PlayerTradeEvent and PlayerPurchaseEvent
+
@Override
public void notifyTrade(MerchantOffer offer) {
- offer.increaseUses();
+ // offer.increaseUses(); // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent
this.ambientSoundTime = -this.getAmbientSoundInterval();
- this.rewardTradeXp(offer);
+ // this.rewardTradeXp(offer); // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent
if (this.tradingPlayer instanceof ServerPlayer) {
CriteriaTriggers.TRADE.trigger((ServerPlayer) this.tradingPlayer, this, offer.getResult());
}
diff --git a/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java b/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
index 8a1035c0aa859f67a6806c183d96a88ddf760baa..46159a127d910028c62ada90ff2d2dccc3b62fc3 100644
--- a/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/AbstractContainerMenu.java
@@ -768,6 +768,14 @@ public abstract class AbstractContainerMenu {
public abstract boolean stillValid(Player player);
protected boolean moveItemStackTo(ItemStack stack, int startIndex, int endIndex, boolean fromLast) {
+ // Paper start - Add PlayerTradeEvent and PlayerPurchaseEvent
+ return this.moveItemStackTo(stack, startIndex, endIndex, fromLast, false);
+ }
+ protected boolean moveItemStackTo(ItemStack stack, int startIndex, int endIndex, boolean fromLast, boolean isCheck) {
+ if (isCheck) {
+ stack = stack.copy();
+ }
+ // Paper end - Add PlayerTradeEvent and PlayerPurchaseEvent
boolean flag1 = false;
int k = startIndex;
@@ -791,6 +799,11 @@ public abstract class AbstractContainerMenu {
slot = (Slot) this.slots.get(k);
itemstack1 = slot.getItem();
+ // Paper start - Add PlayerTradeEvent and PlayerPurchaseEvent; clone if only a check
+ if (isCheck) {
+ itemstack1 = itemstack1.copy();
+ }
+ // Paper end - Add PlayerTradeEvent and PlayerPurchaseEvent
if (!itemstack1.isEmpty() && ItemStack.isSameItemSameComponents(stack, itemstack1)) {
l = itemstack1.getCount() + stack.getCount();
int i1 = slot.getMaxStackSize(itemstack1);
@@ -798,12 +811,16 @@ public abstract class AbstractContainerMenu {
if (l <= i1) {
stack.setCount(0);
itemstack1.setCount(l);
+ if (!isCheck) { // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent
slot.setChanged();
+ } // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent
flag1 = true;
} else if (itemstack1.getCount() < i1) {
stack.shrink(i1 - itemstack1.getCount());
itemstack1.setCount(i1);
+ if (!isCheck) { // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent
slot.setChanged();
+ } // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent
flag1 = true;
}
}
@@ -834,10 +851,21 @@ public abstract class AbstractContainerMenu {
slot = (Slot) this.slots.get(k);
itemstack1 = slot.getItem();
+ // Paper start - Add PlayerTradeEvent and PlayerPurchaseEvent
+ if (isCheck) {
+ itemstack1 = itemstack1.copy();
+ }
+ // Paper end - Add PlayerTradeEvent and PlayerPurchaseEvent
if (itemstack1.isEmpty() && slot.mayPlace(stack)) {
l = slot.getMaxStackSize(stack);
+ // Paper start - Add PlayerTradeEvent and PlayerPurchaseEvent
+ if (isCheck) {
+ stack.shrink(Math.min(stack.getCount(), l));
+ } else {
+ // Paper end - Add PlayerTradeEvent and PlayerPurchaseEvent
slot.setByPlayer(stack.split(Math.min(stack.getCount(), l)));
slot.setChanged();
+ } // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent
flag1 = true;
break;
}
diff --git a/src/main/java/net/minecraft/world/inventory/MerchantMenu.java b/src/main/java/net/minecraft/world/inventory/MerchantMenu.java
index e45ab844afdf1a65f23eeff4c4d6cd9e3a8a28e2..5de2030452b96a4df7ce0be82f07e002db595dee 100644
--- a/src/main/java/net/minecraft/world/inventory/MerchantMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/MerchantMenu.java
@@ -135,12 +135,12 @@ public class MerchantMenu extends AbstractContainerMenu {
itemstack = itemstack1.copy();
if (slot == 2) {
- if (!this.moveItemStackTo(itemstack1, 3, 39, true)) {
+ if (!this.moveItemStackTo(itemstack1, 3, 39, true, true)) { // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent
return ItemStack.EMPTY;
}
- slot1.onQuickCraft(itemstack1, itemstack);
- this.playTradeSound();
+ // slot1.onQuickCraft(itemstack1, itemstack); // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent; moved to after the non-check moveItemStackTo call
+ // this.playTradeSound();
} else if (slot != 0 && slot != 1) {
if (slot >= 3 && slot < 30) {
if (!this.moveItemStackTo(itemstack1, 30, 39, false)) {
@@ -153,6 +153,7 @@ public class MerchantMenu extends AbstractContainerMenu {
return ItemStack.EMPTY;
}
+ if (slot != 2) { // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent; moved down for slot 2
if (itemstack1.isEmpty()) {
slot1.setByPlayer(ItemStack.EMPTY);
} else {
@@ -164,6 +165,21 @@ public class MerchantMenu extends AbstractContainerMenu {
}
slot1.onTake(player, itemstack1);
+ } // Paper start - Add PlayerTradeEvent and PlayerPurchaseEvent; handle slot 2
+ if (slot == 2) { // is merchant result slot
+ slot1.onTake(player, itemstack1);
+ if (itemstack1.isEmpty()) {
+ slot1.set(ItemStack.EMPTY);
+ return ItemStack.EMPTY;
+ }
+
