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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.
48 lines
3.0 KiB
Diff
48 lines
3.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Shane Freeder <theboyetronic@gmail.com>
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Date: Sun, 18 Sep 2022 06:33:17 +0100
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Subject: [PATCH] Configurable chat thread limit
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By default, spigot shifts chat over to an unbounded thread pool,
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on a normal server, this really offers no gains, the creation of a thread
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on submitting to the pool on these servers eats more time vs just running it in
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the netty pipeline, however, on servers using plugins which do work in here, there
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could be some overall benefits to moving this stuff outside of the pipeline.
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In general, this patch does two things:
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1) Exposes the core size for the pool, this allows for ensuring that a number of threads
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sit around in the pool, mitigating the need for creating new threads; This IS however
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caveated, the ThreadPoolExecutor will ONLY create core threads as they're needed, it
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just won't allow for us to dip back under the # of core threads, this can potentially
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be mitigated by calling prestartCoreThread, however, I'm not sure if there is much justification
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for this
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2) Exposes a max size for the pool, as stated, by default this is unbounded, for most
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servers limiting the size of the pool is going to have 0 effects given how fast chat
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is actually processed, this is honestly really just exposed for the misnomers or people
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who just wanna ensure that this won't grow over a specific size if chat gets stupidly active
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diff --git a/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java b/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java
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index 7a53374319d5495253f277199114eaf43097456d..7145c3776c85416240408b8e23a1d949da39bad9 100644
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--- a/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java
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+++ b/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java
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@@ -285,7 +285,18 @@ public class GlobalConfiguration extends ConfigurationPart {
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@PostProcess
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private void postProcess() {
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- // TODO: fill in separate patch
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+ //noinspection ConstantConditions
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+ if (net.minecraft.server.MinecraftServer.getServer() == null) return; // In testing env, this will be null here
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+ int _chatExecutorMaxSize = (this.chatExecutorMaxSize <= 0) ? Integer.MAX_VALUE : this.chatExecutorMaxSize; // This is somewhat dumb, but, this is the default, do we cap this?;
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+ int _chatExecutorCoreSize = Math.max(this.chatExecutorCoreSize, 0);
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+
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+ if (_chatExecutorMaxSize < _chatExecutorCoreSize) {
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+ _chatExecutorMaxSize = _chatExecutorCoreSize;
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+ }
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+
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+ java.util.concurrent.ThreadPoolExecutor executor = (java.util.concurrent.ThreadPoolExecutor) net.minecraft.server.MinecraftServer.getServer().chatExecutor;
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+ executor.setCorePoolSize(_chatExecutorCoreSize);
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+ executor.setMaximumPoolSize(_chatExecutorMaxSize);
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}
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}
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public int maxJoinsPerTick = 5;
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