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//
// ========================================================================
// Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under
// the terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0
//
// This Source Code may also be made available under the following
// Secondary Licenses when the conditions for such availability set
// forth in the Eclipse Public License, v. 2.0 are satisfied:
// the Apache License v2.0 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.client.http;
import java.io.EOFException;
import java.nio.ByteBuffer;
import java.util.concurrent.atomic.LongAdder;
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.HttpClientTransport;
import org.eclipse.jetty.client.HttpExchange;
import org.eclipse.jetty.client.HttpReceiver;
import org.eclipse.jetty.client.HttpResponse;
import org.eclipse.jetty.client.HttpResponseException;
import org.eclipse.jetty.http.BadMessageException;
import org.eclipse.jetty.http.HttpField;
import org.eclipse.jetty.http.HttpMethod;
import org.eclipse.jetty.http.HttpParser;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.http.HttpVersion;
import org.eclipse.jetty.io.ByteBufferPool;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.io.RetainableByteBuffer;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.Callback;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class HttpReceiverOverHTTP extends HttpReceiver implements HttpParser.ResponseHandler
{
private static final Logger LOG = LoggerFactory.getLogger(HttpReceiverOverHTTP.class);
private final LongAdder inMessages = new LongAdder();
private final HttpParser parser;
private RetainableByteBuffer networkBuffer;
private boolean shutdown;
private boolean complete;
private boolean unsolicited;
private int status;
public HttpReceiverOverHTTP(HttpChannelOverHTTP channel)
{
super(channel);
HttpClient httpClient = channel.getHttpDestination().getHttpClient();
parser = new HttpParser(this, -1, httpClient.getHttpCompliance());
HttpClientTransport transport = httpClient.getTransport();
if (transport instanceof HttpClientTransportOverHTTP)
{
HttpClientTransportOverHTTP httpTransport = (HttpClientTransportOverHTTP)transport;
parser.setHeaderCacheSize(httpTransport.getHeaderCacheSize());
parser.setHeaderCacheCaseSensitive(httpTransport.isHeaderCacheCaseSensitive());
}
}
@Override
public HttpChannelOverHTTP getHttpChannel()
{
return (HttpChannelOverHTTP)super.getHttpChannel();
}
private HttpConnectionOverHTTP getHttpConnection()
{
return getHttpChannel().getHttpConnection();
}
protected ByteBuffer getResponseBuffer()
{
return networkBuffer == null ? null : networkBuffer.getBuffer();
}
@Override
public void receive()
{
if (networkBuffer == null)
acquireNetworkBuffer();
process();
}
private void acquireNetworkBuffer()
{
networkBuffer = newNetworkBuffer();
if (LOG.isDebugEnabled())
LOG.debug("Acquired {}", networkBuffer);
}
private void reacquireNetworkBuffer()
{
RetainableByteBuffer currentBuffer = networkBuffer;
if (currentBuffer == null)
throw new IllegalStateException();
if (currentBuffer.hasRemaining())
throw new IllegalStateException();
currentBuffer.release();
networkBuffer = newNetworkBuffer();
if (LOG.isDebugEnabled())
LOG.debug("Reacquired {} <- {}", currentBuffer, networkBuffer);
}
private RetainableByteBuffer newNetworkBuffer()
{
HttpClient client = getHttpDestination().getHttpClient();
ByteBufferPool bufferPool = client.getByteBufferPool();
boolean direct = client.isUseInputDirectByteBuffers();
return new RetainableByteBuffer(bufferPool, client.getResponseBufferSize(), direct);
}
private void releaseNetworkBuffer()
{
if (networkBuffer == null)
return;
networkBuffer.release();
if (LOG.isDebugEnabled())
LOG.debug("Released {}", networkBuffer);
networkBuffer = null;
}
protected ByteBuffer onUpgradeFrom()
{
ByteBuffer upgradeBuffer = null;
if (networkBuffer.hasRemaining())
{
HttpClient client = getHttpDestination().getHttpClient();
upgradeBuffer = BufferUtil.allocate(networkBuffer.remaining(), client.isUseInputDirectByteBuffers());
BufferUtil.clearToFill(upgradeBuffer);
BufferUtil.put(networkBuffer.getBuffer(), upgradeBuffer);
BufferUtil.flipToFlush(upgradeBuffer, 0);
}
releaseNetworkBuffer();
return upgradeBuffer;
}
private void process()
{
HttpConnectionOverHTTP connection = getHttpConnection();
EndPoint endPoint = connection.getEndPoint();
try
{
while (true)
{
// Always parse even empty buffers to advance the parser.
if (parse())
{
// Return immediately, as this thread may be in a race
// with e.g. another thread demanding more content.
return;
}
// Connection may be closed in a parser callback.
if (connection.isClosed())
{
if (LOG.isDebugEnabled())
LOG.debug("Closed {}", connection);
releaseNetworkBuffer();
return;
}
if (networkBuffer.getReferences() > 1)
reacquireNetworkBuffer();
// The networkBuffer may have been reacquired.
int read = endPoint.fill(networkBuffer.getBuffer());
if (LOG.isDebugEnabled())
LOG.debug("Read {} bytes in {} from {}", read, networkBuffer, endPoint);
if (read > 0)
{
connection.addBytesIn(read);
}
else if (read == 0)
{
releaseNetworkBuffer();
fillInterested();
return;
}
else
{
releaseNetworkBuffer();
shutdown();
return;
}
}
}
catch (Throwable x)
{
if (LOG.isDebugEnabled())
LOG.debug("Error processing {}", endPoint, x);
releaseNetworkBuffer();
failAndClose(x);
}
}
/**
* Parses an HTTP response in the receivers buffer.
