Add "servermods" folder to ignored folders in backups

.gitignore

@@ -192,6 +192,7 @@ ClientBin/
 *.dbmdl
 *.dbproj.schemaview
 *.jfm
+*.pfx
 *.publishsettings
 orleans.codegen.cs
 

.run/Agent 1.run.xml

@@ -5,7 +5,7 @@
     <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/.workdir/Agent1" />
     <option name="PASS_PARENT_ENVS" value="1" />
     <envs>
-      <env name="AGENT_KEY" value="K5ZRZYYJ9GWM2FS6XH5N5QQ7WZRPNDGHYMN5QP7RP6PPY27KRPMSYGCN" />
+      <env name="AGENT_KEY" value="JXBQQYG5T267RQS75MXWBTCJZY5CKTCCGQY22MCZPHSQQSJYCHH2NG2TCNXQY6TBSXM9NQDRS2CMX" />
       <env name="AGENT_NAME" value="Agent 1" />
       <env name="ALLOWED_RCON_PORTS" value="25575,27000,27001" />
       <env name="ALLOWED_SERVER_PORTS" value="25565,26000,26001" />
@@ -15,19 +15,14 @@
       <env name="MAX_MEMORY" value="12G" />
     </envs>
     <option name="USE_EXTERNAL_CONSOLE" value="0" />
-    <option name="ENV_FILE_PATHS" value="" />
-    <option name="REDIRECT_INPUT_PATH" value="" />
-    <option name="PTY_MODE" value="Auto" />
     <option name="USE_MONO" value="0" />
     <option name="RUNTIME_ARGUMENTS" value="" />
-    <option name="AUTO_ATTACH_CHILDREN" value="0" />
-    <option name="MIXED_MODE_DEBUG" value="0" />
     <option name="PROJECT_PATH" value="$PROJECT_DIR$/Agent/Phantom.Agent/Phantom.Agent.csproj" />
     <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
     <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
     <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="0" />
     <option name="PROJECT_KIND" value="DotNetCore" />
-    <option name="PROJECT_TFM" value="net9.0" />
+    <option name="PROJECT_TFM" value="net8.0" />
     <method v="2">
       <option name="Build" />
     </method>

.run/Agent 2.run.xml

@@ -5,7 +5,7 @@
     <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/.workdir/Agent2" />
     <option name="PASS_PARENT_ENVS" value="1" />
     <envs>
-      <env name="AGENT_KEY" value="K5ZRZYYJ9GWM2FS6XH5N5QQ7WZRPNDGHYMN5QP7RP6PPY27KRPMSYGCN" />
+      <env name="AGENT_KEY" value="JXBQQYG5T267RQS75MXWBTCJZY5CKTCCGQY22MCZPHSQQSJYCHH2NG2TCNXQY6TBSXM9NQDRS2CMX" />
       <env name="AGENT_NAME" value="Agent 2" />
       <env name="ALLOWED_RCON_PORTS" value="27002-27006" />
       <env name="ALLOWED_SERVER_PORTS" value="26002-26006" />
@@ -15,19 +15,14 @@
       <env name="MAX_MEMORY" value="10G" />
     </envs>
     <option name="USE_EXTERNAL_CONSOLE" value="0" />
-    <option name="ENV_FILE_PATHS" value="" />
-    <option name="REDIRECT_INPUT_PATH" value="" />
-    <option name="PTY_MODE" value="Auto" />
     <option name="USE_MONO" value="0" />
     <option name="RUNTIME_ARGUMENTS" value="" />
-    <option name="AUTO_ATTACH_CHILDREN" value="0" />
-    <option name="MIXED_MODE_DEBUG" value="0" />
     <option name="PROJECT_PATH" value="$PROJECT_DIR$/Agent/Phantom.Agent/Phantom.Agent.csproj" />
     <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
     <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
     <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="0" />
     <option name="PROJECT_KIND" value="DotNetCore" />
-    <option name="PROJECT_TFM" value="net9.0" />
+    <option name="PROJECT_TFM" value="net8.0" />
     <method v="2">
       <option name="Build" />
     </method>

.run/Agent 3.run.xml

@@ -5,7 +5,7 @@
     <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/.workdir/Agent3" />
     <option name="PASS_PARENT_ENVS" value="1" />
     <envs>
-      <env name="AGENT_KEY" value="K5ZRZYYJ9GWM2FS6XH5N5QQ7WZRPNDGHYMN5QP7RP6PPY27KRPMSYGCN" />
+      <env name="AGENT_KEY" value="JXBQQYG5T267RQS75MXWBTCJZY5CKTCCGQY22MCZPHSQQSJYCHH2NG2TCNXQY6TBSXM9NQDRS2CMX" />
       <env name="AGENT_NAME" value="Agent 3" />
       <env name="ALLOWED_RCON_PORTS" value="27007" />
       <env name="ALLOWED_SERVER_PORTS" value="26007" />
@@ -15,19 +15,14 @@
       <env name="MAX_MEMORY" value="2560M" />
     </envs>
     <option name="USE_EXTERNAL_CONSOLE" value="0" />
-    <option name="ENV_FILE_PATHS" value="" />
-    <option name="REDIRECT_INPUT_PATH" value="" />
-    <option name="PTY_MODE" value="Auto" />
     <option name="USE_MONO" value="0" />
     <option name="RUNTIME_ARGUMENTS" value="" />
-    <option name="AUTO_ATTACH_CHILDREN" value="0" />
-    <option name="MIXED_MODE_DEBUG" value="0" />
     <option name="PROJECT_PATH" value="$PROJECT_DIR$/Agent/Phantom.Agent/Phantom.Agent.csproj" />
     <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
     <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
     <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="0" />
     <option name="PROJECT_KIND" value="DotNetCore" />
-    <option name="PROJECT_TFM" value="net9.0" />
+    <option name="PROJECT_TFM" value="net8.0" />
     <method v="2">
       <option name="Build" />
     </method>

.run/Controller.run.xml

@@ -14,19 +14,14 @@
       <env name="WEB_RPC_SERVER_HOST" value="localhost" />
     </envs>
     <option name="USE_EXTERNAL_CONSOLE" value="0" />
-    <option name="ENV_FILE_PATHS" value="" />
-    <option name="REDIRECT_INPUT_PATH" value="" />
-    <option name="PTY_MODE" value="Auto" />
     <option name="USE_MONO" value="0" />
     <option name="RUNTIME_ARGUMENTS" value="" />
-    <option name="AUTO_ATTACH_CHILDREN" value="0" />
-    <option name="MIXED_MODE_DEBUG" value="0" />
     <option name="PROJECT_PATH" value="$PROJECT_DIR$/Controller/Phantom.Controller/Phantom.Controller.csproj" />
     <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
     <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
     <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="0" />
     <option name="PROJECT_KIND" value="DotNetCore" />
-    <option name="PROJECT_TFM" value="net9.0" />
+    <option name="PROJECT_TFM" value="net8.0" />
     <method v="2">
       <option name="Build" />
     </method>

.run/Web.run.xml

@@ -7,23 +7,18 @@
     <envs>
       <env name="ASPNETCORE_ENVIRONMENT" value="Development" />
       <env name="CONTROLLER_HOST" value="localhost" />
-      <env name="WEB_KEY" value="T5Y722D2GZBXT2H27QS95P2YQRFB2GCTKHSWT5CZFDTFKW52TCM9GDRW" />
+      <env name="WEB_KEY" value="BMNHM9RRPMCBBY29D9XHS6KBKZSRY7F5XFN27YZX96XXWJC2NM2D6YRHM9PZN9JGQGCSJ6FMB2GGZ" />
       <env name="WEB_SERVER_HOST" value="localhost" />
     </envs>
     <option name="USE_EXTERNAL_CONSOLE" value="0" />
-    <option name="ENV_FILE_PATHS" value="" />
-    <option name="REDIRECT_INPUT_PATH" value="" />
-    <option name="PTY_MODE" value="Auto" />
     <option name="USE_MONO" value="0" />
     <option name="RUNTIME_ARGUMENTS" value="" />
-    <option name="AUTO_ATTACH_CHILDREN" value="0" />
-    <option name="MIXED_MODE_DEBUG" value="0" />
     <option name="PROJECT_PATH" value="$PROJECT_DIR$/Web/Phantom.Web/Phantom.Web.csproj" />
     <option name="PROJECT_EXE_PATH_TRACKING" value="1" />
     <option name="PROJECT_ARGUMENTS_TRACKING" value="1" />
     <option name="PROJECT_WORKING_DIRECTORY_TRACKING" value="0" />
     <option name="PROJECT_KIND" value="DotNetCore" />
-    <option name="PROJECT_TFM" value="net9.0" />
+    <option name="PROJECT_TFM" value="net8.0" />
     <method v="2">
       <option name="Build" />
     </method>

.workdir/Controller/secrets/agent.auth

@@ -1 +0,0 @@
-满<EFBFBD>H<EFBFBD>c<EFBFBD>og<EFBFBD>

.workdir/Controller/secrets/agent.secret

@@ -0,0 +1 @@
+<EFBFBD>Z<EFBFBD>t<>MPI<49>GMZ<4D><5A><EFBFBD><EFBFBD>kN<6B>VF1X<><58>p

.workdir/Controller/secrets/web.auth

@@ -1 +0,0 @@
-<07>U<EFBFBD>/<2F><04><><EFBFBD>q

.workdir/Controller/secrets/web.key

@@ -0,0 +1,2 @@
+<EFBFBD><EFBFBD>h?Ο<05>Bx
+<02>

.workdir/Controller/secrets/web.secret

@@ -0,0 +1 @@
+T<EFBFBD>./g<11><>N<EFBFBD><4E>t<EFBFBD>$<24>!<21>(<28><>#<23>~<7E><>}<14><:

Agent/Phantom.Agent.Minecraft/Launcher/BaseLauncher.cs

@@ -1,4 +1,5 @@
-using System.Text;
+using System.Collections.ObjectModel;
+using System.Text;
 using Phantom.Agent.Minecraft.Instance;
 using Phantom.Agent.Minecraft.Java;
 using Phantom.Agent.Minecraft.Server;
@@ -11,6 +12,7 @@ public abstract class BaseLauncher : IServerLauncher {
 	private readonly InstanceProperties instanceProperties;
 
 	protected string MinecraftVersion => instanceProperties.ServerVersion;
+	protected string InstanceFolder => instanceProperties.InstanceFolder;
 
 	private protected BaseLauncher(InstanceProperties instanceProperties) {
 		this.instanceProperties = instanceProperties;
@@ -51,16 +53,14 @@ public abstract class BaseLauncher : IServerLauncher {
 		
 		var processConfigurator = new ProcessConfigurator {
 			FileName = javaRuntimeExecutable.ExecutablePath,
-			WorkingDirectory = instanceProperties.InstanceFolder,
+			WorkingDirectory = InstanceFolder,
 			RedirectInput = true,
 			UseShellExecute = false
 		};
 		
 		var processArguments = processConfigurator.ArgumentList;
 		PrepareJvmArguments(serverJar).Build(processArguments);
-		processArguments.Add("-jar");
+		PrepareJavaProcessArguments(processArguments, serverJar.FilePath);
-		processArguments.Add(serverJar.FilePath);
-		processArguments.Add("nogui");
 
 		var process = processConfigurator.CreateProcess();
 		var instanceProcess = new InstanceProcess(instanceProperties, process);
@@ -99,6 +99,12 @@ public abstract class BaseLauncher : IServerLauncher {
 
 	private protected virtual void CustomizeJvmArguments(JvmArgumentBuilder arguments) {}
 
+	protected virtual void PrepareJavaProcessArguments(Collection<string> processArguments, string serverJarFilePath) {
+		processArguments.Add("-jar");
+		processArguments.Add(serverJarFilePath);
+		processArguments.Add("nogui");
+	}
+
 	private protected virtual Task<ServerJarInfo> PrepareServerJar(ILogger logger, string serverJarPath, CancellationToken cancellationToken) {
 		return Task.FromResult(new ServerJarInfo(serverJarPath));
 	}

Agent/Phantom.Agent.Minecraft/Launcher/Types/ForgeLauncher.cs

@@ -0,0 +1,29 @@
+using System.Collections.ObjectModel;
+using Phantom.Agent.Minecraft.Instance;
+using Phantom.Agent.Minecraft.Java;
+using Serilog;
+
+namespace Phantom.Agent.Minecraft.Launcher.Types; 
+
+public sealed class ForgeLauncher : BaseLauncher {
+	public ForgeLauncher(InstanceProperties instanceProperties) : base(instanceProperties) {}
+	
+	private protected override void CustomizeJvmArguments(JvmArgumentBuilder arguments) {
+		arguments.AddProperty("terminal.ansi", "true"); // TODO
+	}
+
+	protected override void PrepareJavaProcessArguments(Collection<string> processArguments, string serverJarFilePath) {
+		if (OperatingSystem.IsWindows()) {
+			processArguments.Add("@libraries/net/minecraftforge/forge/1.20.1-47.2.0/win_args.txt");
+		}
+		else {
+			processArguments.Add("@libraries/net/minecraftforge/forge/1.20.1-47.2.0/unix_args.txt");
+		}
+		
+		processArguments.Add("nogui");
+	}
+
+	private protected override Task<ServerJarInfo> PrepareServerJar(ILogger logger, string serverJarPath, CancellationToken cancellationToken) {
+		return Task.FromResult(new ServerJarInfo(Path.Combine(InstanceFolder, "run.sh")));
+	}
+}

Agent/Phantom.Agent.Rpc/ControllerConnection.cs

@@ -0,0 +1,21 @@
+using Phantom.Common.Messages.Agent;
+using Phantom.Utils.Logging;
+using Phantom.Utils.Rpc.Runtime;
+using Serilog;
+
+namespace Phantom.Agent.Rpc;
+
+public sealed class ControllerConnection {
+	private static readonly ILogger Logger = PhantomLogger.Create(nameof(ControllerConnection));
+
+	private readonly RpcConnectionToServer<IMessageToController> connection;
+	
+	public ControllerConnection(RpcConnectionToServer<IMessageToController> connection) {
+		this.connection = connection;
+		Logger.Information("Connection ready.");
+	}
+
+	public Task Send<TMessage>(TMessage message) where TMessage : IMessageToController {
+		return connection.Send(message);
+	}
+}

Agent/Phantom.Agent.Rpc/KeepAliveLoop.cs

@@ -0,0 +1,44 @@
+using Phantom.Common.Messages.Agent;
+using Phantom.Common.Messages.Agent.ToController;
+using Phantom.Utils.Logging;
+using Phantom.Utils.Rpc.Runtime;
+using Serilog;
+
+namespace Phantom.Agent.Rpc;
+
+sealed class KeepAliveLoop {
+	private static readonly ILogger Logger = PhantomLogger.Create<KeepAliveLoop>();
+
+	private static readonly TimeSpan KeepAliveInterval = TimeSpan.FromSeconds(10);
+
+	private readonly RpcConnectionToServer<IMessageToController> connection;
+	private readonly CancellationTokenSource cancellationTokenSource = new ();
+
+	public KeepAliveLoop(RpcConnectionToServer<IMessageToController> connection) {
+		this.connection = connection;
+		Task.Run(Run);
+	}
+
+	private async Task Run() {
+		var cancellationToken = cancellationTokenSource.Token;
+		
+		try {
+			await connection.IsReady.WaitAsync(cancellationToken);
+			Logger.Information("Started keep-alive loop.");
+			
+			while (true) {
+				await Task.Delay(KeepAliveInterval, cancellationToken);
+				await connection.Send(new AgentIsAliveMessage()).WaitAsync(cancellationToken);
+			}
+		} catch (OperationCanceledException) {
+			// Ignore.
+		} finally {
+			cancellationTokenSource.Dispose();
+			Logger.Information("Stopped keep-alive loop.");
+		}
+	}
+
+	public void Cancel() {
+		cancellationTokenSource.Cancel();
+	}
+}

Agent/Phantom.Agent.Rpc/Phantom.Agent.Rpc.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  
+  <PropertyGroup>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  
+  <ItemGroup>
+    <ProjectReference Include="..\..\Common\Phantom.Common.Messages.Agent\Phantom.Common.Messages.Agent.csproj" />
+  </ItemGroup>
+
+</Project>

Agent/Phantom.Agent.Rpc/RpcClientRuntime.cs

@@ -0,0 +1,37 @@
+using NetMQ;
+using NetMQ.Sockets;
+using Phantom.Common.Messages.Agent;
+using Phantom.Common.Messages.Agent.BiDirectional;
+using Phantom.Common.Messages.Agent.ToController;
+using Phantom.Utils.Actor;
+using Phantom.Utils.Rpc.Runtime;
+using Phantom.Utils.Rpc.Sockets;
+using Serilog;
+
+namespace Phantom.Agent.Rpc;
+
+public sealed class RpcClientRuntime : RpcClientRuntime<IMessageToAgent, IMessageToController, ReplyMessage> {
+	public static Task Launch(RpcClientSocket<IMessageToAgent, IMessageToController, ReplyMessage> socket, ActorRef<IMessageToAgent> handlerActorRef, SemaphoreSlim disconnectSemaphore, CancellationToken receiveCancellationToken) {
+		return new RpcClientRuntime(socket, handlerActorRef, disconnectSemaphore, receiveCancellationToken).Launch();
+	}
+
+	private RpcClientRuntime(RpcClientSocket<IMessageToAgent, IMessageToController, ReplyMessage> socket, ActorRef<IMessageToAgent> handlerActor, SemaphoreSlim disconnectSemaphore, CancellationToken receiveCancellationToken) : base(socket, handlerActor, disconnectSemaphore, receiveCancellationToken) {}
+
+	protected override async Task RunWithConnection(ClientSocket socket, RpcConnectionToServer<IMessageToController> connection) {
+		var keepAliveLoop = new KeepAliveLoop(connection);
+		try {
+			await base.RunWithConnection(socket, connection);
+		} finally {
+			keepAliveLoop.Cancel();
+		}
+	}
+
+	protected override async Task SendDisconnectMessage(ClientSocket socket, ILogger logger) {
+		var unregisterMessageBytes = AgentMessageRegistries.ToController.Write(new UnregisterAgentMessage()).ToArray();
+		try {
+			await socket.SendAsync(unregisterMessageBytes).AsTask().WaitAsync(TimeSpan.FromSeconds(5), CancellationToken.None);
+		} catch (TimeoutException) {
+			logger.Error("Timed out communicating agent shutdown with the controller.");
+		}
+	}
+}

