wip

CryptoExchange.Net.UnitTests/SharedApiClientTests.cs

@@ -1,5 +1,7 @@
-using CryptoExchange.Net.SharedApis;
+using CryptoExchange.Net.SharedApis;
+using Microsoft.Extensions.DependencyInjection;
 using NUnit.Framework;
+using System.Linq;
 
 namespace CryptoExchange.Net.UnitTests
 {
@@ -16,7 +18,7 @@ namespace CryptoExchange.Net.UnitTests
 
             Assert.Multiple(() =>
             {
-                Assert.That(client.GetCapability<ITestCapability>(TradingMode.Spot), Is.SameAs(sharedApi));
+                Assert.That(client.GetCapability<ITestCapability>(TradingMode.Spot)?.Capability, Is.SameAs(sharedApi));
                 Assert.That(client.GetCapability<ITestCapability>(TradingMode.PerpetualLinear), Is.Null);
                 Assert.That(client.GetCapabilities<ITestCapability>(TradingMode.Spot), Has.Count.EqualTo(1));
                 Assert.That(client.GetCapabilities<ITestCapability>(TradingMode.PerpetualLinear), Is.Empty);
@@ -33,8 +35,73 @@ namespace CryptoExchange.Net.UnitTests
 
             Assert.Multiple(() =>
             {
-                Assert.That(client.GetCapability<ITestCapability>(TradingMode.Spot), Is.SameAs(sharedApi));
-                Assert.That(client.GetCapability<ITestCapability>(TradingMode.PerpetualLinear), Is.SameAs(sharedApi));
+                Assert.That(client.GetCapability<ITestCapability>(TradingMode.Spot)?.Capability, Is.SameAs(sharedApi));
+                Assert.That(client.GetCapability<ITestCapability>(TradingMode.PerpetualLinear)?.Capability, Is.SameAs(sharedApi));
+            });
+        }
+
+        [Test]
+        public void GetCapabilities_WithReference_ShouldReturnMatchingCapabilities()
+        {
+            var sharedApi = new TestSharedApi(
+                [TradingMode.Spot],
+                [TradingMode.Spot]);
+            var client = new TestSharedApiClient(sharedApi);
+
+            var result = client.GetCapabilities(
+                new SharedCapabilityReference<ITestCapability>(),
+                TradingMode.Spot);
+
+            Assert.That(result, Has.Count.EqualTo(1));
+            Assert.That(result[0].Capability, Is.SameAs(sharedApi));
+            Assert.That(result[0].Options, Is.SameAs(sharedApi.CapabilityOptions));
+        }
+
+        [Test]
+        public void Discover_ShouldReturnAllSharedApiInformation()
+        {
+            var restApi = new TestRestSharedApi();
+            var socketApi = new TestSocketSharedApi();
+            var client = new TestDiSharedApiClient(
+                SharedTransport.Socket,
+                restApi,
+                socketApi);
+
+            var result = client.Discover();
+
+            Assert.Multiple(() =>
+            {
+                Assert.That(result.PreferredTransport, Is.EqualTo(SharedTransport.Socket));
+                Assert.That(result.SharedApis, Has.Length.EqualTo(2));
+                Assert.That(result.SharedApis[0].Transport, Is.EqualTo(SharedTransport.Rest));
+                Assert.That(result.SharedApis[1].Transport, Is.EqualTo(SharedTransport.Socket));
+                Assert.That(result.SharedApis[0].SupportedTradingModes, Is.EqualTo(new[] { TradingMode.Spot }));
+                Assert.That(result.SharedApis[0].Capabilities, Has.Length.EqualTo(1));
+                Assert.That(result.SharedApis[0].Authenticated, Is.False);
+            });
+        }
+
+        [Test]
+        public void RegisterSharedApiClientCapabilities_ShouldResolvePreferredTransport()
+        {
+            var restApi = new TestRestSharedApi();
+            var socketApi = new TestSocketSharedApi();
+            var services = new ServiceCollection();
+
+            services.RegisterSharedApi<ITestRestSharedApi>(_ => restApi);
+            services.RegisterSharedApi<ITestSocketSharedApi>(_ => socketApi);
+            services.AddTransient<ITestSharedApiClient>(_ =>
+                new TestDiSharedApiClient(SharedTransport.Socket, restApi, socketApi));
+            services.RegisterSharedApiClientCapabilities<ITestSharedApiClient>();
+
+            using var provider = services.BuildServiceProvider();
+
+            Assert.Multiple(() =>
+            {
+                Assert.That(provider.GetRequiredService<ITestCapability>(), Is.SameAs(socketApi));
+                Assert.That(provider.GetServices<ITestCapability>().ToArray(), Is.EqualTo(new[] { socketApi }));
+                Assert.That(provider.GetRequiredService<ITestRestCapability>(), Is.SameAs(restApi));
+                Assert.That(provider.GetRequiredService<ITestSocketCapability>(), Is.SameAs(socketApi));
             });
         }
 
