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PaperMC/Spigot-Server-Patches/0330-Optimize-Network-Manager-and-add-advanced-packet-sup.patch
Mariell Hoversholm 654b792caf Updated Upstream (CraftBukkit) 
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

CraftBukkit Changes:
a339310c #755: Fix NPE when calling getInventory() for virtual EnderChests
2577f9bf Increase outdated build delay
1dabfdc8 #754: Fix pre-1.16 serialized SkullMeta being broken on 1.16+, losing textures
2020-09-27 11:04:51 -04:00

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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/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
index 8508f5f5136791ffcdf200f0087548ea636a9a7f..48fc9f40050685ea08af8da54ae8a00cf3d8ee36 100644
--- a/src/main/java/net/minecraft/server/NetworkManager.java
+++ b/src/main/java/net/minecraft/server/NetworkManager.java
@@ -65,6 +65,10 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
public int protocolVersion;
public java.net.InetSocketAddress virtualHost;
private static boolean enableExplicitFlush = Boolean.getBoolean("paper.explicit-flush");
+ // Optimize network
+ boolean isPending = true;
+ boolean queueImmunity = false;
+ EnumProtocol protocol;
// Paper end
public NetworkManager(EnumProtocolDirection enumprotocoldirection) {
@@ -88,6 +92,7 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
}
public void setProtocol(EnumProtocol enumprotocol) {
+ protocol = enumprotocol; // Paper
this.channel.attr(NetworkManager.c).set(enumprotocol);
this.channel.config().setAutoRead(true);
NetworkManager.LOGGER.debug("Enabled auto read");
@@ -158,19 +163,82 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
Validate.notNull(packetlistener, "packetListener", new Object[0]);
this.packetListener = packetlistener;
}
+ // Paper start
+ EntityPlayer getPlayer() {
+ if (packetListener instanceof PlayerConnection) {
+ return ((PlayerConnection) 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(NetworkManager networkManager, Packet<?> packet) {
+ return networkManager.isPending || networkManager.protocol != EnumProtocol.PLAY ||
+ packet instanceof PacketPlayOutKeepAlive ||
+ packet instanceof PacketPlayOutChat ||
+ packet instanceof PacketPlayOutTabComplete;
+ }
+ // Paper end
+ }
+ // Paper end
public void sendPacket(Packet<?> packet) {
this.sendPacket(packet, (GenericFutureListener) null);
}
public void sendPacket(Packet<?> packet, @Nullable GenericFutureListener<? extends Future<? super Void>> genericfuturelistener) {
- if (this.isConnected()) {
- this.p();
- this.b(packet, genericfuturelistener);
- } else {
- this.packetQueue.add(new NetworkManager.QueuedPacket(packet, genericfuturelistener));
+ // 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) || (
+ MCUtil.isMainThread() && packet.isReady() && this.packetQueue.isEmpty() &&
+ (packet.getExtraPackets() == null || packet.getExtraPackets().isEmpty())
+ ))) {
+ this.dispatchPacket(packet, genericfuturelistener);
+ 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.packetQueue.add(new NetworkManager.QueuedPacket(packet, genericfuturelistener));
+ } else {
+ java.util.List<NetworkManager.QueuedPacket> packets = new java.util.ArrayList<>(1 + extraPackets.size());
+ packets.add(new NetworkManager.QueuedPacket(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 NetworkManager.QueuedPacket(extra, end ? genericfuturelistener : null)); // append listener to the end
+ }
+ this.packetQueue.addAll(packets); // atomic
+ }
+ this.sendPacketQueue();
+ // Paper end
}
