Tweak how the Horizon class and service manager work

- Store IServiceObjects in the service manager that return the usable objects instead of storing the objects directly
- Register FS services in the service manager instead of giving them special treatment
- Give each created HorizonClient its own "process ID"

src/LibHac/Bcat/BcatServer.cs

@@ -34,7 +34,7 @@ namespace LibHac.Bcat
 
             IServiceCreator service = GetServiceCreator(type);
 
-            Result rc = Hos.Sm.RegisterService(service, name);
+            Result rc = Hos.Sm.RegisterService(new BcatServiceObject(service), name);
             if (rc.IsFailure())
             {
                 throw new HorizonResultException(rc, "Abort");

src/LibHac/Bcat/Detail/Ipc/BcatServiceObject.cs

@@ -0,0 +1,20 @@
+using LibHac.Sm;
+
+namespace LibHac.Bcat.Detail.Ipc
+{
+    internal class BcatServiceObject : IServiceObject
+    {
+        private IServiceCreator _serviceCreator;
+
+        public BcatServiceObject(IServiceCreator serviceCreator)
+        {
+            _serviceCreator = serviceCreator;
+        }
+
+        public Result GetServiceObject(out object serviceObject)
+        {
+            serviceObject = _serviceCreator;
+            return Result.Success;
+        }
+    }
+}

src/LibHac/Fs/FileSystemClient.cs

@@ -2,6 +2,7 @@
 using System.Diagnostics;
 using System.Runtime.InteropServices;
 using LibHac.Common;
+using LibHac.Diag;
 using LibHac.Fs.Accessors;
 using LibHac.Fs.Fsa;
 using LibHac.FsSrv;
@@ -11,7 +12,7 @@ namespace LibHac.Fs
 {
     public partial class FileSystemClient
     {
-        private FileSystemServer FsSrv { get; }
+        private HorizonClient Hos { get; }
         private IFileSystemProxy FsProxy { get; set; }
 
         private readonly object _fspInitLocker = new object();
@@ -26,22 +27,17 @@ namespace LibHac.Fs
             Time = timer ?? new StopWatchTimeSpanGenerator();
         }
 
-        public FileSystemClient(FileSystemServer fsServer, ITimeSpanGenerator timer)
+        public FileSystemClient(HorizonClient horizonClient)
         {
-            FsSrv = fsServer;
-            Time = timer ?? new StopWatchTimeSpanGenerator();
-        }
+            Hos = horizonClient;
+            Time = horizonClient.Time;
 
-        internal FileSystemClient(FileSystemServer fsServer, IFileSystemProxy fsProxy, ITimeSpanGenerator timer)
-        {
-            FsSrv = fsServer;
-            FsProxy = fsProxy;
-            Time = timer ?? new StopWatchTimeSpanGenerator();
+            Assert.NotNull(Time);
         }
 
         public bool HasFileSystemServer()
         {
-            return FsSrv != null;
+            return Hos != null;
         }
 
         public IFileSystemProxy GetFileSystemProxyServiceObject()
@@ -57,8 +53,16 @@ namespace LibHac.Fs
                     throw new InvalidOperationException("Client was not initialized with a server object.");
                 }
 
-                FsProxy = FsSrv.CreateFileSystemProxyService();
+                Result rc = Hos.Sm.GetService(out IFileSystemProxy fsProxy, "fsp-srv");
 
+                if (rc.IsFailure())
+                {
+                    throw new HorizonResultException(rc, "Failed to create file system proxy service object.");
+                }
+
+                fsProxy.SetCurrentProcess(Hos.Os.GetCurrentProcessId().Value).IgnoreResult();
+
+                FsProxy = fsProxy;
                 return FsProxy;
             }
         }

src/LibHac/FsSrv/FileSystemProxy.cs

@@ -15,7 +15,7 @@ namespace LibHac.FsSrv
     public class FileSystemProxy : IFileSystemProxy
     {
         private FileSystemProxyCore FsProxyCore { get; }
-        internal FileSystemServer FsServer { get; }
+        internal HorizonClient Hos { get; }
 
         public ulong CurrentProcess { get; private set; }
 
@@ -24,10 +24,10 @@ namespace LibHac.FsSrv
         public FsPath SaveDataRootPath { get; }
         public bool AutoCreateSaveData { get; private set; }
 
