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/*
* Copyright (C) 2012 Facebook, Inc.
*
* 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 com.facebook.logging.log4j;
/**
* CustodianDailyRollingFileAppender.java
* Adapted from the Apache Log4j DailyRollingFileAppender to extend the functionality
* of the existing class so that the user can limit the number of log backups
* and compress the backups to conserve disk space.
* @author Ryan Kimber
* 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.
*/
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Calendar;
import java.util.TimeZone;
import java.util.Locale;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
//We have to import the log4j package because this class used to be in it and references other classes in that package.
import org.apache.log4j.*;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.spi.LoggingEvent;
/**
* CustodianDailyRollingFileAppender is based on
* {@link org.apache.log4j.appender.DailyRollingFileAppender} so most of the
* configuration options can be taken from the documentation on that class.
*/
public class CustodianLog4JDailyRollingFileAppender extends FileAppender
{
// The code assumes that the following constants are in a increasing
// sequence.
static final int TOP_OF_TROUBLE = -1;
static final int TOP_OF_MINUTE = 0;
static final int TOP_OF_HOUR = 1;
static final int HALF_DAY = 2;
static final int TOP_OF_DAY = 3;
static final int TOP_OF_WEEK = 4;
static final int TOP_OF_MONTH = 5;
/**
* The date pattern. By default, the pattern is set to "'.'yyyy-MM-dd"
* meaning daily rollover.
*/
private String datePattern = "'.'yyyy-MM-dd";
private String compressBackups = "false";
private String maxNumberOfDays = "7";
/**
* The log file will be renamed to the value of the scheduledFilename
* variable when the next interval is entered. For example, if the rollover
* period is one hour, the log file will be renamed to the value of
* "scheduledFilename" at the beginning of the next hour.
*
* The precise time when a rollover occurs depends on logging activity.
*/
private String scheduledFilename;
/**
* The next time we estimate a rollover should occur.
*/
private long nextCheck = System.currentTimeMillis() - 1;
Date now = new Date();
SimpleDateFormat sdf;
RollingCalendar rc = new RollingCalendar();
int checkPeriod = TOP_OF_TROUBLE;
// The gmtTimeZone is used only in computeCheckPeriod() method.
static final TimeZone gmtTimeZone = TimeZone.getTimeZone("GMT");
/**
* The default constructor does nothing.
*/
public CustodianLog4JDailyRollingFileAppender()
{
}
/**
* Instantiate a CustodianDailyRollingFileAppender and open the file
* designated by filename. The opened filename will become the ouput
* destination for this appender.
*/
public CustodianLog4JDailyRollingFileAppender(
Layout layout, String filename,
String datePattern
) throws IOException
{
super(layout, filename, true);
this.datePattern = datePattern;
activateOptions();
}
/**
* The DatePattern takes a string in the same format as expected by
* {@link SimpleDateFormat}. This options determines the rollover schedule.
*/
public void setDatePattern(String pattern)
{
datePattern = pattern;
}
/** Returns the value of the DatePattern option. */
public String getDatePattern()
{
return datePattern;
}
public void activateOptions()
{
super.activateOptions();
if (datePattern != null && fileName != null)
{
now.setTime(System.currentTimeMillis());
sdf = new SimpleDateFormat(datePattern);
int type = computeCheckPeriod();
printPeriodicity(type);
rc.setType(type);
File file = new File(fileName);
scheduledFilename = fileName
+ sdf.format(new Date(file.lastModified()));
} else
{
LogLog
.error("Either File or DatePattern options are not set for appender ["
+ name + "].");
}
}
void printPeriodicity(int type)
{
switch (type)
{
case TOP_OF_MINUTE:
LogLog.debug("Appender [" + name + "] to be rolled every minute.");
break;
case TOP_OF_HOUR:
LogLog.debug("Appender [" + name
+ "] to be rolled on top of every hour.");
break;
case HALF_DAY:
LogLog.debug("Appender [" + name
+ "] to be rolled at midday and midnight.");
break;
case TOP_OF_DAY:
LogLog.debug("Appender [" + name + "] to be rolled at midnight.");
break;
case TOP_OF_WEEK:
LogLog.debug("Appender [" + name
+ "] to be rolled at start of week.");
break;
case TOP_OF_MONTH:
LogLog.debug("Appender [" + name
+ "] to be rolled at start of every month.");
break;
default:
LogLog.warn("Unknown periodicity for appender [" + name + "].");
}
}
// This method computes the roll over period by looping over the
// periods, starting with the shortest, and stopping when the r0 is
// different from from r1, where r0 is the epoch formatted according
// the datePattern (supplied by the user) and r1 is the
// epoch+nextMillis(i) formatted according to datePattern. All date
// formatting is done in GMT and not local format because the test
// logic is based on comparisons relative to 1970-01-01 00:00:00
// GMT (the epoch).