Agent/Phantom.Agent.Services/AgentServices.cs

@@ -1,13 +1,9 @@
-using System.Collections.Immutable;
+using Akka.Actor;
-using Akka.Actor;
 using Phantom.Agent.Minecraft.Java;
+using Phantom.Agent.Rpc;
 using Phantom.Agent.Services.Backups;
 using Phantom.Agent.Services.Instances;
-using Phantom.Agent.Services.Rpc;
 using Phantom.Common.Data.Agent;
-using Phantom.Common.Data.Replies;
-using Phantom.Common.Messages.Agent.ToAgent;
-using Phantom.Common.Messages.Agent.ToController;
 using Phantom.Utils.Actor;
 using Phantom.Utils.Logging;
 using Serilog;
@@ -19,7 +15,6 @@ public sealed class AgentServices {
 	
 	public ActorSystem ActorSystem { get; }
 
-	private AgentInfo AgentInfo { get; }
 	private AgentFolders AgentFolders { get; }
 	private AgentState AgentState { get; }
 	private BackupManager BackupManager { get; }
@@ -31,7 +26,6 @@ public sealed class AgentServices {
 	public AgentServices(AgentInfo agentInfo, AgentFolders agentFolders, AgentServiceConfiguration serviceConfiguration, ControllerConnection controllerConnection) {
 		this.ActorSystem = ActorSystemFactory.Create("Agent");
 		
-		this.AgentInfo = agentInfo;
 		this.AgentFolders = agentFolders;
 		this.AgentState = new AgentState();
 		this.BackupManager = new BackupManager(agentFolders, serviceConfiguration.MaxConcurrentCompressionTasks);
@@ -49,39 +43,6 @@ public sealed class AgentServices {
 		}
 	}
 
-	public  async Task<bool> Register(ControllerConnection connection, CancellationToken cancellationToken) {
-		Logger.Information("Registering with the controller...");
-		
-		ImmutableArray<ConfigureInstanceMessage> configureInstanceMessages;
-		try {
-			configureInstanceMessages = await connection.Send<RegisterAgentMessage, ImmutableArray<ConfigureInstanceMessage>>(new RegisterAgentMessage(AgentInfo), TimeSpan.FromMinutes(1), cancellationToken);
-		} catch (Exception e) {
-			Logger.Fatal(e, "Registration failed.");
-			return false;
-		}
-		
-		foreach (var configureInstanceMessage in configureInstanceMessages) {
-			var configureInstanceCommand = new InstanceManagerActor.ConfigureInstanceCommand(
-				configureInstanceMessage.InstanceGuid,
-				configureInstanceMessage.Configuration,
-				configureInstanceMessage.LaunchProperties,
-				configureInstanceMessage.LaunchNow,
-				AlwaysReportStatus: true
-			);
-			
-			var configureInstanceResult = await InstanceManager.Request(configureInstanceCommand, cancellationToken);
-			if (!configureInstanceResult.Is(ConfigureInstanceResult.Success)) {
-				Logger.Fatal("Unable to configure instance \"{Name}\" (GUID {Guid}), shutting down.", configureInstanceMessage.Configuration.InstanceName, configureInstanceMessage.InstanceGuid);
-				return false;
-			}
-		}
-		
-		await connection.Send(new AdvertiseJavaRuntimesMessage(JavaRuntimeRepository.All), cancellationToken);
-		InstanceTicketManager.RefreshAgentStatus();
-		
-		return true;
-	}
-	
 	public async Task Shutdown() {
 		Logger.Information("Stopping services...");
 		

Agent/Phantom.Agent.Services/Backups/BackupArchiver.cs

@@ -25,7 +25,7 @@ sealed class BackupArchiver {
 	}
 
 	private bool IsFolderSkipped(ImmutableList<string> relativePath) {
-		return relativePath is ["cache" or "crash-reports" or "debug" or "libraries" or "logs" or "mods" or "versions"];
+		return relativePath is ["cache" or "crash-reports" or "debug" or "libraries" or "logs" or "mods" or "servermods" or "versions"];
 	}
 	
 	[SuppressMessage("ReSharper", "ConvertIfStatementToReturnStatement")]

Agent/Phantom.Agent.Services/Instances/InstanceActor.cs

@@ -58,7 +58,7 @@ sealed class InstanceActor : ReceiveActor<InstanceActor.ICommand> {
 
 	private void ReportCurrentStatus() {
 		agentState.UpdateInstance(new Instance(instanceGuid, currentStatus));
-		instanceServices.ControllerConnection.TrySend(new ReportInstanceStatusMessage(instanceGuid, currentStatus));
+		instanceServices.ControllerConnection.Send(new ReportInstanceStatusMessage(instanceGuid, currentStatus));
 	}
 
 	private void TransitionState(InstanceRunningState? newState) {

Agent/Phantom.Agent.Services/Instances/InstanceContext.cs

@@ -7,6 +7,6 @@ namespace Phantom.Agent.Services.Instances;
 
 sealed record InstanceContext(Guid InstanceGuid, string ShortName, ILogger Logger, InstanceServices Services, ActorRef<InstanceActor.ICommand> Actor, CancellationToken ActorCancellationToken) {
 	public void ReportEvent(IInstanceEvent instanceEvent) {
-		Services.ControllerConnection.TrySend(new ReportInstanceEventMessage(Guid.NewGuid(), DateTime.UtcNow, InstanceGuid, instanceEvent));
+		Services.ControllerConnection.Send(new ReportInstanceEventMessage(Guid.NewGuid(), DateTime.UtcNow, InstanceGuid, instanceEvent));
 	}
 }

Agent/Phantom.Agent.Services/Instances/InstanceManagerActor.cs

@@ -4,8 +4,8 @@ using Phantom.Agent.Minecraft.Launcher;
 using Phantom.Agent.Minecraft.Launcher.Types;
 using Phantom.Agent.Minecraft.Properties;
 using Phantom.Agent.Minecraft.Server;
+using Phantom.Agent.Rpc;
 using Phantom.Agent.Services.Backups;
-using Phantom.Agent.Services.Rpc;
 using Phantom.Common.Data;
 using Phantom.Common.Data.Instance;
 using Phantom.Common.Data.Minecraft;
@@ -102,6 +102,7 @@ sealed class InstanceManagerActor : ReceiveActor<InstanceManagerActor.ICommand>
 		IServerLauncher launcher = configuration.MinecraftServerKind switch {
 			MinecraftServerKind.Vanilla => new VanillaLauncher(properties),
 			MinecraftServerKind.Fabric  => new FabricLauncher(properties),
+			MinecraftServerKind.Forge   => new ForgeLauncher(properties),
 			_                           => InvalidLauncher.Instance
 		};
 

Agent/Phantom.Agent.Services/Instances/InstanceServices.cs

@@ -1,6 +1,6 @@
 using Phantom.Agent.Minecraft.Launcher;
+using Phantom.Agent.Rpc;
 using Phantom.Agent.Services.Backups;
-using Phantom.Agent.Services.Rpc;
 
 namespace Phantom.Agent.Services.Instances;
 

Agent/Phantom.Agent.Services/Instances/InstanceTicketManager.cs

@@ -1,10 +1,11 @@
-using Phantom.Agent.Services.Rpc;
+using Phantom.Agent.Rpc;
 using Phantom.Common.Data;
 using Phantom.Common.Data.Agent;
 using Phantom.Common.Data.Instance;
 using Phantom.Common.Data.Replies;
 using Phantom.Common.Messages.Agent.ToController;
 using Phantom.Utils.Logging;
+using Phantom.Utils.Tasks;
 using Serilog;
 
 namespace Phantom.Agent.Services.Instances;
@@ -91,7 +92,7 @@ sealed class InstanceTicketManager {
 	
 	public void RefreshAgentStatus() {
 		lock (this) {
-			controllerConnection.TrySend(new ReportAgentStatusMessage(activeTicketGuids.Count, usedMemory));
+			controllerConnection.Send(new ReportAgentStatusMessage(activeTicketGuids.Count, usedMemory));
 		}
 	}
 	

Agent/Phantom.Agent.Services/Instances/State/InstanceLogSender.cs

@@ -1,6 +1,6 @@
 using System.Collections.Immutable;
 using System.Threading.Channels;
-using Phantom.Agent.Services.Rpc;
+using Phantom.Agent.Rpc;
 using Phantom.Common.Messages.Agent.ToController;
 using Phantom.Utils.Logging;
 using Phantom.Utils.Tasks;
@@ -63,7 +63,7 @@ sealed class InstanceLogSender : CancellableBackgroundTask {
 
 	private void SendOutputToServer(ImmutableArray<string> lines) {
 		if (!lines.IsEmpty) {
-			controllerConnection.TrySend(new InstanceOutputMessage(instanceGuid, lines));
+			controllerConnection.Send(new InstanceOutputMessage(instanceGuid, lines));
 		}
 	}
 

Agent/Phantom.Agent.Services/Instances/State/InstancePlayerCountTracker.cs

@@ -1,6 +1,6 @@
 using Phantom.Agent.Minecraft.Instance;
 using Phantom.Agent.Minecraft.Server;
-using Phantom.Agent.Services.Rpc;
+using Phantom.Agent.Rpc;
 using Phantom.Common.Data.Instance;
 using Phantom.Common.Messages.Agent.ToController;
 using Phantom.Utils.Logging;
@@ -38,7 +38,7 @@ sealed class InstancePlayerCountTracker : CancellableBackgroundTask {
 			}
 
 			onlinePlayerCountChanged?.Invoke(this, value?.Online);
-			controllerConnection.TrySend(new ReportInstancePlayerCountsMessage(instanceGuid, value));
+			controllerConnection.Send(new ReportInstancePlayerCountsMessage(instanceGuid, value));
 		}
 	}
 

Agent/Phantom.Agent.Services/Phantom.Agent.Services.csproj

@@ -8,6 +8,7 @@
   <ItemGroup>
     <ProjectReference Include="..\..\Common\Phantom.Common.Messages.Agent\Phantom.Common.Messages.Agent.csproj" />
     <ProjectReference Include="..\Phantom.Agent.Minecraft\Phantom.Agent.Minecraft.csproj" />
+    <ProjectReference Include="..\Phantom.Agent.Rpc\Phantom.Agent.Rpc.csproj" />
   </ItemGroup>
 
 </Project>

Agent/Phantom.Agent.Services/Rpc/ControllerConnection.cs

@@ -1,20 +0,0 @@
-using Phantom.Common.Messages.Agent;
-using Phantom.Utils.Actor;
-using Phantom.Utils.Rpc.Runtime;
-
-namespace Phantom.Agent.Services.Rpc;
-
-public sealed class ControllerConnection(RpcSendChannel<IMessageToController> sendChannel) {
-	public ValueTask Send<TMessage>(TMessage message, CancellationToken cancellationToken) where TMessage : IMessageToController {
-		return sendChannel.SendMessage(message, cancellationToken);
-	}
-	
-	// TODO handle properly
-	public bool TrySend<TMessage>(TMessage message) where TMessage : IMessageToController {
-		return sendChannel.TrySendMessage(message);
-	}
-	
-	public Task<TReply> Send<TMessage, TReply>(TMessage message, TimeSpan waitForReplyTime, CancellationToken cancellationToken) where TMessage : IMessageToController, ICanReply<TReply> {
-		return sendChannel.SendMessage<TMessage, TReply>(message, waitForReplyTime, cancellationToken);
-	}
-}

Agent/Phantom.Agent.Services/Rpc/ControllerMessageHandlerActor.cs

@@ -1,32 +1,86 @@
 using Phantom.Agent.Services.Instances;
 using Phantom.Common.Data;
+using Phantom.Common.Data.Instance;
 using Phantom.Common.Data.Replies;
 using Phantom.Common.Messages.Agent;
+using Phantom.Common.Messages.Agent.BiDirectional;
 using Phantom.Common.Messages.Agent.ToAgent;
+using Phantom.Common.Messages.Agent.ToController;
 using Phantom.Utils.Actor;
+using Phantom.Utils.Logging;
+using Phantom.Utils.Rpc.Runtime;
+using Serilog;
 
 namespace Phantom.Agent.Services.Rpc;
 
 public sealed class ControllerMessageHandlerActor : ReceiveActor<IMessageToAgent> {
-	public readonly record struct Init(AgentServices Agent);
+	private static ILogger Logger { get; } = PhantomLogger.Create<ControllerMessageHandlerActor>();
+
+	public readonly record struct Init(RpcConnectionToServer<IMessageToController> Connection, AgentServices Agent, CancellationTokenSource ShutdownTokenSource);
 	
 	public static Props<IMessageToAgent> Factory(Init init) {
 		return Props<IMessageToAgent>.Create(() => new ControllerMessageHandlerActor(init), new ActorConfiguration { SupervisorStrategy = SupervisorStrategies.Resume });
 	}
 	
+	private readonly RpcConnectionToServer<IMessageToController> connection;
 	private readonly AgentServices agent;
+	private readonly CancellationTokenSource shutdownTokenSource;
 
 	private ControllerMessageHandlerActor(Init init) {
+		this.connection = init.Connection;
 		this.agent = init.Agent;
+		this.shutdownTokenSource = init.ShutdownTokenSource;
 		
+		ReceiveAsync<RegisterAgentSuccessMessage>(HandleRegisterAgentSuccess);
+		Receive<RegisterAgentFailureMessage>(HandleRegisterAgentFailure);
 		ReceiveAndReplyLater<ConfigureInstanceMessage, Result<ConfigureInstanceResult, InstanceActionFailure>>(HandleConfigureInstance);
 		ReceiveAndReplyLater<LaunchInstanceMessage, Result<LaunchInstanceResult, InstanceActionFailure>>(HandleLaunchInstance);
 		ReceiveAndReplyLater<StopInstanceMessage, Result<StopInstanceResult, InstanceActionFailure>>(HandleStopInstance);
 		ReceiveAndReplyLater<SendCommandToInstanceMessage, Result<SendCommandToInstanceResult, InstanceActionFailure>>(HandleSendCommandToInstance);
+		Receive<ReplyMessage>(HandleReply);
+	}
+
+	private async Task HandleRegisterAgentSuccess(RegisterAgentSuccessMessage message) {
+		Logger.Information("Agent authentication successful.");
+
+		void ShutdownAfterConfigurationFailed(Guid instanceGuid, InstanceConfiguration configuration) {
+			Logger.Fatal("Unable to configure instance \"{Name}\" (GUID {Guid}), shutting down.", configuration.InstanceName, instanceGuid);
+			shutdownTokenSource.Cancel();
+		}
+		
+		foreach (var configureInstanceMessage in message.InitialInstanceConfigurations) {
+			var result = await HandleConfigureInstance(configureInstanceMessage, alwaysReportStatus: true);
+			if (!result.Is(ConfigureInstanceResult.Success)) {
+				ShutdownAfterConfigurationFailed(configureInstanceMessage.InstanceGuid, configureInstanceMessage.Configuration);
+				return;
+			}
+		}
+
+		connection.SetIsReady();
+		
+		await connection.Send(new AdvertiseJavaRuntimesMessage(agent.JavaRuntimeRepository.All));
+		agent.InstanceTicketManager.RefreshAgentStatus();
+	}
+
+	private void HandleRegisterAgentFailure(RegisterAgentFailureMessage message) {
+		string errorMessage = message.FailureKind switch {
+			RegisterAgentFailure.ConnectionAlreadyHasAnAgent => "This connection already has an associated agent.",
+			RegisterAgentFailure.InvalidToken                => "Invalid token.",
+			_                                                => "Unknown error " + (byte) message.FailureKind + "."
+		};
+
+		Logger.Fatal("Agent authentication failed: {Error}", errorMessage);
+		
+		PhantomLogger.Dispose();
+		Environment.Exit(1);
+	}
+	
+	private Task<Result<ConfigureInstanceResult, InstanceActionFailure>> HandleConfigureInstance(ConfigureInstanceMessage message, bool alwaysReportStatus) {
+		return agent.InstanceManager.Request(new InstanceManagerActor.ConfigureInstanceCommand(message.InstanceGuid, message.Configuration, message.LaunchProperties, message.LaunchNow, alwaysReportStatus));
 	}
 	
 	private async Task<Result<ConfigureInstanceResult, InstanceActionFailure>> HandleConfigureInstance(ConfigureInstanceMessage message) {
-		return await agent.InstanceManager.Request(new InstanceManagerActor.ConfigureInstanceCommand(message.InstanceGuid, message.Configuration, message.LaunchProperties, message.LaunchNow, AlwaysReportStatus: false));
+		return await HandleConfigureInstance(message, alwaysReportStatus: false);
 	}
 
 	private async Task<Result<LaunchInstanceResult, InstanceActionFailure>> HandleLaunchInstance(LaunchInstanceMessage message) {
@@ -40,4 +94,8 @@ public sealed class ControllerMessageHandlerActor : ReceiveActor<IMessageToAgent
 	private async Task<Result<SendCommandToInstanceResult, InstanceActionFailure>> HandleSendCommandToInstance(SendCommandToInstanceMessage message) {
 		return await agent.InstanceManager.Request(new InstanceManagerActor.SendCommandToInstanceCommand(message.InstanceGuid, message.Command));
 	}
+
+	private void HandleReply(ReplyMessage message) {
+		connection.Receive(message);
+	}
 }

Agent/Phantom.Agent/AgentKey.cs

@@ -1,4 +1,4 @@
-using System.Text;
+using NetMQ;
 using Phantom.Common.Data;
 using Phantom.Utils.Cryptography;
 using Phantom.Utils.IO;
@@ -10,7 +10,7 @@ namespace Phantom.Agent;
 static class AgentKey {
 	private static ILogger Logger { get; } = PhantomLogger.Create(nameof(AgentKey));
 
-	public static Task<ConnectionKey?> Load(string? agentKeyToken, string? agentKeyFilePath) {
+	public static Task<(NetMQCertificate, AuthToken)?> Load(string? agentKeyToken, string? agentKeyFilePath) {
 		if (agentKeyFilePath != null) {
 			return LoadFromFile(agentKeyFilePath);
 		}
@@ -22,19 +22,18 @@ static class AgentKey {
 		}
 	}
 
-	private static async Task<ConnectionKey?> LoadFromFile(string agentKeyFilePath) {
+	private static async Task<(NetMQCertificate, AuthToken)?> LoadFromFile(string agentKeyFilePath) {
 		if (!File.Exists(agentKeyFilePath)) {
 			Logger.Fatal("Missing agent key file: {AgentKeyFilePath}", agentKeyFilePath);
 			return null;
 		}
 
 		try {
-			Files.RequireMaximumFileSize(agentKeyFilePath, maximumBytes: 64);
+			Files.RequireMaximumFileSize(agentKeyFilePath, 64);
-			string[] lines = await File.ReadAllLinesAsync(agentKeyFilePath, Encoding.UTF8);
+			return LoadFromBytes(await File.ReadAllBytesAsync(agentKeyFilePath));
-			return LoadFromToken(lines[0]);
 		} catch (IOException e) {
 			Logger.Fatal("Error loading agent key from file: {AgentKeyFilePath}", agentKeyFilePath);
-			Logger.Fatal("{}", e.Message);
+			Logger.Fatal(e.Message);
 			return null;
 		} catch (Exception) {
 			Logger.Fatal("File does not contain a valid agent key: {AgentKeyFilePath}", agentKeyFilePath);
@@ -42,7 +41,7 @@ static class AgentKey {
 		}
 	}
 
