/*
* 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.sshd.client.channel;
import java.io.IOException;
import java.io.InputStream;
import org.apache.sshd.client.future.OpenFuture;
import org.apache.sshd.common.SshConstants;
import org.apache.sshd.common.channel.ChannelOutputStream;
import org.apache.sshd.common.channel.ChannelPipedInputStream;
import org.apache.sshd.common.channel.ChannelPipedOutputStream;
import org.apache.sshd.common.future.CloseFuture;
import org.apache.sshd.common.util.Buffer;
/**
* TODO Add javadoc
*
* @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a>
*/
public class ChannelSession extends AbstractClientChannel {
private Thread streamPumper;
public ChannelSession() {
super("session");
}
public OpenFuture open() throws IOException {
return internalOpen();
}
@Override
protected void doOpen() throws IOException {
invertedIn = new ChannelOutputStream(this, remoteWindow, log, SshConstants.Message.SSH_MSG_CHANNEL_DATA);
if (out == null) {
ChannelPipedInputStream pis = new ChannelPipedInputStream(localWindow);
ChannelPipedOutputStream pos = new ChannelPipedOutputStream(pis);
out = pos;
invertedOut = pis;
}
if (err == null) {
ChannelPipedInputStream pis = new ChannelPipedInputStream(localWindow);
ChannelPipedOutputStream pos = new ChannelPipedOutputStream(pis);
err = pos;
invertedErr = pis;
}
if (in != null) {
streamPumper = new Thread("ClientInputStreamPump") {
@Override
public void run() {
pumpInputStream();
}
};
// Interrupt does not really work and the thread will only exit when
// the call to read() will return. So ensure this thread is a daemon
// to avoid blocking the whole app
streamPumper.setDaemon(true);
streamPumper.start();
}
}
@Override
protected void postClose() {
if (streamPumper != null) {
streamPumper.interrupt();
streamPumper = null;
}
super.postClose();
}
protected void pumpInputStream() {
try {
byte[] buffer = new byte[remoteWindow.getPacketSize()];
while (!closeFuture.isClosed()) {
int len = securedRead(in, buffer, 0, buffer.length);
if (len > 0) {
invertedIn.write(buffer, 0, len);
invertedIn.flush();
} else {
sendEof();
break;
}
}
} catch (Exception e) {
if (!closing.get()) {
log.info("Caught exception", e);
close(false);
}
}
}
//
// On some platforms, a call to System.in.read(new byte[65536], 0,32768) always throws an IOException.
// So we need to protect against that and chunk the call into smaller calls.
// This problem was found on Windows, JDK 1.6.0_03-b05.
//
protected int securedRead(InputStream in, byte[] buf, int off, int len) throws IOException {
int n = 0;
for (;;) {
int nread = in.read(buf, off + n, Math.min(1024, len - n));
if (nread <= 0) {
return (n == 0) ? nread : n;
}
n += nread;
if (n >= len) {
return n;
}
// if not closed but no bytes available, return
if (in.available() <= 0) {
return n;
}
}
}
}