*
* @return true to indicate that parsing should be interrupted (and will be resumed by another thread).
*/
private boolean parse()
{
while (true)
{
boolean handle = parser.parseNext(networkBuffer.getBuffer());
boolean failed = isFailed();
if (LOG.isDebugEnabled())
LOG.debug("Parse result={}, failed={}", handle, failed);
// When failed, it's safe to close the parser because there
// will be no races with other threads demanding more content.
if (failed)
parser.close();
if (handle)
return !failed;
boolean complete = this.complete;
this.complete = false;
if (LOG.isDebugEnabled())
LOG.debug("Parse complete={}, remaining {} {}", complete, networkBuffer.remaining(), parser);
if (complete)
{
int status = this.status;
this.status = 0;
if (status == HttpStatus.SWITCHING_PROTOCOLS_101)
return true;
}
if (networkBuffer.isEmpty())
return false;
if (complete)
{
if (LOG.isDebugEnabled())
LOG.debug("Discarding unexpected content after response: {}", networkBuffer);
networkBuffer.clear();
return false;
}
}
}
protected void fillInterested()
{
getHttpConnection().fillInterested();
}
private void shutdown()
{
// Mark this receiver as shutdown, so that we can
// close the connection when the exchange terminates.
// We cannot close the connection from here because
// the request may still be in process.
shutdown = true;
// Shutting down the parser may invoke messageComplete() or earlyEOF().
// In case of content delimited by EOF, without a Connection: close
// header, the connection will be closed at exchange termination
// thanks to the flag we have set above.
parser.atEOF();
parser.parseNext(BufferUtil.EMPTY_BUFFER);
}
protected boolean isShutdown()
{
return shutdown;
}
@Override
public void startResponse(HttpVersion version, int status, String reason)
{
HttpExchange exchange = getHttpExchange();
unsolicited = exchange == null;
if (exchange == null)
return;
this.status = status;
String method = exchange.getRequest().getMethod();
parser.setHeadResponse(HttpMethod.HEAD.is(method) ||
(HttpMethod.CONNECT.is(method) && status == HttpStatus.OK_200));
exchange.getResponse().version(version).status(status).reason(reason);
responseBegin(exchange);
}
@Override
public void parsedHeader(HttpField field)
{
HttpExchange exchange = getHttpExchange();
unsolicited |= exchange == null;
if (unsolicited)
return;
responseHeader(exchange, field);
}
@Override
public boolean headerComplete()
{
HttpExchange exchange = getHttpExchange();
unsolicited |= exchange == null;
if (unsolicited)
return false;
// Store the EndPoint is case of upgrades, tunnels, etc.
exchange.getRequest().getConversation().setAttribute(EndPoint.class.getName(), getHttpConnection().getEndPoint());
return !responseHeaders(exchange);
}
@Override
public boolean content(ByteBuffer buffer)
{
HttpExchange exchange = getHttpExchange();
unsolicited |= exchange == null;
if (unsolicited)
return false;
RetainableByteBuffer networkBuffer = this.networkBuffer;
networkBuffer.retain();
return !responseContent(exchange, buffer, Callback.from(networkBuffer::release, failure ->
{
networkBuffer.release();
failAndClose(failure);
}));
}
@Override
public boolean contentComplete()
{
return false;
}
@Override
public void parsedTrailer(HttpField trailer)
{
HttpExchange exchange = getHttpExchange();
unsolicited |= exchange == null;
if (unsolicited)
return;
exchange.getResponse().trailer(trailer);
}
@Override
public boolean messageComplete()
{
HttpExchange exchange = getHttpExchange();
if (exchange == null || unsolicited)
{
// We received an unsolicited response from the server.
getHttpConnection().close();
return false;
}
int status = exchange.getResponse().getStatus();
if (status != HttpStatus.CONTINUE_100)
{
inMessages.increment();
complete = true;
}
return !responseSuccess(exchange);
}
@Override
public void earlyEOF()
{
HttpExchange exchange = getHttpExchange();
HttpConnectionOverHTTP connection = getHttpConnection();
if (exchange == null || unsolicited)
connection.close();
else
failAndClose(new EOFException(String.valueOf(connection)));
}
@Override
public void badMessage(BadMessageException failure)
{
HttpExchange exchange = getHttpExchange();
if (exchange == null || unsolicited)
{
getHttpConnection().close();
}
else
{
HttpResponse response = exchange.getResponse();
response.status(failure.getCode()).reason(failure.getReason());
failAndClose(new HttpResponseException("HTTP protocol violation: bad response on " + getHttpConnection(), response, failure));
}
}
@Override
protected void reset()
{
super.reset();
parser.reset();
}
private void failAndClose(Throwable failure)
{
if (responseFailure(failure))
getHttpConnection().close(failure);
}
long getMessagesIn()
{
return inMessages.longValue();
}
@Override
public String toString()
{
return String.format("%s[%s]", super.toString(), parser);
}
}
