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Paper/patches/server/1067-Add-proper-async-player-disconnections.patch
Spottedleaf aebbdc9e9a Add proper async player disconnections 
Blocking can cause performance problems
2024-10-16 07:00:40 -07:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Wed, 16 Oct 2024 06:41:32 -0700
Subject: [PATCH] Add proper async player disconnections
Blocking can cause performance problems
diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
index 3e550f8e7cd4f4e16f499a8a2a4b95420270f07a..4a8356a714ed50d4a32bcf046a2e16491bef014b 100644
--- a/src/main/java/net/minecraft/network/Connection.java
+++ b/src/main/java/net/minecraft/network/Connection.java
@@ -850,6 +850,14 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
}
+ // Paper start - add proper async disconnect
+ public void enableAutoRead() {
+ if (this.channel != null) {
+ this.channel.config().setAutoRead(true);
+ }
+ }
+ // Paper end - add proper async disconnect
+
public void setupCompression(int compressionThreshold, boolean rejectsBadPackets) {
if (compressionThreshold >= 0) {
com.velocitypowered.natives.compression.VelocityCompressor compressor = com.velocitypowered.natives.util.Natives.compress.get().create(io.papermc.paper.configuration.GlobalConfiguration.get().misc.compressionLevel.or(-1)); // Paper - Use Velocity cipher
diff --git a/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
index 6998f32f8d79dbdb6b31ffaa126602fc4a428616..7174f8c89a7cdcf40ff28f6636ecfb23b13ccdaa 100644
--- a/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
@@ -136,11 +136,7 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack
this.latency = (this.latency * 3 + i) / 4;
this.keepAlivePending = false;
} else if (!this.isSingleplayerOwner()) {
- // Paper start - This needs to be handled on the main thread for plugins
- server.submit(() -> {
- this.disconnect(ServerCommonPacketListenerImpl.TIMEOUT_DISCONNECTION_MESSAGE, PlayerKickEvent.Cause.TIMEOUT); // Paper - kick event cause
- });
- // Paper end - This needs to be handled on the main thread for plugins
+ this.disconnectAsync(ServerCommonPacketListenerImpl.TIMEOUT_DISCONNECTION_MESSAGE, PlayerKickEvent.Cause.TIMEOUT); // Paper - add proper async disconnect
}
}
@@ -404,6 +400,31 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack
minecraftserver.scheduleOnMain(networkmanager::handleDisconnection); // Paper
}
+ // Paper start - add proper async disconnect
+ public void disconnectAsync(net.kyori.adventure.text.Component reason, PlayerKickEvent.Cause cause) {
+ this.disconnectAsync(io.papermc.paper.adventure.PaperAdventure.asVanilla(reason), cause);
+ }
+
+ public void disconnectAsync(Component reason, PlayerKickEvent.Cause cause) {
+ this.disconnectAsync(new DisconnectionDetails(reason), cause);
+ }
+
+ public void disconnectAsync(DisconnectionDetails disconnectionInfo, PlayerKickEvent.Cause cause) {
+ if (this.cserver.isPrimaryThread()) {
+ this.disconnect(disconnectionInfo, cause);
+ return;
+ }
+ this.connection.setReadOnly();
+ this.server.scheduleOnMain(() -> {
+ ServerCommonPacketListenerImpl.this.disconnect(disconnectionInfo, cause);
+ if (ServerCommonPacketListenerImpl.this.player.quitReason == null) {
+ // cancelled
+ ServerCommonPacketListenerImpl.this.connection.enableAutoRead();
+ }
+ });
+ }
+ // Paper end - add proper async disconnect
+
protected boolean isSingleplayerOwner() {
return this.server.isSingleplayerOwner(this.playerProfile());
}
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index befeaac4786760f6847a5945da2296a3e68dbb17..064d52d4479727c6a32bf357be8da32d1760e7fc 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -791,7 +791,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
// PacketUtils.ensureRunningOnSameThread(packet, this, this.player.serverLevel()); // Paper - AsyncTabCompleteEvent; run this async
// CraftBukkit start
if (this.chatSpamTickCount.addAndGet(io.papermc.paper.configuration.GlobalConfiguration.get().spamLimiter.tabSpamIncrement) > io.papermc.paper.configuration.GlobalConfiguration.get().spamLimiter.tabSpamLimit && !this.server.getPlayerList().isOp(this.player.getGameProfile())) { // Paper - configurable tab spam limits
- this.disconnect(Component.translatable("disconnect.spam"), org.bukkit.event.player.PlayerKickEvent.Cause.SPAM); // Paper - Kick event cause
+ this.disconnectAsync(Component.translatable("disconnect.spam"), org.bukkit.event.player.PlayerKickEvent.Cause.SPAM); // Paper - Kick event cause // Paper - add proper async disconnect
return;
}
// CraftBukkit end
@@ -803,7 +803,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
// Paper start
final int index;
if (packet.getCommand().length() > 64 && ((index = packet.getCommand().indexOf(' ')) == -1 || index >= 64)) {
- this.disconnect(Component.translatable("disconnect.spam"), org.bukkit.event.player.PlayerKickEvent.Cause.SPAM);
+ this.disconnectAsync(Component.translatable("disconnect.spam"), org.bukkit.event.player.PlayerKickEvent.Cause.SPAM); // Paper - add proper async disconnect
return;
}
// Paper end
@@ -1190,14 +1190,14 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
if (byteTotal > byteAllowed) {
ServerGamePacketListenerImpl.LOGGER.warn("{} tried to send a book too large. Book size: {} - Allowed: {} - Pages: {}", this.player.getScoreboardName(), byteTotal, byteAllowed, pageList.size());