@@ -101,6 +168,28 @@ namespace CryptoExchange.Net.UnitTests
         {
         }
 
+        private interface ITestRestCapability : ITestCapability, ISharedRest
+        {
+        }
+
+        private interface ITestSocketCapability : ITestCapability, ISharedSocket
+        {
+        }
+
+        private interface ITestRestSharedApi : ITestRestCapability
+        {
+        }
+
+        private interface ITestSocketSharedApi : ITestSocketCapability
+        {
+        }
+
+        private interface ITestSharedApiClient : ISharedApiClientBase
+        {
+            ITestRestSharedApi Rest { get; }
+            ITestSocketSharedApi Socket { get; }
+        }
+
         private sealed class TestCapabilityOptions : CapabilityOptions<SharedRequest, ITestCapability>
         {
             public override string Description => "Test capability";
@@ -159,10 +248,64 @@ namespace CryptoExchange.Net.UnitTests
             public override SharedClientInfo Discover() => new();
         }
 
+        private abstract class TestTransportSharedApi : SharedApiBase
+        {
+            protected TestTransportSharedApi(SharedTransport transport)
+                : base(
+                    transport,
+                    "TestExchange",
+                    [TradingMode.Spot],
+                    () => false,
+                    (baseAsset, quoteAsset, tradingMode, deliverDate) => $"{baseAsset}{quoteAsset}")
+            {
+                SetCapabilities(new TestCapabilityOptions([TradingMode.Spot]));
+            }
+
+            public override SharedClientInfo Discover() => new()
+            {
+                Exchange = this.Exchange,
+                TypeName = GetType().Name,
+                SupportedTradingModes = this.SupportedTradingModes,
+                Transport = this.Transport,
+                Authenticated = this.Authenticated,
+                Capabilities = ((ISharedApi)this).Capabilities.ToArray()
+            };
+        }
+
+        private sealed class TestRestSharedApi : TestTransportSharedApi, ITestRestSharedApi
+        {
+            public TestRestSharedApi() : base(SharedTransport.Rest)
+            {
+            }
+        }
+
+        private sealed class TestSocketSharedApi : TestTransportSharedApi, ITestSocketSharedApi
+        {
+            public TestSocketSharedApi() : base(SharedTransport.Socket)
+            {
+            }
+        }
+
+        private sealed class TestDiSharedApiClient : SharedApiClientBase, ITestSharedApiClient
+        {
+            public ITestRestSharedApi Rest { get; }
+            public ITestSocketSharedApi Socket { get; }
+
+            public TestDiSharedApiClient(
+                SharedTransport preferredTransport,
+                ITestRestSharedApi rest,
+                ITestSocketSharedApi socket)
+                : base(preferredTransport, rest, socket)
+            {
+                Rest = rest;
+                Socket = socket;
+            }
+        }
+
         private sealed class TestSharedApiClient : SharedApiClientBase
         {
             public TestSharedApiClient(params ISharedApiCapability[] sharedApis)
-                : base([SharedTransport.Rest, SharedTransport.Socket], sharedApis)
+                : base(SharedTransport.Rest, sharedApis)
             {
             }
         }

CryptoExchange.Net/ExtensionMethods.cs

@@ -488,19 +488,77 @@ namespace CryptoExchange.Net
         {
             services.AddTransient<TSharedApi>(factory);
 
-            var markerInterfaces = new[]
-            {
-                typeof(ISharedApiCapability),
-                typeof(ISharedRest),
-                typeof(ISharedSocket),
-                typeof(ISharedSubscription)
-            };
+            var allInterfaces = typeof(TSharedApi).GetInterfaces();
 
