src/Services/Identity/Identity.API/Program.cs

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string Namespace = typeof(Startup).Namespace;
string AppName = Namespace.Substring(Namespace.LastIndexOf('.', Namespace.LastIndexOf('.') - 1) + 1);

var configuration = GetConfiguration();

Log.Logger = CreateSerilogLogger(configuration);

try
{
    Log.Information("Configuring web host ({ApplicationContext})...", AppName);
    var host = BuildWebHost(configuration, args);

    Log.Information("Applying migrations ({ApplicationContext})...", AppName);
    host.MigrateDbContext<PersistedGrantDbContext>((_, __) => { })
        .MigrateDbContext<ApplicationDbContext>((context, services) =>
        {
            var env = services.GetService<IWebHostEnvironment>();
            var logger = services.GetService<ILogger<ApplicationDbContextSeed>>();
            var settings = services.GetService<IOptions<AppSettings>>();

            new ApplicationDbContextSeed()
                .SeedAsync(context, env, logger, settings)
                .Wait();
        })
        .MigrateDbContext<ConfigurationDbContext>((context, services) =>
        {
            new ConfigurationDbContextSeed()
                .SeedAsync(context, configuration)
                .Wait();
        });

    Log.Information("Starting web host ({ApplicationContext})...", AppName);
    host.Run();

    return 0;
}
catch (Exception ex)
{
    Log.Fatal(ex, "Program terminated unexpectedly ({ApplicationContext})!", AppName);
    return 1;
}
finally
{
    Log.CloseAndFlush();
}

IWebHost BuildWebHost(IConfiguration configuration, string[] args) =>
    WebHost.CreateDefaultBuilder(args)
        .CaptureStartupErrors(false)
        .ConfigureAppConfiguration(x => x.AddConfiguration(configuration))
        .UseStartup<Startup>()
        .UseContentRoot(Directory.GetCurrentDirectory())
        .UseSerilog()
        .Build();

Serilog.ILogger CreateSerilogLogger(IConfiguration configuration)
{
    var seqServerUrl = configuration["Serilog:SeqServerUrl"];
    var logstashUrl = configuration["Serilog:LogstashgUrl"];
    return new LoggerConfiguration()