WIP

.config/dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "dotnet-ef": {
-      "version": "8.0.3",
+      "version": "7.0.0-rc.1.22426.7",
       "commands": [
         "dotnet-ef"
       ]

.run/Controller + Web + Agent.run.xml

@@ -1,8 +0,0 @@
-<component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Controller + Web + Agent" type="CompoundRunConfigurationType">
-    <toRun name="Agent 1" type="DotNetProject" />
-    <toRun name="Controller" type="DotNetProject" />
-    <toRun name="Web" type="DotNetProject" />
-    <method v="2" />
-  </configuration>
-</component>

.run/Server + Agent x3.run.xml

@@ -1,10 +1,9 @@
 <component name="ProjectRunConfigurationManager">
-  <configuration default="false" name="Controller + Web + Agent x3" type="CompoundRunConfigurationType">
+  <configuration default="false" name="Server + Agent x3" type="CompoundRunConfigurationType">
     <toRun name="Agent 1" type="DotNetProject" />
     <toRun name="Agent 2" type="DotNetProject" />
     <toRun name="Agent 3" type="DotNetProject" />
-    <toRun name="Controller" type="DotNetProject" />
+    <toRun name="Server" type="DotNetProject" />
-    <toRun name="Web" type="DotNetProject" />
     <method v="2" />
   </configuration>
-</component>
+</component>

.run/Server + Agent.run.xml

@@ -0,0 +1,7 @@
+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Server + Agent" type="CompoundRunConfigurationType">
+    <toRun name="Agent 1" type="DotNetProject" />
+    <toRun name="Server" type="DotNetProject" />
+    <method v="2" />
+  </configuration>
+</component>

.run/Web.run.xml

@@ -6,8 +6,6 @@
     <option name="PASS_PARENT_ENVS" value="1" />
     <envs>
       <env name="ASPNETCORE_ENVIRONMENT" value="Development" />
-      <env name="CONTROLLER_HOST" value="localhost" />
-      <env name="WEB_KEY" value="BMNHM9RRPMCBBY29D9XHS6KBKZSRY7F5XFN27YZX96XXWJC2NM2D6YRHM9PZN9JGQGCSJ6FMB2GGZ" />
       <env name="WEB_SERVER_HOST" value="localhost" />
     </envs>
     <option name="USE_EXTERNAL_CONSOLE" value="0" />

Agent/Phantom.Agent.Minecraft/Command/MinecraftCommand.cs

@@ -1,4 +1,4 @@
-namespace Phantom.Agent.Minecraft.Command;
+namespace Phantom.Agent.Minecraft.Command; 
 
 public static class MinecraftCommand {
 	public const string SaveOn = "save-on";

Agent/Phantom.Agent.Minecraft/Instance/InstanceProcess.cs

@@ -1,8 +1,7 @@
 using Phantom.Utils.Collections;
 using Phantom.Utils.Processes;
-using Phantom.Utils.Tasks;
 
-namespace Phantom.Agent.Minecraft.Instance;
+namespace Phantom.Agent.Minecraft.Instance; 
 
 public sealed class InstanceProcess : IDisposable {
 	public InstanceProperties InstanceProperties { get; }
@@ -14,7 +13,6 @@ public sealed class InstanceProcess : IDisposable {
 	public bool HasEnded { get; private set; }
 
 	private readonly Process process;
-	private readonly TaskCompletionSource processExited = AsyncTasks.CreateCompletionSource();
 
 	internal InstanceProcess(InstanceProperties instanceProperties, Process process) {
 		this.InstanceProperties = instanceProperties;
@@ -48,15 +46,16 @@ public sealed class InstanceProcess : IDisposable {
 		OutputEvent = null;
 		HasEnded = true;
 		Ended?.Invoke(this, EventArgs.Empty);
-		processExited.SetResult();
 	}
 
 	public void Kill() {
 		process.Kill(true);
 	}
 
-	public async Task WaitForExit(TimeSpan timeout) {
+	public async Task WaitForExit(CancellationToken cancellationToken) {
-		await processExited.Task.WaitAsync(timeout);
+		if (!HasEnded) {
+			await process.WaitForExitAsync(cancellationToken);
+		}
 	}
 
 	public void Dispose() {

Agent/Phantom.Agent.Minecraft/Java/JavaRuntimeDiscovery.cs

@@ -1,7 +1,7 @@
 using System.Diagnostics;
 using Phantom.Common.Data.Java;
+using Phantom.Common.Logging;
 using Phantom.Utils.IO;
-using Phantom.Utils.Logging;
 using Serilog;
 
 namespace Phantom.Agent.Minecraft.Java;

Agent/Phantom.Agent.Minecraft/Java/JavaRuntimeExecutable.cs

@@ -1,6 +1,6 @@
 using Phantom.Common.Data.Java;
 
-namespace Phantom.Agent.Minecraft.Java;
+namespace Phantom.Agent.Minecraft.Java; 
 
 public sealed class JavaRuntimeExecutable {
 	internal string ExecutablePath { get; }

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

@@ -1,5 +1,4 @@
-using System.Collections.ObjectModel;
+using System.Text;
-using System.Text;
 using Phantom.Agent.Minecraft.Instance;
 using Phantom.Agent.Minecraft.Java;
 using Phantom.Agent.Minecraft.Server;
@@ -12,7 +11,6 @@ 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;
@@ -53,14 +51,16 @@ public abstract class BaseLauncher : IServerLauncher {
 		
 		var processConfigurator = new ProcessConfigurator {
 			FileName = javaRuntimeExecutable.ExecutablePath,
-			WorkingDirectory = InstanceFolder,
+			WorkingDirectory = instanceProperties.InstanceFolder,
 			RedirectInput = true,
 			UseShellExecute = false
 		};
 		
 		var processArguments = processConfigurator.ArgumentList;
 		PrepareJvmArguments(serverJar).Build(processArguments);
-		PrepareJavaProcessArguments(processArguments, serverJar.FilePath);
+		processArguments.Add("-jar");
+		processArguments.Add(serverJar.FilePath);
+		processArguments.Add("nogui");
 
 		var process = processConfigurator.CreateProcess();
 		var instanceProcess = new InstanceProcess(instanceProperties, process);
@@ -99,12 +99,6 @@ 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/LaunchServices.cs

@@ -1,6 +1,6 @@
 using Phantom.Agent.Minecraft.Java;
 using Phantom.Agent.Minecraft.Server;
 
-namespace Phantom.Agent.Minecraft.Launcher;
+namespace Phantom.Agent.Minecraft.Launcher; 
 
 public sealed record LaunchServices(MinecraftServerExecutables ServerExecutables, JavaRuntimeRepository JavaRuntimeRepository);

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

@@ -3,7 +3,7 @@ using Phantom.Agent.Minecraft.Instance;
 using Phantom.Utils.IO;
 using Serilog;
 
-namespace Phantom.Agent.Minecraft.Launcher.Types;
+namespace Phantom.Agent.Minecraft.Launcher.Types; 
 
 public sealed class FabricLauncher : BaseLauncher {
 	public FabricLauncher(InstanceProperties instanceProperties) : base(instanceProperties) {}

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

@@ -1,29 +0,0 @@
-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.Minecraft/Launcher/Types/InvalidLauncher.cs

@@ -1,7 +1,7 @@
 using Phantom.Agent.Minecraft.Server;
 using Serilog;
 
-namespace Phantom.Agent.Minecraft.Launcher.Types;
+namespace Phantom.Agent.Minecraft.Launcher.Types; 
 
 public sealed class InvalidLauncher : IServerLauncher {
 	public static InvalidLauncher Instance { get; } = new ();

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

@@ -1,6 +1,6 @@
 using Phantom.Agent.Minecraft.Instance;
 
-namespace Phantom.Agent.Minecraft.Launcher.Types;
+namespace Phantom.Agent.Minecraft.Launcher.Types; 
 
 public sealed class VanillaLauncher : BaseLauncher {
 	public VanillaLauncher(InstanceProperties instanceProperties) : base(instanceProperties) {}

Agent/Phantom.Agent.Minecraft/Phantom.Agent.Minecraft.csproj

@@ -11,8 +11,8 @@
   
   <ItemGroup>
     <ProjectReference Include="..\..\Common\Phantom.Common.Data\Phantom.Common.Data.csproj" />
+    <ProjectReference Include="..\..\Common\Phantom.Common.Logging\Phantom.Common.Logging.csproj" />
     <ProjectReference Include="..\..\Utils\Phantom.Utils\Phantom.Utils.csproj" />
-    <ProjectReference Include="..\..\Utils\Phantom.Utils.Logging\Phantom.Utils.Logging.csproj" />
   </ItemGroup>
 
 </Project>

Agent/Phantom.Agent.Minecraft/Properties/MinecraftServerProperties.cs

@@ -18,5 +18,4 @@ static class MinecraftServerProperties {
 	public static readonly MinecraftServerProperty<ushort> ServerPort = new UnsignedShort("server-port");
 	public static readonly MinecraftServerProperty<ushort> RconPort = new UnsignedShort("rcon.port");
 	public static readonly MinecraftServerProperty<bool> EnableRcon = new Boolean("enable-rcon");
-	public static readonly MinecraftServerProperty<bool> SyncChunkWrites = new Boolean("sync-chunk-writes");
 }

Agent/Phantom.Agent.Minecraft/Properties/MinecraftServerProperty.cs

@@ -1,6 +1,6 @@
 using Phantom.Agent.Minecraft.Java;
 
-namespace Phantom.Agent.Minecraft.Properties;
+namespace Phantom.Agent.Minecraft.Properties; 
 
 abstract class MinecraftServerProperty<T> {
 	private readonly string key;

Agent/Phantom.Agent.Minecraft/Properties/ServerProperties.cs

@@ -5,13 +5,11 @@ namespace Phantom.Agent.Minecraft.Properties;
 public sealed record ServerProperties(
 	ushort ServerPort,
 	ushort RconPort,
-	bool EnableRcon = true,
+	bool EnableRcon = true
-	bool SyncChunkWrites = false
 ) {
 	internal void SetTo(JavaPropertiesFileEditor properties) {
 		MinecraftServerProperties.ServerPort.Set(properties, ServerPort);
 		MinecraftServerProperties.RconPort.Set(properties, RconPort);
 		MinecraftServerProperties.EnableRcon.Set(properties, EnableRcon);
-		MinecraftServerProperties.SyncChunkWrites.Set(properties, SyncChunkWrites);
 	}
 }

Agent/Phantom.Agent.Minecraft/Server/DownloadProgressEventArgs.cs

@@ -1,4 +1,4 @@
-namespace Phantom.Agent.Minecraft.Server;
+namespace Phantom.Agent.Minecraft.Server; 
 
 public sealed class DownloadProgressEventArgs : EventArgs {
 	public ulong DownloadedBytes { get; }

Agent/Phantom.Agent.Minecraft/Server/MinecraftServerExecutableDownloadListener.cs

@@ -1,3 +1,3 @@
-namespace Phantom.Agent.Minecraft.Server;
+namespace Phantom.Agent.Minecraft.Server; 
 
 sealed record MinecraftServerExecutableDownloadListener(EventHandler<DownloadProgressEventArgs> DownloadProgressEventHandler, CancellationToken CancellationToken);

Agent/Phantom.Agent.Minecraft/Server/MinecraftServerExecutableDownloader.cs

@@ -1,8 +1,8 @@
 using System.Security.Cryptography;
 using Phantom.Common.Data.Minecraft;
+using Phantom.Common.Logging;
 using Phantom.Utils.Cryptography;
 using Phantom.Utils.IO;
-using Phantom.Utils.Logging;
 using Phantom.Utils.Runtime;
 using Serilog;
 
@@ -16,47 +16,32 @@ sealed class MinecraftServerExecutableDownloader {
 	public event EventHandler? Completed;
 	
 	private readonly CancellationTokenSource cancellationTokenSource = new ();
-	
+	private int listeners = 0;
-	private readonly List<CancellationTokenRegistration> listenerCancellationRegistrations = new ();
-	private int listenerCount = 0;
 
 	public MinecraftServerExecutableDownloader(FileDownloadInfo fileDownloadInfo, string minecraftVersion, string filePath, MinecraftServerExecutableDownloadListener listener) {
 		Register(listener);
-		Task = DownloadAndGetPath(fileDownloadInfo, minecraftVersion, filePath, new DownloadProgressCallback(this), cancellationTokenSource.Token);
+		Task = DownloadAndGetPath(fileDownloadInfo, minecraftVersion, filePath);
 		Task.ContinueWith(OnCompleted, TaskScheduler.Default);
 	}
 
 	public void Register(MinecraftServerExecutableDownloadListener listener) {
-		int newListenerCount;
+		++listeners;
+		Logger.Debug("Registered download listener, current listener count: {Listeners}", listeners);
 		
-		lock (this) {
+		DownloadProgress += listener.DownloadProgressEventHandler;
-			newListenerCount = ++listenerCount;
+		listener.CancellationToken.Register(Unregister, listener);
-			
-			DownloadProgress += listener.DownloadProgressEventHandler;
-			listenerCancellationRegistrations.Add(listener.CancellationToken.Register(Unregister, listener));
-		}
-		
-		Logger.Debug("Registered download listener, current listener count: {Listeners}", newListenerCount);
 	}
 
 	private void Unregister(object? listenerObject) {
-		int newListenerCount;
+		MinecraftServerExecutableDownloadListener listener = (MinecraftServerExecutableDownloadListener) listenerObject!;
-		
+		DownloadProgress -= listener.DownloadProgressEventHandler;
-		lock (this) {
-			MinecraftServerExecutableDownloadListener listener = (MinecraftServerExecutableDownloadListener) listenerObject!;
-			DownloadProgress -= listener.DownloadProgressEventHandler;
 
-			newListenerCount = --listenerCount;
+		if (--listeners <= 0) {
-			if (newListenerCount <= 0) {
-				cancellationTokenSource.Cancel();
-			}
-		}
-		
-		if (newListenerCount <= 0) {
 			Logger.Debug("Unregistered last download listener, cancelling download.");
+			cancellationTokenSource.Cancel();
 		}
 		else {
-			Logger.Debug("Unregistered download listener, current listener count: {Listeners}", newListenerCount);
+			Logger.Debug("Unregistered download listener, current listener count: {Listeners}", listeners);
 		}
 	}
 
@@ -66,19 +51,9 @@ sealed class MinecraftServerExecutableDownloader {
 
 	private void OnCompleted(Task task) {
 		Logger.Debug("Download task completed.");
-
+		Completed?.Invoke(this, EventArgs.Empty);
-		lock (this) {
+		Completed = null;
-			Completed?.Invoke(this, EventArgs.Empty);
+		DownloadProgress = null;
-			Completed = null;
-			DownloadProgress = null;
-
-			foreach (var registration in listenerCancellationRegistrations) {
-				registration.Dispose();
-			}
-			
-			listenerCancellationRegistrations.Clear();
-			cancellationTokenSource.Dispose();
-		}
 	}
 
 	private sealed class DownloadProgressCallback {
@@ -93,14 +68,15 @@ sealed class MinecraftServerExecutableDownloader {
 		}
 	}
 
-	private static async Task<string?> DownloadAndGetPath(FileDownloadInfo fileDownloadInfo, string minecraftVersion, string filePath, DownloadProgressCallback progressCallback, CancellationToken cancellationToken) {
+	private async Task<string?> DownloadAndGetPath(FileDownloadInfo fileDownloadInfo, string minecraftVersion, string filePath) {
 		string tmpFilePath = filePath + ".tmp";
 
+		var cancellationToken = cancellationTokenSource.Token;
 		try {
 			Logger.Information("Downloading server version {Version} from: {Url} ({Size})", minecraftVersion, fileDownloadInfo.DownloadUrl, fileDownloadInfo.Size.ToHumanReadable(decimalPlaces: 1));
 			try {
 				using var http = new HttpClient();
-				await FetchServerExecutableFile(http, progressCallback, fileDownloadInfo, tmpFilePath, cancellationToken);
+				await FetchServerExecutableFile(http, new DownloadProgressCallback(this), fileDownloadInfo, tmpFilePath, cancellationToken);
 			} catch (Exception) {
 				TryDeleteExecutableAfterFailure(tmpFilePath);
 				throw;
@@ -118,6 +94,8 @@ sealed class MinecraftServerExecutableDownloader {
 		} catch (Exception e) {
 			Logger.Error(e, "An unexpected error occurred.");
 			return null;
+		} finally {
+			cancellationTokenSource.Dispose();
 		}
 	}
 

Agent/Phantom.Agent.Minecraft/Server/MinecraftServerExecutables.cs

@@ -1,7 +1,7 @@
 using System.Text.RegularExpressions;
 using Phantom.Common.Data.Minecraft;
+using Phantom.Common.Logging;
 using Phantom.Utils.IO;
-using Phantom.Utils.Logging;
 using Serilog;
 
 namespace Phantom.Agent.Minecraft.Server;

Agent/Phantom.Agent.Minecraft/Server/ServerStatusProtocol.cs

@@ -3,12 +3,28 @@ using System.Buffers.Binary;
 using System.Net;
 using System.Net.Sockets;
 using System.Text;
-using Phantom.Common.Data.Instance;
+using Phantom.Common.Logging;
+using Serilog;
 
-namespace Phantom.Agent.Minecraft.Server;
+namespace Phantom.Agent.Minecraft.Server; 
 
-public static class ServerStatusProtocol {
+public sealed class ServerStatusProtocol {
-	public static async Task<InstancePlayerCounts> GetPlayerCounts(ushort serverPort, CancellationToken cancellationToken) {
+	private readonly ILogger logger;
+
+	public ServerStatusProtocol(string loggerName) {
+		this.logger = PhantomLogger.Create<ServerStatusProtocol>(loggerName);
+	}
+
+	public async Task<int?> GetOnlinePlayerCount(int serverPort, CancellationToken cancellationToken) {
+		try {
+			return await GetOnlinePlayerCountOrThrow(serverPort, cancellationToken);
+		} catch (Exception e) {
+			logger.Error(e, "Caught exception while checking if players are online.");
+			return null;
+		}
+	}
+
+	private async Task<int?> GetOnlinePlayerCountOrThrow(int serverPort, CancellationToken cancellationToken) {
 		using var tcpClient = new TcpClient();
 		await tcpClient.ConnectAsync(IPAddress.Loopback, serverPort, cancellationToken);
 		var tcpStream = tcpClient.GetStream();
@@ -17,22 +33,24 @@ public static class ServerStatusProtocol {
 		tcpStream.WriteByte(0xFE);
 		await tcpStream.FlushAsync(cancellationToken);
 
-		short messageLength = await ReadStreamHeader(tcpStream, cancellationToken);
+		short? messageLength = await ReadStreamHeader(tcpStream, cancellationToken);
-		return await ReadPlayerCounts(tcpStream, messageLength * 2, cancellationToken);
+		return messageLength == null ? null : await ReadOnlinePlayerCount(tcpStream, messageLength.Value * 2, cancellationToken);
 	}
 
