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Qetcher Java client, OSGi bundle, minimal dependencies
//
// ========================================================================
// Copyright (c) 1995-2018 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;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Queue;
import java.util.Set;
import org.eclipse.jetty.http2.frames.Frame;
import org.eclipse.jetty.http2.frames.WindowUpdateFrame;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.io.EofException;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.IteratingCallback;
import org.eclipse.jetty.util.component.ContainerLifeCycle;
import org.eclipse.jetty.util.component.Dumpable;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
public class HTTP2Flusher extends IteratingCallback implements Dumpable
{
private static final Logger LOG = Log.getLogger(HTTP2Flusher.class);
private static final ByteBuffer[] EMPTY_BYTE_BUFFERS = new ByteBuffer[0];
private final Queue windows = new ArrayDeque<>();
private final Deque entries = new ArrayDeque<>();
private final Queue pendingEntries = new ArrayDeque<>();
private final Set processedEntries = new HashSet<>();
private final HTTP2Session session;
private final ByteBufferPool.Lease lease;
private Throwable terminated;
private Entry stalledEntry;
public HTTP2Flusher(HTTP2Session session)
{
this.session = session;
this.lease = new ByteBufferPool.Lease(session.getGenerator().getByteBufferPool());
}
public void window(IStream stream, WindowUpdateFrame frame)
{
Throwable closed;
synchronized (this)
{
closed = terminated;
if (closed == null)
windows.offer(new WindowEntry(stream, frame));
}
// Flush stalled data.
if (closed == null)
iterate();
}
public boolean prepend(Entry entry)
{
Throwable closed;
synchronized (this)
{
closed = terminated;
if (closed == null)
{
entries.offerFirst(entry);
if (LOG.isDebugEnabled())
LOG.debug("Prepended {}, entries={}", entry, entries.size());
}
}
if (closed == null)
return true;
closed(entry, closed);
return false;
}
public boolean append(Entry entry)
{
Throwable closed;
synchronized (this)
{
closed = terminated;
if (closed == null)
{
entries.offer(entry);
if (LOG.isDebugEnabled())
LOG.debug("Appended {}, entries={}", entry, entries.size());
}
}
if (closed == null)
return true;
closed(entry, closed);
return false;
}
private int getWindowQueueSize()
{
synchronized (this)
{
return windows.size();
}
}
public int getFrameQueueSize()
{
synchronized (this)
{
return entries.size();
}
}
@Override
protected Action process() throws Throwable
{
if (LOG.isDebugEnabled())
LOG.debug("Flushing {}", session);
synchronized (this)
{
if (terminated != null)
throw terminated;
WindowEntry windowEntry;
while ((windowEntry = windows.poll()) != null)
windowEntry.perform();
Entry entry;
while ((entry = entries.poll()) != null)
pendingEntries.offer(entry);
}
if (pendingEntries.isEmpty())
{
if (LOG.isDebugEnabled())
LOG.debug("Flushed {}", session);
return Action.IDLE;
}
while (true)
{
boolean progress = false;
if (pendingEntries.isEmpty())
break;
Iterator pending = pendingEntries.iterator();
while (pending.hasNext())
{
Entry entry = pending.next();
if (LOG.isDebugEnabled())
LOG.debug("Processing {}", entry);
// If the stream has been reset or removed,
// don't send the frame and fail it here.
if (entry.isStale())
{
if (LOG.isDebugEnabled())
LOG.debug("Stale {}", entry);
entry.failed(new EofException("reset"));
pending.remove();
continue;
}
try
{
if (entry.generate(lease))
{
if (LOG.isDebugEnabled())
LOG.debug("Generated {} frame bytes for {}", entry.getFrameBytesGenerated(), entry);
progress = true;
processedEntries.add(entry);
if (entry.getDataBytesRemaining() == 0)
pending.remove();
}
else
{
if (session.getSendWindow() <= 0 && stalledEntry == null)
{
stalledEntry = entry;
if (LOG.isDebugEnabled())
LOG.debug("Flow control stalled at {}", entry);
// Continue to process control frames.
