Added ActorReference creation from the ActorBase class informations (#1277)

* Handled creation of ActorReference from Actor base class

Signed-off-by: Manuel Menegazzo <manuel.menegazzo@outlook.com>

* Updated null check

Signed-off-by: Manuel Menegazzo <manuel.menegazzo@outlook.com>

* Added unit test for GetActorReference from null actore and actor proxy

Signed-off-by: Manuel Menegazzo <manuel.menegazzo@outlook.com>

* Added test for ActorReference created inside Actor implementation

Signed-off-by: Manuel Menegazzo <manuel.menegazzo@outlook.com>

* Updated description

Signed-off-by: Manuel Menegazzo <manuel.menegazzo@outlook.com>

* Fixed test method naming

Signed-off-by: Manuel Menegazzo <manuel.menegazzo@outlook.com>

* Added unit test for exception generated in case the type is not convertible to an ActorReference

Signed-off-by: Manuel Menegazzo <manuel.menegazzo@outlook.com>

---------

Signed-off-by: Manuel Menegazzo <manuel.menegazzo@outlook.com>

Author: m3nax

src/Dapr.Actors/ActorReference.cs

@@ -1,4 +1,4 @@
-// ------------------------------------------------------------------------
+// ------------------------------------------------------------------------
 // Copyright 2021 The Dapr Authors
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -16,6 +16,7 @@ namespace Dapr.Actors
     using System;
     using System.Runtime.Serialization;
     using Dapr.Actors.Client;
+    using Dapr.Actors.Runtime;
 
     /// <summary>
     /// Encapsulation of a reference to an actor for serialization.
@@ -69,23 +70,28 @@ public object Bind(Type actorInterfaceType)
 
         private static ActorReference GetActorReference(object actor)
         {
-            if (actor == null)
-            {
-                throw new ArgumentNullException("actor");
-            }
+            ArgumentNullException.ThrowIfNull(actor, nameof(actor));
 
-            // try as IActorProxy for backward compatibility as customers's mock framework may rely on it before V2 remoting stack.
-            if (actor is IActorProxy actorProxy)
+            var actorReference = actor switch
             {
-                return new ActorReference()
+                // try as IActorProxy for backward compatibility as customers's mock framework may rely on it before V2 remoting stack.
+                IActorProxy actorProxy => new ActorReference()
                 {
                     ActorId = actorProxy.ActorId,
                     ActorType = actorProxy.ActorType,
-                };
-            }
+                },
+                // Handle case when we want to get ActorReference inside the Actor implementation,
+                // we gather actor id and actor type from Actor base class.
+                Actor actorBase => new ActorReference()
+                {
+                    ActorId = actorBase.Id,
+                    ActorType = actorBase.Host.ActorTypeInfo.ActorTypeName,
+                },
+                // Handle case when we can't cast to IActorProxy or Actor.
+                _ => throw new ArgumentOutOfRangeException("actor", "Invalid actor object type."),
+            };
 
-            // TODO check for ActorBase
-            throw new ArgumentOutOfRangeException("actor");
+            return actorReference;
         }
     }
 }

test/Dapr.Actors.Test/ActorReferenceTests.cs

@@ -0,0 +1,93 @@
+using System;
+using System.Threading.Tasks;
+using Dapr.Actors.Client;
+using Dapr.Actors.Runtime;
+using Dapr.Actors.Test;
+using Xunit;
+
+namespace Dapr.Actors
+{
+    public class ActorReferenceTests
+    {
+        [Fact]
+        public void Get_WhenActorIsNull_ReturnsNull()
+        {
+            // Arrange
+            object actor = null;
+
+            // Act
+            var result = ActorReference.Get(actor);
+
+            // Assert
+            Assert.Null(result);
+        }
+
+        [Fact]
+        public void Get_FromActorProxy_ReturnsActorReference()
+        {
+            // Arrange
+            var expectedActorId = new ActorId("abc");
+            var expectedActorType = "TestActor";
+            var proxy = ActorProxy.Create(expectedActorId, typeof(ITestActor), expectedActorType);
+
+            // Act
+            var actorReference = ActorReference.Get(proxy);
+
+            // Assert
+            Assert.NotNull(actorReference);
+            Assert.Equal(expectedActorId, actorReference.ActorId);
+            Assert.Equal(expectedActorType, actorReference.ActorType);
+        }
+
+        [Fact]
+        public async Task Get_FromActorImplementation_ReturnsActorReference()
+        {
+            // Arrange
+            var expectedActorId = new ActorId("abc");
+            var expectedActorType = nameof(ActorReferenceTestActor);
+            var host = ActorHost.CreateForTest<ActorReferenceTestActor>(new ActorTestOptions() { ActorId = expectedActorId });
+            var actor = new ActorReferenceTestActor(host);
+
+            // Act
+            var actorReference = await actor.GetActorReference();
+
+            // Assert
+            Assert.NotNull(actorReference);
+            Assert.Equal(expectedActorId, actorReference.ActorId);
+            Assert.Equal(expectedActorType, actorReference.ActorType);
+        }
+
+        [Fact]
+        public void Get_WithInvalidObjectType_ThrowArgumentOutOfRangeException()
+        {
+            // Arrange
+            var actor = new object();
+
+            // Act
+            var act = () => ActorReference.Get(actor);
+
+            // Assert
+            var exception = Assert.Throws<ArgumentOutOfRangeException>(act);
+            Assert.Equal("actor", exception.ParamName);
+            Assert.Equal("Invalid actor object type. (Parameter 'actor')", exception.Message);
+        }
+    }
+
+    public interface IActorReferenceTestActor : IActor
+    {
+        Task<ActorReference> GetActorReference();
+    }
+
+    public class ActorReferenceTestActor : Actor, IActorReferenceTestActor
+    {
+        public ActorReferenceTestActor(ActorHost host)
+            : base(host)
+        {
+        }
+
+        public Task<ActorReference> GetActorReference()
+        {
+            return Task.FromResult(ActorReference.Get(this));
+        }
+    }
+}