int computeCheckPeriod()
{
RollingCalendar rollingCalendar = new RollingCalendar(gmtTimeZone,
Locale.ENGLISH);
// set sate to 1970-01-01 00:00:00 GMT
Date epoch = new Date(0);
if (datePattern != null)
{
for (int i = TOP_OF_MINUTE; i <= TOP_OF_MONTH; i++)
{
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(
datePattern);
simpleDateFormat.setTimeZone(gmtTimeZone); // do all date
// formatting in GMT
String r0 = simpleDateFormat.format(epoch);
rollingCalendar.setType(i);
Date next = new Date(rollingCalendar.getNextCheckMillis(epoch));
String r1 = simpleDateFormat.format(next);
// System.out.println("Type = "+i+", r0 = "+r0+", r1 = "+r1);
if (r0 != null && r1 != null && !r0.equals(r1))
{
return i;
}
}
}
return TOP_OF_TROUBLE; // Deliberately head for trouble...
}
/**
* Rollover the current file to a new file.
*/
void rollOver() throws IOException
{
/* Compute filename, but only if datePattern is specified */
if (datePattern == null)
{
errorHandler.error("Missing DatePattern option in rollOver().");
return;
}
String datedFilename = fileName + sdf.format(now);
// It is too early to roll over because we are still within the
// bounds of the current interval. Rollover will occur once the
// next interval is reached.
if (scheduledFilename.equals(datedFilename))
{
return;
}
// close current file, and rename it to datedFilename
this.closeFile();
File target = new File(scheduledFilename);
if (target.exists())
{
target.delete();
}
File file = new File(fileName);
boolean result = file.renameTo(target);
if (result)
{
LogLog.debug(fileName + " -> " + scheduledFilename);
} else
{
LogLog.error("Failed to rename [" + fileName + "] to ["
+ scheduledFilename + "].");
}
try
{
// This will also close the file. This is OK since multiple
// close operations are safe.
this.setFile(fileName, false, this.bufferedIO, this.bufferSize);
} catch (IOException e)
{
errorHandler.error("setFile(" + fileName + ", false) call failed.");
}
scheduledFilename = datedFilename;
}
/**
* This method differentiates DailyRollingFileAppender from its super class.
*
*
* Before actually logging, this method will check whether it is time to do
* a rollover. If it is, it will schedule the next rollover time and then
* rollover.
* */
protected void subAppend(LoggingEvent event)
{
long n = System.currentTimeMillis();
if (n >= nextCheck)
{
now.setTime(n);
nextCheck = rc.getNextCheckMillis(now);
try
{
cleanupAndRollOver();
}
catch (IOException ioe)
{
LogLog.error("cleanupAndRollover() failed.", ioe);
}
}
super.subAppend(event);
}
public String getCompressBackups()
{
return compressBackups;
}
public void setCompressBackups(String compressBackups)
{
this.compressBackups = compressBackups;
}
public String getMaxNumberOfDays()
{
return maxNumberOfDays;
}
public void setMaxNumberOfDays(String maxNumberOfDays)
{
this.maxNumberOfDays = maxNumberOfDays;
}
/*
* This method checks to see if we're exceeding the number of log backups
* that we are supposed to keep, and if so, deletes the offending files. It
* then delegates to the rollover method to rollover to a new file if
* required.
*/
protected void cleanupAndRollOver() throws IOException
{
// Check to see if there are already 5 files
File file = new File(fileName);
Calendar cal = Calendar.getInstance();
int maxDays = 7;
try
{
maxDays = Integer.parseInt(getMaxNumberOfDays());
} catch (Exception e)
{
// just leave it at 7.