-	private static async Task<short> ReadStreamHeader(NetworkStream tcpStream, CancellationToken cancellationToken) {
+	private async Task<short?> ReadStreamHeader(NetworkStream tcpStream, CancellationToken cancellationToken) {
 		var headerBuffer = ArrayPool<byte>.Shared.Rent(3);
 		try {
 			await tcpStream.ReadExactlyAsync(headerBuffer, 0, 3, cancellationToken);
 
 			if (headerBuffer[0] != 0xFF) {
-				throw new ProtocolException("Unexpected first byte in response from server: " + headerBuffer[0]);
+				logger.Error("Unexpected first byte in response from server: {FirstByte}.", headerBuffer[0]);
+				return null;
 			}
 
 			short messageLength = BinaryPrimitives.ReadInt16BigEndian(headerBuffer.AsSpan(1));
 			if (messageLength <= 0) {
-				throw new ProtocolException("Unexpected message length in response from server: " + messageLength);
+				logger.Error("Unexpected message length in response from server: {MessageLength}.", messageLength);
+				return null;
 			}
 			
 			return messageLength;
@@ -41,54 +59,35 @@ public static class ServerStatusProtocol {
 		}
 	}
 
-	private static async Task<InstancePlayerCounts> ReadPlayerCounts(NetworkStream tcpStream, int messageLength, CancellationToken cancellationToken) {
+	private async Task<int?> ReadOnlinePlayerCount(NetworkStream tcpStream, int messageLength, CancellationToken cancellationToken) {
 		var messageBuffer = ArrayPool<byte>.Shared.Rent(messageLength);
 		try {
 			await tcpStream.ReadExactlyAsync(messageBuffer, 0, messageLength, cancellationToken);
-			return ReadPlayerCountsFromResponse(messageBuffer.AsSpan(0, messageLength));
+
+			// Valid response separator encoded in UTF-16BE is 0x00 0xA7 (§).
+			const byte SeparatorSecondByte = 0xA7;
+			
+			static bool IsValidSeparator(ReadOnlySpan<byte> buffer, int index) {
+				return index > 0 && buffer[index - 1] == 0x00;
+			}
+			
+			int separator2 = Array.LastIndexOf(messageBuffer, SeparatorSecondByte);
+			int separator1 = separator2 == -1 ? -1 : Array.LastIndexOf(messageBuffer, SeparatorSecondByte, separator2 - 1);
+			if (!IsValidSeparator(messageBuffer, separator1) || !IsValidSeparator(messageBuffer, separator2)) {
+				logger.Error("Could not find message separators in response from server.");
+				return null;
+			}
+
+			string onlinePlayerCountStr = Encoding.BigEndianUnicode.GetString(messageBuffer.AsSpan((separator1 + 1)..(separator2 - 1)));
+			if (!int.TryParse(onlinePlayerCountStr, out int onlinePlayerCount)) {
+				logger.Error("Could not parse online player count in response from server: {OnlinePlayerCount}.", onlinePlayerCountStr);
+				return null;
+			}
+			
+			logger.Debug("Detected {OnlinePlayerCount} online player(s).", onlinePlayerCount);
+			return onlinePlayerCount;
 		} finally {
 			ArrayPool<byte>.Shared.Return(messageBuffer);
 		}
 	}
-	
-	/// <summary>
-	/// Legacy query protocol uses the paragraph symbol (§) as separator encoded in UTF-16BE.
-	/// </summary>
-	private static readonly byte[] Separator = { 0x00, 0xA7 };
-	
-	private static InstancePlayerCounts ReadPlayerCountsFromResponse(ReadOnlySpan<byte> messageBuffer) {
-		int lastSeparator = messageBuffer.LastIndexOf(Separator);
-		int middleSeparator = messageBuffer[..lastSeparator].LastIndexOf(Separator);
-		
-		if (lastSeparator == -1 || middleSeparator == -1) {
-			throw new ProtocolException("Could not find message separators in response from server.");
-		}
-
-		var onlinePlayerCountBuffer = messageBuffer[(middleSeparator + Separator.Length)..lastSeparator];
-		var maximumPlayerCountBuffer = messageBuffer[(lastSeparator + Separator.Length)..];
-		
-		// Player counts are integers, whose maximum string length is 10 characters.
-		Span<char> integerStringBuffer = stackalloc char[10];
-		
-		return new InstancePlayerCounts(
-			DecodeAndParsePlayerCount(onlinePlayerCountBuffer, integerStringBuffer, "online"),
-			DecodeAndParsePlayerCount(maximumPlayerCountBuffer, integerStringBuffer, "maximum")
-		);
-	}
-	
-	private static int DecodeAndParsePlayerCount(ReadOnlySpan<byte> inputBuffer, Span<char> tempCharBuffer, string countType) {
-		if (!Encoding.BigEndianUnicode.TryGetChars(inputBuffer, tempCharBuffer, out int charCount)) {
-			throw new ProtocolException("Could not decode " + countType + " player count in response from server.");
-		}
-		
-		if (!int.TryParse(tempCharBuffer, out int playerCount)) {
-			throw new ProtocolException("Could not parse " + countType + " player count in response from server: " + tempCharBuffer[..charCount].ToString());
-		}
-		
-		return playerCount;
-	}
-	
-	public sealed class ProtocolException : Exception {
-		internal ProtocolException(string message) : base(message) {}
-	}
 }

Agent/Phantom.Agent.Rpc/ControllerConnection.cs

@@ -1,21 +0,0 @@
-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

@@ -1,7 +1,7 @@
-using Phantom.Common.Messages.Agent;
+using Phantom.Common.Logging;
+using Phantom.Common.Messages.Agent;
 using Phantom.Common.Messages.Agent.ToController;
-using Phantom.Utils.Logging;
+using Phantom.Utils.Rpc;
-using Phantom.Utils.Rpc.Runtime;
 using Serilog;
 
 namespace Phantom.Agent.Rpc;
@@ -11,24 +11,22 @@ sealed class KeepAliveLoop {
 
 	private static readonly TimeSpan KeepAliveInterval = TimeSpan.FromSeconds(10);
 
-	private readonly RpcConnectionToServer<IMessageToController> connection;
+	private readonly RpcConnectionToServer<IMessageToControllerListener> connection;
 	private readonly CancellationTokenSource cancellationTokenSource = new ();
 
-	public KeepAliveLoop(RpcConnectionToServer<IMessageToController> connection) {
+	public KeepAliveLoop(RpcConnectionToServer<IMessageToControllerListener> connection) {
 		this.connection = connection;
 		Task.Run(Run);
 	}
 
 	private async Task Run() {
 		var cancellationToken = cancellationTokenSource.Token;
-		
+
+		Logger.Information("Started keep-alive loop.");
 		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);
+				await connection.Send(new AgentIsAliveMessage());
 			}
 		} catch (OperationCanceledException) {
 			// Ignore.

Agent/Phantom.Agent.Rpc/RpcClientRuntime.cs

@@ -1,37 +0,0 @@
-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.Rpc/RpcLauncher.cs

@@ -0,0 +1,107 @@
+using NetMQ;
+using NetMQ.Sockets;
+using Phantom.Common.Data.Agent;
+using Phantom.Common.Messages.Agent;
+using Phantom.Common.Messages.Agent.BiDirectional;
+using Phantom.Common.Messages.Agent.ToController;
+using Phantom.Utils.Rpc;
+using Phantom.Utils.Rpc.Message;
+using Phantom.Utils.Tasks;
+using Serilog;
+using Serilog.Events;
+
+namespace Phantom.Agent.Rpc;
+
+public sealed class RpcLauncher : RpcRuntime<ClientSocket> {
+	public static Task Launch(RpcConfiguration config, AuthToken authToken, AgentInfo agentInfo, Func<RpcConnectionToServer<IMessageToControllerListener>, IMessageToAgentListener> listenerFactory, SemaphoreSlim disconnectSemaphore, CancellationToken receiveCancellationToken) {
+		var socket = new ClientSocket();
+		var options = socket.Options;
+
+		options.CurveServerCertificate = config.ServerCertificate;
+		options.CurveCertificate = new NetMQCertificate();
+		options.HelloMessage = AgentMessageRegistries.ToController.Write(new RegisterAgentMessage(authToken, agentInfo)).ToArray();
+
+		return new RpcLauncher(config, socket, agentInfo.Guid, listenerFactory, disconnectSemaphore, receiveCancellationToken).Launch();
+	}
+
+	private readonly RpcConfiguration config;
+	private readonly Guid agentGuid;
+	private readonly Func<RpcConnectionToServer<IMessageToControllerListener>, IMessageToAgentListener> messageListenerFactory;
+
+	private readonly SemaphoreSlim disconnectSemaphore;
+	private readonly CancellationToken receiveCancellationToken;
+
+	private RpcLauncher(RpcConfiguration config, ClientSocket socket, Guid agentGuid, Func<RpcConnectionToServer<IMessageToControllerListener>, IMessageToAgentListener> messageListenerFactory, SemaphoreSlim disconnectSemaphore, CancellationToken receiveCancellationToken) : base(config, socket) {
+		this.config = config;
+		this.agentGuid = agentGuid;
+		this.messageListenerFactory = messageListenerFactory;
+		this.disconnectSemaphore = disconnectSemaphore;
+		this.receiveCancellationToken = receiveCancellationToken;
+	}
+
+	protected override void Connect(ClientSocket socket) {
+		var logger = config.RuntimeLogger;
+		var url = config.TcpUrl;
+
+		logger.Information("Starting ZeroMQ client and connecting to {Url}...", url);
+		socket.Connect(url);
+		logger.Information("ZeroMQ client ready.");
+	}
+
+	protected override void Run(ClientSocket socket, MessageReplyTracker replyTracker, TaskManager taskManager) {
+		var connection = new RpcConnectionToServer<IMessageToControllerListener>(socket, AgentMessageRegistries.ToController, replyTracker);
+		ServerMessaging.SetCurrentConnection(connection);
+		
+		var logger = config.RuntimeLogger;
+		var handler = new MessageToAgentHandler(messageListenerFactory(connection), logger, taskManager, receiveCancellationToken);
+		var keepAliveLoop = new KeepAliveLoop(connection);
+
+		try {
+			while (!receiveCancellationToken.IsCancellationRequested) {
+				var data = socket.Receive(receiveCancellationToken);
+				
+				LogMessageType(logger, data);
+				
+				if (data.Length > 0) {
+					AgentMessageRegistries.ToAgent.Handle(data, handler);
+				}
+			}
+		} catch (OperationCanceledException) {
+			// Ignore.
+		} finally {
+			logger.Debug("ZeroMQ client stopped receiving messages.");
+
+			disconnectSemaphore.Wait(CancellationToken.None);
+			keepAliveLoop.Cancel();
+		}
+	}
+
+	private static void LogMessageType(ILogger logger, ReadOnlyMemory<byte> data) {
+		if (!logger.IsEnabled(LogEventLevel.Verbose)) {
+			return;
+		}
+
+		if (data.Length > 0 && AgentMessageRegistries.ToAgent.TryGetType(data, out var type)) {
+			logger.Verbose("Received {MessageType} ({Bytes} B) from controller.", type.Name, data.Length);
+		}
+		else {
+			logger.Verbose("Received {Bytes} B message from controller.", data.Length);
+		}
+	}
+
+	protected override async Task Disconnect() {
+		var unregisterTimeoutTask = Task.Delay(TimeSpan.FromSeconds(5), CancellationToken.None);
+		var finishedTask = await Task.WhenAny(ServerMessaging.Send(new UnregisterAgentMessage(agentGuid)), unregisterTimeoutTask);
+		if (finishedTask == unregisterTimeoutTask) {
+			config.RuntimeLogger.Error("Timed out communicating agent shutdown with the controller.");
+		}
+	}
+
+	private sealed class MessageToAgentHandler : MessageHandler<IMessageToAgentListener> {
+		public MessageToAgentHandler(IMessageToAgentListener listener, ILogger logger, TaskManager taskManager, CancellationToken cancellationToken) : base(listener, logger, taskManager, cancellationToken) {}
+		
+		protected override Task SendReply(uint sequenceId, byte[] serializedReply) {
+			return ServerMessaging.Send(new ReplyMessage(sequenceId, serializedReply));
+		}
+	}
+}

Agent/Phantom.Agent.Rpc/ServerMessaging.cs

@@ -0,0 +1,35 @@
+using Phantom.Common.Logging;
+using Phantom.Common.Messages.Agent;
+using Phantom.Utils.Rpc;
+using Serilog;
+
+namespace Phantom.Agent.Rpc;
+
+public static class ServerMessaging {
+	private static readonly ILogger Logger = PhantomLogger.Create(nameof(ServerMessaging));
+	
+	private static RpcConnectionToServer<IMessageToControllerListener>? CurrentConnection { get; set; }
+	private static RpcConnectionToServer<IMessageToControllerListener> CurrentConnectionOrThrow => CurrentConnection ?? throw new InvalidOperationException("Server connection not ready.");
+	
+	private static readonly object SetCurrentConnectionLock = new ();
+
+	internal static void SetCurrentConnection(RpcConnectionToServer<IMessageToControllerListener> connection) {
+		lock (SetCurrentConnectionLock) {
+			if (CurrentConnection != null) {
+				throw new InvalidOperationException("Server connection can only be set once.");
+			}
+			
+			CurrentConnection = connection;
+		}
+		
+		Logger.Information("Server connection ready.");
+	}
+
+	public static Task Send<TMessage>(TMessage message) where TMessage : IMessageToController {
+		return CurrentConnectionOrThrow.Send(message);
+	}
+
+	public static Task<TReply?> Send<TMessage, TReply>(TMessage message, TimeSpan waitForReplyTime, CancellationToken waitForReplyCancellationToken) where TMessage : IMessageToController<TReply> where TReply : class {
+		return CurrentConnectionOrThrow.Send<TMessage, TReply>(message, waitForReplyTime, waitForReplyCancellationToken);
+	}
+}

Agent/Phantom.Agent.Services/AgentFolders.cs

@@ -1,5 +1,5 @@
-using Phantom.Utils.IO;
+using Phantom.Common.Logging;
-using Phantom.Utils.Logging;
+using Phantom.Utils.IO;
 using Serilog;
 
 namespace Phantom.Agent.Services;

Agent/Phantom.Agent.Services/AgentServiceConfiguration.cs

@@ -1,3 +1,3 @@
-namespace Phantom.Agent.Services;
+namespace Phantom.Agent.Services; 
 
 public readonly record struct AgentServiceConfiguration(int MaxConcurrentCompressionTasks);

Agent/Phantom.Agent.Services/AgentServices.cs

@@ -1,11 +1,9 @@
-using Akka.Actor;
+using Phantom.Agent.Minecraft.Java;
-using Phantom.Agent.Minecraft.Java;
-using Phantom.Agent.Rpc;
 using Phantom.Agent.Services.Backups;
 using Phantom.Agent.Services.Instances;
 using Phantom.Common.Data.Agent;
-using Phantom.Utils.Actor;
+using Phantom.Common.Logging;
-using Phantom.Utils.Logging;
+using Phantom.Utils.Tasks;
 using Serilog;
 
 namespace Phantom.Agent.Services;
@@ -13,28 +11,19 @@ namespace Phantom.Agent.Services;
 public sealed class AgentServices {
 	private static readonly ILogger Logger = PhantomLogger.Create<AgentServices>();
 	
-	public ActorSystem ActorSystem { get; }
-
 	private AgentFolders AgentFolders { get; }
-	private AgentState AgentState { get; }
+	private TaskManager TaskManager { get; }
 	private BackupManager BackupManager { get; }
 
 	internal JavaRuntimeRepository JavaRuntimeRepository { get; }
-	internal InstanceTicketManager InstanceTicketManager { get; }
+	internal InstanceSessionManager InstanceSessionManager { get; }
-	internal ActorRef<InstanceManagerActor.ICommand> InstanceManager { get; }
 
-	public AgentServices(AgentInfo agentInfo, AgentFolders agentFolders, AgentServiceConfiguration serviceConfiguration, ControllerConnection controllerConnection) {
+	public AgentServices(AgentInfo agentInfo, AgentFolders agentFolders, AgentServiceConfiguration serviceConfiguration) {
-		this.ActorSystem = ActorSystemFactory.Create("Agent");
-		
 		this.AgentFolders = agentFolders;
-		this.AgentState = new AgentState();
+		this.TaskManager = new TaskManager(PhantomLogger.Create<TaskManager, AgentServices>());
 		this.BackupManager = new BackupManager(agentFolders, serviceConfiguration.MaxConcurrentCompressionTasks);
-		
 		this.JavaRuntimeRepository = new JavaRuntimeRepository();
-		this.InstanceTicketManager = new InstanceTicketManager(agentInfo, controllerConnection);
+		this.InstanceSessionManager = new InstanceSessionManager(agentInfo, agentFolders, JavaRuntimeRepository, TaskManager, BackupManager);
-		
-		var instanceManagerInit = new InstanceManagerActor.Init(controllerConnection, agentFolders, AgentState, JavaRuntimeRepository, InstanceTicketManager, BackupManager);
-		this.InstanceManager = ActorSystem.ActorOf(InstanceManagerActor.Factory(instanceManagerInit), "InstanceManager");
 	}
 
 	public async Task Initialize() {
@@ -46,13 +35,11 @@ public sealed class AgentServices {
 	public async Task Shutdown() {
 		Logger.Information("Stopping services...");
 		
-		await InstanceManager.Stop(new InstanceManagerActor.ShutdownCommand());
+		await InstanceSessionManager.DisposeAsync();
+		await TaskManager.Stop();
 		
 		BackupManager.Dispose();
 		
-		await ActorSystem.Terminate();
-		ActorSystem.Dispose();
-		
 		Logger.Information("Services stopped.");
 	}
 }

Agent/Phantom.Agent.Services/AgentState.cs

@@ -1,15 +0,0 @@
-using System.Collections.Immutable;
-using Phantom.Agent.Services.Instances;
-using Phantom.Utils.Actor.Event;
-
-namespace Phantom.Agent.Services;
-
-sealed class AgentState {
-	private readonly ObservableState<ImmutableDictionary<Guid, Instance>> instancesByGuid = new (ImmutableDictionary<Guid, Instance>.Empty);
-	
-	public ImmutableDictionary<Guid, Instance> InstancesByGuid => instancesByGuid.State;
-	
-	public void UpdateInstance(Instance instance) {
-		instancesByGuid.PublisherSide.Publish(static (instancesByGuid, instance) => instancesByGuid.SetItem(instance.InstanceGuid, instance), instance);
-	}
-}

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

@@ -3,11 +3,11 @@ using System.Diagnostics.CodeAnalysis;
 using System.Formats.Tar;
 using Phantom.Agent.Minecraft.Instance;
 using Phantom.Common.Data.Backups;
+using Phantom.Common.Logging;
 using Phantom.Utils.IO;
-using Phantom.Utils.Logging;
 using Serilog;
 
-namespace Phantom.Agent.Services.Backups;
+namespace Phantom.Agent.Services.Backups; 
 
 sealed class BackupArchiver {
 	private readonly string destinationBasePath;
@@ -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 "servermods" or "versions"];
+		return relativePath is ["cache" or "crash-reports" or "debug" or "libraries" or "logs" or "mods" or "versions"];
 	}
 	
 	[SuppressMessage("ReSharper", "ConvertIfStatementToReturnStatement")]

Agent/Phantom.Agent.Services/Backups/BackupCompressor.cs

@@ -1,8 +1,8 @@
-using Phantom.Utils.Logging;
+using Phantom.Common.Logging;
 using Phantom.Utils.Processes;
 using Serilog;
 
-namespace Phantom.Agent.Services.Backups;
+namespace Phantom.Agent.Services.Backups; 
 
 static class BackupCompressor {
 	private static ILogger Logger { get; } = PhantomLogger.Create(nameof(BackupCompressor));

