How to implement blob storage access timeout and show message - azure

Question

I want to show message to end user when blob is taking so much time for uploading and downloading. I found useful blog here.
Simply linear retry policy
public static RetryPolicy LinearRetry(int retryCount, TimeSpan intervalBetweenRetries)
{
return () =>
{
return (int currentRetryCount, Exception lastException, out TimeSpan retryInterval) =>
{
// Do custom work here
// Set backoff
retryInterval = intervalBetweenRetries;
// Decide if we should retry, return bool
return currentRetryCount < retryCount;
};
};
}
But here I didn't get how to send response to user back while retrying. Is this right way or anything else. Please suggest

Answer 1

OperationContext class in Storage Client Library has an event called Retrying that you can consume and send message back to the client.
For example, I created a simple console application which tries to create a blob container. When I ran this application, I deliberately turned off Internet access so that I can simulate a situation where operation would be retried. Then in this event consumer, I simply write something back to console. You could simply raise another event from there that would send a message back to your client.
var requestOptions = new BlobRequestOptions()
{
RetryPolicy = new ExponentialRetry(),
};
var operationContext = new OperationContext();
operationContext.Retrying += (sender, args) =>
{
Console.WriteLine("I'm retrying ....");
};
var cloudStorageAccount = new CloudStorageAccount(new StorageCredentials(accountName, accountKey), true);
var blobClient = cloudStorageAccount.CreateCloudBlobClient();
var container = blobClient.GetContainerReference("test");
container.CreateIfNotExists(requestOptions, operationContext);