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Implement a "proper" connection throttle for netty.

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Proper meaning a simple portover from CraftBukkit's implementation.

The last implementation had a few issues:
- For each server ping, the connection was getting throttled.
- ConcurrentHashMap is heavy (More of an opinion but don't judge)

From the last implementation, the connection throttle entry (your IP) wasn't getting removed from the list after a server ping, which is supposed to happen according to the original implementation.
This commit is contained in:
SuPaH sPii 2013-04-18 13:27:29 -05:00 committed by md_5
parent b158bb3960
commit 296620b306
1 changed files with 119 additions and 5 deletions
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124
CraftBukkit-Patches/0021-Netty.patch
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@ -152,7 +152,7 @@ index 9f8afe3..b1d3a17 100644
};
// CraftBukkit end
diff --git a/src/main/java/net/minecraft/server/PendingConnection.java b/src/main/java/net/minecraft/server/PendingConnection.java
index eb474f5..fcfc3d2 100644
index eb474f5..bbf1abd 100644
--- a/src/main/java/net/minecraft/server/PendingConnection.java
+++ b/src/main/java/net/minecraft/server/PendingConnection.java
@@ -17,7 +17,7 @@ public class PendingConnection extends Connection {
@ -190,6 +190,80 @@ index eb474f5..fcfc3d2 100644
// CraftBukkit start - Fix decompile issues, don't create a list from an array
Object[] list = new Object[] { 1, 60, this.server.getVersion(), pingEvent.getMotd(), playerlist.getPlayerCount(), pingEvent.getMaxPlayers() };
@@ -173,8 +178,8 @@ public class PendingConnection extends Connection {
this.networkManager.queue(new Packet255KickDisconnect(s));
this.networkManager.d();
- if (inetaddress != null && this.server.ae() instanceof DedicatedServerConnection) {
- ((DedicatedServerConnection) this.server.ae()).a(inetaddress);
+ if (inetaddress != null) { // Spigot - removed DedicatedServerConnection instance check
+ this.server.ae().a(inetaddress);
}
this.b = true;
diff --git a/src/main/java/net/minecraft/server/ServerConnection.java b/src/main/java/net/minecraft/server/ServerConnection.java
new file mode 100644
index 0000000..0113ed3
--- /dev/null
+++ b/src/main/java/net/minecraft/server/ServerConnection.java
@@ -0,0 +1,57 @@
+package net.minecraft.server;
+
+import java.net.InetAddress;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public abstract class ServerConnection {
+
+ private final MinecraftServer b;
+ private final List c = Collections.synchronizedList(new ArrayList());
+ public volatile boolean a = false;
+
+ public ServerConnection(MinecraftServer minecraftserver) {
+ this.b = minecraftserver;
+ this.a = true;
+ }
+
+ public void a(PlayerConnection playerconnection) {
+ this.c.add(playerconnection);
+ }
+
+ public abstract void a(InetAddress address); // Spigot - make a(InetAddress) a abstract void
+
+ public void a() {
+ this.a = false;
+ }
+
+ public void b() {
+ for (int i = 0; i < this.c.size(); ++i) {
+ PlayerConnection playerconnection = (PlayerConnection) this.c.get(i);
+
+ try {
+ playerconnection.d();
+ } catch (Exception exception) {
+ if (playerconnection.networkManager instanceof MemoryNetworkManager) {
+ CrashReport crashreport = CrashReport.a((Throwable) exception, "Ticking memory connection");
+
+ throw new ReportedException(crashreport);
+ }
+
+ this.b.getLogger().warning("Failed to handle packet for " + playerconnection.player.getLocalizedName() + "/" + playerconnection.player.p() + ": " + exception, (Throwable) exception);
+ playerconnection.disconnect("Internal server error");
+ }
+
+ if (playerconnection.disconnected) {
+ this.c.remove(i--);
+ }
+
+ playerconnection.networkManager.a();
+ }
+ }
+
+ public MinecraftServer d() {
+ return this.b;
+ }
+}
