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This commit is contained in:
Nassim Jahnke
2021-06-13 11:41:07 +02:00
parent bda639725b
commit 43227a418f
19 changed files with 399 additions and 800 deletions
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patches/server/Optimize-Network-Manager-and-add-advanced-packet-sup.patch Normal file
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@@ -0,0 +1,299 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 6 May 2020 04:53:35 -0400
Subject: [PATCH] Optimize Network Manager and add advanced packet support
Adds ability for 1 packet to bundle other packets to follow it
Adds ability for a packet to delay sending more packets until a state is ready.
Removes synchronization from sending packets
Removes processing packet queue off of main thread
- for the few cases where it is allowed, order is not necessary nor
should it even be happening concurrently in first place (handshaking/login/status)
Ensures packets sent asynchronously are dispatched on main thread
This helps ensure safety for ProtocolLib as packet listeners
are commonly accessing world state. This will allow you to schedule
a packet to be sent async, but itll be dispatched sync for packet
listeners to process.
This should solve some deadlock risks
Also adds Netty Channel Flush Consolidation to reduce the amount of flushing
Also avoids spamming closed channel exception by rechecking closed state in dispatch
and then catch exceptions and close if they fire.
Part of this commit was authored by: Spottedleaf
diff --git a/src/main/java/net/minecraft/network/Connection.java b/src/main/java/net/minecraft/network/Connection.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/network/Connection.java
+++ b/src/main/java/net/minecraft/network/Connection.java
@@ -0,0 +0,0 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
public int protocolVersion;
public java.net.InetSocketAddress virtualHost;
private static boolean enableExplicitFlush = Boolean.getBoolean("paper.explicit-flush");
+ // Optimize network
+ public boolean isPending = true;
+ public boolean queueImmunity = false;
+ public ConnectionProtocol protocol;
// Paper end
public Connection(PacketFlow side) {
@@ -0,0 +0,0 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
}
public void setProtocol(ConnectionProtocol state) {
+ protocol = state; // Paper
this.channel.attr(Connection.ATTRIBUTE_PROTOCOL).set(state);
this.channel.config().setAutoRead(true);
Connection.LOGGER.debug("Enabled auto read");
@@ -0,0 +0,0 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
Validate.notNull(listener, "packetListener", new Object[0]);
this.packetListener = listener;
}
+ // Paper start
+ public net.minecraft.server.level.ServerPlayer getPlayer() {
+ if (packetListener instanceof ServerGamePacketListenerImpl) {
+ return ((ServerGamePacketListenerImpl) packetListener).player;
+ } else {
+ return null;
+ }
+ }
+ private static class InnerUtil { // Attempt to hide these methods from ProtocolLib so it doesn't accidently pick them up.
+ private static java.util.List<Packet> buildExtraPackets(Packet packet) {
+ java.util.List<Packet> extra = packet.getExtraPackets();
+ if (extra == null || extra.isEmpty()) {
+ return null;
+ }
+ java.util.List<Packet> ret = new java.util.ArrayList<>(1 + extra.size());
+ buildExtraPackets0(extra, ret);
+ return ret;
+ }
+
+ private static void buildExtraPackets0(java.util.List<Packet> extraPackets, java.util.List<Packet> into) {
+ for (Packet extra : extraPackets) {
+ into.add(extra);
+ java.util.List<Packet> extraExtra = extra.getExtraPackets();
+ if (extraExtra != null && !extraExtra.isEmpty()) {
+ buildExtraPackets0(extraExtra, into);
+ }
+ }
+ }
+ // Paper start
+ private static boolean canSendImmediate(Connection networkManager, Packet<?> packet) {
+ return networkManager.isPending || networkManager.protocol != ConnectionProtocol.PLAY ||
+ packet instanceof net.minecraft.network.protocol.game.ClientboundKeepAlivePacket ||
