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/*
* JBoss, Home of Professional Open Source
* Copyright 2011, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.remoting3.remote;
import static org.jboss.remoting3.remote.RemoteLogger.log;
import static org.jboss.logging.Logger.Level.*;
import java.io.IOException;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.security.Principal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Random;
import java.util.concurrent.atomic.AtomicIntegerFieldUpdater;
import javax.net.ssl.SSLSession;
import org.jboss.remoting3.Channel;
import org.jboss.remoting3.NotOpenException;
import org.jboss.remoting3.ProtocolException;
import org.jboss.remoting3.RemotingOptions;
import org.jboss.remoting3.ServiceOpenException;
import org.jboss.remoting3.security.UserInfo;
import org.jboss.remoting3.spi.AbstractHandleableCloseable;
import org.jboss.remoting3.spi.ConnectionHandler;
import org.jboss.remoting3.spi.ConnectionHandlerContext;
import org.xnio.Bits;
import org.xnio.Cancellable;
import org.xnio.IoUtils;
import org.xnio.OptionMap;
import org.xnio.Pooled;
import org.xnio.Result;
import org.xnio.channels.ConnectedMessageChannel;
import org.xnio.channels.SslChannel;
final class RemoteConnectionHandler extends AbstractHandleableCloseable implements ConnectionHandler {
private final ConnectionHandlerContext connectionContext;
private final RemoteConnection remoteConnection;
/**
* Channels. Remote channel IDs are read with a "1" MSB and written with a "0" MSB.
* Local channel IDs are read with a "0" MSB and written with a "1" MSB. Channel IDs here
* are stored from the "write" perspective. Remote channels "0", Local channels "1" MSB.
*/
private final IntIndexMap channels = new IntIndexHashMap(RemoteConnectionChannel.INDEXER, Equaller.IDENTITY);
/**
* Pending channels. All have a "1" MSB. Replies are read with a "0" MSB.
*/
private final IntIndexMap pendingChannels = new IntIndexHashMap(PendingChannel.INDEXER, Equaller.IDENTITY);
private final Collection principals;
private final UserInfo userInfo;
private final int maxInboundChannels;
private final int maxOutboundChannels;
private final String remoteEndpointName;
private final int behavior;
private volatile int channelState = 0;
private static final AtomicIntegerFieldUpdater channelStateUpdater = AtomicIntegerFieldUpdater.newUpdater(RemoteConnectionHandler.class, "channelState");
/** Sending close request, now shutting down the write side of all channels and refusing new channels. Once send, received = true and count == 0, shut down writes on the socket. */
private static final int SENT_CLOSE_REQ = (1 << 31);
/** Received close request. Send a close req if we haven't already done so. */
private static final int RECEIVED_CLOSE_REQ = (1 << 30);
private static final int OUTBOUND_CHANNELS_MASK = (1 << 15) - 1;
private static final int ONE_OUTBOUND_CHANNEL = 1;
private static final int INBOUND_CHANNELS_MASK = ((1 << 30) - 1) & ~OUTBOUND_CHANNELS_MASK;
private static final int ONE_INBOUND_CHANNEL = (1 << 15);
RemoteConnectionHandler(final ConnectionHandlerContext connectionContext, final RemoteConnection remoteConnection, final Collection principals, final UserInfo userInfo, final int maxInboundChannels, final int maxOutboundChannels, final String remoteEndpointName, final int behavior) {
super(remoteConnection.getExecutor());
this.connectionContext = connectionContext;
this.remoteConnection = remoteConnection;
this.maxInboundChannels = maxInboundChannels;
this.maxOutboundChannels = maxOutboundChannels;
this.remoteEndpointName = remoteEndpointName;
this.behavior = behavior;
this.principals = Collections.unmodifiableCollection(principals);
this.userInfo = userInfo;
}
/**
* The socket channel was closed with or without our consent.
*/
void handleConnectionClose() {
sendCloseRequest();
closePendingChannels();
closeAllChannels();
remoteConnection.shutdownWrites();
IoUtils.safeShutdownReads(remoteConnection.getChannel());
remoteConnection.getRemoteConnectionProvider().removeConnectionHandler(this);
closeComplete();
}
/**
* A channel was closed, locally or remotely.
