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//
// ========================================================================
// Copyright (c) 1995-2021 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.apache.hbase.thirdparty.org.eclipse.jetty.server.handler.gzip;
import java.nio.ByteBuffer;
import java.nio.channels.WritePendingException;
import java.util.concurrent.atomic.AtomicReference;
import java.util.zip.CRC32;
import java.util.zip.Deflater;
import org.apache.hbase.thirdparty.org.eclipse.jetty.http.HttpField;
import org.apache.hbase.thirdparty.org.eclipse.jetty.http.HttpFields;
import org.apache.hbase.thirdparty.org.eclipse.jetty.http.HttpHeader;
import org.apache.hbase.thirdparty.org.eclipse.jetty.http.HttpStatus;
import org.apache.hbase.thirdparty.org.eclipse.jetty.http.MimeTypes;
import org.apache.hbase.thirdparty.org.eclipse.jetty.http.PreEncodedHttpField;
import org.apache.hbase.thirdparty.org.eclipse.jetty.server.HttpChannel;
import org.apache.hbase.thirdparty.org.eclipse.jetty.server.HttpOutput;
import org.apache.hbase.thirdparty.org.eclipse.jetty.server.Response;
import org.apache.hbase.thirdparty.org.eclipse.jetty.util.BufferUtil;
import org.apache.hbase.thirdparty.org.eclipse.jetty.util.Callback;
import org.apache.hbase.thirdparty.org.eclipse.jetty.util.IteratingNestedCallback;
import org.apache.hbase.thirdparty.org.eclipse.jetty.util.StringUtil;
import org.apache.hbase.thirdparty.org.eclipse.jetty.util.log.Log;
import org.apache.hbase.thirdparty.org.eclipse.jetty.util.log.Logger;
import static org.apache.hbase.thirdparty.org.eclipse.jetty.http.CompressedContentFormat.GZIP;
public class GzipHttpOutputInterceptor implements HttpOutput.Interceptor
{
public static Logger LOG = Log.getLogger(GzipHttpOutputInterceptor.class);
private static final byte[] GZIP_HEADER = new byte[]{(byte)0x1f, (byte)0x8b, Deflater.DEFLATED, 0, 0, 0, 0, 0, 0, 0};
public static final HttpField VARY_ACCEPT_ENCODING_USER_AGENT = new PreEncodedHttpField(HttpHeader.VARY, HttpHeader.ACCEPT_ENCODING + ", " + HttpHeader.USER_AGENT);
public static final HttpField VARY_ACCEPT_ENCODING = new PreEncodedHttpField(HttpHeader.VARY, HttpHeader.ACCEPT_ENCODING.asString());
private enum GZState
{
MIGHT_COMPRESS, NOT_COMPRESSING, COMMITTING, COMPRESSING, FINISHED
}
private final AtomicReference _state = new AtomicReference<>(GZState.MIGHT_COMPRESS);
private final CRC32 _crc = new CRC32();
private final GzipFactory _factory;
private final HttpOutput.Interceptor _interceptor;
private final HttpChannel _channel;
private final HttpField _vary;
private final int _bufferSize;
private final boolean _syncFlush;
private Deflater _deflater;
private ByteBuffer _buffer;
public GzipHttpOutputInterceptor(GzipFactory factory, HttpChannel channel, HttpOutput.Interceptor next, boolean syncFlush)
{
this(factory, VARY_ACCEPT_ENCODING_USER_AGENT, channel.getHttpConfiguration().getOutputBufferSize(), channel, next, syncFlush);
}
public GzipHttpOutputInterceptor(GzipFactory factory, HttpField vary, HttpChannel channel, HttpOutput.Interceptor next, boolean syncFlush)
{
this(factory, vary, channel.getHttpConfiguration().getOutputBufferSize(), channel, next, syncFlush);
}
public GzipHttpOutputInterceptor(GzipFactory factory, HttpField vary, int bufferSize, HttpChannel channel, HttpOutput.Interceptor next, boolean syncFlush)
{
_factory = factory;
_channel = channel;
_interceptor = next;
_vary = vary;
_bufferSize = bufferSize;
_syncFlush = syncFlush;
}
@Override
public HttpOutput.Interceptor getNextInterceptor()
{
return _interceptor;
}
@Override
public boolean isOptimizedForDirectBuffers()
{
return false; // No point as deflator is in user space.
