public static string DownloadText(this BlobBaseClient blobClient, CancellationToken cancellationToken = default)
{
using BlobDownloadInfo blobDownloadInfo = blobClient.Download(cancellationToken);
using Stream stream = blobDownloadInfo.Content;
using StreamReader streamReader = new StreamReader(stream);
return(streamReader.ReadToEnd());
}
public T GetBlob <T>()
{
BlobDownloadInfo download = _blobClient.Download();
var stream = new MemoryStream();
download.Content.CopyTo(stream);
var bytes = stream.ToArray();
var stringObject = Encoding.UTF8.GetString(bytes);
return(JsonConvert.DeserializeObject <T>(stringObject));
}
public Response DownloadTo(
Stream destination,
BlobRequestConditions conditions,
CancellationToken cancellationToken)
{
// Wrap the download range calls in a Download span for distributed
// tracing
DiagnosticScope scope = _client.ClientDiagnostics.CreateScope($"{nameof(BlobBaseClient)}.{nameof(BlobBaseClient.DownloadTo)}");
try
{
scope.Start();
// Just start downloading using an initial range. If it's a
// small blob, we'll get the whole thing in one shot. If it's
// a large blob, we'll get its full size in Content-Range and
// can keep downloading it in segments.
var initialRange = new HttpRange(0, _initialRangeSize);
Response <BlobDownloadInfo> initialResponse = _client.Download(
initialRange,
conditions,
rangeGetContentHash: false,
cancellationToken);
// If the initial request returned no content (i.e., a 304),
// we'll pass that back to the user immediately
if (initialResponse.IsUnavailable())
{
return(initialResponse.GetRawResponse());
}
// Copy the first segment to the destination stream
CopyTo(initialResponse, destination, cancellationToken);
// If the first segment was the entire blob, we're finished now
long initialLength = initialResponse.Value.ContentLength;
long totalLength = ParseRangeTotalLength(initialResponse.Value.Details.ContentRange);
if (initialLength == totalLength)
{
return(initialResponse.GetRawResponse());
}
// Capture the etag from the first segment and construct
// conditions to ensure the blob doesn't change while we're
// downloading the remaining segments
ETag etag = initialResponse.Value.Details.ETag;
BlobRequestConditions conditionsWithEtag = CreateConditionsWithEtag(conditions, etag);
// Download each of the remaining ranges in the blob
foreach (HttpRange httpRange in GetRanges(initialLength, totalLength))
{
// Don't need to worry about 304s here because the ETag
// condition will turn into a 412 and throw a proper
// RequestFailedException
Response <BlobDownloadInfo> result = _client.Download(
httpRange,
conditionsWithEtag,
rangeGetContentHash: false,
cancellationToken);
CopyTo(result.Value, destination, cancellationToken);
}
return(initialResponse.GetRawResponse());
}
catch (Exception ex)
{
scope.Failed(ex);
throw;
}
finally
{
scope.Dispose();
}
}
