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Code Issues Wiki Activity

Check session connected when dealing with ssh errors.

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This commit is contained in:
Martin Oberhuber 2006-06-08 12:41:48 +00:00
parent 9f11823b26
commit c564e89d07
1 changed files with 40 additions and 15 deletions
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45
rse/plugins/org.eclipse.rse.services.ssh/src/org/eclipse/rse/services/ssh/files/SftpFileService.java
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@ -15,6 +15,7 @@ import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
@ -30,7 +31,6 @@ import org.eclipse.rse.services.files.IHostFile;
import org.eclipse.rse.services.ssh.Activator;
import org.eclipse.rse.services.ssh.ISshService;
import org.eclipse.rse.services.ssh.ISshSessionProvider;
import org.eclipse.swt.widgets.Display;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
@ -77,25 +77,44 @@ public class SftpFileService extends AbstractFileService implements IFileService
}
}
/**
* Check if the main ssh session is still connected.
* Notify ConnectorService of lost session if necessary.
* @return <code>true</code> if the session is still healthy.
*/
protected boolean checkSessionConnected() {
Session session = fSessionProvider.getSession();
if (session==null) {
// ConnectorService has disconnected already. Nothing to do.
return false;
} else if (session.isConnected()) {
// Session still healthy.
return true;
} else {
// Session was lost, but ConnectorService doesn't know yet.
// notify of lost session. May reconnect asynchronously later.
fSessionProvider.handleSessionLost();
return false;
}
}
protected ChannelSftp getChannel(String task) throws Exception
{
Activator.trace(task);
if (fChannelSftp==null || !fChannelSftp.isConnected()) {
Activator.trace(task + ": channel not connected: "+fChannelSftp); //$NON-NLS-1$
Session session = fSessionProvider.getSession();
if (session!=null) {
if (!session.isConnected()) {
//notify of lost session. May reconnect asynchronously later.
fSessionProvider.handleSessionLost();
//dont throw an exception here, expect jsch to throw something useful
} else {
if (checkSessionConnected()) {
//session connected but channel not: try to reconnect
//(may throw Exception)
connect();
} else {
//session was lost: returned channelSftp will be invalid.
//This will lead to jsch exceptions (NPE, or disconnected)
//which are ignored for now since the connection is about
//to be disconnected anyways.
throw new IOException("jsch session lost");
}
}
//TODO might throw NPE if session has been disconnected
}
return fChannelSftp;
}
@ -174,9 +193,15 @@ public class SftpFileService extends AbstractFileService implements IFileService
//of a symbolic link that turns out to point to a file rather than
//a directory. In this case, the result is probably expected.
//We should try to classify symbolic links as "file" or "dir" correctly.
if (checkSessionConnected()) {
//TODO not quite sure who should really check for session conneced,
//perhaps this should be done in the caller? - If we eventually
//want to support re-connect and re-doing the failed operation
//after reconnect this might be necessary.
Activator.trace("SftpFileService.internalFetch failed: "+e.toString()); //$NON-NLS-1$
e.printStackTrace();
}
}
return (IHostFile[])results.toArray(new IHostFile[results.size()]);
}