Exemple #1
0
  public static NodeAddress lookupNode(byte[] id, NodeAddress seedNodeAddress, int serverPort)
      throws Exception {
    // start up a server socket to accept the connection
    ServerSocket serverSocket = new ServerSocket(serverPort);

    // send store data message to random node
    LookupNodeMsg lookupNodeMsg =
        new LookupNodeMsg(id, new NodeAddress("StoreData", null, serverPort), 0);
    lookupNodeMsg.addHop(seedNodeAddress);
    Socket seedSocket = new Socket(seedNodeAddress.getInetAddress(), seedNodeAddress.getPort());
    ObjectOutputStream seedOut = new ObjectOutputStream(seedSocket.getOutputStream());
    seedOut.writeObject(lookupNodeMsg);

    seedSocket.close();
    LOGGER.info(
        "Sent lookup node message with id '"
            + HexConverter.convertBytesToHex(id)
            + "' to node "
            + seedNodeAddress);

    // receive connection on server socket from node where data should reside
    Socket nodeSocket = serverSocket.accept();
    Message replyMsg = (Message) new ObjectInputStream(nodeSocket.getInputStream()).readObject();

    // ensure we get a node info message
    if (replyMsg.getMsgType() == Message.ERROR_MSG) {
      throw new Exception(((ErrorMsg) replyMsg).getMsg());
    } else if (replyMsg.getMsgType() != Message.NODE_INFO_MSG) {
      throw new Exception("Recieved an unexpected message type '" + replyMsg.getMsgType() + "'.");
    }

    // parse reply message
    NodeInfoMsg nodeInfoMsg = (NodeInfoMsg) replyMsg;
    if (nodeInfoMsg.getNodeAddress().getInetAddress() == null) {
      nodeInfoMsg.getNodeAddress().setInetAddress(nodeSocket.getInetAddress());
    }

    serverSocket.close();
    nodeSocket.close();
    return nodeInfoMsg.getNodeAddress();
  }
Exemple #2
0
  public static void main(String[] args) {
    int port = 0;
    String discoveryNodeAddr = null;
    int discoveryNodePort = 0;

    try {
      port = Integer.parseInt(args[0]);
      discoveryNodeAddr = args[1];
      discoveryNodePort = Integer.parseInt(args[2]);
    } catch (Exception e) {
      System.out.println("Usage: Client port controllerHosName controllerPort");
      System.exit(1);
    }

    String input = "";
    Scanner scanner = new Scanner(System.in);
    while (true) {
      try {
        System.out.print("Options\nS) Store File\nR) Retrieve File\nQ) Quit\nInput:");
        input = scanner.nextLine();

        if (input.equalsIgnoreCase("Q")) {
          break;
        } else if (!input.equalsIgnoreCase("S") && !input.equalsIgnoreCase("R")) {
          LOGGER.severe("Unknown input. Please reenter.");
          continue;
        }

        // read in the filename
        byte[] id = null;
        System.out.print("\tFilename:");
        File file = new File(scanner.nextLine());

        // read in id
        System.out.print("\tID (leave blank to auto generate one):");
        String idStr = scanner.nextLine();
        if (!idStr.equals("")) {
          id = HexConverter.convertHexToBytes(idStr);
        } else {
          short idValue = (short) (file.getName().hashCode() % (int) Short.MAX_VALUE);
          id = new byte[2];
          id[0] = (byte) (idValue & 0xff);
          id[1] = (byte) ((idValue >> 8) & 0xff);
        }

        // get random node
        NodeAddress seedNodeAddress = getRandomNode(discoveryNodeAddr, discoveryNodePort);

        // lookup id in cluster
        NodeAddress nodeAddress = lookupNode(id, seedNodeAddress, port);

        if (input.equalsIgnoreCase("S")) {
          if (!file.exists()) {
            throw new Exception("File '" + file.getName() + "' does not exist.");
          }

          // read data into buffer
          FileInputStream in = new FileInputStream(file);
          byte[] data = new byte[(int) file.length()];
          if (in.read(data) != data.length) {
            LOGGER.severe("Error reading data into buffer.");
            return;
          }

          in.close();

          // write data to the node
          WriteDataMsg writeDataMsg = new WriteDataMsg(id, data);
          Socket socket = new Socket(nodeAddress.getInetAddress(), nodeAddress.getPort());
          ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
          out.writeObject(writeDataMsg);

          socket.close();
          LOGGER.info(
              "Sent data with id '"
                  + HexConverter.convertBytesToHex(id)
                  + "' to node "
                  + nodeAddress
                  + ".");
        } else if (input.equalsIgnoreCase("R")) {
          // read in storage directory
          System.out.print("\tStorage Directory:");
          file = new File(scanner.nextLine() + File.separator + file.getName());
          file.getParentFile().mkdirs();

          // request file from node
          ReadDataMsg readDataMsg = new ReadDataMsg(id);
          Socket socket = new Socket(nodeAddress.getInetAddress(), nodeAddress.getPort());
          ObjectOutputStream socketOut = new ObjectOutputStream(socket.getOutputStream());
          socketOut.writeObject(readDataMsg);

          // parse reply message
          Message replyMsg = (Message) new ObjectInputStream(socket.getInputStream()).readObject();
          socket.close();

          if (replyMsg.getMsgType() == Message.ERROR_MSG) {
            throw new Exception(((ErrorMsg) replyMsg).getMsg());
          } else if (replyMsg.getMsgType() != Message.WRITE_DATA_MSG) {
            throw new Exception(
                "Recieved an unexpected message type '" + replyMsg.getMsgType() + "'.");
          }

          WriteDataMsg writeDataMsg = (WriteDataMsg) replyMsg;

          // write file contents
          FileOutputStream out = new FileOutputStream(file);
          for (byte b : writeDataMsg.getData()) {
            out.write(b);
          }

          out.close();
          LOGGER.info("Wrote data to file '" + file.getCanonicalPath() + "'.");
        } else if (!input.equalsIgnoreCase("Q")) {
          LOGGER.severe("Unknown input. Please reenter.");
        }
      } catch (Exception e) {
        e.printStackTrace();
        LOGGER.severe(e.getMessage());
      }
    }
  }