Jetty example source code file (HttpGenerator.java)
The Jetty HttpGenerator.java source code//========================================================================
//$Id: HttpGenerator.java,v 1.7 2005/11/25 21:17:12 gregwilkins Exp $
//Copyright 2004-2005 Mort Bay Consulting Pty. Ltd.
//------------------------------------------------------------------------
//Licensed 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.mortbay.jetty;
import java.io.IOException;
import java.util.Iterator;
import org.mortbay.io.Buffer;
import org.mortbay.io.BufferUtil;
import org.mortbay.io.Buffers;
import org.mortbay.io.EndPoint;
import org.mortbay.io.Portable;
import org.mortbay.io.BufferCache.CachedBuffer;
import org.mortbay.log.Log;
/* ------------------------------------------------------------ */
/**
* HttpGenerator. Builds HTTP Messages.
*
* @author gregw
*
*/
public class HttpGenerator extends AbstractGenerator
{
// common _content
private static byte[] LAST_CHUNK =
{ (byte) '0', (byte) '\015', (byte) '\012', (byte) '\015', (byte) '\012'};
private static byte[] CONTENT_LENGTH_0 = Portable.getBytes("Content-Length: 0\015\012");
private static byte[] CONNECTION_KEEP_ALIVE = Portable.getBytes("Connection: keep-alive\015\012");
private static byte[] CONNECTION_CLOSE = Portable.getBytes("Connection: close\015\012");
private static byte[] CONNECTION_ = Portable.getBytes("Connection: ");
private static byte[] CRLF = Portable.getBytes("\015\012");
private static byte[] TRANSFER_ENCODING_CHUNKED = Portable.getBytes("Transfer-Encoding: chunked\015\012");
private static byte[] SERVER = Portable.getBytes("Server: Jetty(6.0.x)\015\012");
// other statics
private static int CHUNK_SPACE = 12;
public static void setServerVersion(String version)
{
SERVER=Portable.getBytes("Server: Jetty("+version+")\015\012");
}
// data
private boolean _bypass = false; // True if _content buffer can be written directly to endp and bypass the content buffer
private boolean _needCRLF = false;
private boolean _needEOC = false;
private boolean _bufferChunked = false;
/* ------------------------------------------------------------------------------- */
/**
* Constructor.
*
* @param buffers buffer pool
* @param headerBufferSize Size of the buffer to allocate for HTTP header
* @param contentBufferSize Size of the buffer to allocate for HTTP content
*/
public HttpGenerator(Buffers buffers, EndPoint io, int headerBufferSize, int contentBufferSize)
{
super(buffers,io,headerBufferSize,contentBufferSize);
}
/* ------------------------------------------------------------------------------- */
public void reset(boolean returnBuffers)
{
super.reset(returnBuffers);
_bypass = false;
_needCRLF = false;
_needEOC = false;
_bufferChunked=false;
_method=null;
_uri=null;
_noContent=false;
}
/* ------------------------------------------------------------ */
/**
* Add content.
*
* @param content
* @param last
* @throws IllegalArgumentException if <code>content is {@link Buffer#isImmutable immutable}.
* @throws IllegalStateException If the request is not expecting any more content,
* or if the buffers are full and cannot be flushed.
* @throws IOException if there is a problem flushing the buffers.
*/
public void addContent(Buffer content, boolean last) throws IOException
{
if (_noContent)
{
content.clear();
return;
}
if (_last || _state==STATE_END)
{
Log.debug("Ignoring extra content {}",content);
content.clear();
return;
}
_last = last;
// Handle any unfinished business?
if (_content!=null && _content.length()>0 || _bufferChunked)
{
if (!_endp.isOpen())
throw new EofException();
flush();
if (_content != null && _content.length()>0 || _bufferChunked)
throw new IllegalStateException("FULL");
}
_content = content;
_contentWritten += content.length();
// Handle the _content
if (_head)
{
content.clear();
_content=null;
}
else if (_endp != null && _buffer == null && content.length() > 0 && _last)
{
// TODO - use bypass in more cases.
// Make _content a direct buffer
_bypass = true;
}
else
{
// Yes - so we better check we have a buffer
if (_buffer == null)
_buffer = _buffers.getBuffer(_contentBufferSize);
// Copy _content to buffer;
int len=_buffer.put(_content);
_content.skip(len);
if (_content.length() == 0)
_content = null;
}
}
/* ------------------------------------------------------------ */
/**
* Add content.