-        internal FileSystemProxy(FileSystemProxyCore fsProxyCore, FileSystemServer fsServer)
+        internal FileSystemProxy(HorizonClient horizonClient, FileSystemProxyCore fsProxyCore)
         {
             FsProxyCore = fsProxyCore;
-            FsServer = fsServer;
+            Hos = horizonClient;
 
             CurrentProcess = ulong.MaxValue;
             SaveDataSize = 0x2000000;

src/LibHac/FsSrv/FileSystemServer.cs

@@ -3,6 +3,7 @@ using LibHac.Fs;
 using LibHac.Fs.Impl;
 using LibHac.Fs.Shim;
 using LibHac.FsSrv.Creators;
+using LibHac.Sm;
 
 namespace LibHac.FsSrv
 {
@@ -13,15 +14,17 @@ namespace LibHac.FsSrv
         private FileSystemProxyCore FsProxyCore { get; }
 
         /// <summary>The client instance to be used for internal operations like save indexer access.</summary>
-        public FileSystemClient FsClient { get; }
+        public HorizonClient Hos { get; }
+
         public bool IsDebugMode { get; }
         private ITimeSpanGenerator Timer { get; }
 
         /// <summary>
-        /// Creates a new <see cref="FileSystemServer"/>.
+        /// Creates a new <see cref="FileSystemServer"/> and registers its services using the provided HOS client.
         /// </summary>
+        /// <param name="horizonClient">The <see cref="HorizonClient"/> that will be used by this server.</param>
         /// <param name="config">The configuration for the created <see cref="FileSystemServer"/>.</param>
-        public FileSystemServer(FileSystemServerConfig config)
+        public FileSystemServer(HorizonClient horizonClient, FileSystemServerConfig config)
         {
             if (config.FsCreators == null)
                 throw new ArgumentException("FsCreators must not be null");
@@ -29,6 +32,8 @@ namespace LibHac.FsSrv
             if (config.DeviceOperator == null)
                 throw new ArgumentException("DeviceOperator must not be null");
 
+            Hos = horizonClient;
+
             IsDebugMode = false;
 
             ExternalKeySet externalKeySet = config.ExternalKeySet ?? new ExternalKeySet();
@@ -41,17 +46,19 @@ namespace LibHac.FsSrv
             };
 
             FsProxyCore = new FileSystemProxyCore(fspConfig, externalKeySet, config.DeviceOperator);
-            var fsProxy = new FileSystemProxy(FsProxyCore, this);
-            FsClient = new FileSystemClient(this, fsProxy, Timer);
 
-            // NS usually takes care of this
-            if (FsClient.IsSdCardInserted())
-                FsClient.SetSdCardAccessibility(true);
-
-            FsProxyCore.SetSaveDataIndexerManager(new SaveDataIndexerManager(FsClient, SaveIndexerId,
+            FsProxyCore.SetSaveDataIndexerManager(new SaveDataIndexerManager(Hos.Fs, SaveIndexerId,
                 new ArrayPoolMemoryResource(), new SdHandleManager(), false));
 
+            FileSystemProxy fsProxy = GetFileSystemProxyServiceObject();
+            fsProxy.SetCurrentProcess(Hos.Os.GetCurrentProcessId().Value).IgnoreResult();
             fsProxy.CleanUpTemporaryStorage().IgnoreResult();
+
+            Hos.Sm.RegisterService(new FileSystemProxyService(this), "fsp-srv").IgnoreResult();
+
+            // NS usually takes care of this
+            if (Hos.Fs.IsSdCardInserted())
+                Hos.Fs.SetSdCardAccessibility(true);
         }
 
