Support for managed identity w/o conn string?

[anyeone]

Hi,

I'm in the process of evaluating Rebus for our platform. I have several years of experience developing sagas with NServiceBus so am very familiar with the concepts.

Have you considered adding support for initializing the AzureServiceBusTransport with a managed identity + credential or a ServiceBusClientFactory method in addition to a connection string? As you probably are aware, the practice of using connection strings to connect to Azure resources is not ideal anymore and AzureServiceBus itself supports initializing a client from just a uri + a credential as such:

new ServiceBusClient(serviceBusClientUri, credential);

For example, here's how I register ASB with one of my applications in the DI container today:
` builder.Services.AddScoped(sb =>
{
if (sbConfig == null || string.IsNullOrEmpty(sbConfig.ServiceBusClientUri))
{
throw new ConfigurationErrorsException("Missing 'CleanupServiceConfiguration:*' settings from App Config.");
}

        var credential = new DefaultAzureCredential();
        return new ServiceBusClient(sbConfig.ServiceBusClientUri, credential);
    });`

It seems like it shouldn't be a huge stretch to overload the constructor for AzureServiceBusTransport to accept a ServiceBusClientFactory method that knows how to generate a credential, and then to have the Rebus framework use that ServiceBusClientFactory to get a client when necessary (we wouldn't want to initialize with a credential instance since it would of course eventually expire, hence the factory instead).

Is this something you'd be interested in doing or accepting a PR about? I don't want to commit to doing a PR just yet but if after evaluating Rebus we want to use it, we definitely would want to avoid having to use connection strings.

Thanks in advance!

[mookid8000]

Hi @anyeone , it's a really good suggestion, and yes a PR would be very welcome 🙂
I would be happy to help you on your way, so if you need any pointers, let me know. (though it looks like you already have a pretty good idea on how to do it)