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PaperMC/patches/server/0394-Buffer-joins-to-world.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Wed, 19 Aug 2020 05:05:54 +0100
Subject: [PATCH] Buffer joins to world
This patch buffers the number of logins which will attempt to join
the world per tick, this attempts to reduce the impact that join floods
has on the server
diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
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index e9429b3b1db612aa552237fe5d0c37727501ff8d..f9158826f16e45c81714c2e0a284828bc5bb95c8 100644
--- a/src/main/java/net/minecraft/network/Connection.java
+++ b/src/main/java/net/minecraft/network/Connection.java
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@@ -445,12 +445,26 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
}
}
+ private static final int MAX_PER_TICK = io.papermc.paper.configuration.GlobalConfiguration.get().misc.maxJoinsPerTick; // Paper - Buffer joins to world
+ private static int joinAttemptsThisTick; // Paper - Buffer joins to world
+ private static int currTick; // Paper - Buffer joins to world
public void tick() {
this.flushQueue();
+ // Paper start - Buffer joins to world
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+ if (Connection.currTick != net.minecraft.server.MinecraftServer.currentTick) {
+ Connection.currTick = net.minecraft.server.MinecraftServer.currentTick;
+ Connection.joinAttemptsThisTick = 0;
+ }
+ // Paper end - Buffer joins to world
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PacketListener packetlistener = this.packetListener;
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if (packetlistener instanceof TickablePacketListener tickablepacketlistener) {
+ // Paper start - Buffer joins to world
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+ if (!(this.packetListener instanceof net.minecraft.server.network.ServerLoginPacketListenerImpl loginPacketListener)
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+ || loginPacketListener.state != net.minecraft.server.network.ServerLoginPacketListenerImpl.State.VERIFYING
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+ || Connection.joinAttemptsThisTick++ < MAX_PER_TICK) {
tickablepacketlistener.tick();
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+ } // Paper end - Buffer joins to world
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}
if (!this.isConnected() && !this.disconnectionHandled) {