//
// ========================================================================
// Copyright (c) 1995-2013 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.server;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.ClosedChannelException;
import java.util.concurrent.RejectedExecutionException;
import javax.servlet.ReadListener;
import org.eclipse.jetty.http.HttpGenerator;
import org.eclipse.jetty.http.HttpGenerator.ResponseInfo;
import org.eclipse.jetty.http.HttpHeader;
import org.eclipse.jetty.http.HttpHeaderValue;
import org.eclipse.jetty.http.HttpMethod;
import org.eclipse.jetty.http.HttpParser;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.http.HttpVersion;
import org.eclipse.jetty.io.AbstractConnection;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.io.Connection;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.io.EofException;
import org.eclipse.jetty.util.BlockingCallback;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.IteratingNestedCallback;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* <p>A {@link Connection} that handles the HTTP protocol.</p>
*/
public class HttpConnection extends AbstractConnection implements Runnable, HttpTransport
{
public static final String UPGRADE_CONNECTION_ATTRIBUTE = "org.eclipse.jetty.server.HttpConnection.UPGRADE";
private static final boolean REQUEST_BUFFER_DIRECT=false;
private static final boolean HEADER_BUFFER_DIRECT=false;
private static final boolean CHUNK_BUFFER_DIRECT=false;
private static final Logger LOG = Log.getLogger(HttpConnection.class);
private static final ThreadLocal<HttpConnection> __currentConnection = new ThreadLocal<>();
private final HttpConfiguration _config;
private final Connector _connector;
private final ByteBufferPool _bufferPool;
private final HttpGenerator _generator;
private final HttpChannelOverHttp _channel;
private final HttpParser _parser;
private volatile ByteBuffer _requestBuffer = null;
private volatile ByteBuffer _chunk = null;
private BlockingCallback _writeBlocker = new BlockingCallback();
public static HttpConnection getCurrentConnection()
{
return __currentConnection.get();
}
protected static void setCurrentConnection(HttpConnection connection)
{
__currentConnection.set(connection);
}
public HttpConfiguration getHttpConfiguration()
{
return _config;
}
public HttpConnection(HttpConfiguration config, Connector connector, EndPoint endPoint)
{
// Tell AbstractConnector executeOnFillable==true because we want the same thread that
// does the HTTP parsing to handle the request so its cache is hot
super(endPoint, connector.getExecutor(),true);
_config = config;
_connector = connector;
_bufferPool = _connector.getByteBufferPool();
_generator = new HttpGenerator(_config.getSendServerVersion(),_config.getSendXPoweredBy());
_channel = new HttpChannelOverHttp(connector, config, endPoint, this, new HttpInputOverHTTP(this));
_parser = newHttpParser();
LOG.debug("New HTTP Connection {}", this);
}
protected HttpParser newHttpParser()
{
return new HttpParser(newRequestHandler(), getHttpConfiguration().getRequestHeaderSize());
}
protected HttpParser.RequestHandler<ByteBuffer> newRequestHandler()
{
return _channel;
}
public Server getServer()
{
return _connector.getServer();
}
public Connector getConnector()
{
return _connector;
}
public HttpChannel<?> getHttpChannel()
{
return _channel;
}
public HttpParser getParser()
{
return _parser;
}
public void reset()
{
// If we are still expecting
if (_channel.isExpecting100Continue())
// close to seek EOF
_parser.close();
_channel.reset();
if (_generator.isPersistent() && !_parser.isClosed())
// reset to seek next request
_parser.reset();
else
// else seek EOF
_parser.close();
_generator.reset();
releaseRequestBuffer();
if (_chunk!=null)
{
_bufferPool.release(_chunk);
_chunk=null;
}
}
@Override
public int getMessagesIn()
{
return getHttpChannel().getRequests();
}
@Override
public int getMessagesOut()
{
return getHttpChannel().getRequests();
}
void releaseRequestBuffer()
{
if (_requestBuffer != null && !_requestBuffer.hasRemaining())
{
ByteBuffer buffer=_requestBuffer;
_requestBuffer=null;
_bufferPool.release(buffer);
}
}
public ByteBuffer getRequestBuffer()
{
if (_requestBuffer == null)
_requestBuffer = _bufferPool.acquire(getInputBufferSize(), REQUEST_BUFFER_DIRECT);
return _requestBuffer;
}
/**
* <p>Parses and handles HTTP messages.</p>
* <p>This method is called when this {@link Connection} is ready to read bytes from the {@link EndPoint}.