}
}
}
catch (Throwable failure)
{
// Failure to generate the entry is catastrophic.
if (LOG.isDebugEnabled())
LOG.debug("Failure generating " + entry, failure);
failed(failure);
return Action.SUCCEEDED;
}
}
if (!progress)
break;
if (stalledEntry != null)
break;
int writeThreshold = session.getWriteThreshold();
if (lease.getTotalLength() >= writeThreshold)
{
if (LOG.isDebugEnabled())
LOG.debug("Write threshold {} exceeded", writeThreshold);
break;
}
}
List byteBuffers = lease.getByteBuffers();
if (byteBuffers.isEmpty())
{
finish();
return Action.IDLE;
}
if (LOG.isDebugEnabled())
LOG.debug("Writing {} buffers ({} bytes) - entries processed/pending {}/{}: {}/{}",
byteBuffers.size(),
lease.getTotalLength(),
processedEntries.size(),
pendingEntries.size(),
processedEntries,
pendingEntries);
session.getEndPoint().write(this, byteBuffers.toArray(EMPTY_BYTE_BUFFERS));
return Action.SCHEDULED;
}
void onFlushed(long bytes) throws IOException
{
// A single EndPoint write may be flushed multiple times (for example with SSL).
for (Entry entry : processedEntries)
bytes = entry.onFlushed(bytes);
}
@Override
public void succeeded()
{
if (LOG.isDebugEnabled())
LOG.debug("Written {} buffers - entries processed/pending {}/{}: {}/{}",
lease.getByteBuffers().size(),
processedEntries.size(),
pendingEntries.size(),
processedEntries,
pendingEntries);
finish();
super.succeeded();
}
private void finish()
{
lease.recycle();
processedEntries.forEach(Entry::succeeded);
processedEntries.clear();
if (stalledEntry != null)
{
int size = pendingEntries.size();
for (int i = 0; i < size; ++i)
{
Entry entry = pendingEntries.peek();
if (entry == stalledEntry)
break;
pendingEntries.poll();
pendingEntries.offer(entry);
}
stalledEntry = null;
}
}
@Override
protected void onCompleteSuccess()
{
throw new IllegalStateException();
}
@Override
protected void onCompleteFailure(Throwable x)
{
lease.recycle();
Throwable closed;
Set allEntries;
synchronized (this)
{
closed = terminated;
terminated = x;
if (LOG.isDebugEnabled())
LOG.debug(String.format("%s, entries processed/pending/queued=%d/%d/%d",
closed != null ? "Closing" : "Failing",
processedEntries.size(),
pendingEntries.size(),
entries.size()), x);
allEntries = new HashSet<>(entries);
entries.clear();
}
allEntries.addAll(processedEntries);
processedEntries.clear();
allEntries.addAll(pendingEntries);
pendingEntries.clear();
allEntries.forEach(entry -> entry.failed(x));
// If the failure came from within the
// flusher, we need to close the connection.
if (closed == null)
session.abort(x);
}
void terminate(Throwable cause)
{
Throwable closed;
synchronized (this)
{
closed = terminated;
terminated = cause;
if (LOG.isDebugEnabled())
LOG.debug("{}", closed != null ? "Terminated" : "Terminating");
}
if (closed == null)
iterate();
}
private void closed(Entry entry, Throwable failure)
{
entry.failed(failure);
}
@Override
public String dump()
{
return ContainerLifeCycle.dump(this);
}
@Override
public void dump(Appendable out, String indent) throws IOException
{
out.append(toString()).append(System.lineSeparator());
}
@Override
public String toString()
{
return String.format("%s[window_queue=%d,frame_queue=%d,processed/pending=%d/%d]",
super.toString(),
getWindowQueueSize(),
getFrameQueueSize(),
processedEntries.size(),
pendingEntries.size());
}
public static abstract class Entry extends Callback.Nested
{
protected final Frame frame;
protected final IStream stream;
protected Entry(Frame frame, IStream stream, Callback callback)
{
super(callback);
this.frame = frame;
this.stream = stream;
}
public abstract int getFrameBytesGenerated();
public int getDataBytesRemaining()
{
return 0;
}
protected abstract boolean generate(ByteBufferPool.Lease lease);
public abstract long onFlushed(long bytes) throws IOException;
@Override
public void failed(Throwable x)
{
if (stream != null)
{
stream.close();
stream.getSession().removeStream(stream);
}
super.failed(x);
}
private boolean isStale()
{
return !isProtocol() && stream != null && stream.isReset();
}
private boolean isProtocol()
{
switch (frame.getType())
{
case DATA:
case HEADERS:
case PUSH_PROMISE:
case CONTINUATION:
return false;
case PRIORITY:
case RST_STREAM:
case SETTINGS:
case PING:
case GO_AWAY:
case WINDOW_UPDATE:
case PREFACE:
case DISCONNECT:
return true;
default:
throw new IllegalStateException();
}
}
@Override
public String toString()
{
return frame.toString();
}
}
private class WindowEntry
{
private final IStream stream;
private final WindowUpdateFrame frame;
public WindowEntry(IStream stream, WindowUpdateFrame frame)
{
this.stream = stream;
this.frame = frame;
}
public void perform()
{
FlowControlStrategy flowControl = session.getFlowControlStrategy();
flowControl.onWindowUpdate(session, stream, frame);
}
}
}
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