Checking if a queue exists

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I have a very basic question about Windows Azure Storage Queue errors/access.

I am trying to find out if the given storage account already contains a queue by the given name - say "queue1". I do not want to create the queue if it does not exist, and so am not keen on using the CreateIfNotExist method. The permissions I have given to the SAS token are - processing and Add (since all I want to do is to add a new message to the queue only if it already exists, and throw an error otherwise)

The problem is that when I try to get reference to a fake named queue, and add a message to it, I get a 403. 403 can also occur when the SAS token does not have permissions, so I cannot be sure what is causing the error.

Is there a way I could explicitly know if the queue exists or not?

I have tried the BeginExist, and EndExist methods but they always return false even when I can see the queue being there.

Any suggestions?

The Get Queue Metadata REST API operation will return status code 200 if the queue exists or a Queue Service Error Code otherwise.

Regarding to authorization,

This operation can be performed by the account owner and by anyone with a shared access signature that has permission to perform this operation.

A GET request to

https://myaccount.queue.core.windows.net/myqueue?comp=metadata

Will return a response like:

Response Status:
HTTP/1.1 200 OK

Response Headers:
Transfer-Encoding: chunked
x-ms-approximate-messages-count: 0
Date: Fri, 16 Sep 2011 01:27:38 GMT
Server: Windows-Azure-Queue/1.0 Microsoft-HTTPAPI/2.0

C#, Return Value: The function returns True if the element exists in the Queue and returns False if the element doesn't exist in the Queue. Queue accepts null as a valid value for reference types and allows duplicate elements. Syntax: public virtual bool Contains(object obj); Return Value: The function returns True if the element exists in the Queue and returns False if the element doesn’t exist in the Queue. Below given are some examples to understand the implementation in a

Are you sure you're getting a 403 error even if the queue does not exist. Based on what you described above, I created a simple console app. The queue does not exist in my storage account. When I try to add a message with valid SAS token, I get a 404 error:

    CloudStorageAccount storageAccount = new CloudStorageAccount(new StorageCredentials("account", "key"), false);
    CloudQueueClient client = storageAccount.CreateCloudQueueClient();
    CloudQueue queue = client.GetQueueReference("non-existent-queue");
    var queuePolicy = new SharedAccessQueuePolicy();
    var sas = queue.GetSharedAccessSignature(new SharedAccessQueuePolicy()
    {
        SharedAccessExpiryTime = DateTime.UtcNow.AddMinutes(30),
        Permissions = SharedAccessQueuePermissions.Add | SharedAccessQueuePermissions.ProcessMessages | SharedAccessQueuePermissions.Update
    }, null);
    StorageCredentials creds = new StorageCredentials(sas);
    var queue1 = new CloudQueue(queue.Uri, creds);
    try
    {
        queue1.AddMessage(new CloudQueueMessage("This is a test message"));
    }
    catch (StorageException excep)
    {
        //Get 404 error here
    }

Next, I made the SAS token invalid by setting it's expiry to 30 minutes before current time. Now when I run the application, I get 403 error as expected.

    CloudStorageAccount storageAccount = new CloudStorageAccount(new StorageCredentials("account", "key"), false);
    CloudQueueClient client = storageAccount.CreateCloudQueueClient();
    CloudQueue queue = client.GetQueueReference("non-existent-queue");
    var queuePolicy = new SharedAccessQueuePolicy();
    var sas = queue.GetSharedAccessSignature(new SharedAccessQueuePolicy()
    {
        SharedAccessExpiryTime = DateTime.UtcNow.AddMinutes(-30),//-30 to ensure SAS is invalid
        Permissions = SharedAccessQueuePermissions.Add | SharedAccessQueuePermissions.ProcessMessages | SharedAccessQueuePermissions.Update
    }, null);
    StorageCredentials creds = new StorageCredentials(sas);
    var queue1 = new CloudQueue(queue.Uri, creds);
    try
    {
        queue1.AddMessage(new CloudQueueMessage("This is a test message"));
    }
    catch (StorageException excep)
    {
        //Get 403 error here
    }

Check if remote queue exists, Exists(). It's a bit more complicated to check if a remote queue exists. In that case you will have to loop through the queues on the remote MSMQ� Checking if a queue exists. Ask Question Asked 6 years, 10 months ago. Active 2 months ago. Viewed 2k times 1. I have a very basic question about Windows Azure

Check if queue exists in Solace - solace - html, In case those queues are already exists I would like to avoid doing it again. Using Java API is it possible to check if particular queue exists and which topics are� (MQMSG_CLASS_NACK_BAD_DST_Q) Alternatively you could use negative source journaling and, on failure to deliver, should see the same class of NACK in the corresponding "Dead-letter messages" system queue. In summary, don't check if the queue exists but instead handle the non-delivery of the message should it turn out that the queue doesn't exist.

There is no Exists method in the v12 as well. Wrote a simple helper method to do the check:

        private async Task<bool> QueueExistsAsync(QueueClient queue)
        {
            try
            {
                await queue.GetPropertiesAsync();
                return true;
            }
            catch (RequestFailedException ex)
            {
                if (ex.Status == (int) HttpStatusCode.NotFound)
                {
                    return false;
                }

                throw;
            }
        }

Check if Queue Exists or Not, If there any way to avoid this and return something like null or throw and exception if a Queue for the supplied name does not exists? Sign in to reply. 6/14 /17� @Jakotheshadows, in OP's question, he isn't removing items from the queue, he is just iterating over what is in the queue. Which is a rather strange use of Queue, IMHO. (As titol comments, if you don't have a situation that needs Dequeue, then why are you using a queue?) – ToolmakerSteve Aug 27 '16 at 12:27

See if item exists in queue - Build, Contains() check if it were a collection or a Find() if it were an EF DbSet, but no equivalent seems to exist here. I can use the Get Queue Items� Well, both passive=true and passive=false will assert that the queue exists, but passive=true will fail rather than create the queue if it is missing. Since the OP is mostly concerned with making sure the basic.get works, then it makes more sense to declare the queue passive=false.

MessageQueue.Exists(String) Method (System.Messaging , The application used format name syntax when verifying queue existence. Examples. The following code example verifies whether a Message Queuing queue� A queue is a variable-size, ordered collection of homogeneous elements. like a dynamic array, queues can grow and shrink; queue supports adding and removing elements anywhere; Queues are declared using the same syntax as unpacked arrays, but specifying $ as the array size. In queue 0 represents the first, and $ representing the last entries.

Check queue is already exist or not in RabbitMQ?, If you create a queue in RabbitMQ using "queue.declare" method, then you doesn't need to check that queue is created or not. For more� Java program to check whether queue is empty. Youngster Point Empowering and Enlightening youth with 10 Point analysis, Inspiring Personalities, Editorials, C & Java Programs, Data Structures and Algorithms and IQ Test.