-            var capabilityInterfaces = typeof(TSharedApi)
-                .GetInterfaces()
+            var transportCapabilityInterfaces = allInterfaces
                 .Where(x =>
                     typeof(ISharedApiCapability).IsAssignableFrom(x)
-                    && !markerInterfaces.Contains(x))
+                    && (typeof(ISharedRest).IsAssignableFrom(x)
+                        || typeof(ISharedSocket).IsAssignableFrom(x))
+                    && x != typeof(ISharedRest)
+                    && x != typeof(ISharedSocket)
+                    && x != typeof(ISharedSubscription))
+                .Distinct()
+                .ToArray();
+
+            var baseCapabilityInterfaces = allInterfaces
+                .Where(x =>
+                    x != typeof(ISharedApiCapability)
+                    && typeof(ISharedApiCapability).IsAssignableFrom(x)
+                    && !typeof(ISharedRest).IsAssignableFrom(x)
+                    && !typeof(ISharedSocket).IsAssignableFrom(x))
+                .Distinct()
+                .ToArray();
+
+            services.AddSingleton(new SharedApiRegistrationInfo(
+                typeof(TSharedApi),
+                baseCapabilityInterfaces));
+
+            foreach (var capabilityInterface in transportCapabilityInterfaces)
+            {
+                services.AddTransient(
+                    capabilityInterface,
+                    serviceProvider =>
+                        serviceProvider.GetRequiredService<TSharedApi>());
+            }
+
+            return services;
+        }
+
+        /// <summary>
+        /// Registers transport-agnostic Shared API capabilities through the
+        /// exchange-specific Shared API aggregate client.
+        /// </summary>
+        public static IServiceCollection RegisterSharedApiClientCapabilities<
+#if NET5_0_OR_GREATER
+    [DynamicallyAccessedMembers(
+        DynamicallyAccessedMemberTypes.PublicProperties | DynamicallyAccessedMemberTypes.PublicConstructors)]
+#endif
+            TSharedApiClient>(
+            this IServiceCollection services)
+            where TSharedApiClient : class, ISharedApiClientBase
+        {
+            services.AddTransient<ISharedApiClientBase>(serviceProvider =>
+                serviceProvider.GetRequiredService<TSharedApiClient>());
+
+            var sharedApiTypes = new HashSet<Type>(
+                typeof(TSharedApiClient)
+                    .GetProperties()
+                    .Where(property =>
+                        typeof(ISharedApi).IsAssignableFrom(
+                            property.PropertyType))
+                    .Select(property => property.PropertyType));
+
+            var capabilityInterfaces = services
+                .Where(descriptor =>
+                    descriptor.ImplementationInstance
+                        is SharedApiRegistrationInfo)
+                .Select(descriptor =>
+                    (SharedApiRegistrationInfo)descriptor.ImplementationInstance!)
+                .Where(registration =>
+                    sharedApiTypes.Contains(registration.SharedApiType))
+                .SelectMany(registration =>
+                    registration.BaseCapabilityTypes)
                 .Distinct()
                 .ToArray();
 
@@ -509,7 +567,22 @@ namespace CryptoExchange.Net
                 services.AddTransient(
                     capabilityInterface,
                     serviceProvider =>
-                        serviceProvider.GetRequiredService<TSharedApi>());
+                    {
+                        var sharedApiClient = serviceProvider
+                            .GetRequiredService<TSharedApiClient>();
+
+                        if (sharedApiClient is not ISharedApiClientResolver resolver)
+                        {
+                            throw new InvalidOperationException(
+                                $"{typeof(TSharedApiClient).Name} should derive from " +
+                                $"{nameof(SharedApiClientBase)}");
+                        }
+
+                        return resolver.GetCapability(capabilityInterface)
+                            ?? throw new InvalidOperationException(
+                                $"No implementation of " +
+                                $"{capabilityInterface.Name} is available");
+                    });
             }
 
             return services;

CryptoExchange.Net/SharedApis/CapabilityReferences/SharedCapabilityResolution.cs

@@ -11,6 +11,16 @@ namespace CryptoExchange.Net.SharedApis
     public class SharedCapabilityResolution<T>
         where T : ISharedApiCapability
     {
+        /// <summary>
+        /// The exchange name
+        /// </summary>
+        public string Exchange => Capability.Exchange;
+
+        /// <summary>
+        /// The transport type
+        /// </summary>
+        public SharedTransport Transport => Capability.Transport;
+
         /// <summary>
         /// The capability
         /// </summary>

CryptoExchange.Net/SharedApis/Enums/SharedTransport.cs

@@ -7,15 +7,15 @@ namespace CryptoExchange.Net.SharedApis
     /// <summary>
     /// The type of transport used for the shared API
     /// </summary>
-    public record SharedTransport(string Name)
+    public enum SharedTransport
     {
         /// <summary>
         /// REST transport
         /// </summary>
-        public static SharedTransport Rest { get; } = new("REST");
+        Rest,
         /// <summary>
         /// WebSocket transport
         /// </summary>
-        public static SharedTransport Socket { get; } = new("WebSocket");
+        Socket
     }
 }

