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41647af74c
We cannot put blocking network I/O onto the worldgen threads, this will crash the server if it stalls
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 a4f97c1df86c574af9b9824a38034a3d76d6e357..d65defd5fc54086a969c568b93dfb05f40dd5a44 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.put(Thread.currentThread(), 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.remove(Thread.currentThread()); // 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 0b8d8b9875acf4c0a6bd47941ff57d01285dd507..3ad9f1327cd99e16e8eca86d72cb8a57f28b245e 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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@@ -55,7 +55,7 @@ public class CommandSourceStack implements SharedSuggestionProvider, com.destroy
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private final EntityAnchorArgument.Anchor anchor;
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private final Vec2 rotation;
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private final CommandSigningContext signingContext;
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- public volatile CommandNode currentCommand; // CraftBukkit
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+ public java.util.Map<Thread, CommandNode> currentCommand = new java.util.concurrent.ConcurrentHashMap<>(); // CraftBukkit // Paper
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public CommandSourceStack(CommandSource output, Vec3 pos, Vec2 rot, ServerLevel world, int level, String name, Component displayName, MinecraftServer server, @Nullable Entity entity) {
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this(output, pos, rot, world, level, name, displayName, server, entity, false, (commandcontext, flag, j) -> {
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@@ -185,9 +185,11 @@ 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(Thread.currentThread());
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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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