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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.streaming;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.SocketException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.Collection;
import java.util.Comparator;
import java.util.concurrent.PriorityBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.SettableFuture;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.concurrent.NamedThreadFactory;
import org.apache.cassandra.io.util.DataOutputStreamPlus;
import org.apache.cassandra.io.util.BufferedDataOutputStreamPlus;
import org.apache.cassandra.io.util.WrappedDataOutputStreamPlus;
import org.apache.cassandra.net.IncomingStreamingConnection;
import org.apache.cassandra.streaming.messages.StreamInitMessage;
import org.apache.cassandra.streaming.messages.StreamMessage;
import org.apache.cassandra.utils.FBUtilities;
import org.apache.cassandra.utils.JVMStabilityInspector;
/**
* ConnectionHandler manages incoming/outgoing message exchange for the {@link StreamSession}.
*
*
* Internally, ConnectionHandler manages thread to receive incoming {@link StreamMessage} and thread to
* send outgoing message. Messages are encoded/decoded on those thread and handed to
* {@link StreamSession#messageReceived(org.apache.cassandra.streaming.messages.StreamMessage)}.
*/
public class ConnectionHandler
{
private static final Logger logger = LoggerFactory.getLogger(ConnectionHandler.class);
private final StreamSession session;
private IncomingMessageHandler incoming;
private OutgoingMessageHandler outgoing;
ConnectionHandler(StreamSession session)
{
this.session = session;
this.incoming = new IncomingMessageHandler(session);
this.outgoing = new OutgoingMessageHandler(session);
}
/**
* Set up incoming message handler and initiate streaming.
*
* This method is called once on initiator.
*
* @throws IOException
*/
@SuppressWarnings("resource")
public void initiate() throws IOException
{
logger.debug("[Stream #{}] Sending stream init for incoming stream", session.planId());
Socket incomingSocket = session.createConnection();
incoming.start(incomingSocket, StreamMessage.CURRENT_VERSION, true);
logger.debug("[Stream #{}] Sending stream init for outgoing stream", session.planId());
Socket outgoingSocket = session.createConnection();
outgoing.start(outgoingSocket, StreamMessage.CURRENT_VERSION, true);
}
/**
* Set up outgoing message handler on receiving side.
*
* @param connection Incoming connection to use for {@link OutgoingMessageHandler}.
* @param version Streaming message version
* @throws IOException
*/
public void initiateOnReceivingSide(IncomingStreamingConnection connection, boolean isForOutgoing, int version) throws IOException
{
if (isForOutgoing)
outgoing.start(connection, version);
else
incoming.start(connection, version);
}
public ListenableFuture close()
{
logger.debug("[Stream #{}] Closing stream connection handler on {}", session.planId(), session.peer);
ListenableFuture inClosed = closeIncoming();
ListenableFuture outClosed = closeOutgoing();
return Futures.allAsList(inClosed, outClosed);
}
public ListenableFuture closeOutgoing()
{
return outgoing == null ? Futures.immediateFuture(null) : outgoing.close();
}
public ListenableFuture closeIncoming()
{
return incoming == null ? Futures.immediateFuture(null) : incoming.close();
}
/**
* Enqueue messages to be sent.
*
* @param messages messages to send
*/
public void sendMessages(Collection messages)
{
for (StreamMessage message : messages)
sendMessage(message);
}
public void sendMessage(StreamMessage message)
{
if (outgoing.isClosed())
throw new RuntimeException("Outgoing stream handler has been closed");
outgoing.enqueue(message);
}
/**
* @return true if outgoing connection is opened and ready to send messages
*/
public boolean isOutgoingConnected()
{
return outgoing != null && !outgoing.isClosed();
}
abstract static class MessageHandler implements Runnable
{
protected final StreamSession session;
protected int protocolVersion;
protected Socket socket;
private final boolean isOutgoingHandler;
private final AtomicReference> closeFuture = new AtomicReference<>();
private IncomingStreamingConnection incomingConnection;
protected MessageHandler(StreamSession session, boolean isOutgoingHandler)
{
this.session = session;
this.isOutgoingHandler = isOutgoingHandler;
}
protected abstract String name();
@SuppressWarnings("resource")
protected static DataOutputStreamPlus getWriteChannel(Socket socket) throws IOException
{
WritableByteChannel out = socket.getChannel();
// socket channel is null when encrypted(SSL)
if (out == null)
return new WrappedDataOutputStreamPlus(new BufferedOutputStream(socket.getOutputStream()));