+ packet instanceof net.minecraft.network.protocol.game.ClientboundChatPacket ||
+ packet instanceof net.minecraft.network.protocol.game.ClientboundCommandSuggestionsPacket ||
+ packet instanceof net.minecraft.network.protocol.game.ClientboundSetTitleTextPacket ||
+ packet instanceof net.minecraft.network.protocol.game.ClientboundSetSubtitleTextPacket ||
+ packet instanceof net.minecraft.network.protocol.game.ClientboundSetActionBarTextPacket ||
+ packet instanceof net.minecraft.network.protocol.game.ClientboundSetTitlesAnimationPacket ||
+ packet instanceof net.minecraft.network.protocol.game.ClientboundClearTitlesPacket ||
+ packet instanceof net.minecraft.network.protocol.game.ClientboundBossEventPacket;
+ }
+ // Paper end
+ }
+ // Paper end
public void send(Packet<?> packet) {
this.send(packet, (GenericFutureListener) null);
}
public void send(Packet<?> packet, @Nullable GenericFutureListener<? extends Future<? super Void>> callback) {
- if (this.isConnected()) {
- this.flushQueue();
- this.sendPacket(packet, callback);
- } else {
- this.queue.add(new Connection.PacketHolder(packet, callback));
+ // Paper start - handle oversized packets better
+ boolean connected = this.isConnected();
+ if (!connected && !preparing) {
+ return; // Do nothing
+ }
+ packet.onPacketDispatch(getPlayer());
+ if (connected && (InnerUtil.canSendImmediate(this, packet) || (
+ net.minecraft.server.MCUtil.isMainThread() && packet.isReady() && this.queue.isEmpty() &&
+ (packet.getExtraPackets() == null || packet.getExtraPackets().isEmpty())
+ ))) {
+ this.send(packet, callback);
+ return;
}
+ // write the packets to the queue, then flush - antixray hooks there already
+ java.util.List<Packet> extraPackets = InnerUtil.buildExtraPackets(packet);
+ boolean hasExtraPackets = extraPackets != null && !extraPackets.isEmpty();
+ if (!hasExtraPackets) {
+ this.queue.add(new Connection.PacketHolder(packet, callback));
+ } else {
+ java.util.List<Connection.PacketHolder> packets = new java.util.ArrayList<>(1 + extraPackets.size());
+ packets.add(new Connection.PacketHolder(packet, null)); // delay the future listener until the end of the extra packets
+ for (int i = 0, len = extraPackets.size(); i < len;) {
+ Packet extra = extraPackets.get(i);
+ boolean end = ++i == len;
+ packets.add(new Connection.PacketHolder(extra, end ? callback : null)); // append listener to the end
+ }
+ this.queue.addAll(packets); // atomic
+ }
+ this.flushQueue();
+ // Paper end
}
private void sendPacket(Packet<?> packet, @Nullable GenericFutureListener<? extends Future<? super Void>> callback) {
@@ -0,0 +0,0 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
this.setProtocol(enumprotocol);
}
+ // Paper start
+ net.minecraft.server.level.ServerPlayer player = getPlayer();
+ if (!isConnected()) {
+ packet.onPacketDispatchFinish(player, null);
+ return;
+ }
+
+ try {
+ // Paper end
ChannelFuture channelfuture = this.channel.writeAndFlush(packet);
if (genericfuturelistener != null) {
channelfuture.addListener(genericfuturelistener);
}
+ // Paper start
+ if (packet.hasFinishListener()) {
+ channelfuture.addListener((ChannelFutureListener) channelFuture -> packet.onPacketDispatchFinish(player, channelFuture));
+ }
+ // Paper end
channelfuture.addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
+ // Paper start
+ } catch (Exception e) {
+ LOGGER.error("NetworkException: " + player, e);
+ disconnect(new net.minecraft.network.chat.TranslatableComponent("disconnect.genericReason", "Internal Exception: " + e.getMessage()));
+ packet.onPacketDispatchFinish(player, null);
+ }
+ // Paper end
}
private ConnectionProtocol getCurrentProtocol() {
return (ConnectionProtocol) this.channel.attr(Connection.ATTRIBUTE_PROTOCOL).get();
}
- private void flushQueue() {
- if (this.channel != null && this.channel.isOpen()) {
- Queue queue = this.queue;
-
+ // Paper start - rewrite this to be safer if ran off main thread
+ private boolean flushQueue() { // void -> boolean
+ if (!isConnected()) {
