Azure Function: Service Bus input binding (not trigger)

Question

Is it possible to define an input binding for my azure function to connect to a Service Bus queue/topic?

I can imagine something similar to this syntax for storage queue but I can't make it work for Service Bus yet, and I don't see examples online.

I'm looking to get hold of an instance of QueueClient and/or QueueDescription class.

The use case for the function is to return queue size based on HTTP trigger and name in query parameter.

mathewc mathewc · Accepted Answer · 2017-02-24T16:43:57

No we don't currently support a NamespaceManager/QueueClient input binding like we do for Azure Queues. However, you can easily do this yourself using the ServiceBus SDK directly in your function, w/o having to pull in any additional packages. E.g.

#r "Microsoft.ServiceBus"

using System;
using Microsoft.Azure.WebJobs;
using Microsoft.ServiceBus;
using Microsoft.ServiceBus.Messaging;

public static void Run(string input, TraceWriter log)
{
    var connectionString = Environment.GetEnvironmentVariable("<connection>");
    var nsmgr = NamespaceManager.CreateFromConnectionString(connectionString);
    long count = nsmgr.GetQueue("myqueue").MessageCount;
    log.Info($"Message count {count}");
}

Regarding the doc not being entirely correct for storage queues, I had previously logged an issue here to address that. I've also logged a new issue here for us to expand our ServiceBus binding.

Azure Function: Service Bus input binding (not trigger)

2 Answers