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Paper/patches/server/1034-Add-proper-async-player-disconnections.patch

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Add proper async player disconnections Blocking can cause performance problems
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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
Rework async chunk api implementation Firstly, the old methods all routed to the CompletableFuture method. However, the CF method could not guarantee that if the caller was off-main that the future would be "completed" on-main. Since the callback methods used the CF one, this meant that the callback methods did not guarantee that the callbacks were to be called on the main thread. Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb) so that the methods with the callback are guaranteed to invoke the callback on the main thread. The CF behavior remains unchanged; it may still appear to complete on main if invoked off-main. Secondly, remove the scheduleOnMain invocation in the async chunk completion. This unnecessarily delays the callback by 1 tick. Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which will load chunks within an area. This method is provided as a helper as keeping all chunks loaded within an area can be complicated to implement for plugins (due to the lacking ticket API), and is already implemented internally anyways. Fourthly, remove the ticket addition that occured with getChunkAt and getChunkAtAsync. The ticket addition may delay the unloading of the chunk unnecessarily. It also fixes a very rare timing bug where the future/callback would be completed after the chunk unloads.
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index 36624d3dc7e3f2a64f88b01c5e906018fcee0015..d18af548fa6e979267347443b61efc58b271dfcf 100644
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--- a/src/main/java/net/minecraft/network/Connection.java
+++ b/src/main/java/net/minecraft/network/Connection.java
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@@ -844,6 +844,14 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
Add proper async player disconnections Blocking can cause performance problems
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}
+ // 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
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index fc242acade3ff06c9213428cde103cf078216382..b0bc66dc7248aae691dcab68b925b52a1695e63f 100644
Add proper async player disconnections Blocking can cause performance problems
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--- a/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerCommonPacketListenerImpl.java
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@@ -143,11 +143,7 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack
Add proper async player disconnections Blocking can cause performance problems
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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
}
}
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@@ -411,6 +407,31 @@ public abstract class ServerCommonPacketListenerImpl implements ServerCommonPack
Add proper async player disconnections Blocking can cause performance problems
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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
Only expose velocity relative tp flags to API (#11532) Since 1.21.2, vanilla split relative teleportation flags into position and delta/velocity flags into separate enum entries. This highlighted a design flaw in the paper api addition for teleport flags, which just simply mirrored internals while also only being able to apply the delta/velocity part of a flag, given the teleport target is always absolute in the API. This patch proposes to simply no longer expose the non-velocity related flags to the API, instead marking the entire Relative enum as being purely velocity related, as non-velocity related flags are not useful to callers. This was done over simply exposing all internal flags, as another vanilla change to the internal enum would result in the same breakage. The newly proposed API *only* promises that the passed flags prevent the loss of velocity in the specific axis/context, which should be independent enough of vanillas specific implementation of this feature.
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index fc64c09f466e6a0fb3eb6aa47f28f90748e81ce6..e3458038d56b7133f991a5198db26398a299bf30 100644
Add proper async player disconnections Blocking can cause performance problems
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--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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@@ -769,7 +769,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
Add proper async player disconnections Blocking can cause performance problems
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// PacketUtils.ensureRunningOnSameThread(packet, this, this.player.serverLevel()); // Paper - AsyncTabCompleteEvent; run this async
// CraftBukkit start
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if (!this.tabSpamThrottler.isIncrementAndUnderThreshold() && !this.server.getPlayerList().isOp(this.player.getGameProfile()) && !this.server.isSingleplayerOwner(this.player.getGameProfile())) { // Paper - configurable tab spam limits
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- 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
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@@ -781,7 +781,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
Add proper async player disconnections Blocking can cause performance problems
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// 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
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@@ -1171,14 +1171,14 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
Add proper async player disconnections Blocking can cause performance problems
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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;
Only expose velocity relative tp flags to API (#11532) Since 1.21.2, vanilla split relative teleportation flags into position and delta/velocity flags into separate enum entries. This highlighted a design flaw in the paper api addition for teleport flags, which just simply mirrored internals while also only being able to apply the delta/velocity part of a flag, given the teleport target is always absolute in the API. This patch proposes to simply no longer expose the non-velocity related flags to the API, instead marking the entire Relative enum as being purely velocity related, as non-velocity related flags are not useful to callers. This was done over simply exposing all internal flags, as another vanilla change to the internal enum would result in the same breakage. The newly proposed API *only* promises that the passed flags prevent the loss of velocity in the specific axis/context, which should be independent enough of vanillas specific implementation of this feature.