-	private static ConnectionKey? LoadFromToken(string agentKey) {
+	private static (NetMQCertificate, AuthToken)? LoadFromToken(string agentKey) {
 		try {
 			return LoadFromBytes(TokenGenerator.DecodeBytes(agentKey));
 		} catch (Exception) {
@@ -51,9 +50,11 @@ static class AgentKey {
 		}
 	}
 
-	private static ConnectionKey? LoadFromBytes(byte[] agentKey) {
+	private static (NetMQCertificate, AuthToken)? LoadFromBytes(byte[] agentKey) {
-		var connectionKey = ConnectionKey.FromBytes(agentKey);
+		var (publicKey, agentToken) = ConnectionCommonKey.FromBytes(agentKey);
+		var controllerCertificate = NetMQCertificate.FromPublicKey(publicKey);
+		
 		Logger.Information("Loaded agent key.");
-		return connectionKey;
+		return (controllerCertificate, agentToken);
 	}
 }

Agent/Phantom.Agent/Program.cs

@@ -1,5 +1,7 @@
 using System.Reflection;
+using NetMQ;
 using Phantom.Agent;
+using Phantom.Agent.Rpc;
 using Phantom.Agent.Services;
 using Phantom.Agent.Services.Rpc;
 using Phantom.Common.Data.Agent;
@@ -7,9 +9,9 @@ using Phantom.Common.Messages.Agent;
 using Phantom.Common.Messages.Agent.ToController;
 using Phantom.Utils.Actor;
 using Phantom.Utils.Logging;
-using Phantom.Utils.Rpc.Runtime.Client;
+using Phantom.Utils.Rpc;
+using Phantom.Utils.Rpc.Sockets;
 using Phantom.Utils.Runtime;
-using Phantom.Utils.Threading;
 
 const int ProtocolVersion = 1;
 
@@ -46,55 +48,33 @@ try {
 		return 1;
 	}
 
-	var rpcClientConnectionParameters = new RpcClientConnectionParameters(
+	var (controllerCertificate, agentToken) = agentKey.Value;
-		Host: controllerHost,
+	var agentInfo = new AgentInfo(agentGuid.Value, agentName, ProtocolVersion, fullVersion, maxInstances, maxMemory, allowedServerPorts, allowedRconPorts);
-		Port: controllerPort,
-		DistinguishedName: "phantom-controller",
-		CertificateThumbprint: agentKey.Value.CertificateThumbprint,
-		AuthToken: agentKey.Value.AuthToken,
-		SendQueueCapacity: 500,
-		PingInterval: TimeSpan.FromSeconds(10)
-	);
 	
-	using var rpcClient = await RpcClient<IMessageToController, IMessageToAgent>.Connect("Controller", rpcClientConnectionParameters, AgentMessageRegistries.Definitions, shutdownCancellationToken);
-	if (rpcClient == null) {
-		return 1;
-	}
-	
-	var controllerConnection = new ControllerConnection(rpcClient.SendChannel);
-	
-	Task? rpcClientListener = null;
-	try {
 	PhantomLogger.Root.InformationHeading("Launching Phantom Panel agent...");
 	
-		var agentInfo = new AgentInfo(agentGuid.Value, agentName, ProtocolVersion, fullVersion, maxInstances, maxMemory, allowedServerPorts, allowedRconPorts);
+	var rpcConfiguration = new RpcConfiguration("Agent", controllerHost, controllerPort, controllerCertificate);
-		var agentServices = new AgentServices(agentInfo, folders, new AgentServiceConfiguration(maxConcurrentBackupCompressionTasks), controllerConnection);
+	var rpcSocket = RpcClientSocket.Connect(rpcConfiguration, AgentMessageRegistries.Definitions, new RegisterAgentMessage(agentToken, agentInfo));
+
+	var agentServices = new AgentServices(agentInfo, folders, new AgentServiceConfiguration(maxConcurrentBackupCompressionTasks), new ControllerConnection(rpcSocket.Connection));
 	await agentServices.Initialize();
 
-		var rpcMessageHandlerInit = new ControllerMessageHandlerActor.Init(agentServices);
+	var rpcMessageHandlerInit = new ControllerMessageHandlerActor.Init(rpcSocket.Connection, agentServices, shutdownCancellationTokenSource);
 	var rpcMessageHandlerActor = agentServices.ActorSystem.ActorOf(ControllerMessageHandlerActor.Factory(rpcMessageHandlerInit), "ControllerMessageHandler");
 	
-		rpcClientListener = rpcClient.Listen(rpcMessageHandlerActor);
+	var rpcDisconnectSemaphore = new SemaphoreSlim(0, 1);
-		
+	var rpcTask = RpcClientRuntime.Launch(rpcSocket, rpcMessageHandlerActor, rpcDisconnectSemaphore, shutdownCancellationToken);
-		if (await agentServices.Register(controllerConnection, shutdownCancellationToken)) {
-			PhantomLogger.Root.Information("Phantom Panel agent is ready.");
-			await shutdownCancellationToken.WaitHandle.WaitOneAsync();
-		}
-		
-		await agentServices.Shutdown();
-	} finally {
 	try {
-			await controllerConnection.Send(new UnregisterAgentMessage(), CancellationToken.None);
+		await rpcTask.WaitAsync(shutdownCancellationToken);
-			// TODO wait for acknowledgment
-		} catch (Exception e) {
-			PhantomLogger.Root.Warning(e, "Could not unregister agent after shutdown.");
 	} finally {
-			await rpcClient.Shutdown();
+		shutdownCancellationTokenSource.Cancel();
+		await agentServices.Shutdown();
 
-			if (rpcClientListener != null) {
+		rpcDisconnectSemaphore.Release();
-				await rpcClientListener;
+		await rpcTask;
-			}
+		rpcDisconnectSemaphore.Dispose();
-		}
+		
+		NetMQConfig.Cleanup();
 	}
 
 	return 0;

Common/Phantom.Common.Data/AuthToken.cs

@@ -0,0 +1,37 @@
+using System.Diagnostics.CodeAnalysis;
+using System.Security.Cryptography;
+using MemoryPack;
+
+namespace Phantom.Common.Data;
+
+[MemoryPackable(GenerateType.VersionTolerant)]
+[SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
+public sealed partial class AuthToken {
+	internal const int Length = 12;
+
+	[MemoryPackOrder(0)]
+	[MemoryPackInclude]
+	private readonly byte[] bytes;
+
+	internal AuthToken(byte[]? bytes) {
+		ArgumentNullException.ThrowIfNull(bytes);
+
+		if (bytes.Length != Length) {
+			throw new ArgumentOutOfRangeException(nameof(bytes), "Invalid token length: " + bytes.Length + ". Token length must be exactly " + Length + " bytes.");
+		}
+
+		this.bytes = bytes;
+	}
+
+	public bool FixedTimeEquals(AuthToken providedAuthToken) {
+		return CryptographicOperations.FixedTimeEquals(bytes, providedAuthToken.bytes);
+	}
+
+	internal void WriteTo(Span<byte> span) {
+		bytes.CopyTo(span);
+	}
+
+	public static AuthToken Generate() {
+		return new AuthToken(RandomNumberGenerator.GetBytes(Length));
+	}
+}

Common/Phantom.Common.Data/ConnectionCommonKey.cs

@@ -0,0 +1,18 @@
+namespace Phantom.Common.Data;
+
+public readonly record struct ConnectionCommonKey(byte[] CertificatePublicKey, AuthToken AuthToken) {
+	private const byte TokenLength = AuthToken.Length;
+
+	public byte[] ToBytes() {
+		Span<byte> result = stackalloc byte[TokenLength + CertificatePublicKey.Length];
+		AuthToken.WriteTo(result[..TokenLength]);
+		CertificatePublicKey.CopyTo(result[TokenLength..]);
+		return result.ToArray();
+	}
+
+	public static ConnectionCommonKey FromBytes(byte[] agentKey) {
+		var authToken = new AuthToken(agentKey[..TokenLength]);
+		var certificatePublicKey = agentKey[TokenLength..];
+		return new ConnectionCommonKey(certificatePublicKey, authToken);
+	}
+}

Common/Phantom.Common.Data/ConnectionKey.cs

@@ -1,21 +0,0 @@
-using Phantom.Utils.Rpc;
-using Phantom.Utils.Rpc.Runtime.Tls;
-
-namespace Phantom.Common.Data;
-
-public readonly record struct ConnectionKey(RpcCertificateThumbprint CertificateThumbprint, AuthToken AuthToken) {
-	private const byte TokenLength = AuthToken.Length;
-
-	public byte[] ToBytes() {
-		Span<byte> result = stackalloc byte[TokenLength + CertificateThumbprint.Bytes.Length];
-		AuthToken.Bytes.CopyTo(result[..TokenLength]);
-		CertificateThumbprint.Bytes.CopyTo(result[TokenLength..]);
-		return result.ToArray();
-	}
-
-	public static ConnectionKey FromBytes(ReadOnlySpan<byte> data) {
-		var authToken = new AuthToken([..data[..TokenLength]]);
-		var certificateThumbprint = RpcCertificateThumbprint.From(data[TokenLength..]);
-		return new ConnectionKey(certificateThumbprint, authToken);
-	}
-}

Common/Phantom.Common.Data/Minecraft/MinecraftServerKind.cs

@@ -2,5 +2,6 @@
 
 public enum MinecraftServerKind : ushort {
 	Vanilla = 1,
-	Fabric = 2
+	Fabric = 2,
+	Forge = 3
 }

Common/Phantom.Common.Data/Phantom.Common.Data.csproj

@@ -11,7 +11,6 @@
   
   <ItemGroup>
     <ProjectReference Include="..\..\Utils\Phantom.Utils\Phantom.Utils.csproj" />
-    <ProjectReference Include="..\..\Utils\Phantom.Utils.Rpc\Phantom.Utils.Rpc.csproj" />
   </ItemGroup>
 
 </Project>

Common/Phantom.Common.Data/Replies/RegisterAgentFailure.cs

@@ -0,0 +1,6 @@
+namespace Phantom.Common.Data.Replies;
+
+public enum RegisterAgentFailure : byte {
+	ConnectionAlreadyHasAnAgent,
+	InvalidToken
+}

Common/Phantom.Common.Data/Result.cs

@@ -1,6 +1,5 @@
 using System.Diagnostics.CodeAnalysis;
 using MemoryPack;
-using Phantom.Utils.Monads;
 using Phantom.Utils.Result;
 
 namespace Phantom.Common.Data;
@@ -25,9 +24,6 @@ public sealed partial class Result<TValue, TError> {
 	[MemoryPackIgnore]
 	public TError Error => !hasValue ? error! : throw new InvalidOperationException("Attempted to get error from a success result.");
 	
-	[MemoryPackIgnore]
-	public Either<TValue, TError> AsEither => hasValue ? Either.Left(value!) : Either.Right(error!);
-	
 	private Result(bool hasValue, TValue? value, TError? error) {
 		this.hasValue = hasValue;
 		this.value = value;

Common/Phantom.Common.Messages.Agent/AgentMessageRegistries.cs

@@ -1,6 +1,6 @@
-using System.Collections.Immutable;
+using Phantom.Common.Data;
-using Phantom.Common.Data;
 using Phantom.Common.Data.Replies;
+using Phantom.Common.Messages.Agent.BiDirectional;
 using Phantom.Common.Messages.Agent.ToAgent;
 using Phantom.Common.Messages.Agent.ToController;
 using Phantom.Utils.Logging;
@@ -12,15 +12,18 @@ public static class AgentMessageRegistries {
 	public static MessageRegistry<IMessageToAgent> ToAgent { get; } = new (PhantomLogger.Create("MessageRegistry", nameof(ToAgent)));
 	public static MessageRegistry<IMessageToController> ToController { get; } = new (PhantomLogger.Create("MessageRegistry", nameof(ToController)));
 	
-	public static IMessageDefinitions<IMessageToController, IMessageToAgent> Definitions { get; } = new MessageDefinitions();
+	public static IMessageDefinitions<IMessageToAgent, IMessageToController, ReplyMessage> Definitions { get; } = new MessageDefinitions();
 
 	static AgentMessageRegistries() {
+		ToAgent.Add<RegisterAgentSuccessMessage>(0);
+		ToAgent.Add<RegisterAgentFailureMessage>(1);
 		ToAgent.Add<ConfigureInstanceMessage, Result<ConfigureInstanceResult, InstanceActionFailure>>(2);
 		ToAgent.Add<LaunchInstanceMessage, Result<LaunchInstanceResult, InstanceActionFailure>>(3);
 		ToAgent.Add<StopInstanceMessage, Result<StopInstanceResult, InstanceActionFailure>>(4);
 		ToAgent.Add<SendCommandToInstanceMessage, Result<SendCommandToInstanceResult, InstanceActionFailure>>(5);
+		ToAgent.Add<ReplyMessage>(127);
 		
-		ToController.Add<RegisterAgentMessage, ImmutableArray<ConfigureInstanceMessage>>(0);
+		ToController.Add<RegisterAgentMessage>(0);
 		ToController.Add<UnregisterAgentMessage>(1);
 		ToController.Add<AgentIsAliveMessage>(2);
 		ToController.Add<AdvertiseJavaRuntimesMessage>(3);
@@ -29,10 +32,15 @@ public static class AgentMessageRegistries {
 		ToController.Add<ReportAgentStatusMessage>(6);
 		ToController.Add<ReportInstanceEventMessage>(7);
 		ToController.Add<ReportInstancePlayerCountsMessage>(8);
+		ToController.Add<ReplyMessage>(127);
 	}
 
-	private sealed class MessageDefinitions : IMessageDefinitions<IMessageToController, IMessageToAgent> {
+	private sealed class MessageDefinitions : IMessageDefinitions<IMessageToAgent, IMessageToController, ReplyMessage> {
 		public MessageRegistry<IMessageToAgent> ToClient => ToAgent;
 		public MessageRegistry<IMessageToController> ToServer => ToController;
+
+		public ReplyMessage CreateReplyMessage(uint sequenceId, byte[] serializedReply) {
+			return new ReplyMessage(sequenceId, serializedReply);
+		}
 	}
 }

Common/Phantom.Common.Messages.Agent/BiDirectional/ReplyMessage.cs

@@ -0,0 +1,10 @@
+using MemoryPack;
+using Phantom.Utils.Rpc.Message;
+
+namespace Phantom.Common.Messages.Agent.BiDirectional;
+
+[MemoryPackable(GenerateType.VersionTolerant)]
+public sealed partial record ReplyMessage(
+	[property: MemoryPackOrder(0)] uint SequenceId,
+	[property: MemoryPackOrder(1)] byte[] SerializedReply
+) : IMessageToController, IMessageToAgent, IReply;

Common/Phantom.Common.Messages.Agent/Handshake/IAgentHandshakeResult.cs

@@ -1,10 +0,0 @@
-using MemoryPack;
-
-namespace Phantom.Common.Messages.Agent.Handshake;
-
-[MemoryPackable]
-[MemoryPackUnion(tag: 0, typeof(InvalidAuthToken))]
-public partial interface IAgentHandshakeResult;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record InvalidAuthToken : IAgentHandshakeResult;

Common/Phantom.Common.Messages.Agent/ToAgent/RegisterAgentFailureMessage.cs

@@ -0,0 +1,9 @@
+using MemoryPack;
+using Phantom.Common.Data.Replies;
+
+namespace Phantom.Common.Messages.Agent.ToAgent;
+
+[MemoryPackable(GenerateType.VersionTolerant)]
+public sealed partial record RegisterAgentFailureMessage(
+	[property: MemoryPackOrder(0)] RegisterAgentFailure FailureKind
+) : IMessageToAgent;

Common/Phantom.Common.Messages.Agent/ToAgent/RegisterAgentSuccessMessage.cs

@@ -0,0 +1,9 @@
+using System.Collections.Immutable;
+using MemoryPack;
+
+namespace Phantom.Common.Messages.Agent.ToAgent;
+
+[MemoryPackable(GenerateType.VersionTolerant)]
+public sealed partial record RegisterAgentSuccessMessage(
+	[property: MemoryPackOrder(0)] ImmutableArray<ConfigureInstanceMessage> InitialInstanceConfigurations
+) : IMessageToAgent;

Common/Phantom.Common.Messages.Agent/ToController/RegisterAgentMessage.cs

@@ -1,12 +1,11 @@
-using System.Collections.Immutable;
+using MemoryPack;
-using MemoryPack;
+using Phantom.Common.Data;
 using Phantom.Common.Data.Agent;
-using Phantom.Common.Messages.Agent.ToAgent;
-using Phantom.Utils.Actor;
 
 namespace Phantom.Common.Messages.Agent.ToController;
 
 [MemoryPackable(GenerateType.VersionTolerant)]
 public sealed partial record RegisterAgentMessage(
-	[property: MemoryPackOrder(0)] AgentInfo AgentInfo
+	[property: MemoryPackOrder(0)] AuthToken AuthToken,
-) : IMessageToController, ICanReply<ImmutableArray<ConfigureInstanceMessage>>;
+	[property: MemoryPackOrder(1)] AgentInfo AgentInfo
+) : IMessageToController;

Common/Phantom.Common.Messages.Web/BiDirectional/ReplyMessage.cs

@@ -0,0 +1,10 @@
+using MemoryPack;
+using Phantom.Utils.Rpc.Message;
+
+namespace Phantom.Common.Messages.Web.BiDirectional;
+
+[MemoryPackable(GenerateType.VersionTolerant)]
+public sealed partial record ReplyMessage(
+	[property: MemoryPackOrder(0)] uint SequenceId,
+	[property: MemoryPackOrder(1)] byte[] SerializedReply
+) : IMessageToController, IMessageToWeb, IReply;

Common/Phantom.Common.Messages.Web/ToController/RegisterWebMessage.cs

@@ -0,0 +1,9 @@
+using MemoryPack;
+using Phantom.Common.Data;
+
+namespace Phantom.Common.Messages.Web.ToController;
+
+[MemoryPackable(GenerateType.VersionTolerant)]
+public sealed partial record RegisterWebMessage(
+	[property: MemoryPackOrder(0)] AuthToken AuthToken
+) : IMessageToController;

