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using ASC.Core.Common.Hosting ;
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namespace ASC.Data.Backup.Services ;
[Singletone]
internal sealed class BackupCleanerService : BackgroundService
{
private readonly ILog _logger ;
private readonly TimeSpan _backupCleanerPeriod ;
private readonly IServiceScopeFactory _scopeFactory ;
public BackupCleanerService (
ConfigurationExtension configuration ,
IOptionsMonitor < ILog > options ,
IServiceScopeFactory scopeFactory )
{
_scopeFactory = scopeFactory ;
_logger = options . CurrentValue ;
_backupCleanerPeriod = configuration . GetSetting < BackupSettings > ( "backup" ) . Cleaner . Period ;
}
protected override async Task ExecuteAsync ( CancellationToken stoppingToken )
{
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_logger . Debug ( "BackupCleanerService is starting." ) ;
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stoppingToken . Register ( ( ) = > _logger . Debug ( "#1 BackupCleanerService background task is stopping." ) ) ;
while ( ! stoppingToken . IsCancellationRequested )
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{
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_logger . Debug ( "BackupCleanerService background task is doing background work." ) ;
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await ExecuteBackupCleaner ( stoppingToken ) ;
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await Task . Delay ( _backupCleanerPeriod , stoppingToken ) ;
}
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_logger . Debug ( "BackupCleanerService background task is stopping." ) ;
}
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private async Task ExecuteBackupCleaner ( CancellationToken stoppingToken )
{
using var serviceScope = _scopeFactory . CreateScope ( ) ;
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var registerInstanceService = serviceScope . ServiceProvider . GetService < IRegisterInstanceManager < BackupSchedulerService > > ( ) ;
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if ( ! await registerInstanceService . IsActive ( RegisterInstanceWorkerService < BackupCleanerService > . InstanceId ) ) return ;
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var backupRepository = serviceScope . ServiceProvider . GetRequiredService < BackupRepository > ( ) ;
var backupStorageFactory = serviceScope . ServiceProvider . GetRequiredService < BackupStorageFactory > ( ) ;
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_logger . Debug ( "started to clean expired backups" ) ;
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var backupsToRemove = backupRepository . GetExpiredBackupRecords ( ) ;
_logger . DebugFormat ( "found {0} backups which are expired" , backupsToRemove . Count ) ;
foreach ( var scheduledBackups in backupRepository . GetScheduledBackupRecords ( ) . GroupBy ( r = > r . TenantId ) )
{
if ( stoppingToken . IsCancellationRequested ) return ;
var schedule = backupRepository . GetBackupSchedule ( scheduledBackups . Key ) ;
if ( schedule ! = null )
{
var scheduledBackupsToRemove = scheduledBackups . OrderByDescending ( r = > r . CreatedOn ) . Skip ( schedule . BackupsStored ) . ToList ( ) ;
if ( scheduledBackupsToRemove . Any ( ) )
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{
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_logger . 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 ) ;
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}
}
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else
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{
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backupsToRemove . AddRange ( scheduledBackups ) ;
}
}
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foreach ( var backupRecord in backupsToRemove )
{
if ( stoppingToken . IsCancellationRequested ) return ;
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try
{
var backupStorage = backupStorageFactory . GetBackupStorage ( backupRecord ) ;
if ( backupStorage = = null ) continue ;
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backupStorage . Delete ( backupRecord . StoragePath ) ;
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backupRepository . DeleteBackupRecord ( backupRecord . Id ) ;
}
catch ( ProviderInfoArgumentException error )
{
_logger . Warn ( "can't remove backup record " + backupRecord . Id , error ) ;
if ( DateTime . UtcNow > backupRecord . CreatedOn . AddMonths ( 6 ) )
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{
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backupRepository . DeleteBackupRecord ( backupRecord . Id ) ;
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}
}
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catch ( Exception error )
{
_logger . Warn ( "can't remove backup record: " + backupRecord . Id , error ) ;
}
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}
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}
}