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// ========================================================================
// Copyright (c) 2010 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.websocket;
import java.io.IOException;
import org.eclipse.jetty.io.Buffer;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.io.EofException;
/* ------------------------------------------------------------ */
/** WebSocketGenerator.
* This class generates websocket packets.
* It is fully synchronized because it is likely that async
* threads will call the addMessage methods while other
* threads are flushing the generator.
*/
public class WebSocketGeneratorD13 implements WebSocketGenerator
{
final private WebSocketBuffers _buffers;
final private EndPoint _endp;
private Buffer _buffer;
private final byte[] _mask=new byte[4];
private int _m;
private boolean _opsent;
private final MaskGen _maskGen;
private boolean _closed;
public WebSocketGeneratorD13(WebSocketBuffers buffers, EndPoint endp)
{
_buffers=buffers;
_endp=endp;
_maskGen=null;
}
public WebSocketGeneratorD13(WebSocketBuffers buffers, EndPoint endp, MaskGen maskGen)
{
_buffers=buffers;
_endp=endp;
_maskGen=maskGen;
}
public synchronized Buffer getBuffer()
{
return _buffer;
}
public synchronized void addFrame(byte flags, byte opcode, byte[] content, int offset, int length) throws IOException
{
// System.err.printf("<< %s %s %s\n",TypeUtil.toHexString(flags),TypeUtil.toHexString(opcode),length);
if (_closed)
throw new EofException("Closed");
if (opcode==WebSocketConnectionD13.OP_CLOSE)
_closed=true;
boolean mask=_maskGen!=null;
if (_buffer==null)
_buffer=mask?_buffers.getBuffer():_buffers.getDirectBuffer();
boolean last=WebSocketConnectionD13.isLastFrame(flags);
int space=mask?14:10;
do
{
opcode = _opsent?WebSocketConnectionD13.OP_CONTINUATION:opcode;
opcode=(byte)(((0xf&flags)<<4)+(0xf&opcode));
_opsent=true;
int payload=length;
if (payload+space>_buffer.capacity())
{
// We must fragement, so clear FIN bit
opcode=(byte)(opcode&0x7F); // Clear the FIN bit
payload=_buffer.capacity()-space;
}
else if (last)
opcode= (byte)(opcode|0x80); // Set the FIN bit
// ensure there is space for header
if (_buffer.space() <= space)
{
flushBuffer();
if (_buffer.space() <= space)
flush();
}
// write the opcode and length
if (payload>0xffff)
{
_buffer.put(new byte[]{
opcode,
mask?(byte)0xff:(byte)0x7f,
(byte)0,
(byte)0,
(byte)0,
(byte)0,
(byte)((payload>>24)&0xff),
(byte)((payload>>16)&0xff),
(byte)((payload>>8)&0xff),
(byte)(payload&0xff)});
}
else if (payload >=0x7e)
{
_buffer.put(new byte[]{
opcode,
mask?(byte)0xfe:(byte)0x7e,
(byte)(payload>>8),
(byte)(payload&0xff)});
}
else
{
_buffer.put(new byte[]{
opcode,
(byte)(mask?(0x80|payload):payload)});
}
// write mask
if (mask)
{
_maskGen.genMask(_mask);
_m=0;
_buffer.put(_mask);
}
// write payload
int remaining = payload;
while (remaining > 0)
{
_buffer.compact();
int chunk = remaining < _buffer.space() ? remaining : _buffer.space();
if (mask)
{
for (int i=0;i<chunk;i++)
_buffer.put((byte)(content[offset+ (payload-remaining)+i]^_mask[+_m++%4]));
}
else
_buffer.put(content, offset + (payload - remaining), chunk);
remaining -= chunk;
if (_buffer.space() > 0)
{
// Gently flush the data, issuing a non-blocking write
flushBuffer();
}
else
{
// Forcibly flush the data, issuing a blocking write
flush();
if (remaining == 0)
{
// Gently flush the data, issuing a non-blocking write
flushBuffer();
}
}
}
offset+=payload;
length-=payload;
}
while (length>0);
_opsent=!last;
if (_buffer!=null && _buffer.length()==0)
{
_buffers.returnBuffer(_buffer);
_buffer=null;
}
}
public synchronized int flushBuffer() throws IOException
{
if (!_endp.isOpen())
throw new EofException();
if (_buffer!=null)
{
int flushed=_buffer.hasContent()?_endp.flush(_buffer):0;
if (_closed&&_buffer.length()==0)
_endp.shutdownOutput();
return flushed;
}
return 0;
}
public synchronized int flush() throws IOException
{
if (_buffer==null)
return 0;
int result = flushBuffer();
if (!_endp.isBlocking())
{
long now = System.currentTimeMillis();
long end=now+_endp.getMaxIdleTime();
while (_buffer.length()>0)
{
boolean ready = _endp.blockWritable(end-now);
if (!ready)
{
now = System.currentTimeMillis();
if (now<end)
continue;
throw new IOException("Write timeout");
}
result += flushBuffer();
}
}
_buffer.compact();
return result;
}
public synchronized boolean isBufferEmpty()
{
return _buffer==null || _buffer.length()==0;
}
public synchronized void returnBuffer()
{
if (_buffer!=null && _buffer.length()==0)
{
_buffers.returnBuffer(_buffer);
_buffer=null;
}
}
}
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