Common/Phantom.Common.Messages.Web/WebMessageRegistries.cs

@@ -7,6 +7,7 @@ using Phantom.Common.Data.Web.AuditLog;
 using Phantom.Common.Data.Web.EventLog;
 using Phantom.Common.Data.Web.Instance;
 using Phantom.Common.Data.Web.Users;
+using Phantom.Common.Messages.Web.BiDirectional;
 using Phantom.Common.Messages.Web.ToController;
 using Phantom.Common.Messages.Web.ToWeb;
 using Phantom.Utils.Logging;
@@ -18,9 +19,10 @@ public static class WebMessageRegistries {
 	public static MessageRegistry<IMessageToController> ToController { get; } = new (PhantomLogger.Create("MessageRegistry", nameof(ToController)));
 	public static MessageRegistry<IMessageToWeb> ToWeb { get; } = new (PhantomLogger.Create("MessageRegistry", nameof(ToWeb)));
 	
-	public static IMessageDefinitions<IMessageToController, IMessageToWeb> Definitions { get; } = new MessageDefinitions();
+	public static IMessageDefinitions<IMessageToWeb, IMessageToController, ReplyMessage> Definitions { get; } = new MessageDefinitions();
 
 	static WebMessageRegistries() {
+		ToController.Add<RegisterWebMessage>(0);
 		ToController.Add<UnregisterWebMessage>(1);
 		ToController.Add<LogInMessage, Optional<LogInSuccess>>(2);
 		ToController.Add<LogOutMessage>(3);
@@ -40,15 +42,22 @@ public static class WebMessageRegistries {
 		ToController.Add<GetAgentJavaRuntimesMessage, ImmutableDictionary<Guid, ImmutableArray<TaggedJavaRuntime>>>(17);
 		ToController.Add<GetAuditLogMessage, Result<ImmutableArray<AuditLogItem>, UserActionFailure>>(18);
 		ToController.Add<GetEventLogMessage, Result<ImmutableArray<EventLogItem>, UserActionFailure>>(19);
+		ToController.Add<ReplyMessage>(127);
 		
+		ToWeb.Add<RegisterWebResultMessage>(0);
 		ToWeb.Add<RefreshAgentsMessage>(1);
 		ToWeb.Add<RefreshInstancesMessage>(2);
 		ToWeb.Add<InstanceOutputMessage>(3);
 		ToWeb.Add<RefreshUserSessionMessage>(4);
+		ToWeb.Add<ReplyMessage>(127);
 	}
 
-	private sealed class MessageDefinitions : IMessageDefinitions<IMessageToController, IMessageToWeb> {
+	private sealed class MessageDefinitions : IMessageDefinitions<IMessageToWeb, IMessageToController, ReplyMessage> {
 		public MessageRegistry<IMessageToWeb> ToClient => ToWeb;
 		public MessageRegistry<IMessageToController> ToServer => ToController;
+
+		public ReplyMessage CreateReplyMessage(uint sequenceId, byte[] serializedReply) {
+			return new ReplyMessage(sequenceId, serializedReply);
+		}
 	}
 }

Controller/Phantom.Controller.Services/Agents/AgentActor.cs

@@ -21,6 +21,7 @@ using Phantom.Utils.Actor.Mailbox;
 using Phantom.Utils.Actor.Tasks;
 using Phantom.Utils.Collections;
 using Phantom.Utils.Logging;
+using Phantom.Utils.Rpc.Runtime;
 using Serilog;
 
 namespace Phantom.Controller.Services.Agents;

Controller/Phantom.Controller.Services/Agents/AgentConnection.cs

@@ -1,6 +1,7 @@
 using Phantom.Common.Messages.Agent;
 using Phantom.Utils.Actor;
 using Phantom.Utils.Logging;
+using Phantom.Utils.Rpc.Runtime;
 using Serilog;
 
 namespace Phantom.Controller.Services.Agents;

Controller/Phantom.Controller.Services/Agents/AgentManager.cs

@@ -13,7 +13,7 @@ using Phantom.Controller.Minecraft;
 using Phantom.Controller.Services.Users.Sessions;
 using Phantom.Utils.Actor;
 using Phantom.Utils.Logging;
-using Phantom.Utils.Rpc;
+using Phantom.Utils.Rpc.Runtime;
 using Serilog;
 
 namespace Phantom.Controller.Services.Agents;
@@ -65,7 +65,7 @@ sealed class AgentManager {
 
 	public async Task<bool> RegisterAgent(AuthToken authToken, AgentInfo agentInfo, RpcConnectionToClient<IMessageToAgent> connection) {
 		if (!this.authToken.FixedTimeEquals(authToken)) {
-			await connection.Send(new RegisterAgentFailureMessage(RegisterAgentError.InvalidToken));
+			await connection.Send(new RegisterAgentFailureMessage(RegisterAgentFailure.InvalidToken));
 			return false;
 		}
 		

Controller/Phantom.Controller.Services/ControllerServices.cs

@@ -1,4 +1,5 @@
 using Akka.Actor;
+using Phantom.Common.Data;
 using Phantom.Common.Messages.Agent;
 using Phantom.Common.Messages.Agent.ToController;
 using Phantom.Common.Messages.Web;
@@ -12,7 +13,7 @@ using Phantom.Controller.Services.Rpc;
 using Phantom.Controller.Services.Users;
 using Phantom.Controller.Services.Users.Sessions;
 using Phantom.Utils.Actor;
-using Phantom.Utils.Rpc;
+using Phantom.Utils.Rpc.Runtime;
 using IMessageFromAgentToController = Phantom.Common.Messages.Agent.IMessageToController;
 using IMessageFromWebToController = Phantom.Common.Messages.Web.IMessageToController;
 

Controller/Phantom.Controller.Services/Rpc/AgentMessageHandlerActor.cs

@@ -1,11 +1,13 @@
 using Phantom.Common.Data.Replies;
 using Phantom.Common.Messages.Agent;
+using Phantom.Common.Messages.Agent.BiDirectional;
 using Phantom.Common.Messages.Agent.ToAgent;
 using Phantom.Common.Messages.Agent.ToController;
 using Phantom.Controller.Services.Agents;
 using Phantom.Controller.Services.Events;
 using Phantom.Controller.Services.Instances;
 using Phantom.Utils.Actor;
+using Phantom.Utils.Rpc.Runtime;
 
 namespace Phantom.Controller.Services.Rpc;
 
@@ -40,11 +42,12 @@ sealed class AgentMessageHandlerActor : ReceiveActor<IMessageToController> {
 		Receive<ReportInstancePlayerCountsMessage>(HandleReportInstancePlayerCounts);
 		Receive<ReportInstanceEventMessage>(HandleReportInstanceEvent);
 		Receive<InstanceOutputMessage>(HandleInstanceOutput);
+		Receive<ReplyMessage>(HandleReply);
 	}
 
 	private async Task HandleRegisterAgent(RegisterAgentMessage message) {
 		if (agentGuid != message.AgentInfo.AgentGuid) {
-			await connection.Send(new RegisterAgentFailureMessage(RegisterAgentError.ConnectionAlreadyHasAnAgent));
+			await connection.Send(new RegisterAgentFailureMessage(RegisterAgentFailure.ConnectionAlreadyHasAnAgent));
 		}
 		else {
 			await agentRegistrationHandler.TryRegisterImpl(connection, message);
@@ -83,4 +86,8 @@ sealed class AgentMessageHandlerActor : ReceiveActor<IMessageToController> {
 	private void HandleInstanceOutput(InstanceOutputMessage message) {
 		instanceLogManager.ReceiveLines(message.InstanceGuid, message.Lines);
 	}
+
+	private void HandleReply(ReplyMessage message) {
+		connection.Receive(message);
+	}
 }

Controller/Phantom.Controller.Services/Rpc/AgentRegistrationHandler.cs

@@ -4,7 +4,7 @@ using Phantom.Controller.Services.Agents;
 using Phantom.Controller.Services.Events;
 using Phantom.Controller.Services.Instances;
 using Phantom.Utils.Actor;
-using Phantom.Utils.Rpc.Runtime2;
+using Phantom.Utils.Rpc.Runtime;
 
 namespace Phantom.Controller.Services.Rpc;
 

Controller/Phantom.Controller.Services/Rpc/WebMessageDataUpdateSenderActor.cs

@@ -5,6 +5,7 @@ using Phantom.Common.Messages.Web;
 using Phantom.Common.Messages.Web.ToWeb;
 using Phantom.Controller.Services.Instances;
 using Phantom.Utils.Actor;
+using Phantom.Utils.Rpc.Runtime;
 
 namespace Phantom.Controller.Services.Rpc;
 

Controller/Phantom.Controller.Services/Rpc/WebMessageHandlerActor.cs

@@ -7,6 +7,7 @@ using Phantom.Common.Data.Web.AuditLog;
 using Phantom.Common.Data.Web.EventLog;
 using Phantom.Common.Data.Web.Instance;
 using Phantom.Common.Data.Web.Users;
+using Phantom.Common.Messages.Agent.BiDirectional;
 using Phantom.Common.Messages.Web;
 using Phantom.Common.Messages.Web.ToController;
 using Phantom.Controller.Minecraft;
@@ -16,6 +17,7 @@ using Phantom.Controller.Services.Instances;
 using Phantom.Controller.Services.Users;
 using Phantom.Controller.Services.Users.Sessions;
 using Phantom.Utils.Actor;
+using Phantom.Utils.Rpc.Runtime;
 
 namespace Phantom.Controller.Services.Rpc;
 
@@ -87,6 +89,7 @@ sealed class WebMessageHandlerActor : ReceiveActor<IMessageToController> {
 		ReceiveAndReply<GetAgentJavaRuntimesMessage, ImmutableDictionary<Guid, ImmutableArray<TaggedJavaRuntime>>>(HandleGetAgentJavaRuntimes);
 		ReceiveAndReplyLater<GetAuditLogMessage, Result<ImmutableArray<AuditLogItem>, UserActionFailure>>(HandleGetAuditLog);
 		ReceiveAndReplyLater<GetEventLogMessage, Result<ImmutableArray<EventLogItem>, UserActionFailure>>(HandleGetEventLog);
+		Receive<ReplyMessage>(HandleReply);
 	}
 
 	private async Task HandleRegisterWeb(RegisterWebMessage message) {
@@ -188,4 +191,8 @@ sealed class WebMessageHandlerActor : ReceiveActor<IMessageToController> {
 	private Task<Result<ImmutableArray<EventLogItem>, UserActionFailure>> HandleGetEventLog(GetEventLogMessage message) {
 		return eventLogManager.GetMostRecentItems(userLoginManager.GetLoggedInUser(message.AuthToken), message.Count);
 	}
+
+	private void HandleReply(ReplyMessage message) {
+		connection.Receive(message);
+	}
 }

Controller/Phantom.Controller.Services/Rpc/WebRegistrationHandler.cs

@@ -1,4 +1,5 @@
-using Phantom.Common.Messages.Web;
+using Phantom.Common.Data;
+using Phantom.Common.Messages.Web;
 using Phantom.Common.Messages.Web.ToController;
 using Phantom.Common.Messages.Web.ToWeb;
 using Phantom.Controller.Minecraft;
@@ -9,7 +10,7 @@ using Phantom.Controller.Services.Users;
 using Phantom.Controller.Services.Users.Sessions;
 using Phantom.Utils.Actor;
 using Phantom.Utils.Logging;
-using Phantom.Utils.Rpc;
+using Phantom.Utils.Rpc.Runtime;
 using Serilog;
 
 namespace Phantom.Controller.Services.Rpc;

Controller/Phantom.Controller.Services/Users/UserManager.cs

@@ -1,7 +1,6 @@
 using System.Collections.Immutable;
 using Phantom.Common.Data;
 using Phantom.Common.Data.Web.Users;
-using Phantom.Common.Data.Web.Users.CreateOrUpdateAdministratorUserResults;
 using Phantom.Controller.Database;
 using Phantom.Controller.Database.Entities;
 using Phantom.Controller.Database.Repositories;
@@ -57,12 +56,12 @@ sealed class UserManager {
 					wasCreated = true;
 				}
 				else {
-					return new CreationFailed(result.Error);
+					return new Common.Data.Web.Users.CreateOrUpdateAdministratorUserResults.CreationFailed(result.Error);
 				}
 			}
 			else {
 				if (userRepository.SetUserPassword(user, password).TryGetError(out var error)) {
-					return new UpdatingFailed(error);
+					return new Common.Data.Web.Users.CreateOrUpdateAdministratorUserResults.UpdatingFailed(error);
 				}
 
 				auditLogWriter.AdministratorUserModified(user);
@@ -71,7 +70,7 @@ sealed class UserManager {
 
 			var role = await new RoleRepository(db).GetByGuid(Role.Administrator.Guid);
 			if (role == null) {
-				return new AddingToRoleFailed();
+				return new Common.Data.Web.Users.CreateOrUpdateAdministratorUserResults.AddingToRoleFailed();
 			}
 
 			await new UserRoleRepository(db).Add(user, role);
@@ -85,10 +84,10 @@ sealed class UserManager {
 				Logger.Information("Updated administrator user \"{Username}\" (GUID {Guid}).", username, user.UserGuid);
 			}
 
-			return new Success(user.ToUserInfo());
+			return new Common.Data.Web.Users.CreateOrUpdateAdministratorUserResults.Success(user.ToUserInfo());
 		} catch (Exception e) {
 			Logger.Error(e, "Could not create or update administrator user \"{Username}\".", username);
-			return new UnknownError();
+			return new Common.Data.Web.Users.CreateOrUpdateAdministratorUserResults.UnknownError();
 		}
 	}
 

Controller/Phantom.Controller/ConnectionKeyData.cs

@@ -1,6 +1,6 @@
-using Phantom.Utils.Rpc;
+using NetMQ;
-using Phantom.Utils.Rpc.Runtime.Tls;
+using Phantom.Common.Data;
 
 namespace Phantom.Controller;
 
-readonly record struct ConnectionKeyData(RpcServerCertificate Certificate, AuthToken AuthToken);
+readonly record struct ConnectionKeyData(NetMQCertificate Certificate, AuthToken AuthToken);

Controller/Phantom.Controller/ConnectionKeyFiles.cs

@@ -1,37 +1,39 @@
-using Phantom.Common.Data;
+using NetMQ;
+using Phantom.Common.Data;
 using Phantom.Utils.Cryptography;
 using Phantom.Utils.IO;
 using Phantom.Utils.Logging;
-using Phantom.Utils.Monads;
-using Phantom.Utils.Rpc;
-using Phantom.Utils.Rpc.Runtime.Tls;
 using Serilog;
 
 namespace Phantom.Controller;
 
 abstract class ConnectionKeyFiles {
+	private const string CommonKeyFileExtension = ".key";
+	private const string SecretKeyFileExtension = ".secret";
+
 	private readonly ILogger logger;
-	private readonly string certificateFileName;
+	private readonly string commonKeyFileName;
-	private readonly string authTokenFileName;
+	private readonly string secretKeyFileName;
 
 	private ConnectionKeyFiles(ILogger logger, string name) {
 		this.logger = logger;
-		this.certificateFileName = name + ".pfx";
+		this.commonKeyFileName = name + CommonKeyFileExtension;
-		this.authTokenFileName = name + ".auth";
+		this.secretKeyFileName = name + SecretKeyFileExtension;
 	}
 
 	public async Task<ConnectionKeyData?> CreateOrLoad(string folderPath) {
-		string certificateFilePath = Path.Combine(folderPath, certificateFileName);
+		string commonKeyFilePath = Path.Combine(folderPath, commonKeyFileName);
-		string authTokenFilePath = Path.Combine(folderPath, authTokenFileName);
+		string secretKeyFilePath = Path.Combine(folderPath, secretKeyFileName);
 
-		bool certificateFileExists = File.Exists(certificateFilePath);
+		bool commonKeyFileExists = File.Exists(commonKeyFilePath);
-		bool authTokenFileExists = File.Exists(authTokenFilePath);
+		bool secretKeyFileExists = File.Exists(secretKeyFilePath);
 
-		if (certificateFileExists && authTokenFileExists) {
+		if (commonKeyFileExists && secretKeyFileExists) {
 			try {
-				return await ReadKeyFiles(certificateFilePath, authTokenFilePath);
+				return await ReadKeyFiles(commonKeyFilePath, secretKeyFilePath);
 			} catch (IOException e) {
-				logger.Fatal(e, "Error reading connection key files.");
+				logger.Fatal("Error reading connection key files.");
+				logger.Fatal(e.Message);
 				return null;
 			} catch (Exception) {
 				logger.Fatal("Connection key files contain invalid data.");
@@ -39,75 +41,72 @@ abstract class ConnectionKeyFiles {
 			}
 		}
 
-		if (certificateFileExists || authTokenFileExists) {
+		if (commonKeyFileExists || secretKeyFileExists) {
-			string existingKeyFilePath = certificateFileExists ? certificateFilePath : authTokenFilePath;
+			string existingKeyFilePath = commonKeyFileExists ? commonKeyFilePath : secretKeyFilePath;
-			string missingKeyFileName = certificateFileExists ? authTokenFileName : certificateFileName;
+			string missingKeyFileName = commonKeyFileExists ? secretKeyFileName : commonKeyFileName;
-			logger.Fatal("Connection key file {ExistingKeyFilePath} exists but {MissingKeyFileName} does not. Please delete it to regenerate both files.", existingKeyFilePath, missingKeyFileName);
+			logger.Fatal("The connection key file {ExistingKeyFilePath} exists but {MissingKeyFileName} does not. Please delete it to regenerate both files.", existingKeyFilePath, missingKeyFileName);
 			return null;
 		}
 
 		logger.Information("Creating connection key files in: {FolderPath}", folderPath);
 
 		try {
-			return await GenerateKeyFiles(certificateFilePath, authTokenFilePath);
+			return await GenerateKeyFiles(commonKeyFilePath, secretKeyFilePath);
 		} catch (Exception e) {
-			logger.Fatal(e, "Error creating connection key files.");
+			logger.Fatal("Error creating connection key files.");
+			logger.Fatal(e.Message);
 			return null;
 		}
 	}
 
-	private async Task<ConnectionKeyData?> ReadKeyFiles(string certificateFilePath, string authTokenFilePath) {
+	private async Task<ConnectionKeyData?> ReadKeyFiles(string commonKeyFilePath, string secretKeyFilePath) {
-		RpcServerCertificate certificate = null!;
+		byte[] commonKeyBytes = await ReadKeyFile(commonKeyFilePath);
+		byte[] secretKeyBytes = await ReadKeyFile(secretKeyFilePath);
 
-		switch (RpcServerCertificate.Load(certificateFilePath)) {
+		var (publicKey, authToken) = ConnectionCommonKey.FromBytes(commonKeyBytes);
-			case Left<RpcServerCertificate, DisallowedAlgorithmError>(var rpcServerCertificate):
+		var certificate = new NetMQCertificate(secretKeyBytes, publicKey);
-				certificate = rpcServerCertificate;
-				break;
 