*
* @param channel the channel that was closed
*/
void handleChannelClosed(RemoteConnectionChannel channel) {
int channelId = channel.getChannelId();
channels.remove(channel);
boolean inbound = (channelId & 0x80000000) == 0;
if (inbound) {
handleInboundChannelClosed();
} else {
handleOutboundChannelClosed();
}
}
void handleInboundChannelClosed() {
int oldState;
oldState = incrementState(-ONE_INBOUND_CHANNEL);
if (oldState == (SENT_CLOSE_REQ | RECEIVED_CLOSE_REQ)) {
log.tracef("Closed inbound channel on %s (shutting down)", this);
remoteConnection.shutdownWrites();
} else {
log.tracef("Closed inbound channel on %s", this);
}
}
void handleOutboundChannelClosed() {
int oldState;
oldState = incrementState(-ONE_OUTBOUND_CHANNEL);
if (oldState == (SENT_CLOSE_REQ | RECEIVED_CLOSE_REQ)) {
log.tracef("Closed outbound channel on %s (shutting down)", this);
remoteConnection.shutdownWrites();
} else {
log.tracef("Closed outbound channel on %s", this);
}
}
boolean handleInboundChannelOpen() {
int oldState, newState;
do {
oldState = channelState;
int oldCount = oldState & INBOUND_CHANNELS_MASK;
if (oldCount == maxInboundChannels) {
log.tracef("Refused inbound channel request on %s because too many inbound channels are open", this);
return false;
}
if ((oldState & SENT_CLOSE_REQ) != 0) {
log.tracef("Refused inbound channel request on %s because close request was sent", this);
return false;
}
newState = oldState + ONE_INBOUND_CHANNEL;
} while (!casState(oldState, newState));
log.tracef("Opened inbound channel on %s", this);
return true;
}
void handleOutboundChannelOpen() throws IOException {
int oldState, newState;
do {
oldState = channelState;
int oldCount = oldState & OUTBOUND_CHANNELS_MASK;
if (oldCount == maxOutboundChannels) {
log.tracef("Refused outbound channel open on %s because too many outbound channels are open", this);
throw new ProtocolException("Too many channels open");
}
if ((oldState & SENT_CLOSE_REQ) != 0) {
log.tracef("Refused outbound channel open on %s because close request was sent", this);
throw new NotOpenException("Cannot open new channel because close was initiated");
}
newState = oldState + ONE_OUTBOUND_CHANNEL;
} while (!casState(oldState, newState));
log.tracef("Opened outbound channel on %s", this);
}
/**
* The remote side requests a close of the whole channel.
*/
void receiveCloseRequest() {
int oldState, newState;
do {
oldState = channelState;
if ((oldState & RECEIVED_CLOSE_REQ) != 0) {
// ignore duplicate, weird though it may be
return;
}
newState = oldState | RECEIVED_CLOSE_REQ | SENT_CLOSE_REQ;
} while (!casState(oldState, newState));
closePendingChannels();
log.tracef("Received remote close request on %s", this);
if ((oldState & SENT_CLOSE_REQ) == 0) {
sendCloseRequestBody();
closeAllChannels();
}
if ((oldState & (INBOUND_CHANNELS_MASK | OUTBOUND_CHANNELS_MASK)) == 0) {
remoteConnection.shutdownWrites();
}
}
void sendCloseRequest() {
int oldState, newState;
do {
oldState = channelState;
if ((oldState & SENT_CLOSE_REQ) != 0) {
// idempotent close
return;
}
newState = oldState | SENT_CLOSE_REQ;
} while (!casState(oldState, newState));
log.tracef("Sending close request on %s", this);
sendCloseRequestBody();
closeAllChannels();
if ((oldState & (INBOUND_CHANNELS_MASK | OUTBOUND_CHANNELS_MASK)) == 0) {
remoteConnection.shutdownWrites();
}
}
private int incrementState(final int count) {
final int oldState = channelStateUpdater.getAndAdd(this, count);
if (log.isTraceEnabled()) {
final int newState = oldState + count;
log.tracef("CAS %s\n\told: RS=%s WS=%s IC=%d OC=%d\n\tnew: RS=%s WS=%s IC=%d OC=%d", this,
