Waterfall/BungeeCord-Patches/0064-Replace-reflection-inside-netty-with-ChannelFactory.patch

From 0f6f4601d455713102ad18766199c7cfb53c8ca1 Mon Sep 17 00:00:00 2001
From: Janmm14 <gitconfig1@janmm14.de>
Date: Mon, 21 Jun 2021 23:43:39 +0200
Subject: [PATCH] Replace reflection inside netty with ChannelFactory.

Thanks for pointing it out @MrIvanPlays

diff --git a/proxy/src/main/java/net/md_5/bungee/BungeeCord.java b/proxy/src/main/java/net/md_5/bungee/BungeeCord.java
index 3a86fac8..a7091ab6 100644
--- a/proxy/src/main/java/net/md_5/bungee/BungeeCord.java
+++ b/proxy/src/main/java/net/md_5/bungee/BungeeCord.java
@@ -358,7 +358,7 @@ public class BungeeCord extends ProxyServer
                 }
             };
             new ServerBootstrap()
-                    .channel( PipelineUtils.getServerChannel( info.getSocketAddress() ) )
+                    .channelFactory( PipelineUtils.getServerChannelFactory( info.getSocketAddress() ) ) // Waterfall - netty reflection -> factory
                     .option( ChannelOption.SO_REUSEADDR, true ) // TODO: Move this elsewhere!
                     .childAttr( PipelineUtils.LISTENER, info )
                     .childHandler( PipelineUtils.SERVER_CHILD )
diff --git a/proxy/src/main/java/net/md_5/bungee/BungeeServerInfo.java b/proxy/src/main/java/net/md_5/bungee/BungeeServerInfo.java
index 377df7ec..8f531f85 100644
--- a/proxy/src/main/java/net/md_5/bungee/BungeeServerInfo.java
+++ b/proxy/src/main/java/net/md_5/bungee/BungeeServerInfo.java
@@ -184,7 +184,7 @@ public class BungeeServerInfo implements ServerInfo
             }
         };
         new Bootstrap()
-                .channel( PipelineUtils.getChannel( socketAddress ) )
+                .channelFactory( PipelineUtils.getChannelFactory( socketAddress ) ) // Waterfall - netty reflection -> factory
                 .group( BungeeCord.getInstance().workerEventLoopGroup )
                 .handler( PipelineUtils.BASE_SERVERSIDE )
                 .option( ChannelOption.CONNECT_TIMEOUT_MILLIS, BungeeCord.getInstance().getConfig().getRemotePingTimeout() )
diff --git a/proxy/src/main/java/net/md_5/bungee/UserConnection.java b/proxy/src/main/java/net/md_5/bungee/UserConnection.java
index cbc45c5c..0281c393 100644
--- a/proxy/src/main/java/net/md_5/bungee/UserConnection.java
+++ b/proxy/src/main/java/net/md_5/bungee/UserConnection.java
@@ -410,7 +410,7 @@ public final class UserConnection implements ProxiedPlayer
             }
         };
         Bootstrap b = new Bootstrap()
-                .channel( PipelineUtils.getChannel( target.getAddress() ) )
+                .channelFactory( PipelineUtils.getChannelFactory( target.getAddress() ) ) // Waterfall - netty reflection -> factory
                 .group( ch.getHandle().eventLoop() )
                 .handler( initializer )
                 .option( ChannelOption.CONNECT_TIMEOUT_MILLIS, request.getConnectTimeout() )
diff --git a/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java b/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java
index 37337429..c3683c30 100644
--- a/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java
+++ b/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java
@@ -111,7 +111,8 @@ public class HttpClient
 
     private static void getWithNettyResolver(EventLoop eventLoop, URI uri, int port, ChannelFutureListener future, Callback<String> callback, boolean ssl) {
         java.net.InetSocketAddress address = java.net.InetSocketAddress.createUnresolved(uri.getHost(), port);
-        new Bootstrap().channel( PipelineUtils.getChannel( null ) ).group( eventLoop ).handler( new HttpInitializer( callback, ssl, uri.getHost(), port ) ).
+        // Waterfall - netty reflection -> factory
+        new Bootstrap().channelFactory( PipelineUtils.getChannelFactory( null ) ).group( eventLoop ).handler( new HttpInitializer( callback, ssl, uri.getHost(), port ) ).
                 option( ChannelOption.CONNECT_TIMEOUT_MILLIS, TIMEOUT ).resolver(dnsResolverGroup).remoteAddress( address ).connect().addListener( future );
     }
 
