Added experimental fix for interface serialization

The communicator was failing to (de)serialize the communicator wrapper messages because it was unable to determine the type. I added a special converter for interfaces that includes the type name, so the serializer knows how to handle the JSON data.

Yggdrasil/Network/Communication/InterfaceConverter.cs

@@ -0,0 +1,78 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Yggdrasil.Network.Communication
+{
+	/// <summary>
+	/// A converter for interfaces.
+	/// </summary>
+	/// <typeparam name="T"></typeparam>
+	public class InterfaceConverter<T> : JsonConverter<T> where T : class
+	{
+		private const string TypePropertyName = "Type";
+		private const string DataPropertyName = "Data";
+
+		/// <summary>
+		/// Writes the value to the JSON writer.
+		/// </summary>
+		/// <param name="writer"></param>
+		/// <param name="value"></param>
+		/// <param name="options"></param>
+		public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
+		{
+			writer.WriteStartObject();
+			writer.WriteString(TypePropertyName, value.GetType().AssemblyQualifiedName);
+			writer.WritePropertyName(DataPropertyName);
+			JsonSerializer.Serialize(writer, value, value.GetType(), options);
+			writer.WriteEndObject();
+		}
+
+		/// <summary>
+		/// Reads a value from the JSON reader.
+		/// </summary>
+		/// <param name="reader"></param>
+		/// <param name="typeToConvert"></param>
+		/// <param name="options"></param>
+		/// <returns></returns>
+		/// <exception cref="JsonException"></exception>
+		public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+		{
+			if (reader.TokenType != JsonTokenType.StartObject)
+				throw new JsonException();
+
+			reader.Read(); // Object start
+
+			if (reader.TokenType != JsonTokenType.PropertyName || reader.GetString() != TypePropertyName)
+				throw new JsonException();
+
+			reader.Read(); // Property name
+
+			var typeName = reader.GetString();
+			var type = Type.GetType(typeName) ?? throw new JsonException($"Unable to find type: {typeName}");
+
+			reader.Read(); // Property name
+
+			if (reader.GetString() != DataPropertyName)
+				throw new JsonException();
+
+			reader.Read(); // Object start
+
+			var result = JsonSerializer.Deserialize(ref reader, type, options) as T;
+
+			reader.Read(); // Object end
+
+			return result;
+		}
+
+		/// <summary>
+		/// Determines whether the specified type can be converted.
+		/// </summary>
+		/// <param name="typeToConvert"></param>
+		/// <returns></returns>
+		public override bool CanConvert(Type typeToConvert)
+		{
+			return typeof(T).IsAssignableFrom(typeToConvert);
+		}
+	}
+}

Yggdrasil/Network/Communication/Messages/BroadcastMessage.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Text.Json.Serialization;
 
 namespace Yggdrasil.Network.Communication.Messages
 {
@@ -16,6 +17,7 @@ public class BroadcastMessage : ICommMessage
 		/// <summary>
 		/// Returns the message to be broadcasted.
 		/// </summary>
+		[JsonConverter(typeof(InterfaceConverter<ICommMessage>))]
 		public ICommMessage Message { get; }
 
 		/// <summary>

Yggdrasil/Network/Communication/Messages/RequestMessage.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Text.Json.Serialization;
 using System.Threading;
 
 namespace Yggdrasil.Network.Communication.Messages
@@ -19,6 +20,7 @@ public class RequestMessage : ICommMessage
 		/// <summary>
 		/// Returns the message that a response is requested for.
 		/// </summary>
+		[JsonConverter(typeof(InterfaceConverter<ICommMessage>))]
 		public ICommMessage Message { get; }
 
 		/// <summary>

Yggdrasil/Network/Communication/Messages/ResponseMessage.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Text.Json.Serialization;
 
 namespace Yggdrasil.Network.Communication.Messages
 {
@@ -16,6 +17,7 @@ public class ResponseMessage : ICommMessage
 		/// <summary>
 		/// Returns the actual response message.
 		/// </summary>
+		[JsonConverter(typeof(InterfaceConverter<ICommMessage>))]
 		public ICommMessage Message { get; }
 
 		/// <summary>

Yggdrasil/Yggdrasil.csproj

@@ -13,7 +13,7 @@
     <GenerateDocumentationFile>True</GenerateDocumentationFile>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
     <Title>$(AssemblyName)</Title>
-    <Version>1.0.3</Version>
+    <Version>1.0.4</Version>
     <Authors>exec</Authors>
     <Description>Game server and emulation library.</Description>
     <RepositoryUrl>https://github.com/exectails/Yggdrasil</RepositoryUrl>