CryptoExchange.Net/SharedApis/Models/SharedApiClientInfo.cs

@@ -0,0 +1,49 @@
+using System.Text;
+
+namespace CryptoExchange.Net.SharedApis
+{
+    /// <summary>
+    /// Discovery information for a Shared API client.
+    /// </summary>
+    public class SharedApiClientInfo
+    {
+        /// <summary>
+        /// Preferred transport when multiple implementations of a capability are available.
+        /// </summary>
+        public SharedTransport PreferredTransport { get; }
+
+        /// <summary>
+        /// Shared APIs available on the client.
+        /// </summary>
+        public SharedClientInfo[] SharedApis { get; }
+
+        internal SharedApiClientInfo(
+            SharedTransport preferredTransport,
+            SharedClientInfo[] sharedApis)
+        {
+            PreferredTransport = preferredTransport;
+            SharedApis = sharedApis;
+        }
+
+        /// <inheritdoc />
+        public override string ToString() => ToString(false);
+
+        /// <summary>
+        /// Create a string representation of the available Shared APIs.
+        /// </summary>
+        /// <param name="detailed">Whether to include detailed capability information.</param>
+        public string ToString(bool detailed)
+        {
+            var builder = new StringBuilder();
+            builder.AppendLine($"Preferred transport: {PreferredTransport}");
+
+            foreach (var sharedApi in SharedApis)
+            {
+                builder.AppendLine();
+                builder.Append(sharedApi.ToString(detailed));
+            }
+
+            return builder.ToString();
+        }
+    }
+}

CryptoExchange.Net/SharedApis/Models/SharedClientInfo.cs

@@ -35,6 +35,14 @@ namespace CryptoExchange.Net.SharedApis
         /// </summary>
         public CentralizationType CentralizationType { get; set; }
         /// <summary>
+        /// The underlying transport type used by this client
+        /// </summary>
+        public SharedTransport Transport { get; init; }
+        /// <summary>
+        /// Whether API credentials have been configured for this client. Does not check whether the credentials are valid.
+        /// </summary>
+        public bool Authenticated { get; init; }
+        /// <summary>
         /// Use Capabilities instead
         /// </summary>
 #pragma warning disable CS0618 // Type or member is obsolete
@@ -74,6 +82,8 @@ namespace CryptoExchange.Net.SharedApis
             sb.AppendLine($"Supported environments: {string.Join(", ", SupportedEnvironments)}");
             sb.AppendLine($"Supported trading modes: {string.Join(", ", SupportedTradingModes)}");
             sb.AppendLine($"Centralization type: {CentralizationType}");
+            sb.AppendLine($"Transport: {Transport}");
+            sb.AppendLine($"Authenticated: {Authenticated}");
             sb.AppendLine($"Capabilities:");
             foreach (var capability in Capabilities)
             {

CryptoExchange.Net/SharedApis/Options/SharedApiOptions.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace CryptoExchange.Net.SharedApis
+{
+    /// <summary>
+    /// Options for Shared API client instances
+    /// </summary>
+    public class SharedApiOptions
+    {
+        /// <summary>
+        /// Whether to use XPerps as perpetual linear contracts when using the Shared API's
+        /// </summary>
+        public bool EuropeUseXPerps { get; set; }
+        /// <summary>
+        /// The preferred transport type when requesting transport agnostic capabilities
+        /// </summary>
+        public SharedTransport PreferredTransport { get; set; }
+            = SharedTransport.Rest;
+    }
+}

CryptoExchange.Net/SharedApis/Parameters/ParameterDescription.cs

@@ -65,7 +65,7 @@ namespace CryptoExchange.Net.SharedApis
         /// <inheritdoc />
         public override string ToString()
         {
-            return $"[{ValueType.Name}] \"{Name}\" {string.Join(" / ", Aliases.Select(x => $"\"{x}\""))}: {Description}";
+            return $"[{(Nullable.GetUnderlyingType(ValueType) ?? ValueType).Name}] \"{Name}\" {string.Join(" / ", Aliases.Select(x => $"\"{x}\""))}: {Description}";
         }
     }
 
