MassTransit with AWS SQS - exception sending dynamic message - asp.net-core

Question

I'm using Masstransit with AWS SQS/SNS as a transport.
Now I'm stuck with a simple problem - adding CorrelationId to published message. Since I'm following recommendation to use interfaces as DTOs, so I can't use CorrelatedBy<Guid> interface and I decided to add __CorrelationId property to messages directly.
I'm using following wrapper to publish message:
public class MessageBus : IMessageBus
{
// ... omitted for brevity
public async Task Publish<T>(object message)
where T : class
{
await this.publishEndpoint.Publish<T>(this.CreateCorrelatedMessage(message));
}
private object CreateCorrelatedMessage(object message)
{
dynamic corellatedMessage = new ExpandoObject();
foreach (var property in message.GetType().GetProperties())
{
((IDictionary<string, object>)corellatedMessage).Add(property.Name, property.GetValue(message));
}
corellatedMessage.__CorrelationId = this.correlationIdProvider.CorrelationId;
return corellatedMessage;
}
}
And here is the usage:
await this.messageBus.Publish<ObtainRequestToken>(new
{
Social = SocialEnum.Twitter,
AppId = credentials.First(x => x.Name == "TwitterConsumerKey").Value,
AppSecret = credentials.First(x => x.Name == "TwitterConsumerSecret").Value,
ReturnUrl = returnUrl
});
This works well in console app with following bus registration:
var busControl = Bus.Factory.CreateUsingAmazonSqs(cfg =>
{
cfg.Host("eu-west-1", h =>
{
h.AccessKey("xxx");
h.SecretKey("xxx");
h.Scope($"Local", scopeTopics: true);
});
});
But is ASP.NET Core application with
services.AddMassTransit(cfg =>
{
cfg.UsingAmazonSqs((context, sqsCfg) =>
{
var amazonAccount = this.Configuration
.GetSection("AmazonAccount")
.Get<AmazonAccountConfig>();
sqsCfg.Host(amazonAccount.Region, h =>
{
h.AccessKey(amazonAccount.KeyId);
h.SecretKey(amazonAccount.SecretKey);
h.Scope(this.Environment.EnvironmentName, scopeTopics: true);
});
});
cfg.SetEndpointNameFormatter(new DefaultEndpointNameFormatter(this.Environment.EnvironmentName + "_", false));
});
services.AddMassTransitHostedService();
It fails on publish with Object reference not set to an instance of an object. and stacktrace
at MassTransit.Logging.EnabledDiagnosticSource.StartSendActivity[T](SendContext1 context, ValueTuple2[] tags)
at MassTransit.AmazonSqsTransport.Transport.TopicSendTransport.SendPipe1.<Send>d__5.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()
at GreenPipes.Agents.PipeContextSupervisor1.<GreenPipes-IPipeContextSource<TContext>-Send>d__7.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at GreenPipes.Agents.PipeContextSupervisor1.<GreenPipes-IPipeContextSource<TContext>-Send>d__7.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at GreenPipes.Agents.PipeContextSupervisor1.<GreenPipes-IPipeContextSource<TContext>-Send>d__7.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()
at MassTransit.Initializers.MessageInitializer2.<Send>d__9.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.ConfiguredTaskAwaitable.ConfiguredTaskAwaiter.GetResult()
at MassTransit.Transports.PublishEndpoint.<>c__DisplayClass18_01.<<PublishInternal>g__PublishAsync|0>d.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Dynamic.UpdateDelegates.UpdateAndExecuteVoid1[T0](CallSite site, T0 arg0)
at xxx.Main.Api.Messaging.MessageBus.<Publish>d__51.MoveNext() in D:\repo\projects\xxx\mainapi\xxx.Main.Api\Messaging\MessageBus.cs:line 34
StartSendActivity looks like simple diagnostics method and I can't fugure out, what can be failing there.

Answer 1

You can't send object or other types like that with MassTransit. Messages must be reference types.
Relevant Documentation