HostingModule.cs

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Nerosoft.Euonia.Modularity;

namespace Nerosoft.Euonia.Hosting;

/// <summary>
/// The HostingModule class contains methods used to configure the hosting environment.
/// </summary>
public class HostingModule : ModuleContextBase
{
	/// <inheritdoc />
	public override void ConfigureServices(ServiceConfigurationContext context)
	{
		context.Services.TryAddScoped<RequestContextAccessor>(_ => GetRequestContext);
		context.Services.AddSerilog();
		context.Services.AddScopeTransformation();
		context.Services.AddUserPrincipal();
		context.Services.AddObjectAccessor<IApplicationBuilder>();
		context.Services.AddTransient<ExceptionHandlingMiddleware>();

		static RequestContext GetRequestContext(IServiceProvider provider)
		{
			var context = provider.GetService<IHttpContextAccessor>()?.HttpContext;
			if (context == null)
			{
				return null;
			}

			return new RequestContext
			{
				RequestHeaders = context.Request
				                        .Headers
				                        .ToDictionary(t => t.Key, t => t.Value.ToString()),
				ConnectionId = context.Connection.Id,
				User = context.User,
				RemotePort = context.Connection.RemotePort,
				RemoteIpAddress = context.Connection.RemoteIpAddress,
				RequestAborted = context.RequestAborted,
				IsWebSocketRequest = context.WebSockets.IsWebSocketRequest, 
				TraceIdentifier = context.TraceIdentifier, 
				RequestServices = context.RequestServices
			};
		}
	}

	/// <inheritdoc />
	public override void OnApplicationInitialization(ApplicationInitializationContext context)
	{
		base.OnApplicationInitialization(context);
		var app = context.GetApplicationBuilder();
		app.UseMiddleware<RequestTraceMiddleware>();
		app.UseMiddleware<ExceptionHandlingMiddleware>();

		// Setup the ServiceProvider for IServiceAccessor.
		app.Use((httpContext, next) =>
		{
			var accessor = httpContext.RequestServices.GetService<IServiceAccessor>();
			if (accessor != null)
			{
				accessor.ServiceProvider = httpContext.RequestServices;
			}

			return next();
		});
	}
}