Sample showing how to use scoped filters with MassTransit and ASP.NET Core
MassTransit supports scoped filters, allowing access to the same container scope as consumers as well as message producers, like those within ASP.NET controllers, etc.
This sample shows how to manage a scoped class, Token, and use it to pass values between an ASP.NET controller action and MassTransit send/publish middleware filters.
Simply open it up and run it, and add a header to the request (using Postman, CURL, whatever) called "Token" with any string value to get a response.
I have issue with Consume Filter - it seems it's getting executed after IConsumer instance is created.
In my case I want to take message header ("User-Guid" in the example below) and inject it into scoped service (IAuthContextContainer with UserContext property) and then inject IAuthContextContainer into consumer class.
The problem is that I have also some more complex DI related to AuthContextContainer which internally uses IServiceProvider.GetRequiredService<>() (in consumer constructor scope, not in any method). In this case it throws error because ConsumeFilter haven't been executed yet (see output below).
Is is by design? Is there any workaround?
Consumer filter:
public class AuthContextConsumeFilter<T> :
IFilter<ConsumeContext<T>>
where T : class
{
readonly IAuthContextContainer _authContextContainer;
public AuthContextConsumeFilter(IAuthContextContainer authContextContainer)
{
_authContextContainer = authContextContainer;
}
public Task Send(ConsumeContext<T> context, IPipe<ConsumeContext<T>> next)
{
var userGuidStr = context.Headers.Get<string>("User-Guid");
if (!string.IsNullOrWhiteSpace(userGuidStr))
{
_authContextContainer.UserContext = new UserContext(Guid.Parse(userGuidStr));
}
Console.WriteLine("AuthContextConsumerFilter executed");
return next.Send(context);
}
public void Probe(ProbeContext context)
{
}
}Consumer:
public class CommandService
: IConsumer<MyPayload>
{
readonly IAuthContextContainer _authContextContainer;
protected CommandService(IAuthContextContainer authContextContainer;)
{
_authContextContainer = authContextContainer;
Console.WriteLine($"AuthContextConsumer::Ctor {_authContextContainer.UserContext}");
}
public async Task Consume(ConsumeContext<MyPayload> consumeContext)
{
Console.WriteLine($"AuthContextConsumer::Consume {_authContextContainer.UserContext}");
}Output:
AuthContextConsumer::Ctor // <= no UserContext here
AuthContextConsumerFilter executed // <= executed after consumer constructor
AuthContextConsumer::Consume Airstrike.Backend.Common.Application.Authentication.UserContext // user context is injected here
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