- this.disconnect(Component.literal("Book too large!"), org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_ACTION); // Paper - kick event cause
+ this.disconnectAsync(Component.literal("Book too large!"), org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_ACTION); // Paper - kick event cause // Paper - add proper async disconnect
return;
}
}
// Paper end - Book size limits
// CraftBukkit start
if (this.lastBookTick + 20 > MinecraftServer.currentTick) {
- this.disconnect(Component.literal("Book edited too quickly!"), org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_ACTION); // Paper - kick event cause
+ this.disconnectAsync(Component.literal("Book edited too quickly!"), org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_ACTION); // Paper - kick event cause // Paper - add proper async disconnect
return;
}
this.lastBookTick = MinecraftServer.currentTick;
@@ -2354,7 +2354,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
private void tryHandleChat(String s, Runnable runnable, boolean sync) { // CraftBukkit
if (ServerGamePacketListenerImpl.isChatMessageIllegal(s)) {
- this.disconnect((Component) Component.translatable("multiplayer.disconnect.illegal_characters"), org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_CHARACTERS); // Paper
+ this.disconnectAsync((Component) Component.translatable("multiplayer.disconnect.illegal_characters"), org.bukkit.event.player.PlayerKickEvent.Cause.ILLEGAL_CHARACTERS); // Paper // Paper - add proper async disconnect
} else if (this.player.isRemoved() || this.player.getChatVisibility() == ChatVisiblity.HIDDEN) { // CraftBukkit - dead men tell no tales
this.send(new ClientboundSystemChatPacket(Component.translatable("chat.disabled.options").withStyle(ChatFormatting.RED), false));
} else {
@@ -2377,7 +2377,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
if (optional.isEmpty()) {
ServerGamePacketListenerImpl.LOGGER.warn("Failed to validate message acknowledgements from {}", this.player.getName().getString());
- this.disconnect(ServerGamePacketListenerImpl.CHAT_VALIDATION_FAILED, org.bukkit.event.player.PlayerKickEvent.Cause.CHAT_VALIDATION_FAILED); // Paper - kick event causes
+ this.disconnectAsync(ServerGamePacketListenerImpl.CHAT_VALIDATION_FAILED, org.bukkit.event.player.PlayerKickEvent.Cause.CHAT_VALIDATION_FAILED); // Paper - kick event causes // Paper - add proper async disconnect
}
return optional;
@@ -2550,7 +2550,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
// this.chatSpamTickCount += 20;
if (counted && this.chatSpamTickCount.addAndGet(20) > 200 && !this.server.getPlayerList().isOp(this.player.getGameProfile()) && !this.server.isSingleplayerOwner(this.player.getGameProfile())) { // Paper - exclude from SpigotConfig.spamExclusions
// CraftBukkit end
- this.disconnect((Component) Component.translatable("disconnect.spam"), org.bukkit.event.player.PlayerKickEvent.Cause.SPAM); // Paper - kick event cause
+ this.disconnectAsync((Component) Component.translatable("disconnect.spam"), org.bukkit.event.player.PlayerKickEvent.Cause.SPAM); // Paper - kick event cause // Paper - add proper async disconnect
}
}
@@ -2562,7 +2562,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
synchronized (this.lastSeenMessages) {
if (!this.lastSeenMessages.applyOffset(packet.offset())) {
ServerGamePacketListenerImpl.LOGGER.warn("Failed to validate message acknowledgements from {}", this.player.getName().getString());
- this.disconnect(ServerGamePacketListenerImpl.CHAT_VALIDATION_FAILED, org.bukkit.event.player.PlayerKickEvent.Cause.CHAT_VALIDATION_FAILED); // Paper - kick event causes
+ this.disconnectAsync(ServerGamePacketListenerImpl.CHAT_VALIDATION_FAILED, org.bukkit.event.player.PlayerKickEvent.Cause.CHAT_VALIDATION_FAILED); // Paper - kick event causes // Paper - add proper async disconnect
}
}
@@ -2710,7 +2710,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
}
if (i > 4096) {
- this.disconnect((Component) Component.translatable("multiplayer.disconnect.too_many_pending_chats"), org.bukkit.event.player.PlayerKickEvent.Cause.TOO_MANY_PENDING_CHATS); // Paper - kick event cause
+ this.disconnectAsync((Component) Component.translatable("multiplayer.disconnect.too_many_pending_chats"), org.bukkit.event.player.PlayerKickEvent.Cause.TOO_MANY_PENDING_CHATS); // Paper - kick event cause // Paper - add proper async disconnect
}
}
@@ -3314,7 +3314,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
// Paper start - auto recipe limit
if (!org.bukkit.Bukkit.isPrimaryThread()) {
if (this.recipeSpamPackets.addAndGet(io.papermc.paper.configuration.GlobalConfiguration.get().spamLimiter.recipeSpamIncrement) > io.papermc.paper.configuration.GlobalConfiguration.get().spamLimiter.recipeSpamLimit) {
- this.disconnect(net.minecraft.network.chat.Component.translatable("disconnect.spam"), org.bukkit.event.player.PlayerKickEvent.Cause.SPAM); // Paper - kick event cause
+ this.disconnectAsync(net.minecraft.network.chat.Component.translatable("disconnect.spam"), org.bukkit.event.player.PlayerKickEvent.Cause.SPAM); // Paper - kick event cause // Paper - add proper async disconnect
return;
}
}
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