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Apache Commons VFS is a Virtual File System library.
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.commons.vfs2.provider.ftp;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileSystemOptions;
import org.apache.commons.vfs2.UserAuthenticationData;
import org.apache.commons.vfs2.provider.GenericFileName;
import org.apache.commons.vfs2.util.UserAuthenticatorUtils;
/**
* A wrapper to the FTPClient to allow automatic reconnect on connection loss.
*
* I decided to not to use eg. noop() to determine the state of the connection to avoid unnecessary server round-trips.
*
*/
public class FTPClientWrapper implements FtpClient {
private static final Log LOG = LogFactory.getLog(FTPClientWrapper.class);
protected final FileSystemOptions fileSystemOptions;
private final GenericFileName root;
private FTPClient ftpClient;
protected FTPClientWrapper(final GenericFileName root, final FileSystemOptions fileSystemOptions)
throws FileSystemException {
this.root = root;
this.fileSystemOptions = fileSystemOptions;
getFtpClient(); // fail-fast
}
public GenericFileName getRoot() {
return root;
}
public FileSystemOptions getFileSystemOptions() {
return fileSystemOptions;
}
private FTPClient createClient() throws FileSystemException {
final GenericFileName rootName = getRoot();
UserAuthenticationData authData = null;
try {
authData = UserAuthenticatorUtils.authenticate(fileSystemOptions, FtpFileProvider.AUTHENTICATOR_TYPES);
return createClient(rootName, authData);
} finally {
UserAuthenticatorUtils.cleanup(authData);
}
}
protected FTPClient createClient(final GenericFileName rootName, final UserAuthenticationData authData)
throws FileSystemException {
return FtpClientFactory.createConnection(rootName.getHostName(), rootName.getPort(),
UserAuthenticatorUtils.getData(authData, UserAuthenticationData.USERNAME,
UserAuthenticatorUtils.toChar(rootName.getUserName())),
UserAuthenticatorUtils.getData(authData, UserAuthenticationData.PASSWORD,
UserAuthenticatorUtils.toChar(rootName.getPassword())),
rootName.getPath(), getFileSystemOptions());
}
private FTPClient getFtpClient() throws FileSystemException {
if (ftpClient == null) {
ftpClient = createClient();
}
return ftpClient;
}
@Override
public boolean isConnected() throws FileSystemException {
return ftpClient != null && ftpClient.isConnected();
}
@Override
public void disconnect() throws IOException {
try {
getFtpClient().quit();
} catch (final IOException e) {
LOG.debug("I/O exception while trying to quit, probably it's a timed out connection, ignoring.", e);
} finally {
try {
getFtpClient().disconnect();
} catch (final IOException e) {
LOG.warn("I/O exception while trying to disconnect, probably it's a closed connection, ignoring.", e);
} finally {
ftpClient = null;
}
}
}
@Override
public FTPFile[] listFiles(final String relPath) throws IOException {
try {
// VFS-210: return getFtpClient().listFiles(relPath);
final FTPFile[] files = listFilesInDirectory(relPath);
return files;
} catch (final IOException e) {
disconnect();
final FTPFile[] files = listFilesInDirectory(relPath);
return files;
}
}
private FTPFile[] listFilesInDirectory(final String relPath) throws IOException {
FTPFile[] files;
// VFS-307: no check if we can simply list the files, this might fail if there are spaces in the path
files = getFtpClient().listFiles(relPath);
if (FTPReply.isPositiveCompletion(getFtpClient().getReplyCode())) {
return files;
}
// VFS-307: now try the hard way by cd'ing into the directory, list and cd back
// if VFS is required to fallback here the user might experience a real bad FTP performance
// as then every list requires 4 ftp commands.
String workingDirectory = null;
if (relPath != null) {
workingDirectory = getFtpClient().printWorkingDirectory();
if (!getFtpClient().changeWorkingDirectory(relPath)) {
return null;
}
}
files = getFtpClient().listFiles();
if (relPath != null && !getFtpClient().changeWorkingDirectory(workingDirectory)) {
throw new FileSystemException("vfs.provider.ftp.wrapper/change-work-directory-back.error",
workingDirectory);
}
return files;
}
@Override
public boolean removeDirectory(final String relPath) throws IOException {
try {
return getFtpClient().removeDirectory(relPath);
} catch (final IOException e) {
disconnect();
return getFtpClient().removeDirectory(relPath);
}
}
@Override
public boolean deleteFile(final String relPath) throws IOException {
try {
return getFtpClient().deleteFile(relPath);
} catch (final IOException e) {
disconnect();
return getFtpClient().deleteFile(relPath);
}
}
@Override
public boolean rename(final String oldName, final String newName) throws IOException {
try {
return getFtpClient().rename(oldName, newName);
} catch (final IOException e) {
disconnect();
return getFtpClient().rename(oldName, newName);
}
}
@Override
public boolean makeDirectory(final String relPath) throws IOException {
try {
return getFtpClient().makeDirectory(relPath);
} catch (final IOException e) {
disconnect();
return getFtpClient().makeDirectory(relPath);
}
}
@Override
public boolean completePendingCommand() throws IOException {
if (ftpClient != null) {
return getFtpClient().completePendingCommand();
}
return true;
}
@Override
public InputStream retrieveFileStream(final String relPath) throws IOException {
try {
return getFtpClient().retrieveFileStream(relPath);
} catch (final IOException e) {
disconnect();
return getFtpClient().retrieveFileStream(relPath);
}
}
@Override
public InputStream retrieveFileStream(final String relPath, final long restartOffset) throws IOException {
try {
final FTPClient client = getFtpClient();
client.setRestartOffset(restartOffset);
return client.retrieveFileStream(relPath);
} catch (final IOException e) {
disconnect();
final FTPClient client = getFtpClient();
client.setRestartOffset(restartOffset);
return client.retrieveFileStream(relPath);
}
}
@Override
public OutputStream appendFileStream(final String relPath) throws IOException {
try {
return getFtpClient().appendFileStream(relPath);
} catch (final IOException e) {
disconnect();
return getFtpClient().appendFileStream(relPath);
}
}
@Override
public OutputStream storeFileStream(final String relPath) throws IOException {
try {
return getFtpClient().storeFileStream(relPath);
} catch (final IOException e) {
disconnect();
return getFtpClient().storeFileStream(relPath);
}
}
@Override
public boolean abort() throws IOException {
try {
// [email protected]: 2005-02-14
// it should be better to really "abort" the transfer, but
// currently I didnt manage to make it work - so lets "abort" the hard way.
// return getFtpClient().abort();
disconnect();
return true;
} catch (final IOException e) {
disconnect();
}
return true;
}
@Override
public int getReplyCode() throws IOException {
return getFtpClient().getReplyCode();
}
@Override
public String getReplyString() throws IOException {
return getFtpClient().getReplyString();
}
}