ReverseDNSPostProcessor.java

/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
 * (c) 2001 - 2013 OpenPlans
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */
package org.geoserver.monitor;

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.geotools.util.SoftValueHashMap;
import org.geotools.util.logging.Logging;

public class ReverseDNSPostProcessor implements RequestPostProcessor {
    static final Logger LOGGER = Logging.getLogger(ReverseDNSPostProcessor.class);
    
    static Map<String, String> reverseLookupCache = new SoftValueHashMap<String, String>(100);
    
    public void run(RequestData data, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        String host = reverseLookupCache.get(data.getRemoteAddr());
        if(host == null) {
            try {
                InetAddress addr = InetAddress.getByName(data.getRemoteAddr());
                host = addr.getHostName();
            } catch(UnknownHostException e) {
                LOGGER.log(Level.FINE, "Error reverse looking up " + data.getRemoteAddr(), e);
            }
        }
        
        data.setRemoteHost(host);
    }

}