private void dispatchPacket(Packet<?> packet, @Nullable GenericFutureListener<? extends Future<? super Void>> genericFutureListener) { this.b(packet, genericFutureListener); } // Paper - OBFHELPER
@@ -184,51 +252,116 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
this.channel.config().setAutoRead(false);
}
+ EntityPlayer player = getPlayer(); // Paper
if (this.channel.eventLoop().inEventLoop()) {
if (enumprotocol != enumprotocol1) {
this.setProtocol(enumprotocol);
}
+ // Paper start
+ 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);
+ close(new ChatMessage("disconnect.genericReason", "Internal Exception: " + e.getMessage()));;
+ packet.onPacketDispatchFinish(player, null);
+ }
+ // Paper end
} else {
this.channel.eventLoop().execute(() -> {
if (enumprotocol != enumprotocol1) {
this.setProtocol(enumprotocol);
}
+ // Paper start
+ if (!isConnected()) {
+ packet.onPacketDispatchFinish(player, null);
+ return;
+ }
+ try {
+ // Paper end
ChannelFuture channelfuture1 = this.channel.writeAndFlush(packet);
+
if (genericfuturelistener != null) {
channelfuture1.addListener(genericfuturelistener);
}
+ // Paper start
+ if (packet.hasFinishListener()) {
+ channelfuture1.addListener((ChannelFutureListener) channelFuture -> packet.onPacketDispatchFinish(player, channelFuture));
+ }
+ // Paper end
channelfuture1.addListener(ChannelFutureListener.FIRE_EXCEPTION_ON_FAILURE);
+ // Paper start
+ } catch (Exception e) {
+ LOGGER.error("NetworkException: " + player, e);
+ close(new ChatMessage("disconnect.genericReason", "Internal Exception: " + e.getMessage()));;
+ packet.onPacketDispatchFinish(player, null);
+ }
+ // Paper end
});
}
}
- private void sendPacketQueue() { this.p(); } // Paper - OBFHELPER
- private void p() {
- if (this.channel != null && this.channel.isOpen()) {
- Queue queue = this.packetQueue;
-
+ // Paper start - rewrite this to be safer if ran off main thread
+ private boolean sendPacketQueue() { return this.p(); } // OBFHELPER // void -> boolean
+ private boolean p() { // void -> boolean
+ if (!isConnected()) {
+ return true;
+ }
+ if (MCUtil.isMainThread()) {
+ return processQueue();
+ } else if (isPending) {
+ // Should only happen during login/status stages
synchronized (this.packetQueue) {
- NetworkManager.QueuedPacket networkmanager_queuedpacket;
-
- while ((networkmanager_queuedpacket = (NetworkManager.QueuedPacket) this.packetQueue.poll()) != null) {
- this.b(networkmanager_queuedpacket.a, networkmanager_queuedpacket.b);
- }
+ return this.processQueue();
+ }
+ }
+ return false;
+ }
+ private boolean processQueue() {
+ if (this.packetQueue.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<QueuedPacket> iterator = this.packetQueue.iterator();
+ while (iterator.hasNext()) {
+ NetworkManager.QueuedPacket queued = iterator.next(); // poll -> peek
+
+ // Fix NPE (Spigot bug caused by handleDisconnection())
+ if (queued == null) {
+ return true;
+ }
+ Packet<?> packet = queued.getPacket();
+ if (!packet.isReady()) {
+ return false;
+ } else {
+ iterator.remove();
+ this.dispatchPacket(packet, queued.getGenericFutureListener());
}
}
+ return true;
}
+ // Paper end
public void a() {
this.p();
@@ -261,9 +394,21 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
return this.socketAddress;
}
+ // Paper start
+ public void clearPacketQueue() {
+ EntityPlayer player = getPlayer();
+ packetQueue.forEach(queuedPacket -> {
+ Packet<?> packet = queuedPacket.getPacket();
+ if (packet.hasFinishListener()) {
+ packet.onPacketDispatchFinish(player, null);
+ }
+ });
+ packetQueue.clear();
+ } // Paper end
public void close(IChatBaseComponent ichatbasecomponent) {
// 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.