Boolean.valueOf((oldState & RECEIVED_CLOSE_REQ) != 0),
Boolean.valueOf((oldState & SENT_CLOSE_REQ) != 0),
Integer.valueOf((oldState & INBOUND_CHANNELS_MASK) >> Integer.numberOfTrailingZeros(ONE_INBOUND_CHANNEL)),
Integer.valueOf((oldState & OUTBOUND_CHANNELS_MASK) >> Integer.numberOfTrailingZeros(ONE_OUTBOUND_CHANNEL)),
Boolean.valueOf((newState & RECEIVED_CLOSE_REQ) != 0),
Boolean.valueOf((newState & SENT_CLOSE_REQ) != 0),
Integer.valueOf((newState & INBOUND_CHANNELS_MASK) >> Integer.numberOfTrailingZeros(ONE_INBOUND_CHANNEL)),
Integer.valueOf((newState & OUTBOUND_CHANNELS_MASK) >> Integer.numberOfTrailingZeros(ONE_OUTBOUND_CHANNEL))
);
}
return oldState;
}
private boolean casState(final int oldState, final int newState) {
final boolean result = channelStateUpdater.compareAndSet(this, oldState, newState);
if (result && log.isTraceEnabled()) {
log.tracef("CAS %s\n\told: RS=%s WS=%s IC=%d OC=%d\n\tnew: RS=%s WS=%s IC=%d OC=%d", this,
Boolean.valueOf((oldState & RECEIVED_CLOSE_REQ) != 0),
Boolean.valueOf((oldState & SENT_CLOSE_REQ) != 0),
Integer.valueOf((oldState & INBOUND_CHANNELS_MASK) >> Integer.numberOfTrailingZeros(ONE_INBOUND_CHANNEL)),
Integer.valueOf((oldState & OUTBOUND_CHANNELS_MASK) >> Integer.numberOfTrailingZeros(ONE_OUTBOUND_CHANNEL)),
Boolean.valueOf((newState & RECEIVED_CLOSE_REQ) != 0),
Boolean.valueOf((newState & SENT_CLOSE_REQ) != 0),
Integer.valueOf((newState & INBOUND_CHANNELS_MASK) >> Integer.numberOfTrailingZeros(ONE_INBOUND_CHANNEL)),
Integer.valueOf((newState & OUTBOUND_CHANNELS_MASK) >> Integer.numberOfTrailingZeros(ONE_OUTBOUND_CHANNEL))
);
}
return result;
}
private void sendCloseRequestBody() {
sendCloseRequestBody(remoteConnection);
log.tracef("Sent close request on %s", this);
}
static void sendCloseRequestBody(RemoteConnection remoteConnection) {
final Pooled pooled = remoteConnection.allocate();
boolean ok = false;
try {
final ByteBuffer buffer = pooled.getResource();
buffer.put(Protocol.CONNECTION_CLOSE);
buffer.flip();
remoteConnection.send(pooled, true);
ok = true;
} finally {
if (! ok) {
pooled.free();
}
}
}
public Cancellable open(final String serviceType, final Result result, final OptionMap optionMap) {
log.tracef("Requesting service open of type %s on %s", serviceType, this);
byte[] serviceTypeBytes = serviceType.getBytes(Protocol.UTF_8);
final int serviceTypeLength = serviceTypeBytes.length;
if (serviceTypeLength > 255) {
log.tracef("Rejecting service open of type %s on %s due to service type name being too long", serviceType, this);
result.setException(new ServiceOpenException("Service type name is too long"));
return IoUtils.nullCancellable();
}
int id;
final OptionMap connectionOptionMap = remoteConnection.getOptionMap();
// Request the maximum outbound value if none was specified.
final int outboundWindowSizeOptionValue = connectionOptionMap.get(RemotingOptions.TRANSMIT_WINDOW_SIZE, RemotingOptions.OUTGOING_CHANNEL_DEFAULT_TRANSMIT_WINDOW_SIZE);
final int outboundMessageCountOptionValue = connectionOptionMap.get(RemotingOptions.MAX_OUTBOUND_MESSAGES, RemotingOptions.OUTGOING_CHANNEL_DEFAULT_MAX_OUTBOUND_MESSAGES);
// Restrict the inbound value to defaults if none was specified.
final int inboundWindowSizeOptionValue = connectionOptionMap.get(RemotingOptions.RECEIVE_WINDOW_SIZE, RemotingOptions.OUTGOING_CHANNEL_DEFAULT_RECEIVE_WINDOW_SIZE);
final int inboundMessageCountOptionValue = connectionOptionMap.get(RemotingOptions.MAX_INBOUND_MESSAGES, RemotingOptions.DEFAULT_MAX_INBOUND_MESSAGES);
// Request the maximum message size to defaults if none was specified.
