azure - CloudPageBlob StartCopyAsync 失败，状态为 404

Question

我在尝试将 CloudPageBlob 复制到位于不同 Azure 订阅中的存储帐户时遇到了问题。由于某种原因，当我调用复制时，我不断收到 404 错误:

CloudBlobContainer destContainer;
CloudBlob sourceBlob;
string destBlobName;

var sourcePageBlob = sourceBlob as CloudPageBlob;
if (sourcePageBlob != null)
{
    var destBlob = destContainer.GetPageBlobReference(destBlobName);
    await destBlob.StartCopyAsync(sourcePageBlob, AccessCondition.GenerateIfExistsCondition(), AccessCondition.GenerateEmptyCondition(), new BlobRequestOptions(), new OperationContext());
    return destBlob;
}

调用返回{“远程服务器返回错误:(404)未找到。”}但是，如果我调用 sourcePageBlob.Exists() 它会返回 true。

Answer 1

拥有一个私有(private)源容器是问题所在。您需要获取一个共享访问 URI，该 URI 将允许目标存储帐户访问源存储帐户。这篇博文对此进行了解释:https://alexandrebrisebois.wordpress.com/2013/06/25/copy-blobs-with-startcopyfromblob-and-track-its-progression-using-copystate/

CloudBlobContainer destContainer;
CloudBlob sourceBlob;
string destBlobName;

var sharedAccessUri = GetShareAccessUri(sourceBlob);
var sourcePageBlob = sourceBlob as CloudPageBlob;
if (sourcePageBlob != null)
{
    var destBlob = destContainer.GetPageBlobReference(destBlobName);
    await destBlob.StartCopyAsync(new Uri(sharedAccessUri));
    return destBlob;
}

private string GetShareAccessUri(CloudBlob sourceBlob)
{
  int validMins = 300;
  var policy = new SharedAccessBlobPolicy
  {
    Permissions = SharedAccessBlobPermissions.Read,
    SharedAccessStartTime = null,
    SharedAccessExpiryTime = DateTimeOffset.Now.AddMinutes(validMins)
  };

  var sas = sourceBlob.GetSharedAccessSignature(policy);
  return sourceBlob.Uri.AbsoluteUri + sas;
}