@@ -130,7 +131,8 @@ public class HttpClient
             }
             addressCache.put( uri.getHost(), inetHost );
         }
-        new Bootstrap().channel( PipelineUtils.getChannel( null ) ).group( eventLoop ).handler( new HttpInitializer( callback, ssl, uri.getHost(), port ) ).
+        // Waterfall - netty reflection -> factory
+        new Bootstrap().channelFactory( PipelineUtils.getChannelFactory( null ) ).group( eventLoop ).handler( new HttpInitializer( callback, ssl, uri.getHost(), port ) ).
                 option( ChannelOption.CONNECT_TIMEOUT_MILLIS, TIMEOUT ).remoteAddress( inetHost, port ).connect().addListener( future );
     }
     // Waterfall End
diff --git a/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java b/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java
index af65e192..6a045d16 100644
--- a/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java
+++ b/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java
@@ -5,6 +5,7 @@ import io.github.waterfallmc.waterfall.event.ConnectionInitEvent;
 import io.netty.buffer.PooledByteBufAllocator;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelException;
+import io.netty.channel.ChannelFactory;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelOption;
 import io.netty.channel.EventLoopGroup;
@@ -119,6 +120,12 @@ public class PipelineUtils
     public static final String LEGACY_KICKER = "legacy-kick";
 
     private static boolean epoll;
+    // Waterfall start: netty reflection -> factory
+    private static final ChannelFactory<? extends ServerChannel> serverChannelFactory;
+    private static final ChannelFactory<? extends ServerChannel> serverChannelDomainFactory;
+    private static final ChannelFactory<? extends Channel> channelFactory;
+    private static final ChannelFactory<? extends Channel> channelDomainFactory;
+    // Waterfall end
 
     static
     {
@@ -134,6 +141,12 @@ public class PipelineUtils
                 ProxyServer.getInstance().getLogger().log( Level.WARNING, "Epoll is not working, falling back to NIO: {0}", Util.exception( Epoll.unavailabilityCause() ) );
             }
         }
+        // Waterfall start: netty reflection -> factory
+        serverChannelFactory = epoll ? EpollServerSocketChannel::new : NioServerSocketChannel::new;
+        serverChannelDomainFactory = epoll ? EpollServerDomainSocketChannel::new : null;
+        channelFactory = epoll ? EpollSocketChannel::new : NioSocketChannel::new;
+        channelDomainFactory = epoll ? EpollDomainSocketChannel::new : null;
+        // Waterfall end
     }
 
     public static EventLoopGroup newEventLoopGroup(int threads, ThreadFactory factory)
@@ -165,6 +178,34 @@ public class PipelineUtils
         return epoll ? EpollSocketChannel.class : NioSocketChannel.class;
     }
 
+    // Waterfall start: netty reflection -> factory
+    public static ChannelFactory<? extends ServerChannel> getServerChannelFactory(SocketAddress address)
+    {
+        if ( address instanceof DomainSocketAddress )
+        {
+            ChannelFactory<? extends ServerChannel> factory = PipelineUtils.serverChannelDomainFactory;
+            Preconditions.checkState( factory != null, "Epoll required to have UNIX sockets" );
+
+            return factory;
+        }
+
+        return serverChannelFactory;
+    }
+
+    public static ChannelFactory<? extends Channel> getChannelFactory(SocketAddress address)
+    {
+        if ( address instanceof DomainSocketAddress )
+        {
+            ChannelFactory<? extends Channel> factory = PipelineUtils.channelDomainFactory;
+            Preconditions.checkState( factory != null, "Epoll required to have UNIX sockets" );
+
+            return factory;
+        }
+
+        return channelFactory;
+    }
+    // Waterfall end
+
     public static Class<? extends DatagramChannel> getDatagramChannel()
     {
         return epoll ? EpollDatagramChannel.class : NioDatagramChannel.class;
-- 
2.42.0