*
* @param b byte
* @return true if the buffers are full
* @throws IOException
*/
public boolean addContent(byte b) throws IOException
{
if (_noContent)
return false;
if (_last || _state==STATE_END)
{
Log.debug("Ignoring extra content {}",new Byte(b));
return false;
}
// Handle any unfinished business?
if (_content != null && _content.length()>0 || _bufferChunked)
{
flush();
if (_content != null && _content.length()>0 || _bufferChunked)
throw new IllegalStateException("FULL");
}
_contentWritten++;
// Handle the _content
if (_head)
return false;
// we better check we have a buffer
if (_buffer == null)
_buffer = _buffers.getBuffer(_contentBufferSize);
// Copy _content to buffer;
_buffer.put(b);
return _buffer.space()<=(_contentLength == HttpTokens.CHUNKED_CONTENT?CHUNK_SPACE:0);
}
/* ------------------------------------------------------------ */
/** Prepare buffer for unchecked writes.
* Prepare the generator buffer to receive unchecked writes
* @return the available space in the buffer.
* @throws IOException
*/
protected int prepareUncheckedAddContent() throws IOException
{
if (_noContent)
return -1;
if (_last || _state==STATE_END)
return -1;
// Handle any unfinished business?
Buffer content = _content;
if (content != null && content.length()>0 || _bufferChunked)
{
flush();
if (content != null && content.length()>0 || _bufferChunked)
throw new IllegalStateException("FULL");
}
// we better check we have a buffer
if (_buffer == null)
_buffer = _buffers.getBuffer(_contentBufferSize);
_contentWritten-=_buffer.length();
// Handle the _content
if (_head)
return Integer.MAX_VALUE;
return _buffer.space()-(_contentLength == HttpTokens.CHUNKED_CONTENT?CHUNK_SPACE:0);
}
/* ------------------------------------------------------------ */
public boolean isBufferFull()
{
// Should we flush the buffers?
boolean full = super.isBufferFull() || _bufferChunked || _bypass || (_contentLength == HttpTokens.CHUNKED_CONTENT && _buffer != null && _buffer.space() < CHUNK_SPACE);
return full;
}
/* ------------------------------------------------------------ */
public void completeHeader(HttpFields fields, boolean allContentAdded) throws IOException
{
if (_state != STATE_HEADER)
return;
// handle a reset
if (_method==null && _status==0)
throw new EofException();
if (_last && !allContentAdded)
throw new IllegalStateException("last?");
_last = _last | allContentAdded;
// get a header buffer
if (_header == null)
_header = _buffers.getBuffer(_headerBufferSize);
boolean has_server = false;
if (_method!=null)
{
_close = false;
// Request
if (_version == HttpVersions.HTTP_0_9_ORDINAL)
{
_contentLength = HttpTokens.NO_CONTENT;
_header.put(_method);
_header.put((byte)' ');
_header.put(_uri.getBytes("utf-8")); // TODO WRONG!
_header.put(HttpTokens.CRLF);
_state = STATE_FLUSHING;
_noContent=true;
return;
}
else
{
_header.put(_method);
_header.put((byte)' ');
_header.put(_uri.getBytes("utf-8")); // TODO WRONG!
_header.put((byte)' ');
_header.put(_version==HttpVersions.HTTP_1_0_ORDINAL?HttpVersions.HTTP_1_0_BUFFER:HttpVersions.HTTP_1_1_BUFFER);
_header.put(HttpTokens.CRLF);
}
}
else
{
// Response
if (_version == HttpVersions.HTTP_0_9_ORDINAL)
{
_close = true;
_contentLength = HttpTokens.EOF_CONTENT;
_state = STATE_CONTENT;
return;
}
else
{
if (_version == HttpVersions.HTTP_1_0_ORDINAL)
_close = true;
// add response line
Buffer line = HttpStatus.getResponseLine(_status);
if (line==null)
{
if (_reason==null)
_reason=getReasonBuffer(_status);
_header.put(HttpVersions.HTTP_1_1_BUFFER);
_header.put((byte) ' ');
_header.put((byte) ('0' + _status / 100));
_header.put((byte) ('0' + (_status % 100) / 10));
_header.put((byte) ('0' + (_status % 10)));
_header.put((byte) ' ');
if (_reason==null)
{
_header.put((byte) ('0' + _status / 100));
_header.put((byte) ('0' + (_status % 100) / 10));
_header.put((byte) ('0' + (_status % 10)));
}
else
_header.put(_reason);
_header.put(HttpTokens.CRLF);
}
else
{
if (_reason==null)
_header.put(line);
else
{
_header.put(line.array(), 0, HttpVersions.HTTP_1_1_BUFFER.length() + 5);
_header.put(_reason);
_header.put(HttpTokens.CRLF);
}
}
if (_status<200 && _status>=100 )
{
_noContent=true;
_content=null;
if (_buffer!=null)
_buffer.clear();
// end the header.