Agent/Phantom.Agent.Services/Backups/BackupManager.cs

@@ -1,6 +1,6 @@
 using Phantom.Agent.Minecraft.Instance;
 using Phantom.Common.Data.Backups;
-using Phantom.Utils.Logging;
+using Phantom.Common.Logging;
 using Serilog;
 
 namespace Phantom.Agent.Services.Backups;
@@ -67,10 +67,6 @@ sealed class BackupManager : IDisposable {
 				resultBuilder.Kind = BackupCreationResultKind.BackupCancelled;
 				logger.Warning("Backup creation was cancelled.");
 				return null;
-			} catch (TimeoutException) {
-				resultBuilder.Kind = BackupCreationResultKind.BackupTimedOut;
-				logger.Warning("Backup creation timed out.");
-				return null;
 			} catch (Exception e) {
 				resultBuilder.Kind = BackupCreationResultKind.UnknownError;
 				logger.Error(e, "Caught exception while creating an instance backup.");
@@ -80,9 +76,6 @@ sealed class BackupManager : IDisposable {
 					await dispatcher.EnableAutomaticSaving();
 				} catch (OperationCanceledException) {
 					// Ignore.
-				} catch (TimeoutException) {
-					resultBuilder.Warnings |= BackupCreationWarnings.CouldNotRestoreAutomaticSaving;
-					logger.Warning("Timed out waiting for automatic saving to be re-enabled.");
 				} catch (Exception e) {
 					resultBuilder.Warnings |= BackupCreationWarnings.CouldNotRestoreAutomaticSaving;
 					logger.Error(e, "Caught exception while enabling automatic saving after creating an instance backup.");
@@ -127,7 +120,6 @@ sealed class BackupManager : IDisposable {
 				BackupCreationResultKind.Success                            => "Backup created successfully.",
 				BackupCreationResultKind.InstanceNotRunning                 => "Instance is not running.",
 				BackupCreationResultKind.BackupCancelled                    => "Backup cancelled.",
-				BackupCreationResultKind.BackupTimedOut                     => "Backup timed out.",
 				BackupCreationResultKind.BackupAlreadyRunning               => "A backup is already being created.",
 				BackupCreationResultKind.BackupFileAlreadyExists            => "Backup with the same name already exists.",
 				BackupCreationResultKind.CouldNotCreateBackupFolder         => "Could not create backup folder.",

Agent/Phantom.Agent.Services/Backups/BackupScheduler.cs

@@ -1,8 +1,11 @@
-using Phantom.Agent.Services.Instances;
+using Phantom.Agent.Minecraft.Instance;
-using Phantom.Agent.Services.Instances.State;
+using Phantom.Agent.Minecraft.Server;
+using Phantom.Agent.Services.Instances;
+using Phantom.Agent.Services.Instances.Procedures;
 using Phantom.Common.Data.Backups;
-using Phantom.Utils.Logging;
+using Phantom.Common.Logging;
 using Phantom.Utils.Tasks;
+using Phantom.Utils.Threading;
 
 namespace Phantom.Agent.Services.Backups;
 
@@ -13,24 +16,28 @@ sealed class BackupScheduler : CancellableBackgroundTask {
 	private static readonly TimeSpan BackupFailureRetryDelay = TimeSpan.FromMinutes(5);
 
 	private readonly BackupManager backupManager;
-	private readonly InstanceContext context;
+	private readonly InstanceProcess process;
+	private readonly IInstanceContext context;
 	private readonly SemaphoreSlim backupSemaphore = new (1, 1);
+	private readonly int serverPort;
+	private readonly ServerStatusProtocol serverStatusProtocol;
 	private readonly ManualResetEventSlim serverOutputWhileWaitingForOnlinePlayers = new ();
-	private readonly InstancePlayerCountTracker playerCountTracker;
 	
-	public event EventHandler<BackupCreationResult>? BackupCompleted;
+	public event EventHandler<BackupCreationResult>? BackupCompleted; 
 
-	public BackupScheduler(InstanceContext context, InstancePlayerCountTracker playerCountTracker) : base(PhantomLogger.Create<BackupScheduler>(context.ShortName)) {
+	public BackupScheduler(TaskManager taskManager, BackupManager backupManager, InstanceProcess process, IInstanceContext context, int serverPort) : base(PhantomLogger.Create<BackupScheduler>(context.ShortName), taskManager, "Backup scheduler for " + context.ShortName) {
-		this.backupManager = context.Services.BackupManager;
+		this.backupManager = backupManager;
+		this.process = process;
 		this.context = context;
-		this.playerCountTracker = playerCountTracker;
+		this.serverPort = serverPort;
+		this.serverStatusProtocol = new ServerStatusProtocol(context.ShortName);
 		Start();
 	}
 
 	protected override async Task RunTask() {
 		await Task.Delay(InitialDelay, CancellationToken);
 		Logger.Information("Starting a new backup after server launched.");
-		
+			
 		while (!CancellationToken.IsCancellationRequested) {
 			var result = await CreateBackup();
 			BackupCompleted?.Invoke(this, result);
@@ -53,28 +60,52 @@ sealed class BackupScheduler : CancellableBackgroundTask {
 		}
 		
 		try {
-			context.ActorCancellationToken.ThrowIfCancellationRequested();
+			var procedure = new BackupInstanceProcedure(backupManager);
-			return await context.Actor.Request(new InstanceActor.BackupInstanceCommand(backupManager), context.ActorCancellationToken);
+			context.EnqueueProcedure(procedure);
-		} catch (OperationCanceledException) {
+			return await procedure.Result;
-			return new BackupCreationResult(BackupCreationResultKind.InstanceNotRunning);
 		} finally {
 			backupSemaphore.Release();
 		}
 	}
 
 	private async Task WaitForOnlinePlayers() {
-		var task = playerCountTracker.WaitForOnlinePlayers(CancellationToken);
+		bool needsToLogOfflinePlayersMessage = true;
-		if (!task.IsCompleted) {
-			Logger.Information("Waiting for someone to join before starting a new backup.");
-		}
 		
+		process.AddOutputListener(ServerOutputListener, maxLinesToReadFromHistory: 0);
 		try {
-			await task;
+			while (!CancellationToken.IsCancellationRequested) {
-			Logger.Information("Players are online, starting a new backup.");
+				serverOutputWhileWaitingForOnlinePlayers.Reset();
-		} catch (OperationCanceledException) {
+				
-			throw;
+				var onlinePlayerCount = await serverStatusProtocol.GetOnlinePlayerCount(serverPort, CancellationToken);
-		} catch (Exception) {
+				if (onlinePlayerCount == null) {
-			Logger.Warning("Could not detect whether any players are online, starting a new backup.");
+					Logger.Warning("Could not detect whether any players are online, starting a new backup.");
+					break;
+				}
+
+				if (onlinePlayerCount > 0) {
+					Logger.Information("Players are online, starting a new backup.");
+					break;
+				}
+
+				if (needsToLogOfflinePlayersMessage) {
+					needsToLogOfflinePlayersMessage = false;
+					Logger.Information("No players are online, waiting for someone to join before starting a new backup.");
+				}
+
+				await Task.Delay(TimeSpan.FromSeconds(10), CancellationToken);
+				
+				Logger.Debug("Waiting for server output before checking for online players again...");
+				await serverOutputWhileWaitingForOnlinePlayers.WaitHandle.WaitOneAsync(CancellationToken);
+			}
+		} finally {
+			process.RemoveOutputListener(ServerOutputListener);
+		}
+	}
+
+	private void ServerOutputListener(object? sender, string line) {
+		if (!serverOutputWhileWaitingForOnlinePlayers.IsSet) {
+			serverOutputWhileWaitingForOnlinePlayers.Set();
+			Logger.Debug("Detected server output, signalling to check for online players again.");
 		}
 	}
 

Agent/Phantom.Agent.Services/Backups/BackupServerCommandDispatcher.cs

@@ -1,5 +1,4 @@
-using System.Collections.Immutable;
+using System.Text.RegularExpressions;
-using System.Text.RegularExpressions;
 using Phantom.Agent.Minecraft.Command;
 using Phantom.Agent.Minecraft.Instance;
 using Phantom.Utils.Tasks;
@@ -8,26 +7,8 @@ using Serilog;
 namespace Phantom.Agent.Services.Backups;
 
 sealed partial class BackupServerCommandDispatcher : IDisposable {
-	[GeneratedRegex(@"^(?:(?:\[.*?\] \[Server thread/INFO\].*?:)|(?:[\d-]+? [\d:]+? \[INFO\])) (.*?)$", RegexOptions.NonBacktracking)]
+	[GeneratedRegex(@"^\[(?:.*?)\] \[Server thread/INFO\]: (.*?)$", RegexOptions.NonBacktracking)]
 	private static partial Regex ServerThreadInfoRegex();
-	
-	private static readonly ImmutableHashSet<string> AutomaticSavingDisabledMessages = ImmutableHashSet.Create(
-		"Automatic saving is now disabled",
-		"Turned off world auto-saving",
-		"CONSOLE: Disabling level saving.."
-	);
-	
-	private static readonly ImmutableHashSet<string> SavedTheGameMessages = ImmutableHashSet.Create(
-		"Saved the game",
-		"Saved the world",
-		"CONSOLE: Save complete."
-	);
-	
-	private static readonly ImmutableHashSet<string> AutomaticSavingEnabledMessages = ImmutableHashSet.Create(
-		"Automatic saving is now enabled",
-		"Turned on world auto-saving",
-		"CONSOLE: Enabling level saving.."
-	);
 
 	private readonly ILogger logger;
 	private readonly InstanceProcess process;
@@ -51,17 +32,18 @@ sealed partial class BackupServerCommandDispatcher : IDisposable {
 
 	public async Task DisableAutomaticSaving() {
 		await process.SendCommand(MinecraftCommand.SaveOff, cancellationToken);
-		await automaticSavingDisabled.Task.WaitAsync(TimeSpan.FromSeconds(30), cancellationToken);
+		await automaticSavingDisabled.Task.WaitAsync(cancellationToken);
 	}
 
 	public async Task SaveAllChunks() {
+		// TODO Try if not flushing and waiting a few seconds before flushing reduces lag.
 		await process.SendCommand(MinecraftCommand.SaveAll(flush: true), cancellationToken);
-		await savedTheGame.Task.WaitAsync(TimeSpan.FromMinutes(1), cancellationToken);
+		await savedTheGame.Task.WaitAsync(cancellationToken);
 	}
 
 	public async Task EnableAutomaticSaving() {
 		await process.SendCommand(MinecraftCommand.SaveOn, cancellationToken);
-		await automaticSavingEnabled.Task.WaitAsync(TimeSpan.FromMinutes(1), cancellationToken);
+		await automaticSavingEnabled.Task.WaitAsync(cancellationToken);
 	}
 
 	private void OnOutput(object? sender, string? line) {
@@ -77,19 +59,19 @@ sealed partial class BackupServerCommandDispatcher : IDisposable {
 		string info = match.Groups[1].Value;
 
 		if (!automaticSavingDisabled.Task.IsCompleted) {
-			if (AutomaticSavingDisabledMessages.Contains(info)) {
+			if (info == "Automatic saving is now disabled") {
 				logger.Debug("Detected that automatic saving is disabled.");
 				automaticSavingDisabled.SetResult();
 			}
 		}
 		else if (!savedTheGame.Task.IsCompleted) {
-			if (SavedTheGameMessages.Contains(info)) {
+			if (info == "Saved the game") {
 				logger.Debug("Detected that the game is saved.");
 				savedTheGame.SetResult();
 			}
 		}
 		else if (!automaticSavingEnabled.Task.IsCompleted) {
-			if (AutomaticSavingEnabledMessages.Contains(info)) {
+			if (info == "Automatic saving is now enabled") {
 				logger.Debug("Detected that automatic saving is enabled.");
 				automaticSavingEnabled.SetResult();
 			}

Agent/Phantom.Agent.Services/Instances/IInstanceContext.cs

@@ -0,0 +1,25 @@
+using Phantom.Agent.Services.Instances.Procedures;
+using Phantom.Agent.Services.Instances.States;
+using Phantom.Common.Data.Instance;
+using Serilog;
+
+namespace Phantom.Agent.Services.Instances; 
+
+interface IInstanceContext {
+	string ShortName { get; }
+	ILogger Logger { get; }
+	
+	InstanceServices Services { get; }
+	IInstanceState CurrentState { get; }
+
+	void SetStatus(IInstanceStatus newStatus);
+	void ReportEvent(IInstanceEvent instanceEvent);
+	void EnqueueProcedure(IInstanceProcedure procedure, bool immediate = false);
+}
+
+static class InstanceContextExtensions {
+	public static void SetLaunchFailedStatusAndReportEvent(this IInstanceContext context, InstanceLaunchFailReason reason) {
+		context.SetStatus(InstanceStatus.Failed(reason));
+		context.ReportEvent(new InstanceLaunchFailedEvent(reason));
+	}
+}

Agent/Phantom.Agent.Services/Instances/Instance.cs

@@ -1,5 +1,188 @@
-using Phantom.Common.Data.Instance;
+using Phantom.Agent.Minecraft.Launcher;
+using Phantom.Agent.Rpc;
+using Phantom.Agent.Services.Instances.Procedures;
+using Phantom.Agent.Services.Instances.States;
+using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Minecraft;
+using Phantom.Common.Data.Replies;
+using Phantom.Common.Logging;
+using Phantom.Common.Messages.Agent.ToController;
+using Serilog;
 
 namespace Phantom.Agent.Services.Instances;
 
-sealed record Instance(Guid InstanceGuid, IInstanceStatus Status);
+sealed class Instance : IAsyncDisposable {
+	private InstanceServices Services { get; }
+	
+	public InstanceConfiguration Configuration { get; private set; }
+	private IServerLauncher Launcher { get; set; }
+	private readonly SemaphoreSlim configurationSemaphore = new (1, 1);
+
+	private readonly string shortName;
+	private readonly ILogger logger;
+
+	private IInstanceStatus currentStatus;
+	private int statusUpdateCounter;
+	
+	private IInstanceState currentState;
+	public bool IsRunning => currentState is not InstanceNotRunningState;
+	
+	public event EventHandler? IsRunningChanged; 
+	
+	private readonly InstanceProcedureManager procedureManager;
+
+	public Instance(string shortName, InstanceServices services, InstanceConfiguration configuration, IServerLauncher launcher) {
+		this.shortName = shortName;
+		this.logger = PhantomLogger.Create<Instance>(shortName);
+
+		this.Services = services;
+		this.Configuration = configuration;
+		this.Launcher = launcher;
+		
+		this.currentState = new InstanceNotRunningState();
+		this.currentStatus = InstanceStatus.NotRunning;
+		
+		this.procedureManager = new InstanceProcedureManager(this, new Context(this), services.TaskManager);
+	}
+
+	private void TryUpdateStatus(string taskName, Func<Task> getUpdateTask) {
+		int myStatusUpdateCounter = Interlocked.Increment(ref statusUpdateCounter);
+		
+		Services.TaskManager.Run(taskName, async () => {
+			if (myStatusUpdateCounter == statusUpdateCounter) {
+				await getUpdateTask();
+			}
+		});
+	}
+
+	public void ReportLastStatus() {
+		TryUpdateStatus("Report last status of instance " + shortName, async () => {
+			await ServerMessaging.Send(new ReportInstanceStatusMessage(Configuration.InstanceGuid, currentStatus));
+		});
+	}
+
+	private void ReportAndSetStatus(IInstanceStatus status) {
+		TryUpdateStatus("Report status of instance " + shortName + " as " + status.GetType().Name, async () => {
+			if (status != currentStatus) {
+				currentStatus = status;
+				await ServerMessaging.Send(new ReportInstanceStatusMessage(Configuration.InstanceGuid, status));
+			}
+		});
+	}
+
+	private void ReportEvent(IInstanceEvent instanceEvent) {
+		var message = new ReportInstanceEventMessage(Guid.NewGuid(), DateTime.UtcNow, Configuration.InstanceGuid, instanceEvent);
+		Services.TaskManager.Run("Report event for instance " + shortName, async () => await ServerMessaging.Send(message));
+	}
+	
+	internal void TransitionState(IInstanceState newState) {
+		if (currentState == newState) {
+			return;
+		}
+
+		if (currentState is IDisposable disposable) {
+			disposable.Dispose();
+		}
+
+		logger.Debug("Transitioning instance state to: {NewState}", newState.GetType().Name);
+		
+		var wasRunning = IsRunning;
+		currentState = newState;
+		currentState.Initialize();
+
+		if (IsRunning != wasRunning) {
+			IsRunningChanged?.Invoke(this, EventArgs.Empty);
+		}
+	}
+
+	public async Task Reconfigure(InstanceConfiguration configuration, IServerLauncher launcher, CancellationToken cancellationToken) {
+		await configurationSemaphore.WaitAsync(cancellationToken);
+		try {
+			Configuration = configuration;
+			Launcher = launcher;
+		} finally {
+			configurationSemaphore.Release();
+		}
+	}
+
+	public async Task<LaunchInstanceResult> Launch(CancellationToken cancellationToken) {
+		if (IsRunning) {
+			return LaunchInstanceResult.InstanceAlreadyRunning;
+		}
+
+		if (await procedureManager.GetCurrentProcedure(cancellationToken) is LaunchInstanceProcedure) {
+			return LaunchInstanceResult.InstanceAlreadyLaunching;
+		}
+		
+		LaunchInstanceProcedure procedure;
+		
+		await configurationSemaphore.WaitAsync(cancellationToken);
+		try {
+			procedure = new LaunchInstanceProcedure(Configuration, Launcher);
+		} finally {
+			configurationSemaphore.Release();
+		}
+		
+		ReportAndSetStatus(InstanceStatus.Launching);
+		await procedureManager.Enqueue(procedure);
+		return LaunchInstanceResult.LaunchInitiated;
+	}
+
+	public async Task<StopInstanceResult> Stop(MinecraftStopStrategy stopStrategy, CancellationToken cancellationToken) {
+		if (!IsRunning) {
+			return StopInstanceResult.InstanceAlreadyStopped;
+		}
+		
+		if (await procedureManager.GetCurrentProcedure(cancellationToken) is StopInstanceProcedure) {
+			return StopInstanceResult.InstanceAlreadyStopping;
+		}
+		
+		ReportAndSetStatus(InstanceStatus.Stopping);
+		await procedureManager.Enqueue(new StopInstanceProcedure(stopStrategy));
+		return StopInstanceResult.StopInitiated;
+	}
+
+	public async Task<bool> SendCommand(string command, CancellationToken cancellationToken) {
+		return await currentState.SendCommand(command, cancellationToken);
+	}
+
+	public async ValueTask DisposeAsync() {
+		await procedureManager.DisposeAsync();
+
+		while (currentState is not InstanceNotRunningState) {
+			await Task.Delay(TimeSpan.FromMilliseconds(250), CancellationToken.None);
+		}
+
+		if (currentState is IDisposable disposable) {
+			disposable.Dispose();
+		}
+		
+		configurationSemaphore.Dispose();
+	}
+
+	private sealed class Context : IInstanceContext {
+		public string ShortName => instance.shortName;
+		public ILogger Logger => instance.logger;
+		
+		public InstanceServices Services => instance.Services;
+		public IInstanceState CurrentState => instance.currentState;
+
+		private readonly Instance instance;
+		
+		public Context(Instance instance) {
+			this.instance = instance;
+		}
+
+		public void SetStatus(IInstanceStatus newStatus) {
+			instance.ReportAndSetStatus(newStatus);
+		}
+
+		public void ReportEvent(IInstanceEvent instanceEvent) {
+			instance.ReportEvent(instanceEvent);
+		}
+
+		public void EnqueueProcedure(IInstanceProcedure procedure, bool immediate) {
+			Services.TaskManager.Run("Enqueue procedure for instance " + instance.shortName, () => instance.procedureManager.Enqueue(procedure, immediate));
+		}
+	}
+}

