com.facebook.presto.jdbc.internal.jetty.client.http.HttpReceiverOverHTTP Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995-2014 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 com.facebook.presto.jdbc.internal.jetty.client.http;
import java.io.EOFException;
import java.nio.ByteBuffer;
import com.facebook.presto.jdbc.internal.jetty.client.HttpClient;
import com.facebook.presto.jdbc.internal.jetty.client.HttpExchange;
import com.facebook.presto.jdbc.internal.jetty.client.HttpReceiver;
import com.facebook.presto.jdbc.internal.jetty.client.HttpResponse;
import com.facebook.presto.jdbc.internal.jetty.client.HttpResponseException;
import com.facebook.presto.jdbc.internal.jetty.http.HttpField;
import com.facebook.presto.jdbc.internal.jetty.http.HttpMethod;
import com.facebook.presto.jdbc.internal.jetty.http.HttpParser;
import com.facebook.presto.jdbc.internal.jetty.http.HttpVersion;
import com.facebook.presto.jdbc.internal.jetty.io.ByteBufferPool;
import com.facebook.presto.jdbc.internal.jetty.io.EndPoint;
import com.facebook.presto.jdbc.internal.jetty.util.BufferUtil;
import com.facebook.presto.jdbc.internal.jetty.util.CompletableCallback;
public class HttpReceiverOverHTTP extends HttpReceiver implements HttpParser.ResponseHandler
{
private final HttpParser parser = new HttpParser(this);
private ByteBuffer buffer;
private boolean shutdown;
public HttpReceiverOverHTTP(HttpChannelOverHTTP channel)
{
super(channel);
}
@Override
public HttpChannelOverHTTP getHttpChannel()
{
return (HttpChannelOverHTTP)super.getHttpChannel();
}
private HttpConnectionOverHTTP getHttpConnection()
{
return getHttpChannel().getHttpConnection();
}
public void receive()
{
HttpClient client = getHttpDestination().getHttpClient();
ByteBufferPool bufferPool = client.getByteBufferPool();
buffer = bufferPool.acquire(client.getResponseBufferSize(), true);
process();
}
private void process()
{
if (readAndParse())
{
HttpClient client = getHttpDestination().getHttpClient();
ByteBufferPool bufferPool = client.getByteBufferPool();
bufferPool.release(buffer);
// Don't linger the buffer around if we are idle.
buffer = null;
}
}
private boolean readAndParse()
{
HttpConnectionOverHTTP connection = getHttpConnection();
EndPoint endPoint = connection.getEndPoint();
ByteBuffer buffer = this.buffer;
while (true)
{
try
{
// Connection may be closed in a parser callback.
if (connection.isClosed())
{
if (LOG.isDebugEnabled())
LOG.debug("{} closed", connection);
return true;
}
if (!parse(buffer))
return false;
int read = endPoint.fill(buffer);
// Avoid boxing of variable 'read'
if (LOG.isDebugEnabled())
LOG.debug("Read {} bytes from {}", read, endPoint);
if (read > 0)
{
if (!parse(buffer))
return false;
}
else if (read == 0)
{
fillInterested();
return true;
}
else
{
shutdown();
return true;
}
}
catch (Throwable x)
{
if (LOG.isDebugEnabled())
LOG.debug(x);
failAndClose(x);
return true;
}
}
}
/**
* Parses a HTTP response from the given {@code buffer}.
*
* @param buffer the response bytes
* @return true to indicate that the parsing may proceed (for example with another response),
* false to indicate that the parsing should be interrupted (and will be resumed by another thread).
*/
private boolean parse(ByteBuffer buffer)
{
// Must parse even if the buffer is fully consumed, to allow the
// parser to advance from asynchronous content to response complete.
if (parser.parseNext(buffer))
{
// If the parser returns true, we need to differentiate two cases:
// A) the response is completed, so the parser is in START state;
// B) the content is handled asynchronously, so the parser is in CONTENT state.
return parser.isStart();
}
return true;
}
private void fillInterested()
{
getHttpChannel().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));
exchange.getResponse().version(version).status(status).reason(reason);
responseBegin(exchange);
return false;
}
@Override
public boolean parsedHeader(HttpField field)
{
HttpExchange exchange = getHttpExchange();
if (exchange == null)
return false;
responseHeader(exchange, field);
return false;
}
@Override
public boolean headerComplete()
{
HttpExchange exchange = getHttpExchange();
if (exchange == null)
return false;
responseHeaders(exchange);
return false;
}
@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();
}
public void abort(Throwable x)
{
failAndClose(x);
}
};
responseContent(exchange, buffer, callback);
return callback.tryComplete();
}
@Override
public boolean messageComplete()
{
HttpExchange exchange = getHttpExchange();
if (exchange == null)
return false;
responseSuccess(exchange);
return true;
}
@Override
public void earlyEOF()
{
HttpExchange exchange = getHttpExchange();
if (exchange == null)
getHttpConnection().close();
else
failAndClose(new EOFException());
}
@Override
public void badMessage(int status, String reason)
{
HttpExchange exchange = getHttpExchange();
if (exchange != null)
{
HttpResponse response = exchange.getResponse();
response.status(status).reason(reason);
failAndClose(new HttpResponseException("HTTP protocol violation: bad response", 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@%x on %s", getClass().getSimpleName(), hashCode(), getHttpConnection());
}
}