/// <summary>
/// Sends the transfer payload to the target providers.
/// </summary>
/// <param name="file"></param>
/// <param name="source"></param>
/// <param name="payload"></param>
/// <param name="cancelToken"></param>
/// <returns></returns>
private async Task SendTransferPayloadToFileTargetsAsync(BackupFile file, SourceLocation source, TransferPayload payload, CancellationToken cancelToken)
{
var directory = await Database.GetDirectoryMapItemAsync(file.Directory).ConfigureAwait(false);
foreach (var providerName in payload.DestinationProviders)
{
var destination = Providers[providerName];
try
{
// upload this chunk to the destination cloud provider.
// note: the provider implementation will automatically handle retries of transient issues.
await destination.UploadFileBlockAsync(file, source, directory,
payload.Data, (int)payload.CurrentBlockNumber, (int)payload.TotalBlocks, cancelToken).ConfigureAwait(false);
// flag the chunk as sent in the file status.
file.SetBlockAsSent((int)payload.CurrentBlockNumber, providerName);
}
catch (OperationCanceledException)
{
// cancellation was requested.
// bubble up to the next level.
throw;
}
catch (Exception ex)
{
Logger.WriteTraceError("An error occurred during a file transfer.", ex, Logger.GenerateFullContextStackTrace(), InstanceID);
file.SetProviderToFailed(providerName);
// sets the error message/stack trace
await Database.SetBackupFileAsFailedAsync(file, ex.ToString()).ConfigureAwait(false);
await Database.RemoveFileFromBackupQueueAsync(file).ConfigureAwait(false);
}
finally
{
// commit the status changes to the local state database.
await Database.UpdateBackupFileCopyStateAsync(file).ConfigureAwait(false);
}
}
}