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

@@ -1,161 +0,0 @@
-using Phantom.Agent.Minecraft.Launcher;
-using Phantom.Agent.Services.Backups;
-using Phantom.Agent.Services.Instances.State;
-using Phantom.Common.Data.Backups;
-using Phantom.Common.Data.Instance;
-using Phantom.Common.Data.Minecraft;
-using Phantom.Common.Data.Replies;
-using Phantom.Common.Messages.Agent.ToController;
-using Phantom.Utils.Actor;
-using Phantom.Utils.Actor.Mailbox;
-using Phantom.Utils.Logging;
-
-namespace Phantom.Agent.Services.Instances;
-
-sealed class InstanceActor : ReceiveActor<InstanceActor.ICommand> {
-	public readonly record struct Init(AgentState AgentState, Guid InstanceGuid, string ShortName, InstanceServices InstanceServices, InstanceTicketManager InstanceTicketManager, CancellationToken ShutdownCancellationToken);
-
-	public static Props<ICommand> Factory(Init init) {
-		return Props<ICommand>.Create(() => new InstanceActor(init), new ActorConfiguration { SupervisorStrategy = SupervisorStrategies.Resume, MailboxType = UnboundedJumpAheadMailbox.Name });
-	}
-
-	private readonly AgentState agentState;
-	private readonly CancellationToken shutdownCancellationToken;
-	
-	private readonly Guid instanceGuid;
-	private readonly InstanceServices instanceServices;
-	private readonly InstanceTicketManager instanceTicketManager;
-	private readonly InstanceContext context;
-	
-	private readonly CancellationTokenSource actorCancellationTokenSource = new ();
-
-	private IInstanceStatus currentStatus = InstanceStatus.NotRunning;
-	private InstanceRunningState? runningState = null;
-
-	private InstanceActor(Init init) {
-		this.agentState = init.AgentState;
-		this.instanceGuid = init.InstanceGuid;
-		this.instanceServices = init.InstanceServices;
-		this.instanceTicketManager = init.InstanceTicketManager;
-		this.shutdownCancellationToken = init.ShutdownCancellationToken;
-		
-		var logger = PhantomLogger.Create<InstanceActor>(init.ShortName);
-		this.context = new InstanceContext(instanceGuid, init.ShortName, logger, instanceServices, SelfTyped, actorCancellationTokenSource.Token);
-
-		Receive<ReportInstanceStatusCommand>(ReportInstanceStatus);
-		ReceiveAsync<LaunchInstanceCommand>(LaunchInstance);
-		ReceiveAsync<StopInstanceCommand>(StopInstance);
-		ReceiveAsyncAndReply<SendCommandToInstanceCommand, SendCommandToInstanceResult>(SendCommandToInstance);
-		ReceiveAsyncAndReply<BackupInstanceCommand, BackupCreationResult>(BackupInstance);
-		Receive<HandleProcessEndedCommand>(HandleProcessEnded);
-		ReceiveAsync<ShutdownCommand>(Shutdown);
-	}
-
-	private void SetAndReportStatus(IInstanceStatus status) {
-		currentStatus = status;
-		ReportCurrentStatus();
-	}
-
-	private void ReportCurrentStatus() {
-		agentState.UpdateInstance(new Instance(instanceGuid, currentStatus));
-		instanceServices.ControllerConnection.Send(new ReportInstanceStatusMessage(instanceGuid, currentStatus));
-	}
-
-	private void TransitionState(InstanceRunningState? newState) {
-		if (runningState == newState) {
-			return;
-		}
-
-		runningState?.Dispose();
-		runningState = newState;
-		runningState?.Initialize();
-	}
-	
-	public interface ICommand {}
-
-	public sealed record ReportInstanceStatusCommand : ICommand;
-	
-	public sealed record LaunchInstanceCommand(InstanceConfiguration Configuration, IServerLauncher Launcher, InstanceTicketManager.Ticket Ticket, bool IsRestarting) : ICommand;
-	
-	public sealed record StopInstanceCommand(MinecraftStopStrategy StopStrategy) : ICommand;
-	
-	public sealed record SendCommandToInstanceCommand(string Command) : ICommand, ICanReply<SendCommandToInstanceResult>;
-	
-	public sealed record BackupInstanceCommand(BackupManager BackupManager) : ICommand, ICanReply<BackupCreationResult>;
-	
-	public sealed record HandleProcessEndedCommand(IInstanceStatus Status) : ICommand, IJumpAhead;
-	
-	public sealed record ShutdownCommand : ICommand;
-
-	private void ReportInstanceStatus(ReportInstanceStatusCommand command) {
-		ReportCurrentStatus();
-	}
-	
-	private async Task LaunchInstance(LaunchInstanceCommand command) {
-		if (command.IsRestarting || runningState is null) {
-			SetAndReportStatus(command.IsRestarting ? InstanceStatus.Restarting : InstanceStatus.Launching);
-			
-			var newState = await InstanceLaunchProcedure.Run(context, command.Configuration, command.Launcher, instanceTicketManager, command.Ticket, SetAndReportStatus, shutdownCancellationToken);
-			if (newState is null) {
-				instanceTicketManager.Release(command.Ticket);
-			}
-			
-			TransitionState(newState);
-		}
-	}
-
-	private async Task StopInstance(StopInstanceCommand command) {
-		if (runningState is null) {
-			return;
-		}
-
-		IInstanceStatus oldStatus = currentStatus;
-		SetAndReportStatus(InstanceStatus.Stopping);
-		
-		if (await InstanceStopProcedure.Run(context, command.StopStrategy, runningState, SetAndReportStatus, shutdownCancellationToken)) {
-			instanceTicketManager.Release(runningState.Ticket);
-			TransitionState(null);
-		}
-		else {
-			SetAndReportStatus(oldStatus);
-		}
-	}
-
-	private async Task<SendCommandToInstanceResult> SendCommandToInstance(SendCommandToInstanceCommand command) {
-		if (runningState is null) {
-			return SendCommandToInstanceResult.InstanceNotRunning;
-		}
-		else {
-			return await runningState.SendCommand(command.Command, shutdownCancellationToken);
-		}
-	}
-	
-	private async Task<BackupCreationResult> BackupInstance(BackupInstanceCommand command) {
-		if (runningState is null || runningState.Process.HasEnded) {
-			return new BackupCreationResult(BackupCreationResultKind.InstanceNotRunning);
-		}
-		else {
-			SetAndReportStatus(InstanceStatus.BackingUp);
-			try {
-				return await command.BackupManager.CreateBackup(context.ShortName, runningState.Process, shutdownCancellationToken);
-			} finally {
-				SetAndReportStatus(InstanceStatus.Running);
-			}
-		}
-	}
-
-	private void HandleProcessEnded(HandleProcessEndedCommand command) {
-		if (runningState is { Process.HasEnded: true }) {
-			SetAndReportStatus(command.Status);
-			context.ReportEvent(InstanceEvent.Stopped);
-			instanceTicketManager.Release(runningState.Ticket);
-			TransitionState(null);
-		}
-	}
-
-	private async Task Shutdown(ShutdownCommand command) {
-		await StopInstance(new StopInstanceCommand(MinecraftStopStrategy.Instant));
-		await actorCancellationTokenSource.CancelAsync();
-		Context.Stop(Self);
-	}
-}

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

@@ -1,12 +0,0 @@
-using Phantom.Common.Data.Instance;
-using Phantom.Common.Messages.Agent.ToController;
-using Phantom.Utils.Actor;
-using Serilog;
-
-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.Send(new ReportInstanceEventMessage(Guid.NewGuid(), DateTime.UtcNow, InstanceGuid, instanceEvent));
-	}
-}

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

@@ -1,14 +1,14 @@
 using System.Collections.Immutable;
 using System.Threading.Channels;
 using Phantom.Agent.Rpc;
+using Phantom.Common.Logging;
 using Phantom.Common.Messages.Agent.ToController;
-using Phantom.Utils.Logging;
 using Phantom.Utils.Tasks;
 
-namespace Phantom.Agent.Services.Instances.State;
+namespace Phantom.Agent.Services.Instances;
 
 sealed class InstanceLogSender : CancellableBackgroundTask {
-	private static readonly BoundedChannelOptions BufferOptions = new (capacity: 100) {
+	private static readonly BoundedChannelOptions BufferOptions = new (capacity: 64) {
 		SingleReader = true,
 		SingleWriter = true,
 		FullMode = BoundedChannelFullMode.DropNewest
@@ -16,14 +16,12 @@ sealed class InstanceLogSender : CancellableBackgroundTask {
 	
 	private static readonly TimeSpan SendDelay = TimeSpan.FromMilliseconds(200);
 
-	private readonly ControllerConnection controllerConnection;
 	private readonly Guid instanceGuid;
 	private readonly Channel<string> outputChannel;
 	
 	private int droppedLinesSinceLastSend;
 
-	public InstanceLogSender(ControllerConnection controllerConnection, Guid instanceGuid, string loggerName) : base(PhantomLogger.Create<InstanceLogSender>(loggerName)) {
+	public InstanceLogSender(TaskManager taskManager, Guid instanceGuid, string loggerName) : base(PhantomLogger.Create<InstanceLogSender>(loggerName), taskManager, "Instance log sender for " + loggerName) {
-		this.controllerConnection = controllerConnection;
 		this.instanceGuid = instanceGuid;
 		this.outputChannel = Channel.CreateBounded<string>(BufferOptions, OnLineDropped);
 		Start();
@@ -36,14 +34,14 @@ sealed class InstanceLogSender : CancellableBackgroundTask {
 		try {
 			while (await lineReader.WaitToReadAsync(CancellationToken)) {
 				await Task.Delay(SendDelay, CancellationToken);
-				SendOutputToServer(ReadLinesFromChannel(lineReader, lineBuilder));
+				await SendOutputToServer(ReadLinesFromChannel(lineReader, lineBuilder));
 			}
 		} catch (OperationCanceledException) {
 			// Ignore.
 		}
 
 		// Flush remaining lines.
-		SendOutputToServer(ReadLinesFromChannel(lineReader, lineBuilder));
+		await SendOutputToServer(ReadLinesFromChannel(lineReader, lineBuilder));
 	}
 
 	private ImmutableArray<string> ReadLinesFromChannel(ChannelReader<string> reader, ImmutableArray<string>.Builder builder) {
@@ -61,9 +59,9 @@ sealed class InstanceLogSender : CancellableBackgroundTask {
 		return builder.ToImmutable();
 	}
 
-	private void SendOutputToServer(ImmutableArray<string> lines) {
+	private async Task SendOutputToServer(ImmutableArray<string> lines) {
 		if (!lines.IsEmpty) {
-			controllerConnection.Send(new InstanceOutputMessage(instanceGuid, lines));
+			await ServerMessaging.Send(new InstanceOutputMessage(instanceGuid, lines));
 		}
 	}
 

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

@@ -1,209 +0,0 @@
-using Phantom.Agent.Minecraft.Instance;
-using Phantom.Agent.Minecraft.Java;
-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.Common.Data;
-using Phantom.Common.Data.Instance;
-using Phantom.Common.Data.Minecraft;
-using Phantom.Common.Data.Replies;
-using Phantom.Utils.Actor;
-using Phantom.Utils.IO;
-using Phantom.Utils.Logging;
-using Serilog;
-
-namespace Phantom.Agent.Services.Instances;
-
-sealed class InstanceManagerActor : ReceiveActor<InstanceManagerActor.ICommand> {
-	private static readonly ILogger Logger = PhantomLogger.Create<InstanceManagerActor>();
-
-	public readonly record struct Init(ControllerConnection ControllerConnection, AgentFolders AgentFolders, AgentState AgentState, JavaRuntimeRepository JavaRuntimeRepository, InstanceTicketManager InstanceTicketManager, BackupManager BackupManager);
-
-	public static Props<ICommand> Factory(Init init) {
-		return Props<ICommand>.Create(() => new InstanceManagerActor(init), new ActorConfiguration { SupervisorStrategy = SupervisorStrategies.Resume });
-	}
-	
-	private readonly AgentState agentState;
-	private readonly string basePath;
-
-	private readonly InstanceServices instanceServices;
-	private readonly InstanceTicketManager instanceTicketManager;
-	private readonly Dictionary<Guid, InstanceInfo> instances = new ();
-
-	private readonly CancellationTokenSource shutdownCancellationTokenSource = new ();
-	private readonly CancellationToken shutdownCancellationToken;
-
-	private uint instanceLoggerSequenceId = 0;
-
-	private InstanceManagerActor(Init init) {
-		this.agentState = init.AgentState;
-		this.basePath = init.AgentFolders.InstancesFolderPath;
-		this.instanceTicketManager = init.InstanceTicketManager;
-		this.shutdownCancellationToken = shutdownCancellationTokenSource.Token;
-
-		var minecraftServerExecutables = new MinecraftServerExecutables(init.AgentFolders.ServerExecutableFolderPath);
-		var launchServices = new LaunchServices(minecraftServerExecutables, init.JavaRuntimeRepository);
-
-		this.instanceServices = new InstanceServices(init.ControllerConnection, init.BackupManager, launchServices);
-		
-		ReceiveAndReply<ConfigureInstanceCommand, Result<ConfigureInstanceResult, InstanceActionFailure>>(ConfigureInstance);
-		ReceiveAndReply<LaunchInstanceCommand, Result<LaunchInstanceResult, InstanceActionFailure>>(LaunchInstance);
-		ReceiveAndReply<StopInstanceCommand, Result<StopInstanceResult, InstanceActionFailure>>(StopInstance);
-		ReceiveAsyncAndReply<SendCommandToInstanceCommand, Result<SendCommandToInstanceResult, InstanceActionFailure>>(SendCommandToInstance);
-		ReceiveAsync<ShutdownCommand>(Shutdown);
-	}
-
-	private string GetInstanceLoggerName(Guid guid) {
-		var prefix = guid.ToString();
-		return prefix[..prefix.IndexOf('-')] + "/" + Interlocked.Increment(ref instanceLoggerSequenceId);
-	}
-
-	private sealed record InstanceInfo(ActorRef<InstanceActor.ICommand> Actor, InstanceConfiguration Configuration, IServerLauncher Launcher);
-	
-	public interface ICommand {}
-	
-	public sealed record ConfigureInstanceCommand(Guid InstanceGuid, InstanceConfiguration Configuration, InstanceLaunchProperties LaunchProperties, bool LaunchNow, bool AlwaysReportStatus) : ICommand, ICanReply<Result<ConfigureInstanceResult, InstanceActionFailure>>;
-	
-	public sealed record LaunchInstanceCommand(Guid InstanceGuid) : ICommand, ICanReply<Result<LaunchInstanceResult, InstanceActionFailure>>;
-	
-	public sealed record StopInstanceCommand(Guid InstanceGuid, MinecraftStopStrategy StopStrategy) : ICommand, ICanReply<Result<StopInstanceResult, InstanceActionFailure>>;
-	
-	public sealed record SendCommandToInstanceCommand(Guid InstanceGuid, string Command) : ICommand, ICanReply<Result<SendCommandToInstanceResult, InstanceActionFailure>>;
-	
-	public sealed record ShutdownCommand : ICommand;
-
-	private Result<ConfigureInstanceResult, InstanceActionFailure> ConfigureInstance(ConfigureInstanceCommand command) {
-		var instanceGuid = command.InstanceGuid;
-		var configuration = command.Configuration;
-
-		var instanceFolder = Path.Combine(basePath, instanceGuid.ToString());
-		Directories.Create(instanceFolder, Chmod.URWX_GRX);
-
-		var heapMegabytes = configuration.MemoryAllocation.InMegabytes;
-		var jvmProperties = new JvmProperties(
-			InitialHeapMegabytes: heapMegabytes / 2,
-			MaximumHeapMegabytes: heapMegabytes
-		);
-
-		var properties = new InstanceProperties(
-			instanceGuid,
-			configuration.JavaRuntimeGuid,
-			jvmProperties,
-			configuration.JvmArguments,
-			instanceFolder,
-			configuration.MinecraftVersion,
-			new ServerProperties(configuration.ServerPort, configuration.RconPort),
-			command.LaunchProperties
-		);
-
-		IServerLauncher launcher = configuration.MinecraftServerKind switch {
-			MinecraftServerKind.Vanilla => new VanillaLauncher(properties),
-			MinecraftServerKind.Fabric  => new FabricLauncher(properties),
-			MinecraftServerKind.Forge   => new ForgeLauncher(properties),
-			_                           => InvalidLauncher.Instance
-		};
-
-		if (instances.TryGetValue(instanceGuid, out var instance)) {
-			instances[instanceGuid] = instance with {
-				Configuration = configuration,
-				Launcher = launcher
-			};
-				
-			Logger.Information("Reconfigured instance \"{Name}\" (GUID {Guid}).", configuration.InstanceName, instanceGuid);
-
-			if (command.AlwaysReportStatus) {
-				instance.Actor.Tell(new InstanceActor.ReportInstanceStatusCommand());
-			}
-		}
-		else {
-			var instanceInit = new InstanceActor.Init(agentState, instanceGuid, GetInstanceLoggerName(instanceGuid), instanceServices, instanceTicketManager, shutdownCancellationToken);
-			instances[instanceGuid] = instance = new InstanceInfo(Context.ActorOf(InstanceActor.Factory(instanceInit), "Instance-" + instanceGuid), configuration, launcher);
-				
-			Logger.Information("Created instance \"{Name}\" (GUID {Guid}).", configuration.InstanceName, instanceGuid);
-
-			instance.Actor.Tell(new InstanceActor.ReportInstanceStatusCommand());
-		}
-
-		if (command.LaunchNow) {
-			LaunchInstance(new LaunchInstanceCommand(instanceGuid));
-		}
-
-		return ConfigureInstanceResult.Success;
-	}
-
-	private Result<LaunchInstanceResult, InstanceActionFailure> LaunchInstance(LaunchInstanceCommand command) {
-		var instanceGuid = command.InstanceGuid;
-		if (!instances.TryGetValue(instanceGuid, out var instanceInfo)) {
-			return InstanceActionFailure.InstanceDoesNotExist;
-		}
-		
-		var ticket = instanceTicketManager.Reserve(instanceInfo.Configuration);
-		if (!ticket) {
-			return ticket.Error;
-		}
-
-		if (agentState.InstancesByGuid.TryGetValue(instanceGuid, out var instance)) {
-			var status = instance.Status;
-			if (status.IsRunning()) {
-				return LaunchInstanceResult.InstanceAlreadyRunning;
-			}
-			else if (status.IsLaunching()) {
-				return LaunchInstanceResult.InstanceAlreadyLaunching;
-			}
-		}
-		
-		instanceInfo.Actor.Tell(new InstanceActor.LaunchInstanceCommand(instanceInfo.Configuration, instanceInfo.Launcher, ticket.Value, IsRestarting: false));
-		return LaunchInstanceResult.LaunchInitiated;
-	}
-
-	private Result<StopInstanceResult, InstanceActionFailure> StopInstance(StopInstanceCommand command) {
-		var instanceGuid = command.InstanceGuid;
-		if (!instances.TryGetValue(instanceGuid, out var instanceInfo)) {
-			return InstanceActionFailure.InstanceDoesNotExist;
-		}
-        
-		if (agentState.InstancesByGuid.TryGetValue(instanceGuid, out var instance)) {
-			var status = instance.Status;
-			if (status.IsStopping()) {
-				return StopInstanceResult.InstanceAlreadyStopping;
-			}
-			else if (!status.CanStop()) {
-				return StopInstanceResult.InstanceAlreadyStopped;
-			}
-		}
-			
-		instanceInfo.Actor.Tell(new InstanceActor.StopInstanceCommand(command.StopStrategy));
-		return StopInstanceResult.StopInitiated;
-	}
-
-	private async Task<Result<SendCommandToInstanceResult, InstanceActionFailure>> SendCommandToInstance(SendCommandToInstanceCommand command) {
-		var instanceGuid = command.InstanceGuid;
-		if (!instances.TryGetValue(instanceGuid, out var instanceInfo)) {
-			return InstanceActionFailure.InstanceDoesNotExist;
-		}
-
-		try {
-			return await instanceInfo.Actor.Request(new InstanceActor.SendCommandToInstanceCommand(command.Command), shutdownCancellationToken);
-		} catch (OperationCanceledException) {
-			return InstanceActionFailure.AgentShuttingDown;
-		}
-	}
-
-	private async Task Shutdown(ShutdownCommand command) {
-		Logger.Information("Stopping all instances...");
-		
-		await shutdownCancellationTokenSource.CancelAsync();
-		
-		await Task.WhenAll(instances.Values.Select(static instance => instance.Actor.Stop(new InstanceActor.ShutdownCommand())));
-		instances.Clear();
-		
-		shutdownCancellationTokenSource.Dispose();
-		
-		Logger.Information("All instances stopped.");
-		
-		Context.Stop(Self);
-	}
-}

