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// ========================================================================
// Copyright 2011-2012 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.websocket.client.internal.io;
import java.io.IOException;
import java.net.URI;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.ScheduledExecutorService;
import org.eclipse.jetty.io.AbstractConnection;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.FutureCallback;
import org.eclipse.jetty.util.QuotedStringTokenizer;
import org.eclipse.jetty.util.StringUtil;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.websocket.api.UpgradeException;
import org.eclipse.jetty.websocket.api.UpgradeResponse;
import org.eclipse.jetty.websocket.client.internal.ClientUpgradeRequest;
import org.eclipse.jetty.websocket.client.internal.IWebSocketClient;
import org.eclipse.jetty.websocket.protocol.AcceptHash;
import org.eclipse.jetty.websocket.protocol.ExtensionConfig;
/**
* This is the initial connection handling that exists immediately after physical connection is established to destination server.
* <p>
* Eventually, upon successful Upgrade request/response, this connection swaps itself out for the WebSocektClientConnection handler.
*/
public class UpgradeConnection extends AbstractConnection
{
public class SendUpgradeRequest extends FutureCallback<String> implements Runnable
{
@Override
public void completed(String context)
{
// Writing the request header is complete.
super.completed(context);
// start the interest in fill
fillInterested();
}
@Override
public void run()
{
URI uri = client.getWebSocketUri();
String rawRequest = request.generate(uri);
ByteBuffer buf = BufferUtil.toBuffer(rawRequest,StringUtil.__UTF8_CHARSET);
getEndPoint().write("REQ",this,buf);
}
}
private static final Logger LOG = Log.getLogger(UpgradeConnection.class);
private final ByteBufferPool bufferPool;
private final ScheduledExecutorService scheduler;
private final IWebSocketClient client;
private final HttpResponseHeaderParser parser;
private ClientUpgradeRequest request;
public UpgradeConnection(EndPoint endp, Executor executor, IWebSocketClient client)
{
super(endp,executor);
this.client = client;
this.bufferPool = client.getFactory().getBufferPool();
this.scheduler = client.getFactory().getScheduler();
this.parser = new HttpResponseHeaderParser();
try
{
this.request = (ClientUpgradeRequest)client.getUpgradeRequest();
}
catch (ClassCastException e)
{
client.failed(null,new RuntimeException("Invalid Upgrade Request structure",e));
}
}
public void disconnect(boolean onlyOutput)
{
EndPoint endPoint = getEndPoint();
// We need to gently close first, to allow
// SSL close alerts to be sent by Jetty
LOG.debug("Shutting down output {}",endPoint);
endPoint.shutdownOutput();
if (!onlyOutput)
{
LOG.debug("Closing {}",endPoint);
endPoint.close();
}
}
private void notifyConnect()
{
client.completed(client.getUpgradeResponse());
}
@Override
public void onFillable()
{
int bufSize = client.getPolicy().getBufferSize();
ByteBuffer buffer = bufferPool.acquire(bufSize,false);
BufferUtil.clear(buffer);
boolean readMore = false;
try
{
readMore = read(buffer);
}
finally
{
bufferPool.release(buffer);
}
if (readMore)
{
fillInterested();
}
}
@Override
public void onOpen()
{
super.onOpen();
// TODO: handle timeout
getExecutor().execute(new SendUpgradeRequest());
}
/**
* Read / Parse the waiting read/fill buffer
*
* @param buffer
* the buffer to fill into from the endpoint
* @return true if there is more to read, false if reading should stop
*/
private boolean read(ByteBuffer buffer)
{
EndPoint endPoint = getEndPoint();
try
{
while (true)
{
int filled = endPoint.fill(buffer);
if (filled == 0)
{
return true;
}
else if (filled < 0)
{
LOG.debug("read - EOF Reached");
return false;
}
else
{
if (LOG.isDebugEnabled())
{
LOG.debug("Filled {} bytes - {}",filled,BufferUtil.toDetailString(buffer));
}
UpgradeResponse resp = parser.parse(buffer);
if (resp != null)
{
// Got a response!
client.setUpgradeResponse(resp);
validateResponse(resp);
notifyConnect();
upgradeConnection();
return false; // do no more reading
}
}
}
}
catch (IOException e)
{
LOG.warn(e);
client.failed(null,e);
disconnect(false);
return false;
}
catch (UpgradeException e)
{
LOG.warn(e);
client.failed(null,e);
disconnect(false);
return false;
}
}
private void upgradeConnection()
{
EndPoint endp = getEndPoint();
Executor executor = getExecutor();
WebSocketClientConnection conn = new WebSocketClientConnection(endp,executor,client);
endp.setConnection(conn);
}
private void validateResponse(UpgradeResponse response)
{
// Check the Accept hash
String reqKey = request.getKey();
String expectedHash = AcceptHash.hashKey(reqKey);
response.validateWebSocketHash(expectedHash);
// Parse extensions
List<ExtensionConfig> extensions = new ArrayList<>();
Iterator<String> extIter = response.getHeaderValues("Sec-WebSocket-Extensions");
while (extIter.hasNext())
{
String extVal = extIter.next();
QuotedStringTokenizer tok = new QuotedStringTokenizer(extVal,",");
while (tok.hasMoreTokens())
{
extensions.add(ExtensionConfig.parse(tok.nextToken()));
}
}
response.setExtensions(extensions);
}
}
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