/*
* Created on Jul 23, 2005
* Created by Alon Rohter
* Copyright (C) 2005, 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 com.aelitis.azureus.core.peermanager.download.session.impl;
import java.util.*;
import org.gudy.azureus2.core3.util.*;
import com.aelitis.azureus.core.networkmanager.*;
import com.aelitis.azureus.core.peermanager.connection.AZPeerConnection;
import com.aelitis.azureus.core.peermanager.download.TorrentDownload;
import com.aelitis.azureus.core.peermanager.download.session.*;
import com.aelitis.azureus.core.peermanager.messaging.Message;
import com.aelitis.azureus.core.peermanager.messaging.azureus.AZMessage;
import com.aelitis.azureus.core.peermanager.messaging.azureus.session.*;
public class AZTorrentSession implements TorrentSession {
private static int next_session_id = 0;
private static final AEMonitor session_mon = new AEMonitor( "TorrentSession" );
private int local_session_id;
private int remote_session_id;
private final TorrentDownload download;
private final AZPeerConnection peer;
private final TorrentSessionListener listener;
private TimerEvent syn_timeout_timer;
private final IncomingMessageQueue.MessageQueueListener incoming_q_listener = new IncomingMessageQueue.MessageQueueListener() {
public boolean messageReceived( Message message ) {
//ID_AZ_SESSION_ACK
if( message.getID().equals( AZMessage.ID_AZ_SESSION_ACK ) ) {
AZSessionAck ack = (AZSessionAck)message;
if( Arrays.equals( ack.getInfoHash(), download.getInfoHash() ) ) {
remote_session_id = ack.getSessionID(); //capture send-to id
syn_timeout_timer.cancel(); //abort timeout check
try{
download.getSessionAuthenticator().verifySessionAck( peer, ack.getSessionInfo() );
listener.sessionIsEstablished(); //notify of readiness
}
catch( AuthenticatorException ae ) {
end( "AuthenticatorException:: " +ae.getMessage(), true ); //send end message
}
ack.destroy();
return true;
}
}
//ID_AZ_SESSION_END
if( message.getID().equals( AZMessage.ID_AZ_SESSION_END ) ) {
AZSessionEnd end = (AZSessionEnd)message;
if( Arrays.equals( end.getInfoHash(), download.getInfoHash() ) ) {
System.out.println( "AZ_TORRENT_SESSION_END received: " +end.getEndReason() );
listener.sessionIsEnded( end.getEndReason() ); //notify of remote termination
destroy(); //close session
end.destroy();
return true;
}
}
//ID_AZ_SESSION_BITFIELD
if( message.getID().equals( AZMessage.ID_AZ_SESSION_BITFIELD ) ) {
AZSessionBitfield bitf = (AZSessionBitfield)message;
if( bitf.getSessionID() == local_session_id ) {
listener.receivedSessionBitfield( bitf.getBitfield() );
bitf.destroy();
return true;
}
}
//ID_AZ_SESSION_REQUEST
if( message.getID().equals( AZMessage.ID_AZ_SESSION_REQUEST ) ) {
AZSessionRequest req = (AZSessionRequest)message;
if( req.getSessionID() == local_session_id ) {
listener.receivedSessionRequest( req.getUnchokeID(), req.getPieceNumber(), req.getPieceOffset(), req.getLength() );
req.destroy();
return true;
}
}
//ID_AZ_SESSION_CANCEL
if( message.getID().equals( AZMessage.ID_AZ_SESSION_CANCEL ) ) {
AZSessionCancel cancel = (AZSessionCancel)message;
if( cancel.getSessionID() == local_session_id ) {
listener.receivedSessionCancel( cancel.getPieceNumber(), cancel.getPieceOffset(), cancel.getLength() );
cancel.destroy();
return true;
}
}
//ID_AZ_SESSION_HAVE
if( message.getID().equals( AZMessage.ID_AZ_SESSION_HAVE ) ) {
AZSessionHave have = (AZSessionHave)message;
if( have.getSessionID() == local_session_id ) {
int[] piecenums = have.getPieceNumbers();
for( int i=0; i < piecenums.length; i++ ) {
listener.receivedSessionHave( piecenums[i] );
}
have.destroy();
return true;
}
}
//ID_AZ_SESSION_PIECE
if( message.getID().equals( AZMessage.ID_AZ_SESSION_PIECE ) ) {
AZSessionPiece piece = (AZSessionPiece)message;
if( piece.getSessionID() == local_session_id ) {
try{
DirectByteBuffer data = download.getSessionAuthenticator().decodeSessionData( peer, piece.getPieceData() );
listener.receivedSessionPiece( piece.getPieceNumber(), piece.getPieceOffset(), data );
}
catch( AuthenticatorException ae ) {
piece.getPieceData().returnToPool();
end( "AuthenticatorException:: " +ae.getMessage(), true ); //send end message
}
piece.destroy();
return true;
}
}
return false;
}
public void protocolBytesReceived( int byte_count ){}
public void dataBytesReceived( int byte_count ){}
};
private final OutgoingMessageQueue.MessageQueueListener sent_message_listener = new OutgoingMessageQueue.MessageQueueListener() {
public boolean messageAdded( Message message ) { return true; }
public void messageSent( Message message ) {
if( message.getID().equals( AZMessage.ID_AZ_SESSION_PIECE ) ) {
AZSessionPiece piece = (AZSessionPiece)message;
