private static string GetBlobName(UploadFileProperties uploadFileProperties)
{
var fileName = uploadFileProperties.FileName;
if (!uploadFileProperties.EnforceNameUniqueness)
{
if (string.IsNullOrEmpty(fileName))
{
throw new ArgumentException("File name should be set");
}
return(fileName);
}
try
{
if (!string.IsNullOrEmpty(fileName))
{
// ReSharper disable once ReturnValueOfPureMethodIsNotUsed
Path.GetFileName(fileName);
}
}
catch (Exception)
{
throw new ArgumentException("Invalid file name for upload");
}
return($"{Guid.NewGuid().ToString().ToLower()}_{fileName}");
}
public async Task <string> UploadAsync(string containerName, UploadFileProperties uploadFileProperties, Stream streamToUpload)
{
var containerReference = GetBlobContainer(containerName);
var blobName = GetBlobName(uploadFileProperties);
var blobReference = containerReference.GetBlockBlobReference(blobName);
blobReference.Metadata.Add(FileNameMetadata, uploadFileProperties.FileName);
blobReference.Properties.ContentType = uploadFileProperties.ContentType;
blobReference.Properties.ContentDisposition = uploadFileProperties.ContentDisposition;
Func <Task <string> > uploadDelegate = async() =>
{
await blobReference.UploadFromStreamAsync(streamToUpload);
#if NET452
Log.Information("File {FileId} was uploaded to the storage", blobName);
#endif
#if NETSTANDARD2_0
logger.LogInformation("File {FileId} was uploaded to the storage", blobName);
#endif
return(blobName);
};
try
{
// try to upload file assuming container exists
return(await uploadDelegate());
}
catch (StorageException e)
{
// case when container was not created yet
if (e.RequestInformation.HttpStatusCode == 404)
{
#if NET452
Log.Warning(e, "Exception while uploading a file");
#endif
#if NETSTANDARD2_0
logger.LogWarning(e, "Exception while uploading a file");
#endif
await EnsureContainerExists(containerReference);
return(await uploadDelegate());
}
#if NET452
Log.Error(e, "Failed to upload a file to the storage");
#endif
#if NETSTANDARD2_0
logger.LogError(e, "Failed to upload a file to the storage");
#endif
throw;
}
}
public async Task <FileStorageWriteStream> GetWriteStreamAsync(string containerName, UploadFileProperties uploadFileProperties)
{
var containerReference = GetBlobContainer(containerName);
var blobName = GetBlobName(uploadFileProperties);
var blobReference = containerReference.GetBlockBlobReference(blobName);
blobReference.Metadata.Add(FileNameMetadata, uploadFileProperties.FileName);
blobReference.Properties.ContentType = uploadFileProperties.ContentType;
blobReference.Properties.ContentDisposition = uploadFileProperties.ContentDisposition;
Func <Task <FileStorageWriteStream> > openStreamDelegate = async() =>
{
var stream = await blobReference.OpenWriteAsync();
#if NET452
Log.Information("File {FileId} write stream to the storage was opened", blobName);
#endif
#if NETSTANDARD2_0
logger.LogInformation("File {FileId} write stream to the storage was opened", blobName);
#endif
return(new FileStorageWriteStream {
Id = blobName, Stream = stream
});
};
try
{
// try to open stream assuming container exists
return(await openStreamDelegate());
}
catch (StorageException e)
{
// case when container was not created yet
if (e.RequestInformation.HttpStatusCode == 404)
{
#if NET452
Log.Warning(e, "Exception while opening a write stream to the storage");
#endif
#if NETSTANDARD2_0
logger.LogWarning(e, "Exception while opening a write stream to the storage");
#endif
await EnsureContainerExists(containerReference);
return(await openStreamDelegate());
}
#if NET452
Log.Error(e, "Failed to open a write stream to the storage");
#endif
#if NETSTANDARD2_0
logger.LogError(e, "Failed to open a write stream to the storage");
#endif
throw;
}
}