/*
* Copyright 1999-2006 University of Chicago
*
* Licensed 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.dcache.ftp.client.dc;
import org.dcache.ftp.client.Session;
import org.dcache.ftp.client.DataSource;
import org.dcache.ftp.client.DataSink;
import org.dcache.ftp.client.GridFTPSession;
import org.dcache.ftp.client.vanilla.FTPServerFacade;
import org.dcache.ftp.client.vanilla.BasicServerControlChannel;
import java.net.ServerSocket;
import java.net.Socket;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* This task will wait on the local server for the new incoming connection
* and when it comes it will start a new transfer thread on the new connection.
* It is little tricky: it will cause data channel to start
* a new thread. By the time this task completes, the new
* thread is running the transfer.
* <p>
* Any resulting exceptions are piped to the local control channel.
**/
public class PassiveConnectTask extends Task
{
protected static final Logger logger =
LoggerFactory.getLogger(PassiveConnectTask.class);
protected ServerSocket myServer;
protected SocketBox mySocketBox;
protected DataSink sink;
protected DataSource source;
protected BasicServerControlChannel control;
protected Session session;
protected DataChannelFactory factory;
protected TransferContext context;
public PassiveConnectTask(ServerSocket myServer,
DataSink sink,
BasicServerControlChannel control,
Session session,
DataChannelFactory factory,
TransferContext context)
{
this.sink = sink;
init(myServer, control, session, factory, context);
}
public PassiveConnectTask(ServerSocket myServer,
DataSource source,
BasicServerControlChannel control,
Session session,
DataChannelFactory factory,
TransferContext context)
{
this.source = source;
init(myServer, control, session, factory, context);
}
private void init(ServerSocket myServer,
BasicServerControlChannel control,
Session session,
DataChannelFactory factory,
TransferContext context)
{
if (!(session.serverMode == Session.SERVER_PASSIVE
|| session.serverMode == GridFTPSession.SERVER_EPAS)) {
throw new IllegalStateException();
}
if (myServer == null) {
throw new IllegalArgumentException("server is nul");
}
this.session = session;
this.myServer = myServer;
this.control = control;
this.factory = factory;
this.context = context;
}
@Override
public void execute()
{
try {
DataChannel dataChannel = null;
mySocketBox = null;
try {
mySocketBox = openSocket();
} catch (Exception e) {
FTPServerFacade.exceptionToControlChannel(
e,
"server.accept() failed",
control);
return;
}
try {
dataChannel = factory.getDataChannel(session, mySocketBox);
if (sink != null) {
logger.debug("starting sink data channel");
dataChannel.startTransfer(sink, control, context);
} else if (source != null) {
logger.debug("starting source data channel");
dataChannel.startTransfer(source, control, context);
} else {
logger.error("not set");
}
} catch (Exception e) {
FTPServerFacade.exceptionToControlChannel(
e,
"startTransfer() failed: ",
control);
if (dataChannel != null) {
dataChannel.close();
}
}
} catch (Exception e) {
FTPServerFacade.cannotPropagateError(e);
}
}
/**
* Override this to implement authentication
**/
protected SocketBox openSocket() throws Exception
{
logger.debug("server.accept()");
SocketBox sBox = new SimpleSocketBox();
Socket newSocket = myServer.accept();
sBox.setSocket(newSocket);
return sBox;
}
private void close()
{
// server will by closed by the FTPServerFacade.
try {
myServer.close();
} catch (Exception ignore) {
}
}
@Override
public void stop()
{
close();
}
}