Agent/Phantom.Agent.Services/Instances/InstanceProcedureManager.cs

@@ -0,0 +1,85 @@
+using Phantom.Agent.Services.Instances.Procedures;
+using Phantom.Common.Data.Minecraft;
+using Phantom.Utils.Tasks;
+using Phantom.Utils.Threading;
+
+namespace Phantom.Agent.Services.Instances;
+
+sealed class InstanceProcedureManager : IAsyncDisposable {
+	private readonly record struct CurrentProcedure(IInstanceProcedure Procedure, CancellationTokenSource CancellationTokenSource);
+
+	private readonly ThreadSafeStructRef<CurrentProcedure> currentProcedure = new ();
+	private readonly ThreadSafeLinkedList<IInstanceProcedure> procedureQueue = new ();
+	private readonly AutoResetEvent procedureQueueReady = new (false);
+	private readonly ManualResetEventSlim procedureQueueFinished = new (false);
+
+	private readonly Instance instance;
+	private readonly IInstanceContext context;
+	private readonly CancellationTokenSource shutdownCancellationTokenSource = new ();
+
+	public InstanceProcedureManager(Instance instance, IInstanceContext context, TaskManager taskManager) {
+		this.instance = instance;
+		this.context = context;
+		taskManager.Run("Procedure manager for instance " + context.ShortName, Run);
+	}
+
+	public async Task Enqueue(IInstanceProcedure procedure, bool immediate = false) {
+		await procedureQueue.Add(procedure, toFront: immediate, shutdownCancellationTokenSource.Token);
+		procedureQueueReady.Set();
+	}
+
+	public async Task<IInstanceProcedure?> GetCurrentProcedure(CancellationToken cancellationToken) {
+		return (await currentProcedure.Get(cancellationToken))?.Procedure;
+	}
+
+	private async Task Run() {
+		try {
+			var shutdownCancellationToken = shutdownCancellationTokenSource.Token;
+			while (true) {
+				await procedureQueueReady.WaitOneAsync(shutdownCancellationToken);
+				while (await procedureQueue.TryTakeFromFront(shutdownCancellationToken) is {} nextProcedure) {
+					using var procedureCancellationTokenSource = new CancellationTokenSource();
+					await currentProcedure.Set(new CurrentProcedure(nextProcedure, procedureCancellationTokenSource), shutdownCancellationToken);
+					await RunProcedure(nextProcedure, procedureCancellationTokenSource.Token);
+					await currentProcedure.Set(null, shutdownCancellationToken);
+				}
+			}
+		} catch (OperationCanceledException) {
+			// Ignore.
+		}
+
+		await RunProcedure(new StopInstanceProcedure(MinecraftStopStrategy.Instant), CancellationToken.None);
+		procedureQueueFinished.Set();
+	}
+
+	private async Task RunProcedure(IInstanceProcedure procedure, CancellationToken cancellationToken) {
+		var procedureName = procedure.GetType().Name;
+
+		context.Logger.Debug("Started procedure: {Procedure}", procedureName);
+		try {
+			var newState = await procedure.Run(context, cancellationToken);
+			context.Logger.Debug("Finished procedure: {Procedure}", procedureName);
+
+			if (newState != null) {
+				instance.TransitionState(newState);
+			}
+		} catch (OperationCanceledException) {
+			context.Logger.Debug("Cancelled procedure: {Procedure}", procedureName);
+		} catch (Exception e) {
+			context.Logger.Error(e, "Caught exception while running procedure: {Procedure}", procedureName);
+		}
+	}
+
+	public async ValueTask DisposeAsync() {
+		shutdownCancellationTokenSource.Cancel();
+
+		(await currentProcedure.Get(CancellationToken.None))?.CancellationTokenSource.Cancel();
+		await procedureQueueFinished.WaitHandle.WaitOneAsync();
+
+		currentProcedure.Dispose();
+		procedureQueue.Dispose();
+		procedureQueueReady.Dispose();
+		procedureQueueFinished.Dispose();
+		shutdownCancellationTokenSource.Dispose();
+	}
+}

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

@@ -1,7 +1,7 @@
 using Phantom.Agent.Minecraft.Launcher;
-using Phantom.Agent.Rpc;
 using Phantom.Agent.Services.Backups;
+using Phantom.Utils.Tasks;
 
-namespace Phantom.Agent.Services.Instances;
+namespace Phantom.Agent.Services.Instances; 
 
-sealed record InstanceServices(ControllerConnection ControllerConnection, BackupManager BackupManager, LaunchServices LaunchServices);
+sealed record InstanceServices(TaskManager TaskManager, PortManager PortManager, BackupManager BackupManager, LaunchServices LaunchServices);

Agent/Phantom.Agent.Services/Instances/InstanceSessionManager.cs

@@ -0,0 +1,196 @@
+using System.Collections.Immutable;
+using System.Diagnostics.CodeAnalysis;
+using Phantom.Agent.Minecraft.Instance;
+using Phantom.Agent.Minecraft.Java;
+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.Common.Data;
+using Phantom.Common.Data.Agent;
+using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Minecraft;
+using Phantom.Common.Data.Replies;
+using Phantom.Common.Logging;
+using Phantom.Common.Messages.Agent.ToController;
+using Phantom.Utils.IO;
+using Phantom.Utils.Tasks;
+using Serilog;
+
+namespace Phantom.Agent.Services.Instances;
+
+sealed class InstanceSessionManager : IAsyncDisposable {
+	private static readonly ILogger Logger = PhantomLogger.Create<InstanceSessionManager>();
+
+	private readonly AgentInfo agentInfo;
+	private readonly string basePath;
+
+	private readonly InstanceServices instanceServices;
+	private readonly Dictionary<Guid, Instance> instances = new ();
+
+	private readonly CancellationTokenSource shutdownCancellationTokenSource = new ();
+	private readonly CancellationToken shutdownCancellationToken;
+	private readonly SemaphoreSlim semaphore = new (1, 1);
+
+	private uint instanceLoggerSequenceId = 0;
+
+	public InstanceSessionManager(AgentInfo agentInfo, AgentFolders agentFolders, JavaRuntimeRepository javaRuntimeRepository, TaskManager taskManager, BackupManager backupManager) {
+		this.agentInfo = agentInfo;
+		this.basePath = agentFolders.InstancesFolderPath;
+		this.shutdownCancellationToken = shutdownCancellationTokenSource.Token;
+
+		var minecraftServerExecutables = new MinecraftServerExecutables(agentFolders.ServerExecutableFolderPath);
+		var launchServices = new LaunchServices(minecraftServerExecutables, javaRuntimeRepository);
+		var portManager = new PortManager(agentInfo.AllowedServerPorts, agentInfo.AllowedRconPorts);
+
+		this.instanceServices = new InstanceServices(taskManager, portManager, backupManager, launchServices);
+	}
+
+	private async Task<InstanceActionResult<T>> AcquireSemaphoreAndRun<T>(Func<Task<InstanceActionResult<T>>> func) {
+		try {
+			await semaphore.WaitAsync(shutdownCancellationToken);
+			try {
+				return await func();
+			} finally {
+				semaphore.Release();
+			}
+		} catch (OperationCanceledException) {
+			return InstanceActionResult.General<T>(InstanceActionGeneralResult.AgentShuttingDown);
+		}
+	}
+
+	[SuppressMessage("ReSharper", "ConvertIfStatementToReturnStatement")]
+	private Task<InstanceActionResult<T>> AcquireSemaphoreAndRunWithInstance<T>(Guid instanceGuid, Func<Instance, Task<T>> func) {
+		return AcquireSemaphoreAndRun(async () => {
+			if (instances.TryGetValue(instanceGuid, out var instance)) {
+				return InstanceActionResult.Concrete(await func(instance));
+			}
+			else {
+				return InstanceActionResult.General<T>(InstanceActionGeneralResult.InstanceDoesNotExist);
+			}
+		});
+	}
+
+	public async Task<InstanceActionResult<ConfigureInstanceResult>> Configure(InstanceConfiguration configuration, InstanceLaunchProperties launchProperties, bool launchNow, bool alwaysReportStatus) {
+		return await AcquireSemaphoreAndRun(async () => {
+			var instanceGuid = configuration.InstanceGuid;
+			var instanceFolder = Path.Combine(basePath, instanceGuid.ToString());
+			Directories.Create(instanceFolder, Chmod.URWX_GRX);
+
+			var heapMegabytes = configuration.MemoryAllocation.InMegabytes;
+			var jvmProperties = new JvmProperties(
+				InitialHeapMegabytes: heapMegabytes / 2,
+				MaximumHeapMegabytes: heapMegabytes
+			);
+
+			var properties = new InstanceProperties(
+				instanceGuid,
+				configuration.JavaRuntimeGuid,
+				jvmProperties,
+				configuration.JvmArguments,
+				instanceFolder,
+				configuration.MinecraftVersion,
+				new ServerProperties(configuration.ServerPort, configuration.RconPort),
+				launchProperties
+			);
+
+			IServerLauncher launcher = configuration.MinecraftServerKind switch {
+				MinecraftServerKind.Vanilla => new VanillaLauncher(properties),
+				MinecraftServerKind.Fabric  => new FabricLauncher(properties),
+				_                           => InvalidLauncher.Instance
+			};
+
+			if (instances.TryGetValue(instanceGuid, out var instance)) {
+				await instance.Reconfigure(configuration, launcher, shutdownCancellationToken);
+				Logger.Information("Reconfigured instance \"{Name}\" (GUID {Guid}).", configuration.InstanceName, configuration.InstanceGuid);
+
+				if (alwaysReportStatus) {
+					instance.ReportLastStatus();
+				}
+			}
+			else {
+				instances[instanceGuid] = instance = new Instance(GetInstanceLoggerName(instanceGuid), instanceServices, configuration, launcher);
+				Logger.Information("Created instance \"{Name}\" (GUID {Guid}).", configuration.InstanceName, configuration.InstanceGuid);
+
+				instance.ReportLastStatus();
+				instance.IsRunningChanged += OnInstanceIsRunningChanged;
+			}
+
+			if (launchNow) {
+				await LaunchInternal(instance);
+			}
+
+			return InstanceActionResult.Concrete(ConfigureInstanceResult.Success);
+		});
+	}
+
+	private string GetInstanceLoggerName(Guid guid) {
+		var prefix = guid.ToString();
+		return prefix[..prefix.IndexOf('-')] + "/" + Interlocked.Increment(ref instanceLoggerSequenceId);
+	}
+
+	private ImmutableArray<Instance> GetRunningInstancesInternal() {
+		return instances.Values.Where(static instance => instance.IsRunning).ToImmutableArray();
+	}
+
+	private void OnInstanceIsRunningChanged(object? sender, EventArgs e) {
+		instanceServices.TaskManager.Run("Handle instance running state changed event", RefreshAgentStatus);
+	}
+
+	public async Task RefreshAgentStatus() {
+		try {
+			await semaphore.WaitAsync(shutdownCancellationToken);
+			try {
+				var runningInstances = GetRunningInstancesInternal();
+				var runningInstanceCount = runningInstances.Length;
+				var runningInstanceMemory = runningInstances.Aggregate(RamAllocationUnits.Zero, static (total, instance) => total + instance.Configuration.MemoryAllocation);
+				await ServerMessaging.Send(new ReportAgentStatusMessage(runningInstanceCount, runningInstanceMemory));
+			} finally {
+				semaphore.Release();
+			}
+		} catch (OperationCanceledException) {
+			// ignore
+		}
+	}
+
+	public Task<InstanceActionResult<LaunchInstanceResult>> Launch(Guid instanceGuid) {
+		return AcquireSemaphoreAndRunWithInstance(instanceGuid, LaunchInternal);
+	}
+
+	private async Task<LaunchInstanceResult> LaunchInternal(Instance instance) {
+		var runningInstances = GetRunningInstancesInternal();
+		if (runningInstances.Length + 1 > agentInfo.MaxInstances) {
+			return LaunchInstanceResult.InstanceLimitExceeded;
+		}
+
+		var availableMemory = agentInfo.MaxMemory - runningInstances.Aggregate(RamAllocationUnits.Zero, static (total, instance) => total + instance.Configuration.MemoryAllocation);
+		if (availableMemory < instance.Configuration.MemoryAllocation) {
+			return LaunchInstanceResult.MemoryLimitExceeded;
+		}
+
+		return await instance.Launch(shutdownCancellationToken);
+	}
+
+	public Task<InstanceActionResult<StopInstanceResult>> Stop(Guid instanceGuid, MinecraftStopStrategy stopStrategy) {
+		return AcquireSemaphoreAndRunWithInstance(instanceGuid, instance => instance.Stop(stopStrategy, shutdownCancellationToken));
+	}
+
+	public Task<InstanceActionResult<SendCommandToInstanceResult>> SendCommand(Guid instanceGuid, string command) {
+		return AcquireSemaphoreAndRunWithInstance(instanceGuid, async instance => await instance.SendCommand(command, shutdownCancellationToken) ? SendCommandToInstanceResult.Success : SendCommandToInstanceResult.UnknownError);
+	}
+
+	public async ValueTask DisposeAsync() {
+		Logger.Information("Stopping all instances...");
+		
+		shutdownCancellationTokenSource.Cancel();
+
+		await semaphore.WaitAsync(CancellationToken.None);
+		await Task.WhenAll(instances.Values.Select(static instance => instance.DisposeAsync().AsTask()));
+		instances.Clear();
+		
+		shutdownCancellationTokenSource.Dispose();
+		semaphore.Dispose();
+	}
+}

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

@@ -1,100 +0,0 @@
-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;
-
-sealed class InstanceTicketManager {
-	private static readonly ILogger Logger = PhantomLogger.Create<InstanceTicketManager>();
-	
-	private readonly AgentInfo agentInfo;
-	private readonly ControllerConnection controllerConnection;
-	
-	private readonly HashSet<Guid> activeTicketGuids = new ();
-	private readonly HashSet<ushort> usedPorts = new ();
-	private RamAllocationUnits usedMemory = new ();
-
-	public InstanceTicketManager(AgentInfo agentInfo, ControllerConnection controllerConnection) {
-		this.agentInfo = agentInfo;
-		this.controllerConnection = controllerConnection;
-	}
-
-	public Result<Ticket, LaunchInstanceResult> Reserve(InstanceConfiguration configuration) {
-		var memoryAllocation = configuration.MemoryAllocation;
-		var serverPort = configuration.ServerPort;
-		var rconPort = configuration.RconPort;
-		
-		if (!agentInfo.AllowedServerPorts.Contains(serverPort)) {
-			return LaunchInstanceResult.ServerPortNotAllowed;
-		}
-
-		if (!agentInfo.AllowedRconPorts.Contains(rconPort)) {
-			return LaunchInstanceResult.RconPortNotAllowed;
-		}
-		
-		lock (this) {
-			if (activeTicketGuids.Count + 1 > agentInfo.MaxInstances) {
-				return LaunchInstanceResult.InstanceLimitExceeded;
-			}
-
-			if (usedMemory + memoryAllocation > agentInfo.MaxMemory) {
-				return LaunchInstanceResult.MemoryLimitExceeded;
-			}
-			
-			if (usedPorts.Contains(serverPort)) {
-				return LaunchInstanceResult.ServerPortAlreadyInUse;
-			}
-
-			if (usedPorts.Contains(rconPort)) {
-				return LaunchInstanceResult.RconPortAlreadyInUse;
-			}
-
-			var ticket = new Ticket(Guid.NewGuid(), memoryAllocation, serverPort, rconPort);
-			
-			activeTicketGuids.Add(ticket.TicketGuid);
-			usedMemory += memoryAllocation;
-			usedPorts.Add(serverPort);
-			usedPorts.Add(rconPort);
-			
-			RefreshAgentStatus();
-			Logger.Debug("Reserved ticket {TicketGuid} (server port {ServerPort}, rcon port {RconPort}, memory allocation {MemoryAllocation} MB).", ticket.TicketGuid, ticket.ServerPort, ticket.RconPort, ticket.MemoryAllocation.InMegabytes);
-
-			return ticket;
-		}
-	}
-
-	public bool IsValid(Ticket ticket) {
-		lock (this) {
-			return activeTicketGuids.Contains(ticket.TicketGuid);
-		}
-	}
-	
-	public void Release(Ticket ticket) {
-		lock (this) {
-			if (!activeTicketGuids.Remove(ticket.TicketGuid)) {
-				return;
-			}
-
-			usedMemory -= ticket.MemoryAllocation;
-			usedPorts.Remove(ticket.ServerPort);
-			usedPorts.Remove(ticket.RconPort);
-			
-			RefreshAgentStatus();
-			Logger.Debug("Released ticket {TicketGuid} (server port {ServerPort}, rcon port {RconPort}, memory allocation {MemoryAllocation} MB).", ticket.TicketGuid, ticket.ServerPort, ticket.RconPort, ticket.MemoryAllocation.InMegabytes);
-		}
-	}
-	
-	public void RefreshAgentStatus() {
-		lock (this) {
-			controllerConnection.Send(new ReportAgentStatusMessage(activeTicketGuids.Count, usedMemory));
-		}
-	}
-	
-	public sealed record Ticket(Guid TicketGuid, RamAllocationUnits MemoryAllocation, ushort ServerPort, ushort RconPort);
-}

