org.eclipse.jetty.server.HttpChannel Maven / Gradle / Ivy
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//
// ========================================================================
// Copyright (c) 1995-2012 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.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import javax.servlet.DispatcherType;
import javax.servlet.RequestDispatcher;
import org.eclipse.jetty.http.HttpFields;
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.HttpURI;
import org.eclipse.jetty.http.HttpVersion;
import org.eclipse.jetty.http.MimeTypes;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.io.EofException;
import org.eclipse.jetty.server.handler.ErrorHandler;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.URIUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.thread.Scheduler;
/* ------------------------------------------------------------ */
/** HttpChannel.
* Represents a single endpoint for HTTP semantic processing.
* The HttpChannel is both a HttpParser.RequestHandler, where it passively receives events from
* an incoming HTTP request, and a Runnable, where it actively takes control of the request/response
* life cycle and calls the application (perhaps suspending and resuming with multiple calls to run).
* The HttpChannel signals the switch from passive mode to active mode by returning true to one of the
* HttpParser.RequestHandler callbacks. The completion of the active phase is signalled by a call to
* HttpTransport.completed().
*
*/
public class HttpChannel implements HttpParser.RequestHandler, Runnable
{
private static final Logger LOG = Log.getLogger(HttpChannel.class);
private static final ThreadLocal> __currentChannel = new ThreadLocal<>();
public static HttpChannel getCurrentHttpChannel()
{
return __currentChannel.get();
}
protected static void setCurrentHttpChannel(HttpChannel channel)
{
__currentChannel.set(channel);
}
private final AtomicBoolean _committed = new AtomicBoolean();
private final AtomicInteger _requests = new AtomicInteger();
private final Connector _connector;
private final HttpConfiguration _configuration;
private final EndPoint _endPoint;
private final HttpTransport _transport;
private final HttpURI _uri;
private final HttpChannelState _state;
private final Request _request;
private final Response _response;
private HttpVersion _version = HttpVersion.HTTP_1_1;
private boolean _expect = false;
private boolean _expect100Continue = false;
private boolean _expect102Processing = false;
public HttpChannel(Connector connector, HttpConfiguration configuration, EndPoint endPoint, HttpTransport transport, HttpInput input)
{
_connector = connector;
_configuration = configuration;
_endPoint = endPoint;
_transport = transport;
_uri = new HttpURI(URIUtil.__CHARSET);
_state = new HttpChannelState(this);
_request = new Request(this, input);
_response = new Response(this, new HttpOutput(this));
}
public HttpChannelState getState()
{
return _state;
}
public HttpVersion getHttpVersion()
{
return _version;
}
/**
* @return the number of requests handled by this connection
*/
public int getRequests()
{
return _requests.get();
}
public Connector getConnector()
{
return _connector;
}
public ByteBufferPool getByteBufferPool()
{
return _connector.getByteBufferPool();
}
public HttpConfiguration getHttpConfiguration()
{
return _configuration;
}
public Server getServer()
{
return _connector.getServer();
}
public Request getRequest()
{
return _request;
}
public Response getResponse()
{
return _response;
}
public EndPoint getEndPoint()
{
return _endPoint;
}
public InetSocketAddress getLocalAddress()
{
return _endPoint.getLocalAddress();
}
public InetSocketAddress getRemoteAddress()
{
return _endPoint.getRemoteAddress();
}
/**
* If the associated response has the Expect header set to 100 Continue,
* then accessing the input stream indicates that the handler/servlet
* is ready for the request body and thus a 100 Continue response is sent.
*
* @throws IOException if the InputStream cannot be created
*/
public void continue100(int available) throws IOException
{
// If the client is expecting 100 CONTINUE, then send it now.
// TODO: consider using an AtomicBoolean ?
if (isExpecting100Continue())
{
_expect100Continue = false;
// is content missing?
if (available == 0)
{
if (_response.isCommitted())
throw new IOException("Committed before 100 Continues");
// TODO: break this dependency with HttpGenerator
boolean committed = commitResponse(HttpGenerator.CONTINUE_100_INFO, null, false);
if (!committed)
throw new IOException("Concurrent commit while trying to send 100-Continue"); // TODO: better message
}
}
}
public void reset()
{
_committed.set(false);
_expect = false;
_expect100Continue = false;
_expect102Processing = false;
_request.recycle();
_response.recycle();
_uri.clear();
}
@Override
public void run()
{
LOG.debug("{} handle enter", this);
setCurrentHttpChannel(this);
String threadName = null;
if (LOG.isDebugEnabled())
{
threadName = Thread.currentThread().getName();
Thread.currentThread().setName(threadName + " - " + _uri);
}
try
{
// Loop here to handle async request redispatches.
