ServerFactory.cs

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using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Server.Kestrel.Core;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;
using System.Threading;
using System.Threading.Tasks;
using Tgstation.Server.Host.Core;
using Tgstation.Server.Host.Extensions;
using Tgstation.Server.Host.IO;
using Tgstation.Server.Host.Setup;
using Tgstation.Server.Host.System;

namespace Tgstation.Server.Host
{
    sealed class ServerFactory : IServerFactory
    {
        readonly IAssemblyInformationProvider assemblyInformationProvider;

        public IIOManager IOManager { get; }

        internal ServerFactory(IAssemblyInformationProvider assemblyInformationProvider, IIOManager ioManager)
        {
            this.assemblyInformationProvider = assemblyInformationProvider ?? throw new ArgumentNullException(nameof(assemblyInformationProvider));
            IOManager = ioManager ?? throw new ArgumentNullException(nameof(ioManager));
        }

        public async Task<IServer> CreateServer(string[] args, string updatePath, CancellationToken cancellationToken)
        {
            if (args == null)
                throw new ArgumentNullException(nameof(args));

            IHostBuilder CreateDefaultBuilder() => Microsoft.Extensions.Hosting.Host.CreateDefaultBuilder(args)
                .ConfigureAppConfiguration((context, configuration) => configuration
                    .SetBasePath(
                        IOManager.ResolvePath()));

            var setupWizardHostBuilder = CreateDefaultBuilder()
                .UseSetupApplication();

            IPostSetupServices postSetupServices;
            using (var setupHost = setupWizardHostBuilder.Build())
            {
                postSetupServices = setupHost.Services.GetRequiredService<IPostSetupServices>();
                await setupHost.RunAsync(cancellationToken).ConfigureAwait(false);
            }

            var hostBuilder = CreateDefaultBuilder()
                .ConfigureWebHost(webHostBuilder =>
                    webHostBuilder
                        .UseKestrel(kestrelOptions =>
                        {
                            var serverPortProvider = kestrelOptions.ApplicationServices.GetRequiredService<IServerPortProvider>();
                            kestrelOptions.ListenAnyIP(
                                serverPortProvider.HttpApiPort,
                                listenOptions => listenOptions.Protocols = HttpProtocols.Http1AndHttp2);
                        })
                        .UseIIS()
                        .UseIISIntegration()
                        .UseApplication(postSetupServices)
                        .SuppressStatusMessages(true)
                        .UseShutdownTimeout(TimeSpan.FromMinutes(1)));

            if (updatePath != null)
                hostBuilder.UseContentRoot(
                    IOManager.ResolvePath(
                        IOManager.GetDirectoryName(assemblyInformationProvider.Path)));

            return new Server(hostBuilder, updatePath);
        }
    }
}