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AsyncContentProducer.java
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AsyncContentProducer.java
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//
// ========================================================================
// Copyright (c) 1995-2021 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.server;
import java.util.concurrent.TimeUnit;
import org.eclipse.jetty.http.BadMessageException;
import org.eclipse.jetty.http.HttpStatus;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Non-blocking {@link ContentProducer} implementation. Calling {@link #nextContent()} will never block
* but will return null when there is no available content.
*/
class AsyncContentProducer implements ContentProducer
{
private static final Logger LOG = LoggerFactory.getLogger(AsyncContentProducer.class);
private final HttpChannel _httpChannel;
private HttpInput.Interceptor _interceptor;
private HttpInput.Content _rawContent;
private HttpInput.Content _transformedContent;
private boolean _error;
private long _firstByteTimeStamp = Long.MIN_VALUE;
private long _rawContentArrived;
AsyncContentProducer(HttpChannel httpChannel)
{
_httpChannel = httpChannel;
}
@Override
public void recycle()
{
if (LOG.isDebugEnabled())
LOG.debug("recycling {}", this);
_interceptor = null;
_rawContent = null;
_transformedContent = null;
_error = false;
_firstByteTimeStamp = Long.MIN_VALUE;
_rawContentArrived = 0L;
}
@Override
public HttpInput.Interceptor getInterceptor()
{
return _interceptor;
}
@Override
public void setInterceptor(HttpInput.Interceptor interceptor)
{
this._interceptor = interceptor;
}
@Override
public int available()
{
HttpInput.Content content = nextTransformedContent();
int available = content == null ? 0 : content.remaining();
if (LOG.isDebugEnabled())
LOG.debug("available = {} {}", available, this);
return available;
}
@Override
public boolean hasContent()
{
boolean hasContent = _rawContent != null;
if (LOG.isDebugEnabled())
LOG.debug("hasContent = {} {}", hasContent, this);
return hasContent;
}
@Override
public boolean isError()
{
if (LOG.isDebugEnabled())
LOG.debug("isError = {} {}", _error, this);
return _error;
}
@Override
public void checkMinDataRate()
{
long minRequestDataRate = _httpChannel.getHttpConfiguration().getMinRequestDataRate();
if (LOG.isDebugEnabled())
LOG.debug("checkMinDataRate [m={},t={}] {}", minRequestDataRate, _firstByteTimeStamp, this);
if (minRequestDataRate > 0 && _firstByteTimeStamp != Long.MIN_VALUE)
{
long period = System.nanoTime() - _firstByteTimeStamp;
if (period > 0)
{
long minimumData = minRequestDataRate * TimeUnit.NANOSECONDS.toMillis(period) / TimeUnit.SECONDS.toMillis(1);
if (getRawContentArrived() < minimumData)
{
if (LOG.isDebugEnabled())
LOG.debug("checkMinDataRate check failed {}", this);
BadMessageException bad = new BadMessageException(HttpStatus.REQUEST_TIMEOUT_408,
String.format("Request content data rate < %d B/s", minRequestDataRate));
if (_httpChannel.getState().isResponseCommitted())
{
if (LOG.isDebugEnabled())
LOG.debug("checkMinDataRate aborting channel {}", this);
_httpChannel.abort(bad);
}
failCurrentContent(bad);
throw bad;
}
}
}
}
@Override
public long getRawContentArrived()
{
if (LOG.isDebugEnabled())
LOG.debug("getRawContentArrived = {} {}", _rawContentArrived, this);
return _rawContentArrived;
}
@Override
public boolean consumeAll(Throwable x)
{
if (LOG.isDebugEnabled())
LOG.debug("consumeAll [e={}] {}", x, this);
failCurrentContent(x);
// A specific HttpChannel mechanism must be used as the following code
// does not guarantee that the channel will synchronously deliver all
// content it already contains:
// while (true)
// {
// HttpInput.Content content = _httpChannel.produceContent();
// ...
// }
// as the HttpChannel's produceContent() contract makes no such promise;
// for instance the H2 implementation calls Stream.demand() that may
// deliver the content asynchronously. Tests in StreamResetTest cover this.
