/*
* Created on 9 Aug 2006
* Created by Paul Gardner
* Copyright (C) 2006 Aelitis, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package org.gudy.azureus2.pluginsimpl.local.messaging;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.core3.util.DirectByteBuffer;
import org.gudy.azureus2.plugins.messaging.MessageException;
import org.gudy.azureus2.plugins.messaging.generic.GenericMessageConnection;
import org.gudy.azureus2.plugins.messaging.generic.GenericMessageConnectionListener;
import org.gudy.azureus2.plugins.messaging.generic.GenericMessageEndpoint;
import org.gudy.azureus2.plugins.utils.PooledByteBuffer;
import org.gudy.azureus2.pluginsimpl.local.utils.PooledByteBufferImpl;
import com.aelitis.azureus.core.nat.NATTraversalObserver;
import com.aelitis.azureus.core.nat.NATTraverser;
public class
GenericMessageConnectionImpl
implements GenericMessageConnection
{
private static final boolean TRACE = false;
private static final boolean TEST_TUNNEL = false;
static{
if ( TEST_TUNNEL ){
System.out.println( "**** GenericMessageConnection: TEST_TUNNEL on ****" );
}
if ( TRACE ){
System.out.println( "**** GenericMessageConnection: TRACE on **** " );
}
}
private MessageManagerImpl message_manager;
private String msg_id;
private String msg_desc;
private GenericMessageEndpointImpl endpoint;
private int stream_crypto;
byte[][] shared_secrets;
private boolean incoming;
private volatile GenericMessageConnectionAdapter delegate;
private volatile boolean closed;
private volatile boolean connecting;
private List listeners = new ArrayList();
protected
GenericMessageConnectionImpl(
MessageManagerImpl _message_manager,
GenericMessageConnectionAdapter _delegate )
{
message_manager = _message_manager;
delegate = _delegate;
incoming = true;
delegate.setOwner( this );
}
protected
GenericMessageConnectionImpl(
MessageManagerImpl _message_manager,
String _msg_id,
String _msg_desc,
GenericMessageEndpointImpl _endpoint,
int _stream_crypto,
byte[][] _shared_secrets )
{
message_manager = _message_manager;
msg_id = _msg_id;
msg_desc = _msg_desc;
endpoint = _endpoint;
stream_crypto = _stream_crypto;
shared_secrets = _shared_secrets;
incoming = false;
}
public GenericMessageEndpoint
getEndpoint()
{
return( endpoint==null?delegate.getEndpoint():endpoint);
}
public int
getMaximumMessageSize()
{
return( delegate==null?GenericMessageConnectionIndirect.MAX_MESSAGE_SIZE:delegate.getMaximumMessageSize());
}
public boolean
isIncoming()
{
return( incoming );
}
public void
connect()
throws MessageException
{
connect( null );
}
/**
* Outgoing connection
* @param initial_data
* @throws MessageException
*/
public void
connect(
ByteBuffer initial_data )
throws MessageException
{
if ( incoming ){
throw( new MessageException( "Already connected" ));
}
if ( connecting ){
throw( new MessageException( "Connect already performed" ));
}
connecting = true;
if ( closed ){
throw( new MessageException( "Connection has been closed" ));
}
InetSocketAddress tcp_ep = endpoint.getTCP();
if ( tcp_ep != null ){
connectTCP( initial_data, tcp_ep );
}else{
InetSocketAddress udp_ep = endpoint.getUDP();
if ( udp_ep != null ){
connectUDP( initial_data, udp_ep, false );
}else{
throw( new MessageException( "No protocols availabld" ));
}
}
}
protected void
connectTCP(
final ByteBuffer initial_data,
InetSocketAddress tcp_ep )
{
if ( TRACE ){
System.out.println( "TCP connection attempt to " + tcp_ep );
}
GenericMessageEndpointImpl gen_tcp = new GenericMessageEndpointImpl( endpoint.getNotionalAddress());
gen_tcp.addTCP( tcp_ep );
final GenericMessageConnectionDirect tcp_delegate = new GenericMessageConnectionDirect( msg_id, msg_desc, gen_tcp, stream_crypto, shared_secrets );
tcp_delegate.setOwner( this );
tcp_delegate.connect(
initial_data,
new GenericMessageConnectionAdapter.ConnectionListener()
{
public void
connectSuccess()
{
delegate = tcp_delegate;
if ( closed ){
try{
delegate.close();
}catch( Throwable e ){
}
reportFailed( new MessageException( "Connection has been closed" ));
}else{
reportConnected();
}
}
public void
connectFailure(
Throwable failure_msg )
{
InetSocketAddress udp_ep = endpoint.getUDP();
if ( udp_ep != null ){
initial_data.rewind();
connectUDP( initial_data, udp_ep, false );
}else{
reportFailed( failure_msg );
}
}
});
}
protected void
connectUDP(
final ByteBuffer initial_data,
final InetSocketAddress udp_ep,
boolean nat_traversal )
{
if ( TRACE ){
System.out.println( "UDP connection attempt to " + udp_ep + " (nat=" + nat_traversal + ")" );
}
final GenericMessageEndpointImpl gen_udp = new GenericMessageEndpointImpl( endpoint.getNotionalAddress());
