natsdotnet/src/NATS.Server.Host/Program.cs

using NATS.Server;
using Serilog;

Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Debug()
    .Enrich.FromLogContext()
    .WriteTo.Console(outputTemplate: "[{Timestamp:HH:mm:ss} {Level:u3}] {Message:lj}{NewLine}{Exception}")
    .CreateLogger();

var options = new NatsOptions();

// Simple CLI argument parsing
for (int i = 0; i < args.Length; i++)
{
    switch (args[i])
    {
        case "-p" or "--port" when i + 1 < args.Length:
            options.Port = int.Parse(args[++i]);
            break;
        case "-a" or "--addr" when i + 1 < args.Length:
            options.Host = args[++i];
            break;
        case "-n" or "--name" when i + 1 < args.Length:
            options.ServerName = args[++i];
            break;
        case "-m" or "--http_port" when i + 1 < args.Length:
            options.MonitorPort = int.Parse(args[++i]);
            break;
        case "--http_base_path" when i + 1 < args.Length:
            options.MonitorBasePath = args[++i];
            break;
        case "--https_port" when i + 1 < args.Length:
            options.MonitorHttpsPort = int.Parse(args[++i]);
            break;
    }
}

using var loggerFactory = new Serilog.Extensions.Logging.SerilogLoggerFactory(Log.Logger);
var server = new NatsServer(options, loggerFactory);

var cts = new CancellationTokenSource();
Console.CancelKeyPress += (_, e) =>
{
    e.Cancel = true;
    cts.Cancel();
};

try
{
    await server.StartAsync(cts.Token);
}
catch (OperationCanceledException)
{
    Log.Information("Server shutdown requested");
}
finally
{
    Log.CloseAndFlush();
}