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/*
* Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com> and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.lfs.server.fs;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.AsyncContext;
import javax.servlet.ServletOutputStream;
import javax.servlet.WriteListener;
import javax.servlet.http.HttpServletResponse;
import org.apache.http.HttpStatus;
import org.eclipse.jgit.lfs.lib.AnyLongObjectId;
import org.eclipse.jgit.lfs.lib.Constants;
import org.eclipse.jgit.util.HttpSupport;
/**
* Handle asynchronous large object download.
*
* @since 4.7
*/
public class ObjectDownloadListener implements WriteListener {
private static Logger LOG = Logger
.getLogger(ObjectDownloadListener.class.getName());
private final AsyncContext context;
private final HttpServletResponse response;
private final ServletOutputStream out;
private final ReadableByteChannel in;
private final WritableByteChannel outChannel;
private ByteBuffer buffer = ByteBuffer.allocateDirect(8192);
/**
* <p>Constructor for ObjectDownloadListener.</p>
*
* @param repository
* the repository storing large objects
* @param context
* the servlet asynchronous context
* @param response
* the servlet response
* @param id
* id of the object to be downloaded
* @throws java.io.IOException
*/
public ObjectDownloadListener(FileLfsRepository repository,
AsyncContext context, HttpServletResponse response,
AnyLongObjectId id) throws IOException {
this.context = context;
this.response = response;
this.in = repository.getReadChannel(id);
this.out = response.getOutputStream();
this.outChannel = Channels.newChannel(out);
response.addHeader(HttpSupport.HDR_CONTENT_LENGTH,
String.valueOf(repository.getSize(id)));
response.setContentType(Constants.HDR_APPLICATION_OCTET_STREAM);
}
/**
* {@inheritDoc}
*
* Write file content
*/
@Override
public void onWritePossible() throws IOException {
while (out.isReady()) {
try {
buffer.clear();
if (in.read(buffer) < 0) {
buffer = null;
} else {
buffer.flip();
}
} catch (Throwable t) {
LOG.log(Level.SEVERE, t.getMessage(), t);
buffer = null;
} finally {
if (buffer != null) {
outChannel.write(buffer);
} else {
try {
in.close();
} catch (IOException e) {
LOG.log(Level.SEVERE, e.getMessage(), e);
}
try {
out.close();
} finally {
context.complete();
}
// This is need to avoid endless loop in recent Jetty versions.
// That's because out.isReady() is returning true for already
// closed streams and because out.close() doesn't throw any
// exception any more when trying to close already closed stream.
return;
}
}
}
}
/**
* {@inheritDoc}
*
* Handle errors
*/
@Override
public void onError(Throwable e) {
try {
FileLfsServlet.sendError(response,
HttpStatus.SC_INTERNAL_SERVER_ERROR, e.getMessage());
context.complete();
in.close();
} catch (IOException ex) {
LOG.log(Level.SEVERE, ex.getMessage(), ex);
}
}
}
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