54 lines
3.1 KiB
Diff
54 lines
3.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sat, 11 Jul 2020 03:54:28 -0400
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Subject: [PATCH] Thread Safe Vanilla Command permission checking
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Datapacks check this on load and are built concurrently. This was breaking them badly due
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to race conditions.
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Plus, .canUse we want to be safe for async anyways.
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diff --git a/src/main/java/com/mojang/brigadier/tree/CommandNode.java b/src/main/java/com/mojang/brigadier/tree/CommandNode.java
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index 6976da79b20280fcd72dcfb8b48e2eb73257faf2..d9c47f3fc18266df3be1f564c01dfc3e26941380 100644
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--- a/src/main/java/com/mojang/brigadier/tree/CommandNode.java
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+++ b/src/main/java/com/mojang/brigadier/tree/CommandNode.java
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@@ -75,10 +75,10 @@ public abstract class CommandNode<S> implements Comparable<CommandNode<S>> {
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public synchronized boolean canUse(final S source) {
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if (source instanceof CommandListenerWrapper) {
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try {
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- ((CommandListenerWrapper) source).currentCommand = this;
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+ ((CommandListenerWrapper) source).currentCommand.set(this); // Paper
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return requirement.test(source);
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} finally {
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- ((CommandListenerWrapper) source).currentCommand = null;
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+ ((CommandListenerWrapper) source).currentCommand.set(null); // Paper
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}
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}
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// CraftBukkit end
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diff --git a/src/main/java/net/minecraft/server/CommandListenerWrapper.java b/src/main/java/net/minecraft/server/CommandListenerWrapper.java
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index 7073d697a5d35b9b72ea05d5608438ac3e54c20d..86f1cfe454ea0a989775b49a6b88375c766ef647 100644
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--- a/src/main/java/net/minecraft/server/CommandListenerWrapper.java
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+++ b/src/main/java/net/minecraft/server/CommandListenerWrapper.java
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@@ -33,7 +33,7 @@ public class CommandListenerWrapper implements ICompletionProvider, com.destroys
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private final ResultConsumer<CommandListenerWrapper> l;
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private final ArgumentAnchor.Anchor m;
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private final Vec2F n;
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- public volatile CommandNode currentCommand; // CraftBukkit
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+ public ThreadLocal<CommandNode> currentCommand = new ThreadLocal<>(); // CraftBukkit // Paper
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public CommandListenerWrapper(ICommandListener icommandlistener, Vec3D vec3d, Vec2F vec2f, WorldServer worldserver, int i, String s, IChatBaseComponent ichatbasecomponent, MinecraftServer minecraftserver, @Nullable Entity entity) {
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this(icommandlistener, vec3d, vec2f, worldserver, i, s, ichatbasecomponent, minecraftserver, entity, false, (commandcontext, flag, j) -> {
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@@ -150,9 +150,11 @@ public class CommandListenerWrapper implements ICompletionProvider, com.destroys
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@Override
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public boolean hasPermission(int i) {
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// CraftBukkit start
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- CommandNode currentCommand = this.currentCommand;
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+ // Paper start - fix concurrency issue
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+ CommandNode currentCommand = this.currentCommand.get();
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if (currentCommand != null) {
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return hasPermission(i, org.bukkit.craftbukkit.command.VanillaCommandWrapper.getPermission(currentCommand));
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+ // Paper end
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}
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// CraftBukkit end
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