Metacat

/**

 *  '$RCSfile$'

 *    Purpose: A Class that implements replication for metacat

 *  Copyright: 2000 Regents of the University of California and the

 *             National Center for Ecological Analysis and Synthesis

 *    Authors: Chad Berkley

 *

 *   '$Author$'

 *     '$Date$'

 * '$Revision$'

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

package edu.ucsb.nceas.metacat;

import java.sql.*;

import java.net.*;

import java.lang.*;

import java.text.*;

import javax.servlet.*;

import javax.servlet.http.*;

  private Date firstTime;

  private boolean timedReplicationIsOn = false;

  private Vector fileLocks = new Vector();

  private Thread lockThread = null;

  private static final String TIMEREPLICATIONINTERVAl = "timedreplicationinterval";

  private static final String FIRSTTIME  = "firsttimedreplication";

  private static final int    TIMEINTERVALLIMIT = 7200000;

   * Initialize the servlet by creating appropriate database connections

   */

    //create a thread to do the delta-T check but don't execute it yet

    {

       timedReplicationIsOn = (new Boolean(util.getOption(TIMEREPLICATION ).trim())).booleanValue();

                                +firstTime.toString()+" minisec");

       if (timedReplicationIsOn)

           MetacatReplication.replLog("deltaT handler started with rate=" +

                   timeInterval + " mini seconds at " +firstTime.toString());

       }

    }

    catch (Exception e)

    {

        // the timed replication in Metacat.properties file has problem

        // so timed replication is setting to false;

                " in Metacat replication servlet init because " +

                e.getMessage());

        timedReplicationIsOn = false;

    }

  public void destroy()

    replicationDaemon.cancel();

    // Process the data and send back the response

    handleGetOrPost(request, response);

  }

  public void doPost(HttpServletRequest request, HttpServletResponse response)

    // Process the data and send back the response

    handleGetOrPost(request, response);

  }

  private void handleGetOrPost(HttpServletRequest request,

                               HttpServletResponse response)

                               throws ServletException, IOException

    //ServletOutputStream outPut = response.getOutputStream();

// REPLACED with running replication comminications over HTTPS

//    String requestingServerIP = request.getRemoteAddr();

//    InetAddress iaddr = InetAddress.getByName(requestingServerIP);

//    String requestingServer = iaddr.getHostName();

      String[] value = request.getParameterValues(name);

    String server = null;

      // check if the server is included in the list of replicated servers

           !action.equals("start") &&

           !action.equals("getall") ) {

        server = ((String[])params.get("server"))[0];

          return;

        } else {

        }

      {

          // start, stop, getall and servercontrol need to check

          // if user is administor

          HttpSession sess = request.getSession(true);

          String sess_id = "";

          String username = "";

          String[] groupnames = {""};

          Hashtable sessionHash = MetaCatServlet.getSessionHash();

          if (params.containsKey("sessionid"))

          {

             sess_id = ((String[]) params.get("sessionid"))[0];

             {

             }

           }

           username = (String) sess.getAttribute("username");

           if (!MetaCatUtil.isAdministrator(username, groupnames))

           {

               PrintWriter out = response.getWriter();

               out.print("<error>");

               out.print("The user \"" + username +

                       "\" is not authorized for this action.");

               out.print("</error>");

               out.close();

                       "\" is not authorized for this action: " +action);

                       "\" is not authorized for this action: " +action);

               return;

           }

      }// this is final else

      System.out.println("Error in MetacatReplication.handleGetOrPost: " +

                         e.getMessage() );

    }

      outStream.close();

      //read a specific docid from remote host, and store it into local host

    {

    PrintWriter out = response.getWriter();

      replicationDaemon.cancel();

      replicationDaemon = new Timer(true);

      MetaCatUtil.setOption(TIMEREPLICATION, (new Boolean(timedReplicationIsOn)).toString());

      MetacatReplication.replLog("deltaT handler stopped");

        timeInterval = new Long(

               new String(((String[])params.get("rate"))[0])).longValue();

        if(timeInterval < TIMEINTERVALLIMIT) {

            out.println("Replication deltaT rate cannot be less than "+

                    TIMEINTERVALLIMIT + " millisecs and system automatically setup the rate to "+TIMEINTERVALLIMIT);

