ComponentsJsonParser.java

/**
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community License, Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of the License
 * at:
 *
 *   http://opensource.org/licenses/ecl2.txt
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 *
 */

package org.opencastproject.runtimeinfo;

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.util.HashSet;
import java.util.Set;

/**
 * Parses a text dump of components.json reports
 */
public final class ComponentsJsonParser {

  private static final Logger logger = LoggerFactory.getLogger(ComponentsJsonParser.class);

  /** Matches IPv4 addresses */
  public static final String IP_REGEX = "(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)";

  /**
   * Private constructor to disallow construction of this utility class.
   */
  private ComponentsJsonParser() {
  }

  /**
   * Main method
   *
   * @param args
   *          a string array containing the program args. The first arg should be the file path to the json.
   */
  public static void main(String[] args) {
    try {
      File f = new File(args[0]);
      FileInputStream fis = new FileInputStream(f);
      DataInputStream in = new DataInputStream(fis);
      BufferedReader br = new BufferedReader(new InputStreamReader(in));
      JSONParser parser = new JSONParser();

      Set<String> adminServers = new HashSet<String>();

      String strLine;
      while ((strLine = br.readLine()) != null) {
        JSONObject json;
        try {
          json = (JSONObject) parser.parse(strLine);
        } catch (Exception e) {
          // this was malformed
          continue;
        }
        String adminServer = (String) json.get("admin");
        adminServer = adminServer.substring(adminServer.indexOf("/") + 2);
        if (adminServer.contains(":")) {
          adminServer = adminServer.substring(0, adminServer.lastIndexOf(":"));
        }
        if (adminServer.matches(IP_REGEX)) {
          adminServer = InetAddress.getByName(adminServer).getHostName();
        }
        adminServers.add(adminServer);
      }
      in.close();

      logger.info("Admin Servers (" + adminServers.size() + ") :");
      for (String admin : adminServers) {
        logger.info("\t" + admin);
      }

    } catch (Exception e) {
      logger.info("Exception", e);
    }

  }
}