         /// <summary>
@@ -69,12 +76,35 @@ namespace LibHac.FsSrv
         /// <returns>The created <see cref="FileSystemClient"/>.</returns>
         public FileSystemClient CreateFileSystemClient(ITimeSpanGenerator timer)
         {
-            return new FileSystemClient(this, timer);
+            return new FileSystemClient(Hos);
         }
 
-        public IFileSystemProxy CreateFileSystemProxyService()
+        private FileSystemProxy GetFileSystemProxyServiceObject()
         {
-            return new FileSystemProxy(FsProxyCore, this);
+            return new FileSystemProxy(Hos, FsProxyCore);
+        }
+
+        internal bool IsCurrentProcess(ulong processId)
+        {
+            ulong currentId = Hos.Os.GetCurrentProcessId().Value;
+
+            return processId == currentId;
+        }
+
+        private class FileSystemProxyService : IServiceObject
+        {
+            private readonly FileSystemServer _server;
+
+            public FileSystemProxyService(FileSystemServer server)
+            {
+                _server = server;
+            }
+
+            public Result GetServiceObject(out object serviceObject)
+            {
+                serviceObject = _server.GetFileSystemProxyServiceObject();
+                return Result.Success;
+            }
         }
     }
 

src/LibHac/FsSrv/Impl/MultiCommitManager.cs

@@ -109,7 +109,7 @@ namespace LibHac.FsSrv.Impl
                     return rc;
                 }
 
-                rc = FsProxy.FsServer.FsClient.CreateSystemSaveData(SaveDataId, SaveDataSize, SaveJournalSize,
+                rc = FsProxy.Hos.Fs.CreateSystemSaveData(SaveDataId, SaveDataSize, SaveJournalSize,
                     SaveDataFlags.None);
                 if (rc.IsFailure()) return rc;
             }

src/LibHac/FsSrv/Impl/ProgramRegistryManager.cs

@@ -183,12 +183,6 @@ namespace LibHac.FsSrv.Impl
             return initialProcessIdLowerBound >= processId && processId <= initialProcessIdUpperBound;
         }
 
-        public static bool IsCurrentProcess(ulong processId)
-        {
-            // Todo: Don't use hardcoded value
-            return true;
-        }
-
         internal static ProgramInfo CreateProgramInfoForInitialProcess(FileSystemServer fsServer)
         {
             return new ProgramInfo(fsServer, InitialProcessAccessControlDataHeader,

src/LibHac/Horizon.cs

@@ -1,7 +1,7 @@
-using LibHac.Common;
-using LibHac.Fs;
+using System.Threading;
+using LibHac.Bcat;
 using LibHac.FsSrv;
-using LibHac.FsSrv.Creators;
+using LibHac.Os;
 using LibHac.Sm;
 
 namespace LibHac
@@ -9,63 +9,32 @@ namespace LibHac
     public class Horizon
     {
         internal ITimeSpanGenerator Time { get; }
-        private FileSystemServer FileSystemServer { get; set; }
         internal ServiceManager ServiceManager { get; }
 
-        private readonly object _initLocker = new object();
+        // long instead of ulong because the ulong Interlocked.Increment overload
+        // wasn't added until .NET 5
+        private long _currentProcessId;
 
-        public Horizon(ITimeSpanGenerator timer)
+        public Horizon(ITimeSpanGenerator timer, FileSystemServerConfig fsServerConfig)
         {
+            _currentProcessId = 0;
+
             Time = timer ?? new StopWatchTimeSpanGenerator();
-            ServiceManager = new ServiceManager(this);
+            ServiceManager = new ServiceManager();
+
+            // ReSharper disable ObjectCreationAsStatement
+            new FileSystemServer(CreateHorizonClient(), fsServerConfig);
+            new BcatServer(CreateHorizonClient());
+            // ReSharper restore ObjectCreationAsStatement
         }
 
-        public Horizon(ITimeSpanGenerator timer, FileSystemServer fsServer)
+        public HorizonClient CreateHorizonClient()
         {
-            Time = timer ?? new StopWatchTimeSpanGenerator();
-            FileSystemServer = fsServer;
-            ServiceManager = new ServiceManager(this);
-        }
+            ulong processId = (ulong)Interlocked.Increment(ref _currentProcessId);
 