Agent/Phantom.Agent.Services/Instances/PortManager.cs

@@ -0,0 +1,58 @@
+using Phantom.Common.Data;
+using Phantom.Common.Data.Instance;
+
+namespace Phantom.Agent.Services.Instances;
+
+sealed class PortManager {
+	private readonly AllowedPorts allowedServerPorts;
+	private readonly AllowedPorts allowedRconPorts;
+	private readonly HashSet<ushort> usedPorts = new ();
+
+	public PortManager(AllowedPorts allowedServerPorts, AllowedPorts allowedRconPorts) {
+		this.allowedServerPorts = allowedServerPorts;
+		this.allowedRconPorts = allowedRconPorts;
+	}
+
+	public Result Reserve(InstanceConfiguration configuration) {
+		var serverPort = configuration.ServerPort;
+		var rconPort = configuration.RconPort;
+		
+		if (!allowedServerPorts.Contains(serverPort)) {
+			return Result.ServerPortNotAllowed;
+		}
+
+		if (!allowedRconPorts.Contains(rconPort)) {
+			return Result.RconPortNotAllowed;
+		}
+		
+		lock (usedPorts) {
+			if (usedPorts.Contains(serverPort)) {
+				return Result.ServerPortAlreadyInUse;
+			}
+
+			if (usedPorts.Contains(rconPort)) {
+				return Result.RconPortAlreadyInUse;
+			}
+
+			usedPorts.Add(serverPort);
+			usedPorts.Add(rconPort);
+		}
+
+		return Result.Success;
+	}
+	
+	public void Release(InstanceConfiguration configuration) {
+		lock (usedPorts) {
+			usedPorts.Remove(configuration.ServerPort);
+			usedPorts.Remove(configuration.RconPort);
+		}
+	}
+
+	public enum Result {
+		Success,
+		ServerPortNotAllowed,
+		ServerPortAlreadyInUse,
+		RconPortNotAllowed,
+		RconPortAlreadyInUse
+	}
+}

Agent/Phantom.Agent.Services/Instances/Procedures/BackupInstanceProcedure.cs

@@ -0,0 +1,29 @@
+using Phantom.Agent.Services.Backups;
+using Phantom.Agent.Services.Instances.States;
+using Phantom.Common.Data.Backups;
+
+namespace Phantom.Agent.Services.Instances.Procedures;
+
+sealed record BackupInstanceProcedure(BackupManager BackupManager) : IInstanceProcedure {
+	private readonly TaskCompletionSource<BackupCreationResult> resultCompletionSource = new ();
+
+	public Task<BackupCreationResult> Result => resultCompletionSource.Task;
+
+	public async Task<IInstanceState?> Run(IInstanceContext context, CancellationToken cancellationToken) {
+		if (context.CurrentState is not InstanceRunningState runningState || runningState.Process.HasEnded) {
+			resultCompletionSource.SetResult(new BackupCreationResult(BackupCreationResultKind.InstanceNotRunning));
+			return null;
+		}
+
+		try {
+			var result = await BackupManager.CreateBackup(context.ShortName, runningState.Process, cancellationToken);
+			resultCompletionSource.SetResult(result);
+		} catch (OperationCanceledException) {
+			resultCompletionSource.SetCanceled(cancellationToken);
+		} catch (Exception e) {
+			resultCompletionSource.SetException(e);
+		}
+
+		return null;
+	}
+}

Agent/Phantom.Agent.Services/Instances/Procedures/IInstanceProcedure.cs

@@ -0,0 +1,7 @@
+using Phantom.Agent.Services.Instances.States;
+
+namespace Phantom.Agent.Services.Instances.Procedures; 
+
+interface IInstanceProcedure {
+	Task<IInstanceState?> Run(IInstanceContext context, CancellationToken cancellationToken);
+}

Agent/Phantom.Agent.Services/Instances/Procedures/LaunchInstanceProcedure.cs

@@ -0,0 +1,97 @@
+using Phantom.Agent.Minecraft.Instance;
+using Phantom.Agent.Minecraft.Launcher;
+using Phantom.Agent.Minecraft.Server;
+using Phantom.Agent.Services.Instances.States;
+using Phantom.Common.Data.Instance;
+
+namespace Phantom.Agent.Services.Instances.Procedures;
+
+sealed record LaunchInstanceProcedure(InstanceConfiguration Configuration, IServerLauncher Launcher, bool IsRestarting = false) : IInstanceProcedure {
+	public async Task<IInstanceState?> Run(IInstanceContext context, CancellationToken cancellationToken) {
+		if (!IsRestarting && context.CurrentState is InstanceRunningState) {
+			return null;
+		}
+		
+		context.SetStatus(IsRestarting ? InstanceStatus.Restarting : InstanceStatus.Launching);
+
+		InstanceLaunchFailReason? failReason = context.Services.PortManager.Reserve(Configuration) switch {
+			PortManager.Result.ServerPortNotAllowed   => InstanceLaunchFailReason.ServerPortNotAllowed,
+			PortManager.Result.ServerPortAlreadyInUse => InstanceLaunchFailReason.ServerPortAlreadyInUse,
+			PortManager.Result.RconPortNotAllowed     => InstanceLaunchFailReason.RconPortNotAllowed,
+			PortManager.Result.RconPortAlreadyInUse   => InstanceLaunchFailReason.RconPortAlreadyInUse,
+			_                                         => null
+		};
+
+		if (failReason is {} reason) {
+			context.SetLaunchFailedStatusAndReportEvent(reason);
+			return new InstanceNotRunningState();
+		}
+		
+		context.Logger.Information("Session starting...");
+		try {
+			InstanceProcess process = await DoLaunch(context, cancellationToken);
+			return new InstanceRunningState(Configuration, Launcher, process, context);
+		} catch (OperationCanceledException) {
+			context.SetStatus(InstanceStatus.NotRunning);
+		} catch (LaunchFailureException e) {
+			context.Logger.Error(e.LogMessage);
+			context.SetLaunchFailedStatusAndReportEvent(e.Reason);
+		} catch (Exception e) {
+			context.Logger.Error(e, "Caught exception while launching instance.");
+			context.SetLaunchFailedStatusAndReportEvent(InstanceLaunchFailReason.UnknownError);
+		}
+		
+		context.Services.PortManager.Release(Configuration);
+		return new InstanceNotRunningState();
+	}
+
+	private async Task<InstanceProcess> DoLaunch(IInstanceContext context, CancellationToken cancellationToken) {
+		cancellationToken.ThrowIfCancellationRequested();
+
+		byte lastDownloadProgress = byte.MaxValue;
+
+		void OnDownloadProgress(object? sender, DownloadProgressEventArgs args) {
+			byte progress = (byte) Math.Min(args.DownloadedBytes * 100 / args.TotalBytes, 100);
+
+			if (lastDownloadProgress != progress) {
+				lastDownloadProgress = progress;
+				context.SetStatus(InstanceStatus.Downloading(progress));
+			}
+		}
+
+		var launchResult = await Launcher.Launch(context.Logger, context.Services.LaunchServices, OnDownloadProgress, cancellationToken);
+		if (launchResult is LaunchResult.InvalidJavaRuntime) {
+			throw new LaunchFailureException(InstanceLaunchFailReason.JavaRuntimeNotFound, "Session failed to launch, invalid Java runtime.");
+		}
+		else if (launchResult is LaunchResult.CouldNotDownloadMinecraftServer) {
+			throw new LaunchFailureException(InstanceLaunchFailReason.CouldNotDownloadMinecraftServer, "Session failed to launch, could not download Minecraft server.");
+		}
+		else if (launchResult is LaunchResult.CouldNotPrepareMinecraftServerLauncher) {
+			throw new LaunchFailureException(InstanceLaunchFailReason.CouldNotPrepareMinecraftServerLauncher, "Session failed to launch, could not prepare Minecraft server launcher.");
+		}
+		else if (launchResult is LaunchResult.CouldNotConfigureMinecraftServer) {
+			throw new LaunchFailureException(InstanceLaunchFailReason.CouldNotConfigureMinecraftServer, "Session failed to launch, could not configure Minecraft server.");
+		}
+		else if (launchResult is LaunchResult.CouldNotStartMinecraftServer) {
+			throw new LaunchFailureException(InstanceLaunchFailReason.CouldNotStartMinecraftServer, "Session failed to launch, could not start Minecraft server.");
+		}
+
+		if (launchResult is not LaunchResult.Success launchSuccess) {
+			throw new LaunchFailureException(InstanceLaunchFailReason.UnknownError, "Session failed to launch.");
+		}
+
+		context.SetStatus(InstanceStatus.Running);
+		context.ReportEvent(InstanceEvent.LaunchSucceded);
+		return launchSuccess.Process;
+	}
+
+	private sealed class LaunchFailureException : Exception {
+		public InstanceLaunchFailReason Reason { get; }
+		public string LogMessage { get; }
+
+		public LaunchFailureException(InstanceLaunchFailReason reason, string logMessage) {
+			this.Reason = reason;
+			this.LogMessage = logMessage;
+		}
+	}
+}

Agent/Phantom.Agent.Services/Instances/Procedures/SetInstanceToNotRunningStateProcedure.cs

@@ -0,0 +1,17 @@
+using Phantom.Agent.Services.Instances.States;
+using Phantom.Common.Data.Instance;
+
+namespace Phantom.Agent.Services.Instances.Procedures;
+
+sealed record SetInstanceToNotRunningStateProcedure(IInstanceStatus Status) : IInstanceProcedure {
+	public Task<IInstanceState?> Run(IInstanceContext context, CancellationToken cancellationToken) {
+		if (context.CurrentState is InstanceRunningState { Process.HasEnded: true }) {
+			context.SetStatus(Status);
+			context.ReportEvent(InstanceEvent.Stopped);
+			return Task.FromResult<IInstanceState?>(new InstanceNotRunningState());
+		}
+		else {
+			return Task.FromResult<IInstanceState?>(null);
+		}
+	}
+}

Agent/Phantom.Agent.Services/Instances/Procedures/StopInstanceProcedure.cs

@@ -1,46 +1,51 @@
 using System.Diagnostics;
 using Phantom.Agent.Minecraft.Command;
 using Phantom.Agent.Minecraft.Instance;
+using Phantom.Agent.Services.Instances.States;
 using Phantom.Common.Data.Instance;
 using Phantom.Common.Data.Minecraft;
 
-namespace Phantom.Agent.Services.Instances.State;
+namespace Phantom.Agent.Services.Instances.Procedures;
 
-static class InstanceStopProcedure {
+sealed record StopInstanceProcedure(MinecraftStopStrategy StopStrategy) : IInstanceProcedure {
 	private static readonly ushort[] Stops = { 60, 30, 10, 5, 4, 3, 2, 1, 0 };
 
-	public static async Task<bool> Run(InstanceContext context, MinecraftStopStrategy stopStrategy, InstanceRunningState runningState, Action<IInstanceStatus> reportStatus, CancellationToken cancellationToken) {
+	public async Task<IInstanceState?> Run(IInstanceContext context, CancellationToken cancellationToken) {
-		var process = runningState.Process;
+		if (context.CurrentState is not InstanceRunningState runningState) {
-		runningState.IsStopping = true;
+			return null;
+		}
 
-		var seconds = stopStrategy.Seconds;
+		var process = runningState.Process;
+
+		runningState.IsStopping = true;
+		context.SetStatus(InstanceStatus.Stopping);
+
+		var seconds = StopStrategy.Seconds;
 		if (seconds > 0) {
 			try {
 				await CountDownWithAnnouncements(context, process, seconds, cancellationToken);
 			} catch (OperationCanceledException) {
 				runningState.IsStopping = false;
-				return false;
+				return null;
 			}
 		}
 
 		try {
 			// Too late to cancel the stop procedure now.
-			runningState.OnStopInitiated();
-			
 			if (!process.HasEnded) {
 				context.Logger.Information("Session stopping now.");
 				await DoStop(context, process);
 			}
 		} finally {
 			context.Logger.Information("Session stopped.");
-			reportStatus(InstanceStatus.NotRunning);
+			context.SetStatus(InstanceStatus.NotRunning);
 			context.ReportEvent(InstanceEvent.Stopped);
 		}
 
-		return true;
+		return new InstanceNotRunningState();
 	}
 
-	private static async Task CountDownWithAnnouncements(InstanceContext context, InstanceProcess process, ushort seconds, CancellationToken cancellationToken) {
+	private async Task CountDownWithAnnouncements(IInstanceContext context, InstanceProcess process, ushort seconds, CancellationToken cancellationToken) {
 		context.Logger.Information("Session stopping in {Seconds} seconds.", seconds);
 
 		foreach (var stop in Stops) {
@@ -61,7 +66,7 @@ static class InstanceStopProcedure {
 		return MinecraftCommand.Say("Server shutting down in " + seconds + (seconds == 1 ? " second." : " seconds."));
 	}
 
-	private static async Task DoStop(InstanceContext context, InstanceProcess process) {
+	private async Task DoStop(IInstanceContext context, InstanceProcess process) {
 		context.Logger.Information("Sending stop command...");
 		await TrySendStopCommand(context, process);
 
@@ -69,7 +74,7 @@ static class InstanceStopProcedure {
 		await WaitForSessionToEnd(context, process);
 	}
 
-	private static async Task TrySendStopCommand(InstanceContext context, InstanceProcess process) {
+	private async Task TrySendStopCommand(IInstanceContext context, InstanceProcess process) {
 		using var timeout = new CancellationTokenSource(TimeSpan.FromSeconds(5));
 		try {
 			await process.SendCommand(MinecraftCommand.Stop, timeout.Token);
@@ -77,17 +82,16 @@ static class InstanceStopProcedure {
 			// Ignore.
 		} catch (ObjectDisposedException e) when (e.ObjectName == typeof(Process).FullName && process.HasEnded) {
 			// Ignore.
-		} catch (IOException e) when (e.HResult == -2147024664 /* The pipe is being closed */) {
-			// Ignore.
 		} catch (Exception e) {
 			context.Logger.Warning(e, "Caught exception while sending stop command.");
 		}
 	}
 
-	private static async Task WaitForSessionToEnd(InstanceContext context, InstanceProcess process) {
+	private async Task WaitForSessionToEnd(IInstanceContext context, InstanceProcess process) {
+		using var timeout = new CancellationTokenSource(TimeSpan.FromSeconds(55));
 		try {
-			await process.WaitForExit(TimeSpan.FromSeconds(55));
+			await process.WaitForExit(timeout.Token);
-		} catch (TimeoutException) {
+		} catch (OperationCanceledException) {
 			try {
 				context.Logger.Warning("Waiting timed out, killing session...");
 				process.Kill();

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

@@ -1,86 +0,0 @@
-using Phantom.Agent.Minecraft.Instance;
-using Phantom.Agent.Minecraft.Launcher;
-using Phantom.Agent.Minecraft.Server;
-using Phantom.Common.Data;
-using Phantom.Common.Data.Instance;
-
-namespace Phantom.Agent.Services.Instances.State;
-
-static class InstanceLaunchProcedure {
-	public static async Task<InstanceRunningState?> Run(InstanceContext context, InstanceConfiguration configuration, IServerLauncher launcher, InstanceTicketManager ticketManager, InstanceTicketManager.Ticket ticket, Action<IInstanceStatus> reportStatus, CancellationToken cancellationToken) {
-		context.Logger.Information("Session starting...");
-
-		Result<InstanceProcess, InstanceLaunchFailReason> result;
-
-		if (ticketManager.IsValid(ticket)) {
-			try {
-				result = await LaunchInstance(context, launcher, reportStatus, cancellationToken);
-			} catch (OperationCanceledException) {
-				reportStatus(InstanceStatus.NotRunning);
-				return null;
-			} catch (Exception e) {
-				context.Logger.Error(e, "Caught exception while launching instance.");
-				result = InstanceLaunchFailReason.UnknownError;
-			}
-		}
-		else {
-			context.Logger.Error("Attempted to launch instance with an invalid ticket!");
-			result = InstanceLaunchFailReason.UnknownError;
-		}
-
-		if (result) {
-			reportStatus(InstanceStatus.Running);
-			context.ReportEvent(InstanceEvent.LaunchSucceeded);
-			return new InstanceRunningState(context, configuration, launcher, ticket, result.Value, cancellationToken);
-		}
-		else {
-			reportStatus(InstanceStatus.Failed(result.Error));
-			context.ReportEvent(new InstanceLaunchFailedEvent(result.Error));
-			return null;
-		}
-	}
-
-	private static async Task<Result<InstanceProcess, InstanceLaunchFailReason>> LaunchInstance(InstanceContext context, IServerLauncher launcher, Action<IInstanceStatus> reportStatus, CancellationToken cancellationToken) {
-		cancellationToken.ThrowIfCancellationRequested();
-
-		byte lastDownloadProgress = byte.MaxValue;
-
-		void OnDownloadProgress(object? sender, DownloadProgressEventArgs args) {
-			byte progress = (byte) Math.Min(args.DownloadedBytes * 100 / args.TotalBytes, 100);
-
-			if (lastDownloadProgress != progress) {
-				lastDownloadProgress = progress;
-				reportStatus(InstanceStatus.Downloading(progress));
-			}
-		}
-
-		switch (await launcher.Launch(context.Logger, context.Services.LaunchServices, OnDownloadProgress, cancellationToken)) {
-			case LaunchResult.Success launchSuccess:
-				return launchSuccess.Process;
-
-			case LaunchResult.InvalidJavaRuntime:
-				context.Logger.Error("Session failed to launch, invalid Java runtime.");
-				return InstanceLaunchFailReason.JavaRuntimeNotFound;
-
-			case LaunchResult.CouldNotDownloadMinecraftServer:
-				context.Logger.Error("Session failed to launch, could not download Minecraft server.");
-				return InstanceLaunchFailReason.CouldNotDownloadMinecraftServer;
-
-			case LaunchResult.CouldNotPrepareMinecraftServerLauncher:
-				context.Logger.Error("Session failed to launch, could not prepare Minecraft server launcher.");
-				return InstanceLaunchFailReason.CouldNotPrepareMinecraftServerLauncher;
-
-			case LaunchResult.CouldNotConfigureMinecraftServer:
-				context.Logger.Error("Session failed to launch, could not configure Minecraft server.");
-				return InstanceLaunchFailReason.CouldNotConfigureMinecraftServer;
-
-			case LaunchResult.CouldNotStartMinecraftServer:
-				context.Logger.Error("Session failed to launch, could not start Minecraft server.");
-				return InstanceLaunchFailReason.CouldNotStartMinecraftServer;
-
-			default:
-				context.Logger.Error("Session failed to launch.");
-				return InstanceLaunchFailReason.UnknownError;
-		}
-	}
-}

