/*
* 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.common.channel;
import java.io.IOException;
import org.apache.sshd.common.Channel;
import org.apache.sshd.common.Closeable;
import org.apache.sshd.common.RuntimeSshException;
import org.apache.sshd.common.SshException;
import org.apache.sshd.common.future.CloseFuture;
import org.apache.sshd.common.future.DefaultCloseFuture;
import org.apache.sshd.common.future.DefaultSshFuture;
import org.apache.sshd.common.future.SshFuture;
import org.apache.sshd.common.future.SshFutureListener;
import org.apache.sshd.common.io.IoInputStream;
import org.apache.sshd.common.io.IoReadFuture;
import org.apache.sshd.common.io.ReadPendingException;
import org.apache.sshd.common.util.Buffer;
import org.apache.sshd.common.util.CloseableUtils;
import org.apache.sshd.common.util.Readable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ChannelAsyncInputStream extends CloseableUtils.AbstractInnerCloseable implements IoInputStream {
private final Channel channel;
private final Buffer buffer = new Buffer();
private IoReadFutureImpl pending;
public ChannelAsyncInputStream(Channel channel) {
this.channel = channel;
}
public void write(Readable src) throws IOException {
synchronized (buffer) {
buffer.putBuffer(src);
}
doRead(true);
}
public IoReadFuture read(Buffer buf) {
IoReadFutureImpl future = new IoReadFutureImpl(buf);
if (isClosing()) {
future.setValue(new IOException("Closed"));
} else {
synchronized (buffer) {
if (pending != null) {
throw new ReadPendingException();
}
pending = future;
}
doRead(false);
}
return future;
}
@Override
protected Closeable getInnerCloseable() {
synchronized (buffer) {
if (buffer.available() == 0) {
if (pending != null) {
pending.setValue(new SshException("Closed"));
}
}
return builder()
.when(pending)
.build();
}
}
private void doRead(boolean resume) {
IoReadFutureImpl future = null;
int nbRead = 0;
synchronized (buffer) {
if (buffer.available() > 0) {
if (resume) {
// LOGGER.debug("Resuming read due to incoming data");
}
future = pending;
pending = null;
if (future != null) {
nbRead = future.buffer.putBuffer(buffer, false);
buffer.compact();
}
} else {
if (!resume) {
// LOGGER.debug("Delaying read until data is available");
}
}
}
if (nbRead > 0) {
try {
channel.getLocalWindow().consumeAndCheck(nbRead);
} catch (IOException e) {
channel.getSession().exceptionCaught(e);
}
future.setValue(nbRead);
}
}
@Override
public String toString() {
return "ChannelAsyncInputStream[" + channel + "]";
}
public static class IoReadFutureImpl extends DefaultSshFuture<IoReadFuture> implements IoReadFuture {
final Buffer buffer;
public IoReadFutureImpl(Buffer buffer) {
super(null);
this.buffer = buffer;
}
public Buffer getBuffer() {
return buffer;
}
public void verify() throws SshException {
try {
await();
}
catch (InterruptedException e) {
throw new SshException("Interrupted", e);
}
if (getValue() instanceof Throwable) {
throw new SshException("Write failed", getException());
}
}
public int getRead() {
Object v = getValue();
if (v instanceof RuntimeException) {
throw (RuntimeException) v;
} else if (v instanceof Error) {
throw (Error) v;
} else if (v instanceof Throwable) {
throw (RuntimeSshException) new RuntimeSshException("Error reading from channel.").initCause((Throwable) v);
} else if (v instanceof Integer) {
return (Integer) v;
} else {
throw new IllegalStateException();
}
}
public Throwable getException() {
Object v = getValue();
if (v instanceof Throwable) {
return (Throwable) v;
} else {
return null;
}
}
}
}