-			case Right<RpcServerCertificate, DisallowedAlgorithmError>(var error):
-				logger.Fatal("Certificate {CertificateFilePath} was expected to use {ExpectedAlgorithmName}, instead it uses {ActualAlgorithmName}.", certificateFilePath, error.ExpectedAlgorithmName, error.ActualAlgorithmName);
-				return null;
-		}
-		
-		var authToken = new AuthToken([..await ReadKeyFile(authTokenFilePath)]);
 		logger.Information("Loaded connection key files.");
-		
+		LogCommonKey(commonKeyFilePath, TokenGenerator.EncodeBytes(commonKeyBytes));
-		var connectionKey = new ConnectionKey(certificate.Thumbprint, authToken);
-		LogCommonKey(TokenGenerator.EncodeBytes(connectionKey.ToBytes()));
 		
 		return new ConnectionKeyData(certificate, authToken);
 	}
 
 	private static Task<byte[]> ReadKeyFile(string filePath) {
-		Files.RequireMaximumFileSize(filePath, maximumBytes: 64);
+		Files.RequireMaximumFileSize(filePath, 64);
 		return File.ReadAllBytesAsync(filePath);
 	}
 
-	private async Task<ConnectionKeyData> GenerateKeyFiles(string certificateFilePath, string authTokenFilePath) {
+	private async Task<ConnectionKeyData> GenerateKeyFiles(string commonKeyFilePath, string secretKeyFilePath) {
-		var certificateBytes = RpcServerCertificate.CreateAndExport("phantom-controller");
+		var certificate = new NetMQCertificate();
 		var authToken = AuthToken.Generate();
+		var commonKey = new ConnectionCommonKey(certificate.PublicKey, authToken).ToBytes();
+
+		await Files.WriteBytesAsync(secretKeyFilePath, certificate.SecretKey, FileMode.Create, Chmod.URW_GR);
+		await Files.WriteBytesAsync(commonKeyFilePath, commonKey, FileMode.Create, Chmod.URW_GR);
 
-		await Files.WriteBytesAsync(certificateFilePath, certificateBytes, FileMode.Create, Chmod.URW_GR);
-		await Files.WriteBytesAsync(authTokenFilePath, authToken.Bytes.ToArray(), FileMode.Create, Chmod.URW_GR);
 		logger.Information("Created new connection key files.");
-		
+		LogCommonKey(commonKeyFilePath, TokenGenerator.EncodeBytes(commonKey));
-		var certificate = RpcServerCertificate.Load(certificateFilePath).RequireLeft;
-		var connectionKey = new ConnectionKey(certificate.Thumbprint, authToken);
-		LogCommonKey(TokenGenerator.EncodeBytes(connectionKey.ToBytes()));
 		
 		return new ConnectionKeyData(certificate, authToken);
 	}
 
-	protected abstract void LogCommonKey(string commonKeyEncoded);
+	protected abstract void LogCommonKey(string commonKeyFilePath, string commonKeyEncoded);
 
-	internal sealed class Agent() : ConnectionKeyFiles(PhantomLogger.Create<ConnectionKeyFiles, Agent>(), "agent") {
+	internal sealed class Agent : ConnectionKeyFiles {
-		protected override void LogCommonKey(string commonKeyEncoded) {
+		public Agent() : base(PhantomLogger.Create<ConnectionKeyFiles, Agent>(), "agent") {}
+
+		protected override void LogCommonKey(string commonKeyFilePath, string commonKeyEncoded) {
+			logger.Information("Agent key file: {AgentKeyFilePath}", commonKeyFilePath);
 			logger.Information("Agent key: {AgentKey}", commonKeyEncoded);
 		}
 	}
 
-	internal sealed class Web() : ConnectionKeyFiles(PhantomLogger.Create<ConnectionKeyFiles, Web>(), "web") {
+	internal sealed class Web : ConnectionKeyFiles {
-		protected override void LogCommonKey(string commonKeyEncoded) {
+		public Web() : base(PhantomLogger.Create<ConnectionKeyFiles, Web>(), "web") {}
+		
+		protected override void LogCommonKey(string commonKeyFilePath, string commonKeyEncoded) {
+			logger.Information("Web key file: {WebKeyFilePath}", commonKeyFilePath);
 			logger.Information("Web key: {WebKey}", commonKeyEncoded);
 		}
 	}

Controller/Phantom.Controller/Program.cs

@@ -1,12 +1,15 @@
 using System.Reflection;
+using NetMQ;
+using Phantom.Common.Messages.Agent;
+using Phantom.Common.Messages.Web;
 using Phantom.Controller;
 using Phantom.Controller.Database.Postgres;
 using Phantom.Controller.Services;
 using Phantom.Utils.IO;
 using Phantom.Utils.Logging;
-using Phantom.Utils.Rpc.Runtime.Server;
+using Phantom.Utils.Rpc;
+using Phantom.Utils.Rpc.Runtime;
 using Phantom.Utils.Runtime;
-using Phantom.Utils.Tasks;
 
 var shutdownCancellationTokenSource = new CancellationTokenSource();
 var shutdownCancellationToken = shutdownCancellationTokenSource.Token;
@@ -34,7 +37,7 @@ try {
 	PhantomLogger.Root.InformationHeading("Initializing Phantom Panel controller...");
 	PhantomLogger.Root.Information("Controller version: {Version}", fullVersion);
 	
-	var (agentRpcServerHost, webRpcServerHost, sqlConnectionString) = Variables.LoadOrStop();
+	var (agentRpcServerHost, agentRpcServerPort, webRpcServerHost, webRpcServerPort, sqlConnectionString) = Variables.LoadOrStop();
 
 	string secretsPath = Path.GetFullPath("./secrets");
 	CreateFolderOrStop(secretsPath, Chmod.URWX_GRX);
@@ -56,26 +59,20 @@ try {
 	using var controllerServices = new ControllerServices(dbContextFactory, agentKeyData.AuthToken, webKeyData.AuthToken, shutdownCancellationToken);
 	await controllerServices.Initialize();
 
-	LinkedTasks<bool> rpcServerTasks = new LinkedTasks<bool>([
+	static RpcConfiguration ConfigureRpc(string serviceName, string host, ushort port, ConnectionKeyData connectionKey) {
-		new RpcServer("Agent", agentRpcServerHost, agentKeyData.AuthToken, agentKeyData.Certificate).Run(shutdownCancellationToken),
+		return new RpcConfiguration(serviceName, host, port, connectionKey.Certificate);
-		new RpcServer("Web", webRpcServerHost, agentKeyData.AuthToken, webKeyData.Certificate).Run(shutdownCancellationToken),
-	]);
-	
-	// If either RPC server crashes, stop the whole process.
-	await rpcServerTasks.CancelTokenWhenAnyCompletes(shutdownCancellationTokenSource);
-	
-	foreach (Task<bool> rpcServerTask in await rpcServerTasks.WaitForAll()) {
-		if (rpcServerTask.IsFaulted || rpcServerTask is { IsCompletedSuccessfully: true, Result: false }) {
-			return 1;
 	}
+
+	try {
+		await Task.WhenAll(
+			RpcServerRuntime.Launch(ConfigureRpc("Agent", agentRpcServerHost, agentRpcServerPort, agentKeyData), AgentMessageRegistries.Definitions, controllerServices.AgentRegistrationHandler, controllerServices.ActorSystem, shutdownCancellationToken),
+			RpcServerRuntime.Launch(ConfigureRpc("Web", webRpcServerHost, webRpcServerPort, webKeyData), WebMessageRegistries.Definitions, controllerServices.WebRegistrationHandler, controllerServices.ActorSystem, shutdownCancellationToken)
+		);
+	} finally {
+		NetMQConfig.Cleanup();
 	}
 
 	return 0;
-	
-	// await Task.WhenAll(
-	// 	RpcServerRuntime.Launch(ConfigureRpc("Agent", agentRpcServerHost, agentRpcServerPort, agentKeyData), AgentMessageRegistries.Definitions, controllerServices.AgentRegistrationHandler, controllerServices.ActorSystem, shutdownCancellationToken),
-	// 	RpcServerRuntime.Launch(ConfigureRpc("Web", webRpcServerHost, webRpcServerPort, webKeyData), WebMessageRegistries.Definitions, controllerServices.WebRegistrationHandler, controllerServices.ActorSystem, shutdownCancellationToken)
-	// );
 } catch (OperationCanceledException) {
 	return 0;
 } catch (StopProcedureException) {

Controller/Phantom.Controller/Variables.cs

@@ -1,13 +1,14 @@
-using System.Net;
+using Npgsql;
-using Npgsql;
 using Phantom.Utils.Logging;
 using Phantom.Utils.Runtime;
 
 namespace Phantom.Controller;
 
 sealed record Variables(
-	EndPoint AgentRpcServerHost,
+	string AgentRpcServerHost,
-	EndPoint WebRpcServerHost,
+	ushort AgentRpcServerPort,
+	string WebRpcServerHost,
+	ushort WebRpcServerPort,
 	string SqlConnectionString
 ) {
 	private static Variables LoadOrThrow() {
@@ -19,19 +20,11 @@ sealed record Variables(
 			Database = EnvironmentVariables.GetString("PG_DATABASE").Require
 		};
 
-		EndPoint agentRpcServerHost = new IPEndPoint(
-			EnvironmentVariables.GetIpAddress("AGENT_RPC_SERVER_HOST").WithDefault(IPAddress.Any),
-			EnvironmentVariables.GetPortNumber("AGENT_RPC_SERVER_PORT").WithDefault(9401)
-		);
-		
-		EndPoint webRpcServerHost = new IPEndPoint(
-			EnvironmentVariables.GetIpAddress("WEB_RPC_SERVER_HOST").WithDefault(IPAddress.Any),
-			EnvironmentVariables.GetPortNumber("WEB_RPC_SERVER_PORT").WithDefault(9401)
-		);
-		
 		return new Variables(
-			agentRpcServerHost,
+			EnvironmentVariables.GetString("AGENT_RPC_SERVER_HOST").WithDefault("0.0.0.0"),
-			webRpcServerHost,
+			EnvironmentVariables.GetPortNumber("AGENT_RPC_SERVER_PORT").WithDefault(9401),
+			EnvironmentVariables.GetString("WEB_RPC_SERVER_HOST").WithDefault("0.0.0.0"),
+			EnvironmentVariables.GetPortNumber("WEB_RPC_SERVER_PORT").WithDefault(9402),
 			connectionStringBuilder.ToString()
 		);
 	}

Directory.Build.props

@@ -1,8 +1,8 @@
 <Project>
   
   <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
-    <LangVersion>13</LangVersion>
+    <LangVersion>11</LangVersion>
   </PropertyGroup>
   
   <PropertyGroup>

Dockerfile

@@ -1,7 +1,7 @@
 # +---------------+
 # | Prepare build |
 # +---------------+
-FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/nightly/sdk:9.0 AS phantom-builder
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/nightly/sdk:8.0 AS phantom-builder
 ARG TARGETARCH
 
 ADD . /app
@@ -19,7 +19,7 @@ RUN find .artifacts/publish/*/* -maxdepth 0 -execdir mv '{}' 'release' \;
 # +---------------------+
 # | Phantom Agent image |
 # +---------------------+
-FROM mcr.microsoft.com/dotnet/nightly/runtime:9.0 AS phantom-agent
+FROM mcr.microsoft.com/dotnet/nightly/runtime:8.0 AS phantom-agent
 
 RUN mkdir /data && chmod 777 /data
 WORKDIR /data
@@ -46,7 +46,7 @@ ENTRYPOINT ["dotnet", "/app/Phantom.Agent.dll"]
 # +--------------------------+
 # | Phantom Controller image |
 # +--------------------------+
-FROM mcr.microsoft.com/dotnet/nightly/runtime:9.0 AS phantom-controller
+FROM mcr.microsoft.com/dotnet/nightly/runtime:8.0 AS phantom-controller
 
 RUN mkdir /data && chmod 777 /data
 WORKDIR /data
@@ -59,7 +59,7 @@ ENTRYPOINT ["dotnet", "/app/Phantom.Controller.dll"]
 # +-------------------+
 # | Phantom Web image |
 # +-------------------+
-FROM mcr.microsoft.com/dotnet/nightly/aspnet:9.0 AS phantom-web
+FROM mcr.microsoft.com/dotnet/nightly/aspnet:8.0 AS phantom-web
 
 RUN mkdir /data && chmod 777 /data
 WORKDIR /data

PhantomPanel.sln

@@ -18,6 +18,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Phantom.Agent", "Agent\Phan
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Phantom.Agent.Minecraft", "Agent\Phantom.Agent.Minecraft\Phantom.Agent.Minecraft.csproj", "{9FE000D0-91AC-4CB4-8956-91CCC0270015}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Phantom.Agent.Rpc", "Agent\Phantom.Agent.Rpc\Phantom.Agent.Rpc.csproj", "{665C7B87-0165-48BC-B6A6-17A3812A70C9}"
+EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Phantom.Agent.Services", "Agent\Phantom.Agent.Services\Phantom.Agent.Services.csproj", "{AEE8B77E-AB07-423F-9981-8CD829ACB834}"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Phantom.Common.Data", "Common\Phantom.Common.Data\Phantom.Common.Data.csproj", "{6C3DB1E5-F695-4D70-8F3A-78C2957274BE}"
@@ -74,6 +76,10 @@ Global
 		{9FE000D0-91AC-4CB4-8956-91CCC0270015}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{9FE000D0-91AC-4CB4-8956-91CCC0270015}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{9FE000D0-91AC-4CB4-8956-91CCC0270015}.Release|Any CPU.Build.0 = Release|Any CPU
+		{665C7B87-0165-48BC-B6A6-17A3812A70C9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{665C7B87-0165-48BC-B6A6-17A3812A70C9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{665C7B87-0165-48BC-B6A6-17A3812A70C9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{665C7B87-0165-48BC-B6A6-17A3812A70C9}.Release|Any CPU.Build.0 = Release|Any CPU
 		{AEE8B77E-AB07-423F-9981-8CD829ACB834}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{AEE8B77E-AB07-423F-9981-8CD829ACB834}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{AEE8B77E-AB07-423F-9981-8CD829ACB834}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -158,6 +164,7 @@ Global
 	GlobalSection(NestedProjects) = preSolution
 		{418BE1BF-9F63-4B46-B4E4-DF64C3B3DDA7} = {F5878792-64C8-4ECF-A075-66341FF97127}
 		{9FE000D0-91AC-4CB4-8956-91CCC0270015} = {F5878792-64C8-4ECF-A075-66341FF97127}
+		{665C7B87-0165-48BC-B6A6-17A3812A70C9} = {F5878792-64C8-4ECF-A075-66341FF97127}
 		{AEE8B77E-AB07-423F-9981-8CD829ACB834} = {F5878792-64C8-4ECF-A075-66341FF97127}
 		{6C3DB1E5-F695-4D70-8F3A-78C2957274BE} = {01CB1A81-8950-471C-BFDF-F135FDDB2C18}
 		{95B55357-F8F0-48C2-A1C2-5EA997651783} = {01CB1A81-8950-471C-BFDF-F135FDDB2C18}

README.md

@@ -28,13 +28,10 @@ This project is **work-in-progress**, and currently has no official releases. Fe
 
 For a quick start, I recommend using [Docker](https://www.docker.com/) or another containerization platform. The `Dockerfile` in the root of the repository can build three target images: `phantom-web`, `phantom-controller`, and `phantom-agent`.
 
-All images put the built application into the `/app` folder. The Agent image also installs Java 8, 16, 17, and 21.
+All images put the built application into the `/app` folder. The Agent image also installs Java 8, 16, 17, and 18.
 
 Files are stored relative to the working directory. In the provided images, the working directory is set to `/data`.
 
-> [!IMPORTANT]
-> The 3 services communicate with each other using TLS. Due to inconsistent TLS support and implementation quirks between operating systems, Phantom Panel is intended to run only on Linux with up-to-date OpenSSL libraries. Support for other operating systems only exists for the purposes of local development, and components running on different operating systems may not be able to communicate with each other.
-
 ## Controller
 
 The Controller comprises 3 key areas:

Utils/Phantom.Utils.Logging/PhantomLogger.cs

@@ -35,19 +35,15 @@ public static class PhantomLogger {
 	}
 
 	public static ILogger Create<T>(string name) {
-		return Create(ConcatNames(typeof(T).Name, name));
+		return Create(typeof(T).Name, name);
 	}
 	
 	public static ILogger Create<T>(string name1, string name2) {
-		return Create(ConcatNames(typeof(T).Name, ConcatNames(name1, name2)));
+		return Create(typeof(T).Name, ConcatNames(name1, name2));
 	}
 
 	public static ILogger Create<T1, T2>() {
-		return Create(ConcatNames(typeof(T1).Name, typeof(T2).Name));
+		return Create(typeof(T1).Name, typeof(T2).Name);
-	}
-	
-	public static ILogger Create<T1, T2>(string name) {
-		return Create(ConcatNames(typeof(T1).Name, ConcatNames(typeof(T2).Name, name)));
 	}
 
 	private static string ConcatNames(string name1, string name2) {

Utils/Phantom.Utils.Rpc/AuthToken.cs

@@ -1,30 +0,0 @@
-using System.Collections.Immutable;
-using System.Security.Cryptography;
-
-namespace Phantom.Utils.Rpc;
-
-public sealed class AuthToken {
-	public const int Length = 12;
-	
-	public ImmutableArray<byte> Bytes { get; }
-	
-	public AuthToken(ImmutableArray<byte> bytes) {
-		if (bytes.Length != Length) {
-			throw new ArgumentOutOfRangeException(nameof(bytes), "Invalid token length: " + bytes.Length + ". Token length must be exactly " + Length + " bytes.");
-		}
-		
-		this.Bytes = bytes;
-	}
-	
-	public bool FixedTimeEquals(AuthToken providedAuthToken) {
-		return FixedTimeEquals(providedAuthToken.Bytes.AsSpan());
-	}
-	
-	public bool FixedTimeEquals(ReadOnlySpan<byte> other) {
-		return CryptographicOperations.FixedTimeEquals(Bytes.AsSpan(), other);
-	}
-	
-	public static AuthToken Generate() {
-		return new AuthToken([..RandomNumberGenerator.GetBytes(Length)]);
-	}
-}

