Aspire4Wasm

An easy way to leverage RabbitMQ's Delayed Message Exchange Plugin in Aspire hosted applications using just one line of code. This allows you to use NServiceBus or MassTransit or the .NET messaging library of your choice with RabbitMQ and have the ability to delay delivery of messages. Don't need the source code? Just get the Nuget package: https://www.nuget.org/packages/Aspire4RabbitMQDelayedMessageExchange/

Problem statement

.NET Aspire supports the official Management Plugin for RabbitMQ, adding a web GUI for inspecting queues and exchanges of the popular message broker. However, it currently doesn't currently (as of early 2025) support adding the Delayed Message Exchange Plugin.

My little library Aspire4RabbitMQDelayedMessageExchange solves the problem by writing a docker file to a temporary location inside your AppHost for you and running it in Docker as part of your distributed application.

Quickstart

1. Install Aspire4RabbitMQDelayedMessageExchange in your AppHost project via the Nuget package.
2. In your AppHost project's Program.cs file, after your call to AddRabbitMQ chain a call to WithDelayedDeliveryPlugin.
3. There is no 3. You are done! You can now use delayed message exchanges as directed by your messaging library (e.g. MassTransit, NServiceBus etc.)

Example Program.cs in AppHost

var builder = DistributedApplication.CreateBuilder(args); var rabbitMQ = builder.AddRabbitMQ(AspireResourceNames.MessageBroker.ConnectionName) .WithDataVolume() .WithLifetime(ContainerLifetime.Persistent) .WithManagementPlugin() .WithDelayedMessageExchangePlugin();

Custom behaviours (optional)

You can pass a tag argument to the WithDelayedMessageExchangePlugin method if you like. This will force a particular version of the plugin to be installed (e.g. "3.0" or "4.0") rather than the default, which is "latest".

Troubleshooting

If I find and overcome any hurdles I'll mention them here, but it's early days. So far so good.