diff --git a/src/main/java/net/minecraft/server/ThreadCommandReader.java b/src/main/java/net/minecraft/server/ThreadCommandReader.java
index 489e184..9533b6f 100644
--- a/src/main/java/net/minecraft/server/ThreadCommandReader.java
@ -302,10 +376,10 @@ index 0000000..2dbbf6c
+}
diff --git a/src/main/java/org/spigotmc/netty/NettyNetworkManager.java b/src/main/java/org/spigotmc/netty/NettyNetworkManager.java
new file mode 100644
index 0000000..94d126d
index 0000000..85a6c05
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/NettyNetworkManager.java
@@ -0,0 +1,247 @@
@@ -0,0 +1,271 @@
+package org.spigotmc.netty;
+
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
@ -313,10 +387,13 @@ index 0000000..94d126d
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundMessageHandlerAdapter;
+import io.netty.channel.socket.SocketChannel;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.net.SocketAddress;
+import java.security.PrivateKey;
+import java.util.AbstractList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Queue;
+import java.util.concurrent.ConcurrentLinkedQueue;
@ -370,12 +447,33 @@ index 0000000..94d126d
+ private Object[] dcArgs;
+ private Socket socketAdaptor;
+ private long writtenBytes;
+ private long connectionThrottle;
+
+ @Override
+ public void channelActive(ChannelHandlerContext ctx) throws Exception {
+ // Channel and address groundwork first
+ channel = ctx.channel();
+ address = channel.remoteAddress();
+ // Connection throttler (ported from CraftBukkit)
+ long currentTime = System.currentTimeMillis();
+ InetAddress iaddress = ((InetSocketAddress) channel.remoteAddress()).getAddress();
+
+ if (server == null || server.server == null) {
+ channel.close();
+ return;
+ }
+
+ connectionThrottle = server.server.getConnectionThrottle();
+
+ synchronized (serverConnection.throttledConnections) {
+ if (serverConnection.throttledConnections.containsKey(iaddress) && !"127.0.0.1".equals(iaddress.getHostAddress()) && currentTime - (serverConnection.throttledConnections.get(iaddress)).longValue() < connectionThrottle) {
+ serverConnection.throttledConnections.put(iaddress, Long.valueOf(currentTime));
+ channel.close();
+ return;
+ }
+
+ serverConnection.throttledConnections.put(iaddress, Long.valueOf(currentTime));
+ }
+ // Then the socket adaptor
+ socketAdaptor = NettySocketAdaptor.adapt((SocketChannel) channel);
+ // Followed by their first handler
@ -555,10 +653,10 @@ index 0000000..94d126d
+}
diff --git a/src/main/java/org/spigotmc/netty/NettyServerConnection.java b/src/main/java/org/spigotmc/netty/NettyServerConnection.java
new file mode 100644
index 0000000..790f325
index 0000000..7809aa9
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/NettyServerConnection.java
@@ -0,0 +1,110 @@
@@ -0,0 +1,126 @@
+package org.spigotmc.netty;
+
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
@ -576,6 +674,7 @@ index 0000000..790f325
+import java.security.Key;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.logging.Level;
+import javax.crypto.Cipher;
@ -594,6 +693,7 @@ index 0000000..790f325
+public class NettyServerConnection extends ServerConnection {
+
+ private final ChannelFuture socket;
+ final HashMap<InetAddress, Long> throttledConnections = new HashMap<InetAddress, Long>();
+ final List<PendingConnection> pendingConnections = Collections.synchronizedList(new ArrayList<PendingConnection>());
+
+ public NettyServerConnection(MinecraftServer ms, InetAddress host, int port) {
@ -643,6 +743,20 @@ index 0000000..790f325
+ }
+
+ /**
+ * Remove the user from connection throttle. This should fix the server ping bugs.
+ *
+ * @param address the address to remove
+ */
+ @Override
+ public void a(InetAddress address) {
+ if (address != null) {
+ synchronized (throttledConnections) {
+ throttledConnections.remove(address);
+ }
+ }
+ }
+
+ /**
+ * Shutdown. This method is called when the server is shutting down and the
+ * server socket and all clients should be terminated with no further
+ * action.