Waterfall/BungeeCord-Patches/0049-ConnectionInitEvent.patch

From 888d05f5fba61d8aa230eebe869bce7e5c19fe82 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Mon, 2 Dec 2019 11:35:17 +0000
Subject: [PATCH] ConnectionInitEvent


diff --git a/api/src/main/java/io/github/waterfallmc/waterfall/event/ConnectionInitEvent.java b/api/src/main/java/io/github/waterfallmc/waterfall/event/ConnectionInitEvent.java
new file mode 100644
index 00000000..6e79675f
--- /dev/null
+++ b/api/src/main/java/io/github/waterfallmc/waterfall/event/ConnectionInitEvent.java
@@ -0,0 +1,56 @@
+package io.github.waterfallmc.waterfall.event;
+
+import net.md_5.bungee.api.Callback;
+import net.md_5.bungee.api.config.ListenerInfo;
+import net.md_5.bungee.api.event.AsyncEvent;
+import net.md_5.bungee.api.event.ClientConnectEvent;
+import net.md_5.bungee.api.plugin.Cancellable;
+
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+
+import lombok.ToString;
+
+/**
+ * Represents a brand new connection made to the proxy, allowing for plugins to
+ * efficiently close a connection, useful for connection throttlers, etc
+ */
+@ToString
+public class ConnectionInitEvent extends AsyncEvent<ConnectionInitEvent> implements Cancellable {
+
+    private final SocketAddress remoteAddress;
+    private final ListenerInfo listener;
+    private boolean isCancelled = false;
+
+    public ConnectionInitEvent(SocketAddress remoteAddress, ListenerInfo listener, Callback<ConnectionInitEvent> done) {
+        super(done);
+        this.remoteAddress = remoteAddress;
+        this.listener = listener;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.isCancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.isCancelled = cancel;
+    }
+
+    /**
+     * @return the INetSocketAddress of the connection being opened
+     * @deprecated BungeeCord can accept connections via Unix domain sockets
+     */
+    @Deprecated
+    public InetSocketAddress getRemoteAddress() {
+        return (InetSocketAddress) remoteAddress;
+    }
+
+    /**
+     * @return the SocketAddress of the connection being opened
+     */
+    public SocketAddress getRemoteSocketAddress() {
+        return remoteAddress;
+    }
+}
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 3f30da0c..af65e192 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
@@ -1,6 +1,7 @@
 package net.md_5.bungee.netty;
 
 import com.google.common.base.Preconditions;
+import io.github.waterfallmc.waterfall.event.ConnectionInitEvent;
 import io.netty.buffer.PooledByteBufAllocator;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelException;
@@ -63,7 +64,6 @@ public class PipelineUtils
                 ch.close();
                 return;
             }
-
             ListenerInfo listener = ch.attr( LISTENER ).get();
 
             if ( BungeeCord.getInstance().getPluginManager().callEvent( new ClientConnectEvent( remoteAddress, listener ) ).isCancelled() )
@@ -72,7 +72,21 @@ public class PipelineUtils
                 return;
             }
 
+            ConnectionInitEvent connectionInitEvent = new ConnectionInitEvent(ch.remoteAddress(), listener, (result, throwable) -> { // Waterfall
+
+            if (result.isCancelled()) {
+                ch.close();
+                return;
+            }
+
+
+            try {
             BASE.initChannel( ch );
+            } catch (Exception e) {
+                e.printStackTrace();
+                ch.close();
+                return;
+            }
             ch.pipeline().addBefore( FRAME_DECODER, LEGACY_DECODER, new LegacyDecoder() );
             ch.pipeline().addAfter( FRAME_DECODER, PACKET_DECODER, new MinecraftDecoder( Protocol.HANDSHAKE, true, ProxyServer.getInstance().getProtocolVersion() ) );
             ch.pipeline().addAfter( FRAME_PREPENDER, PACKET_ENCODER, new MinecraftEncoder( Protocol.HANDSHAKE, true, ProxyServer.getInstance().getProtocolVersion() ) );
@@ -83,6 +97,9 @@ public class PipelineUtils
             {
                 ch.pipeline().addFirst( new HAProxyMessageDecoder() );
             }
+            }); // Waterfall
+
+            BungeeCord.getInstance().getPluginManager().callEvent(connectionInitEvent);
         }
     };
     public static final Base BASE = new Base( false );
-- 
2.42.0