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Code Issues Wiki Activity

Bug 300394 - [ftp] Deadlock due to NOOP command not receiving response on the main thread

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This commit is contained in:
Martin Oberhuber 2010-03-15 23:21:57 +00:00
parent 823cdb89d3
commit a2aca046c9
3 changed files with 61 additions and 21 deletions
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2
releng/org.eclipse.rse.build/maps/rse.map
View file

@ -35,7 +35,7 @@ plugin@org.eclipse.rse.importexport=v201003010830,:pserver:anonymous:none@dev.ec
plugin@org.eclipse.rse.processes.ui=v201003010830,:pserver:anonymous:none@dev.eclipse.org:/cvsroot/dsdp,,org.eclipse.tm.rse/plugins/org.eclipse.rse.processes.ui
plugin@org.eclipse.rse.sdk=v201003151933,:pserver:anonymous:none@dev.eclipse.org:/cvsroot/dsdp,,org.eclipse.tm.rse/plugins/org.eclipse.rse.sdk
plugin@org.eclipse.rse.services.dstore=v201003151238,:pserver:anonymous:none@dev.eclipse.org:/cvsroot/dsdp,,org.eclipse.tm.rse/plugins/org.eclipse.rse.services.dstore
plugin@org.eclipse.rse.services.files.ftp=v201003151933,:pserver:anonymous:none@dev.eclipse.org:/cvsroot/dsdp,,org.eclipse.tm.rse/plugins/org.eclipse.rse.services.files.ftp
plugin@org.eclipse.rse.services.files.ftp=v201003152220,:pserver:anonymous:none@dev.eclipse.org:/cvsroot/dsdp,,org.eclipse.tm.rse/plugins/org.eclipse.rse.services.files.ftp
plugin@org.eclipse.rse.services.local=v201003010830,:pserver:anonymous:none@dev.eclipse.org:/cvsroot/dsdp,,org.eclipse.tm.rse/plugins/org.eclipse.rse.services.local
plugin@org.eclipse.rse.services.ssh=v200909160005,:pserver:anonymous:none@dev.eclipse.org:/cvsroot/dsdp,,org.eclipse.tm.rse/plugins/org.eclipse.rse.services.ssh
plugin@org.eclipse.rse.services.telnet=v200905272300,:pserver:anonymous:none@dev.eclipse.org:/cvsroot/dsdp,,org.eclipse.tm.rse/plugins/org.eclipse.rse.services.telnet

4
releng/org.eclipse.rse.build/template/buildNotes.php
View file

@ -42,6 +42,10 @@
<li>A regression in the Terminal widget was fixed, which made initial output after login
invisible above the initial viewport
[<a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=294327">294327</a>].</li>
<li>FTP performance was strongly improved and made more reliable, by eliminating
potential race conditions and lockups due to excessive sending of NOOP commands
[<a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=269171">269171</a>]
[<a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=300394">300394</a>].</li>
<li>EFS provider performance was improved, and multiple connections to a host can
now be disambiguated by name
[<a href="https://bugs.eclipse.org/bugs/show_bug.cgi?id=291738">291738</a>]

76
rse/plugins/org.eclipse.rse.services.files.ftp/src/org/eclipse/rse/internal/services/files/ftp/FTPService.java
View file

