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/**
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* '$RCSfile$'
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* Purpose: A Class that implements replication for metacat
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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* Authors: Chad Berkley
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*
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* '$Author: daigle $'
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* '$Date: 2009-03-25 13:41:15 -0800 (Wed, 25 Mar 2009) $'
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* '$Revision: 4861 $'
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.replication;
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import java.util.*;
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import java.io.*;
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import javax.servlet.*;
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import javax.servlet.http.*;
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import edu.ucsb.nceas.metacat.service.ServiceService;
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import edu.ucsb.nceas.metacat.service.SessionService;
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import edu.ucsb.nceas.metacat.shared.MetacatUtilException;
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import edu.ucsb.nceas.metacat.shared.ServiceException;
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import edu.ucsb.nceas.metacat.util.AuthUtil;
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import edu.ucsb.nceas.metacat.util.SessionData;
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import org.apache.log4j.Logger;
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public class ReplicationServlet extends HttpServlet {
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private static final long serialVersionUID = -2898600143193513155L;
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private static Logger logReplication = Logger.getLogger("ReplicationLogging");
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private static Logger logMetacat = Logger.getLogger(ReplicationServlet.class);
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/**
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* Initialize the servlet by creating appropriate database connections
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*/
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public void init(ServletConfig config) throws ServletException {
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try {
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// Register preliminary services
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ServiceService.registerService("ReplicationService", ReplicationService
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.getInstance());
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} catch (ServiceException se) {
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String errorMessage = "ReplicationServlet.init - Service problem while intializing Replication Servlet: "
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+ se.getMessage();
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logMetacat.error("ReplicationServlet.init - " + ReplicationService.METACAT_REPL_ERROR_MSG);
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logReplication.error(errorMessage);
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throw new ServletException(errorMessage);
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}
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}
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public void destroy() {
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//ServiceService.
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}
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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// Process the data and send back the response
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handleGetOrPost(request, response);
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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// Process the data and send back the response
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handleGetOrPost(request, response);
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}
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private void handleGetOrPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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PrintWriter out = response.getWriter();
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Hashtable<String, String[]> params = new Hashtable<String, String[]>();
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Enumeration<String> paramlist = request.getParameterNames();
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while (paramlist.hasMoreElements()) {
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String name = (String) paramlist.nextElement();
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String[] value = request.getParameterValues(name);
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params.put(name, value);
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}
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String action = "";
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if (!params.isEmpty() && params.get("action") != null) {
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action = ((String[]) params.get("action"))[0];
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}
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String server = null;
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try {
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// check if the server is included in the list of replicated servers
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if (!action.equals("servercontrol") && !action.equals("stop")
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&& !action.equals("start") && !action.equals("getall")) {
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server = ((String[]) params.get("server"))[0];
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if (ReplicationService.getServerCodeForServerName(server) == 0) {
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logReplication.debug("ReplicationServlet.handleGetOrPost - Action \"" + action + "\" rejected for server: "
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+ server);
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return;
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} else {
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logReplication.debug("ReplicationServlet.handleGetOrPost - Action \"" + action + "\" accepted for server: "
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+ server);
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}
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} else {
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// start, stop, getall and servercontrol need to check if user is administor
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HttpSession sess = request.getSession(true);
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SessionData sessionData = null;
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String sess_id = "";
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String username = "";
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String[] groupnames = { "" };
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if (params.containsKey("sessionid")) {
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sess_id = ((String[]) params.get("sessionid"))[0];
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logReplication.info("ReplicationServlet.handleGetOrPost - in has sessionid " + sess_id);
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if (SessionService.isSessionRegistered(sess_id)) {
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logReplication.info("ReplicationServlet.handleGetOrPost - find the id " + sess_id + " in hash table");
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sessionData = SessionService.getRegisteredSession(sess_id);
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}
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}
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if (sessionData == null) {
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sessionData = new SessionData(sess.getId(),
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(String) sess.getAttribute("username"),
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(String[]) sess.getAttribute("groups"),
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(String) sess.getAttribute("password"),
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(String) sess.getAttribute("name"));
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}
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username = sessionData.getUserName();
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logReplication.warn("ReplicationServlet.handleGetOrPost - The user name from session is: " + username);
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groupnames = sessionData.getGroupNames();
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if (!AuthUtil.isAdministrator(username, groupnames)) {
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out = response.getWriter();
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out.print("<error>");
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out.print("The user \"" + username
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+ "\" is not authorized for this action.");
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out.print("</error>");
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out.close();
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logReplication.warn("ReplicationServlet.handleGetOrPost - The user \"" + username
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+ "\" is not authorized for this action: " + action);
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return;
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}
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}// else
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if (action.equals("readdata")) {
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OutputStream outStream = response.getOutputStream();
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//to get the data file.
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ReplicationService.handleGetDataFileRequest(outStream, params, response);
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outStream.close();
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} else if (action.equals("forcereplicatedatafile")) {
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//read a specific docid from remote host, and store it into local host
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ReplicationService.handleForceReplicateDataFileRequest(params, request);
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} else if (action.equals("stop")) {
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// stop the replication server
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ReplicationService.getInstance().stopReplication();
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out.println("Replication Handler Stopped");
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} else if (action.equals("start")) {
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ReplicationService.getInstance().startReplication(params);
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out.println("Replication Handler Started");
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} else if (action.equals("getall")) {
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ReplicationService.getInstance().runOnce();
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response.setContentType("text/html");
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out.println("<html><body>\"Get All\" Done</body></html>");
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} else if (action.equals("forcereplicate")) {
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// read a specific docid from remote host, and store it into
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// local host
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ReplicationService.handleForceReplicateRequest(out, params, response,
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request);
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} else if (action.equals("forcereplicatedelete")) {
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// read a specific docid from remote host, and store it into
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// local host
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ReplicationService.handleForceReplicateDeleteRequest(out, params,
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response, request);
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} else if (action.equals("update")) {
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// request an update list from the server
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ReplicationService.handleUpdateRequest(out, params, response);
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} else if (action.equals("read")) {
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// request a specific document from the server
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// note that this could be replaced by a call to metacatServlet
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// handleGetDocumentAction().
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ReplicationService.handleGetDocumentRequest(out, params, response);
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} else if (action.equals("getlock")) {
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ReplicationService.handleGetLockRequest(out, params, response);
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} else if (action.equals("getdocumentinfo")) {
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ReplicationService.handleGetDocumentInfoRequest(out, params, response);
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} else if (action.equals("gettime")) {
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ReplicationService.handleGetTimeRequest(out, params, response);
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} else if (action.equals("getcatalog")) {
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ReplicationService.handleGetCatalogRequest(out, params, response, true);
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} else if (action.equals("servercontrol")) {
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ReplicationService.handleServerControlRequest(out, params, response);
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} else if (action.equals("test")) {
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response.setContentType("text/html");
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out.println("<html><body>Test successfully</body></html>");
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}
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} catch (ServiceException e) {
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logMetacat.error("ReplicationServlet.handleGetOrPost - " + ReplicationService.METACAT_REPL_ERROR_MSG);
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logReplication.error("ReplicationServlet.handleGetOrPost - Error in ReplicationServlet.handleGetOrPost: " + e.getMessage());
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} catch (MetacatUtilException mue) {
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logMetacat.error("ReplicationServlet.handleGetOrPost - " + ReplicationService.METACAT_REPL_ERROR_MSG);
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logReplication.error("ReplicationServlet.handleGetOrPost - Metacat utility error in ReplicationServlet.handleGetOrPost: "
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+ mue.getMessage());
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} finally {
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out.close();
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}
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}
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}
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