}
@Override
public void write(ByteBuffer content, boolean complete, Callback callback)
{
switch (_state.get())
{
case MIGHT_COMPRESS:
commit(content, complete, callback);
break;
case NOT_COMPRESSING:
_interceptor.write(content, complete, callback);
return;
case COMMITTING:
callback.failed(new WritePendingException());
break;
case COMPRESSING:
gzip(content, complete, callback);
break;
default:
callback.failed(new IllegalStateException("state=" + _state.get()));
break;
}
}
private void addTrailer()
{
BufferUtil.putIntLittleEndian(_buffer, (int)_crc.getValue());
BufferUtil.putIntLittleEndian(_buffer, _deflater.getTotalIn());
}
private void gzip(ByteBuffer content, boolean complete, final Callback callback)
{
if (content.hasRemaining() || complete)
new GzipBufferCB(content, complete, callback).iterate();
else
callback.succeeded();
}
protected void commit(ByteBuffer content, boolean complete, Callback callback)
{
// Are we excluding because of status?
Response response = _channel.getResponse();
int sc = response.getStatus();
if (sc > 0 && (sc < 200 || sc == 204 || sc == 205 || sc >= 300))
{
LOG.debug("{} exclude by status {}", this, sc);
noCompression();
if (sc == HttpStatus.NOT_MODIFIED_304)
{
String requestEtags = (String)_channel.getRequest().getAttribute(GzipHandler.GZIP_HANDLER_ETAGS);
String responseEtag = response.getHttpFields().get(HttpHeader.ETAG);
if (requestEtags != null && responseEtag != null)
{
String responseEtagGzip = etagGzip(responseEtag);
if (requestEtags.contains(responseEtagGzip))
response.getHttpFields().put(HttpHeader.ETAG, responseEtagGzip);
}
}
_interceptor.write(content, complete, callback);
return;
}
// Are we excluding because of mime-type?
String ct = response.getContentType();
if (ct != null)
{
ct = MimeTypes.getContentTypeWithoutCharset(ct);
if (!_factory.isMimeTypeGzipable(StringUtil.asciiToLowerCase(ct)))
{
LOG.debug("{} exclude by mimeType {}", this, ct);
noCompression();
_interceptor.write(content, complete, callback);
return;
}
}
// Has the Content-Encoding header already been set?
HttpFields fields = response.getHttpFields();
String ce = fields.get(HttpHeader.CONTENT_ENCODING);
if (ce != null)
{
LOG.debug("{} exclude by content-encoding {}", this, ce);
noCompression();
_interceptor.write(content, complete, callback);
return;
}
// Are we the thread that commits?
if (_state.compareAndSet(GZState.MIGHT_COMPRESS, GZState.COMMITTING))
{
// We are varying the response due to accept encoding header.
if (_vary != null)
{
if (fields.contains(HttpHeader.VARY))
fields.addCSV(HttpHeader.VARY, _vary.getValues());
else
fields.add(_vary);
}
long contentLength = response.getContentLength();
if (contentLength < 0 && complete)
contentLength = content.remaining();
_deflater = _factory.getDeflater(_channel.getRequest(), contentLength);
if (_deflater == null)
{
LOG.debug("{} exclude no deflater", this);
_state.set(GZState.NOT_COMPRESSING);
_interceptor.write(content, complete, callback);
return;
}
fields.put(GZIP.getContentEncoding());
_crc.reset();
// Adjust headers
response.setContentLength(-1);
String etag = fields.get(HttpHeader.ETAG);
if (etag != null)
fields.put(HttpHeader.ETAG, etagGzip(etag));
LOG.debug("{} compressing {}", this, _deflater);
_state.set(GZState.COMPRESSING);
if (BufferUtil.isEmpty(content))
{
// We are committing, but have no content to compress, so flush empty buffer to write headers.