+ this.moveItemStackTo(itemstack1, 3, 39, true, false); // This should always succeed because it's checked above
+
+ slot1.onQuickCraft(itemstack1, itemstack);
+ this.playTradeSound();
+ slot1.set(ItemStack.EMPTY); // itemstack1 should ALWAYS be empty
+ }
+ // Paper end - Add PlayerTradeEvent and PlayerPurchaseEvent
}
return itemstack;
diff --git a/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java b/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java
index 26227033613a641a9d5a6f29356b19e54753b3f1..c2376538215604210d08acd33e8e5fdc8a35c7d3 100644
--- a/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java
+++ b/src/main/java/net/minecraft/world/inventory/MerchantResultSlot.java
@@ -47,13 +47,32 @@ public class MerchantResultSlot extends Slot {
@Override
public void onTake(Player player, ItemStack stack) {
- this.checkTakeAchievements(stack);
+ // this.checkTakeAchievements(stack); // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent; move to after event is called and not cancelled
MerchantOffer merchantOffer = this.slots.getActiveOffer();
+ // Paper start - Add PlayerTradeEvent and PlayerPurchaseEvent
+ io.papermc.paper.event.player.PlayerPurchaseEvent event = null;
+ if (merchantOffer != null && player instanceof net.minecraft.server.level.ServerPlayer serverPlayer) {
+ if (this.merchant instanceof net.minecraft.world.entity.npc.AbstractVillager abstractVillager) {
+ event = new io.papermc.paper.event.player.PlayerTradeEvent(serverPlayer.getBukkitEntity(), (org.bukkit.entity.AbstractVillager) abstractVillager.getBukkitEntity(), merchantOffer.asBukkit(), true, true);
+ } else if (this.merchant instanceof org.bukkit.craftbukkit.inventory.CraftMerchantCustom.MinecraftMerchant) {
+ event = new io.papermc.paper.event.player.PlayerPurchaseEvent(serverPlayer.getBukkitEntity(), merchantOffer.asBukkit(), false, true);
+ }
+ if (event != null) {
+ if (!event.callEvent()) {
+ stack.setCount(0);
+ event.getPlayer().updateInventory();
+ return;
+ }
+ merchantOffer = org.bukkit.craftbukkit.inventory.CraftMerchantRecipe.fromBukkit(event.getTrade()).toMinecraft();
+ }
+ }
+ this.checkTakeAchievements(stack);
+ // Paper end - Add PlayerTradeEvent and PlayerPurchaseEvent
if (merchantOffer != null) {
ItemStack itemStack = this.slots.getItem(0);
ItemStack itemStack2 = this.slots.getItem(1);
if (merchantOffer.take(itemStack, itemStack2) || merchantOffer.take(itemStack2, itemStack)) {
- this.merchant.notifyTrade(merchantOffer);
+ this.merchant.processTrade(merchantOffer, event); // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent
player.awardStat(Stats.TRADED_WITH_VILLAGER);
this.slots.setItem(0, itemStack);
this.slots.setItem(1, itemStack2);
diff --git a/src/main/java/net/minecraft/world/item/trading/Merchant.java b/src/main/java/net/minecraft/world/item/trading/Merchant.java
index 5a350948a4735902f5c612592bc9d100445a0c8a..716b30dcd7e63c66736c448dd136c9f74dc7fe43 100644
--- a/src/main/java/net/minecraft/world/item/trading/Merchant.java
+++ b/src/main/java/net/minecraft/world/item/trading/Merchant.java
@@ -20,6 +20,7 @@ public interface Merchant {
void overrideOffers(MerchantOffers offers);
+ default void processTrade(MerchantOffer merchantRecipe, @Nullable io.papermc.paper.event.player.PlayerPurchaseEvent event) { this.notifyTrade(merchantRecipe); } // Paper
void notifyTrade(MerchantOffer offer);
void notifyTradeUpdated(ItemStack stack);
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
index ef47eb9a321a7b082413d3986d3d394afb899610..54debe9da0a26aea02c964fdc7efb372e07974c0 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMerchantCustom.java
@@ -76,10 +76,25 @@ public class CraftMerchantCustom implements CraftMerchant {
return this.trades;
}
+ // Paper start - Add PlayerTradeEvent and PlayerPurchaseEvent
+ @Override
+ public void processTrade(MerchantOffer merchantRecipe, @javax.annotation.Nullable io.papermc.paper.event.player.PlayerPurchaseEvent event) { // The MerchantRecipe passed in here is the one set by the PlayerPurchaseEvent
+ /** Based on {@link net.minecraft.world.entity.npc.AbstractVillager#processTrade(MerchantOffer, io.papermc.paper.event.player.PlayerPurchaseEvent)} */
+ if (getTradingPlayer() instanceof net.minecraft.server.level.ServerPlayer) {
+ if (event == null || event.willIncreaseTradeUses()) {
+ merchantRecipe.increaseUses();
+ }
+ if (event == null || event.isRewardingExp()) {
+ this.tradingPlayer.level().addFreshEntity(new net.minecraft.world.entity.ExperienceOrb(this.tradingPlayer.level(), this.tradingPlayer.getX(), this.tradingPlayer.getY(), this.tradingPlayer.getZ(), merchantRecipe.getXp(), org.bukkit.entity.ExperienceOrb.SpawnReason.VILLAGER_TRADE, this.tradingPlayer, null));
+ }
+ }
+ this.notifyTrade(merchantRecipe);
+ }
+ // Paper end - Add PlayerTradeEvent and PlayerPurchaseEvent
@Override
public void notifyTrade(MerchantOffer offer) {
// increase recipe's uses
- offer.increaseUses();
+ // offer.increaseUses(); // Paper - Add PlayerTradeEvent and PlayerPurchaseEvent; handled above in processTrade
}
@Override
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