@@ -135,7 +135,7 @@ namespace CryptoExchange.Net.SharedApis
         /// <inheritdoc />
         public override string ToString()
         {
-            return $"[{Support}] [{ValueType.Name}] \"{Name}\" {string.Join(" / ", Aliases.Select(x => $"\"{x}\""))}: {Description}";
+            return $"[{Support}] [{(Nullable.GetUnderlyingType(ValueType) ?? ValueType).Name}] \"{Name}\" {string.Join(" / ", Aliases.Select(x => $"\"{x}\""))}: {Description}";
         }
     }
 
@@ -167,7 +167,7 @@ namespace CryptoExchange.Net.SharedApis
         /// <inheritdoc />
         public override string ToString()
         {
-            return $"[{Requirement}] [{ValueType.Name}] \"{Name}\" {string.Join(" / ", Aliases.Select(x => $"\"{x}\""))}: {Description}";
+            return $"[{Requirement}] [{(Nullable.GetUnderlyingType(ValueType) ?? ValueType).Name}] \"{Name}\" {string.Join(" / ", Aliases.Select(x => $"\"{x}\""))}: {Description}";
         }
     }
 }

CryptoExchange.Net/SharedApis/SharedApiClientBase.cs

@@ -1,10 +1,15 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 
 namespace CryptoExchange.Net.SharedApis
 {
+    internal interface ISharedApiClientResolver
+    {
+        object? GetCapability(Type capabilityType);
+    }
+
     /// <summary>
     /// Base interface for Shared API clients
     /// </summary>
@@ -14,6 +19,19 @@ namespace CryptoExchange.Net.SharedApis
         /// Shared API's available on this client
         /// </summary>
         IReadOnlyList<ISharedApi> SharedApis { get; }
+        /// <summary>
+        /// Preferred transport selection when multiple transport options are available
+        /// </summary>
+        SharedTransport PreferredTransport { get; }
+
+        /// <summary>
+        /// Get discovery information for the Shared APIs available on this client.
+        /// </summary>
+        SharedApiClientInfo Discover();
+        /// <summary>
+        /// The exchange name of this client
+        /// </summary>
+        string Exchange { get; }
 
         /// <summary>
         /// Get all capabilities matching the provided capability type.
@@ -26,6 +44,17 @@ namespace CryptoExchange.Net.SharedApis
         IReadOnlyList<SharedCapabilityResolution<T>> GetCapabilities<T>(TradingMode? tradingMode = null, SharedTransport? transport = null)
             where T : ISharedApiCapability;
 
+        /// <summary>
+        /// Get all capabilities matching the provided capability reference.
+        /// </summary>
+        /// <typeparam name="T">The capability type.</typeparam>
+        /// <param name="capability">The capability reference.</param>
+        /// <param name="tradingMode">Filter by supported trading mode.</param>
+        IReadOnlyList<SharedCapabilityResolution<T>> GetCapabilities<T>(
+            SharedCapabilityReference<T> capability,
+            TradingMode? tradingMode = null)
+            where T : ISharedApiCapability;
+
         /// <summary>
         /// Get the requested capability type. If more than one implementation is available the first one is returned.
         /// In this case prefer using <see cref="GetCapability{T}(TradingMode, SharedTransport?)"/> to select a specific trading mode.
@@ -74,30 +103,43 @@ namespace CryptoExchange.Net.SharedApis
         /// <returns>The requested capability type or null if not found</returns>
         SharedCapabilityResolution<T>? GetCapability<T>(SharedCapabilityReference<T> capability, TradingMode tradingMode)
             where T : ISharedApiCapability;
+
     }
 
     /// <summary>
     /// Base client for Shared API clients
     /// </summary>
-    public abstract class SharedApiClientBase : ISharedApiClientBase
+    public abstract class SharedApiClientBase : ISharedApiClientBase, ISharedApiClientResolver
     {
         private readonly ISharedApi[] _sharedApis;
-        private readonly SharedTransport[] _preferredTransports;
+        private readonly SharedTransport _preferredTransport;
 
         /// <inheritdoc />
         public IReadOnlyList<ISharedApi> SharedApis => _sharedApis;
+        /// <inheritdoc />
+        public SharedTransport PreferredTransport => _preferredTransport;
+        /// <inheritdoc />
+        public string Exchange => _sharedApis[0].Exchange;
 