if( piece.getSessionID() == remote_session_id ) {
listener.sentSessionPiece( message );
}
}
}
public void messageQueued( Message message ) {/*nothing*/}
public void messageRemoved( Message message ) {/*nothing*/}
public void protocolBytesSent( int byte_count ) {/*ignore*/}
public void dataBytesSent( int byte_count ) {/*ignore*/}
public void flush(){}
};
public AZTorrentSession( TorrentDownload download, AZPeerConnection peer, TorrentSessionListener listener, int remote_id, Map incoming_syn ) {
this.download = download;
this.peer = peer;
this.remote_session_id = remote_id;
this.listener = listener;
try{ session_mon.enter();
local_session_id = next_session_id;
next_session_id++;
}
finally{ session_mon.exit(); }
peer.getNetworkConnection().getIncomingMessageQueue().registerQueueListener( incoming_q_listener );
peer.getNetworkConnection().getOutgoingMessageQueue().registerQueueListener( sent_message_listener );
authenticate( incoming_syn );
}
private void authenticate( Map incoming_syn ) {
if( incoming_syn == null ) { //outgoing session
//send out the session request
AZSessionSyn syn = new AZSessionSyn( download.getInfoHash(), local_session_id, download.getSessionAuthenticator().createSessionSyn( peer ), (byte)1 );
peer.getNetworkConnection().getOutgoingMessageQueue().addMessage( syn, false );
//set a timeout timer in case the other peer forgets to send an ACK or END reply
syn_timeout_timer = SimpleTimer.addEvent( "AZTorrentSession:SynTImer", SystemTime.getCurrentTime() + 60*1000, new TimerEventPerformer() {
public void perform( TimerEvent event ) {
end( "No session ACK received after 60sec, request timed out.", true );
}
});
}
else { //incoming session
try{
Map ack_reply = download.getSessionAuthenticator().verifySessionSyn( peer, incoming_syn );
//send out the session acceptance
AZSessionAck ack = new AZSessionAck( download.getInfoHash(), local_session_id, ack_reply, (byte)1 );
peer.getNetworkConnection().getOutgoingMessageQueue().addMessage( ack, false );
listener.sessionIsEstablished(); //notify of readiness
}
catch( AuthenticatorException ae ) { //on syn authentication error
end( "AuthenticatorException:: " +ae.getMessage(), true ); //send end message
}
}
}
private void end( String end_reason, boolean notify_listener ){
System.out.println( "endSession:: " +end_reason );
//send end notice to remote peer
AZSessionEnd end = new AZSessionEnd( download.getInfoHash(), end_reason, (byte)1 );
peer.getNetworkConnection().getOutgoingMessageQueue().addMessage( end, false );
if( notify_listener ) {
listener.sessionIsEnded( end_reason ); //notify listener of termination
}
destroy();
}
private void destroy(){
if( syn_timeout_timer != null ) syn_timeout_timer.cancel(); //abort timeout check if running
peer.getNetworkConnection().getIncomingMessageQueue().cancelQueueListener( incoming_q_listener );
peer.getNetworkConnection().getOutgoingMessageQueue().cancelQueueListener( sent_message_listener );
}
public void endSession( String reason ) {
end( reason, false );
}
public void sendSessionBitfield( DirectByteBuffer bitfield ) {
AZSessionBitfield bitf = new AZSessionBitfield( remote_session_id, bitfield, (byte)1 );
peer.getNetworkConnection().getOutgoingMessageQueue().addMessage( bitf, false );
}
public void sendSessionRequest( byte unchoke_id, int piece_number, int piece_offset, int length ) {
AZSessionRequest req = new AZSessionRequest( remote_session_id, unchoke_id, piece_number, piece_offset, length, (byte)1 );
peer.getNetworkConnection().getOutgoingMessageQueue().addMessage( req, false );
}
public void sendSessionCancel( int piece_number, int piece_offset, int length ) {
AZSessionCancel can = new AZSessionCancel( remote_session_id, piece_number, piece_offset, length, (byte)1 );
peer.getNetworkConnection().getOutgoingMessageQueue().addMessage( can, false );
}
public void sendSessionHave( int[] piece_numbers ) {
AZSessionHave have = new AZSessionHave( remote_session_id, piece_numbers, (byte)1 );
peer.getNetworkConnection().getOutgoingMessageQueue().addMessage( have, false );
}
public Object sendSessionPiece( int piece_number, int piece_offset, DirectByteBuffer data ) {
try{
DirectByteBuffer encoded = download.getSessionAuthenticator().encodeSessionData( peer, data );
AZSessionPiece piece = new AZSessionPiece( remote_session_id, piece_number, piece_offset, encoded, (byte)1 );
peer.getNetworkConnection().getOutgoingMessageQueue().addMessage( piece, false );
return piece;
}
catch( AuthenticatorException ae ) {
data.returnToPool();
end( "AuthenticatorException:: " +ae.getMessage(), true ); //send end message
return null;
}
}
}