_header.put(HttpTokens.CRLF);
_state = STATE_CONTENT;
return;
}
if (_status==204 || _status==304)
{
_noContent=true;
_content=null;
if (_buffer!=null)
_buffer.clear();
}
}
}
// Add headers
// key field values
HttpFields.Field content_length = null;
HttpFields.Field transfer_encoding = null;
boolean keep_alive = false;
boolean close=false;
StringBuffer connection = null;
if (fields != null)
{
Iterator iter = fields.getFields();
while (iter.hasNext())
{
HttpFields.Field field = (HttpFields.Field) iter.next();
switch (field.getNameOrdinal())
{
case HttpHeaders.CONTENT_LENGTH_ORDINAL:
content_length = field;
_contentLength = field.getLongValue();
if (_contentLength < _contentWritten || _last && _contentLength != _contentWritten)
content_length = null;
// write the field to the header buffer
field.put(_header);
break;
case HttpHeaders.CONTENT_TYPE_ORDINAL:
if (BufferUtil.isPrefix(MimeTypes.MULTIPART_BYTERANGES_BUFFER, field.getValueBuffer())) _contentLength = HttpTokens.SELF_DEFINING_CONTENT;
// write the field to the header buffer
field.put(_header);
break;
case HttpHeaders.TRANSFER_ENCODING_ORDINAL:
if (_version == HttpVersions.HTTP_1_1_ORDINAL) transfer_encoding = field;
// Do NOT add yet!
break;
case HttpHeaders.CONNECTION_ORDINAL:
int connection_value = field.getValueOrdinal();
switch (connection_value)
{
case -1:
{
String[] values = field.getValue().split(",");
for (int i=0;values!=null && i<values.length;i++)
{
CachedBuffer cb = HttpHeaderValues.CACHE.get(values[i].trim());
if (cb!=null)
{
switch(cb.getOrdinal())
{
case HttpHeaderValues.CLOSE_ORDINAL:
close=true;
if (_method==null)
_close=true;
keep_alive=false;
if (_close && _contentLength == HttpTokens.UNKNOWN_CONTENT)
_contentLength = HttpTokens.EOF_CONTENT;
break;
case HttpHeaderValues.KEEP_ALIVE_ORDINAL:
if (_version == HttpVersions.HTTP_1_0_ORDINAL)
{
keep_alive = true;
if (_method==null)
_close = false;
}
break;
default:
if (connection==null)
connection=new StringBuffer();
else
connection.append(',');
connection.append(values[i]);
}
}
else
{
if (connection==null)
connection=new StringBuffer();
else
connection.append(',');
connection.append(values[i]);
}
}
break;
}
case HttpHeaderValues.CLOSE_ORDINAL:
{
close=true;
if (_method==null)
_close=true;
if (_close && _contentLength == HttpTokens.UNKNOWN_CONTENT)
_contentLength = HttpTokens.EOF_CONTENT;
break;
}
case HttpHeaderValues.KEEP_ALIVE_ORDINAL:
{
if (_version == HttpVersions.HTTP_1_0_ORDINAL)
{
keep_alive = true;
if (_method==null)
_close = false;
}
break;
}
default:
{
if (connection==null)
connection=new StringBuffer();
else
connection.append(',');
connection.append(field.getValue());
}
}
// Do NOT add yet!
break;
case HttpHeaders.SERVER_ORDINAL:
if (getSendServerVersion())
{
has_server=true;
field.put(_header);
}
break;
default:
// write the field to the header buffer
field.put(_header);
}
}
}
// Calculate how to end _content and connection, _content length and transfer encoding
// settings.
// From RFC 2616 4.4:
// 1. No body for 1xx, 204, 304 & HEAD response
// 2. Force _content-length?
// 3. If Transfer-Encoding!=identity && HTTP/1.1 && !HttpConnection==close then chunk
// 4. Content-Length
// 5. multipart/byteranges
// 6. close
switch ((int) _contentLength)
{
case HttpTokens.UNKNOWN_CONTENT:
// It may be that we have no _content, or perhaps _content just has not been
// written yet?
