CleanArchitecture/CleanArchitecture.Domain/EventHandler/Fanout/FanoutEventHandler.cs

using System.Threading.Tasks;
using CleanArchitecture.Domain.Interfaces;
using CleanArchitecture.Shared.Events;
using MassTransit;

namespace CleanArchitecture.Domain.EventHandler.Fanout;

public sealed class FanoutEventHandler : IFanoutEventHandler
{
    private readonly IPublishEndpoint _massTransit;
    private readonly IUser _user;

    public FanoutEventHandler(
        IPublishEndpoint massTransit, IUser user)
    {
        _massTransit = massTransit;
        _user = user;
    }

    public async Task<T> HandleDomainEventAsync<T>(T @event) where T : DomainEvent
    {
        var fanoutDomainEvent =
            new FanoutDomainEvent(
                @event.AggregateId,
                @event,
                _user.GetUserId());
        
        await _massTransit.Publish(fanoutDomainEvent);
        await _massTransit.Publish(@event);

        return @event;
    }
}