//
   //  ========================================================================
   //  Copyright (c) 1995-2016 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.client.http;
  
  import java.io.IOException;
  import java.nio.ByteBuffer;
  import java.util.Locale;
  
  import org.eclipse.jetty.client.HttpChannel;
  import org.eclipse.jetty.client.HttpExchange;
  import org.eclipse.jetty.client.HttpReceiver;
  import org.eclipse.jetty.client.HttpResponse;
  import org.eclipse.jetty.http.HttpField;
  import org.eclipse.jetty.http.HttpFields;
  import org.eclipse.jetty.http.MetaData;
  import org.eclipse.jetty.http2.ErrorCode;
  import org.eclipse.jetty.http2.api.Stream;
  import org.eclipse.jetty.http2.frames.DataFrame;
  import org.eclipse.jetty.http2.frames.HeadersFrame;
  import org.eclipse.jetty.http2.frames.PushPromiseFrame;
  import org.eclipse.jetty.http2.frames.ResetFrame;
  import org.eclipse.jetty.io.ByteBufferPool;
  import org.eclipse.jetty.util.BufferUtil;
  import org.eclipse.jetty.util.Callback;
  import org.eclipse.jetty.util.CompletableCallback;
  
  public class HttpReceiverOverHTTP2 extends HttpReceiver implements Stream.Listener
  {
      public HttpReceiverOverHTTP2(HttpChannel channel)
      {
          super(channel);
      }
  
      @Override
      protected HttpChannelOverHTTP2 getHttpChannel()
      {
          return (HttpChannelOverHTTP2)super.getHttpChannel();
      }
  
      @Override
      public void onHeaders(Stream stream, HeadersFrame frame)
      {
          HttpExchange exchange = getHttpExchange();
          if (exchange == null)
              return;
  
          HttpResponse response = exchange.getResponse();
          MetaData.Response metaData = (MetaData.Response)frame.getMetaData();
          response.version(metaData.getVersion()).status(metaData.getStatus()).reason(metaData.getReason());
  
          if (responseBegin(exchange))
          {
              HttpFields headers = metaData.getFields();
              for (HttpField header : headers)
              {
                  if (!responseHeader(exchange, header))
                      return;
              }
  
              if (responseHeaders(exchange))
              {
                  if (frame.isEndStream())
                      responseSuccess(exchange);
              }
          }
      }
  
      @Override
      public Stream.Listener onPush(Stream stream, PushPromiseFrame frame)
      {
          // Not supported.
          stream.reset(new ResetFrame(stream.getId(), ErrorCode.REFUSED_STREAM_ERROR.code), Callback.NOOP);
          return null;
      }
  
      @Override
      public void onData(Stream stream, DataFrame frame, Callback callback)
      {
          HttpExchange exchange = getHttpExchange();
          if (exchange == null)
          {
              callback.failed(new IOException("terminated"));
              return;
         }
 
         // We must copy the data since we do not know when the
         // application will consume the bytes and the parsing
         // will continue as soon as this method returns, eventually
         // leading to reusing the underlying buffer for more reads.
         ByteBufferPool byteBufferPool = getHttpDestination().getHttpClient().getByteBufferPool();
         ByteBuffer original = frame.getData();
         int length = original.remaining();
         final ByteBuffer copy = byteBufferPool.acquire(length, original.isDirect());
         BufferUtil.clearToFill(copy);
         copy.put(original);
         BufferUtil.flipToFlush(copy, 0);
 
         CompletableCallback delegate = new CompletableCallback()
         {
             @Override
             public void succeeded()
             {
                 byteBufferPool.release(copy);
                 callback.succeeded();
                 super.succeeded();
             }
 
             @Override
             public void failed(Throwable x)
             {
                 byteBufferPool.release(copy);
                 callback.failed(x);
                 super.failed(x);
             }
 
             @Override
             public void resume()
             {
                 if (frame.isEndStream())
                     responseSuccess(exchange);
             }
 
             @Override
             public void abort(Throwable failure)
             {
             }
         };
 
         responseContent(exchange, copy, delegate);
         if (!delegate.tryComplete())
             delegate.resume();
     }
 
     @Override
     public void onReset(Stream stream, ResetFrame frame)
     {
         HttpExchange exchange = getHttpExchange();
         if (exchange == null)
             return;
 
         ErrorCode error = ErrorCode.from(frame.getError());
         String reason = error == null ? "reset" : error.name().toLowerCase(Locale.ENGLISH);
         exchange.getRequest().abort(new IOException(reason));
     }
 
     @Override
     public void onTimeout(Stream stream, Throwable failure)
     {
         responseFailure(failure);
     }
 }