// Response known not to have a body
if (_contentWritten == 0 && (_status < 200 || _status == 204 || _status == 304))
_contentLength = HttpTokens.NO_CONTENT;
else if (_last)
{
// we have seen all the _content there is
_contentLength = _contentWritten;
if (content_length == null)
{
// known length but not actually set.
_header.put(HttpHeaders.CONTENT_LENGTH_BUFFER);
_header.put(HttpTokens.COLON);
_header.put((byte) ' ');
BufferUtil.putDecLong(_header, _contentLength);
_header.put(HttpTokens.CRLF);
}
}
else
{
// No idea, so we must assume that a body is coming
_contentLength = (_close || _version < HttpVersions.HTTP_1_1_ORDINAL ) ? HttpTokens.EOF_CONTENT : HttpTokens.CHUNKED_CONTENT;
if (_method!=null && _contentLength==HttpTokens.EOF_CONTENT)
throw new IllegalStateException("No Content-Length");
}
break;
case HttpTokens.NO_CONTENT:
if (content_length == null && _status >= 200 && _status != 204 && _status != 304) _header.put(CONTENT_LENGTH_0);
break;
case HttpTokens.EOF_CONTENT:
_close = _method==null;
break;
case HttpTokens.CHUNKED_CONTENT:
break;
default:
// TODO - maybe allow forced chunking by setting te ???
break;
}
// Add transfer_encoding if needed
if (_contentLength == HttpTokens.CHUNKED_CONTENT)
{
// try to use user supplied encoding as it may have other values.
if (transfer_encoding != null && HttpHeaderValues.CHUNKED_ORDINAL != transfer_encoding.getValueOrdinal())
{
String c = transfer_encoding.getValue();
if (c.endsWith(HttpHeaderValues.CHUNKED))
transfer_encoding.put(_header);
else
throw new IllegalArgumentException("BAD TE");
}
else
_header.put(TRANSFER_ENCODING_CHUNKED);
}
// Handle connection if need be
if (_contentLength==HttpTokens.EOF_CONTENT)
{
keep_alive=false;
_close=true;
}
if (_close && (close || _version > HttpVersions.HTTP_1_0_ORDINAL))
{
_header.put(CONNECTION_CLOSE);
if (connection!=null)
{
_header.setPutIndex(_header.putIndex()-2);
_header.put((byte)',');
_header.put(connection.toString().getBytes());
_header.put(CRLF);
}
}
else if (keep_alive)
{
_header.put(CONNECTION_KEEP_ALIVE);
if (connection!=null)
{
_header.setPutIndex(_header.putIndex()-2);
_header.put((byte)',');
_header.put(connection.toString().getBytes());
_header.put(CRLF);
}
}
else if (connection!=null)
{
_header.put(CONNECTION_);
_header.put(connection.toString().getBytes());
_header.put(CRLF);
}
if (!has_server && _status>100 && getSendServerVersion())
_header.put(SERVER);
// end the header.
_header.put(HttpTokens.CRLF);
_state = STATE_CONTENT;
}
/* ------------------------------------------------------------ */
/**
* Complete the message.
*
* @throws IOException
*/
public void complete() throws IOException
{
if (_state == STATE_END)
return;
super.complete();
if (_state < STATE_FLUSHING)
{
_state = STATE_FLUSHING;
if (_contentLength == HttpTokens.CHUNKED_CONTENT)
_needEOC = true;
}
flush();
}
/* ------------------------------------------------------------ */
public long flush() throws IOException
{
try
{
if (_state == STATE_HEADER)
throw new IllegalStateException("State==HEADER");
prepareBuffers();
if (_endp == null)
{
if (_needCRLF && _buffer!=null)
_buffer.put(HttpTokens.CRLF);
if (_needEOC && _buffer!=null && !_head)
_buffer.put(LAST_CHUNK);
_needCRLF=false;
_needEOC=false;
return 0;
}
// Keep flushing while there is something to flush (except break below)
int total= 0;
long last_len = -1;
Flushing: while (true)
{
int len = -1;
int to_flush = ((_header != null && _header.length() > 0)?4:0) | ((_buffer != null && _buffer.length() > 0)?2:0) | ((_bypass && _content != null && _content.length() > 0)?1:0);
switch (to_flush)
{
case 7:
throw new IllegalStateException(); // should never happen!
