My Consumers fail to instantiate from Autofac due to the following:
Cannot resolve parameter 'Microsoft.Extensions.Logging.Logger
1[MyConsumer] logger' of constructor 'Void .ctor(MyService, Microsoft.Extensions.Logging.Logger1[MyConsumer])'.
The ILoggers resolve fine in every other class except the MassTransit Consumers; I believe it's an issue with LogContext.ConfigureCurrentLogContext(); and order of operations. Below is the code, edited for brevity:
ContainerBuilder builder = new ContainerBuilder(); // Autofac
builder.RegisterType<LoggerFactory>()
.As<ILoggerFactory>()
.SingleInstance();
builder.RegisterGeneric(typeof(Logger<>))
.As(typeof(ILogger<>))
.SingleInstance();
builder.RegisterAssemblyTypes() // load up all services, yada yada
// what to pass here? I'm inside an unbuilt Autofac Container at this point. There is no ILoggerFactory until the Container is built!
LogContext.ConfigureCurrentLogContext(); // configure MassTransit logging
builder.AddMassTransit(x =>
{
x.AddConsumers(Assembly.GetEntryAssembly());
x.AddBus(bus => MassTransit.Bus.Factory.CreateUsingRabbitMq(config =>
{
config.ConfigureEndpoints(bus); // wire-up consumers discovered by the AddConsumers() call above
}));
});
Container = builder.Build(); // now build the container
// add NLog
IServiceProvider serviceProvider = new AutofacServiceProvider(Container); // this requires a built Container!
ILoggerFactory loggerFactory = serviceProvider.GetRequiredService<ILoggerFactory>();
loggerFactory.AddNLog();
I should note that logging within MassTransit is actually working; I see all kind of debug output regarding the queues and messages. But the Consumer will not instantiate for whatever reason. If I try to manually Resolve<ILogger<MyConsumer>>() I'll get an ILogger but MassTransit seems to have trouble with it.
Edit: full error message via VS Output:
None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type 'MyConsumer' can be invoked with the available services and parameters:
Cannot resolve parameter 'Microsoft.Extensions.Logging.Logger 1[MyConsumer] logger' of constructor 'Void .ctor(MyService, Microsoft.Extensions.Logging.Logger`1[MyConsumer])'.*
Package versions:
Cannot resolve parameter
Microsoft.Extensions.Logging.Logger 1[MyConsumer] logger
This error message means that Autofac can't find a registered Logger<MyConsumer>. If you look at your registration you register ILogger<> and not Logger<>. You should change the dependency to the interface version in MyConsumer and autofac will find it.