gen_udp.addUDP( udp_ep );
final GenericMessageConnectionAdapter udp_delegate = new GenericMessageConnectionDirect( msg_id, msg_desc, gen_udp, stream_crypto, shared_secrets );
udp_delegate.setOwner( this );
if ( nat_traversal || TEST_TUNNEL ){
final NATTraverser nat_traverser = message_manager.getNATTraverser();
Map request = new HashMap();
nat_traverser.attemptTraversal(
message_manager,
udp_ep,
request,
false,
new NATTraversalObserver()
{
public void
succeeded(
final InetSocketAddress rendezvous,
final InetSocketAddress target,
Map reply )
{
if ( closed ){
reportFailed( new MessageException( "Connection has been closed" ));
}else{
if ( TEST_TUNNEL ){
initial_data.rewind();
connectTunnel( initial_data, gen_udp, rendezvous, target );
}else{
udp_delegate.connect(
initial_data,
new GenericMessageConnectionAdapter.ConnectionListener()
{
public void
connectSuccess()
{
delegate = udp_delegate;
if ( closed ){
try{
delegate.close();
}catch( Throwable e ){
}
reportFailed( new MessageException( "Connection has been closed" ));
}else{
reportConnected();
}
}
public void
connectFailure(
Throwable failure_msg )
{
initial_data.rewind();
connectTunnel( initial_data, gen_udp, rendezvous, target );
}
});
}
}
}
public void
failed(
int failure_type )
{
reportFailed( new Throwable( "UDP connection attempt failed - NAT traversal failed, type=" + failure_type ));
}
public void
failed(
Throwable cause )
{
reportFailed( cause );
}
public void
disabled()
{
reportFailed( new Throwable( "UDP connection attempt failed as DDB is disabled" ));
}
});
}else{
udp_delegate.connect(
initial_data,
new GenericMessageConnectionAdapter.ConnectionListener()
{
public void
connectSuccess()
{
delegate = udp_delegate;
if ( closed ){
try{
delegate.close();
}catch( Throwable e ){
}
reportFailed( new MessageException( "Connection has been closed" ));
}else{
reportConnected();
}
}
public void
connectFailure(
Throwable failure_msg )
{
initial_data.rewind();
connectUDP( initial_data, udp_ep, true );
}
});
}
}
protected void
connectTunnel(
ByteBuffer initial_data,
GenericMessageEndpoint ep,
InetSocketAddress rendezvous,
InetSocketAddress target )
{
if ( TRACE ){
System.out.println( "Tunnel connection attempt to " + target + " (rendezvous=" + rendezvous + ")" );
}
final GenericMessageConnectionIndirect tunnel_delegate =
new GenericMessageConnectionIndirect( message_manager, msg_id, msg_desc, ep, rendezvous, target );
tunnel_delegate.setOwner( this );
tunnel_delegate.connect(
initial_data,
new GenericMessageConnectionAdapter.ConnectionListener()
{
public void
connectSuccess()
{
delegate = tunnel_delegate;
if ( closed ){
try{
delegate.close();
}catch( Throwable e ){
}
reportFailed( new MessageException( "Connection has been closed" ));
}else{
reportConnected();
}
}
public void
connectFailure(
Throwable failure_msg )
{
reportFailed( failure_msg );
}
});
}
/**
* Incoming connection has been accepted
*
*/
protected void
accepted()
{
delegate.accepted();
}
public void
send(
PooledByteBuffer message )
throws MessageException
{
int size = ((PooledByteBufferImpl)message).getBuffer().remaining( DirectByteBuffer.SS_EXTERNAL );
if ( size > getMaximumMessageSize()){
throw( new MessageException( "Message is too large: supplied is " + size + ", maximum is " + getMaximumMessageSize()));
}
delegate.send( message );
}
protected void
receive(
GenericMessage message )
{
boolean handled = false;
for (int i=0;i<listeners.size();i++){
PooledByteBuffer buffer = new PooledByteBufferImpl(message.getPayload());
try{
((GenericMessageConnectionListener)listeners.get(i)).receive( this, buffer );
handled = true;
}catch( Throwable f ){
buffer.returnToPool();
Debug.printStackTrace(f);
}
}
if ( !handled ){
Debug.out( "GenericMessage: incoming message not handled" );
}
}
public void
close()
throws MessageException
{
closed = true;
if ( delegate != null ){
delegate.close();
}
}
protected void
reportConnected()
{
for (int i=0;i<listeners.size();i++){
try{
((GenericMessageConnectionListener)listeners.get(i)).connected( this );
}catch( Throwable f ){
Debug.printStackTrace(f);
}
}
}
protected void
reportFailed(
Throwable e )
{
for (int i=0;i<listeners.size();i++){
try{
((GenericMessageConnectionListener)listeners.get(i)).failed( this, e );
}catch( Throwable f ){
Debug.printStackTrace(f);
}
}
}
public void
addListener(
GenericMessageConnectionListener listener )
{
listeners.add( listener );
}
public void
removeListener(
GenericMessageConnectionListener listener )
{
listeners.remove( listener );
}
}
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