      {

         firstTimeStr = ((String[])params.get("firsttime"))[0];

         try

         {

           firstTime = ReplicationHandler.combinateCurrentDateAndGivenTime(firstTimeStr);

         catch (Exception e)

         {

            throw new ServletException(e.getMessage());

         }

                                  +firstTime.toString()+" minisec");

      else

      {

          MetacatReplication.replErrorLog("You should specify the first time " +

                                          "to start a time replication");

                                  "to start a time replication");

      }

      timedReplicationIsOn = true;

      // save settings to property file

      MetaCatUtil.setOption(TIMEREPLICATION, (new Boolean(timedReplicationIsOn)).toString());

      // note we couldn't use firstTime object because it has date info

      // we only need time info such as 10:00 PM

      MetaCatUtil.setOption(FIRSTTIME, firstTimeStr);

      MetaCatUtil.setOption(TIMEREPLICATIONINTERVAl, (new Long(timeInterval)).toString());

      replicationDaemon = new Timer(true);

                                            timeInterval);

      out.println("<html><body>\"Get All\" Done</body></html>");

      //read a specific docid from remote host, and store it into local host

      handleUpdateRequest(out, params, response);

      //note that this could be replaced by a call to metacatServlet

      //handleGetDocumentAction().

      handleGetDocumentRequest(out, params, response);

      response.setContentType("text/html");

      out.println("<html><body>Test successfully</body></html>");

  /**

   * xml_replication.

   * action           subaction            other needed params

   * ---------------------------------------------------------

   * servercontrol    add                  server

   * servercontrol    delete               server

  private void handleServerControlRequest(PrintWriter out, Hashtable params,

                                          HttpServletResponse response)

  {

    String subaction = ((String[])params.get("subaction"))[0];

    int serialNumber = -1;

    PreparedStatement pstmt = null;

    String server = null;

    String dataReplicate = null;

    String hub = null;

      dbConn=DBConnectionPool.

               getDBConnection("MetacatReplication.handleServerControlRequest");

      serialNumber=dbConn.getCheckOutSerialNumber();

      if ( subaction.equals("add") ) {

        server = ((String[])params.get("server"))[0];

        dataReplicate = ((String[])params.get("datareplicate"))[0];

        //Get hub value

        hub = ((String[])params.get("hub"))[0];

                                      "'01/01/00', 'MM/DD/YY'), '" +

        pstmt = dbConn.prepareStatement("INSERT INTO xml_replication " +

                  "(server, last_checked, replicate, datareplicate, hub) " +

                                      dbAdapter.toDate("01/01/1980", "MM/DD/YYYY")

                                      replicate +"', '" +dataReplicate+"', '"

        out.println("<html><body><table border=\"1\">");

        out.println("<tr><td><b>server</b></td><td><b>last_checked</b></td><td>");

        out.println("<td><b>datareplicate</b></td>");

        out.println("<td><b>hub</b></td></tr>");

        //increase dbconnection usage

        dbConn.increaseUsageCount(1);

        ResultSet rs = pstmt.getResultSet();

        boolean tablehasrows = rs.next();

          out.println(rs.getString(3) + "</td><td>");

          out.println(rs.getString(5) + "</td><td>");

          out.println(rs.getString(6) + "</td></tr>");

        }

        out.println("</table></body></html>");

        // and import it as a trusted certificate

        String certURL = ((String[])params.get("certificate"))[0];

        downloadCertificate(certURL);

      } else if ( subaction.equals("delete") ) {

        out.println("<html><body><table border=\"1\">");

        out.println("<tr><td><b>server</b></td><td><b>last_checked</b></td><td>");

        out.println("<td><b>datareplicate</b></td>");

        out.println("<td><b>hub</b></td></tr>");

        //increase dbconnection usage

        dbConn.increaseUsageCount(1);

        ResultSet rs = pstmt.getResultSet();

        boolean tablehasrows = rs.next();

        while(tablehasrows)

