/// <summary>
/// Writes the input stream to the destination using the writeAction.
/// If the destinationfile exists it will be overwritten.
/// </summary>
/// <param name="inputStream">The input stream.</param>
/// <param name="writeAction">The write action between the two streams.</param>
/// <param name="destinationFileName">The destination file name.</param>
/// <param name="destinationContentType">The destination content type.</param>
/// <param name="token">A token to cancel the operation.</param>
/// <returns></returns>
public async Task WriteAsync(Stream inputStream, Action <Stream, Stream> writeAction, string destinationFileName, ContentType destinationContentType, CancellationToken token)
{
if (token.IsCancellationRequested)
{
return;
}
var blob = _cloudBlobContainer.GetBlockBlobReference(destinationFileName);
blob.Properties.ContentType = GetContentType(destinationContentType);
var resultStream = await blob.OpenWriteAsync();
if (destinationContentType == ContentType.GZip)
{
using (var resultGzipStream = new GZipOutputStream(resultStream))
{
resultGzipStream.IsStreamOwner = false;
writeAction(inputStream, resultGzipStream);
await resultGzipStream.FlushAsync();
}
}
else
{
writeAction(inputStream, resultStream);
}
resultStream.Commit();
}
/// <summary>
/// Writes the input stream to the destination using the writeAction.
/// If the destinationfile exists it will be overwritten.
/// </summary>
/// <param name="inputStream">The input stream.</param>
/// <param name="writeAction">The write action between the two streams.</param>
/// <param name="destinationFileName">The destination file name.</param>
/// <param name="destinationContentType">The destination content type.</param>
/// <param name="token">A token to cancel the operation.</param>
/// <returns>Returns true if the action to write the destination file was successful. If the destination file was already present, the operationResult will be false.
/// If an Exception is thrown the exception will be stored under <see cref="AsyncOperationResult.OperationException"/>.
/// </returns>
public async Task <AsyncOperationResult> TryWriteAsync(Stream inputStream, Action <Stream, Stream> writeAction, string destinationFileName, ContentType destinationContentType, CancellationToken token)
{
_logger.LogInformation("WriteAsync: Start to write to {DestinationFileName}. ContentType is {ContentType}.",
$"{_cloudBlobContainer.StorageUri}{_cloudBlobContainer.Name}{destinationFileName}",
destinationContentType);
if (token.IsCancellationRequested)
{
_logger.LogInformation("WriteAsync: The operation was cancelled. DestinationFileName {DestinationFileName}", destinationFileName);
return(new AsyncOperationResult(false, new OperationCanceledException(token)));
}
try
{
var blob = _cloudBlobContainer.GetBlockBlobReference(destinationFileName);
blob.Properties.ContentType = GetContentType(destinationContentType);
// If the blob was written already to the destination do not do anything.
// This should not happen if the renew task was correctly scheduled. Add the check just in case that the renew task was not scheduled in time and a different process already processed the file.
if (!(await blob.ExistsAsync()))
{
// Do not use using to not automatically commit on dispose
// https://github.com/Azure/azure-storage-net/issues/832
var resultStream = await blob.OpenWriteAsync();
if (destinationContentType == ContentType.GZip)
{
using (var resultGzipStream = new GZipOutputStream(resultStream))
{
resultGzipStream.IsStreamOwner = false;
writeAction(inputStream, resultGzipStream);
await resultGzipStream.FlushAsync();
}
}
else
{
writeAction(inputStream, resultStream);
}
if (!(await blob.ExistsAsync()))
{
resultStream.Commit();
_logger.LogInformation("WriteAsync: End write to {DestinationFileName}", destinationFileName);
return(new AsyncOperationResult(true, null));
}
}
_logger.LogInformation("WriteAsync: The destination file {DestinationFileName}, was already present.", destinationFileName);
return(new AsyncOperationResult(false, null));
}
catch (Exception exception)
{
_logger.LogCritical(LogEvents.FailedBlobUpload, exception, "WriteAsync: The destination file {DestinationFileName}, failed to be written.", destinationFileName);
return(new AsyncOperationResult(null, exception));
}
}