Utils/Phantom.Utils.Rpc/Frame/IFrame.cs

@@ -1,51 +0,0 @@
-using Phantom.Utils.Rpc.Frame.Types;
-
-namespace Phantom.Utils.Rpc.Frame;
-
-interface IFrame {
-	private const byte TypePingId = 0;
-	private const byte TypeMessageId = 1;
-	private const byte TypeReplyId = 2;
-	private const byte TypeErrorId = 3;
-	
-	static readonly ReadOnlyMemory<byte> TypePing = new ([TypePingId]);
-	static readonly ReadOnlyMemory<byte> TypeMessage = new ([TypeMessageId]);
-	static readonly ReadOnlyMemory<byte> TypeReply = new ([TypeReplyId]);
-	static readonly ReadOnlyMemory<byte> TypeError = new ([TypeErrorId]);
-	
-	internal static async Task ReadFrom(Stream stream, IFrameReader reader, CancellationToken cancellationToken) {
-		byte[] oneByteBuffer = new byte[1];
-		
-		while (!cancellationToken.IsCancellationRequested) {
-			await stream.ReadExactlyAsync(oneByteBuffer, cancellationToken);
-			
-			switch (oneByteBuffer[0]) {
-				case TypePingId:
-					break;
-				
-				case TypeMessageId:
-					var messageFrame = await MessageFrame.Read(stream, cancellationToken);
-					await reader.OnMessageFrame(messageFrame, stream, cancellationToken);
-					break;
-				
-				case TypeReplyId:
-					var replyFrame = await ReplyFrame.Read(stream, cancellationToken);
-					reader.OnReplyFrame(replyFrame);
-					break;
-				
-				case TypeErrorId:
-					var errorFrame = await ErrorFrame.Read(stream, cancellationToken);
-					reader.OnErrorFrame(errorFrame);
-					break;
-				
-				default:
-					reader.OnUnknownFrameStart(oneByteBuffer[0]);
-					break;
-			}
-		}
-	}
-	
-	ReadOnlyMemory<byte> Type { get; }
-	
-	Task Write(Stream stream, CancellationToken cancellationToken = default);
-}

Utils/Phantom.Utils.Rpc/Frame/IFrameReader.cs

@@ -1,10 +0,0 @@
-using Phantom.Utils.Rpc.Frame.Types;
-
-namespace Phantom.Utils.Rpc.Frame;
-
-interface IFrameReader {
-	Task OnMessageFrame(MessageFrame frame, Stream stream, CancellationToken cancellationToken);
-	void OnReplyFrame(ReplyFrame frame);
-	void OnErrorFrame(ErrorFrame frame);
-	void OnUnknownFrameStart(byte id);
-}

Utils/Phantom.Utils.Rpc/Frame/Types/ErrorFrame.cs

@@ -1,18 +0,0 @@
-using Phantom.Utils.Rpc.Runtime;
-
-namespace Phantom.Utils.Rpc.Frame.Types;
-
-sealed record ErrorFrame(uint ReplyingToMessageId, RpcError Error) : IFrame {
-	public ReadOnlyMemory<byte> Type => IFrame.TypeError;
-	
-	public async Task Write(Stream stream, CancellationToken cancellationToken) {
-		await Serialization.WriteUnsignedInt(ReplyingToMessageId, stream, cancellationToken);
-		await Serialization.WriteByte((byte) Error, stream, cancellationToken);
-	}
-	
-	public static async Task<ErrorFrame> Read(Stream stream, CancellationToken cancellationToken) {
-		var replyingToMessageId = await Serialization.ReadUnsignedInt(stream, cancellationToken);
-		var messageError = (RpcError) await Serialization.ReadByte(stream, cancellationToken);
-		return new ErrorFrame(replyingToMessageId, messageError);
-	}
-}

Utils/Phantom.Utils.Rpc/Frame/Types/MessageFrame.cs

@@ -1,39 +0,0 @@
-using Phantom.Utils.Rpc.Runtime;
-
-namespace Phantom.Utils.Rpc.Frame.Types;
-
-sealed record MessageFrame(uint MessageId, ushort RegistryCode, ReadOnlyMemory<byte> SerializedMessage) : IFrame {
-	public const int MaxMessageBytes = 1024 * 1024 * 8;
-	
-	public ReadOnlyMemory<byte> Type => IFrame.TypeMessage;
-	
-	public async Task Write(Stream stream, CancellationToken cancellationToken) {
-		int messageLength = SerializedMessage.Length;
-		CheckMessageLength(messageLength);
-		
-		await Serialization.WriteUnsignedInt(MessageId, stream, cancellationToken);
-		await Serialization.WriteUnsignedShort(RegistryCode, stream, cancellationToken);
-		await Serialization.WriteSignedInt(messageLength, stream, cancellationToken);
-		await stream.WriteAsync(SerializedMessage, cancellationToken);
-	}
-	
-	public static async Task<MessageFrame> Read(Stream stream, CancellationToken cancellationToken) {
-		var messageId = await Serialization.ReadUnsignedInt(stream, cancellationToken);
-		var registryCode = await Serialization.ReadUnsignedShort(stream, cancellationToken);
-		var essageLength = await Serialization.ReadSignedInt(stream, cancellationToken);
-		CheckMessageLength(essageLength);
-		var serializedMessage = await Serialization.ReadBytes(essageLength, stream, cancellationToken);
-		
-		return new MessageFrame(messageId, registryCode, serializedMessage);
-	}
-	
-	private static void CheckMessageLength(int messageLength) {
-		if (messageLength < 0) {
-			throw new RpcErrorException("Message length is negative.", RpcError.InvalidData);
-		}
-		
-		if (messageLength > MaxMessageBytes) {
-			throw new RpcErrorException("Message is too large: " + messageLength + " > " + MaxMessageBytes + " bytes", RpcError.MessageTooLarge);
-		}
-	}
-}

Utils/Phantom.Utils.Rpc/Frame/Types/PingFrame.cs

@@ -1,11 +0,0 @@
-namespace Phantom.Utils.Rpc.Frame.Types;
-
-sealed record PingFrame : IFrame {
-	public static PingFrame Instance { get; } = new PingFrame();
-	
-	public ReadOnlyMemory<byte> Type => IFrame.TypePing;
-	
-	public Task Write(Stream stream, CancellationToken cancellationToken) {
-		return Task.CompletedTask;
-	}
-}

Utils/Phantom.Utils.Rpc/Frame/Types/ReplyFrame.cs

@@ -1,37 +0,0 @@
-using Phantom.Utils.Rpc.Runtime;
-
-namespace Phantom.Utils.Rpc.Frame.Types;
-
-sealed record ReplyFrame(uint ReplyingToMessageId, ReadOnlyMemory<byte> SerializedReply) : IFrame {
-	public const int MaxReplyBytes = 1024 * 1024 * 32;
-	
-	public ReadOnlyMemory<byte> Type => IFrame.TypeReply;
-	
-	public async Task Write(Stream stream, CancellationToken cancellationToken) {
-		int replyLength = SerializedReply.Length;
-		CheckReplyLength(replyLength);
-		
-		await Serialization.WriteUnsignedInt(ReplyingToMessageId, stream, cancellationToken);
-		await Serialization.WriteSignedInt(replyLength, stream, cancellationToken);
-		await stream.WriteAsync(SerializedReply, cancellationToken);
-	}
-	
-	public static async Task<ReplyFrame> Read(Stream stream, CancellationToken cancellationToken) {
-		var replyingToMessageId = await Serialization.ReadUnsignedInt(stream, cancellationToken);
-		var replyLength = await Serialization.ReadSignedInt(stream, cancellationToken);
-		CheckReplyLength(replyLength);
-		var reply = await Serialization.ReadBytes(replyLength, stream, cancellationToken);
-		
-		return new ReplyFrame(replyingToMessageId, reply);
-	}
-	
-	private static void CheckReplyLength(int replyLength) {
-		if (replyLength < 0) {
-			throw new RpcErrorException("Reply length is negative.", RpcError.InvalidData);
-		}
-		
-		if (replyLength > MaxReplyBytes) {
-			throw new RpcErrorException("Reply is too large: " + replyLength + " > " + MaxReplyBytes + " bytes", RpcError.MessageTooLarge);
-		}
-	}
-}

Utils/Phantom.Utils.Rpc/Message/IMessageDefinitions.cs

@@ -1,6 +1,6 @@
 namespace Phantom.Utils.Rpc.Message;
 
-public interface IMessageDefinitions<TClientToServerMessage, TServerToClientMessage> {
+public interface IMessageDefinitions<TClientMessage, TServerMessage, TReplyMessage> : IReplyMessageFactory<TReplyMessage> where TReplyMessage : TClientMessage, TServerMessage {
-	MessageRegistry<TServerToClientMessage> ToClient { get; }
+	MessageRegistry<TClientMessage> ToClient { get; }
-	MessageRegistry<TClientToServerMessage> ToServer { get; }
+	MessageRegistry<TServerMessage> ToServer { get; }
 }

Utils/Phantom.Utils.Rpc/Message/IReply.cs

@@ -0,0 +1,6 @@
+namespace Phantom.Utils.Rpc.Message;
+
+public interface IReply {
+	uint SequenceId { get; }
+	byte[] SerializedReply { get; }
+}

Utils/Phantom.Utils.Rpc/Message/IReplyMessageFactory.cs

@@ -0,0 +1,5 @@
+namespace Phantom.Utils.Rpc.Message;
+
+public interface IReplyMessageFactory<TReplyMessage> {
+	TReplyMessage CreateReplyMessage(uint sequenceId, byte[] serializedReply);
+}

Utils/Phantom.Utils.Rpc/Message/IReplySender.cs

@@ -0,0 +1,5 @@
+namespace Phantom.Utils.Rpc.Message;
+
+interface IReplySender {
+	Task SendReply(uint sequenceId, byte[] serializedReply);
+}

Utils/Phantom.Utils.Rpc/Message/MessageHandler.cs

@@ -1,11 +1,35 @@
 using Phantom.Utils.Actor;
-using Phantom.Utils.Rpc.Runtime;
+using Phantom.Utils.Logging;
+using Serilog;
 
 namespace Phantom.Utils.Rpc.Message;
 
-interface MessageHandler<TMessageBase> {
+sealed class MessageHandler<TMessageBase> {
-	ActorRef<TMessageBase> Actor { get; }
+	private readonly ILogger logger;
+	private readonly ActorRef<TMessageBase> handlerActor;
+	private readonly IReplySender replySender;
 	
-	ValueTask OnReply<TMessage, TReply>(uint messageId, TReply reply, CancellationToken cancellationToken) where TMessage : TMessageBase, ICanReply<TReply>;
+	public MessageHandler(string loggerName, ActorRef<TMessageBase> handlerActor, IReplySender replySender) {
-	ValueTask OnError(uint messageId, RpcError error, CancellationToken cancellationToken);
+		this.logger = PhantomLogger.Create("MessageHandler", loggerName);
+		this.handlerActor = handlerActor;
+		this.replySender = replySender;
+	}
+
+	public void Tell(TMessageBase message) {
+		handlerActor.Tell(message);
+	}
+	
+	public Task TellAndReply<TMessage, TReply>(TMessage message, uint sequenceId) where TMessage : ICanReply<TReply> {
+		return handlerActor.Request(message).ContinueWith(task => {
+			if (task.IsCompletedSuccessfully) {
+				return replySender.SendReply(sequenceId, MessageSerializer.Serialize(task.Result));
+			}
+			
+			if (task.IsFaulted) {
+				logger.Error(task.Exception, "Failed to handle message {Type}.", message.GetType().Name);
+			}
+			
+			return task;
+		}, TaskScheduler.Default);
+	}
 }

Utils/Phantom.Utils.Rpc/Message/MessageRegistry.cs

@@ -1,18 +1,26 @@
-using Phantom.Utils.Actor;
+using System.Buffers;
-using Phantom.Utils.Rpc.Frame.Types;
+using System.Diagnostics.CodeAnalysis;
-using Phantom.Utils.Rpc.Runtime;
+using Phantom.Utils.Actor;
 using Serilog;
+using Serilog.Events;
 
 namespace Phantom.Utils.Rpc.Message;
 
-public sealed class MessageRegistry<TMessageBase>(ILogger logger) {
+public sealed class MessageRegistry<TMessageBase> {
+	private const int DefaultBufferSize = 512;
+
+	private readonly ILogger logger;
 	private readonly Dictionary<Type, ushort> typeToCodeMapping = new ();
 	private readonly Dictionary<ushort, Type> codeToTypeMapping = new ();
-	private readonly Dictionary<ushort, Func<uint, ReadOnlyMemory<byte>, MessageHandler<TMessageBase>, CancellationToken, Task>> codeToHandlerMapping = new ();
+	private readonly Dictionary<ushort, Action<ReadOnlyMemory<byte>, ushort, MessageHandler<TMessageBase>>> codeToHandlerMapping = new ();
+
+	public MessageRegistry(ILogger logger) {
+		this.logger = logger;
+	}
 
 	public void Add<TMessage>(ushort code) where TMessage : TMessageBase {
 		if (HasReplyType(typeof(TMessage))) {
-			throw new ArgumentException("This overload is for messages without a reply.");
+			throw new ArgumentException("This overload is for messages without a reply");
 		}
 		
 		AddTypeCodeMapping<TMessage>(code);
@@ -36,64 +44,140 @@ public sealed class MessageRegistry<TMessageBase>(ILogger logger) {
 		return messageType.GetInterfaces().Any(type => type.FullName is {} name && name.StartsWith(replyInterfaceName, StringComparison.Ordinal));
 	}
 	
-	internal MessageFrame CreateFrame<TMessage>(uint messageId, TMessage message) where TMessage : TMessageBase {
+	internal bool TryGetType(ReadOnlyMemory<byte> data, [NotNullWhen(true)] out Type? type) {
-		if (typeToCodeMapping.TryGetValue(typeof(TMessage), out ushort code)) {
+		try {
-			return new MessageFrame(messageId, code, Serialization.Serialize(message));
+			var code = MessageSerializer.ReadCode(ref data);
+			return codeToTypeMapping.TryGetValue(code, out type);
+		} catch (Exception) {
+			type = null;
+			return false;
+		}
+	}
+
+	public ReadOnlySpan<byte> Write<TMessage>(TMessage message) where TMessage : TMessageBase {
+		if (!GetMessageCode<TMessage>(out var code)) {
+			return default;
+		}
+		
+		var buffer = new ArrayBufferWriter<byte>(DefaultBufferSize);
+
+		try {
+			MessageSerializer.WriteCode(buffer, code);
+			MessageSerializer.Serialize(buffer, message);
+
+			CheckWrittenBufferLength<TMessage>(buffer);
+			return buffer.WrittenSpan;
+		} catch (Exception e) {
+			LogWriteFailure<TMessage>(e);
+			return default;
+		}
+	}
+
+	public ReadOnlySpan<byte> Write<TMessage, TReply>(uint sequenceId, TMessage message) where TMessage : TMessageBase, ICanReply<TReply> {
+		if (!GetMessageCode<TMessage>(out var code)) {
+			return default;
+		}
+
+		var buffer = new ArrayBufferWriter<byte>(DefaultBufferSize);
+
+		try {
+			MessageSerializer.WriteCode(buffer, code);
+			MessageSerializer.WriteSequenceId(buffer, sequenceId);
+			MessageSerializer.Serialize(buffer, message);
+
+			CheckWrittenBufferLength<TMessage>(buffer);
+			return buffer.WrittenSpan;
+		} catch (Exception e) {
+			LogWriteFailure<TMessage>(e);
+			return default;
+		}
+	}
+
+	private bool GetMessageCode<TMessage>(out ushort code) where TMessage : TMessageBase {
+		if (typeToCodeMapping.TryGetValue(typeof(TMessage), out code)) {
+			return true;
 		}
 		else {
-			throw new ArgumentException("Unknown message type: " + typeof(TMessage));
+			logger.Error("Unknown message type {Type}.", typeof(TMessage));
+			return false;
 		}
 	}
 
-	internal async Task Handle(MessageFrame frame, MessageHandler<TMessageBase> handler, CancellationToken cancellationToken) {
+	private void CheckWrittenBufferLength<TMessage>(ArrayBufferWriter<byte> buffer) where TMessage : TMessageBase {
-		uint messageId = frame.MessageId;
+		if (buffer.WrittenCount > DefaultBufferSize && logger.IsEnabled(LogEventLevel.Verbose)) {
+			logger.Verbose("Serializing {Type} exceeded default buffer size: {WrittenSize} B > {DefaultBufferSize} B", typeof(TMessage).Name, buffer.WrittenCount, DefaultBufferSize);
+		}
+	}
 
-		if (codeToHandlerMapping.TryGetValue(frame.RegistryCode, out var action)) {
+	private void LogWriteFailure<TMessage>(Exception e) where TMessage : TMessageBase {
-			await action(messageId, frame.SerializedMessage, handler, cancellationToken);
+		logger.Error(e, "Failed to serialize message {Type}.", typeof(TMessage).Name);
+	}
+
+	internal bool Read<TMessage>(ReadOnlyMemory<byte> data, out TMessage message) where TMessage : TMessageBase {
+		if (ReadTypeCode(ref data, out ushort code) && codeToTypeMapping.TryGetValue(code, out var expectedType) && expectedType == typeof(TMessage) && ReadMessage(data, out message)) {
+			return true;
 		}
 		else {
-			logger.Error("Unknown message code {Code} for message {MessageId}.", frame.RegistryCode, messageId);
+			message = default!;
-			await handler.OnError(messageId, RpcError.UnknownMessageRegistryCode, cancellationToken);
+			return false;
 		}
 	}
 
-	private async Task DeserializationHandler<TMessage>(uint messageId, ReadOnlyMemory<byte> serializedMessage, MessageHandler<TMessageBase> handler, CancellationToken cancellationToken) where TMessage : TMessageBase {
+	internal void Handle(ReadOnlyMemory<byte> data, MessageHandler<TMessageBase> handler) {
-		TMessage message;
+		if (!ReadTypeCode(ref data, out var code)) {
-		try {
-			message = Serialization.Deserialize<TMessage>(serializedMessage);
-		} catch (Exception e) {
-			logger.Error(e, "Could not deserialize message {MessageId} ({MessageType}).", messageId, typeof(TMessage).Name);
-			await handler.OnError(messageId, RpcError.MessageDeserializationError, cancellationToken);
 			return;
 		}
 
-		handler.Actor.Tell(message);
+		if (!codeToHandlerMapping.TryGetValue(code, out var handle)) {
-	}
+			logger.Error("Unknown message code {Code}.", code);
-	
-	private async Task DeserializationHandler<TMessage, TReply>(uint messageId, ReadOnlyMemory<byte> serializedMessage, MessageHandler<TMessageBase> handler, CancellationToken cancellationToken) where TMessage : TMessageBase, ICanReply<TReply> {
-		TMessage message;
-		try {
-			message = Serialization.Deserialize<TMessage>(serializedMessage);
-		} catch (Exception e) {
-			logger.Error(e, "Could not deserialize message {MessageId} ({MessageType}).", messageId, typeof(TMessage).Name);
-			await handler.OnError(messageId, RpcError.MessageDeserializationError, cancellationToken);
 			return;
 		}
 
