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Add proper thread safety. Please let me know if this deadlocks your server.

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By: md_5 <md_5@live.com.au>
This commit is contained in:
Spigot 2013-02-10 18:35:09 +11:00
parent 3e9cf48079
commit bf3fab5c13
1 changed files with 56 additions and 46 deletions
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102
CraftBukkit-Patches/0026-Netty.patch
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@ -1,4 +1,4 @@
From 8794e1bc1ae9773a9f7c9943c7696a76e66691aa Mon Sep 17 00:00:00 2001
From 2624cc163bed8a94b851c7dbc186a304ce63bff7 Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Sun, 3 Feb 2013 10:24:33 +1100
Subject: [PATCH] Netty
@ -17,13 +17,13 @@ This commit is licensed under the Creative Commons Attribution-ShareAlike 3.0 Un
.../net/minecraft/server/PendingConnection.java | 15 +-
.../net/minecraft/server/PlayerConnection.java | 2 +-
src/main/java/org/spigotmc/netty/CipherCodec.java | 65 ++++++
.../org/spigotmc/netty/NettyNetworkManager.java | 211 ++++++++++++++++++
.../org/spigotmc/netty/NettyNetworkManager.java | 221 ++++++++++++++++++
.../org/spigotmc/netty/NettyServerConnection.java | 105 +++++++++
.../org/spigotmc/netty/NettySocketAdaptor.java | 248 +++++++++++++++++++++
.../java/org/spigotmc/netty/PacketDecoder.java | 47 ++++
.../java/org/spigotmc/netty/PacketEncoder.java | 43 ++++
.../java/org/spigotmc/netty/PacketListener.java | 100 +++++++++
11 files changed, 841 insertions(+), 7 deletions(-)
11 files changed, 851 insertions(+), 7 deletions(-)
create mode 100644 src/main/java/org/spigotmc/netty/CipherCodec.java
create mode 100644 src/main/java/org/spigotmc/netty/NettyNetworkManager.java
create mode 100644 src/main/java/org/spigotmc/netty/NettyServerConnection.java
@ -208,10 +208,10 @@ index 0000000..cfc0535
+}
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..effd1ee
index 0000000..81aa42e
--- /dev/null
+++ b/src/main/java/org/spigotmc/netty/NettyNetworkManager.java
@@ -0,0 +1,211 @@
@@ -0,0 +1,221 @@
+package org.spigotmc.netty;
+
+import io.netty.channel.Channel;
@ -247,8 +247,9 @@ index 0000000..effd1ee
+ private static final PrivateKey key = server.F().getPrivate();
+ private static final NettyServerConnection serverConnection = (NettyServerConnection) server.ae();
+ /*========================================================================*/
+ private Queue<Packet> syncPackets = new ConcurrentLinkedQueue<Packet>();
+ private volatile Channel channel;
+ private final Object mutex = new Object();
+ private final Queue<Packet> syncPackets = new ConcurrentLinkedQueue<Packet>();
+ private Channel channel;
+ private SocketAddress address;
+ private Connection handler;
+ private SecretKey secret;
@ -258,35 +259,41 @@ index 0000000..effd1ee
+
+ @Override
+ public void channelActive(ChannelHandlerContext ctx) throws Exception {
+ // Channel and address groundwork first
+ channel = ctx.channel();
+ address = channel.remoteAddress();
+ // Then the socket adaptor
+ socketAdaptor = NettySocketAdaptor.adapt((SocketChannel) channel);
+ // Followed by their first handler
+ handler = new PendingConnection(server, this);
+ // Finally register the connection
+ serverConnection.pendingConnections.add((PendingConnection) handler);
+ synchronized (mutex) {
+ // Channel and address groundwork first
+ channel = ctx.channel();
+ address = channel.remoteAddress();
+ // Then the socket adaptor
+ socketAdaptor = NettySocketAdaptor.adapt((SocketChannel) channel);
+ // Followed by their first handler
+ handler = new PendingConnection(server, this);
+ // Finally register the connection
+ serverConnection.pendingConnections.add((PendingConnection) handler);