* However, it can also be called if there is unconsumed data in the _requestBuffer, as a result of
* resuming a suspended request when there is a pipelined request already read into the buffer.</p>
* <p>This method fills bytes and parses them until either: EOF is filled; 0 bytes are filled;
* the HttpChannel finishes handling; or the connection has changed.</p>
*/
@Override
public void onFillable()
{
LOG.debug("{} onFillable {}", this, _channel.getState());
setCurrentConnection(this);
int filled=Integer.MAX_VALUE;
boolean suspended=false;
try
{
// while not suspended and not upgraded
while (!suspended && getEndPoint().getConnection()==this)
{
// Do we need some data to parse
if (BufferUtil.isEmpty(_requestBuffer))
{
// If the previous iteration filled 0 bytes or saw a close, then break here
if (filled<=0)
break;
// Can we fill?
if(getEndPoint().isInputShutdown())
{
// No pretend we read -1
filled=-1;
_parser.atEOF();
}
else
{
// Get a buffer
if (_requestBuffer == null)
_requestBuffer = _bufferPool.acquire(getInputBufferSize(), REQUEST_BUFFER_DIRECT);
// fill
filled = getEndPoint().fill(_requestBuffer);
if (filled==0) // Do a retry on fill 0 (optimization for SSL connections)
filled = getEndPoint().fill(_requestBuffer);
// tell parser
if (filled < 0)
_parser.atEOF();
}
}
// Parse the buffer
if (_parser.parseNext(_requestBuffer==null?BufferUtil.EMPTY_BUFFER:_requestBuffer))
{
// The parser returned true, which indicates the channel is ready to handle a request.
// Call the channel and this will either handle the request/response to completion OR,
// if the request suspends, the request/response will be incomplete so the outer loop will exit.
suspended = !_channel.handle();
}
}
}
catch (EofException e)
{
LOG.debug(e);
}
catch (Exception e)
{
if (_parser.isIdle())
LOG.debug(e);
else
LOG.warn(this.toString(), e);
close();
}
finally
{
setCurrentConnection(null);
if (!suspended && getEndPoint().isOpen())
{
fillInterested();
}
}
}
@Override
protected void onFillInterestedFailed(Throwable cause)
{
_parser.close();
super.onFillInterestedFailed(cause);
}
@Override
public void onOpen()
{
super.onOpen();
fillInterested();
}
@Override
public void run()
{
onFillable();
}
@Override
public void send(HttpGenerator.ResponseInfo info, ByteBuffer content, boolean lastContent) throws IOException
{
try
{
if (info==null)
new ContentCallback(content,lastContent,_writeBlocker).iterate();
else
{
// If we are still expecting a 100 continues
if (_channel.isExpecting100Continue())
// then we can't be persistent
_generator.setPersistent(false);
new CommitCallback(info,content,lastContent,_writeBlocker).iterate();
}
_writeBlocker.block();
}
catch (ClosedChannelException e)
{
throw new EofException(e);
}
catch (IOException e)
{
throw e;
}
}
@Override
public void send(ResponseInfo info, ByteBuffer content, boolean lastContent, Callback callback)
{
if (info==null)
new ContentCallback(content,lastContent,callback).iterate();
else
{
// If we are still expecting a 100 continues
if (_channel.isExpecting100Continue())
// then we can't be persistent
_generator.setPersistent(false);
new CommitCallback(info,content,lastContent,callback).iterate();
}
}
@Override
public void send(ByteBuffer content, boolean lastContent, Callback callback)
{
new ContentCallback(content,lastContent,callback).iterate();
}
@Override
public void completed()
{
// Finish consuming the request
if (_parser.inContentState() && _generator.isPersistent() && !_channel.isExpecting100Continue())
// Complete reading the request
_channel.getRequest().getHttpInput().consumeAll();
// Handle connection upgrades
if (_channel.getResponse().getStatus() == HttpStatus.SWITCHING_PROTOCOLS_101)
{
Connection connection = (Connection)_channel.getRequest().getAttribute(UPGRADE_CONNECTION_ATTRIBUTE);
if (connection != null)
{
LOG.debug("Upgrade from {} to {}", this, connection);
onClose();
getEndPoint().setConnection(connection);
connection.onOpen();
reset();
return;
}
}
reset();
// if we are not called from the onfillable thread, schedule completion
if (getCurrentConnection()!=this)
{
if (_parser.isStart())
{
// TODO ???
