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/*******************************************************************************
* Copyright (c) 2014 Wind River Systems, Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Markus Schorn - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.tcf.remote.core.operation;
import static java.text.MessageFormat.format;
import static java.util.Collections.emptyList;
import static java.util.Collections.singletonList;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.tcf.protocol.IChannel;
import org.eclipse.tcf.protocol.IChannel.IChannelListener;
import org.eclipse.tcf.protocol.IPeer;
import org.eclipse.tcf.protocol.IToken;
import org.eclipse.tcf.protocol.Protocol;
import org.eclipse.tcf.services.IFileSystem;
import org.eclipse.tcf.services.IFileSystem.DoneUser;
import org.eclipse.tcf.services.IFileSystem.FileSystemException;
import org.eclipse.tcf.te.core.interfaces.IConnectable;
import org.eclipse.tcf.te.tcf.core.Tcf;
import org.eclipse.tcf.te.tcf.core.interfaces.IChannelManager;
import org.eclipse.tcf.te.tcf.core.interfaces.IChannelManager.DoneOpenChannel;
import org.eclipse.tcf.te.tcf.locator.interfaces.nodes.IPeerNode;
import org.eclipse.tcf.te.tcf.remote.core.Activator;
public final class PeerInfo implements IChannelListener {
private IFileSystem fFileSystem;
private boolean fPendingOpen;
private List<DoneGetFileSystem> fCallbacks = emptyList();
private User fUser;
public interface DoneGetFileSystem {
void done(IFileSystem fileSystem, IStatus status);
}
public void getFileSystem(final IPeerNode peerNode, final DoneGetFileSystem callback) {
assert Protocol.isDispatchThread();
if (peerNode.getConnectState() != IConnectable.STATE_CONNECTED) {
callback.done(null, errorStatus(format(Messages.PeerInfo_errorPeerNotConnected, peerNode.getName()), null));
} else if (fFileSystem != null) {
callback.done(fFileSystem, Status.OK_STATUS);
} else {
openChannel(peerNode, callback);
}
}
public void openChannel(final IPeerNode peerNode, final DoneGetFileSystem callback) {
if (fCallbacks.isEmpty()) {
fCallbacks = singletonList(callback);
} else {
if (fCallbacks.size() == 1) {
fCallbacks = new ArrayList<DoneGetFileSystem>(fCallbacks);
}
fCallbacks.add(callback);
}
if (fPendingOpen)
return;
// Open the channel
fPendingOpen = true;
final IPeer peer = peerNode.getPeer();
Map<String, Boolean> flags = new HashMap<String, Boolean>();
flags.put(IChannelManager.FLAG_NO_PATH_MAP, Boolean.TRUE);
flags.put(IChannelManager.FLAG_FORCE_NEW, Boolean.TRUE);
Tcf.getChannelManager().openChannel(peer, flags, new DoneOpenChannel() {
@Override
@SuppressWarnings("synthetic-access")
public void doneOpenChannel(Throwable error, IChannel channel) {
fPendingOpen = false;
IStatus fsStatus = Status.OK_STATUS;
if (error != null) {
fsStatus = errorStatus(format(Messages.PeerInfo_errorCannotOpenChannel, peer.getName()), error);
} else {
channel.addChannelListener(PeerInfo.this);
fFileSystem = channel.getRemoteService(IFileSystem.class);
if (fFileSystem == null) {
fsStatus = errorStatus(format(Messages.PeerInfo_errorNoFileSystemService, peer.getName()), null);
}
}
for (DoneGetFileSystem callback : fCallbacks) {
callback.done(fFileSystem, fsStatus);
}
}
});
}
private IStatus errorStatus(String msg, Throwable cause) {
return new Status(IStatus.ERROR, Activator.ID, msg, cause);
}
@Override
public void congestionLevel(int level) {
}
@Override
public void onChannelOpened() {
}
@Override
public void onChannelClosed(Throwable error) {
// Connection was closed, next time we attempt to open a channel again.
fFileSystem = null;
fCallbacks = emptyList();
}
public interface DoneGetUser {
void done(User user, IStatus status);
}
public final class User {
public final int fEffectiveGID;
public final int fEffectiveUID;
User(int effectiveUID, int effectiveGID) {
fEffectiveUID = effectiveUID;
fEffectiveGID = effectiveGID;
}
}
public void getUser(final IFileSystem fs, final DoneGetUser callback) {
assert Protocol.isDispatchThread();
if (fUser != null) {
callback.done(fUser, Status.OK_STATUS);
return;
}
fs.user(new DoneUser() {
@Override
@SuppressWarnings("synthetic-access")
public void doneUser(IToken token, FileSystemException error, int realUID, int effectiveUID, int realGID, int effectiveGID, String home) {
if (error != null) {
callback.done(null, errorStatus(error.getMessage(), error));
} else {
fUser = new User(effectiveUID, effectiveGID);
callback.done(fUser, Status.OK_STATUS);
}
}
});
}
}
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