+ }
+ }
+
+ @Override
+ public void channelInactive(ChannelHandlerContext ctx) throws Exception {
+ if (dcReason == null || dcArgs == null) {
+ a("disconnect.endOfStream", new Object[0]);
+ synchronized (mutex) {
+ if (dcReason == null || dcArgs == null) {
+ a("disconnect.endOfStream", new Object[0]);
+ }
+ // Remove channel reference to indicate we are done
+ channel = null;
+ }
+ // Remove channel reference to indicate we are done
+ channel = null;
+ }
+
+ @Override
+ public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+ // TODO: Remove this once we are more stable
+ // Bukkit.getServer().getLogger().severe("======================= Start Netty Debug Log =======================");
+ // Bukkit.getServer().getLogger().log(Level.SEVERE, "Error caught whilst handling " + channel, cause);
+ // Bukkit.getServer().getLogger().severe("======================= End Netty Debug Log =======================");
+ synchronized (mutex) {
+ // TODO: Remove this once we are more stable
+ // Bukkit.getServer().getLogger().severe("======================= Start Netty Debug Log =======================");
+ // Bukkit.getServer().getLogger().log(Level.SEVERE, "Error caught whilst handling " + channel, cause);
+ // Bukkit.getServer().getLogger().severe("======================= End Netty Debug Log =======================");
+
+ // Disconnect with generic reason + exception
+ a("disconnect.genericReason", new Object[]{"Internal exception: " + cause});
+ // Disconnect with generic reason + exception
+ a("disconnect.genericReason", new Object[]{"Internal exception: " + cause});
+ }
+ }
+
+ @Override
@ -329,21 +336,20 @@ index 0000000..effd1ee
+ * @param packet the packet to queue
+ */
+ public void queue(Packet packet) {
+ // Only send if channel is still connected
+ if (channel != null) {
+ // Process packet via handler
+ packet = PacketListener.callQueued(this, handler, packet);
+ // If handler indicates packet send
+ if (packet != null) {
+ channel.write(packet);
+ synchronized (mutex) {
+ // Only send if channel is still connected
+ if (channel != null) {
+ // Process packet via handler
+ packet = PacketListener.callQueued(this, handler, packet);
+ // If handler indicates packet send
+ if (packet != null) {
+ channel.write(packet);
+
+ // If needed, check and prepare encryption phase
+ if (packet instanceof Packet252KeyResponse) {
+ BufferedBlockCipher encrypt = NettyServerConnection.getCipher(true, secret);
+ BufferedBlockCipher decrypt = NettyServerConnection.getCipher(false, secret);
+ CipherCodec codec = new CipherCodec(encrypt, decrypt);
+ // Only add if the channel hasn't disconnected in the meantime
+ if (channel != null) {
+ // If needed, check and prepare encryption phase
+ if (packet instanceof Packet252KeyResponse) {
+ BufferedBlockCipher encrypt = NettyServerConnection.getCipher(true, secret);
+ BufferedBlockCipher decrypt = NettyServerConnection.getCipher(false, secret);
+ CipherCodec codec = new CipherCodec(encrypt, decrypt);
+ channel.pipeline().addBefore("decoder", "cipher", codec);
+ }
+ }
@ -392,8 +398,10 @@ index 0000000..effd1ee
+ * close. Close and release all resources associated with this connection.
+ */
+ public void d() {
+ if (channel != null) {
+ channel.close();
+ synchronized (mutex) {
+ if (channel != null) {
+ channel.close();
+ }
+ }
+ }
+
@ -416,10 +424,12 @@ index 0000000..effd1ee
+ * exception which triggered the disconnect.
+ */
+ public void a(String reason, Object... arguments) {
+ if (channel != null) {
+ dcReason = reason;
+ dcArgs = arguments;
+ channel.close();
+ synchronized (mutex) {
+ if (channel != null) {
+ dcReason = reason;
+ dcArgs = arguments;
+ channel.close();
+ }
+ }
+ }
+}