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/ *
*
* ( c ) Copyright Ascensio System Limited 2010 - 2020
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* General Public License ( GPL ) version 3 as published by the Free Software Foundation ( https : //www.gnu.org/copyleft/gpl.html).
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* THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY ; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
* FITNESS FOR A PARTICULAR PURPOSE . For more details , see GNU GPL at https : //www.gnu.org/copyleft/gpl.html
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* relevant author attributions when distributing the software . If the display of the logo in its graphic
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* /
using System ;
using System.Linq ;
using System.Threading ;
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using ASC.Common ;
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using ASC.Common.Logging ;
using ASC.Data.Backup.Storage ;
using Microsoft.Extensions.Options ;
namespace ASC.Data.Backup.Service
{
public class BackupCleanerService
{
private readonly object cleanerLock = new object ( ) ;
private Timer cleanTimer ;
private bool isStarted ;
private readonly ILog log ;
public TimeSpan Period { get ; set ; }
private readonly BackupStorageFactory backupStorageFactory ;
public BackupCleanerService ( IOptionsMonitor < ILog > options , BackupStorageFactory backupStorageFactory )
{
this . backupStorageFactory = backupStorageFactory ;
log = options . CurrentValue ;
Period = TimeSpan . FromMinutes ( 15 ) ;
}
public void Start ( )
{
if ( ! isStarted & & Period > TimeSpan . Zero )
{
log . Info ( "starting backup cleaner service..." ) ;
cleanTimer = new Timer ( _ = > DeleteExpiredBackups ( ) , null , TimeSpan . Zero , Period ) ;
log . Info ( "backup cleaner service started" ) ;
isStarted = true ;
}
}
public void Stop ( )
{
if ( isStarted )
{
log . Info ( "stopping backup cleaner service..." ) ;
if ( cleanTimer ! = null )
{
cleanTimer . Change ( Timeout . Infinite , Timeout . Infinite ) ;
cleanTimer . Dispose ( ) ;
cleanTimer = null ;
}
log . Info ( "backup cleaner service stopped" ) ;
isStarted = false ;
}
}
private void DeleteExpiredBackups ( )
{
if ( Monitor . TryEnter ( cleanerLock ) )
{
try
{
log . Debug ( "started to clean expired backups" ) ;
var backupRepository = backupStorageFactory . GetBackupRepository ( ) ;
var backupsToRemove = backupRepository . GetExpiredBackupRecords ( ) ;
log . DebugFormat ( "found {0} backups which are expired" , backupsToRemove . Count ) ;
if ( ! isStarted ) return ;
foreach ( var scheduledBackups in backupRepository . GetScheduledBackupRecords ( ) . GroupBy ( r = > r . TenantId ) )
{
if ( ! isStarted ) return ;
var schedule = backupRepository . GetBackupSchedule ( scheduledBackups . Key ) ;
if ( schedule ! = null )
{
var scheduledBackupsToRemove = scheduledBackups . OrderByDescending ( r = > r . CreatedOn ) . Skip ( schedule . BackupsStored ) . ToList ( ) ;
if ( scheduledBackupsToRemove . Any ( ) )
{
log . DebugFormat ( "only last {0} scheduled backup records are to keep for tenant {1} so {2} records must be removed" , schedule . BackupsStored , schedule . TenantId , scheduledBackupsToRemove . Count ) ;
backupsToRemove . AddRange ( scheduledBackupsToRemove ) ;
}
}
else
{
backupsToRemove . AddRange ( scheduledBackups ) ;
}
}
foreach ( var backupRecord in backupsToRemove )
{
if ( ! isStarted ) return ;
try
{
var backupStorage = backupStorageFactory . GetBackupStorage ( backupRecord ) ;
if ( backupStorage = = null ) continue ;
backupStorage . Delete ( backupRecord . StoragePath ) ;
backupRepository . DeleteBackupRecord ( backupRecord . Id ) ;
}
catch ( Exception error )
{
log . Warn ( "can't remove backup record: {0}" , error ) ;
}
}
}
catch ( Exception error )
{
log . Error ( "error while cleaning expired backup records: {0}" , error ) ;
}
finally
{
Monitor . Exit ( cleanerLock ) ;
}
}
}
}
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public static class BackupCleanerServiceExtension
{
public static DIHelper AddBackupCleanerService ( this DIHelper services )
{
services . TryAddScoped < BackupCleanerService > ( ) ;
return services ;
}
}
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}