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

@@ -1,140 +0,0 @@
-using Phantom.Agent.Minecraft.Instance;
-using Phantom.Agent.Minecraft.Server;
-using Phantom.Agent.Rpc;
-using Phantom.Common.Data.Instance;
-using Phantom.Common.Messages.Agent.ToController;
-using Phantom.Utils.Logging;
-using Phantom.Utils.Tasks;
-using Phantom.Utils.Threading;
-
-namespace Phantom.Agent.Services.Instances.State;
-
-sealed class InstancePlayerCountTracker : CancellableBackgroundTask {
-	private readonly ControllerConnection controllerConnection;
-	private readonly Guid instanceGuid;
-	private readonly ushort serverPort;
-	private readonly InstanceProcess process;
-
-	private readonly TaskCompletionSource firstDetection = AsyncTasks.CreateCompletionSource();
-	private readonly ManualResetEventSlim serverOutputEvent = new ();
-
-	private InstancePlayerCounts? playerCounts;
-
-	public InstancePlayerCounts? PlayerCounts {
-		get {
-			lock (this) {
-				return playerCounts;
-			}
-		}
-		private set {
-			EventHandler<int?>? onlinePlayerCountChanged;
-			lock (this) {
-				if (playerCounts == value) {
-					return;
-				}
-				
-				playerCounts = value;
-				onlinePlayerCountChanged = OnlinePlayerCountChanged;
-			}
-
-			onlinePlayerCountChanged?.Invoke(this, value?.Online);
-			controllerConnection.Send(new ReportInstancePlayerCountsMessage(instanceGuid, value));
-		}
-	}
-
-	private event EventHandler<int?>? OnlinePlayerCountChanged;
-
-	private bool isDisposed = false;
-
-	public InstancePlayerCountTracker(InstanceContext context, InstanceProcess process, ushort serverPort) : base(PhantomLogger.Create<InstancePlayerCountTracker>(context.ShortName)) {
-		this.controllerConnection = context.Services.ControllerConnection;
-		this.instanceGuid = context.InstanceGuid;
-		this.process = process;
-		this.serverPort = serverPort;
-		Start();
-	}
-
-	protected override async Task RunTask() {
-		// Give the server time to start accepting connections.
-		await Task.Delay(TimeSpan.FromSeconds(10), CancellationToken);
-
-		serverOutputEvent.Set();
-		process.AddOutputListener(OnOutput, maxLinesToReadFromHistory: 0);
-		
-		while (!CancellationToken.IsCancellationRequested) {
-			serverOutputEvent.Reset();
-
-			PlayerCounts = await TryGetPlayerCounts();
-			
-			if (!firstDetection.Task.IsCompleted) {
-				firstDetection.SetResult();
-			}
-
-			await Task.Delay(TimeSpan.FromSeconds(10), CancellationToken);
-			await serverOutputEvent.WaitHandle.WaitOneAsync(CancellationToken);
-			await Task.Delay(TimeSpan.FromSeconds(1), CancellationToken);
-		}
-	}
-
-	private async Task<InstancePlayerCounts?> TryGetPlayerCounts() {
-		try {
-			var result = await ServerStatusProtocol.GetPlayerCounts(serverPort, CancellationToken);
-			Logger.Debug("Detected {OnlinePlayerCount} / {MaximumPlayerCount} online player(s).", result.Online, result.Maximum);
-			return result;
-		} catch (ServerStatusProtocol.ProtocolException e) {
-			Logger.Error(e.Message);
-			return null;
-		} catch (Exception e) {
-			Logger.Error(e, "Caught exception while checking online player count.");
-			return null;
-		}
-	}
-
-	public async Task WaitForOnlinePlayers(CancellationToken cancellationToken) {
-		await firstDetection.Task.WaitAsync(cancellationToken);
-
-		var onlinePlayersDetected = AsyncTasks.CreateCompletionSource();
-
-		lock (this) {
-			if (playerCounts is { Online: > 0 }) {
-				return;
-			}
-			else if (playerCounts == null) {
-				throw new InvalidOperationException();
-			}
-
-			OnlinePlayerCountChanged += OnOnlinePlayerCountChanged;
-
-			void OnOnlinePlayerCountChanged(object? sender, int? newPlayerCount) {
-				if (newPlayerCount == null) {
-					onlinePlayersDetected.TrySetException(new InvalidOperationException());
-					OnlinePlayerCountChanged -= OnOnlinePlayerCountChanged;
-				}
-				else if (newPlayerCount > 0) {
-					onlinePlayersDetected.TrySetResult();
-					OnlinePlayerCountChanged -= OnOnlinePlayerCountChanged;
-				}
-			}
-		}
-
-		await onlinePlayersDetected.Task;
-	}
-
-	private void OnOutput(object? sender, string? line) {
-		lock (this) {
-			if (!isDisposed) {
-				serverOutputEvent.Set();
-			}
-		}
-	}
-
-	protected override void Dispose() {
-		lock (this) {
-			isDisposed = true;
-			playerCounts = null;
-		}
-
-		process.RemoveOutputListener(OnOutput);
-		serverOutputEvent.Dispose();
-	}
-}

Agent/Phantom.Agent.Services/Instances/States/IInstanceState.cs

@@ -0,0 +1,6 @@
+namespace Phantom.Agent.Services.Instances.States; 
+
+interface IInstanceState {
+	void Initialize();
+	Task<bool> SendCommand(string command, CancellationToken cancellationToken);
+}

Agent/Phantom.Agent.Services/Instances/States/InstanceNotRunningState.cs

@@ -0,0 +1,9 @@
+namespace Phantom.Agent.Services.Instances.States; 
+
+sealed class InstanceNotRunningState : IInstanceState {
+	public void Initialize() {}
+
+	public Task<bool> SendCommand(string command, CancellationToken cancellationToken) {
+		return Task.FromResult(false);
+	}
+}

Agent/Phantom.Agent.Services/Instances/States/InstanceRunningState.cs

@@ -1,41 +1,35 @@
 using Phantom.Agent.Minecraft.Instance;
 using Phantom.Agent.Minecraft.Launcher;
 using Phantom.Agent.Services.Backups;
+using Phantom.Agent.Services.Instances.Procedures;
 using Phantom.Common.Data.Backups;
 using Phantom.Common.Data.Instance;
-using Phantom.Common.Data.Replies;
 
-namespace Phantom.Agent.Services.Instances.State;
+namespace Phantom.Agent.Services.Instances.States;
 
-sealed class InstanceRunningState : IDisposable {
+sealed class InstanceRunningState : IInstanceState, IDisposable {
-	public InstanceTicketManager.Ticket Ticket { get; }
 	public InstanceProcess Process { get; }
 
 	internal bool IsStopping { get; set; }
 
-	private readonly InstanceContext context;
 	private readonly InstanceConfiguration configuration;
 	private readonly IServerLauncher launcher;
-	private readonly CancellationToken cancellationToken;
+	private readonly IInstanceContext context;
 
 	private readonly InstanceLogSender logSender;
-	private readonly InstancePlayerCountTracker playerCountTracker;
 	private readonly BackupScheduler backupScheduler;
 
 	private bool isDisposed;
 
-	public InstanceRunningState(InstanceContext context, InstanceConfiguration configuration, IServerLauncher launcher, InstanceTicketManager.Ticket ticket, InstanceProcess process, CancellationToken cancellationToken) {
+	public InstanceRunningState(InstanceConfiguration configuration, IServerLauncher launcher, InstanceProcess process, IInstanceContext context) {
-		this.context = context;
 		this.configuration = configuration;
 		this.launcher = launcher;
-		this.Ticket = ticket;
+		this.context = context;
 		this.Process = process;
-		this.cancellationToken = cancellationToken;
 
-		this.logSender = new InstanceLogSender(context.Services.ControllerConnection, context.InstanceGuid, context.ShortName);
+		this.logSender = new InstanceLogSender(context.Services.TaskManager, configuration.InstanceGuid, context.ShortName);
-		this.playerCountTracker = new InstancePlayerCountTracker(context, process, configuration.ServerPort);
 
-		this.backupScheduler = new BackupScheduler(context, playerCountTracker);
+		this.backupScheduler = new BackupScheduler(context.Services.TaskManager, context.Services.BackupManager, process, context, configuration.ServerPort);
 		this.backupScheduler.BackupCompleted += OnScheduledBackupCompleted;
 	}
 
@@ -45,7 +39,7 @@ sealed class InstanceRunningState : IDisposable {
 		if (Process.HasEnded) {
 			if (TryDispose()) {
 				context.Logger.Warning("Session ended immediately after it was started.");
-				context.Actor.Tell(new InstanceActor.HandleProcessEndedCommand(InstanceStatus.Failed(InstanceLaunchFailReason.UnknownError)));
+				context.EnqueueProcedure(new SetInstanceToNotRunningStateProcedure(InstanceStatus.Failed(InstanceLaunchFailReason.UnknownError)), immediate: true);
 			}
 		}
 		else {
@@ -64,17 +58,13 @@ sealed class InstanceRunningState : IDisposable {
 			return;
 		}
 
-		if (cancellationToken.IsCancellationRequested) {
-			return;
-		}
-		
 		if (IsStopping) {
-			context.Actor.Tell(new InstanceActor.HandleProcessEndedCommand(InstanceStatus.NotRunning));
+			context.EnqueueProcedure(new SetInstanceToNotRunningStateProcedure(InstanceStatus.NotRunning), immediate: true);
 		}
 		else {
 			context.Logger.Information("Session ended unexpectedly, restarting...");
 			context.ReportEvent(InstanceEvent.Crashed);
-			context.Actor.Tell(new InstanceActor.LaunchInstanceCommand(configuration, launcher, Ticket, IsRestarting: true));
+			context.EnqueueProcedure(new LaunchInstanceProcedure(configuration, launcher, IsRestarting: true));
 		}
 	}
 
@@ -82,24 +72,19 @@ sealed class InstanceRunningState : IDisposable {
 		context.ReportEvent(new InstanceBackupCompletedEvent(e.Kind, e.Warnings));
 	}
 
-	public async Task<SendCommandToInstanceResult> SendCommand(string command, CancellationToken cancellationToken) {
+	public async Task<bool> SendCommand(string command, CancellationToken cancellationToken) {
 		try {
 			context.Logger.Information("Sending command: {Command}", command);
 			await Process.SendCommand(command, cancellationToken);
-			return SendCommandToInstanceResult.Success;
+			return true;
 		} catch (OperationCanceledException) {
-			return SendCommandToInstanceResult.UnknownError;
+			return false;
 		} catch (Exception e) {
 			context.Logger.Warning(e, "Caught exception while sending command.");
-			return SendCommandToInstanceResult.UnknownError;
+			return false;
 		}
 	}
 
-	public void OnStopInitiated() {
-		backupScheduler.Stop();
-		playerCountTracker.Stop();
-	}
-	
 	private bool TryDispose() {
 		lock (this) {
 			if (isDisposed) {
@@ -109,10 +94,11 @@ sealed class InstanceRunningState : IDisposable {
 			isDisposed = true;
 		}
 
-		OnStopInitiated();
 		logSender.Stop();
+		backupScheduler.Stop();
 		
 		Process.Dispose();
+		context.Services.PortManager.Release(configuration);
 		
 		return true;
 	}

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

@@ -1,101 +0,0 @@
-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> {
-	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 HandleConfigureInstance(message, alwaysReportStatus: false);
-	}
-
-	private async Task<Result<LaunchInstanceResult, InstanceActionFailure>> HandleLaunchInstance(LaunchInstanceMessage message) {
-		return await agent.InstanceManager.Request(new InstanceManagerActor.LaunchInstanceCommand(message.InstanceGuid));
-	}
-
-	private async Task<Result<StopInstanceResult, InstanceActionFailure>> HandleStopInstance(StopInstanceMessage message) {
-		return await agent.InstanceManager.Request(new InstanceManagerActor.StopInstanceCommand(message.InstanceGuid, message.StopStrategy));
-	}
-
-	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.Services/Rpc/MessageListener.cs

@@ -0,0 +1,89 @@
+using Phantom.Agent.Rpc;
+using Phantom.Common.Data.Instance;
+using Phantom.Common.Data.Replies;
+using Phantom.Common.Logging;
+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.Rpc;
+using Phantom.Utils.Rpc.Message;
+using Serilog;
+
+namespace Phantom.Agent.Services.Rpc;
+
+public sealed class MessageListener : IMessageToAgentListener {
+	private static ILogger Logger { get; } = PhantomLogger.Create<MessageListener>();
+
+	private readonly RpcConnectionToServer<IMessageToControllerListener> connection;
+	private readonly AgentServices agent;
+	private readonly CancellationTokenSource shutdownTokenSource;
+
+	public MessageListener(RpcConnectionToServer<IMessageToControllerListener> connection, AgentServices agent, CancellationTokenSource shutdownTokenSource) {
+		this.connection = connection;
+		this.agent = agent;
+		this.shutdownTokenSource = shutdownTokenSource;
+	}
+
+	public async Task<NoReply> HandleRegisterAgentSuccess(RegisterAgentSuccessMessage message) {
+		Logger.Information("Agent authentication successful.");
+
+		void ShutdownAfterConfigurationFailed(InstanceConfiguration configuration) {
+			Logger.Fatal("Unable to configure instance \"{Name}\" (GUID {Guid}), shutting down.", configuration.InstanceName, configuration.InstanceGuid);
+			shutdownTokenSource.Cancel();
+		}
+		
+		foreach (var configureInstanceMessage in message.InitialInstanceConfigurations) {
+			var result = await HandleConfigureInstance(configureInstanceMessage, alwaysReportStatus: true);
+			if (!result.Is(ConfigureInstanceResult.Success)) {
+				ShutdownAfterConfigurationFailed(configureInstanceMessage.Configuration);
+				return NoReply.Instance;
+			}
+		}
+
+		await ServerMessaging.Send(new AdvertiseJavaRuntimesMessage(agent.JavaRuntimeRepository.All));
+		await agent.InstanceSessionManager.RefreshAgentStatus();
+		
+		return NoReply.Instance;
+	}
+
+	public Task<NoReply> 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);
+
+		return Task.FromResult(NoReply.Instance);
+	}
+	
+	private Task<InstanceActionResult<ConfigureInstanceResult>> HandleConfigureInstance(ConfigureInstanceMessage message, bool alwaysReportStatus) {
+		return agent.InstanceSessionManager.Configure(message.Configuration, message.LaunchProperties, message.LaunchNow, alwaysReportStatus);
+	}
+	
+	public async Task<InstanceActionResult<ConfigureInstanceResult>> HandleConfigureInstance(ConfigureInstanceMessage message) {
+		return await HandleConfigureInstance(message, alwaysReportStatus: false);
+	}
+
+	public async Task<InstanceActionResult<LaunchInstanceResult>> HandleLaunchInstance(LaunchInstanceMessage message) {
+		return await agent.InstanceSessionManager.Launch(message.InstanceGuid);
+	}
+
+	public async Task<InstanceActionResult<StopInstanceResult>> HandleStopInstance(StopInstanceMessage message) {
+		return await agent.InstanceSessionManager.Stop(message.InstanceGuid, message.StopStrategy);
+	}
+
+	public async Task<InstanceActionResult<SendCommandToInstanceResult>> HandleSendCommandToInstance(SendCommandToInstanceMessage message) {
+		return await agent.InstanceSessionManager.SendCommand(message.InstanceGuid, message.Command);
+	}
+
+	public Task<NoReply> HandleReply(ReplyMessage message) {
+		connection.Receive(message);
+		return Task.FromResult(NoReply.Instance);
+	}
+}

Agent/Phantom.Agent/AgentKey.cs

@@ -1,8 +1,8 @@
 using NetMQ;
-using Phantom.Common.Data;
+using Phantom.Common.Data.Agent;
+using Phantom.Common.Logging;
 using Phantom.Utils.Cryptography;
 using Phantom.Utils.IO;
-using Phantom.Utils.Logging;
 using Serilog;
 
 namespace Phantom.Agent;

Agent/Phantom.Agent/GuidFile.cs

@@ -1,9 +1,9 @@
 using System.Text;
+using Phantom.Common.Logging;
 using Phantom.Utils.IO;
-using Phantom.Utils.Logging;
 using Serilog;
 
-namespace Phantom.Agent;
+namespace Phantom.Agent; 
 
 static class GuidFile {
 	private static ILogger Logger { get; } = PhantomLogger.Create(nameof(GuidFile));

Agent/Phantom.Agent/Program.cs

@@ -1,30 +1,26 @@
 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;
+using Phantom.Common.Logging;
 using Phantom.Common.Messages.Agent;
-using Phantom.Common.Messages.Agent.ToController;
-using Phantom.Utils.Actor;
-using Phantom.Utils.Logging;
 using Phantom.Utils.Rpc;
-using Phantom.Utils.Rpc.Sockets;
 using Phantom.Utils.Runtime;
+using Phantom.Utils.Tasks;
 
 const int ProtocolVersion = 1;
 
 var shutdownCancellationTokenSource = new CancellationTokenSource();
 var shutdownCancellationToken = shutdownCancellationTokenSource.Token;
 
-ProgramCulture.UseInvariantCulture();
-ThreadPool.SetMinThreads(workerThreads: 2, completionPortThreads: 1);
-
 PosixSignals.RegisterCancellation(shutdownCancellationTokenSource, static () => {
 	PhantomLogger.Root.InformationHeading("Stopping Phantom Panel agent...");
 });
 
+ThreadPool.SetMinThreads(workerThreads: 2, completionPortThreads: 1);
+
 try {
 	var fullVersion = AssemblyAttributes.GetFullVersion(Assembly.GetExecutingAssembly());
 
@@ -50,20 +46,19 @@ try {
 
 	var (controllerCertificate, agentToken) = agentKey.Value;
 	var agentInfo = new AgentInfo(agentGuid.Value, agentName, ProtocolVersion, fullVersion, maxInstances, maxMemory, allowedServerPorts, allowedRconPorts);
-	
+	var agentServices = new AgentServices(agentInfo, folders, new AgentServiceConfiguration(maxConcurrentBackupCompressionTasks));
-	PhantomLogger.Root.InformationHeading("Launching Phantom Panel agent...");
+
-	
+	MessageListener MessageListenerFactory(RpcConnectionToServer<IMessageToControllerListener> connection) {
-	var rpcConfiguration = new RpcConfiguration("Agent", controllerHost, controllerPort, controllerCertificate);
+		return new MessageListener(connection, agentServices, shutdownCancellationTokenSource);
-	var rpcSocket = RpcClientSocket.Connect(rpcConfiguration, AgentMessageRegistries.Definitions, new RegisterAgentMessage(agentToken, agentInfo));
+	}
+
+	PhantomLogger.Root.InformationHeading("Launching Phantom Panel agent...");
 
-	var agentServices = new AgentServices(agentInfo, folders, new AgentServiceConfiguration(maxConcurrentBackupCompressionTasks), new ControllerConnection(rpcSocket.Connection));
 	await agentServices.Initialize();
 
-	var rpcMessageHandlerInit = new ControllerMessageHandlerActor.Init(rpcSocket.Connection, agentServices, shutdownCancellationTokenSource);
-	var rpcMessageHandlerActor = agentServices.ActorSystem.ActorOf(ControllerMessageHandlerActor.Factory(rpcMessageHandlerInit), "ControllerMessageHandler");
-	
 	var rpcDisconnectSemaphore = new SemaphoreSlim(0, 1);
-	var rpcTask = RpcClientRuntime.Launch(rpcSocket, rpcMessageHandlerActor, rpcDisconnectSemaphore, shutdownCancellationToken);
+	var rpcConfiguration = new RpcConfiguration(PhantomLogger.Create("Rpc"), PhantomLogger.Create<TaskManager>("Rpc"), controllerHost, controllerPort, controllerCertificate);
+	var rpcTask = RpcLauncher.Launch(rpcConfiguration, agentToken, agentInfo, MessageListenerFactory, rpcDisconnectSemaphore, shutdownCancellationToken);
 	try {
 		await rpcTask.WaitAsync(shutdownCancellationToken);
 	} finally {
@@ -73,8 +68,6 @@ try {
 		rpcDisconnectSemaphore.Release();
 		await rpcTask;
 		rpcDisconnectSemaphore.Dispose();
-		
-		NetMQConfig.Cleanup();
 	}
 
 	return 0;

Agent/Phantom.Agent/Variables.cs

@@ -1,6 +1,6 @@
 using Phantom.Agent.Minecraft.Java;
 using Phantom.Common.Data;
-using Phantom.Utils.Logging;
+using Phantom.Common.Logging;
 using Phantom.Utils.Runtime;
 
 namespace Phantom.Agent;

Common/Phantom.Common.Data.Tests/AllowedPortsTests.cs

@@ -1,6 +1,6 @@
 using NUnit.Framework;
 
-namespace Phantom.Common.Data.Tests;
+namespace Phantom.Common.Data.Tests; 
 