+ return true;
+ }
+ if (net.minecraft.server.MCUtil.isMainThread()) {
+ return processQueue();
+ } else if (isPending) {
+ // Should only happen during login/status stages
synchronized (this.queue) {
- Connection.PacketHolder networkmanager_queuedpacket;
-
- while ((networkmanager_queuedpacket = (Connection.PacketHolder) this.queue.poll()) != null) {
- this.sendPacket(networkmanager_queuedpacket.packet, networkmanager_queuedpacket.listener);
- }
+ return this.processQueue();
+ }
+ }
+ return false;
+ }
+ private boolean processQueue() {
+ if (this.queue.isEmpty()) return true;
+ // If we are on main, we are safe here in that nothing else should be processing queue off main anymore
+ // But if we are not on main due to login/status, the parent is synchronized on packetQueue
+ java.util.Iterator<PacketHolder> iterator = this.queue.iterator();
+ while (iterator.hasNext()) {
+ PacketHolder queued = iterator.next(); // poll -> peek
+
+ // Fix NPE (Spigot bug caused by handleDisconnection())
+ if (queued == null) {
+ return true;
+ }
+ Packet<?> packet = queued.packet;
+ if (!packet.isReady()) {
+ return false;
+ } else {
+ iterator.remove();
+ this.sendPacket(packet, queued.listener);
}
}
+ return true;
}
+ // Paper end
public void tick() {
this.flushQueue();
@@ -0,0 +0,0 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
return this.address;
}
+ // Paper start
+ public void clearPacketQueue() {
+ net.minecraft.server.level.ServerPlayer player = getPlayer();
+ queue.forEach(queuedPacket -> {
+ Packet<?> packet = queuedPacket.packet;
+ if (packet.hasFinishListener()) {
+ packet.onPacketDispatchFinish(player, null);
+ }
+ });
+ queue.clear();
+ }
+ // Paper end
public void disconnect(Component disconnectReason) {
// Spigot Start
this.preparing = false;
+ clearPacketQueue(); // Paper
// Spigot End
if (this.channel.isOpen()) {
this.channel.close(); // We can't wait as this may be called from an event loop.
@@ -0,0 +0,0 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
public void handleDisconnection() {
if (this.channel != null && !this.channel.isOpen()) {
if (this.disconnectionHandled) {
- Connection.LOGGER.warn("handleDisconnection() called twice");
+ //Connection.LOGGER.warn("handleDisconnection() called twice"); // Paper - Do not log useless message
} else {
this.disconnectionHandled = true;
if (this.getDisconnectedReason() != null) {
@@ -0,0 +0,0 @@ public class Connection extends SimpleChannelInboundHandler<Packet<?>> {
} else if (this.getPacketListener() != null) {
this.getPacketListener().onDisconnect(new TranslatableComponent("multiplayer.disconnect.generic"));
}
- this.queue.clear(); // Free up packet queue.
+ clearPacketQueue(); // Paper
// Paper start - Add PlayerConnectionCloseEvent
final PacketListener packetListener = this.getPacketListener();
if (packetListener instanceof ServerGamePacketListenerImpl) {
diff --git a/src/main/java/net/minecraft/network/protocol/Packet.java b/src/main/java/net/minecraft/network/protocol/Packet.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/network/protocol/Packet.java
+++ b/src/main/java/net/minecraft/network/protocol/Packet.java
@@ -0,0 +0,0 @@ public interface Packet<T extends PacketListener> {
void handle(T listener);
// Paper start
+ /**
+ * @param player Null if not at PLAY stage yet
+ */
+ default void onPacketDispatch(@javax.annotation.Nullable net.minecraft.server.level.ServerPlayer player) {}
+
+ /**
+ * @param player Null if not at PLAY stage yet
+ * @param future Can be null if packet was cancelled
+ */
+ default void onPacketDispatchFinish(@javax.annotation.Nullable net.minecraft.server.level.ServerPlayer player, @javax.annotation.Nullable io.netty.channel.ChannelFuture future) {}
+ default boolean hasFinishListener() { return false; }
+ default boolean isReady() { return true; }
+ default java.util.List<Packet> getExtraPackets() { return null; }
default boolean packetTooLarge(net.minecraft.network.Connection manager) {
return false;
}