final long outboundMessageSizeOptionValue = connectionOptionMap.get(RemotingOptions.MAX_OUTBOUND_MESSAGE_SIZE, RemotingOptions.DEFAULT_MAX_OUTBOUND_MESSAGE_SIZE);
final long inboundMessageSizeOptionValue = connectionOptionMap.get(RemotingOptions.MAX_INBOUND_MESSAGE_SIZE, RemotingOptions.DEFAULT_MAX_INBOUND_MESSAGE_SIZE);
final int outboundWindowSize = optionMap.get(RemotingOptions.TRANSMIT_WINDOW_SIZE, outboundWindowSizeOptionValue);
final int outboundMessageCount = optionMap.get(RemotingOptions.MAX_OUTBOUND_MESSAGES, outboundMessageCountOptionValue);
final int inboundWindowSize = optionMap.get(RemotingOptions.RECEIVE_WINDOW_SIZE, inboundWindowSizeOptionValue);
final int inboundMessageCount = optionMap.get(RemotingOptions.MAX_INBOUND_MESSAGES, inboundMessageCountOptionValue);
final long outboundMessageSize = optionMap.get(RemotingOptions.MAX_OUTBOUND_MESSAGE_SIZE, outboundMessageSizeOptionValue);
final long inboundMessageSize = optionMap.get(RemotingOptions.MAX_INBOUND_MESSAGE_SIZE, inboundMessageSizeOptionValue);
final IntIndexMap pendingChannels = this.pendingChannels;
try {
handleOutboundChannelOpen();
} catch (IOException e) {
result.setException(e);
return IoUtils.nullCancellable();
}
boolean ok = false;
try {
final Random random = ProtocolUtils.randomHolder.get();
for (;;) {
id = random.nextInt() | 0x80000000;
if (! pendingChannels.containsKey(id)) {
PendingChannel pendingChannel = new PendingChannel(id, outboundWindowSize, inboundWindowSize, outboundMessageCount, inboundMessageCount, outboundMessageSize, inboundMessageSize, result);
if (pendingChannels.putIfAbsent(pendingChannel) == null) {
if (log.isTraceEnabled()) {
log.tracef("Outbound service request for channel %08x is configured as follows:\n" +
" outbound window: option %10d, req %10d\n" +
" inbound window: option %10d, req %10d\n" +
" outbound msgs: option %10d, req %10d\n" +
" inbound msgs: option %10d, req %10d\n" +
" outbound msgsize: option %19d, req %19d\n" +
" inbound msgsize: option %19d, req %19d",
Integer.valueOf(id),
Integer.valueOf(outboundWindowSizeOptionValue), Integer.valueOf(outboundWindowSize),
Integer.valueOf(inboundWindowSizeOptionValue), Integer.valueOf(inboundWindowSize),
Integer.valueOf(outboundMessageCountOptionValue), Integer.valueOf(outboundMessageCount),
Integer.valueOf(inboundMessageCountOptionValue), Integer.valueOf(inboundMessageCount),
Long.valueOf(outboundMessageSizeOptionValue), Long.valueOf(outboundMessageSize),
Long.valueOf(inboundMessageSizeOptionValue), Long.valueOf(inboundMessageSize)
);
}
Pooled pooled = remoteConnection.allocate();
try {
ByteBuffer buffer = pooled.getResource();
buffer.put(Protocol.CHANNEL_OPEN_REQUEST);
buffer.putInt(id);
ProtocolUtils.writeBytes(buffer, Protocol.O_SERVICE_NAME, serviceTypeBytes);
ProtocolUtils.writeInt(buffer, Protocol.O_MAX_INBOUND_MSG_WINDOW_SIZE, inboundWindowSize);
ProtocolUtils.writeShort(buffer, Protocol.O_MAX_INBOUND_MSG_COUNT, inboundMessageCount);
ProtocolUtils.writeInt(buffer, Protocol.O_MAX_OUTBOUND_MSG_WINDOW_SIZE, outboundWindowSize);
ProtocolUtils.writeShort(buffer, Protocol.O_MAX_OUTBOUND_MSG_COUNT, outboundMessageCount);
if (inboundMessageSize != Long.MAX_VALUE) {
ProtocolUtils.writeLong(buffer, Protocol.O_MAX_INBOUND_MSG_SIZE, inboundMessageSize);
}
if (outboundMessageSize != Long.MAX_VALUE) {
ProtocolUtils.writeLong(buffer, Protocol.O_MAX_OUTBOUND_MSG_SIZE, outboundMessageSize);
}
buffer.put((byte) 0);
buffer.flip();
remoteConnection.send(pooled);