        {

          out.println("<tr><td>" + rs.getString(2) + "</td><td>");

          out.println(rs.getString(3) + "</td><td>");

          out.println(rs.getString(5) + "</td><td>");

          out.println(rs.getString(6) + "</td></tr>");

        }

        out.println("</table></body></html>");

      // list servers in server list

      } else if ( subaction.equals("list") ) {

        out.println("<html><body><table border=\"1\">");

        out.println("<td><b>datareplicate</b></td>");

        out.println("<td><b>hub</b></td></tr>");

        ResultSet rs = pstmt.getResultSet();

        boolean tablehasrows = rs.next();

          out.println(rs.getString(5) + "</td><td>");

          out.println(rs.getString(6) + "</td></tr>");

        }

        out.println("</table></body></html>");

      {

    } catch(Exception e) {

                         "MetacatReplication.handleServerControlRequest " +

      e.printStackTrace(System.out);

    }

    {

      try

      {

        pstmt.close();

      }//try

      catch (SQLException ee)

      {

      finally

      {

        DBConnectionPool.returnDBConnection(dbConn, serialNumber);

      }//finally

    }//finally

  // download certificate with the public key from certURL and

  // upload it onto this server; it then must be imported as a

  // trusted certificate

                throws FileNotFoundException, IOException, MalformedURLException

  {

    MetaCatUtil util = new MetaCatUtil();

    String certPath = util.getOption("certPath"); //the path to be uploaded to

    String filename = certURL;

    int slash = Math.max(filename.lastIndexOf('/'), filename.lastIndexOf('\\'));

    if ( slash > -1 ) {

      filename = filename.substring(slash + 1);

    }

    File f = new File(certPath, filename);

        if ( f.exists() ) {

          throw new IOException("File already exist: " + f.getCanonicalFile());

          //if ( f.exists() && !f.canWrite() ) {

          //  throw new IOException("Not writable: " + f.getCanonicalFile());

        }

      } catch (SecurityException se) {

        // if a security manager exists,

        // its checkRead method is called for f.exist()

        // or checkWrite method is called for f.canWrite()

        throw se;

      }

      // that uses a default-sized output buffer

      FileOutputStream fos = new FileOutputStream(f);

      BufferedOutputStream out = new BufferedOutputStream(fos);

      // this should be http url

      URL url = new URL(certURL);

      BufferedInputStream bis = null;

      try {

        bis = new BufferedInputStream(url.openStream());

        byte[] buf = new byte[4 * 1024]; // 4K buffer

        int b = bis.read(buf);

        while (b != -1) {

          out.write(buf, 0, b);

          b = bis.read(buf);

        }

      } finally {

        if (bis != null) bis.close();

      }

      // the input and the output streams must be closed

      bis.close();

            out.close();

            fos.close();

  }

   * to the requesting server (remote server) for the specified docid.

   * Then store it in local database.

    String docid = ((String[])params.get("docid"))[0]; // sent the document

    String dbaction = "UPDATE"; // the default action is UPDATE

    int serverCode = 1;

    int serialNumber = -1;

      //if the url contains a dbaction then the default action is overridden

      if(params.containsKey("dbaction")) {

        //override = true; //we are now overriding the default action

      logMetacat.info("Force replication docid: "+docid);

      logMetacat.info("Force replication action: "+dbaction);

                +util.getLocalReplicationServerName()

                +"&action=read&docid=" + docid);

                               +"&action=getdocumentinfo&docid=" + docid);

      XMLReader docinfoParser = ReplicationHandler.initParser(dih);

      docinfoParser.parse(new InputSource(new StringReader(docInfoStr)));

      Hashtable docinfoHash = dih.getDocInfo();

      String updatedDate = (String)docinfoHash.get("date_updated");

      String docType = (String)docinfoHash.get("doctype");

      // this for eml2 and we need user eml2 parser

      {

      }

      else if (docType != null && (docType.trim()).equals(DocumentImpl.EML2_1_0NAMESPACE))

      {

      }

              getDBConnection("MetacatReplication.handleForceReplicateRequest");