-        private Result OpenFileSystemClient(out FileSystemClient client)
-        {
-            if (FileSystemServer is null)
-            {
-                client = default;
-                return ResultLibHac.ServiceNotInitialized.Log();
-            }
+            // Todo: Register process with FS
 
-            client = FileSystemServer.CreateFileSystemClient();
-            return Result.Success;
-        }
-
-        public Result CreateHorizonClient(out HorizonClient client)
-        {
-            Result rc = OpenFileSystemClient(out FileSystemClient fsClient);
-            if (rc.IsFailure())
-            {
-                client = default;
-                return rc;
-            }
-
-            client = new HorizonClient(this, fsClient);
-            return Result.Success;
-        }
-
-        public void InitializeFileSystemServer(FileSystemCreators fsCreators, IDeviceOperator deviceOperator)
-        {
-            if (FileSystemServer != null) return;
-
-            lock (_initLocker)
-            {
-                if (FileSystemServer != null) return;
-
-                var config = new FileSystemServerConfig();
-                config.FsCreators = fsCreators;
-                config.DeviceOperator = deviceOperator;
-
-                FileSystemServer = new FileSystemServer(config);
-            }
+            return new HorizonClient(this, new ProcessId(processId));
         }
     }
 }

src/LibHac/HorizonClient.cs

@@ -1,6 +1,7 @@
 using System;
 using LibHac.Arp;
 using LibHac.Fs;
+using LibHac.Os;
 using LibHac.Sm;
 
 namespace LibHac
@@ -9,19 +10,25 @@ namespace LibHac
     {
         // ReSharper disable once UnusedAutoPropertyAccessor.Local
         private Horizon Horizon { get; }
+        internal ProcessId ProcessId { get; }
 
         private Lazy<ArpClient> ArpLazy { get; }
 
         public FileSystemClient Fs { get; }
         public ServiceManagerClient Sm { get; }
+        public OsClient Os { get; }
         public ArpClient Arp => ArpLazy.Value;
 
-        internal HorizonClient(Horizon horizon, FileSystemClient fsClient)
+        public ITimeSpanGenerator Time => Horizon.Time;
+
+        internal HorizonClient(Horizon horizon, ProcessId processId)
         {
             Horizon = horizon;
+            ProcessId = processId;
 
-            Fs = fsClient;
+            Fs = new FileSystemClient(this);
             Sm = new ServiceManagerClient(horizon.ServiceManager);
+            Os = new OsClient(this);
 
             ArpLazy = new Lazy<ArpClient>(InitArpClient, true);
         }

src/LibHac/Os/OsClient.cs

@@ -0,0 +1,17 @@
+namespace LibHac.Os
+{
+    public class OsClient
+    {
+        private HorizonClient Hos { get; }
+
+        internal OsClient(HorizonClient horizonClient)
+        {
+            Hos = horizonClient;
+        }
+
+        public ProcessId GetCurrentProcessId()
+        {
+            return Hos.ProcessId;
+        }
+    }
+}

src/LibHac/Os/ProcessId.cs

@@ -0,0 +1,11 @@
+namespace LibHac.Os
+{
+    public readonly struct ProcessId
+    {
+        public static ProcessId InvalidId => new ProcessId(ulong.MaxValue);
+
+        public readonly ulong Value;
+
+        public ProcessId(ulong value) => Value = value;
+    }
+}

src/LibHac/Sm/IServiceObject.cs

@@ -0,0 +1,9 @@
+namespace LibHac.Sm
+{
+    // This interface is being used as a stop-gap solution so we can
+    // have at least some sort of service system for now
+    public interface IServiceObject
+    {
+        Result GetServiceObject(out object serviceObject);
+    }
+}