ok = true;
log.tracef("Completed initiation of service open of type %s on %s", serviceType, this);
// TODO: allow cancel
return IoUtils.nullCancellable();
} finally {
if (! ok) pooled.free();
}
}
}
}
} finally {
if (! ok) handleOutboundChannelClosed();
}
}
public Collection getPrincipals() {
return principals;
}
public UserInfo getUserInfo() {
return userInfo;
}
public SSLSession getSslSession() {
SslChannel sslChannel = remoteConnection.getSslChannel();
return sslChannel != null ? sslChannel.getSslSession() : null;
}
public String getRemoteEndpointName() {
return remoteEndpointName;
}
protected void closeAction() throws IOException {
handleConnectionClose();
}
private void closePendingChannels() {
final ArrayList list;
synchronized (remoteConnection.getLock()) {
list = new ArrayList(pendingChannels);
}
for (PendingChannel pendingChannel : list) {
pendingChannel.getResult().setCancelled();
}
}
private void closeAllChannels() {
final ArrayList list;
synchronized (remoteConnection.getLock()) {
list = new ArrayList(channels);
}
for (RemoteConnectionChannel channel : list) {
channel.closeAsync();
}
}
ConnectionHandlerContext getConnectionContext() {
return connectionContext;
}
RemoteConnectionChannel addChannel(final RemoteConnectionChannel channel) {
return channels.putIfAbsent(channel);
}
RemoteConnectionChannel getChannel(final int id) {
return channels.get(id);
}
PendingChannel removePendingChannel(final int id) {
return pendingChannels.removeKey(id);
}
void putChannel(final RemoteConnectionChannel channel) {
channels.put(channel);
}
boolean isMessageClose() {
return Bits.allAreSet(behavior, Protocol.BH_MESSAGE_CLOSE);
}
boolean isFaultyMessageSize() {
return Bits.allAreSet(behavior, Protocol.BH_FAULTY_MSG_SIZE);
}
public String toString() {
return String.format("Connection handler for %s", remoteConnection);
}
void dumpState(final StringBuilder b) {
synchronized (remoteConnection.getLock()) {
final int state = this.channelState;
final boolean sentCloseReq = Bits.allAreSet(state, SENT_CLOSE_REQ);
final boolean receivedCloseReq = Bits.allAreSet(state, RECEIVED_CLOSE_REQ);
final int inboundChannels = (state & INBOUND_CHANNELS_MASK) >>> Integer.numberOfTrailingZeros(ONE_INBOUND_CHANNEL);
final int outboundChannels = (state & OUTBOUND_CHANNELS_MASK) >>> Integer.numberOfTrailingZeros(ONE_OUTBOUND_CHANNEL);
final ConnectedMessageChannel channel = remoteConnection.getChannel();
final SocketAddress localAddress = channel.getLocalAddress();
final SocketAddress peerAddress = channel.getPeerAddress();
b.append(" ").append("Connection ").append(localAddress).append(" <-> ").append(peerAddress).append('\n');
b.append(" ").append("Channel: ").append(channel).append('\n');
b.append(" ").append("* Flags: ");
if (Bits.allAreSet(behavior, Protocol.BH_MESSAGE_CLOSE)) b.append("supports-message-close ");
if (Bits.allAreSet(behavior, Protocol.BH_FAULTY_MSG_SIZE)) b.append("remote-faulty-message-size ");
if (receivedCloseReq) b.append("received-close-req ");
if (sentCloseReq) b.append("set-close-req ");
b.append('\n');
b.append(" ").append("* ").append(inboundChannels).append(" (max ").append(maxInboundChannels).append(") inbound channels\n");
b.append(" ").append("* ").append(outboundChannels).append(" (max ").append(maxOutboundChannels).append(") outbound channels\n");
b.append(" ").append("* Channels:\n");
for (RemoteConnectionChannel connectionChannel : channels) {
connectionChannel.dumpState(b);
}
}
}
}