-		TReply reply;
+		handle(data, code, handler);
-		try {
-			reply = await handler.Actor.Request(message, cancellationToken);
-		} catch (Exception e) {
-			logger.Error(e, "Could not handle message {MessageId} ({MessageType}).", messageId, typeof(TMessage).Name);
-			await handler.OnError(messageId, RpcError.MessageHandlingError, cancellationToken);
-			return;
 	}
 
+	private bool ReadTypeCode(ref ReadOnlyMemory<byte> data, out ushort code) {
 		try {
-			await handler.OnReply<TMessage, TReply>(messageId, reply, cancellationToken);
+			code = MessageSerializer.ReadCode(ref data);
+			return true;
 		} catch (Exception e) {
-			logger.Error(e, "Could not reply to message {MessageId} ({MessageType}).", messageId, typeof(TMessage).Name);
+			code = default;
-			await handler.OnError(messageId, RpcError.MessageHandlingError, cancellationToken);
+			logger.Error(e, "Failed to deserialize message code.");
+			return false;
+		}
+	}
+
+	private bool ReadSequenceId<TMessage, TReply>(ref ReadOnlyMemory<byte> data, out uint sequenceId) where TMessage : TMessageBase, ICanReply<TReply> {
+		try {
+			sequenceId = MessageSerializer.ReadSequenceId(ref data);
+			return true;
+		} catch (Exception e) {
+			sequenceId = default;
+			logger.Error(e, "Failed to deserialize sequence ID of message {Type}.", typeof(TMessage).Name);
+			return false;
+		}
+	}
+
+	private bool ReadMessage<TMessage>(ReadOnlyMemory<byte> data, out TMessage message) where TMessage : TMessageBase {
+		try {
+			message = MessageSerializer.Deserialize<TMessage>(data);
+			return true;
+		} catch (Exception e) {
+			message = default!;
+			logger.Error(e, "Failed to deserialize message {Type}.", typeof(TMessage).Name);
+			return false;
+		}
+	}
+
+	private void DeserializationHandler<TMessage>(ReadOnlyMemory<byte> data, ushort code, MessageHandler<TMessageBase> handler) where TMessage : TMessageBase {
+		if (ReadMessage<TMessage>(data, out var message)) {
+			handler.Tell(message);
+		}
+	}
+
+	private void DeserializationHandler<TMessage, TReply>(ReadOnlyMemory<byte> data, ushort code, MessageHandler<TMessageBase> handler) where TMessage : TMessageBase, ICanReply<TReply> {
+		if (ReadSequenceId<TMessage, TReply>(ref data, out var sequenceId) && ReadMessage<TMessage>(data, out var message)) {
+			handler.TellAndReply<TMessage, TReply>(message, sequenceId);
 		}
 	}
 }

Utils/Phantom.Utils.Rpc/Message/MessageReplyTracker.cs

@@ -1,6 +1,5 @@
 using System.Collections.Concurrent;
 using Phantom.Utils.Logging;
-using Phantom.Utils.Rpc.Runtime;
 using Phantom.Utils.Tasks;
 using Serilog;
 
@@ -8,57 +7,55 @@ namespace Phantom.Utils.Rpc.Message;
 
 sealed class MessageReplyTracker {
 	private readonly ILogger logger;
-	private readonly ConcurrentDictionary<uint, TaskCompletionSource<ReadOnlyMemory<byte>>> replyTasks = new (concurrencyLevel: 4, capacity: 16);
+	private readonly ConcurrentDictionary<uint, TaskCompletionSource<byte[]>> replyTasks = new (4, 16);
+	
+	private uint lastSequenceId;
 
 	internal MessageReplyTracker(string loggerName) {
 		this.logger = PhantomLogger.Create<MessageReplyTracker>(loggerName);
 	}
 
-	public void RegisterReply(uint messageId) {
+	public uint RegisterReply() {
-		replyTasks[messageId] = AsyncTasks.CreateCompletionSource<ReadOnlyMemory<byte>>();
+		var sequenceId = Interlocked.Increment(ref lastSequenceId);
+		replyTasks[sequenceId] = AsyncTasks.CreateCompletionSource<byte[]>();
+		return sequenceId;
 	}
 
-	public async Task<TReply> WaitForReply<TReply>(uint messageId, TimeSpan waitForReplyTime, CancellationToken cancellationToken) {
+	public async Task<TReply> WaitForReply<TReply>(uint sequenceId, TimeSpan waitForReplyTime, CancellationToken cancellationToken) {
-		if (!replyTasks.TryGetValue(messageId, out var completionSource)) {
+		if (!replyTasks.TryGetValue(sequenceId, out var completionSource)) {
-			logger.Warning("No reply callback for id {MessageId}.", messageId);
+			logger.Warning("No reply callback for id {SequenceId}.", sequenceId);
-			throw new ArgumentException("No reply callback for id: " + messageId, nameof(messageId));
+			throw new ArgumentException("No reply callback for id: " + sequenceId, nameof(sequenceId));
 		}
 		
 		try {
-			ReadOnlyMemory<byte> serializedReply = await completionSource.Task.WaitAsync(waitForReplyTime, cancellationToken);
+			byte[] replyBytes = await completionSource.Task.WaitAsync(waitForReplyTime, cancellationToken);
-			return Serialization.Deserialize<TReply>(serializedReply);
+			return MessageSerializer.Deserialize<TReply>(replyBytes);
 		} catch (TimeoutException) {
-			logger.Debug("Timed out waiting for reply with id {MessageId}.", messageId);
+			logger.Debug("Timed out waiting for reply with id {SequenceId}.", sequenceId);
 			throw;
 		} catch (OperationCanceledException) {
-			logger.Debug("Cancelled waiting for reply with id {MessageId}.", messageId);
+			logger.Debug("Cancelled waiting for reply with id {SequenceId}.", sequenceId);
 			throw;
 		} catch (Exception e) {
-			logger.Warning(e, "Error processing reply with id {MessageId}.", messageId);
+			logger.Warning(e, "Error processing reply with id {SequenceId}.", sequenceId);
 			throw;
 		} finally {
-			ForgetReply(messageId);
+			ForgetReply(sequenceId);
 		}
 	}
 
-	public void ForgetReply(uint messageId) {
+	public void ForgetReply(uint sequenceId) {
-		if (replyTasks.TryRemove(messageId, out var task)) {
+		if (replyTasks.TryRemove(sequenceId, out var task)) {
 			task.SetCanceled();
 		}
 	}
 
-	public void FailReply(uint messageId, RpcErrorException e) {
+	public void ReceiveReply(uint sequenceId, byte[] serializedReply) {
-		if (replyTasks.TryRemove(messageId, out var task)) {
+		if (replyTasks.TryRemove(sequenceId, out var task)) {
-			task.SetException(e);
-		}
-	}
-	
-	public void ReceiveReply(uint messageId, ReadOnlyMemory<byte> serializedReply) {
-		if (replyTasks.TryRemove(messageId, out var task)) {
 			task.SetResult(serializedReply);
 		}
 		else {
-			logger.Warning("Received a reply with id {MessageId} but no registered callback.", messageId);
+			logger.Warning("Received a reply with id {SequenceId} but no registered callback.", sequenceId);
 		}
 	}
 }

Utils/Phantom.Utils.Rpc/Message/MessageSerializer.cs

@@ -0,0 +1,45 @@
+using System.Buffers;
+using System.Buffers.Binary;
+using MemoryPack;
+
+namespace Phantom.Utils.Rpc.Message;
+
+static class MessageSerializer {
+	private static readonly MemoryPackSerializerOptions SerializerOptions = MemoryPackSerializerOptions.Utf8;
+
+	public static byte[] Serialize<T>(T message) {
+		return MemoryPackSerializer.Serialize(message, SerializerOptions);
+	}
+
+	public static void Serialize<T>(IBufferWriter<byte> destination, T message) {
+		MemoryPackSerializer.Serialize(typeof(T), destination, message, SerializerOptions);
+	}
+
+	public static T Deserialize<T>(ReadOnlyMemory<byte> memory) {
+		return MemoryPackSerializer.Deserialize<T>(memory.Span) ?? throw new NullReferenceException();
+	}
+	
+	public static void WriteCode(IBufferWriter<byte> destination, ushort value) {
+		Span<byte> buffer = stackalloc byte[2];
+		BinaryPrimitives.WriteUInt16LittleEndian(buffer, value);
+		destination.Write(buffer);
+	}
+
+	public static ushort ReadCode(ref ReadOnlyMemory<byte> memory) {
+		ushort value = BinaryPrimitives.ReadUInt16LittleEndian(memory.Span);
+		memory = memory[2..];
+		return value;
+	}
+
+	public static void WriteSequenceId(IBufferWriter<byte> destination, uint sequenceId) {
+		Span<byte> buffer = stackalloc byte[4];
+		BinaryPrimitives.WriteUInt32LittleEndian(buffer, sequenceId);
+		destination.Write(buffer);
+	}
+	
+	public static uint ReadSequenceId(ref ReadOnlyMemory<byte> memory) {
+		uint value = BinaryPrimitives.ReadUInt32LittleEndian(memory.Span);
+		memory = memory[4..];
+		return value;
+	}
+}

Utils/Phantom.Utils.Rpc/Message/ReplySender.cs

@@ -0,0 +1,17 @@
+using Phantom.Utils.Rpc.Runtime;
+
+namespace Phantom.Utils.Rpc.Message;
+
+sealed class ReplySender<TMessageBase, TReplyMessage> : IReplySender where TReplyMessage : TMessageBase {
+	private readonly RpcConnection<TMessageBase> connection;
+	private readonly IReplyMessageFactory<TReplyMessage> replyMessageFactory;
+
+	public ReplySender(RpcConnection<TMessageBase> connection, IReplyMessageFactory<TReplyMessage> replyMessageFactory) {
+		this.connection = connection;
+		this.replyMessageFactory = replyMessageFactory;
+	}
+
+	public Task SendReply(uint sequenceId, byte[] serializedReply) {
+		return connection.Send(replyMessageFactory.CreateReplyMessage(sequenceId, serializedReply));
+	}
+}

Utils/Phantom.Utils.Rpc/RpcConfiguration.cs

@@ -0,0 +1,8 @@
+using NetMQ;
+
+namespace Phantom.Utils.Rpc;
+
+public sealed record RpcConfiguration(string ServiceName, string Host, ushort Port, NetMQCertificate ServerCertificate) {
+	internal string LoggerName => "Rpc:" + ServiceName;
+	internal string TcpUrl => "tcp://" + Host + ":" + Port;
+}

Utils/Phantom.Utils.Rpc/RpcExtensions.cs

@@ -0,0 +1,32 @@
+using NetMQ;
+using NetMQ.Sockets;
+
+namespace Phantom.Utils.Rpc;
+
+static class RpcExtensions {
+	public static ReadOnlyMemory<byte> Receive(this ClientSocket socket, CancellationToken cancellationToken) {
+		var msg = new Msg();
+		msg.InitEmpty();
+		
+		try {
+			socket.Receive(ref msg, cancellationToken);
+			return msg.SliceAsMemory();
+		} finally {
+			// Only releases references, so the returned ReadOnlyMemory is safe.
+			msg.Close();
+		}
+	}
+	
+	public static (uint, ReadOnlyMemory<byte>) Receive(this ServerSocket socket, CancellationToken cancellationToken) {
+		var msg = new Msg();
+		msg.InitEmpty();
+		
+		try {
+			socket.Receive(ref msg, cancellationToken);
+			return (msg.RoutingId, msg.SliceAsMemory());
+		} finally {
+			// Only releases references, so the returned ReadOnlyMemory is safe.
+			msg.Close();
+		}
+	}
+}

Utils/Phantom.Utils.Rpc/Runtime/Client/RpcClient.cs

@@ -1,95 +0,0 @@
-using Phantom.Utils.Actor;
-using Phantom.Utils.Logging;
-using Phantom.Utils.Rpc.Frame;
-using Phantom.Utils.Rpc.Frame.Types;
-using Phantom.Utils.Rpc.Message;
-using Serilog;
-
-namespace Phantom.Utils.Rpc.Runtime.Client;
-
-public sealed class RpcClient<TClientToServerMessage, TServerToClientMessage> : IDisposable {
-	public static async Task<RpcClient<TClientToServerMessage, TServerToClientMessage>?> Connect(string loggerName, RpcClientConnectionParameters connectionParameters, IMessageDefinitions<TClientToServerMessage, TServerToClientMessage> messageDefinitions, CancellationToken cancellationToken) {
-		RpcClientConnector connector = new RpcClientConnector(loggerName, connectionParameters);
-		RpcClientConnector.Connection? connection = await connector.EstablishNewConnection(cancellationToken);
-		return connection == null ? null : new RpcClient<TClientToServerMessage, TServerToClientMessage>(loggerName, connectionParameters, messageDefinitions, connector, connection);
-	}
-	
-	private readonly ILogger logger;
-	private readonly MessageRegistry<TServerToClientMessage> serverToClientMessageRegistry;
-	private readonly RpcClientConnection connection;
-	
-	public RpcSendChannel<TClientToServerMessage> SendChannel { get; }
-	
-	private RpcClient(string loggerName, RpcClientConnectionParameters connectionParameters, IMessageDefinitions<TClientToServerMessage, TServerToClientMessage> messageDefinitions, RpcClientConnector connector, RpcClientConnector.Connection connection) {
-		this.logger = PhantomLogger.Create<RpcClient<TClientToServerMessage, TServerToClientMessage>>(loggerName);
-		this.serverToClientMessageRegistry = messageDefinitions.ToClient;
-		
-		this.connection = new RpcClientConnection(loggerName, connector, connection);
-		this.SendChannel = new RpcSendChannel<TClientToServerMessage>(loggerName, connectionParameters, this.connection, messageDefinitions.ToServer);
-	}
-	
-	public async Task Listen(ActorRef<TServerToClientMessage> actor) {
-		try {
-			await connection.ReadConnection(stream => Receive(stream, new MessageHandlerImpl(SendChannel, actor)));
-		} catch (OperationCanceledException) {
-			// Ignore.
-		}
-	}
-	
-	private async Task Receive(Stream stream, MessageHandlerImpl handler) {
-		await IFrame.ReadFrom(stream, new FrameReader(this, handler), CancellationToken.None);
-	}
-	
-	private sealed class FrameReader(RpcClient<TClientToServerMessage, TServerToClientMessage> client, MessageHandlerImpl handler) : IFrameReader {
-		public Task OnMessageFrame(MessageFrame frame, Stream stream, CancellationToken cancellationToken) {
-			return client.serverToClientMessageRegistry.Handle(frame, handler, cancellationToken);
-		}
-		
-		public void OnReplyFrame(ReplyFrame frame) {
-			client.SendChannel.ReceiveReply(frame);
-		}
-		
-		public void OnErrorFrame(ErrorFrame frame) {
-			client.SendChannel.ReceiveError(frame.ReplyingToMessageId, frame.Error);
-		}
-		
-		public void OnUnknownFrameStart(byte id) {
-			client.logger.Error("Received unknown frame ID: {Id}", id);
-		}
-	}
-	
-	private sealed class MessageHandlerImpl(RpcSendChannel<TClientToServerMessage> sendChannel, ActorRef<TServerToClientMessage> actor) : MessageHandler<TServerToClientMessage> {
-		public ActorRef<TServerToClientMessage> Actor => actor;
-		
-		public ValueTask OnReply<TMessage, TReply>(uint messageId, TReply reply, CancellationToken cancellationToken) where TMessage : TServerToClientMessage, ICanReply<TReply> {
-			return sendChannel.SendReply(messageId, reply, cancellationToken);
-		}
-		
-		public ValueTask OnError(uint messageId, RpcError error, CancellationToken cancellationToken) {
-			return sendChannel.SendError(messageId, error, cancellationToken);
-		}
-	}
-	
-	public async Task Shutdown() {
-		logger.Information("Shutting down client...");
-		
-		try {
-			await SendChannel.Close();
-		} catch (Exception e) {
-			logger.Error(e, "Caught exception while closing send channel.");
-		}
-		
-		try {
-			connection.Close();
-		} catch (Exception e) {
-			logger.Error(e, "Caught exception while closing connection.");
-		}
-		
-		logger.Information("Client shut down.");
-	}
-	
-	public void Dispose() {
-		connection.Dispose();
-		SendChannel.Dispose();
-	}
-}

Utils/Phantom.Utils.Rpc/Runtime/Client/RpcClientConnection.cs

@@ -1,85 +0,0 @@
-using Phantom.Utils.Logging;
-using Serilog;
-
-namespace Phantom.Utils.Rpc.Runtime.Client;
-
-sealed class RpcClientConnection(string loggerName, RpcClientConnector connector, RpcClientConnector.Connection initialConnection) : IRpcConnectionProvider, IDisposable {
-	private readonly ILogger logger = PhantomLogger.Create<RpcClientConnection>(loggerName);
-	
-	private readonly SemaphoreSlim semaphore = new (1);
-	private RpcClientConnector.Connection currentConnection = initialConnection;
-	
-	private readonly CancellationTokenSource newConnectionCancellationTokenSource = new ();
-	
-	public async Task<Stream> GetStream() {
-		return (await GetConnection()).Stream;
-	}
-	
-	private async Task<RpcClientConnector.Connection> GetConnection() {
-		CancellationToken cancellationToken = newConnectionCancellationTokenSource.Token;
-		
-		await semaphore.WaitAsync(cancellationToken);
-		try {
-			if (!currentConnection.Socket.Connected) {
-				currentConnection = await connector.EstablishNewConnectionWithRetry(cancellationToken);
-			}
-			
-			return currentConnection;
-		} finally {
-			semaphore.Release();
-		}
-	}
-	
-	public async Task ReadConnection(Func<Stream, Task> reader) {
-		RpcClientConnector.Connection? connection = null;
-		
-		try {
-			while (true) {
-				connection?.Dispose();
-				connection = null;
-				
-				try {
-					connection = await GetConnection();
-				} catch (OperationCanceledException) {
-					throw;
-				} catch (Exception e) {
-					logger.Warning(e, "Could not obtain a new connection.");
-					continue;
-				}
-				
-				try {
-					await reader(connection.Stream);
-				} catch (OperationCanceledException) {
-					throw;
-				} catch (EndOfStreamException) {
-					logger.Warning("Socket was closed.");
-				} catch (Exception e) {
-					logger.Error(e, "Closing socket due to an exception while reading it.");
-					
-					try {
-						await connection.Shutdown();
-					} catch (Exception e2) {
-						logger.Error(e2, "Caught exception closing the socket.");
-					}
-				}
-			}
-		} finally {
-			if (connection != null) {
-				try {
-					await connection.Disconnect(); // TODO what happens if already disconnected?
-				} finally {
-					connection.Dispose();
-				}
-			}
-		}
-	}
-	
-	public void Close() {
-		newConnectionCancellationTokenSource.Cancel();
-	}
-	
-	public void Dispose() {
-		semaphore.Dispose();
-		newConnectionCancellationTokenSource.Dispose();
-	}
-}

