extendedaccesslogvalve.java

业界著名的tomcat服务器的最新6.0的源代码。

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache 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://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.apache.catalina.valves;


import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.TimeZone;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpSession;

import org.apache.catalina.Lifecycle;
import org.apache.catalina.LifecycleException;
import org.apache.catalina.LifecycleListener;
import org.apache.catalina.connector.Request;
import org.apache.catalina.connector.Response;
import org.apache.catalina.util.LifecycleSupport;
import org.apache.catalina.util.ServerInfo;
import org.apache.catalina.util.StringManager;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;



/**
 * An implementation of the W3c Extended Log File Format. See
 * http://www.w3.org/TR/WD-logfile.html for more information about the format.
 *
 * The following fields are supported:
 * <ul>
 * <li><code>c-dns</code>:  Client hostname</li>
 * <li><code>c-ip</code>:  Client ip address</li>
 * <li><code>bytes</code>:  bytes served</li>
 * <li><code>cs-method</code>:  request method</li>
 * <li><code>cs-uri</code>:  The full uri requested</li>
 * <li><code>cs-uri-query</code>:  The query string</li>
 * <li><code>cs-uri-stem</code>:  The uri without query string</li>
 * <li><code>date</code>:  The date in yyyy-mm-dd  format for GMT</li>
 * <li><code>s-dns</code>: The server dns entry </li>
 * <li><code>s-ip</code>:  The server ip address</li>
 * <li><code>cs(XXX)</code>:  The value of header XXX from client to server</li>
 * <li><code>sc(XXX)</code>: The value of header XXX from server to client </li>
 * <li><code>sc-status</code>:  The status code</li>
 * <li><code>time</code>:  Time the request was served</li>
 * <li><code>time-taken</code>:  Time (in seconds) taken to serve the request</li>
 * <li><code>x-A(XXX)</code>: Pull XXX attribute from the servlet context </li>
 * <li><code>x-C(XXX)</code>: Pull the first cookie of the name XXX </li>
 * <li><code>x-R(XXX)</code>: Pull XXX attribute from the servlet request </li>
 * <li><code>x-S(XXX)</code>: Pull XXX attribute from the session </li>
 * <li><code>x-P(...)</code>:  Call request.getParameter(...)
 *                             and URLencode it. Helpful to capture
 *                             certain POST parameters.
 * </li>
 * <li>For any of the x-H(...) the following method will be called from the
 *                HttpServletRequestObject </li>
 * <li><code>x-H(authType)</code>: getAuthType </li>
 * <li><code>x-H(characterEncoding)</code>: getCharacterEncoding </li>
 * <li><code>x-H(contentLength)</code>: getContentLength </li>
 * <li><code>x-H(locale)</code>:  getLocale</li>
 * <li><code>x-H(protocol)</code>: getProtocol </li>
 * <li><code>x-H(remoteUser)</code>:  getRemoteUser</li>
 * <li><code>x-H(requestedSessionId)</code>: getGequestedSessionId</li>
 * <li><code>x-H(requestedSessionIdFromCookie)</code>:
 *                  isRequestedSessionIdFromCookie </li>
 * <li><code>x-H(requestedSessionIdValid)</code>:
 *                  isRequestedSessionIdValid</li>
 * <li><code>x-H(scheme)</code>:  getScheme</li>
 * <li><code>x-H(secure)</code>:  isSecure</li>
 * </ul>
 *
 *
 *
 * <p>
 * Log rotation can be on or off. This is dictated by the rotatable
 * property.
 * </p>
 *
 * <p>
 * For UNIX users, another field called <code>checkExists</code>is also
 * available. If set to true, the log file's existence will be checked before
 * each logging. This way an external log rotator can move the file
 * somewhere and tomcat will start with a new file.
 * </p>
 *
 * <p>
 * For JMX junkies, a public method called </code>rotate</code> has
 * been made available to allow you to tell this instance to move
 * the existing log file to somewhere else start writing a new log file.
 * </p>
 *
 * <p>
 * Conditional logging is also supported. This can be done with the
 * <code>condition</code> property.
 * If the value returned from ServletRequest.getAttribute(condition)
 * yields a non-null value. The logging will be skipped.
 * </p>
 *
 * <p>
 * For extended attributes coming from a getAttribute() call,
 * it is you responsibility to ensure there are no newline or
 * control characters.
 * </p>
 *
 *
 * @author Tim Funk
 * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
 */

public class ExtendedAccessLogValve
    extends ValveBase
    implements Lifecycle {


