Refactor chunk compression to use its own thread pool in order to eliminate disconnect race conditions caused by Mojang's nasty disconnect routines.

CraftBukkit-Patches/0105-Implement-Threaded-Bulk-Chunk-Compression-and-Cachin.patch

@@ -1,21 +1,25 @@
-From 0db589c05b3eb0d213df3e7640818b77935c2e02 Mon Sep 17 00:00:00 2001
+From d56db82cd2978a74349685a4a392da310f9822df Mon Sep 17 00:00:00 2001
 From: md_5 <git@md-5.net>
 Date: Tue, 28 Jan 2014 20:32:07 +1100
 Subject: [PATCH] Implement Threaded Bulk Chunk Compression and Caching
 
 
 diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
-index 9b853a9..a4c8843 100644
+index 9b853a9..295b80d 100644
 --- a/src/main/java/net/minecraft/server/EntityPlayer.java
 +++ b/src/main/java/net/minecraft/server/EntityPlayer.java
-@@ -228,6 +228,7 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
+@@ -228,7 +228,10 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
              }
  
              if (!arraylist.isEmpty()) {
-+                java.util.Collections.sort( arraylist, new PlayerChunkMap.ChunkComparator( this ) ); // Spigot - sort a final time before sending
-                 this.playerConnection.sendPacket(new PacketPlayOutMapChunkBulk(arraylist));
+-                this.playerConnection.sendPacket(new PacketPlayOutMapChunkBulk(arraylist));
++                // Spigot Start
++                java.util.Collections.sort( arraylist, new PlayerChunkMap.ChunkComparator( this ) );
++                org.spigotmc.ChunkCompressor.sendAndCompress( this, new PacketPlayOutMapChunkBulk( arraylist ) );
++                // Spigot End
                  Iterator iterator2 = arraylist1.iterator();
  
+                 while (iterator2.hasNext()) {
 diff --git a/src/main/java/net/minecraft/server/PacketPlayOutMapChunkBulk.java b/src/main/java/net/minecraft/server/PacketPlayOutMapChunkBulk.java
 index fc92026..484d727 100644
 --- a/src/main/java/net/minecraft/server/PacketPlayOutMapChunkBulk.java
@@ -66,86 +70,51 @@ index ae4ca63..962e902 100644
          private int x;
          private int z;
  
