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"It was from a different time before books were as jank as they are now. As time has gone on they've only proven to be worse and worse."
54 lines
3.0 KiB
Diff
54 lines
3.0 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 aa3a1795850a419f624f14bd7c4daab0020779d0..39708be1b445791b053023dec16ad7d4efcc9048 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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@@ -74,10 +74,10 @@ 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 CommandSourceStack) {
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try {
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- ((CommandSourceStack) source).currentCommand = this;
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+ ((CommandSourceStack) source).currentCommand.set(this); // Paper
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return this.requirement.test(source);
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} finally {
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- ((CommandSourceStack) source).currentCommand = null;
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+ ((CommandSourceStack) 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/commands/CommandSourceStack.java b/src/main/java/net/minecraft/commands/CommandSourceStack.java
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index 42d97bc67c8f4e5b65a81159179c43dc6edc804c..6a330170ec1ea9d06593a1bbd1bdb8d98c0904fb 100644
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--- a/src/main/java/net/minecraft/commands/CommandSourceStack.java
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+++ b/src/main/java/net/minecraft/commands/CommandSourceStack.java
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@@ -54,7 +54,7 @@ public class CommandSourceStack implements SharedSuggestionProvider, com.destroy
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private final ResultConsumer<CommandSourceStack> consumer;
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private final EntityAnchorArgument.Anchor anchor;
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private final Vec2 rotation;
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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 CommandSourceStack(CommandSource output, Vec3 pos, Vec2 rot, ServerLevel world, int level, String simpleName, Component name, MinecraftServer server, @Nullable Entity entity) {
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this(output, pos, rot, world, level, simpleName, name, server, entity, false, (commandcontext, flag, j) -> {
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@@ -175,9 +175,11 @@ public class CommandSourceStack implements SharedSuggestionProvider, com.destroy
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@Override
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public boolean hasPermission(int level) {
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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 this.hasPermission(level, 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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