///////////////////////////////////////////////////////////////////////////////
//
//  Microsoft Research Singularity
//
//  Copyright (c) Microsoft Corporation.  All rights reserved.
//
//  File: NicManager.sg1
//
//  Note:
//
//  When a network device comes up, it registers with the
//  NicManager, who places it in the namespace under
//  /dev/nicX and advertises its existence with the netstack
//  runtime core.  The netstack runtime core will be responsible
//  for notifying the NicManager when the device has gone away.
//

using System;
using System.Threading;
using Microsoft.SingSharp;
using Microsoft.Singularity;
using Microsoft.Singularity.V1.Services;
using Microsoft.Singularity.Channels;
using Microsoft.Singularity.Io;
using Microsoft.Singularity.Io.Net;
using Microsoft.Singularity.Directory;

using NetStack.Contracts;

namespace NetStack.Channels.Nic
{
    public class NicFactory
    {
        private static void ProbeNic(DirectoryServiceContract.Imp! ns,
                                     int number)
        {
            string! nicName = (!)String.Format("/dev/nic{0}", number);

            NicDeviceContract.Imp! imp;
            NicDeviceContract.Exp! exp;
            NicDeviceContract.NewChannel(out imp, out exp);

            Tracing.Log(Tracing.Debug, "Looking up {0}", nicName);
            ErrorCode errorOut;
            bool ok = SdsUtils.Bind(nicName, ns, exp, out errorOut);
            if (!ok) {
                delete imp;
                Tracing.Log(Tracing.Debug, "Error! reason {0}",
                            SdsUtils.ErrorCodeToString(errorOut));
            }
            else {
                Tracing.Log(Tracing.Debug, "Found {0}", nicName);
                Nic.CreateAndRegister(imp, nicName);
                Tracing.Log(Tracing.Debug, "Done with {0}", nicName);
            }
        }

        public static void Probe()
        {
            DirectoryServiceContract.Imp ns = DirectoryService.NewClientEndpoint();
            try {
                for (int i = 0; i < 10; i++) {
                    ProbeNic(ns, i);
                }
            }
            finally {
                delete ns;
            }
        }
    }
}