src/main/java/net/pterodactylus/fcp/FcpConnectionHandler.java

   1 /*
   2  * jFCPlib - FcpConnectionHandler.java - Copyright © 2008 David Roden
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 package net.pterodactylus.fcp;
  20
  21 import java.io.IOException;
  22 import java.io.InputStream;
  23 import java.nio.ByteBuffer;
  24 import java.nio.charset.Charset;
  25 import java.util.logging.Level;
  26 import java.util.logging.Logger;
  27
  28 /**
  29  * Handles an FCP connection to a node.
  30  *
  31  * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
  32  */
  33 class FcpConnectionHandler implements Runnable {
  34
  35         /** The logger. */
  36         private static final Logger logger = Logger.getLogger(FcpConnectionHandler.class.getName());
  37
  38         /** The underlying connection. */
  39         private final FcpConnection fcpConnection;
  40
  41         /** The input stream from the node. */
  42         private final InputStream remoteInputStream;
  43
  44         /** Whether to stop the connection handler. */
  45         private boolean shouldStop;
  46
  47         /** Whether the next read line feed should be ignored. */
  48         private boolean ignoreNextLinefeed;
  49
  50         /**
  51          * Creates a new connection handler that operates on the given connection
  52          * and input stream.
  53          *
  54          * @param fcpConnection
  55          *            The underlying FCP connection
  56          * @param remoteInputStream
  57          *            The input stream from the node
  58          */
  59         public FcpConnectionHandler(FcpConnection fcpConnection, InputStream remoteInputStream) {
  60                 this.fcpConnection = fcpConnection;
  61                 this.remoteInputStream = remoteInputStream;
  62         }
  63
  64         /**
  65          * {@inheritDoc}
  66          */
  67         @Override
  68         public void run() {
  69                 FcpMessage fcpMessage = null;
  70                 Throwable throwable = null;
  71                 while (true) {
  72                         synchronized (this) {
  73                                 if (shouldStop) {
  74                                         break;
  75                                 }
  76                         }
  77                         try {
  78                                 String line = readLine();
  79                                 logger.log(Level.FINEST, String.format("read line: %1$s", line));
  80                                 if (line == null) {
  81                                         break;
  82                                 }
  83                                 if (line.length() == 0) {
  84                                         continue;
  85                                 }
  86                                 line = line.trim();
  87                                 if (fcpMessage == null) {
  88                                         fcpMessage = new FcpMessage(line);
  89                                         continue;
  90                                 }
  91                                 if ("EndMessage".equalsIgnoreCase(line) || "Data".equalsIgnoreCase(line)) {
  92                                         fcpConnection.handleMessage(fcpMessage);
  93                                         fcpMessage = null;
  94                                 }
  95                                 int equalSign = line.indexOf('=');
  96                                 if (equalSign == -1) {
  97                                         /* something's fishy! */
  98                                         continue;
  99                                 }
 100                                 String field = line.substring(0, equalSign);
 101                                 String value = line.substring(equalSign + 1);
 102                                 assert fcpMessage != null: "fcp message is null";
 103                                 fcpMessage.setField(field, value);
 104                         } catch (IOException ioe1) {
 105                                 throwable = ioe1;
 106                                 break;
 107                         }
 108                 }
 109                 fcpConnection.handleDisconnect(throwable);
 110         }
 111
 112         /**
 113          * Stops the connection handler.
 114          */
 115         public void stop() {
 116                 synchronized (this) {
 117                         shouldStop = true;
 118                 }
 119         }
 120
 121         //
 122         // PRIVATE METHODS
 123         //
 124
 125         /**
 126          * Reads bytes from {@link #remoteInputStream} until ‘\r’ or ‘\n’ are
 127          * encountered and decodes the read bytes using UTF-8.
 128          *
 129          * @return The decoded line
 130          * @throws IOException
 131          *             if an I/O error occurs
 132          */
 133         private String readLine() throws IOException {
 134                 byte[] readBytes = new byte[512];
 135                 int readIndex = 0;
 136                 while (true) {
 137                         int nextByte = remoteInputStream.read();
 138                         if (nextByte == -1) {
 139                                 if (readIndex == 0) {
 140                                         return null;
 141                                 }
 142                                 break;
 143                         }
 144                         if (nextByte == 10) {
 145                                 if (!ignoreNextLinefeed) {
 146                                         break;
 147                                 }
 148                         }
 149                         ignoreNextLinefeed = false;
 150                         if (nextByte == 13) {
 151                                 ignoreNextLinefeed = true;
 152                                 break;
 153                         }
 154                         if (readIndex == readBytes.length) {
 155                                 /* recopy & enlarge array */
 156                                 byte[] newReadBytes = new byte[readBytes.length * 2];
 157                                 System.arraycopy(readBytes, 0, newReadBytes, 0, readBytes.length);
 158                                 readBytes = newReadBytes;
 159                         }
 160                         readBytes[readIndex++] = (byte) nextByte;
 161                 }
 162                 ByteBuffer byteBuffer = ByteBuffer.wrap(readBytes, 0, readIndex);
 163                 return Charset.forName("UTF-8").decode(byteBuffer).toString();
 164         }
 165
 166 }