.net-core - MassTransit 请求/响应是否需要微服务架构中的通用 .dll？

Question

我将在 .Net Core 中实现我的应用程序，在请求/响应模式中使用 RabbitMQ 和 MassTransit。

这是接收者的代码（它接收用户名和密码，然后将用户名和提供者密钥发送给客户端）：

//BusConfiguration.cs

public static IBusControl ConfigureBus(
        Action<IRabbitMqBusFactoryConfigurator, IRabbitMqHost> registrationAction = null)
    {
        return Bus.Factory.CreateUsingRabbitMq(cfg =>
        {
            var host = cfg.Host(new Uri(RabbitMqConstants.RabbitMqUri), hst =>
            {
                hst.Username(RabbitMqConstants.UserName);
                hst.Password(RabbitMqConstants.Password);
            });

            registrationAction?.Invoke(cfg, host);
        });
    }

public void ConfigureBus()
    {
        bus = BusConfigurator.ConfigureBus((cfg, host) =>
        {
            cfg.ReceiveEndpoint(host, RabbitMqConstants.OAuth2ServiceQueue, e =>
            {
                e.Consumer<CreateUserCommandConsumer>();
            });
        });

        TaskUtil.Await(() => bus.StartAsync());
    }


//CreateUserCommandConsumer.cs
public class CreateUserCommandConsumer : IConsumer<ICreateUserCommand>
{
    public async Task Consume(ConsumeContext<ICreateUserCommand> context)
    {
        await context.RespondAsync<IUserCreatedEvent>(new
        {
            UserName = context.Message.UserName,
            ProviderKey = "q1w2e3d3r"

        });
    }
}

命令和事件类如下：

 //ICreateUserCommand.cs
namespace WebHost.My.ServiceBus.Messages
{
    public interface ICreateUserCommand
    {
        string UserName { get; set; }
        string Password { get; set; }
    }
}

//IUserCreatedEvent.cs
namespace WebHost.My.ServiceBus.Messages.CreateUser
{
    public interface IUserCreatedEvent
    {
        string UserName { get; set; }
        string ProviderKey { get; set; }
    }
}

这是我的客户的代码（发送用户创建请求）：

        var bus = BusConfigurator.ConfigureBus((cfg, host) =>
        {
            cfg.ReceiveEndpoint(host, "profile.test.service", e =>
            {
            });
        });

        TaskUtil.Await(() => bus.StartAsync());

        try
        {
            IRequestClient<ICreateUserCommand, IUserCreatedEvent> client = CreateRequestClient(bus);

            var userName = "username";
            var password = "password";

            Task.Run(async () =>
            {
                var response = await client.Request(new CreateUserCommand()
                {
                    UserName = userName,
                    Password = password
                });

                Console.WriteLine("User Provider key: {0}", response.ProviderKey);
                Console.WriteLine("User Username: {0}", response.UserName);
            }).Wait();
        }
        catch (Exception ex)
        {
            Console.WriteLine("Exception!!! OMG!!! {0}", ex);
        }
        finally
        {
            bus.Stop();
        }
    }
    static IRequestClient<ICreateUserCommand, IUserCreatedEvent> CreateRequestClient(IBusControl busControl)
    {
        var serviceAddress = new Uri(RabbitMqConstants.RabbitMqUri + RabbitMqConstants.OAuth2ServiceQueue);
        var client =
            busControl.CreateRequestClient<ICreateUserCommand, IUserCreatedEvent>(serviceAddress, TimeSpan.FromSeconds(60), TimeSpan.FromSeconds(60));

        return client;
    }

关键是双方（请求方和响应方）是不同的项目，没有共同的 .ddl。换句话说，它们不共享 IUserCreatedEvent 和 ICreateUserCommand 接口。在运行服务器代码（响应者）时，它会创建一个名为“WebHost.My.ServiceBus.Messages:ICreateUserCommand”的交换，它是命名空间和接口名称的组合。由于我的客户端代码中没有这样的命名空间，所以当响应者发送提供者密钥和用户名时，消息会发送到 _skipped 交换并且我无法获得响应。

据我搜索和理解，Command 和 Event 接口必须在两个项目（请求者和响应者）之间共享，但由于我正在编写基于 API 的项目，我不希望它们共享命名空间！如何克服 MassTransit 中的这种限制？

非常感谢

标签： .net-corerabbitmqmasstransit