org.eclipse.jetty.spdy.generator.SynStreamGenerator Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// 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.eclipse.jetty.spdy.generator;
import java.nio.ByteBuffer;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.spdy.SessionException;
import org.eclipse.jetty.spdy.StreamException;
import org.eclipse.jetty.spdy.api.SPDY;
import org.eclipse.jetty.spdy.api.SessionStatus;
import org.eclipse.jetty.spdy.api.StreamStatus;
import org.eclipse.jetty.spdy.frames.ControlFrame;
import org.eclipse.jetty.spdy.frames.SynStreamFrame;
import org.eclipse.jetty.util.BufferUtil;
public class SynStreamGenerator extends ControlFrameGenerator
{
private final HeadersBlockGenerator headersBlockGenerator;
public SynStreamGenerator(ByteBufferPool bufferPool, HeadersBlockGenerator headersBlockGenerator)
{
super(bufferPool);
this.headersBlockGenerator = headersBlockGenerator;
}
@Override
public ByteBuffer generate(ControlFrame frame)
{
SynStreamFrame synStream = (SynStreamFrame)frame;
short version = synStream.getVersion();
ByteBuffer headersBuffer = headersBlockGenerator.generate(version, synStream.getHeaders());
int frameBodyLength = 10;
int frameLength = frameBodyLength + headersBuffer.remaining();
if (frameLength > 0xFF_FF_FF)
{
// Too many headers, but unfortunately we have already modified the compression
// context, so we have no other choice than tear down the connection.
throw new SessionException(SessionStatus.PROTOCOL_ERROR, "Too many headers");
}
int totalLength = ControlFrame.HEADER_LENGTH + frameLength;
ByteBuffer buffer = getByteBufferPool().acquire(totalLength, Generator.useDirectBuffers);
BufferUtil.clearToFill(buffer);
generateControlFrameHeader(synStream, frameLength, buffer);
int streamId = synStream.getStreamId();
buffer.putInt(streamId & 0x7F_FF_FF_FF);
buffer.putInt(synStream.getAssociatedStreamId() & 0x7F_FF_FF_FF);
writePriority(streamId, version, synStream.getPriority(), buffer);
buffer.put((byte)synStream.getSlot());
buffer.put(headersBuffer);
buffer.flip();
return buffer;
}
private void writePriority(int streamId, short version, byte priority, ByteBuffer buffer)
{
switch (version)
{
case SPDY.V2:
priority <<= 6;
break;
case SPDY.V3:
priority <<= 5;
break;
default:
throw new StreamException(streamId, StreamStatus.UNSUPPORTED_VERSION);
}
buffer.put(priority);
}
}