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//
// ========================================================================
// Copyright (c) 1995-2016 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.http2.server;
import java.nio.ByteBuffer;
import java.util.concurrent.atomic.AtomicBoolean;
import org.eclipse.jetty.http.HttpVersion;
import org.eclipse.jetty.http.MetaData;
import org.eclipse.jetty.http2.ErrorCode;
import org.eclipse.jetty.http2.IStream;
import org.eclipse.jetty.http2.api.Stream;
import org.eclipse.jetty.http2.frames.DataFrame;
import org.eclipse.jetty.http2.frames.HeadersFrame;
import org.eclipse.jetty.http2.frames.PushPromiseFrame;
import org.eclipse.jetty.http2.frames.ResetFrame;
import org.eclipse.jetty.server.Connector;
import org.eclipse.jetty.server.HttpChannel;
import org.eclipse.jetty.server.HttpTransport;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.Promise;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
public class HttpTransportOverHTTP2 implements HttpTransport
{
private static final Logger LOG = Log.getLogger(HttpTransportOverHTTP2.class);
private final AtomicBoolean commit = new AtomicBoolean();
private final Connector connector;
private final HTTP2ServerConnection connection;
private IStream stream;
public HttpTransportOverHTTP2(Connector connector, HTTP2ServerConnection connection)
{
this.connector = connector;
this.connection = connection;
}
@Override
public boolean isOptimizedForDirectBuffers()
{
// Because sent buffers are passed directly to the endpoint without
// copying we can defer to the endpoint
return connection.getEndPoint().isOptimizedForDirectBuffers();
}
public IStream getStream()
{
return stream;
}
public void setStream(IStream stream)
{
if (LOG.isDebugEnabled())
LOG.debug("{} setStream {}", this, stream.getId());
this.stream = stream;
}
public void recycle()
{
this.stream = null;
commit.set(false);
}
@Override
public void send(MetaData.Response info, boolean isHeadRequest, ByteBuffer content, boolean lastContent, Callback callback)
{
// info != null | content != 0 | last = true => commit + send/end
// info != null | content != 0 | last = false => commit + send
// info != null | content == 0 | last = true => commit/end
// info != null | content == 0 | last = false => commit
// info == null | content != 0 | last = true => send/end
// info == null | content != 0 | last = false => send
// info == null | content == 0 | last = true => send/end
// info == null | content == 0 | last = false => noop
boolean hasContent = BufferUtil.hasContent(content) && !isHeadRequest;
if (info != null)
{
if (commit.compareAndSet(false, true))
{
if (hasContent)
{
commit(info, false, new Callback()
{
@Override
public void succeeded()
{
if (LOG.isDebugEnabled())
LOG.debug("HTTP2 Response #{} committed", stream.getId());
send(content, lastContent, callback);
}
@Override
public void failed(Throwable x)
{
if (LOG.isDebugEnabled())
LOG.debug("HTTP2 Response #" + stream.getId() + " failed to commit", x);
callback.failed(x);
}
});
}
else
{
commit(info, lastContent, callback);
}
}
else
{
callback.failed(new IllegalStateException("committed"));
}
}
else
{
if (hasContent || lastContent)
{
send(content, lastContent, callback);
}
else
{
callback.succeeded();
}
}
}
@Override
public boolean isPushSupported()
{
return stream.getSession().isPushEnabled();
}
@Override
public void push(final MetaData.Request request)
{
if (!stream.getSession().isPushEnabled())
{
if (LOG.isDebugEnabled())
LOG.debug("HTTP/2 Push disabled for {}", request);
return;
}
if (LOG.isDebugEnabled())
LOG.debug("HTTP/2 Push {}",request);
stream.push(new PushPromiseFrame(stream.getId(), 0, request), new Promise<Stream>()
{
@Override
public void succeeded(Stream pushStream)
{
connection.push(connector, (IStream)pushStream, request);
}
@Override
public void failed(Throwable x)
{
if (LOG.isDebugEnabled())
LOG.debug("Could not push " + request, x);
}
}, new Stream.Listener.Adapter()); // TODO: handle reset from the client ?
}
private void commit(MetaData.Response info, boolean endStream, Callback callback)
{
if (LOG.isDebugEnabled())
{
LOG.debug("HTTP2 Response #{}:{}{} {}{}{}",
stream.getId(), System.lineSeparator(), HttpVersion.HTTP_2, info.getStatus(),
System.lineSeparator(), info.getFields());
}
HeadersFrame frame = new HeadersFrame(stream.getId(), info, null, endStream);
stream.headers(frame, callback);
}
private void send(ByteBuffer content, boolean lastContent, Callback callback)
{
if (LOG.isDebugEnabled())
{
LOG.debug("HTTP2 Response #{}: {} content bytes{}",
stream.getId(), content.remaining(), lastContent ? " (last chunk)" : "");
}
DataFrame frame = new DataFrame(stream.getId(), content, lastContent);
stream.data(frame, callback);
}
@Override
public void onCompleted()
{
if (!stream.isClosed())
{
// If the stream is not closed, it is still reading the request content.
// Send a reset to the other end so that it stops sending data.
stream.reset(new ResetFrame(stream.getId(), ErrorCode.CANCEL_STREAM_ERROR.code), Callback.NOOP);
// Now that this stream is reset, in-flight data frames will be consumed and discarded.
// Consume the existing queued data frames to avoid stalling the flow control.
HttpChannel channel = (HttpChannel)stream.getAttribute(IStream.CHANNEL_ATTRIBUTE);
channel.getRequest().getHttpInput().consumeAll();
}
}
@Override
public void abort(Throwable failure)
{
IStream stream = this.stream;
if (LOG.isDebugEnabled())
LOG.debug("HTTP2 Response #{} aborted", stream == null ? -1 : stream.getId());
if (stream != null)
stream.reset(new ResetFrame(stream.getId(), ErrorCode.INTERNAL_ERROR.code), Callback.NOOP);
}
}
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