_interceptor.write(BufferUtil.EMPTY_BUFFER, complete, callback);
}
else
{
gzip(content, complete, callback);
}
}
else
callback.failed(new WritePendingException());
}
private String etagGzip(String etag)
{
return GZIP.etag(etag);
}
public void noCompression()
{
while (true)
{
switch (_state.get())
{
case NOT_COMPRESSING:
return;
case MIGHT_COMPRESS:
if (_state.compareAndSet(GZState.MIGHT_COMPRESS, GZState.NOT_COMPRESSING))
return;
break;
default:
throw new IllegalStateException(_state.get().toString());
}
}
}
public void noCompressionIfPossible()
{
while (true)
{
switch (_state.get())
{
case COMPRESSING:
case NOT_COMPRESSING:
return;
case MIGHT_COMPRESS:
if (_state.compareAndSet(GZState.MIGHT_COMPRESS, GZState.NOT_COMPRESSING))
return;
break;
default:
throw new IllegalStateException(_state.get().toString());
}
}
}
public boolean mightCompress()
{
return _state.get() == GZState.MIGHT_COMPRESS;
}
private class GzipBufferCB extends IteratingNestedCallback
{
private ByteBuffer _copy;
private final ByteBuffer _content;
private final boolean _last;
public GzipBufferCB(ByteBuffer content, boolean complete, Callback callback)
{
super(callback);
_content = content;
_last = complete;
}
@Override
protected void onCompleteFailure(Throwable x)
{
_factory.recycle(_deflater);
_deflater = null;
super.onCompleteFailure(x);
}
@Override
protected Action process() throws Exception
{
// If we have no deflator
if (_deflater == null)
{
// then the trailer has been generated and written below.
// we have finished compressing the entire content, so
// cleanup and succeed.
if (_buffer != null)
{
_channel.getByteBufferPool().release(_buffer);
_buffer = null;
}
if (_copy != null)
{
_channel.getByteBufferPool().release(_copy);
_copy = null;
}
return Action.SUCCEEDED;
}
// If we have no buffer
if (_buffer == null)
{
// allocate a buffer and add the gzip header
_buffer = _channel.getByteBufferPool().acquire(_bufferSize, false);
BufferUtil.fill(_buffer, GZIP_HEADER, 0, GZIP_HEADER.length);
}
else
{
// otherwise clear the buffer as previous writes will always fully consume.
BufferUtil.clear(_buffer);
}
// If the deflator is not finished, then compress more data
if (!_deflater.finished())
{
if (_deflater.needsInput())
{
// if there is no more content available to compress
// then we are either finished all content or just the current write.
if (BufferUtil.isEmpty(_content))
{
if (_last)
_deflater.finish();
else
return Action.SUCCEEDED;
}
else
{
// If there is more content available to compress, we have to make sure
// it is available in an array for the current deflator API, maybe slicing
// of content.
ByteBuffer slice;
if (_content.hasArray())
slice = _content;
else
{
if (_copy == null)
_copy = _channel.getByteBufferPool().acquire(_bufferSize, false);
else
BufferUtil.clear(_copy);
slice = _copy;
BufferUtil.append(_copy, _content);
}
// transfer the data from the slice to the the deflator
byte[] array = slice.array();
int off = slice.arrayOffset() + slice.position();
int len = slice.remaining();
_crc.update(array, off, len);
_deflater.setInput(array, off, len); // TODO use ByteBuffer API in Jetty-10
slice.position(slice.position() + len);
if (_last && BufferUtil.isEmpty(_content))
_deflater.finish();
}
}
// deflate the content into the available space in the buffer
int off = _buffer.arrayOffset() + _buffer.limit();
int len = BufferUtil.space(_buffer);
int produced = _deflater.deflate(_buffer.array(), off, len, _syncFlush ? Deflater.SYNC_FLUSH : Deflater.NO_FLUSH);
_buffer.limit(_buffer.limit() + produced);
}
// If we have finished deflation and there is room for the trailer.
if (_deflater.finished() && BufferUtil.space(_buffer) >= 8)
{
// add the trailer and recycle the deflator to flag that we will have had completeSuccess when
// the write below completes.
addTrailer();
_factory.recycle(_deflater);
_deflater = null;
}
// write the compressed buffer.
_interceptor.write(_buffer, _deflater == null, this);
return Action.SCHEDULED;
}
@Override
public String toString()
{
return String.format("%s[content=%s last=%b copy=%s buffer=%s deflate=%s %s]",
super.toString(),
BufferUtil.toDetailString(_content),
_last,
BufferUtil.toDetailString(_copy),
BufferUtil.toDetailString(_buffer),
_deflater,
_deflater != null && _deflater.finished() ? "(finished)" : "");
}
}
}
