private void TimerCallback(bool fullBackup)
{
if (currentTask != null)
return;
// we have shared lock for both incremental and full backup.
lock (this)
{
if (currentTask != null)
return;
currentTask = Task.Factory.StartNew(async () =>
{
var documentDatabase = Database;
if (documentDatabase == null)
return;
using (LogContext.WithDatabase(documentDatabase.Name))
{
try
{
var dataDumper = new DataDumper(documentDatabase);
var localBackupConfigs = exportConfigs;
var localBackupStatus = exportStatus;
if (localBackupConfigs == null)
return;
if (fullBackup == false)
{
var currentEtags = dataDumper.FetchCurrentMaxEtags();
// No-op if nothing has changed
if (currentEtags.LastDocsEtag == localBackupStatus.LastDocsEtag &&
currentEtags.LastAttachmentsEtag == localBackupStatus.LastAttachmentsEtag &&
currentEtags.LastDocDeleteEtag == localBackupStatus.LastDocsDeletionEtag &&
currentEtags.LastAttachmentsDeleteEtag == localBackupStatus.LastAttachmentDeletionEtag)
{
return;
}
}
var backupPath = localBackupConfigs.LocalFolderName ??
Path.Combine(documentDatabase.Configuration.DataDirectory, "PeriodicExport-Temp");
if (fullBackup)
{
// create filename for full dump
backupPath = Path.Combine(backupPath, SystemTime.UtcNow.ToString("yyyy-MM-dd-HH-mm", CultureInfo.InvariantCulture) + ".ravendb-full-dump");
if (File.Exists(backupPath))
{
var counter = 1;
while (true)
{
backupPath = Path.Combine(Path.GetDirectoryName(backupPath), SystemTime.UtcNow.ToString("yyyy-MM-dd-HH-mm", CultureInfo.InvariantCulture) + " - " + counter + ".ravendb-full-dump");
if (File.Exists(backupPath) == false)
break;
counter++;
}
}
}
var smugglerOptions = (fullBackup)
? new SmugglerOptions()
: new SmugglerOptions
{
StartDocsEtag = localBackupStatus.LastDocsEtag,
StartAttachmentsEtag = localBackupStatus.LastAttachmentsEtag,
StartDocsDeletionEtag = localBackupStatus.LastDocsDeletionEtag,
StartAttachmentsDeletionEtag = localBackupStatus.LastAttachmentDeletionEtag,
Incremental = true,
ExportDeletions = true
};
var exportResult = await dataDumper.ExportData(new SmugglerExportOptions { ToFile = backupPath }, smugglerOptions);
if (fullBackup == false)
{
// No-op if nothing has changed
if (exportResult.LastDocsEtag == localBackupStatus.LastDocsEtag &&
exportResult.LastAttachmentsEtag == localBackupStatus.LastAttachmentsEtag &&
exportResult.LastDocDeleteEtag == localBackupStatus.LastDocsDeletionEtag &&
exportResult.LastAttachmentsDeleteEtag == localBackupStatus.LastAttachmentDeletionEtag)
{
logger.Info(
"Periodic export returned prematurely, nothing has changed since last export");
return;
}
}
try
{
if (!localBackupConfigs.Disabled)
{
UploadToServer(exportResult.FilePath, localBackupConfigs, fullBackup);
}
}
finally
{
// if user did not specify local folder we delete temporary file.
if (String.IsNullOrEmpty(localBackupConfigs.LocalFolderName))
{
IOExtensions.DeleteFile(exportResult.FilePath);
}
}
if (fullBackup)
{
localBackupStatus.LastFullBackup = SystemTime.UtcNow;
}
else
{
localBackupStatus.LastAttachmentsEtag = exportResult.LastAttachmentsEtag;
localBackupStatus.LastDocsEtag = exportResult.LastDocsEtag;
localBackupStatus.LastDocsDeletionEtag = exportResult.LastDocDeleteEtag;
localBackupStatus.LastAttachmentDeletionEtag = exportResult.LastAttachmentsDeleteEtag;
localBackupStatus.LastBackup = SystemTime.UtcNow;
}
var ravenJObject = JsonExtensions.ToJObject(localBackupStatus);
ravenJObject.Remove("Id");
var putResult = documentDatabase.Documents.Put(PeriodicExportStatus.RavenDocumentKey, null, ravenJObject,
new RavenJObject(), null);
// this result in exportStatus being refreshed
localBackupStatus = exportStatus;
if (localBackupStatus != null)
{
if (localBackupStatus.LastDocsEtag.IncrementBy(1) == putResult.ETag) // the last etag is with just us
localBackupStatus.LastDocsEtag = putResult.ETag; // so we can skip it for the next time
}
}
catch (ObjectDisposedException)
{
// shutting down, probably
}
catch (Exception e)
{
logger.ErrorException("Error when performing periodic export", e);
Database.AddAlert(new Alert
{
AlertLevel = AlertLevel.Error,
CreatedAt = SystemTime.UtcNow,
Message = e.Message,
Title = "Error in Periodic Export",
Exception = e.ToString(),
UniqueKey = "Periodic Export Error",
});
}
}
})
.Unwrap();
currentTask.ContinueWith(_ =>
{
currentTask = null;
});
}
}