boolean atEof = _httpChannel.failAllContent(x);
if (LOG.isDebugEnabled())
LOG.debug("failed all content of http channel EOF={} {}", atEof, this);
return atEof;
}
private void failCurrentContent(Throwable x)
{
if (_transformedContent != null && !_transformedContent.isSpecial())
{
if (_transformedContent != _rawContent)
{
if (LOG.isDebugEnabled())
LOG.debug("failing currently held transformed content {} {}", x, this);
_transformedContent.skip(_transformedContent.remaining());
_transformedContent.failed(x);
}
_transformedContent = null;
}
if (_rawContent != null && !_rawContent.isSpecial())
{
if (LOG.isDebugEnabled())
LOG.debug("failing currently held raw content {} {}", x, this);
_rawContent.skip(_rawContent.remaining());
_rawContent.failed(x);
_rawContent = null;
}
HttpInput.ErrorContent errorContent = new HttpInput.ErrorContent(x);
_transformedContent = errorContent;
_rawContent = errorContent;
}
@Override
public boolean onContentProducible()
{
if (LOG.isDebugEnabled())
LOG.debug("onContentProducible {}", this);
return _httpChannel.getState().onReadReady();
}
@Override
public HttpInput.Content nextContent()
{
HttpInput.Content content = nextTransformedContent();
if (LOG.isDebugEnabled())
LOG.debug("nextContent = {} {}", content, this);
if (content != null)
_httpChannel.getState().onReadIdle();
return content;
}
@Override
public void reclaim(HttpInput.Content content)
{
if (LOG.isDebugEnabled())
LOG.debug("reclaim {} {}", content, this);
if (_transformedContent == content)
{
content.succeeded();
if (_transformedContent == _rawContent)
_rawContent = null;
_transformedContent = null;
}
}
@Override
public boolean isReady()
{
HttpInput.Content content = nextTransformedContent();
if (content != null)
{
if (LOG.isDebugEnabled())
LOG.debug("isReady(), got transformed content {} {}", content, this);
return true;
}
_httpChannel.getState().onReadUnready();
while (_httpChannel.needContent())
{
content = nextTransformedContent();
if (LOG.isDebugEnabled())
LOG.debug("isReady(), got transformed content after needContent retry {} {}", content, this);
if (content != null)
{
_httpChannel.getState().onContentAdded();
return true;
}
else
{
// We could have read some rawContent but not enough to generate
// transformed content, so we need to call needContent() again
// to tell the channel that more content is needed.
if (LOG.isDebugEnabled())
LOG.debug("isReady(), could not transform content after needContent retry {}", this);
}
}
if (LOG.isDebugEnabled())
LOG.debug("isReady(), no content for needContent retry {}", this);
return false;
}
private HttpInput.Content nextTransformedContent()
{
if (LOG.isDebugEnabled())
LOG.debug("nextTransformedContent {}", this);
if (_rawContent == null)
{
_rawContent = produceRawContent();
if (_rawContent == null)
return null;
}
if (_transformedContent != null && _transformedContent.isEmpty())
{
if (_transformedContent != _rawContent)
_transformedContent.succeeded();
if (LOG.isDebugEnabled())
LOG.debug("nulling depleted transformed content {}", this);
_transformedContent = null;
}
while (_transformedContent == null)
{
if (_rawContent.isSpecial())
{
// TODO does EOF need to be passed to the interceptors?
// In case the _rawContent was set by consumeAll(), check the httpChannel
// to see if it has a more precise error. Otherwise, the exact same
// special content will be returned by the httpChannel.
HttpInput.Content refreshedRawContent = produceRawContent();
if (refreshedRawContent != null)
_rawContent = refreshedRawContent;
_error = _rawContent.getError() != null;
if (LOG.isDebugEnabled())
LOG.debug("raw content is special (with error = {}), returning it {}", _error, this);
return _rawContent;
}
if (_interceptor != null)
{
if (LOG.isDebugEnabled())
LOG.debug("using interceptor to transform raw content {}", this);
_transformedContent = _interceptor.readFrom(_rawContent);
}
else
{
if (LOG.isDebugEnabled())
LOG.debug("null interceptor, transformed content = raw content {}", this);
_transformedContent = _rawContent;
}
if (_transformedContent != null && _transformedContent.isEmpty())
{
if (_transformedContent != _rawContent)
_transformedContent.succeeded();
if (LOG.isDebugEnabled())
LOG.debug("nulling depleted transformed content {}", this);
_transformedContent = null;
}
if (_transformedContent == null)
{
if (_rawContent.isEmpty())
{
_rawContent.succeeded();
_rawContent = null;
if (LOG.isDebugEnabled())
LOG.debug("nulling depleted raw content {}", this);
_rawContent = produceRawContent();
if (_rawContent == null)
{
if (LOG.isDebugEnabled())
LOG.debug("produced null raw content, returning null, {}", this);
return null;
}
}
else
{
if (LOG.isDebugEnabled())
LOG.debug("raw content is not empty {}", this);
}
}
else
{
if (LOG.isDebugEnabled())
LOG.debug("transformed content is not empty {}", this);
}
}
if (LOG.isDebugEnabled())
LOG.debug("returning transformed content {}", this);
return _transformedContent;
}
private HttpInput.Content produceRawContent()
{
HttpInput.Content content = _httpChannel.produceContent();
if (content != null)
{
_rawContentArrived += content.remaining();
if (_firstByteTimeStamp == Long.MIN_VALUE)
_firstByteTimeStamp = System.nanoTime();
if (LOG.isDebugEnabled())
LOG.debug("produceRawContent updated rawContentArrived to {} and firstByteTimeStamp to {} {}", _rawContentArrived, _firstByteTimeStamp, this);
}
if (LOG.isDebugEnabled())
LOG.debug("produceRawContent produced {} {}", content, this);
return content;
}
@Override
public String toString()
{
return String.format("%s@%x[r=%s,t=%s,i=%s,error=%b,c=%s]",
getClass().getSimpleName(),
hashCode(),
_rawContent,
_transformedContent,
_interceptor,
_error,
_httpChannel
);
}
}