src/LibHac/Sm/ServiceManager.cs

@@ -11,14 +11,7 @@ namespace LibHac.Sm
     // isn't blocked waiting for something better.
     internal class ServiceManager
     {
-        // ReSharper disable once UnusedAutoPropertyAccessor.Local
-        private Horizon Horizon { get; }
-        private Dictionary<ServiceName, object> Services { get; } = new Dictionary<ServiceName, object>();
-
-        public ServiceManager(Horizon horizon)
-        {
-            Horizon = horizon;
-        }
+        private Dictionary<ServiceName, IServiceObject> Services { get; } = new Dictionary<ServiceName, IServiceObject>();
 
         internal Result GetService(out object serviceObject, ServiceName serviceName)
         {
@@ -27,20 +20,20 @@ namespace LibHac.Sm
             Result rc = ValidateServiceName(serviceName);
             if (rc.IsFailure()) return rc;
 
-            if (!Services.TryGetValue(serviceName, out serviceObject))
+            if (!Services.TryGetValue(serviceName, out IServiceObject service))
             {
                 return ResultSf.RequestDeferredByUser.Log();
             }
 
-            return Result.Success;
+            return service.GetServiceObject(out serviceObject);
         }
 
-        internal Result RegisterService(object serviceObject, ServiceName serviceName)
+        internal Result RegisterService(IServiceObject service, ServiceName serviceName)
         {
             Result rc = ValidateServiceName(serviceName);
             if (rc.IsFailure()) return rc;
 
-            if (!Services.TryAdd(serviceName, serviceObject))
+            if (!Services.TryAdd(serviceName, service))
             {
                 return ResultSm.AlreadyRegistered.Log();
             }
@@ -53,11 +46,12 @@ namespace LibHac.Sm
             Result rc = ValidateServiceName(serviceName);
             if (rc.IsFailure()) return rc;
 
-            if (!Services.Remove(serviceName, out object service))
+            if (!Services.Remove(serviceName, out IServiceObject service))
             {
                 return ResultSm.NotRegistered.Log();
             }
 
+            // ReSharper disable once SuspiciousTypeConversion.Global
             if (service is IDisposable disposable)
             {
                 disposable.Dispose();

src/LibHac/Sm/ServiceManagerClient.cs

@@ -29,7 +29,7 @@ namespace LibHac.Sm
             throw new InvalidCastException("The service object is not of the specified type.");
         }
 
-        public Result RegisterService(object serviceObject, ReadOnlySpan<char> name)
+        public Result RegisterService(IServiceObject serviceObject, ReadOnlySpan<char> name)
         {
             return Server.RegisterService(serviceObject, ServiceName.Encode(name));
         }

tests/LibHac.Tests/Fs/FileSystemClientTests/FileSystemServerFactory.cs

@@ -6,7 +6,7 @@ namespace LibHac.Tests.Fs.FileSystemClientTests
 {
     public static class FileSystemServerFactory
     {
-        public static FileSystemServer CreateServer(bool sdCardInserted, out IFileSystem rootFs)
+        private static FileSystemClient CreateClientImpl(bool sdCardInserted, out IFileSystem rootFs)
         {
             rootFs = new InMemoryFileSystem();
 
@@ -19,23 +19,21 @@ namespace LibHac.Tests.Fs.FileSystemClientTests
             config.DeviceOperator = defaultObjects.DeviceOperator;
             config.ExternalKeySet = new ExternalKeySet();
 
-            var fsServer = new FileSystemServer(config);
+            var horizon = new Horizon(new StopWatchTimeSpanGenerator(), config);
 
-            return fsServer;
+            HorizonClient horizonClient = horizon.CreateHorizonClient();
+
+            return horizonClient.Fs;
         }
 
         public static FileSystemClient CreateClient(bool sdCardInserted)
         {
-            FileSystemServer fsServer = CreateServer(sdCardInserted, out _);
-
-            return fsServer.CreateFileSystemClient();
+            return CreateClientImpl(sdCardInserted, out _);
         }
 
         public static FileSystemClient CreateClient(out IFileSystem rootFs)
         {
-            FileSystemServer fsServer = CreateServer(false, out rootFs);
-
-            return fsServer.CreateFileSystemClient();
+            return CreateClientImpl(false, out rootFs);
         }
     }
 }