//
// ========================================================================
// Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.util;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoUnit;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import java.util.Timer;
import java.util.TimerTask;
/**
* RolloverFileOutputStream.
*
* <p>
* This output stream puts content in a file that is rolled over every 24 hours.
* The filename must include the string "yyyy_mm_dd", which is replaced with the
* actual date when creating and rolling over the file.
* </p>
* <p>
* Old files are retained for a number of days before being deleted.
* </p>
*/
public class RolloverFileOutputStream extends FilterOutputStream
{
private static Timer __rollover;
final static String YYYY_MM_DD="yyyy_mm_dd";
final static String ROLLOVER_FILE_DATE_FORMAT = "yyyy_MM_dd";
final static String ROLLOVER_FILE_BACKUP_FORMAT = "HHmmssSSS";
final static int ROLLOVER_FILE_RETAIN_DAYS = 31;
private RollTask _rollTask;
private SimpleDateFormat _fileBackupFormat;
private SimpleDateFormat _fileDateFormat;
private String _filename;
private File _file;
private boolean _append;
private int _retainDays;
/* ------------------------------------------------------------ */
/**
* @param filename The filename must include the string "yyyy_mm_dd",
* which is replaced with the actual date when creating and rolling over the file.
* @throws IOException if unable to create output
*/
public RolloverFileOutputStream(String filename)
throws IOException
{
this(filename,true,ROLLOVER_FILE_RETAIN_DAYS);
}
/* ------------------------------------------------------------ */
/**
* @param filename The filename must include the string "yyyy_mm_dd",
* which is replaced with the actual date when creating and rolling over the file.
* @param append If true, existing files will be appended to.
* @throws IOException if unable to create output
*/
public RolloverFileOutputStream(String filename, boolean append)
throws IOException
{
this(filename,append,ROLLOVER_FILE_RETAIN_DAYS);
}
/* ------------------------------------------------------------ */
/**
* @param filename The filename must include the string "yyyy_mm_dd",
* which is replaced with the actual date when creating and rolling over the file.
* @param append If true, existing files will be appended to.
* @param retainDays The number of days to retain files before deleting them. 0 to retain forever.
* @throws IOException if unable to create output
*/
public RolloverFileOutputStream(String filename,
boolean append,
int retainDays)
throws IOException
{
this(filename,append,retainDays,TimeZone.getDefault());
}
/* ------------------------------------------------------------ */
/**
* @param filename The filename must include the string "yyyy_mm_dd",
* which is replaced with the actual date when creating and rolling over the file.
* @param append If true, existing files will be appended to.
* @param retainDays The number of days to retain files before deleting them. 0 to retain forever.
* @param zone the timezone for the output
* @throws IOException if unable to create output
*/
public RolloverFileOutputStream(String filename,
boolean append,
int retainDays,
TimeZone zone)
throws IOException
{
this(filename,append,retainDays,zone,null,null,ZonedDateTime.now(zone.toZoneId()));
}
/* ------------------------------------------------------------ */
/**
* @param filename The filename must include the string "yyyy_mm_dd",
* which is replaced with the actual date when creating and rolling over the file.
* @param append If true, existing files will be appended to.
* @param retainDays The number of days to retain files before deleting them. 0 to retain forever.
* @param zone the timezone for the output
* @param dateFormat The format for the date file substitution. The default is "yyyy_MM_dd".
* @param backupFormat The format for the file extension of backup files. The default is "HHmmssSSS".
* @throws IOException if unable to create output
*/
public RolloverFileOutputStream(String filename,
boolean append,
int retainDays,
TimeZone zone,
String dateFormat,
String backupFormat)
throws IOException
{
this(filename,append,retainDays,zone,dateFormat,backupFormat,ZonedDateTime.now(zone.toZoneId()));
}
RolloverFileOutputStream(String filename,
boolean append,
int retainDays,
TimeZone zone,
String dateFormat,
String backupFormat,
ZonedDateTime now)
throws IOException
{
super(null);
if (dateFormat==null)
dateFormat=ROLLOVER_FILE_DATE_FORMAT;
_fileDateFormat = new SimpleDateFormat(dateFormat);
if (backupFormat==null)
backupFormat=ROLLOVER_FILE_BACKUP_FORMAT;
_fileBackupFormat = new SimpleDateFormat(backupFormat);
_fileBackupFormat.setTimeZone(zone);
_fileDateFormat.setTimeZone(zone);
if (filename!=null)
{
filename=filename.trim();
if (filename.length()==0)
filename=null;
}
if (filename==null)
throw new IllegalArgumentException("Invalid filename");
_filename=filename;
_append=append;
_retainDays=retainDays;
synchronized(RolloverFileOutputStream.class)
{
if (__rollover==null)
__rollover=new Timer(RolloverFileOutputStream.class.getName(),true);
// Calculate Today's Midnight, based on Configured TimeZone (will be in past, even if by a few milliseconds)
setFile(now);
// This will schedule the rollover event to the next midnight
scheduleNextRollover(now);
}
}
/* ------------------------------------------------------------ */
/**
* Get the "start of day" for the provided DateTime at the zone specified.