case 6:
len = _endp.flush(_header, _buffer, null);
break;
case 5:
len = _endp.flush(_header, _content, null);
break;
case 4:
len = _endp.flush(_header);
break;
case 3:
throw new IllegalStateException(); // should never happen!
case 2:
len = _endp.flush(_buffer);
break;
case 1:
len = _endp.flush(_content);
break;
case 0:
{
// Nothing more we can write now.
if (_header != null)
_header.clear();
_bypass = false;
_bufferChunked = false;
if (_buffer != null)
{
_buffer.clear();
if (_contentLength == HttpTokens.CHUNKED_CONTENT)
{
// reserve some space for the chunk header
_buffer.setPutIndex(CHUNK_SPACE);
_buffer.setGetIndex(CHUNK_SPACE);
// Special case handling for small left over buffer from
// an addContent that caused a buffer flush.
if (_content != null && _content.length() < _buffer.space() && _state != STATE_FLUSHING)
{
_buffer.put(_content);
_content.clear();
_content = null;
break Flushing;
}
}
}
// Are we completely finished for now?
if (!_needCRLF && !_needEOC && (_content == null || _content.length() == 0))
{
if (_state == STATE_FLUSHING)
_state = STATE_END;
if (_state==STATE_END && _close && _status!=100)
_endp.close();
break Flushing;
}
// Try to prepare more to write.
prepareBuffers();
}
}
// If we failed to flush anything twice in a row break
if (len <= 0)
{
if (last_len <= 0)
break Flushing;
break;
}
last_len = len;
total+=len;
}
return total;
}
catch (IOException e)
{
Log.ignore(e);
throw (e instanceof EofException) ? e:new EofException(e);
}
}
/* ------------------------------------------------------------ */
private void prepareBuffers()
{
// if we are not flushing an existing chunk
if (!_bufferChunked)
{
// Refill buffer if possible
if (_content != null && _content.length() > 0 && _buffer != null && _buffer.space() > 0)
{
int len = _buffer.put(_content);
_content.skip(len);
if (_content.length() == 0)
_content = null;
}
// Chunk buffer if need be
if (_contentLength == HttpTokens.CHUNKED_CONTENT)
{
int size = _buffer == null ? 0 : _buffer.length();
if (size > 0)
{
// Prepare a chunk!
_bufferChunked = true;
// Did we leave space at the start of the buffer.
if (_buffer.getIndex() == CHUNK_SPACE)
{
// Oh yes, goodie! let's use it then!
_buffer.poke(_buffer.getIndex() - 2, HttpTokens.CRLF, 0, 2);
_buffer.setGetIndex(_buffer.getIndex() - 2);
BufferUtil.prependHexInt(_buffer, size);
if (_needCRLF)
{
_buffer.poke(_buffer.getIndex() - 2, HttpTokens.CRLF, 0, 2);
_buffer.setGetIndex(_buffer.getIndex() - 2);
_needCRLF = false;
}
}
else
{
// No space so lets use the header buffer.
if (_needCRLF)
{
if (_header.length() > 0) throw new IllegalStateException("EOC");
_header.put(HttpTokens.CRLF);
_needCRLF = false;
}
BufferUtil.putHexInt(_header, size);
_header.put(HttpTokens.CRLF);
}
// Add end chunk trailer.
if (_buffer.space() >= 2)
_buffer.put(HttpTokens.CRLF);
else
_needCRLF = true;
}
// If we need EOC and everything written
if (_needEOC && (_content == null || _content.length() == 0))
{
if (_needCRLF)
{
if (_buffer == null && _header.space() >= 2)
{
_header.put(HttpTokens.CRLF);
_needCRLF = false;
}
else if (_buffer!=null && _buffer.space() >= 2)
{
_buffer.put(HttpTokens.CRLF);
_needCRLF = false;
}
}
if (!_needCRLF && _needEOC)
{
if (_buffer == null && _header.space() >= LAST_CHUNK.length)
{
if (!_head)
{
_header.put(LAST_CHUNK);
_bufferChunked=true;
}
_needEOC = false;
}
else if (_buffer!=null && _buffer.space() >= LAST_CHUNK.length)
{
if (!_head)
{
_buffer.put(LAST_CHUNK);
_bufferChunked=true;
}
_needEOC = false;
}
}
}
}
}
if (_content != null && _content.length() == 0)
_content = null;
}
}
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