FarmMapsApiClient/FarmmapsApi/FarmmapsProgram.cs

using System.Net.Http;
using System.Threading.Tasks;
using FarmmapsApi.HttpMessageHandlers;
using FarmmapsApi.Models;
using FarmmapsApi.Services;
using IdentityModel.Client;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace FarmmapsApi
{
    public abstract class FarmmapsProgram<T> where T : class, IApplication
    {
        public async Task Start(string[] args)
        {
            IConfiguration config = new ConfigurationBuilder()
                .AddJsonFile("appsettings.json", false, true)
                .Build();

            var configuration = config.Get<Configuration>();

            var serviceCollection = new ServiceCollection()
                .AddSingleton(configuration)
                .AddSingleton<IDiscoveryCache>(sp =>
                {
                    var httpFactory = sp.GetRequiredService<IHttpClientFactory>();
                    return new DiscoveryCache(configuration.DiscoveryEndpointUrl,
                        () => httpFactory.CreateClient());
                })
                .AddSingleton<HttpClientSettings>()
                .AddSingleton<FarmmapsEventHub>()
                .AddSingleton<T>()
                .AddTransient<OpenIdConnectService>()
                .AddTransient<FarmmapsAuthenticationHandler>()
                .AddTransient<GeneralService>()
                .AddHttpClient<FarmmapsApiService>()
                .AddHttpMessageHandler<FarmmapsAuthenticationHandler>()
                .Services;
            

            Configure(serviceCollection);

            var serviceProvider = serviceCollection.BuildServiceProvider();
            await serviceProvider.GetService<FarmmapsApiService>().AuthenticateAsync();
//            await serviceProvider.GetService<FarmmapsEventHub>().StartEventHub();

            await serviceProvider.GetRequiredService<T>().RunAsync();
        }

        protected abstract void Configure(IServiceCollection serviceCollection);
    }
}