*
* @param now the date time to calculate from
* @return start of the day of the date provided
*/
public static ZonedDateTime toMidnight(ZonedDateTime now)
{
return now.toLocalDate().atStartOfDay(now.getZone()).plus(1, ChronoUnit.DAYS);
}
/* ------------------------------------------------------------ */
private void scheduleNextRollover(ZonedDateTime now)
{
_rollTask = new RollTask();
// Get tomorrow's midnight based on Configured TimeZone
ZonedDateTime midnight = toMidnight(now);
// Schedule next rollover event to occur, based on local machine's Unix Epoch milliseconds
long delay = midnight.toInstant().toEpochMilli() - now.toInstant().toEpochMilli();
__rollover.schedule(_rollTask,delay);
}
/* ------------------------------------------------------------ */
public String getFilename()
{
return _filename;
}
/* ------------------------------------------------------------ */
public String getDatedFilename()
{
if (_file==null)
return null;
return _file.toString();
}
/* ------------------------------------------------------------ */
public int getRetainDays()
{
return _retainDays;
}
/* ------------------------------------------------------------ */
synchronized void setFile(ZonedDateTime now)
throws IOException
{
// Check directory
File file = new File(_filename);
_filename=file.getCanonicalPath();
file=new File(_filename);
File dir= new File(file.getParent());
if (!dir.isDirectory() || !dir.canWrite())
throw new IOException("Cannot write log directory "+dir);
// Is this a rollover file?
String filename=file.getName();
int i=filename.toLowerCase(Locale.ENGLISH).indexOf(YYYY_MM_DD);
if (i>=0)
{
file=new File(dir,
filename.substring(0,i)+
_fileDateFormat.format(new Date(now.toInstant().toEpochMilli()))+
filename.substring(i+YYYY_MM_DD.length()));
}
if (file.exists()&&!file.canWrite())
throw new IOException("Cannot write log file "+file);
// Do we need to change the output stream?
if (out==null || !file.equals(_file))
{
// Yep
_file=file;
if (!_append && file.exists())
file.renameTo(new File(file.toString()+"."+_fileBackupFormat.format(new Date(now.toInstant().toEpochMilli()))));
OutputStream oldOut=out;
out=new FileOutputStream(file.toString(),_append);
if (oldOut!=null)
oldOut.close();
//if(log.isDebugEnabled())log.debug("Opened "+_file);
}
}
/* ------------------------------------------------------------ */
void removeOldFiles(ZonedDateTime now)
{
if (_retainDays>0)
{
// Establish expiration time, based on configured TimeZone
long expired = now.minus(_retainDays, ChronoUnit.DAYS).toInstant().toEpochMilli();
File file= new File(_filename);
File dir = new File(file.getParent());
String fn=file.getName();
int s=fn.toLowerCase(Locale.ENGLISH).indexOf(YYYY_MM_DD);
if (s<0)
return;
String prefix=fn.substring(0,s);
String suffix=fn.substring(s+YYYY_MM_DD.length());
String[] logList=dir.list();
for (int i=0;i<logList.length;i++)
{
fn = logList[i];
if(fn.startsWith(prefix)&&fn.indexOf(suffix,prefix.length())>=0)
{
File f = new File(dir,fn);
if(f.lastModified() < expired)
{
f.delete();
}
}
}
}
}
/* ------------------------------------------------------------ */
@Override
public void write (byte[] buf)
throws IOException
{
out.write (buf);
}
/* ------------------------------------------------------------ */
@Override
public void write (byte[] buf, int off, int len)
throws IOException
{
out.write (buf, off, len);
}
/* ------------------------------------------------------------ */
@Override
public void close()
throws IOException
{
synchronized(RolloverFileOutputStream.class)
{
try{super.close();}
finally
{
out=null;
_file=null;
}
if (_rollTask != null)
{
_rollTask.cancel();
}
}
}
/* ------------------------------------------------------------ */
private class RollTask extends TimerTask
{
@Override
public void run()
{
try
{
synchronized(RolloverFileOutputStream.class)
{
ZonedDateTime now = ZonedDateTime.now(_fileDateFormat.getTimeZone().toZoneId());
RolloverFileOutputStream.this.setFile(now);
RolloverFileOutputStream.this.scheduleNextRollover(now);
RolloverFileOutputStream.this.removeOldFiles(now);
}
}
catch(Throwable t)
{
// Cannot log this exception to a LOG, as RolloverFOS can be used by logging
t.printStackTrace(System.err);
}
}
}
}