-diff --git a/src/main/java/net/minecraft/server/ServerConnectionChannel.java b/src/main/java/net/minecraft/server/ServerConnectionChannel.java
-index fb95be4..a382235 100644
---- a/src/main/java/net/minecraft/server/ServerConnectionChannel.java
-+++ b/src/main/java/net/minecraft/server/ServerConnectionChannel.java
-@@ -1,14 +1,25 @@
- package net.minecraft.server;
- 
-+import com.google.common.util.concurrent.ThreadFactoryBuilder; // Spigot
- import net.minecraft.util.io.netty.channel.Channel;
- import net.minecraft.util.io.netty.channel.ChannelException;
- import net.minecraft.util.io.netty.channel.ChannelInitializer;
- import net.minecraft.util.io.netty.channel.ChannelOption;
- import net.minecraft.util.io.netty.handler.timeout.ReadTimeoutHandler;
-+// Spigot Start
-+import net.minecraft.util.io.netty.util.concurrent.DefaultEventExecutorGroup;
-+import net.minecraft.util.io.netty.util.concurrent.EventExecutorGroup;
-+import org.spigotmc.ChunkCompressor;
-+import org.spigotmc.SpigotConfig;
-+// Spigot End
- 
- class ServerConnectionChannel extends ChannelInitializer {
- 
-     final ServerConnection a;
-+    // Spigot Start
-+    private static final EventExecutorGroup threadPool = new DefaultEventExecutorGroup( SpigotConfig.compressionThreads, new ThreadFactoryBuilder().setNameFormat( "Chunk Compressor #%d" ).setDaemon( true ).build() );
-+    private static final ChunkCompressor chunkCompressor = new ChunkCompressor();
-+    // Spigot End
- 
-     ServerConnectionChannel(ServerConnection serverconnection) {
-         this.a = serverconnection;
-@@ -28,6 +39,7 @@ class ServerConnectionChannel extends ChannelInitializer {
-         }
- 
-         channel.pipeline().addLast("timeout", new ReadTimeoutHandler(30)).addLast("legacy_query", new LegacyPingHandler(this.a)).addLast("splitter", new PacketSplitter()).addLast("decoder", new PacketDecoder()).addLast("prepender", new PacketPrepender()).addLast("encoder", new PacketEncoder());
-+        channel.pipeline().addLast( threadPool, "compressor", chunkCompressor ); // Spigot
-         NetworkManager networkmanager = new NetworkManager(false);
- 
-         ServerConnection.a(this.a).add(networkmanager);
 diff --git a/src/main/java/org/spigotmc/ChunkCompressor.java b/src/main/java/org/spigotmc/ChunkCompressor.java
 new file mode 100644
-index 0000000..481211b
+index 0000000..d43e528
 --- /dev/null
 +++ b/src/main/java/org/spigotmc/ChunkCompressor.java
-@@ -0,0 +1,94 @@
+@@ -0,0 +1,80 @@
 +package org.spigotmc;
 +
++import com.google.common.util.concurrent.ThreadFactoryBuilder;
 +import java.util.Arrays;
 +import java.util.Iterator;
 +import java.util.LinkedHashMap;
 +import java.util.logging.Level;
 +import java.util.zip.CRC32;
++import net.minecraft.server.EntityPlayer;
 +import net.minecraft.server.PacketPlayOutMapChunkBulk;
-+import net.minecraft.util.io.netty.channel.ChannelHandler;
-+import net.minecraft.util.io.netty.channel.ChannelHandlerContext;
-+import net.minecraft.util.io.netty.channel.ChannelOutboundHandlerAdapter;
-+import net.minecraft.util.io.netty.channel.ChannelPromise;
++import net.minecraft.util.io.netty.util.concurrent.DefaultEventExecutorGroup;
++import net.minecraft.util.io.netty.util.concurrent.EventExecutorGroup;
 +import org.bukkit.Bukkit;
 +
-+@ChannelHandler.Sharable
-+public class ChunkCompressor extends ChannelOutboundHandlerAdapter
++public class ChunkCompressor
 +{
 +
-+    private final LinkedHashMap<Long, byte[]> cache = new LinkedHashMap<Long, byte[]>( 16, 0.75f, true ); // Defaults, order by access
-+    private volatile int cacheSize;
++    private static final EventExecutorGroup threadPool = new DefaultEventExecutorGroup( SpigotConfig.compressionThreads, new ThreadFactoryBuilder().setNameFormat( "Chunk Compressor #%d" ).setDaemon( true ).build() );
++    private static final LinkedHashMap<Long, byte[]> cache = new LinkedHashMap<Long, byte[]>( 16, 0.75f, true ); // Defaults, order by access
++    private static volatile int cacheSize;
++
++    public static void sendAndCompress(final EntityPlayer player, final PacketPlayOutMapChunkBulk chunk)
++    {
++        threadPool.submit( new Runnable()
++        {
 +
 +            @Override
-+    public synchronized void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception
++            public void run()
 +            {
 +                try
 +                {
 +                    long start = System.currentTimeMillis();
 +                    boolean cached = false;
-+            if ( msg instanceof PacketPlayOutMapChunkBulk )
-+            {
-+                PacketPlayOutMapChunkBulk chunk = (PacketPlayOutMapChunkBulk) msg;
 +                    // Well shit, orebfuscator is at it again
 +                    if ( chunk.inflatedBuffers == null )
 +                    {
 +                        Bukkit.getServer().getLogger().warning( "chunk.inflatedBuffers is null. Are you running Oreobfuscator? If so, please note that it is unsupported and will disable async compression" );
-+                    super.write( ctx, msg, promise );
++                        player.playerConnection.sendPacket( chunk );
++                        return;
 +                    }
 +
 +                    // Here we assign a hash to the chunk based on its contents. CRC32 is fast and sufficient for use here.
@@ -178,30 +147,13 @@ index 0000000..481211b
 +                        cache.put( hash, buffer ); // Pop the new one in the cache
 +                    }
 +                    // System.out.println( "Time: " + ( System.currentTimeMillis() - start ) + " " + cached + " " + cacheSize );
-+            }
++                    player.playerConnection.sendPacket( chunk );
 +                } catch ( Throwable t )
 +                {
 +                    Bukkit.getServer().getLogger().log( Level.WARNING, "Error compressing or caching chunk", t );
 +                }
-+
-+        super.write( ctx, msg, promise );
 +            }
-+
-+    @Override
-+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception
-+    {
-+        // In short, there isn't actually anything wrong with the async chunk compressor, it just accidentally caused console logging of errors which were previously ignored.\
-+        // This commit restores that behaviour
-+
-+        // You may be asking yourself why we are completely ignoring any errors which come this far down the pipeline.
-+        // The answer is quite simple:
-+        // Mojang did it
-+        // The default Mojang pipeline doesn't have any ChannelOutboundHandlerAdapter or similar instances, and thus nothing to handle exceptionCaught
-+        // So when a channel.write() or channel.flush() fails, the error message is actually just passed straight to the future provided.
-+        // It is then subsequently discarded, the channel closed, and no one except the user was any the wiser it actually happened!
-+        // Unfortunately for us, the default exceptionCaught in this class sends a blaring warning to the server admins indicating that it couldn't send a packet to a disconnected user!
-+        // We don't care about these warnings, if we did something wrong to disconnect the user, it is already logged in the proper location, as are broken sockets
-+        // tl;dr no need to blare warnings on each write to a broken socket
++        } );
 +    }
 +}
 diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java