Utils/Phantom.Utils.Rpc/Runtime/Client/RpcClientConnectionParameters.cs

@@ -1,13 +0,0 @@
-using Phantom.Utils.Rpc.Runtime.Tls;
-
-namespace Phantom.Utils.Rpc.Runtime.Client;
-
-public readonly record struct RpcClientConnectionParameters(
-	string Host,
-	ushort Port,
-	string DistinguishedName,
-	RpcCertificateThumbprint CertificateThumbprint,
-	AuthToken AuthToken,
-	ushort SendQueueCapacity,
-	TimeSpan PingInterval
-);

Utils/Phantom.Utils.Rpc/Runtime/Client/RpcClientConnector.cs

@@ -1,190 +0,0 @@
-using System.Net.Security;
-using System.Net.Sockets;
-using System.Security.Authentication;
-using System.Security.Cryptography.X509Certificates;
-using Phantom.Utils.Collections;
-using Phantom.Utils.Logging;
-using Phantom.Utils.Rpc.Runtime.Tls;
-using Serilog;
-
-namespace Phantom.Utils.Rpc.Runtime.Client;
-
-internal sealed class RpcClientConnector {
-	private static readonly TimeSpan InitialRetryDelay = TimeSpan.FromMilliseconds(100);
-	private static readonly TimeSpan MaximumRetryDelay = TimeSpan.FromSeconds(30);
-	private static readonly TimeSpan DisconnectTimeout = TimeSpan.FromSeconds(10);
-	
-	private readonly ILogger logger;
-	private readonly Guid sessionId;
-	private readonly RpcClientConnectionParameters parameters;
-	private readonly SslClientAuthenticationOptions sslOptions;
-	
-	private bool loggedCertificateValidationError = false;
-	
-	public RpcClientConnector(string loggerName, RpcClientConnectionParameters parameters) {
-		this.logger = PhantomLogger.Create<RpcClientConnector>(loggerName);
-		this.sessionId = Guid.NewGuid();
-		this.parameters = parameters;
-		
-		this.sslOptions = new SslClientAuthenticationOptions {
-			AllowRenegotiation = false,
-			AllowTlsResume = true,
-			CertificateRevocationCheckMode = X509RevocationMode.NoCheck,
-			EnabledSslProtocols = TlsSupport.SupportedProtocols,
-			EncryptionPolicy = EncryptionPolicy.RequireEncryption,
-			RemoteCertificateValidationCallback = ValidateServerCertificate,
-			TargetHost = parameters.DistinguishedName,
-		};
-	}
-	
-	internal async Task<Connection> EstablishNewConnectionWithRetry(CancellationToken cancellationToken) {
-		TimeSpan nextAttemptDelay = InitialRetryDelay;
-		
-		while (true) {
-			Connection? newConnection;
-			try {
-				newConnection = await EstablishNewConnection(cancellationToken);
-			} catch (Exception e) {
-				logger.Error(e, "Caught unhandled exception while connecting.");
-				newConnection = null;
-			}
-			
-			if (newConnection != null) {
-				return newConnection;
-			}
-			
-			logger.Warning("Failed to connect to server, trying again in {}.", nextAttemptDelay.TotalSeconds.ToString("F1"));
-			
-			await Task.Delay(nextAttemptDelay, cancellationToken);
-			nextAttemptDelay = Comparables.Min(nextAttemptDelay.Multiply(1.5), MaximumRetryDelay);
-		}
-	}
-	
-	internal async Task<Connection?> EstablishNewConnection(CancellationToken cancellationToken) {
-		logger.Information("Connecting to {Host}:{Port}...", parameters.Host, parameters.Port);
-		
-		Socket clientSocket = new Socket(SocketType.Stream, ProtocolType.Tcp);
-		try {
-			await clientSocket.ConnectAsync(parameters.Host, parameters.Port, cancellationToken);
-		} catch (Exception e) {
-			logger.Error(e, "Could not connect.");
-			throw;
-		}
-		
-		SslStream? stream;
-		try {
-			stream = new SslStream(new NetworkStream(clientSocket, ownsSocket: false), leaveInnerStreamOpen: false);
-			
-			if (await FinalizeConnection(stream, cancellationToken)) {
-				logger.Information("Connected to {Host}:{Port}.", parameters.Host, parameters.Port);
-				return new Connection(clientSocket, stream);
-			}
-		} catch (Exception e) {
-			logger.Error(e, "Caught unhandled exception.");
-			stream = null;
-		}
-		
-		try {
-			await DisconnectSocket(clientSocket, stream);
-		} finally {
-			clientSocket.Close();
-		}
-		
-		return null;
-	}
-	
-	private async Task<bool> FinalizeConnection(SslStream stream, CancellationToken cancellationToken) {
-		try {
-			loggedCertificateValidationError = false;
-			await stream.AuthenticateAsClientAsync(sslOptions, cancellationToken);
-		} catch (AuthenticationException e) {
-			if (!loggedCertificateValidationError) {
-				logger.Error(e, "Could not establish a secure connection.");
-			}
-			
-			return false;
-		}
-		
-		logger.Information("Established a secure connection.");
-		
-		try {
-			if (!await PerformApplicationHandshake(stream, cancellationToken)) {
-				return false;
-			}
-		} catch (EndOfStreamException) {
-			logger.Warning("Could not perform application handshake, connection lost.");
-		} catch (Exception e) {
-			logger.Warning(e, "Could not perform application handshake.");
-		}
-		
-		return true;
-	}
-	
-	private async Task<bool> PerformApplicationHandshake(Stream stream, CancellationToken cancellationToken) {
-		await Serialization.WriteAuthToken(parameters.AuthToken, stream, cancellationToken);
-		await Serialization.WriteGuid(sessionId, stream, cancellationToken);
-		
-		var result = (RpcHandshakeResult) await Serialization.ReadByte(stream, cancellationToken);
-		switch (result) {
-			case RpcHandshakeResult.Success:
-				return true;
-			
-			case RpcHandshakeResult.InvalidAuthToken:
-				logger.Error("Server rejected authorization token.");
-				return false;
-			
-			default:
-				logger.Error("Server rejected client due to unknown error: {ErrorId}", result);
-				return false;
-		}
-	}
-	
-	private bool ValidateServerCertificate(object sender, X509Certificate? certificate, X509Chain? chain, SslPolicyErrors sslPolicyErrors) {
-		if (certificate == null || sslPolicyErrors.HasFlag(SslPolicyErrors.RemoteCertificateNotAvailable)) {
-			logger.Error("Could not establish a secure connection, server did not provide a certificate.");
-		}
-		else if (sslPolicyErrors.HasFlag(SslPolicyErrors.RemoteCertificateNameMismatch)) {
-			logger.Error("Could not establish a secure connection, server certificate has the wrong name: {Name}", certificate.Subject);
-		}
-		else if (!parameters.CertificateThumbprint.Check(certificate)) {
-			logger.Error("Could not establish a secure connection, server certificate does not match.");
-		}
-		else if (TlsSupport.CheckAlgorithm((X509Certificate2) certificate) is {} error) {
-			logger.Error("Could not establish a secure connection, server certificate rejected because it uses {ActualAlgorithmName} instead of {ExpectedAlgorithmName}.", error.ActualAlgorithmName, error.ExpectedAlgorithmName);
-		}
-		else if ((sslPolicyErrors & ~SslPolicyErrors.RemoteCertificateChainErrors) != SslPolicyErrors.None) {
-			logger.Error("Could not establish a secure connection, server certificate validation failed.");
-		}
-		else {
-			return true;
-		}
-		
-		loggedCertificateValidationError = true;
-		return false;
-	}
-	
-	private static async Task DisconnectSocket(Socket socket, Stream? stream) {
-		if (stream != null) {
-			await stream.DisposeAsync();
-		}
-		
-		using CancellationTokenSource timeoutTokenSource = new CancellationTokenSource(DisconnectTimeout);
-		await socket.DisconnectAsync(reuseSocket: false, timeoutTokenSource.Token);
-	}
-	
-	internal sealed record Connection(Socket Socket, Stream Stream) : IDisposable {
-		public async Task Disconnect() {
-			await DisconnectSocket(Socket, Stream);
-		}
-		
-		public async ValueTask Shutdown() {
-			await Stream.DisposeAsync();
-			Socket.Shutdown(SocketShutdown.Both);
-		}
-		
-		public void Dispose() {
-			Stream.Dispose();
-			Socket.Close();
-		}
-	}
-}

Utils/Phantom.Utils.Rpc/Runtime/IRegistrationHandler.cs

@@ -0,0 +1,7 @@
+using Phantom.Utils.Actor;
+
+namespace Phantom.Utils.Rpc.Runtime;
+
+public interface IRegistrationHandler<TClientMessage, TServerMessage, TRegistrationMessage> where TRegistrationMessage : TServerMessage {
+	Task<Props<TServerMessage>?> TryRegister(RpcConnectionToClient<TClientMessage> connection, TRegistrationMessage message);
+}

Utils/Phantom.Utils.Rpc/Runtime/IRpcConnectionProvider.cs

@@ -1,5 +0,0 @@
-namespace Phantom.Utils.Rpc.Runtime;
-
-interface IRpcConnectionProvider {
-	Task<Stream> GetStream();
-}

Utils/Phantom.Utils.Rpc/Runtime/RpcClientConnectionClosedEventArgs.cs

@@ -0,0 +1,9 @@
+namespace Phantom.Utils.Rpc.Runtime;
+
+sealed class RpcClientConnectionClosedEventArgs : EventArgs {
+	internal uint RoutingId { get; }
+
+	internal RpcClientConnectionClosedEventArgs(uint routingId) {
+		RoutingId = routingId;
+	}
+}

Utils/Phantom.Utils.Rpc/Runtime/RpcClientRuntime.cs

@@ -0,0 +1,72 @@
+using NetMQ.Sockets;
+using Phantom.Utils.Actor;
+using Phantom.Utils.Rpc.Message;
+using Phantom.Utils.Rpc.Sockets;
+using Serilog;
+using Serilog.Events;
+
+namespace Phantom.Utils.Rpc.Runtime;
+
+public abstract class RpcClientRuntime<TClientMessage, TServerMessage, TReplyMessage> : RpcRuntime<ClientSocket> where TReplyMessage : TClientMessage, TServerMessage {
+	private readonly RpcConnectionToServer<TServerMessage> connection;
+	private readonly IMessageDefinitions<TClientMessage, TServerMessage, TReplyMessage> messageDefinitions;
+	private readonly ActorRef<TClientMessage> handlerActor;
+
+	private readonly SemaphoreSlim disconnectSemaphore;
+	private readonly CancellationToken receiveCancellationToken;
+
+	protected RpcClientRuntime(RpcClientSocket<TClientMessage, TServerMessage, TReplyMessage> socket, ActorRef<TClientMessage> handlerActor, SemaphoreSlim disconnectSemaphore, CancellationToken receiveCancellationToken) : base(socket) {
+		this.connection = socket.Connection;
+		this.messageDefinitions = socket.MessageDefinitions;
+		this.handlerActor = handlerActor;
+		this.disconnectSemaphore = disconnectSemaphore;
+		this.receiveCancellationToken = receiveCancellationToken;
+	}
+
+	private protected sealed override Task Run(ClientSocket socket) {
+		return RunWithConnection(socket, connection);
+	}
+
+	protected virtual async Task RunWithConnection(ClientSocket socket, RpcConnectionToServer<TServerMessage> connection) {
+		var replySender = new ReplySender<TServerMessage, TReplyMessage>(connection, messageDefinitions);
+		var messageHandler = new MessageHandler<TClientMessage>(LoggerName, handlerActor, replySender);
+
+		try {
+			while (!receiveCancellationToken.IsCancellationRequested) {
+				var data = socket.Receive(receiveCancellationToken);
+				
+				LogMessageType(RuntimeLogger, data);
+				
+				if (data.Length > 0) {
+					messageDefinitions.ToClient.Handle(data, messageHandler);
+				}
+			}
+		} catch (OperationCanceledException) {
+			// Ignore.
+		} finally {
+			await handlerActor.Stop();
+			RuntimeLogger.Debug("ZeroMQ client stopped receiving messages.");
+			
+			await disconnectSemaphore.WaitAsync(CancellationToken.None);
+		}
+	}
+
+	private protected sealed override async Task Disconnect(ClientSocket socket) {
+		await SendDisconnectMessage(socket, RuntimeLogger);
+	}
+	
+	protected abstract Task SendDisconnectMessage(ClientSocket socket, ILogger logger);
+
+	private void LogMessageType(ILogger logger, ReadOnlyMemory<byte> data) {
+		if (!logger.IsEnabled(LogEventLevel.Verbose)) {
+			return;
+		}
+
+		if (data.Length > 0 && messageDefinitions.ToClient.TryGetType(data, out var type)) {
+			logger.Verbose("Received {MessageType} ({Bytes} B).", type.Name, data.Length);
+		}
+		else {
+			logger.Verbose("Received {Bytes} B message.", data.Length);
+		}
+	}
+}

Utils/Phantom.Utils.Rpc/Runtime/RpcConnection.cs

@@ -0,0 +1,40 @@
+using Phantom.Utils.Actor;
+using Phantom.Utils.Rpc.Message;
+
+namespace Phantom.Utils.Rpc.Runtime; 
+
+public abstract class RpcConnection<TMessageBase> {
+	private readonly MessageRegistry<TMessageBase> messageRegistry;
+	private readonly MessageReplyTracker replyTracker;
+	
+	internal RpcConnection(MessageRegistry<TMessageBase> messageRegistry, MessageReplyTracker replyTracker) {
+		this.messageRegistry = messageRegistry;
+		this.replyTracker = replyTracker;
+	}
+
+	private protected abstract ValueTask Send(byte[] bytes);
+
+	public async Task Send<TMessage>(TMessage message) where TMessage : TMessageBase {
+		var bytes = messageRegistry.Write(message).ToArray();
+		if (bytes.Length > 0) {
+			await Send(bytes);
+		}
+	}
+
+	public async Task<TReply> Send<TMessage, TReply>(TMessage message, TimeSpan waitForReplyTime, CancellationToken waitForReplyCancellationToken) where TMessage : TMessageBase, ICanReply<TReply> {
+		var sequenceId = replyTracker.RegisterReply();
+		
+		var bytes = messageRegistry.Write<TMessage, TReply>(sequenceId, message).ToArray();
+		if (bytes.Length == 0) {
+			replyTracker.ForgetReply(sequenceId);
+			throw new ArgumentException("Could not write message.", nameof(message));
+		}
+
+		await Send(bytes);
+		return await replyTracker.WaitForReply<TReply>(sequenceId, waitForReplyTime, waitForReplyCancellationToken);
+	}
+
+	public void Receive(IReply message) {
+		replyTracker.ReceiveReply(message.SequenceId, message.SerializedReply);
+	}
+}

Utils/Phantom.Utils.Rpc/Runtime/RpcConnectionToClient.cs

@@ -0,0 +1,41 @@
+using NetMQ;
+using NetMQ.Sockets;
+using Phantom.Utils.Rpc.Message;
+
+namespace Phantom.Utils.Rpc.Runtime;
+
+public sealed class RpcConnectionToClient<TMessageBase> : RpcConnection<TMessageBase> {
+	private readonly ServerSocket socket;
+	private readonly uint routingId;
+
+	internal event EventHandler<RpcClientConnectionClosedEventArgs>? Closed;
+	private bool isClosed;
+
+	internal RpcConnectionToClient(ServerSocket socket, uint routingId, MessageRegistry<TMessageBase> messageRegistry, MessageReplyTracker replyTracker) : base(messageRegistry, replyTracker) {
+		this.socket = socket;
+		this.routingId = routingId;
+	}
+
+	public bool IsSame(RpcConnectionToClient<TMessageBase> other) {
+		return this.routingId == other.routingId && this.socket == other.socket;
+	}
+
+	public void Close() {
+		bool hasClosed = false;
+		
+		lock (this) {
+			if (!isClosed) {
+				isClosed = true;
+				hasClosed = true;
+			}
+		}
+
+		if (hasClosed) {
+			Closed?.Invoke(this, new RpcClientConnectionClosedEventArgs(routingId));
+		}
+	}
+
+	private protected override ValueTask Send(byte[] bytes) {
+		return socket.SendAsync(routingId, bytes);
+	}
+}

Utils/Phantom.Utils.Rpc/Runtime/RpcConnectionToServer.cs

@@ -0,0 +1,25 @@
+using NetMQ;
+using NetMQ.Sockets;
+using Phantom.Utils.Rpc.Message;
+using Phantom.Utils.Tasks;
+
+namespace Phantom.Utils.Rpc.Runtime;
+
+public sealed class RpcConnectionToServer<TMessageBase> : RpcConnection<TMessageBase> {
+	private readonly ClientSocket socket;
+	private readonly TaskCompletionSource isReady = AsyncTasks.CreateCompletionSource();
+
+	public Task IsReady => isReady.Task;
+	
+	internal RpcConnectionToServer(ClientSocket socket, MessageRegistry<TMessageBase> messageRegistry, MessageReplyTracker replyTracker) : base(messageRegistry, replyTracker) {
+		this.socket = socket;
+	}
+
+	public void SetIsReady() {
+		isReady.TrySetResult();
+	}
+
+	private protected override ValueTask Send(byte[] bytes) {
+		return socket.SendAsync(bytes);
+	}
+}

Utils/Phantom.Utils.Rpc/Runtime/RpcError.cs

@@ -1,9 +0,0 @@
-namespace Phantom.Utils.Rpc.Runtime;
-
-public enum RpcError : byte {
-	InvalidData = 0,
-	UnknownMessageRegistryCode = 1,
-	MessageDeserializationError = 2,
-	MessageHandlingError = 3,
-	MessageTooLarge = 4,
-}

Utils/Phantom.Utils.Rpc/Runtime/RpcErrorException.cs

@@ -1,20 +0,0 @@
-namespace Phantom.Utils.Rpc.Runtime;
-
-public sealed class RpcErrorException : Exception {
-	internal static RpcErrorException From(RpcError error) {
-		return error switch {
-			RpcError.InvalidData                 => new RpcErrorException("Invalid data", error),
-			RpcError.UnknownMessageRegistryCode  => new RpcErrorException("Unknown message registry code", error),
-			RpcError.MessageDeserializationError => new RpcErrorException("Message deserialization error", error),
-			RpcError.MessageHandlingError        => new RpcErrorException("Message handling error", error),
-			RpcError.MessageTooLarge             => new RpcErrorException("Message is too large", error),
-			_                                    => new RpcErrorException("Unknown error", error),
-		};
-	}
-	
-	public RpcError Error { get; }
-	
-	internal RpcErrorException(string message, RpcError error) : base(message) {
-		this.Error = error;
-	}
-}