// The loop is controlled by the call to async.unhandle in the
// finally block below. Unhandle will return false only if an async dispatch has
// already happened when unhandle is called.
boolean handling = _state.handling();
while (handling && getServer().isRunning())
{
try
{
_request.setHandled(false);
_response.getHttpOutput().reopen();
if (_state.isInitial())
{
_request.setTimeStamp(System.currentTimeMillis());
_request.setDispatcherType(DispatcherType.REQUEST);
for (HttpConfiguration.Customizer customizer : _configuration.getCustomizers())
customizer.customize(getConnector(),_configuration,_request);
getServer().handle(this);
}
else
{
_request.setDispatcherType(DispatcherType.ASYNC);
getServer().handleAsync(this);
}
}
catch (Error e)
{
if ("ContinuationThrowable".equals(e.getClass().getSimpleName()))
LOG.ignore(e);
else
throw e;
}
catch (Exception e)
{
if (e instanceof EofException)
LOG.debug(e);
else
LOG.warn(String.valueOf(_uri), e);
_state.error(e);
_request.setHandled(true);
handleException(e);
}
finally
{
handling = !_state.unhandle();
}
}
}
finally
{
if (threadName != null && LOG.isDebugEnabled())
Thread.currentThread().setName(threadName);
setCurrentHttpChannel(null);
if (_state.isCompleting())
{
try
{
_state.completed();
if (!_response.isCommitted() && !_request.isHandled())
_response.sendError(404);
// Complete generating the response
_response.complete();
}
catch(EofException e)
{
LOG.debug(e);
}
catch(Exception e)
{
LOG.warn(e);
}
finally
{
_request.setHandled(true);
_transport.completed();
}
}
LOG.debug("{} handle exit", this);
}
}
/**
* Sends an error 500, performing a special logic to detect whether the request is suspended,
* to avoid concurrent writes from the application.
* It may happen that the application suspends, and then throws an exception, while an application
* spawned thread writes the response content; in such case, we attempt to commit the error directly
* bypassing the {@link ErrorHandler} mechanisms and the response OutputStream.
*
* @param x the Throwable that caused the problem
*/
protected void handleException(Throwable x)
{
try
{
if (_state.isSuspended())
{
HttpFields fields = new HttpFields();
ResponseInfo info = new ResponseInfo(_request.getHttpVersion(), fields, 0, HttpStatus.INTERNAL_SERVER_ERROR_500, null, _request.isHead());
boolean committed = commitResponse(info, null, true);
if (!committed)
LOG.warn("Could not send response error 500: "+x);
}
else if (isCommitted())
{
if (!(x instanceof EofException))
LOG.warn("Could not send response error 500: "+x);
}
else
{
_request.setAttribute(RequestDispatcher.ERROR_EXCEPTION,x);
_request.setAttribute(RequestDispatcher.ERROR_EXCEPTION_TYPE,x.getClass());
_response.sendError(500, x.getMessage());
}
}
catch (IOException e)
{
// We tried our best, just log
LOG.debug("Could not commit response error 500", e);
}
}
public boolean isExpecting100Continue()
{
return _expect100Continue;
}
public boolean isExpecting102Processing()
{
return _expect102Processing;
}
@Override
public String toString()
{
return String.format("%s@%x{r=%s,a=%s}",
getClass().getSimpleName(),
hashCode(),
_requests,
_state.getState());
}
@Override
public boolean startRequest(HttpMethod httpMethod, String method, String uri, HttpVersion version)
{
_expect = false;
_expect100Continue = false;
_expect102Processing = false;
if (_request.getTimeStamp() == 0)
_request.setTimeStamp(System.currentTimeMillis());
_request.setMethod(httpMethod, method);
if (httpMethod == HttpMethod.CONNECT)
_uri.parseConnect(uri);
else
_uri.parse(uri);
_request.setUri(_uri);
String path;
try
{
path = _uri.getDecodedPath();
}
catch (Exception e)
{
LOG.warn("Failed UTF-8 decode for request path, trying ISO-8859-1");
LOG.ignore(e);
path = _uri.getDecodedPath(StringUtil.__ISO_8859_1);
}
String info = URIUtil.canonicalPath(path);
if (info == null)
info = "/";
_request.setPathInfo(info);
_version = version == null ? HttpVersion.HTTP_0_9 : version;
_request.setHttpVersion(_version);
return false;
}
@Override
public boolean parsedHeader(HttpHeader header, String name, String value)
{
if (value == null)
value = "";
if (header != null)
{
switch (header)
{
case EXPECT:
if (_version.getVersion()>=HttpVersion.HTTP_1_1.getVersion())
{
HttpHeaderValue expect = HttpHeaderValue.CACHE.get(value);
switch (expect == null ? HttpHeaderValue.UNKNOWN : expect)
