Exemplo n.º 1
0
  /**
   * Reads file content by specified file path.
   *
   * <p>TODO: add file size checking, note that size checking and file content reading should be
   * done in an atomic way, which means that two separate instance processes is not the case.
   *
   * @param filePath path to file on machine instance
   * @param startFrom line number to start reading from
   * @param limit limitation on line
   * @return if {@code limit} and {@code startFrom} grater than 0 content from {@code startFrom} to
   *     {@code startFrom + limit} will be returned, if file contains less lines than {@code
   *     startFrom} empty content will be returned
   * @throws MachineException if any error occurs with file reading
   */
  @Override
  public String readFileContent(String filePath, int startFrom, int limit) throws MachineException {
    if (limit <= 0 || startFrom <= 0) {
      throw new MachineException(
          "Impossible to read file " + limit + " lines from " + startFrom + " line");
    }

    // command sed getting file content from startFrom line to (startFrom + limit)
    String bashCommand =
        format("sed -n \'%1$2s, %2$2sp\' %3$2s", startFrom, startFrom + limit, filePath);

    final String[] command = {"/bin/bash", "-c", bashCommand};

    ListLineConsumer lines = new ListLineConsumer();
    try {
      Exec exec = docker.createExec(container, false, command);
      docker.startExec(exec.getId(), new LogMessagePrinter(lines, LogMessage::getContent));
    } catch (IOException e) {
      throw new MachineException(
          format(
              "Error occurs while initializing command %s in docker container %s: %s",
              Arrays.toString(command), container, e.getLocalizedMessage()),
          e);
    }

    String content = lines.getText();
    if (content.contains("sed: can't read " + filePath + ": No such file or directory")
        || content.contains("cat: " + filePath + ": No such file or directory")) {
      throw new MachineException("File with path " + filePath + " not found");
    }
    return content;
  }
Exemplo n.º 2
0
 @Override
 public List<InstanceProcess> getProcesses() throws MachineException {
   List<InstanceProcess> processes = new LinkedList<>();
   try {
     final Exec exec =
         docker.createExec(container, false, "/bin/bash", "-c", GET_ALIVE_PROCESSES_COMMAND);
     docker.startExec(
         exec.getId(),
         logMessage -> {
           final String pidFilePath = logMessage.getContent().trim();
           final Matcher matcher = PID_FILE_PATH_PATTERN.matcher(pidFilePath);
           if (matcher.matches()) {
             final int virtualPid = Integer.parseInt(matcher.group(1));
             final InstanceProcess dockerProcess = machineProcesses.get(virtualPid);
             if (dockerProcess != null) {
               processes.add(dockerProcess);
             } else {
               LOG.warn(
                   "Machine process {} exists in container but missing in processes map",
                   virtualPid);
             }
           }
         });
     return processes;
   } catch (IOException e) {
     throw new MachineException(e);
   }
 }