MassTransit JobConsumer示例由于超时异常而失败

如何解决MassTransit JobConsumer示例由于超时异常而失败

MassTransit到7.0.4。我遇到了一个异常，尝试按以下说明演示最基本的Job Consumer场景：https://masstransit-project.com/advanced/job-consumers.html。异常消息是：

Timeout waiting for response,RequestId: 4ec50000-294e-000c-71b6-08d8768d0bc0

我怀疑该示例可能缺少导体配置。

我有3个项目的解决方案。 Project TestJob拥有ConvertVideo接口，可在客户端和使用者之间共享：

namespace JobSystem.Jobs
{
    using System;

    public interface ConvertVideo
    {
        Guid VideoId { get; }
        string Format { get; }
    }
}

项目TestJobClient具有单个类Program。对GetResponse的调用中出现了异常。

namespace JobSystemClient
{
    using System;
    using System.Threading;
    using System.Threading.Tasks;
    using JobSystem.Jobs;
    using MassTransit;
    using MassTransit.Contracts.JobService;

    public class Program
    {
        public static async Task Main()
        {
            var busControl = Bus.Factory.CreateUsingRabbitMq(cfg => 
            {
                // Not in sample,I added this
                cfg.Host("localhost");
            });

            var source = new CancellationTokenSource(TimeSpan.FromSeconds(30));

            await busControl.StartAsync(source.Token);
            try
            {
                var serviceClient = busControl.CreateServiceClient();

                var requestClient = serviceClient.CreateRequestClient<ConvertVideo>();

                do
                {
                    string value = await Task.Run(() =>
                    {
                        Console.WriteLine("Enter video format (or quit to exit)");
                        Console.Write("> ");
                        return Console.ReadLine();
                    });

                    if ("quit".Equals(value,StringComparison.OrdinalIgnoreCase))
                        break;

                    // Exception comes up here!
                    var response = await requestClient.GetResponse<JobSubmissionAccepted>(new
                    {
                        VideoId = NewId.NextGuid(),Format = value
                    });
                }
                while (true);
            }
            finally
            {
                await busControl.StopAsync();
            }
        }
    }
}

项目TestJobConsumer具有两个类，即Program和ConvertVideoJobConsumer。我在这里添加了一些代码来启动总线，并确保它保持活动状态以处理请求。

namespace JobSystemConsoleService
{
    using System;
    using System.Threading.Tasks;
    using JobSystem.Jobs;
    using MassTransit;
    using MassTransit.Conductor;
    using MassTransit.JobService;

    public class Program
    {
        public static async Task Main()
        {
            var busControl = Bus.Factory.CreateUsingRabbitMq(cfg =>
            {
                // Not in sample,I added this
                cfg.Host("localhost");

                var options = new ServiceInstanceOptions()
                    .EnableInstanceEndpoint();

                cfg.ServiceInstance(options,instance =>
                {
                    instance.ConfigureJobServiceEndpoints();

                    var queueName = instance.EndpointNameFormatter.Consumer<ConvertVideoJobConsumer>();

                    instance.ReceiveEndpoint(queueName,e =>
                    {
                        e.Consumer(() => new ConvertVideoJobConsumer(),c =>
                        {
                            // Note: edited this line from options to opts,as 
                            // the example has a compile-time error due to options 
                            // in already existing one of the parent scopes
                            c.Options<JobOptions<ConvertVideo>>(opts => opts
                                .SetJobTimeout(TimeSpan.FromMinutes(15))
                                .SetConcurrentJobLimit(10));
                        });
                    });
                });
            });

            await busControl.StartAsync();

            Console.WriteLine("Hit <Enter> to quit.");
            Console.Write("> ");
            Console.ReadLine();

            await busControl.StopAsync();
        }

        public class ConvertVideoJobConsumer :
            IJobConsumer<ConvertVideo>
        {
            public async Task Run(JobContext<ConvertVideo> context)
            {
                // simulate converting the video
                await Task.Delay(TimeSpan.FromSeconds(5));
            }
        }
    }
}