Initial commit

RemoteExec.Client/RemoteExecutor.cs

@@ -0,0 +1,116 @@
+using Microsoft.AspNetCore.SignalR.Client;
+
+using RemoteExec.Shared;
+
+using System.Diagnostics.CodeAnalysis;
+using System.Reflection;
+using System.Text.Json;
+
+namespace RemoteExec.Client;
+
+public class RemoteExecutor(string url)
+{
+    private readonly HubConnection _connection =
+        new HubConnectionBuilder()
+            .WithUrl(url)
+            .WithAutomaticReconnect()
+            .Build();
+
+    public async Task StartAsync(CancellationToken cancellationToken = default)
+    {
+        await _connection.StartAsync(cancellationToken);
+    }
+
+    public bool TryExecute<TDelegate, TResult>(TDelegate del, out TResult? result, params object[] args) where TDelegate : Delegate
+    {
+        try
+        {
+            result = Execute<TDelegate, TResult>(del, args);
+            return true;
+        }
+        catch
+        {
+            result = default;
+            return false;
+        }
+    }
+
+    public bool TryExecute<TDelegate, TResult>(TDelegate del, out TResult? result, [NotNullWhen(false)] out Exception? exception, params object[] args) where TDelegate : Delegate
+    {
+        try
+        {
+            result = Execute<TDelegate, TResult>(del, args);
+            exception = null;
+            return true;
+        }
+        catch (Exception ex)
+        {
+            result = default;
+            exception = ex;
+            return false;
+        }
+    }
+
+    public TResult Execute<TDelegate, TResult>(TDelegate del, params object[] args) where TDelegate : Delegate
+    {
+        object? execResult = Execute(del, args);
+
+        if (execResult is TResult typedResult)
+        {
+            return typedResult;
+        }
+        else if (execResult is JsonElement jsonElement)
+        {
+            return jsonElement.Deserialize<TResult>()!;
+        }
+        else
+        {
+            throw new InvalidCastException("The result cannot be cast to the specified type.");
+        }
+    }
+
+    public object? Execute<T>(T del, params object[] args) where T : Delegate
+    {
+        MethodInfo method = del.Method;
+        Type declaringType = method.DeclaringType!;
+        Assembly asm = declaringType.Assembly;
+
+        if (!method.IsStatic)
+        {
+            throw new InvalidOperationException("Only static methods supported");
+        }
+
+        if (asm.IsDynamic)
+        {
+            throw new InvalidOperationException("Dynamic assemblies are not supported");
+        }
+
+        if (string.IsNullOrEmpty(asm.Location))
+        {
+            throw new InvalidOperationException("Assembly location is not available");
+        }
+
+        byte[] dllBytes = File.ReadAllBytes(asm.Location);
+
+        RemoteExecutionRequest request = new RemoteExecutionRequest
+        {
+            AssemblyBytes = dllBytes,
+            TypeName = declaringType.FullName!,
+            MethodName = method.Name,
+            ArgumentTypes = [.. method.GetParameters().Select(p => p.ParameterType.AssemblyQualifiedName!)],
+            Arguments = args
+        };
+
+        RemoteExecutionResult result = _connection
+            .InvokeAsync<RemoteExecutionResult>("Execute", request)
+            .GetAwaiter()
+            .GetResult();
+
+        if (result.Exception != null)
+        {
+            throw new RemoteExecutionException(result.Exception);
+        }
+
+        return result.Result;
+    }
+}