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Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable. It should be noted that this decision does not promise all future exploits will be configurable.
35 lines
1.8 KiB
Diff
35 lines
1.8 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: Mon, 21 Dec 2020 11:01:42 -0500
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Subject: [PATCH] Optimize Dynamic#get Missing Keys
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get was calling toString() on every NBT object that was ever asked for an optional
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key from the object to build a string for the error text.
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When done on large NBT objects, this was using a ton of computation time building the
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JSON representation of the NBT object.
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Now we will just skip the value when 99.9999% of the time the text is never even printed.
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diff --git a/src/main/java/com/mojang/serialization/Dynamic.java b/src/main/java/com/mojang/serialization/Dynamic.java
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index a24cc02a62585d7c04d36456739b11bddccf1a15..984e41619230db4579b028af18670c471aa13096 100644
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--- a/src/main/java/com/mojang/serialization/Dynamic.java
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+++ b/src/main/java/com/mojang/serialization/Dynamic.java
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@@ -17,6 +17,7 @@ import java.util.stream.Stream;
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@SuppressWarnings("unused")
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public class Dynamic<T> extends DynamicLike<T> {
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+ private static final boolean DEBUG_MISSING_KEYS = Boolean.getBoolean("Paper.debugDynamicMissingKeys"); // Paper - Perf: Skip toString on values like NBT
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private final T value;
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public Dynamic(final DynamicOps<T> ops) {
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@@ -113,7 +114,7 @@ public class Dynamic<T> extends DynamicLike<T> {
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return new OptionalDynamic<>(ops, ops.getMap(value).flatMap(m -> {
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final T value = m.get(key);
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if (value == null) {
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- return DataResult.error(() -> "key missing: " + key + " in " + this.value);
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+ return DataResult.error(() -> DEBUG_MISSING_KEYS ? "key missing: " + key + " in " + this.value : "key missing: " + key); // Paper - Perf: Skip toString on values like NBT
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}
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return DataResult.success(new Dynamic<>(ops, value));
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}));
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