fastcommonaccesslogvalve.java

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/*
 * Copyright 1999-2005 The Apache Software Foundation.
 * 
 * Licensed 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.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.TimeZone;

import javax.servlet.ServletException;

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.StringManager;


/**
 * <p>Implementation of the <b>Valve</b> interface that generates a web server
 * access log with the detailed line contents matching either the common or
 * combined patterns.  As an additional feature, automatic rollover of log files
 * when the date changes is also supported.</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>
 *
 * @author Craig R. McClanahan
 * @author Jason Brittain
 * @author Remy Maucherat
 * @version $Revision: 304032 $ $Date: 2005-07-27 11:11:55 -0400 (Wed, 27 Jul 2005) $
 */

public final class FastCommonAccessLogValve
    extends ValveBase
    implements Lifecycle {


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


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

        super();
        setPattern("common");


    }


    // ----------------------------------------------------- Instance Variables


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


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


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


    /**
     * The set of month abbreviations for log messages.
     */
    protected static final String months[] =
    { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
      "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };


    /**
     * If the current log pattern is the same as the common access log
     * format pattern, then we'll set this variable to true and log in
     * a more optimal and hard-coded way.
     */
    private boolean common = false;


    /**
     * For the combined format (common, plus useragent and referer), we do
     * the same
     */
    private boolean combined = false;


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


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


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


    /**
     * The PrintWriter to which we are currently logging, if any.
     */
    private PrintWriter writer = 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 Dates into a day string in the format
     * "dd".
     */
    private SimpleDateFormat dayFormatter = null;


    /**
     * A date formatter to format a Date into a month string in the format
     * "MM".
     */
    private SimpleDateFormat monthFormatter = null;


    /**
     * A date formatter to format a Date into a year string in the format
     * "yyyy".
     */
    private SimpleDateFormat yearFormatter = 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;


    /**
     * The system timezone.
     */
    private TimeZone timezone = null;

    
    /**
     * The time zone offset relative to GMT in text form when daylight saving
     * is not in operation.
     */
    private String timeZoneNoDST = null;
 
    /**
     * The time zone offset relative to GMT in text form when daylight saving
     * is in operation.
     */
    private String timeZoneDST = null;


    /**
     * The system time when we last updated the Date that this valve
     * uses for log lines.
     */
    private String currentDateString = null;
    
    
    /**
     * The instant where the date string was last updated.
     */
    private long currentDate = 0L;


    /**
     * When formatting log lines, we often use strings like this one (" ").
     */
    private String space = " ";


    /**
     * Resolve hosts.
     */
    private boolean resolveHosts = false;


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


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


    /**
     * 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);

    }


    /**
     * Set the format pattern, first translating any recognized alias.
     *
     * @param pattern The new pattern
     */
    public void setPattern(String pattern) {

        if (pattern == null)
            pattern = "";
        if (pattern.equals(Constants.AccessLog.COMMON_ALIAS))
            pattern = Constants.AccessLog.COMMON_PATTERN;
        if (pattern.equals(Constants.AccessLog.COMBINED_ALIAS))
            pattern = Constants.AccessLog.COMBINED_PATTERN;
        this.pattern = pattern;

        if (this.pattern.equals(Constants.AccessLog.COMBINED_PATTERN))
            combined = true;
        else
            combined = false;

    }


    /**
     * Return the log file prefix.
     */
    public String getPrefix() {

        return (prefix);

    }


    /**
     * Set the log file prefix.
     *
     * @param prefix The new log file prefix
     */
    public void setPrefix(String prefix) {

        this.prefix = prefix;

    }


    /**
     * Should we rotate the logs
     */
    public boolean isRotatable() {

        return rotatable;

    }


    /**
     * Set the value is we should we rotate the logs
     *
     * @param rotatable true is we should rotate.
     */
    public void setRotatable(boolean rotatable) {

        this.rotatable = rotatable;

    }


    /**
     * Return the log file suffix.
     */
    public String getSuffix() {

        return (suffix);

    }


    /**
     * Set the log file suffix.
     *
     * @param suffix The new log file suffix
     */
    public void setSuffix(String suffix) {

        this.suffix = suffix;

    }


    /**
     * Set the resolve hosts flag.
     *
     * @param resolveHosts The new resolve hosts value
     */
    public void setResolveHosts(boolean resolveHosts) {

        this.resolveHosts = resolveHosts;

    }


    /**
     * Get the value of the resolve hosts flag.
     */
    public boolean isResolveHosts() {

        return resolveHosts;

    }


    /**