How to set ShutdownTimeout using HostBuilder Generic Host ref StopAsync OperationCanceledException

Question

Looking into the source code, the default Timeout for StopAsync is 5 seconds. WebHostBuilder provides an extension method UseShutdownTimeout for easy setting. But no such equivalent exists for HostBuilder.

I know I'm probably abusing the intent of HostBuilder by wanting more than 5 second timeout, but it's a nice framework for managing a collection of interdependent jobs.

I'd really appreciate some guidance on how to do with HostBuilder what UseShutdownTimeout does for WebHostBuilder whilst still working with official NuGet packages. I had a look at maybe extending HostingAbstractionsHostBuilderExtensions but it's a static class...

Sample console app below for triggering the StopAsync OperationCanceledException event. Simply Ctrl+C before 10 seconds are up.

using System;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace StackOverflow_GenericHost_StopAsync
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var host = new HostBuilder()                
                .ConfigureServices((hostContext, services) =>
                {
                    services.AddSingleton<IHostedService, MustRunToCompletionService>();
                })

                .Build();


            await host.StartAsync();

            try
            {
                await host.WaitForShutdownAsync();
            }
            catch (OperationCanceledException ex)
            {
                // We have completed a controlled shutdown but the Exception is ugly
                Console.WriteLine(ex);
                Console.ReadKey();
            }

            // just hangs if we don't
            host.Dispose();

        }
    }

    class MustRunToCompletionService : IHostedService 
    {
        private Task _longRunningTask;

        private async Task MustCompleteProcess()
        {
            // simulate long running job
            Thread.Sleep(15000);
        }

        public Task StartAsync(CancellationToken cancellationToken)
        {
            _longRunningTask = Task.Run(MustCompleteProcess);
            return Task.CompletedTask;
        }

        public Task StopAsync(CancellationToken cancellationToken)
        {
            // ignore cancellationToken, I really need this to run to completion
            return Task.WhenAll(_longRunningTask);
        }

    }

}

Answer 1

I gleaned the answer thanks to this post about SuppressStatusMessages

.ConfigureServices((hostContext, services) =>
    {
    services.Configure<HostOptions>(o => o.ShutdownTimeout = TimeSpan.FromSeconds(90));