Create a sample using Microsoft.AspNetCore.Hosting.WindowsServices

[stephenpope]

I am trying to get an RC2 web sample hosted as windows service up and running using Microsoft.AspNetCore.Hosting.WindowsServices ..

    public class Program
    {
        public static void Main(string[] args)
        {
            var host = new WebHostBuilder()
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseStartup<Startup>()
                .Build();

            host.RunAsService();
        }
    }

.. the RunAsService extension method says it blocks until the service is stopped but currently it seems to be running the Startup over and over again.
(I have a simple log message inside the Configure method). Not sure if this is a bug or I am doing something wrong.

If someone could create a working sample it would be really useful to check against.

[Tratcher]

Is it crashing and auto-restarting?

[stephenpope]

@Tratcher: My startup log message just gets printed over and over. I would expect it to print once and then wait for a web method to be called (which should then print another log line).

When i run the .exe from the commandline it starts and then prints a warning (I assume from System.ServiceProcess) saying this needs to be installed as a service.

There are no errors logged to the file, just seems like it is running the startup, finishing and starting again.

(When ive had crashes before the windows service would stop, but in this case it keeps running).

Hope that makes sense !

[stephenpope]

My Startup file in case it helps ..

    public class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            Log.Logger = new LoggerConfiguration()
                            .Enrich.FromLogContext()
                            .MinimumLevel.Debug()
                            .WriteTo.RollingFile("output.log")
                            .CreateLogger();
        }

        public void ConfigureServices(IServiceCollection services)
        {
        }

        public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddSerilog();
            var logger = loggerFactory.CreateLogger<Startup>();

            logger.LogDebug("Starting up ..");

            app.Run(async (context) =>
            {
                logger.LogDebug("Hello !!!");
                await context.Response.WriteAsync("Hello World!");
            });
        }
    }

Results in ..

2016-05-27 16:49:36.284 +01:00 [Debug] Starting up ..
2016-05-27 16:49:38.562 +01:00 [Debug] Starting up ..
2016-05-27 16:49:42.868 +01:00 [Debug] Starting up ..
2016-05-27 16:49:51.178 +01:00 [Debug] Starting up ..
2016-05-27 16:50:07.468 +01:00 [Debug] Starting up ..
2016-05-27 16:50:39.743 +01:00 [Debug] Starting up ..

[muratg]

The time-stamp differences from the logs have an interesting pattern.

Roughly: 2 secs, 4 secs, 8 secs, 16 secs, 32 secs... Curious.

[stephenpope]

So do you think this a bug or have I mis-configured my startup ? (Just wondering if this is a dead-end for now or I just need to tweak my program!)

[muratg]

@stephenpope I don't see anything in ASP.NET stack that could be doing exponential back-off. Perhaps Windows Service Host is doing it, though I'm not sure. There's nothing that does this in your code?

[stephenpope]

@muratg : Nope .. all my (pretty vanilla) code is above

[Tratcher]

@victorhurdugaci keep an eye out for this when you do your sign-offs.

[muratg]

We'd be happy to take a PR for this one.