@ -144,6 +144,8 @@ import org.eclipse.rse.services.files.RemoteFileSecurityException;
public class FTPService extends AbstractFileService implements IFTPService, IFilePermissionsService
{
private FTPClient _ftpClient;
private long _ftpLastCheck;
private static long FTP_CONNECTION_CHECK_TIMEOUT = 30000; //msec before checking connection with NOOP
private FTPFile[] _ftpFiles;
private Mutex _commandMutex = new Mutex();
@ -335,7 +337,7 @@ public class FTPService extends AbstractFileService implements IFTPService, IFil
protected String checkEncoding(String s) throws SystemMessageException {
if (s == null || s.length() == 0)
return s;
String encoding = _controlEncoding!=null ? _controlEncoding : getFTPClient().getControlEncoding();
String encoding = _controlEncoding!=null ? _controlEncoding : getFTPClient(false).getControlEncoding();
try {
byte[] bytes = s.getBytes(encoding);
String decoded = new String(bytes, encoding);
@ -383,7 +385,7 @@ public class FTPService extends AbstractFileService implements IFTPService, IFil
}
}
if(_ftpLoggingOutputStream!=null)
if(_ftpLoggingOutputStream!=null && _ftpProtocolCommandListener==null)
{
_ftpProtocolCommandListener = new ProtocolCommandListener() {
@ -497,14 +499,20 @@ public class FTPService extends AbstractFileService implements IFTPService, IFil
clearCache(null);
try
{
getFTPClient().logout();
_ftpClient = null;
if (_ftpClient!=null) {
//no use connecting through NOOP as side-effect
//of getFtpClient() just to disconnect
_ftpClient.logout();
}
}
catch (IOException e)
{
}
finally {
_ftpClient = null;
//force checking connection with NOOP on reconnect
_ftpLastCheck = 0;
_ftpProtocolCommandListener = null;
}
}
@ -527,16 +535,38 @@ public class FTPService extends AbstractFileService implements IFTPService, IFil
}
}
/**
* Returns the commons.net FTPClient for this session.
*
* As a side effect, it also checks the connection
* by sending a NOOP to the remote side, and initiates
* a connect in case the NOOP throws an exception.
*
* In order to avoid race conditions by this sending
* of NOOP and its related return code, this sending
* of NOOP must always be protected by a command mutex.
*
* @return The commons.net FTPClient.
*/
public FTPClient getFTPClient()
public FTPClient getFTPClient() {
return getFTPClient(true);
}
/**
* Returns the commons.net FTPClient for this session.
*
* @param checkConnection <code>true</code> to request
* sending a NOOP command as a side-effect in order
* to check connection or re-connect.
* When this is done, the call must be protected
* by a command mutex in order to avoid race conditions
* between sending the NOOP command and awaiting its
* response.
*
* @return The commons.net FTPClient.
*/
public FTPClient getFTPClient(boolean checkConnection)
{
if (_ftpClient == null)
{
@ -547,14 +577,18 @@ public class FTPService extends AbstractFileService implements IFTPService, IFil
}
}
if(_hostName!=null)
if(_hostName!=null && checkConnection)
{
try{
_ftpClient.sendNoOp();
}catch (IOException e){
try {
connect();
} catch (Exception e1) {}
long curTime = System.currentTimeMillis();
if (curTime - _ftpLastCheck > FTP_CONNECTION_CHECK_TIMEOUT) {
_ftpLastCheck = curTime;
try{
_ftpClient.sendNoOp();
}catch (IOException e){
try {
connect();
} catch (Exception e1) {}
}
}
}
@ -669,8 +703,8 @@ public class FTPService extends AbstractFileService implements IFTPService, IFil
{
try {
//try to retrieve the file
_ftpClient = getFTPClient();
chdir(_ftpClient, remoteParent);
FTPClient ftpc = getFTPClient();
chdir(ftpc, remoteParent);
if(!listFiles(monitor))
{
throw new SystemOperationCancelledException();
@ -762,8 +796,8 @@ public class FTPService extends AbstractFileService implements IFTPService, IFil
filematcher = new NamePatternMatcher(fileFilter, true, true);
}
_ftpClient = getFTPClient();
chdir(_ftpClient, parentPath);
FTPClient ftpc = getFTPClient();
chdir(ftpc, parentPath);
if(!listFiles(monitor))
{
throw new SystemOperationCancelledException();
@ -1630,8 +1664,9 @@ public class FTPService extends AbstractFileService implements IFTPService, IFil
} else if(_commandMutex.waitForLock(monitor, Long.MAX_VALUE)) {
try {
clearCache(parent);
if (!_ftpClient.sendSiteCommand("CHMOD " + newPermissions + " " + file.getAbsolutePath())) { //$NON-NLS-1$ //$NON-NLS-2$
String lastMessage = _ftpClient.getReplyString();
FTPClient ftpc = getFTPClient();
if (!ftpc.sendSiteCommand("CHMOD " + newPermissions + " " + file.getAbsolutePath())) { //$NON-NLS-1$ //$NON-NLS-2$
String lastMessage = ftpc.getReplyString();
throw new RemoteFileSecurityException(new Exception(lastMessage));
}
} catch (IOException e) {
@ -1776,8 +1811,9 @@ public class FTPService extends AbstractFileService implements IFTPService, IFil
if (_commandMutex.waitForLock(monitor, Long.MAX_VALUE)) {
try {
clearCache(inFile.getParentPath());
if (!_ftpClient.sendSiteCommand("CHMOD " + s + " " + inFile.getAbsolutePath())) { //$NON-NLS-1$ //$NON-NLS-2$
String lastMessage = _ftpClient.getReplyString();
FTPClient ftpc = getFTPClient();
if (!ftpc.sendSiteCommand("CHMOD " + s + " " + inFile.getAbsolutePath())) { //$NON-NLS-1$ //$NON-NLS-2$
String lastMessage = ftpc.getReplyString();
throw new RemoteFileSecurityException(new Exception(lastMessage));
}
} catch (IOException e) {