From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Shane Freeder 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 index af4ded7a31da34ccebb3cfe9c1eb5d5c918950b1..b9d1eefb2afbf24bdc902c6dea06e911e835d698 100644 --- a/src/main/java/net/minecraft/network/Connection.java +++ b/src/main/java/net/minecraft/network/Connection.java @@ -498,14 +498,29 @@ public class Connection extends SimpleChannelInboundHandler> { } // Paper end - Optimize network + private static final int MAX_PER_TICK = io.papermc.paper.configuration.GlobalConfiguration.get().misc.maxJoinsPerTick; // Paper + private static int joinAttemptsThisTick; // Paper + private static int currTick; // Paper public void tick() { this.flushQueue(); + // Paper start + if (Connection.currTick != net.minecraft.server.MinecraftServer.currentTick) { + Connection.currTick = net.minecraft.server.MinecraftServer.currentTick; + Connection.joinAttemptsThisTick = 0; + } + // Paper end PacketListener packetlistener = this.packetListener; if (packetlistener instanceof TickablePacketListener) { TickablePacketListener tickablepacketlistener = (TickablePacketListener) packetlistener; + // Paper start - limit the number of joins which can be processed each tick + if (!(this.packetListener instanceof net.minecraft.server.network.ServerLoginPacketListenerImpl loginPacketListener) + || loginPacketListener.state != net.minecraft.server.network.ServerLoginPacketListenerImpl.State.VERIFYING + || Connection.joinAttemptsThisTick++ < MAX_PER_TICK) { tickablepacketlistener.tick(); + } + // Paper end } if (!this.isConnected() && !this.disconnectionHandled) {