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@@ -2305,7 +2305,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
Add proper async player disconnections Blocking can cause performance problems
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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 {
Only expose velocity relative tp flags to API (#11532) Since 1.21.2, vanilla split relative teleportation flags into position and delta/velocity flags into separate enum entries. This highlighted a design flaw in the paper api addition for teleport flags, which just simply mirrored internals while also only being able to apply the delta/velocity part of a flag, given the teleport target is always absolute in the API. This patch proposes to simply no longer expose the non-velocity related flags to the API, instead marking the entire Relative enum as being purely velocity related, as non-velocity related flags are not useful to callers. This was done over simply exposing all internal flags, as another vanilla change to the internal enum would result in the same breakage. The newly proposed API *only* promises that the passed flags prevent the loss of velocity in the specific axis/context, which should be independent enough of vanillas specific implementation of this feature.
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@@ -2328,7 +2328,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
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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;
Only expose velocity relative tp flags to API (#11532) Since 1.21.2, vanilla split relative teleportation flags into position and delta/velocity flags into separate enum entries. This highlighted a design flaw in the paper api addition for teleport flags, which just simply mirrored internals while also only being able to apply the delta/velocity part of a flag, given the teleport target is always absolute in the API. This patch proposes to simply no longer expose the non-velocity related flags to the API, instead marking the entire Relative enum as being purely velocity related, as non-velocity related flags are not useful to callers. This was done over simply exposing all internal flags, as another vanilla change to the internal enum would result in the same breakage. The newly proposed API *only* promises that the passed flags prevent the loss of velocity in the specific axis/context, which should be independent enough of vanillas specific implementation of this feature.
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@@ -2499,7 +2499,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
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// this.chatSpamThrottler.increment();
Compiler issues v2
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if (!this.chatSpamThrottler.isIncrementAndUnderThreshold() && !this.server.getPlayerList().isOp(this.player.getGameProfile()) && !this.server.isSingleplayerOwner(this.player.getGameProfile())) {
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// 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
}
}
Only expose velocity relative tp flags to API (#11532) Since 1.21.2, vanilla split relative teleportation flags into position and delta/velocity flags into separate enum entries. This highlighted a design flaw in the paper api addition for teleport flags, which just simply mirrored internals while also only being able to apply the delta/velocity part of a flag, given the teleport target is always absolute in the API. This patch proposes to simply no longer expose the non-velocity related flags to the API, instead marking the entire Relative enum as being purely velocity related, as non-velocity related flags are not useful to callers. This was done over simply exposing all internal flags, as another vanilla change to the internal enum would result in the same breakage. The newly proposed API *only* promises that the passed flags prevent the loss of velocity in the specific axis/context, which should be independent enough of vanillas specific implementation of this feature.
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@@ -2511,7 +2511,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
Add proper async player disconnections Blocking can cause performance problems
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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
}
}
Only expose velocity relative tp flags to API (#11532) Since 1.21.2, vanilla split relative teleportation flags into position and delta/velocity flags into separate enum entries. This highlighted a design flaw in the paper api addition for teleport flags, which just simply mirrored internals while also only being able to apply the delta/velocity part of a flag, given the teleport target is always absolute in the API. This patch proposes to simply no longer expose the non-velocity related flags to the API, instead marking the entire Relative enum as being purely velocity related, as non-velocity related flags are not useful to callers. This was done over simply exposing all internal flags, as another vanilla change to the internal enum would result in the same breakage. The newly proposed API *only* promises that the passed flags prevent the loss of velocity in the specific axis/context, which should be independent enough of vanillas specific implementation of this feature.
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@@ -2659,7 +2659,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
Add proper async player disconnections Blocking can cause performance problems
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}
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
}
}
Only expose velocity relative tp flags to API (#11532) Since 1.21.2, vanilla split relative teleportation flags into position and delta/velocity flags into separate enum entries. This highlighted a design flaw in the paper api addition for teleport flags, which just simply mirrored internals while also only being able to apply the delta/velocity part of a flag, given the teleport target is always absolute in the API. This patch proposes to simply no longer expose the non-velocity related flags to the API, instead marking the entire Relative enum as being purely velocity related, as non-velocity related flags are not useful to callers. This was done over simply exposing all internal flags, as another vanilla change to the internal enum would result in the same breakage. The newly proposed API *only* promises that the passed flags prevent the loss of velocity in the specific axis/context, which should be independent enough of vanillas specific implementation of this feature.
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@@ -3268,7 +3268,7 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
Add proper async player disconnections Blocking can cause performance problems
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// Paper start - auto recipe limit
if (!org.bukkit.Bukkit.isPrimaryThread()) {
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if (!this.recipeSpamPackets.isIncrementAndUnderThreshold()) {
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- 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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