// it wants to eat more
if (_requestBuffer == null)
{
fillInterested();
}
else if (getConnector().isStarted())
{
LOG.debug("{} pipelined", this);
try
{
getExecutor().execute(this);
}
catch (RejectedExecutionException e)
{
if (getConnector().isStarted())
LOG.warn(e);
else
LOG.ignore(e);
getEndPoint().close();
}
}
else
{
getEndPoint().close();
}
}
}
}
private class HttpChannelOverHttp extends HttpChannel<ByteBuffer>
{
public HttpChannelOverHttp(Connector connector, HttpConfiguration config, EndPoint endPoint, HttpTransport transport, HttpInput<ByteBuffer> input)
{
super(connector,config,endPoint,transport,input);
}
@Override
public boolean content(ByteBuffer item)
{
super.content(item);
return true;
}
@Override
public void badMessage(int status, String reason)
{
_generator.setPersistent(false);
super.badMessage(status,reason);
}
@Override
public boolean headerComplete()
{
boolean persistent;
HttpVersion version = getHttpVersion();
switch (version)
{
case HTTP_0_9:
{
persistent = false;
break;
}
case HTTP_1_0:
{
persistent = getRequest().getHttpFields().contains(HttpHeader.CONNECTION, HttpHeaderValue.KEEP_ALIVE.asString());
if (!persistent)
persistent = HttpMethod.CONNECT.is(getRequest().getMethod());
if (persistent)
getResponse().getHttpFields().add(HttpHeader.CONNECTION, HttpHeaderValue.KEEP_ALIVE);
break;
}
case HTTP_1_1:
{
persistent = !getRequest().getHttpFields().contains(HttpHeader.CONNECTION, HttpHeaderValue.CLOSE.asString());
if (!persistent)
persistent = HttpMethod.CONNECT.is(getRequest().getMethod());
if (!persistent)
getResponse().getHttpFields().add(HttpHeader.CONNECTION, HttpHeaderValue.CLOSE);
break;
}
default:
{
throw new IllegalStateException();
}
}
if (!persistent)
_generator.setPersistent(false);
return super.headerComplete();
}
@Override
protected void handleException(Throwable x)
{
_generator.setPersistent(false);
super.handleException(x);
}
@Override
public void failed()
{
getEndPoint().shutdownOutput();
}
}
private class CommitCallback extends IteratingNestedCallback
{
final ByteBuffer _content;
final boolean _lastContent;
final ResponseInfo _info;
ByteBuffer _header;
CommitCallback(ResponseInfo info, ByteBuffer content, boolean last, Callback callback)
{
super(callback);
_info=info;
_content=content;
_lastContent=last;
}
@Override
public boolean process() throws Exception
{
ByteBuffer chunk = _chunk;
while (true)
{
HttpGenerator.Result result = _generator.generateResponse(_info, _header, chunk, _content, _lastContent);
if (LOG.isDebugEnabled())
LOG.debug("{} generate: {} ({},{},{})@{}",
this,
result,
BufferUtil.toSummaryString(_header),
BufferUtil.toSummaryString(_content),
_lastContent,
_generator.getState());
switch (result)
{
case NEED_HEADER:
{
if (_lastContent && _content!=null && BufferUtil.space(_content)>_config.getResponseHeaderSize() && _content.hasArray() )
{
// use spare space in content buffer for header buffer
int p=_content.position();
int l=_content.limit();
_content.position(l);
