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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.client.http;
import java.io.EOFException;
import java.nio.ByteBuffer;
import org.eclipse.jetty.client.HttpClient;
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.util.BufferUtil;
import org.eclipse.jetty.util.CompletableCallback;
public class HttpReceiverOverHTTP extends HttpReceiver implements HttpParser.ResponseHandler
{
private final HttpParser parser;
private ByteBuffer buffer;
private boolean shutdown;
private boolean complete;
public HttpReceiverOverHTTP(HttpChannelOverHTTP channel)
{
super(channel);
parser = new HttpParser(this, -1, channel.getHttpDestination().getHttpClient().getHttpCompliance());
}
@Override
public HttpChannelOverHTTP getHttpChannel()
{
return (HttpChannelOverHTTP)super.getHttpChannel();
}
private HttpConnectionOverHTTP getHttpConnection()
{
return getHttpChannel().getHttpConnection();
}
protected ByteBuffer getResponseBuffer()
{
return buffer;
}
public void receive()
{
if (buffer == null)
acquireBuffer();
process();
}
private void acquireBuffer()
{
HttpClient client = getHttpDestination().getHttpClient();
ByteBufferPool bufferPool = client.getByteBufferPool();
buffer = bufferPool.acquire(client.getResponseBufferSize(), true);
}
private void releaseBuffer()
{
if (buffer == null)
throw new IllegalStateException();
if (BufferUtil.hasContent(buffer))
throw new IllegalStateException();
HttpClient client = getHttpDestination().getHttpClient();
ByteBufferPool bufferPool = client.getByteBufferPool();
bufferPool.release(buffer);
buffer = null;
}
protected ByteBuffer onUpgradeFrom()
{
if (BufferUtil.hasContent(buffer))
{
ByteBuffer upgradeBuffer = ByteBuffer.allocate(buffer.remaining());
upgradeBuffer.put(buffer).flip();
return upgradeBuffer;
}
return null;
}
private void process()
{
try
{
HttpConnectionOverHTTP connection = getHttpConnection();
EndPoint endPoint = connection.getEndPoint();
while (true)
{
boolean upgraded = connection != endPoint.getConnection();
// Connection may be closed or upgraded in a parser callback.
if (connection.isClosed() || upgraded)
{
if (LOG.isDebugEnabled())
LOG.debug("{} {}", connection, upgraded ? "upgraded" : "closed");
releaseBuffer();
return;
}
if (parse())
return;
int read = endPoint.fill(buffer);
if (LOG.isDebugEnabled())
LOG.debug("Read {} bytes {} from {}", read, BufferUtil.toDetailString(buffer), endPoint);
if (read > 0)
{
connection.addBytesIn(read);
if (parse())
return;
}
else if (read == 0)
{
releaseBuffer();
fillInterested();
return;
}
else
{
releaseBuffer();
shutdown();
return;
}
}
}
catch (Throwable x)
{
if (LOG.isDebugEnabled())
LOG.debug(x);
BufferUtil.clear(buffer);
if (buffer != null)
releaseBuffer();
failAndClose(x);
}
}
/**
* Parses a 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(buffer);
boolean complete = this.complete;
this.complete = false;
if (LOG.isDebugEnabled())
LOG.debug("Parsed {}, remaining {} {}", handle, buffer.remaining(), parser);
if (handle)
return true;
if (!buffer.hasRemaining())
return false;
if (complete)
{
if (LOG.isDebugEnabled())
LOG.debug("Discarding unexpected content after response: {}", BufferUtil.toDetailString(buffer));
BufferUtil.clear(buffer);
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 int getHeaderCacheSize()
{
// TODO get from configuration
return 256;
}
@Override
public boolean startResponse(HttpVersion version, int status, String reason)
{
HttpExchange exchange = getHttpExchange();
if (exchange == null)
return false;
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);
return !responseBegin(exchange);
}
@Override
public void parsedHeader(HttpField field)
{
HttpExchange exchange = getHttpExchange();
if (exchange == null)
return;
responseHeader(exchange, field);
}
@Override
public boolean headerComplete()
{
HttpExchange exchange = getHttpExchange();
if (exchange == null)
return false;
return !responseHeaders(exchange);
}
@Override
public boolean content(ByteBuffer buffer)
{
HttpExchange exchange = getHttpExchange();
if (exchange == null)
return false;
CompletableCallback callback = new CompletableCallback()
{
@Override
public void resume()
{
if (LOG.isDebugEnabled())
LOG.debug("Content consumed asynchronously, resuming processing");
process();
}
@Override
public void abort(Throwable x)
{
failAndClose(x);
}
};
// Do not short circuit these calls.
boolean proceed = responseContent(exchange, buffer, callback);
boolean async = callback.tryComplete();
return !proceed || async;
}
@Override
public boolean contentComplete()
{
return false;
}
@Override
public void parsedTrailer(HttpField trailer)
{
HttpExchange exchange = getHttpExchange();
if (exchange == null)
return;
exchange.getResponse().trailer(trailer);
}
@Override
public boolean messageComplete()
{
HttpExchange exchange = getHttpExchange();
if (exchange == null)
return false;
int status = exchange.getResponse().getStatus();
if (status != HttpStatus.CONTINUE_100)
complete = true;
boolean proceed = responseSuccess(exchange);
if (!proceed)
return true;
if (status == HttpStatus.SWITCHING_PROTOCOLS_101)
return true;
if (HttpMethod.CONNECT.is(exchange.getRequest().getMethod()) &&
status == HttpStatus.OK_200)
return true;
return false;
}
@Override
public void earlyEOF()
{
HttpExchange exchange = getHttpExchange();
HttpConnectionOverHTTP connection = getHttpConnection();
if (exchange == null)
connection.close();
else
failAndClose(new EOFException(String.valueOf(connection)));
}
@Override
public void badMessage(BadMessageException failure)
{
HttpExchange exchange = getHttpExchange();
if (exchange != null)
{
HttpResponse response = exchange.getResponse();
response.status(failure.getCode()).reason(failure.getReason());
failAndClose(new HttpResponseException("HTTP protocol violation: bad response on " + getHttpConnection(), response));
}
}
@Override
protected void reset()
{
super.reset();
parser.reset();
}
@Override
protected void dispose()
{
super.dispose();
parser.close();
}
private void failAndClose(Throwable failure)
{
if (responseFailure(failure))
getHttpConnection().close(failure);
}
@Override
public String toString()
{
return String.format("%s[%s]", super.toString(), parser);
}
}
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