| /** |
| * 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.hadoop.fs.sftp; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.apache.hadoop.fs.FSInputStream; |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.util.StringUtils; |
| |
| import com.jcraft.jsch.ChannelSftp; |
| import com.jcraft.jsch.JSchException; |
| import com.jcraft.jsch.Session; |
| |
| /** SFTP FileSystem input stream. */ |
| class SFTPInputStream extends FSInputStream { |
| |
| public static final String E_SEEK_NOTSUPPORTED = "Seek not supported"; |
| public static final String E_CLIENT_NULL = |
| "SFTP client null or not connected"; |
| public static final String E_NULL_INPUTSTREAM = "Null InputStream"; |
| public static final String E_STREAM_CLOSED = "Stream closed"; |
| public static final String E_CLIENT_NOTCONNECTED = "Client not connected"; |
| |
| private InputStream wrappedStream; |
| private ChannelSftp channel; |
| private FileSystem.Statistics stats; |
| private boolean closed; |
| private long pos; |
| |
| SFTPInputStream(InputStream stream, ChannelSftp channel, |
| FileSystem.Statistics stats) { |
| |
| if (stream == null) { |
| throw new IllegalArgumentException(E_NULL_INPUTSTREAM); |
| } |
| if (channel == null || !channel.isConnected()) { |
| throw new IllegalArgumentException(E_CLIENT_NULL); |
| } |
| this.wrappedStream = stream; |
| this.channel = channel; |
| this.stats = stats; |
| |
| this.pos = 0; |
| this.closed = false; |
| } |
| |
| @Override |
| public void seek(long position) throws IOException { |
| throw new IOException(E_SEEK_NOTSUPPORTED); |
| } |
| |
| @Override |
| public boolean seekToNewSource(long targetPos) throws IOException { |
| throw new IOException(E_SEEK_NOTSUPPORTED); |
| } |
| |
| @Override |
| public long getPos() throws IOException { |
| return pos; |
| } |
| |
| @Override |
| public synchronized int read() throws IOException { |
| if (closed) { |
| throw new IOException(E_STREAM_CLOSED); |
| } |
| |
| int byteRead = wrappedStream.read(); |
| if (byteRead >= 0) { |
| pos++; |
| } |
| if (stats != null & byteRead >= 0) { |
| stats.incrementBytesRead(1); |
| } |
| return byteRead; |
| } |
| |
| public synchronized int read(byte[] buf, int off, int len) |
| throws IOException { |
| if (closed) { |
| throw new IOException(E_STREAM_CLOSED); |
| } |
| |
| int result = wrappedStream.read(buf, off, len); |
| if (result > 0) { |
| pos += result; |
| } |
| if (stats != null & result > 0) { |
| stats.incrementBytesRead(result); |
| } |
| |
| return result; |
| } |
| |
| public synchronized void close() throws IOException { |
| if (closed) { |
| return; |
| } |
| super.close(); |
| closed = true; |
| if (!channel.isConnected()) { |
| throw new IOException(E_CLIENT_NOTCONNECTED); |
| } |
| |
| try { |
| Session session = channel.getSession(); |
| channel.disconnect(); |
| session.disconnect(); |
| } catch (JSchException e) { |
| throw new IOException(StringUtils.stringifyException(e)); |
| } |
| } |
| } |