_content.limit(l+_config.getResponseHeaderSize());
_header=_content.slice();
_header.limit(0);
_content.position(p);
_content.limit(l);
}
else
_header = _bufferPool.acquire(_config.getResponseHeaderSize(), HEADER_BUFFER_DIRECT);
continue;
}
case NEED_CHUNK:
{
chunk = _chunk = _bufferPool.acquire(HttpGenerator.CHUNK_SIZE, CHUNK_BUFFER_DIRECT);
continue;
}
case FLUSH:
{
// Don't write the chunk or the content if this is a HEAD response
if (_channel.getRequest().isHead())
{
BufferUtil.clear(chunk);
BufferUtil.clear(_content);
}
// If we have a header
if (BufferUtil.hasContent(_header))
{
if (BufferUtil.hasContent(_content))
{
if (BufferUtil.hasContent(chunk))
getEndPoint().write(this, _header, chunk, _content);
else
getEndPoint().write(this, _header, _content);
}
else
getEndPoint().write(this, _header);
}
else if (BufferUtil.hasContent(chunk))
{
if (BufferUtil.hasContent(_content))
getEndPoint().write(this, chunk, _content);
else
getEndPoint().write(this, chunk);
}
else if (BufferUtil.hasContent(_content))
{
getEndPoint().write(this, _content);
}
else
continue;
return false;
}
case SHUTDOWN_OUT:
{
getEndPoint().shutdownOutput();
continue;
}
case DONE:
{
if (_header!=null)
{
// don't release header in spare content buffer
if (!_lastContent || _content==null || !_content.hasArray() || !_header.hasArray() || _content.array()!=_header.array())
_bufferPool.release(_header);
}
return true;
}
case CONTINUE:
{
break;
}
default:
{
throw new IllegalStateException("generateResponse="+result);
}
}
}
}
}
private class ContentCallback extends IteratingNestedCallback
{
final ByteBuffer _content;
final boolean _lastContent;
ContentCallback(ByteBuffer content, boolean last, Callback callback)
{
super(callback);
_content=content;
_lastContent=last;
}
@Override
public boolean process() throws Exception
{
ByteBuffer chunk = _chunk;
while (true)
{
HttpGenerator.Result result = _generator.generateResponse(null, null, chunk, _content, _lastContent);
if (LOG.isDebugEnabled())
LOG.debug("{} generate: {} ({},{})@{}",
this,
result,
BufferUtil.toSummaryString(_content),
_lastContent,
_generator.getState());
switch (result)
{
case NEED_HEADER:
throw new IllegalStateException();
case NEED_CHUNK:
{
chunk = _chunk = _bufferPool.acquire(HttpGenerator.CHUNK_SIZE, CHUNK_BUFFER_DIRECT);
continue;
}
case FLUSH:
{
// Don't write the chunk or the content if this is a HEAD response
if (_channel.getRequest().isHead())
{
BufferUtil.clear(chunk);
BufferUtil.clear(_content);
continue;
}
else if (BufferUtil.hasContent(chunk))
{
if (BufferUtil.hasContent(_content))
getEndPoint().write(this, chunk, _content);
else
getEndPoint().write(this, chunk);
}
else if (BufferUtil.hasContent(_content))
{
getEndPoint().write(this, _content);
}
else
continue;
return false;
}
case SHUTDOWN_OUT:
{
getEndPoint().shutdownOutput();
continue;
}
case DONE:
{
return true;
}
case CONTINUE:
{
break;
}
default:
{
throw new IllegalStateException("generateResponse="+result);
}
}
}
}
}
}