{
case CONTINUE:
_expect100Continue = true;
break;
case PROCESSING:
_expect102Processing = true;
break;
default:
String[] values = value.split(",");
for (int i = 0; values != null && i < values.length; i++)
{
expect = HttpHeaderValue.CACHE.get(values[i].trim());
if (expect == null)
_expect = true;
else
{
switch (expect)
{
case CONTINUE:
_expect100Continue = true;
break;
case PROCESSING:
_expect102Processing = true;
break;
default:
_expect = true;
}
}
}
}
}
break;
case CONTENT_TYPE:
MimeTypes.Type mime = MimeTypes.CACHE.get(value);
String charset = (mime == null || mime.getCharset() == null) ? MimeTypes.getCharsetFromContentType(value) : mime.getCharset().toString();
if (charset != null)
_request.setCharacterEncodingUnchecked(charset);
break;
}
}
if (name != null)
_request.getHttpFields().add(name, value);
return false;
}
@Override
public boolean parsedHostHeader(String host, int port)
{
_request.setServerName(host);
_request.setServerPort(port);
return false;
}
@Override
public boolean headerComplete()
{
_requests.incrementAndGet();
switch (_version)
{
case HTTP_0_9:
break;
case HTTP_1_0:
if (getServer().getSendDateHeader())
_response.getHttpFields().putDateField(HttpHeader.DATE.toString(), _request.getTimeStamp());
break;
case HTTP_1_1:
if (getServer().getSendDateHeader())
_response.getHttpFields().putDateField(HttpHeader.DATE.toString(), _request.getTimeStamp());
if (_expect)
{
badMessage(HttpStatus.EXPECTATION_FAILED_417,null);
return true;
}
break;
default:
throw new IllegalStateException();
}
// Either handle now or wait for first content/message complete
return _expect100Continue;
}
@Override
public boolean content(T item)
{
if (LOG.isDebugEnabled())
LOG.debug("{} content {}", this, item);
@SuppressWarnings("unchecked")
HttpInput input = (HttpInput)_request.getHttpInput();
input.content(item);
return true;
}
@Override
public boolean messageComplete()
{
_request.getHttpInput().shutdown();
return true;
}
@Override
public boolean earlyEOF()
{
_request.getHttpInput().earlyEOF();
return false;
}
@Override
public void badMessage(int status, String reason)
{
if (status < 400 || status > 599)
status = HttpStatus.BAD_REQUEST_400;
try
{
if (_state.handling())
{
commitResponse(new ResponseInfo(HttpVersion.HTTP_1_1,new HttpFields(),0,status,reason,false),null,true);
_state.unhandle();
}
}
catch (IOException e)
{
LOG.warn(e);
}
finally
{
_state.completed();
}
}
protected boolean commitResponse(ResponseInfo info, ByteBuffer content, boolean complete) throws IOException
{
boolean committed = _committed.compareAndSet(false, true);
if (committed)
{
try
{
// Try to commit with the passed info
_transport.send(info, content, complete);
// If we are committing a 1xx response, we need to reset the commit
// status so that the "real" response can be committed again.
if (info.getStatus() < 200)
_committed.set(false);
}
catch (EofException e)
{
LOG.debug(e);
// TODO is it worthwhile sending if we are at EoF?
// "application" info failed to commit, commit with a failsafe 500 info
_transport.send(HttpGenerator.RESPONSE_500_INFO,null,true);
complete=true;
throw e;
}
catch (Exception e)
{
LOG.warn(e);
// "application" info failed to commit, commit with a failsafe 500 info
_transport.send(HttpGenerator.RESPONSE_500_INFO,null,true);
complete=true;
throw e;
}
finally
{
// TODO this indicates the relationship with HttpOutput is not exactly correct
if (complete)
_response.getHttpOutput().closed();
}
}
return committed;
}
protected boolean isCommitted()
{
return _committed.get();
}
/**
* Requests to write (in a blocking way) the given response content buffer,
* committing the response if needed.
*
* @param content the content buffer to write
* @param complete whether the content is complete for the response
* @throws IOException if the write fails
*/
protected void write(ByteBuffer content, boolean complete) throws IOException
{
if (isCommitted())
{
_transport.send(null, content, complete);
}
else
{
ResponseInfo info = _response.newResponseInfo();
boolean committed = commitResponse(info, content, complete);
if (!committed)
throw new IOException("Concurrent commit"); // TODO: better message
}
}
protected void execute(Runnable task)
{
_connector.getExecutor().execute(task);
}
public Scheduler getScheduler()
{
return _connector.getScheduler();
}
}