1 /*
   2  * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.net.http;
  27 
  28 import java.io.IOException;
  29 import java.nio.ByteBuffer;
  30 
  31 class GoAwayFrame extends ErrorFrame {
  32 
  33     GoAwayFrame() {
  34         type = TYPE;
  35     }
  36 
  37     int lastStream;
  38     byte[] debugData = new byte[0];
  39 
  40     public static final int TYPE = 0x7;
  41 
  42     // Flags
  43     public static final int ACK = 0x1;
  44 
  45     public void setDebugData(byte[] debugData) {
  46         this.debugData = debugData;
  47     }
  48 
  49     @Override
  50     public String toString() {
  51         return super.toString() + " Debugdata: " + new String(debugData);
  52     }
  53 
  54     @Override
  55     String flagAsString(int flag) {
  56         switch (flag) {
  57         case ACK:
  58             return "ACK";
  59         }
  60         return super.flagAsString(flag);
  61     }
  62 
  63     public void setLastStream(int lastStream) {
  64         this.lastStream = lastStream;
  65     }
  66 
  67     public int getLastStream() {
  68         return this.lastStream;
  69     }
  70 
  71     public byte[] getDebugData() {
  72         return debugData;
  73     }
  74 
  75     @Override
  76     void readIncomingImpl(ByteBufferConsumer bc) throws IOException {
  77         if (length < 8) {
  78             throw new IOException("Invalid GoAway frame");
  79         }
  80         lastStream = bc.getInt() & 0x7fffffff;
  81         errorCode = bc.getInt();
  82         //debugData = bc.getBytes(8);
  83         int datalen = length - 8;
  84         if (datalen > 0) {
  85             debugData = bc.getBytes(datalen);
  86             Log.logError("GoAway debugData " + new String(debugData));
  87         }
  88     }
  89 
  90     @Override
  91     void writeOutgoing(ByteBufferGenerator bg) {
  92         super.writeOutgoing(bg);
  93         ByteBuffer buf = bg.getBuffer(length);
  94         buf.putInt(lastStream);
  95         buf.putInt(errorCode);
  96         if (length > 8) {
  97             buf.put(debugData);
  98         }
  99     }
 100 
 101     @Override
 102     void computeLength() {
 103         length = 8 + debugData.length;
 104     }
 105 }