}
cal.add(Calendar.DATE, -maxDays);
Date cutoffDate = cal.getTime();
if (file.getParentFile().exists())
{
File[] files = file.getParentFile().listFiles(
new StartsWithFileFilter(file.getName(), false));
int nameLength = file.getName().length();
for (int i = 0; i < files.length; i++)
{
String datePart = null;
try
{
datePart = files[i].getName().substring(nameLength);
Date date = sdf.parse(datePart);
if (date.before(cutoffDate))
{
files[i].delete();
}
//If we're supposed to zip files and this isn't already a zip
else if(getCompressBackups().equalsIgnoreCase("YES") || getCompressBackups().equalsIgnoreCase("TRUE"))
{
zipAndDelete(files[i]);
}
}
catch (Exception pe)
{
// This isn't a file we should touch (it isn't named
// correctly)
}
}
}
rollOver();
}
/**
* Compresses the passed file to a .zip file, stores the .zip in the
* same directory as the passed file, and then deletes the original,
* leaving only the .zipped archive.
* @param file
*/
private void zipAndDelete(File file) throws IOException
{
if(!file.getName().endsWith(".zip"))
{
File zipFile = new File(file.getParent(), file.getName() + ".zip");
FileInputStream fis = new FileInputStream(file);
FileOutputStream fos = new FileOutputStream(zipFile);
ZipOutputStream zos = new ZipOutputStream(fos);
ZipEntry zipEntry = new ZipEntry(file.getName());
zos.putNextEntry(zipEntry);
byte[] buffer = new byte[4096];
while(true)
{
int bytesRead = fis.read(buffer);
if(bytesRead == -1) break;
else
{
zos.write(buffer, 0, bytesRead);
}
}
zos.closeEntry();
fis.close();
zos.close();
file.delete();
}
}
class StartsWithFileFilter implements FileFilter
{
private String startsWith;
private boolean inclDirs = false;
/**
*
*/
public StartsWithFileFilter(String startsWith,
boolean includeDirectories)
{
super();
this.startsWith = startsWith.toUpperCase();
inclDirs = includeDirectories;
}
/*
* (non-Javadoc)
*
* @see java.io.FileFilter#accept(java.io.File)
*/
public boolean accept(File pathname)
{
if (!inclDirs && pathname.isDirectory())
{
return false;
} else
return pathname.getName().toUpperCase().startsWith(startsWith);
}
}
}
/**
* RollingCalendar is a helper class to DailyRollingFileAppender. Given a
* periodicity type and the current time, it computes the start of the next
* interval.
* */
class RollingCalendar extends GregorianCalendar
{
private static final long serialVersionUID = -3560331770601814177L;
int type = CustodianLog4JDailyRollingFileAppender.TOP_OF_TROUBLE;
RollingCalendar()
{
super();
}
RollingCalendar(TimeZone tz, Locale locale)
{
super(tz, locale);
}
void setType(int type)
{
this.type = type;
}
public long getNextCheckMillis(Date now)
{
return getNextCheckDate(now).getTime();
}
public Date getNextCheckDate(Date now)
{
this.setTime(now);
switch (type)
{
case CustodianLog4JDailyRollingFileAppender.TOP_OF_MINUTE:
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.MINUTE, 1);
break;
case CustodianLog4JDailyRollingFileAppender.TOP_OF_HOUR:
this.set(Calendar.MINUTE, 0);
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.HOUR_OF_DAY, 1);
break;
case CustodianLog4JDailyRollingFileAppender.HALF_DAY:
this.set(Calendar.MINUTE, 0);
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
int hour = get(Calendar.HOUR_OF_DAY);
if (hour < 12)
{
this.set(Calendar.HOUR_OF_DAY, 12);
} else
{
this.set(Calendar.HOUR_OF_DAY, 0);
this.add(Calendar.DAY_OF_MONTH, 1);
}
break;
case CustodianLog4JDailyRollingFileAppender.TOP_OF_DAY:
this.set(Calendar.HOUR_OF_DAY, 0);
this.set(Calendar.MINUTE, 0);
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.DATE, 1);
break;
case CustodianLog4JDailyRollingFileAppender.TOP_OF_WEEK:
this.set(Calendar.DAY_OF_WEEK, getFirstDayOfWeek());
this.set(Calendar.HOUR_OF_DAY, 0);
this.set(Calendar.MINUTE, 0);
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.WEEK_OF_YEAR, 1);
break;
case CustodianLog4JDailyRollingFileAppender.TOP_OF_MONTH:
this.set(Calendar.DATE, 1);
this.set(Calendar.HOUR_OF_DAY, 0);
this.set(Calendar.MINUTE, 0);
this.set(Calendar.SECOND, 0);
this.set(Calendar.MILLISECOND, 0);
this.add(Calendar.MONTH, 1);
break;
default:
throw new IllegalStateException("Unknown periodicity type.");
}
return getTime();
}
}
