Connect to Azure Service Bus using Managed Identity #10095

4 Answer(s)

• 

  0

  AI-Bot created one year ago

  Support Team ABP Agent

  1. Solution

  • Current behavior (ABP v9.3.3): Volo.Abp.AzureServiceBus’s ConnectionPool expects a connection string and throws when it’s missing. This prevents using Managed Identity out-of-the-box.

  • Workable approach today (non-breaking, recommended):

    1. Bypass the default ConnectionPool by registering your own ServiceBusClient that uses DefaultAzureCredential. This keeps ABP’s Distributed Event Bus on Azure Service Bus working while authenticating via Managed Identity.

    Example:

  using Azure.Core;
    using Azure.Identity;
    using Azure.Messaging.ServiceBus;
    using Microsoft.Extensions.Options;
    using Volo.Abp;
    using Volo.Abp.AzureServiceBus;
    using Volo.Abp.Modularity;
  
    [DependsOn(typeof(AbpAzureServiceBusModule))]
    public class MyAzureServiceBusMiModule : AbpModule
    {
        public override void ConfigureServices(ServiceConfigurationContext context)
        {
            // Configure your namespace in options
            Configure<AbpAzureServiceBusOptions>(opt =>
            {
                opt.Namespace = "<your-namespace>"; // e.g. mybusns
                // You can still set TopicName/SubscriptionName if you use ABP’s distributed event bus
            });
  
            context.Services.AddSingleton<TokenCredential, DefaultAzureCredential>();
  
            // Replace ServiceBusClient registration to use MI instead of connection string
            context.Services.AddSingleton<ServiceBusClient>(sp =>
            {
                var options = sp.GetRequiredService<IOptions<AbpAzureServiceBusOptions>>().Value;
                var credential = sp.GetRequiredService<TokenCredential>();
  
                // Fully qualified namespace: "<namespace>.servicebus.windows.net"
                var fqn = $"{options.Namespace}.servicebus.windows.net";
                return new ServiceBusClient(fqn, credential);
            });
  
            // Optionally: if you use sender/processor factories relying on ConnectionPool,
            // you can replace IConnectionPool with your own implementation.
            context.Services.Replace(ServiceDescriptor.Singleton<IConnectionPool, ManagedIdentityConnectionPool>());
        }
    }
  
    // Example minimal pool that creates clients using MI when no connection string is present
    public class ManagedIdentityConnectionPool : IConnectionPool
    {
        private readonly ConcurrentDictionary<string, ServiceBusClient> _clients = new();
        private readonly TokenCredential _credential;
  
        public ManagedIdentityConnectionPool(TokenCredential credential)
        {
            _credential = credential;
        }
  
        public ServiceBusClient Get(string fullyQualifiedNamespace, string? connectionString = null)
        {
            // Prefer connection string when provided, otherwise use MI
            return _clients.GetOrAdd(fullyQualifiedNamespace, ns =>
            {
                if (!string.IsNullOrWhiteSpace(connectionString))
                {
                    return new ServiceBusClient(connectionString);
                }
                return new ServiceBusClient(ns, _credential);
            });
        }
    }
  

  Notes:

  • Ensure the managed identity (system-assigned or user-assigned) has at least Azure Service Bus Data Sender/Receiver roles on the namespace.

  • For ABP Distributed Event Bus, keep using AbpAzureServiceBusOptions for entity names (topic/subscription). Only authentication changes.

  • About adding a first-class configuration option in ABP:

    • Your suggestion is valid: introducing an option like AbpAzureServiceBusOptions.UseManagedIdentity = true or providing a credential factory would allow the framework to pick DefaultAzureCredential when no connection string is supplied.
    • Until such an enhancement is added, replacing the client or the connection pool as shown above is the supported customization pattern in ABP (use DI replace).

  2. Sources

  • Azure Service Bus client creation with DefaultAzureCredential (code you referenced):
    • ABP Azure Service Bus ConnectionPool (shows current connection-string-based design) https://github.com/abpframework/abp/blob/270c458fe426e831b0568e533e125c9321cb78b7/framework/src/Volo.Abp.AzureServiceBus/Volo/Abp/AzureServiceBus/ConnectionPool.cs#L14
  • Related ABP Support reference (Managed Identity usage context) https://abp.io/support/questions/9853/Connect-to-Azure-Redis-Cache-and-Azure-Service-Bus-using-Azure-managed-Identity

  ---

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  0

  neethucp created one year ago

  It would be better if we had a configuration option rather than overriding the connection pool.

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  0

  maliming created one year ago

  Support Team Fullstack Developer

  hi

  I will check and provide an option to override it.

  Thanks.

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  0

  maliming created one year ago

  Support Team Fullstack Developer

  https://github.com/abpframework/abp/pull/24152

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