return new BufferedDataOutputStreamPlus(out);
}
protected static ReadableByteChannel getReadChannel(Socket socket) throws IOException
{
//we do this instead of socket.getChannel() so socketSoTimeout is respected
return Channels.newChannel(socket.getInputStream());
}
@SuppressWarnings("resource")
public void sendInitMessage() throws IOException
{
StreamInitMessage message = new StreamInitMessage(
FBUtilities.getBroadcastAddress(),
session.sessionIndex(),
session.planId(),
session.description(),
!isOutgoingHandler,
session.keepSSTableLevel(),
session.isIncremental());
ByteBuffer messageBuf = message.createMessage(false, protocolVersion);
DataOutputStreamPlus out = getWriteChannel(socket);
out.write(messageBuf);
out.flush();
}
public void start(IncomingStreamingConnection connection, int protocolVersion) throws IOException
{
this.incomingConnection = connection;
start(connection.socket, protocolVersion, false);
}
public void start(Socket socket, int protocolVersion, boolean initiator) throws IOException
{
this.socket = socket;
this.protocolVersion = protocolVersion;
if (initiator)
sendInitMessage();
new Thread(NamedThreadFactory.threadLocalDeallocator(this), name() + "-" + session.peer).start();
}
public ListenableFuture close()
{
// Assume it wasn't closed. Not a huge deal if we create a future on a race
SettableFuture future = SettableFuture.create();
return closeFuture.compareAndSet(null, future)
? future
: closeFuture.get();
}
public boolean isClosed()
{
return closeFuture.get() != null;
}
protected void signalCloseDone()
{
if (!isClosed())
close();
closeFuture.get().set(null);
// We can now close the socket
if (incomingConnection != null)
{
//this will close the underlying socket and remove it
//from active MessagingService connections (CASSANDRA-11854)
incomingConnection.close();
}
else
{
//this is an outgoing connection not registered in the MessagingService
//so we can close the socket directly
try
{
socket.close();
}
catch (IOException e)
{
// Erroring out while closing shouldn't happen but is not really a big deal, so just log
// it at DEBUG and ignore otherwise.
logger.debug("Unexpected error while closing streaming connection", e);
}
}
}
}
/**
* Incoming streaming message handler
*/
static class IncomingMessageHandler extends MessageHandler
{
IncomingMessageHandler(StreamSession session)
{
super(session, false);
}
protected String name()
{
return "STREAM-IN";
}
@SuppressWarnings("resource")
public void run()
{
try
{
ReadableByteChannel in = getReadChannel(socket);
while (!isClosed())
{
// receive message
StreamMessage message = StreamMessage.deserialize(in, protocolVersion, session);
logger.debug("[Stream #{}] Received {}", session.planId(), message);
// Might be null if there is an error during streaming (see FileMessage.deserialize). It's ok
// to ignore here since we'll have asked for a retry.
if (message != null)
{
session.messageReceived(message);
}
}
}
catch (Throwable t)
{
JVMStabilityInspector.inspectThrowable(t);
session.onError(t);
}
finally
{
signalCloseDone();
}
}
}
/**
* Outgoing file transfer thread
*/
static class OutgoingMessageHandler extends MessageHandler
{
/*
* All out going messages are queued up into messageQueue.
* The size will grow when received streaming request.
*
* Queue is also PriorityQueue so that prior messages can go out fast.
*/
private final PriorityBlockingQueue messageQueue = new PriorityBlockingQueue<>(64, new Comparator()
{
public int compare(StreamMessage o1, StreamMessage o2)
{
return o2.getPriority() - o1.getPriority();
}
});
OutgoingMessageHandler(StreamSession session)
{
super(session, true);
}
protected String name()
{
return "STREAM-OUT";
}
public void enqueue(StreamMessage message)
{
messageQueue.put(message);
}
@SuppressWarnings("resource")
public void run()
{
try
{
DataOutputStreamPlus out = getWriteChannel(socket);
StreamMessage next;
while (!isClosed())
{
if ((next = messageQueue.poll(1, TimeUnit.SECONDS)) != null)
{
logger.debug("[Stream #{}] Sending {}", session.planId(), next);
sendMessage(out, next);
if (next.type == StreamMessage.Type.SESSION_FAILED)
close();
}
}
// Sends the last messages on the queue
while ((next = messageQueue.poll()) != null)
sendMessage(out, next);
}
catch (InterruptedException e)
{
throw new AssertionError(e);
}
catch (Throwable e)
{
session.onError(e);
}
finally
{
signalCloseDone();
}
}
private void sendMessage(DataOutputStreamPlus out, StreamMessage message)
{
try
{
StreamMessage.serialize(message, out, protocolVersion, session);
out.flush();
}
catch (SocketException e)
{
session.onError(e);
close();
}
catch (IOException e)
{
session.onError(e);
}
}
}
}