         /// <summary>
         /// ctor
         /// </summary>
         public SharedApiClientBase(
-            IEnumerable<SharedTransport> transportPreference,
+            SharedTransport transportPreference,
             params ISharedApi[] sharedApis)
         {
-            _preferredTransports = transportPreference.Distinct().ToArray();
+            _preferredTransport = transportPreference;
             _sharedApis = sharedApis.Distinct().ToArray();
         }
 
+        /// <inheritdoc />
+        public SharedApiClientInfo Discover()
+        {
+            return new SharedApiClientInfo(
+                PreferredTransport,
+                _sharedApis.Select(x => x.Discover()).ToArray());
+        }
+
         /// <inheritdoc />
         public SharedCapabilityResolution<T>? GetCapability<T>(SharedTransport? transport = null)
             where T : ISharedApiCapability
@@ -126,6 +168,7 @@ namespace CryptoExchange.Net.SharedApis
             return GetCapabilityCore<T>(tradingMode, null);
         }
 
+
         /// <inheritdoc />
         public IReadOnlyList<SharedCapabilityResolution<T>> GetCapabilities<T>(
             TradingMode? tradingMode = null,
@@ -157,6 +200,29 @@ namespace CryptoExchange.Net.SharedApis
                 .ToArray();
         }
 
+        /// <inheritdoc />
+        public IReadOnlyList<SharedCapabilityResolution<T>> GetCapabilities<T>(
+            SharedCapabilityReference<T> capability,
+            TradingMode? tradingMode = null)
+            where T : ISharedApiCapability
+        {
+            return GetCapabilities<T>(tradingMode);
+        }
+
+        object? ISharedApiClientResolver.GetCapability(Type capabilityType)
+        {
+            return _sharedApis
+                .Where(sharedApi =>
+                    capabilityType.IsInstanceOfType(sharedApi)
+                    && GetMatchingOptions(
+                        sharedApi,
+                        capabilityType,
+                        null) != null)
+                .OrderBy(sharedApi =>
+                    GetTransportPriority(sharedApi.Transport))
+                .FirstOrDefault();
+        }
+
         private SharedCapabilityResolution<T>? GetCapabilityCore<T>(
             TradingMode? tradingMode,
             SharedTransport? selectedTransport = null)
@@ -171,8 +237,17 @@ namespace CryptoExchange.Net.SharedApis
             TradingMode? tradingMode)
             where T : ISharedApiCapability
         {
-            var requestedType = typeof(T);
+            return GetMatchingOptions(
+                sharedApi,
+                typeof(T),
+                tradingMode);
+        }
 
+        private static CapabilityOptions? GetMatchingOptions(
+            ISharedApi sharedApi,
+            Type requestedType,
+            TradingMode? tradingMode)
+        {
             return sharedApi.Capabilities
                 .Where(options =>
                     options.Supported
@@ -182,7 +257,6 @@ namespace CryptoExchange.Net.SharedApis
                     && (tradingMode == null
                         || options.SupportedTradingModes.Contains(
                             tradingMode.Value)))
-                // Prefer options declared for the exact requested interface.
                 .OrderByDescending(options =>
                     options.CapabilityType == requestedType)
                 .FirstOrDefault();
@@ -198,8 +272,7 @@ namespace CryptoExchange.Net.SharedApis
 
         private int GetTransportPriority(SharedTransport transport)
         {
-            var index = Array.IndexOf(_preferredTransports, transport);
-            return index == -1 ? int.MaxValue : index;
+            return transport == _preferredTransport ? 0 : 1;
         }
     }
 }

CryptoExchange.Net/SharedApis/SharedApiRegistrationInfo.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace CryptoExchange.Net.SharedApis
+{
+    internal sealed class SharedApiRegistrationInfo
+    {
+        public Type SharedApiType { get; }
+        public Type[] BaseCapabilityTypes { get; }
+
+        public SharedApiRegistrationInfo(
+            Type sharedApiType,
+            Type[] baseCapabilityTypes)
+        {
+            SharedApiType = sharedApiType;
+            BaseCapabilityTypes = baseCapabilityTypes;
+        }
+    }
+}

CryptoExchange.Net/SharedApis/SharedUtils.cs

@@ -21,6 +21,8 @@ namespace CryptoExchange.Net.SharedApis
                 SupportedEnvironments = platformInfo.SupportedEnvironments,
                 SupportedTradingModes = client.SupportedTradingModes,
                 CentralizationType = platformInfo.CentralizationType,
+                Transport = client.Transport,
+                Authenticated = client.Authenticated,
                 Capabilities = client.Capabilities.Where(x => x.Supported).ToArray()
             };
         }