    // ----------------------------------------------------------- Constructors


    /**
     * Construct a new instance of this class with default property values.
     */
    public ExtendedAccessLogValve() {

        super();


    }


    // ----------------------------------------------------- Instance Variables
    private static Log log = LogFactory.getLog(ExtendedAccessLogValve.class);


    /**
     * The descriptive information about this implementation.
     */
    protected static final String info =
        "org.apache.catalina.valves.ExtendedAccessLogValve/1.0";


    /**
     * The lifecycle event support for this component.
     */
    protected LifecycleSupport lifecycle = new LifecycleSupport(this);



    /**
     * The string manager for this package.
     */
    private StringManager sm =
        StringManager.getManager(Constants.Package);


    /**
     * Has this component been started yet?
     */
    private boolean started = false;


    /**
     * The as-of date for the currently open log file, or a zero-length
     * string if there is no open log file.
     */
    private String dateStamp = "";


    /**
     * The PrintWriter to which we are currently logging, if any.
     */
    private PrintWriter writer = null;


    /**
     * The formatter for the date contained in the file name.
     */
    private SimpleDateFormat fileDateFormatter = null;


    /**
     * A date formatter to format a Date into a date in the format
     * "yyyy-MM-dd".
     */
    private SimpleDateFormat dateFormatter = null;


    /**
     * A date formatter to format a Date into a time in the format
     * "kk:mm:ss" (kk is a 24-hour representation of the hour).
     */
    private SimpleDateFormat timeFormatter = null;


    /**
     * Time taken formatter for 3 decimal places.
     */
     private DecimalFormat timeTakenFormatter = null;


    /**
     * My ip address. Look it up once and remember it. Dump this if we can
     * determine another reliable way to get server ip address since this
     * server may have many ip's.
     */
    private String myIpAddress = null;


    /**
     * My dns name. Look it up once and remember it. Dump this if we can
     * determine another reliable way to get server name address since this
     * server may have many ip's.
     */
    private String myDNSName = null;


    /**
     * Holder for all of the fields to log after the pattern is decoded.
     */
    private FieldInfo[] fieldInfos;


    /**
     * The current log file we are writing to. Helpful when checkExists
     * is true.
     */
    private File currentLogFile = null;



    /**
     * The system time when we last updated the Date that this valve
     * uses for log lines.
     */
    private Date currentDate = null;


    /**
     * Instant when the log daily rotation was last checked.
     */
    private long rotationLastChecked = 0L;


    /**
     * The directory in which log files are created.
     */
    private String directory = "logs";


    /**
     * The pattern used to format our access log lines.
     */
    private String pattern = null;


    /**
     * The prefix that is added to log file filenames.
     */
    private String prefix = "access_log.";


    /**
     * Should we rotate our log file? Default is true (like old behavior)
     */
    private boolean rotatable = true;


    /**
     * The suffix that is added to log file filenames.
     */
    private String suffix = "";


    /**
     * Are we doing conditional logging. default false.
     */
    private String condition = null;


    /**
     * Do we check for log file existence? Helpful if an external
     * agent renames the log file so we can automagically recreate it.
     */
    private boolean checkExists = false;


    /**
     * Date format to place in log file name. Use at your own risk!
     */
    private String fileDateFormat = null;


    // ------------------------------------------------------------- Properties


    /**
     * Return the directory in which we create log files.
     */
    public String getDirectory() {

        return (directory);

    }


    /**
     * Set the directory in which we create log files.
     *
     * @param directory The new log file directory
     */
    public void setDirectory(String directory) {

        this.directory = directory;

    }


    /**
     * Return descriptive information about this implementation.
     */
    public String getInfo() {

        return (info);

    }


    /**
     * Return the format pattern.
     */
    public String getPattern() {

        return (this.pattern);