/
HTTP2ServerSession.java
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/
HTTP2ServerSession.java
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//
// ========================================================================
// Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
// ------------------------------------------------------------------------
// 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.http2.server;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import org.eclipse.jetty.http.MetaData;
import org.eclipse.jetty.http2.CloseState;
import org.eclipse.jetty.http2.ErrorCode;
import org.eclipse.jetty.http2.FlowControlStrategy;
import org.eclipse.jetty.http2.HTTP2Session;
import org.eclipse.jetty.http2.IStream;
import org.eclipse.jetty.http2.api.Session;
import org.eclipse.jetty.http2.api.Stream;
import org.eclipse.jetty.http2.api.server.ServerSessionListener;
import org.eclipse.jetty.http2.frames.Frame;
import org.eclipse.jetty.http2.frames.HeadersFrame;
import org.eclipse.jetty.http2.frames.PushPromiseFrame;
import org.eclipse.jetty.http2.frames.SettingsFrame;
import org.eclipse.jetty.http2.frames.WindowUpdateFrame;
import org.eclipse.jetty.http2.generator.Generator;
import org.eclipse.jetty.http2.parser.ServerParser;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.thread.Scheduler;
public class HTTP2ServerSession extends HTTP2Session implements ServerParser.Listener
{
private static final Logger LOG = Log.getLogger(HTTP2ServerSession.class);
private final ServerSessionListener listener;
public HTTP2ServerSession(Scheduler scheduler, EndPoint endPoint, Generator generator, ServerSessionListener listener, FlowControlStrategy flowControl)
{
super(scheduler, endPoint, generator, listener, flowControl, 2);
this.listener = listener;
}
@Override
public void onPreface()
{
// SPEC: send a SETTINGS frame upon receiving the preface.
Map<Integer, Integer> settings = notifyPreface(this);
if (settings == null)
settings = Collections.emptyMap();
SettingsFrame settingsFrame = new SettingsFrame(settings, false);
int sessionWindow = getInitialSessionRecvWindow() - FlowControlStrategy.DEFAULT_WINDOW_SIZE;
updateRecvWindow(sessionWindow);
if (sessionWindow > 0)
frames(null, Arrays.asList(settingsFrame, new WindowUpdateFrame(0, sessionWindow)), Callback.NOOP);
else
frames(null, Collections.singletonList(settingsFrame), Callback.NOOP);
}
@Override
public void onHeaders(HeadersFrame frame)
{
if (LOG.isDebugEnabled())
LOG.debug("Received {}", frame);
int streamId = frame.getStreamId();
if (!isClientStream(streamId))
{
onConnectionFailure(ErrorCode.PROTOCOL_ERROR.code, "invalid_stream_id");
return;
}
IStream stream = getStream(streamId);
MetaData metaData = frame.getMetaData();
if (metaData.isRequest())
{
if (stream == null)
{
if (isRemoteStreamClosed(streamId))
{
onConnectionFailure(ErrorCode.STREAM_CLOSED_ERROR.code, "unexpected_headers_frame");
}
else
{
stream = createRemoteStream(streamId);
if (stream != null)
{
onStreamOpened(stream);
stream.process(frame, Callback.NOOP);
boolean closed = stream.updateClose(frame.isEndStream(), CloseState.Event.RECEIVED);
Stream.Listener listener = notifyNewStream(stream, frame);
stream.setListener(listener);
if (closed)
removeStream(stream);
}
}
}
else
{
onConnectionFailure(ErrorCode.PROTOCOL_ERROR.code, "duplicate_stream");
}
}
else if (metaData.isResponse())
{
onConnectionFailure(ErrorCode.PROTOCOL_ERROR.code, "invalid_request");
}
else
{
// Trailers.
if (stream != null)
{
stream.process(frame, Callback.NOOP);
boolean closed = stream.updateClose(frame.isEndStream(), CloseState.Event.RECEIVED);
notifyHeaders(stream, frame);
if (closed)
removeStream(stream);
}
else
{
if (LOG.isDebugEnabled())
LOG.debug("Stream #{} not found", streamId);
onConnectionFailure(ErrorCode.PROTOCOL_ERROR.code, "unexpected_headers_frame");
}
}
}
@Override
public void onPushPromise(PushPromiseFrame frame)
{
onConnectionFailure(ErrorCode.PROTOCOL_ERROR.code, "push_promise");
}
private Map<Integer, Integer> notifyPreface(Session session)
{
try
{
return listener.onPreface(session);
}
catch (Throwable x)
{
LOG.info("Failure while notifying listener " + listener, x);
return null;
}
}
@Override
public void onFrame(Frame frame)
{
switch (frame.getType())
{
case PREFACE:
onPreface();
break;
case SETTINGS:
// SPEC: the required reply to this SETTINGS frame is the 101 response.
onSettings((SettingsFrame)frame, false);
break;
case HEADERS:
onHeaders((HeadersFrame)frame);
break;
default:
super.onFrame(frame);
break;
}
}
}