@@ -331,7 +476,7 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
public void handleDisconnection() {
if (this.channel != null && !this.channel.isOpen()) {
if (this.o) {
- NetworkManager.LOGGER.warn("handleDisconnection() called twice");
+ //NetworkManager.LOGGER.warn("handleDisconnection() called twice"); // Paper - Do not log useless message
} else {
this.o = true;
if (this.k() != null) {
@@ -339,7 +484,7 @@ public class NetworkManager extends SimpleChannelInboundHandler<Packet<?>> {
} else if (this.j() != null) {
this.j().a(new ChatMessage("multiplayer.disconnect.generic"));
}
- this.packetQueue.clear(); // Free up packet queue.
+ clearPacketQueue(); // Paper
// Paper start - Add PlayerConnectionCloseEvent
final PacketListener packetListener = this.j();
if (packetListener instanceof PlayerConnection) {
diff --git a/src/main/java/net/minecraft/server/Packet.java b/src/main/java/net/minecraft/server/Packet.java
index 2d8e6a2f4a0c3c5d74a647d7164b0028781d3bf5..545dbe6ddcce1d172f465b4a7ab85654ee5fdbb4 100644
--- a/src/main/java/net/minecraft/server/Packet.java
+++ b/src/main/java/net/minecraft/server/Packet.java
@@ -1,5 +1,6 @@
package net.minecraft.server;
+import io.netty.channel.ChannelFuture; // Paper
import java.io.IOException;
public interface Packet<T extends PacketListener> {
@@ -11,6 +12,20 @@ public interface Packet<T extends PacketListener> {
void a(T t0);
// Paper start
+
+ /**
+ * @param player Null if not at PLAY stage yet
+ */
+ default void onPacketDispatch(@javax.annotation.Nullable EntityPlayer 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 EntityPlayer player, @javax.annotation.Nullable ChannelFuture future) {}
+ default boolean hasFinishListener() { return false; }
+ default boolean isReady() { return true; }
+ default java.util.List<Packet> getExtraPackets() { return null; }
default boolean packetTooLarge(NetworkManager manager) {
return false;
}
diff --git a/src/main/java/net/minecraft/server/ServerConnection.java b/src/main/java/net/minecraft/server/ServerConnection.java
index 8fcd8f4056620713d0c02fdd9b829053ba95e851..5f4dacf9c93c2495a07df2647fe0411f796da6af 100644
--- a/src/main/java/net/minecraft/server/ServerConnection.java
+++ b/src/main/java/net/minecraft/server/ServerConnection.java
@@ -16,6 +16,7 @@ import io.netty.channel.epoll.EpollServerSocketChannel;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.ServerSocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
+import io.netty.handler.flush.FlushConsolidationHandler; // Paper
import io.netty.handler.timeout.ReadTimeoutHandler;
import java.io.IOException;
import java.net.InetAddress;
@@ -41,10 +42,12 @@ public class ServerConnection {
private final List<NetworkManager> connectedChannels = Collections.synchronizedList(Lists.newArrayList());
// Paper start - prevent blocking on adding a new network manager while the server is ticking
private final java.util.Queue<NetworkManager> pending = new java.util.concurrent.ConcurrentLinkedQueue<>();
+ private static final boolean disableFlushConsolidation = Boolean.getBoolean("Paper.disableFlushConsolidate"); // Paper
private void addPending() {
NetworkManager manager = null;
while ((manager = pending.poll()) != null) {
connectedChannels.add(manager);
+ manager.isPending = false;
}
}
// Paper end
@@ -79,6 +82,7 @@ public class ServerConnection {
;
}
+ if (!disableFlushConsolidation) channel.pipeline().addFirst(new FlushConsolidationHandler()); // Paper
channel.pipeline().addLast("timeout", new ReadTimeoutHandler(30)).addLast("legacy_query", new LegacyPingHandler(ServerConnection.this)).addLast("splitter", new PacketSplitter()).addLast("decoder", new PacketDecoder(EnumProtocolDirection.SERVERBOUND)).addLast("prepender", new PacketPrepender()).addLast("encoder", new PacketEncoder(EnumProtocolDirection.CLIENTBOUND));
int j = ServerConnection.this.e.k();
Object object = j > 0 ? new NetworkManagerServer(j) : new NetworkManager(EnumProtocolDirection.SERVERBOUND);
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