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May solve a race condition in ticket 220 on BukkitDev.

Browse Source 
It is possible, though not confirmed, that ProtocolLib has not been
fully cleaned up after a "reload" command and the next instance of 
ProtocolLib is loaded. In that case, it may be possible that a channel
is injected in the main thread while its cleanup procedure is still
running.

This is an attempt to solve this problem. Though, it is not confirmed
to work.
This commit is contained in:
Kristian S. Stangeland 2014-05-17 23:01:27 +02:00
parent b272322105
commit 82be6bfecc
2 changed files with 48 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
ProtocolLib/src/main/java/com/comphenix/protocol/injector/netty/ChannelInjector.java
View File

@ -8,6 +8,7 @@ import java.util.Deque;
import java.util.List;
import java.util.ListIterator;
import java.util.Map.Entry;
import java.util.NoSuchElementException;
import java.util.concurrent.Callable;
import java.util.concurrent.ConcurrentMap;
@ -34,6 +35,7 @@ import com.comphenix.protocol.PacketType.Protocol;
import com.comphenix.protocol.ProtocolLibrary;
import com.comphenix.protocol.error.Report;
import com.comphenix.protocol.error.ReportType;
import com.comphenix.protocol.error.Report.ReportBuilder;
import com.comphenix.protocol.events.ConnectionSide;
import com.comphenix.protocol.events.NetworkMarker;
import com.comphenix.protocol.events.PacketEvent;
@ -57,6 +59,7 @@ import com.google.common.collect.MapMaker;
class ChannelInjector extends ByteToMessageDecoder implements Injector {
public static final ReportType REPORT_CANNOT_INTERCEPT_SERVER_PACKET = new ReportType("Unable to intercept a written server packet.");
public static final ReportType REPORT_CANNOT_INTERCEPT_CLIENT_PACKET = new ReportType("Unable to intercept a read client packet.");
public static final ReportType REPORT_CANNOT_EXECUTE_IN_CHANNEL_THREAD = new ReportType("Cannot execute code in channel thread.");
/**
* Indicates that a packet has bypassed packet listeners.
@ -166,7 +169,20 @@ class ChannelInjector extends ByteToMessageDecoder implements Injector {
return false;
if (!originalChannel.isActive())
return false;
// Main thread? We should synchronize with the channel thread, otherwise we might see a
// pipeline with only some of the handlers removed
if (Bukkit.isPrimaryThread()) {
// Just like in the close() method, we'll avoid blocking the main thread
executeInChannelThread(new Runnable() {
@Override
public void run() {
inject();
}
});
return false; // We don't know
}
// Don't inject the same channel twice
if (findChannelHandler(originalChannel, ChannelInjector.class) != null) {
return false;
@ -692,20 +708,44 @@ class ChannelInjector extends ByteToMessageDecoder implements Injector {
// the worker thread is waiting for the main thread to finish executing PlayerQuitEvent.
//
// TLDR: Concurrenty is hard.
originalChannel.eventLoop().submit(new Callable<Object>() {
executeInChannelThread(new Runnable() {
@Override
public Object call() throws Exception {
originalChannel.pipeline().remove(ChannelInjector.this);
originalChannel.pipeline().remove(finishHandler);
originalChannel.pipeline().remove(protocolEncoder);
return null;
public void run() {
for (ChannelHandler handler : new ChannelHandler[] { ChannelInjector.this, finishHandler, protocolEncoder }) {
try {
originalChannel.pipeline().remove(handler);
} catch (NoSuchElementException e) {
// Ignore
}
}
}
});
// Clear cache
factory.invalidate(player);
}
}
}
/**
* Execute a specific command in the channel thread.
* <p>
* Exceptions are printed through the standard error reporter mechanism.
* @param command - the command to execute.
*/
private void executeInChannelThread(final Runnable command) {
originalChannel.eventLoop().execute(new Runnable() {
@Override
public void run() {
try {
command.run();
} catch (Exception e) {
ProtocolLibrary.getErrorReporter().reportDetailed(ChannelInjector.this,
Report.newBuilder(REPORT_CANNOT_EXECUTE_IN_CHANNEL_THREAD).error(e).build());
}
}
});
}
/**
* Find the first channel handler that is assignable to a given type.

2
ProtocolLib/src/main/java/com/comphenix/protocol/injector/netty/NettyProtocolInjector.java
View File

@ -38,7 +38,7 @@ import com.google.common.collect.Lists;
public class NettyProtocolInjector implements ChannelListener {
public static final ReportType REPORT_CANNOT_INJECT_INCOMING_CHANNEL = new ReportType("Unable to to inject incoming channel %s.");
public static final ReportType REPORT_CANNOT_INJECT_INCOMING_CHANNEL = new ReportType("Unable to inject incoming channel %s.");
private volatile boolean injected;
private volatile boolean closed;