 [TestFixture]
 public sealed class AllowedPortsTests {

Common/Phantom.Common.Data.Web/Agent/Agent.cs

@@ -1,15 +0,0 @@
-using MemoryPack;
-using Phantom.Common.Data.Agent;
-
-namespace Phantom.Common.Data.Web.Agent;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record Agent(
-	[property: MemoryPackOrder(0)] Guid AgentGuid,
-	[property: MemoryPackOrder(1)] AgentConfiguration Configuration,
-	[property: MemoryPackOrder(2)] AgentStats? Stats,
-	[property: MemoryPackOrder(3)] IAgentConnectionStatus ConnectionStatus
-) {
-	[MemoryPackIgnore]
-	public RamAllocationUnits? AvailableMemory => Configuration.MaxMemory - Stats?.RunningInstanceMemory;
-}

Common/Phantom.Common.Data.Web/Agent/AgentConfiguration.cs

@@ -1,19 +0,0 @@
-using MemoryPack;
-using Phantom.Common.Data.Agent;
-
-namespace Phantom.Common.Data.Web.Agent;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record AgentConfiguration(
-	[property: MemoryPackOrder(0)] string AgentName,
-	[property: MemoryPackOrder(1)] ushort ProtocolVersion,
-	[property: MemoryPackOrder(2)] string BuildVersion,
-	[property: MemoryPackOrder(3)] ushort MaxInstances,
-	[property: MemoryPackOrder(4)] RamAllocationUnits MaxMemory,
-	[property: MemoryPackOrder(5)] AllowedPorts? AllowedServerPorts = null,
-	[property: MemoryPackOrder(6)] AllowedPorts? AllowedRconPorts = null
-) {
-	public static AgentConfiguration From(AgentInfo agentInfo) {
-		return new AgentConfiguration(agentInfo.AgentName, agentInfo.ProtocolVersion, agentInfo.BuildVersion, agentInfo.MaxInstances, agentInfo.MaxMemory, agentInfo.AllowedServerPorts, agentInfo.AllowedRconPorts);
-	}
-}

Common/Phantom.Common.Data.Web/Agent/IAgentConnectionStatus.cs

@@ -1,27 +0,0 @@
-using MemoryPack;
-
-namespace Phantom.Common.Data.Web.Agent;
-
-[MemoryPackable]
-[MemoryPackUnion(0, typeof(AgentIsOffline))]
-[MemoryPackUnion(1, typeof(AgentIsDisconnected))]
-[MemoryPackUnion(2, typeof(AgentIsOnline))]
-public partial interface IAgentConnectionStatus {}
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record AgentIsOffline : IAgentConnectionStatus;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record AgentIsDisconnected([property: MemoryPackOrder(0)] DateTimeOffset LastPingTime) : IAgentConnectionStatus;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record AgentIsOnline : IAgentConnectionStatus;
-
-public static class AgentConnectionStatus {
-	public static readonly IAgentConnectionStatus Offline = new AgentIsOffline();
-	public static readonly IAgentConnectionStatus Online = new AgentIsOnline();
-
-	public static IAgentConnectionStatus Disconnected(DateTimeOffset lastPingTime) {
-		return new AgentIsDisconnected(lastPingTime);
-	}
-}

Common/Phantom.Common.Data.Web/Audit/AuditLogEventType.cs

@@ -1,4 +1,4 @@
-namespace Phantom.Common.Data.Web.AuditLog;
+namespace Phantom.Controller.Database.Enums;
 
 public enum AuditLogEventType {
 	AdministratorUserCreated,
@@ -16,7 +16,7 @@ public enum AuditLogEventType {
 	InstanceCommandExecuted
 }
 
-public static class AuditLogEventTypeExtensions {
+static class AuditLogEventTypeExtensions {
 	private static readonly Dictionary<AuditLogEventType, AuditLogSubjectType> SubjectTypes = new () {
 		{ AuditLogEventType.AdministratorUserCreated,  AuditLogSubjectType.User },
 		{ AuditLogEventType.AdministratorUserModified, AuditLogSubjectType.User },
@@ -41,7 +41,7 @@ public static class AuditLogEventTypeExtensions {
 		}
 	}
 
-	public static AuditLogSubjectType GetSubjectType(this AuditLogEventType type) {
+	internal static AuditLogSubjectType GetSubjectType(this AuditLogEventType type) {
 		return SubjectTypes[type];
 	}
 }

Common/Phantom.Common.Data.Web/Audit/AuditLogItem.cs

@@ -0,0 +1,6 @@
+using System.Text.Json;
+using Phantom.Controller.Database.Enums;
+
+namespace Phantom.Controller.Services.Audit; 
+
+public sealed record AuditLogItem(DateTime UtcTime, Guid? UserGuid, string? UserName, AuditLogEventType EventType, AuditLogSubjectType SubjectType, string? SubjectId, JsonDocument? Data);

Common/Phantom.Common.Data.Web/Audit/AuditLogSubjectType.cs

@@ -1,4 +1,4 @@
-namespace Phantom.Common.Data.Web.AuditLog;
+namespace Phantom.Controller.Database.Enums; 
 
 public enum AuditLogSubjectType {
 	User,

Common/Phantom.Common.Data.Web/AuditLog/AuditLogItem.cs

@@ -1,14 +0,0 @@
-using MemoryPack;
-
-namespace Phantom.Common.Data.Web.AuditLog;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record AuditLogItem(
-	[property: MemoryPackOrder(0)] DateTime UtcTime,
-	[property: MemoryPackOrder(1)] Guid? UserGuid,
-	[property: MemoryPackOrder(2)] string? UserName,
-	[property: MemoryPackOrder(3)] AuditLogEventType EventType,
-	[property: MemoryPackOrder(4)] AuditLogSubjectType SubjectType,
-	[property: MemoryPackOrder(5)] string? SubjectId,
-	[property: MemoryPackOrder(6)] string? JsonData
-);

Common/Phantom.Common.Data.Web/EventLog/EventLogItem.cs

@@ -1,13 +0,0 @@
-using MemoryPack;
-
-namespace Phantom.Common.Data.Web.EventLog;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record EventLogItem(
-	[property: MemoryPackOrder(0)] DateTime UtcTime,
-	[property: MemoryPackOrder(1)] Guid? AgentGuid,
-	[property: MemoryPackOrder(2)] EventLogEventType EventType,
-	[property: MemoryPackOrder(3)] EventLogSubjectType SubjectType,
-	[property: MemoryPackOrder(4)] string SubjectId,
-	[property: MemoryPackOrder(5)] string? JsonData
-);

Common/Phantom.Common.Data.Web/EventLog/EventLogSubjectType.cs

@@ -1,5 +0,0 @@
-namespace Phantom.Common.Data.Web.EventLog;
-
-public enum EventLogSubjectType {
-	Instance
-}

Common/Phantom.Common.Data.Web/Instance/CreateOrUpdateInstanceResult.cs

@@ -1,23 +0,0 @@
-namespace Phantom.Common.Data.Web.Instance;
-
-public enum CreateOrUpdateInstanceResult : byte {
-	UnknownError,
-	Success,
-	InstanceNameMustNotBeEmpty,
-	InstanceMemoryMustNotBeZero,
-	MinecraftVersionDownloadInfoNotFound,
-	AgentNotFound
-}
-
-public static class CreateOrUpdateInstanceResultExtensions {
-	public static string ToSentence(this CreateOrUpdateInstanceResult reason) {
-		return reason switch {
-			CreateOrUpdateInstanceResult.Success                              => "Success.",
-			CreateOrUpdateInstanceResult.InstanceNameMustNotBeEmpty           => "Instance name must not be empty.",
-			CreateOrUpdateInstanceResult.InstanceMemoryMustNotBeZero          => "Memory must not be 0 MB.",
-			CreateOrUpdateInstanceResult.MinecraftVersionDownloadInfoNotFound => "Could not find download information for the selected Minecraft version.",
-			CreateOrUpdateInstanceResult.AgentNotFound                        => "Agent not found.",
-			_                                                                 => "Unknown error."
-		};
-	}
-}

Common/Phantom.Common.Data.Web/Instance/Instance.cs

@@ -1,17 +0,0 @@
-using MemoryPack;
-using Phantom.Common.Data.Instance;
-
-namespace Phantom.Common.Data.Web.Instance;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record Instance(
-	[property: MemoryPackOrder(0)] Guid InstanceGuid,
-	[property: MemoryPackOrder(1)] InstanceConfiguration Configuration,
-	[property: MemoryPackOrder(2)] IInstanceStatus Status,
-	[property: MemoryPackOrder(3)] InstancePlayerCounts? PlayerCounts,
-	[property: MemoryPackOrder(4)] bool LaunchAutomatically
-) {
-	public static Instance Offline(Guid instanceGuid, InstanceConfiguration configuration, bool launchAutomatically = false) {
-		return new Instance(instanceGuid, configuration, InstanceStatus.Offline, PlayerCounts: null, launchAutomatically);
-	}
-}

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

@@ -10,8 +10,4 @@
     <PackageReference Include="MemoryPack" />
   </ItemGroup>
   
-  <ItemGroup>
-    <ProjectReference Include="..\Phantom.Common.Data\Phantom.Common.Data.csproj" />
-  </ItemGroup>
-  
 </Project>

Common/Phantom.Common.Data.Web/Users/AddRoleError.cs

@@ -1,4 +1,4 @@
-namespace Phantom.Common.Data.Web.Users;
+namespace Phantom.Controller.Services.Users.Roles; 
 
 public enum AddRoleError : byte {
 	NameIsEmpty,

Common/Phantom.Common.Data.Web/Users/AddUserError.cs

@@ -1,28 +1,25 @@
 using System.Collections.Immutable;
 using MemoryPack;
-using Phantom.Common.Data.Web.Users.AddUserErrors;
 
-namespace Phantom.Common.Data.Web.Users {
+namespace Phantom.Common.Data.Web.Users;
-	[MemoryPackable]
+
-	[MemoryPackUnion(0, typeof(NameIsInvalid))]
+[MemoryPackable]
-	[MemoryPackUnion(1, typeof(PasswordIsInvalid))]
+[MemoryPackUnion(0, typeof(NameIsInvalid))]
-	[MemoryPackUnion(2, typeof(NameAlreadyExists))]
+[MemoryPackUnion(1, typeof(PasswordIsInvalid))]
-	[MemoryPackUnion(3, typeof(UnknownError))]
+[MemoryPackUnion(2, typeof(NameAlreadyExists))]
-	public abstract partial record AddUserError {
+[MemoryPackUnion(3, typeof(UnknownError))]
-		internal AddUserError() {}
+public abstract record AddUserError {
-	}
+	private AddUserError() {}
-}
+
-
+	[MemoryPackable(GenerateType.VersionTolerant)]
-namespace Phantom.Common.Data.Web.Users.AddUserErrors {
+	public sealed record NameIsInvalid([property: MemoryPackOrder(0)] UsernameRequirementViolation Violation) : AddUserError;
-	[MemoryPackable(GenerateType.VersionTolerant)]
+
-	public sealed partial record NameIsInvalid([property: MemoryPackOrder(0)] UsernameRequirementViolation Violation) : AddUserError;
+	[MemoryPackable(GenerateType.VersionTolerant)]
-
+	public sealed record PasswordIsInvalid([property: MemoryPackOrder(0)] ImmutableArray<PasswordRequirementViolation> Violations) : AddUserError;
-	[MemoryPackable(GenerateType.VersionTolerant)]
+
-	public sealed partial record PasswordIsInvalid([property: MemoryPackOrder(0)] ImmutableArray<PasswordRequirementViolation> Violations) : AddUserError;
+	[MemoryPackable(GenerateType.VersionTolerant)]
-
+	public sealed record NameAlreadyExists : AddUserError;
-	[MemoryPackable(GenerateType.VersionTolerant)]
+
-	public sealed partial record NameAlreadyExists : AddUserError;
+	[MemoryPackable(GenerateType.VersionTolerant)]
-
+	public sealed record UnknownError : AddUserError;
-	[MemoryPackable(GenerateType.VersionTolerant)]
-	public sealed partial record UnknownError : AddUserError;
 }

Common/Phantom.Common.Data.Web/Users/AuthenticatedUserInfo.cs

@@ -1,24 +0,0 @@
-using System.Collections.Immutable;
-using MemoryPack;
-
-namespace Phantom.Common.Data.Web.Users;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record AuthenticatedUserInfo(
-	[property: MemoryPackOrder(0)] Guid Guid,
-	[property: MemoryPackOrder(1)] string Name,
-	[property: MemoryPackOrder(2)] PermissionSet Permissions,
-	[property: MemoryPackOrder(3)] ImmutableHashSet<Guid> ManagedAgentGuids
-) {
-	public bool CheckPermission(Permission permission) {
-		return Permissions.Check(permission);
-	}
-
-	public bool HasAccessToAgent(Guid agentGuid) {
-		return ManagedAgentGuids.Contains(agentGuid) || Permissions.Check(Permission.ManageAllAgents);
-	}
-
-	public ImmutableHashSet<Guid> FilterAccessibleAgentGuids(ImmutableHashSet<Guid> agentGuids) {
-		return Permissions.Check(Permission.ManageAllAgents) ? agentGuids : agentGuids.Intersect(ManagedAgentGuids);
-	}
-}

Common/Phantom.Common.Data.Web/Users/ChangeUserRolesResult.cs

@@ -1,10 +0,0 @@
-using System.Collections.Immutable;
-using MemoryPack;
-
-namespace Phantom.Common.Data.Web.Users; 
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record ChangeUserRolesResult(
-	[property: MemoryPackOrder(0)] ImmutableHashSet<Guid> AddedToRoleGuids,
-	[property: MemoryPackOrder(1)] ImmutableHashSet<Guid> RemovedFromRoleGuids
-);

Common/Phantom.Common.Data.Web/Users/CreateOrUpdateAdministratorUserResult.cs

@@ -1,19 +1,16 @@
 using MemoryPack;
-using Phantom.Common.Data.Web.Users.CreateOrUpdateAdministratorUserResults;
 
-namespace Phantom.Common.Data.Web.Users {
+namespace Phantom.Common.Data.Web.Users;
-	[MemoryPackable]
+
-	[MemoryPackUnion(0, typeof(Success))]
+[MemoryPackable]
-	[MemoryPackUnion(1, typeof(CreationFailed))]
+[MemoryPackUnion(0, typeof(Success))]
-	[MemoryPackUnion(2, typeof(UpdatingFailed))]
+[MemoryPackUnion(1, typeof(CreationFailed))]
-	[MemoryPackUnion(3, typeof(AddingToRoleFailed))]
+[MemoryPackUnion(2, typeof(UpdatingFailed))]
-	[MemoryPackUnion(4, typeof(UnknownError))]
+[MemoryPackUnion(3, typeof(AddingToRoleFailed))]
-	public abstract partial record CreateOrUpdateAdministratorUserResult {
+[MemoryPackUnion(4, typeof(UnknownError))]
-		internal CreateOrUpdateAdministratorUserResult() {}
+public abstract partial record CreateOrUpdateAdministratorUserResult {
-	}
+	private CreateOrUpdateAdministratorUserResult() {}
-}
 
-namespace Phantom.Common.Data.Web.Users.CreateOrUpdateAdministratorUserResults {
 	[MemoryPackable(GenerateType.VersionTolerant)]
 	public sealed partial record Success([property: MemoryPackOrder(0)] UserInfo User) : CreateOrUpdateAdministratorUserResult;
 
@@ -22,10 +19,10 @@ namespace Phantom.Common.Data.Web.Users.CreateOrUpdateAdministratorUserResults {
 
 	[MemoryPackable(GenerateType.VersionTolerant)]
 	public sealed partial record UpdatingFailed([property: MemoryPackOrder(0)] SetUserPasswordError Error) : CreateOrUpdateAdministratorUserResult;
-
+	
 	[MemoryPackable(GenerateType.VersionTolerant)]
 	public sealed partial record AddingToRoleFailed : CreateOrUpdateAdministratorUserResult;
-
+	
 	[MemoryPackable(GenerateType.VersionTolerant)]
 	public sealed partial record UnknownError : CreateOrUpdateAdministratorUserResult;
 }

Common/Phantom.Common.Data.Web/Users/CreateUserResult.cs

@@ -1,23 +0,0 @@
-using MemoryPack;
-using Phantom.Common.Data.Web.Users.CreateUserResults;
-
-namespace Phantom.Common.Data.Web.Users {
-	[MemoryPackable]
-	[MemoryPackUnion(0, typeof(Success))]
-	[MemoryPackUnion(1, typeof(CreationFailed))]
-	[MemoryPackUnion(2, typeof(UnknownError))]
-	public abstract partial record CreateUserResult {
-		internal CreateUserResult() {}
-	}
-}
-
-namespace Phantom.Common.Data.Web.Users.CreateUserResults {
-	[MemoryPackable(GenerateType.VersionTolerant)]
-	public sealed partial record Success([property: MemoryPackOrder(0)] UserInfo User) : CreateUserResult;
-
-	[MemoryPackable(GenerateType.VersionTolerant)]
-	public sealed partial record CreationFailed([property: MemoryPackOrder(0)] AddUserError Error) : CreateUserResult;
-
-	[MemoryPackable(GenerateType.VersionTolerant)]
-	public sealed partial record UnknownError : CreateUserResult;
-}

Common/Phantom.Common.Data.Web/Users/DeleteUserResult.cs

@@ -1,4 +1,4 @@
-namespace Phantom.Common.Data.Web.Users;
+namespace Phantom.Common.Data.Web.Users; 
 
 public enum DeleteUserResult : byte {
 	Deleted,

Common/Phantom.Common.Data.Web/Users/IdentityPermissions.cs

@@ -0,0 +1,25 @@
+using System.Collections.Immutable;
+
+namespace Phantom.Common.Data.Web.Users.Permissions; 
+
+public sealed class IdentityPermissions {
+	public static IdentityPermissions None { get; } = new (ImmutableHashSet<string>.Empty);
+	
+	private readonly ImmutableHashSet<string> permissionIds;
+
+	public IdentityPermissions(ImmutableHashSet<string> permissionIdsQuery) {
+		this.permissionIds = permissionIdsQuery;
+	}
+
+	public bool Check(Permission? permission) {
+		while (permission != null) {
+			if (!permissionIds.Contains(permission.Id)) {
+				return false;
+			}
+
+			permission = permission.Parent;
+		}
+
+		return true;
+	}
+}

Common/Phantom.Common.Data.Web/Users/LogInSuccess.cs

@@ -1,10 +0,0 @@
-using System.Collections.Immutable;
-using MemoryPack;
-
-namespace Phantom.Common.Data.Web.Users;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record LogInSuccess(
-	[property: MemoryPackOrder(0)] AuthenticatedUserInfo UserInfo,
-	[property: MemoryPackOrder(1)] ImmutableArray<byte> AuthToken
-);

Common/Phantom.Common.Data.Web/Users/PasswordRequirementViolation.cs

@@ -1,27 +1,24 @@
 using MemoryPack;
-using Phantom.Common.Data.Web.Users.PasswordRequirementViolations;
 
-namespace Phantom.Common.Data.Web.Users {
+namespace Phantom.Common.Data.Web.Users;
-	[MemoryPackable]
+
-	[MemoryPackUnion(0, typeof(TooShort))]
+[MemoryPackable]
-	[MemoryPackUnion(1, typeof(MustContainLowercaseLetter))]
+[MemoryPackUnion(0, typeof(TooShort))]
-	[MemoryPackUnion(2, typeof(MustContainUppercaseLetter))]
+[MemoryPackUnion(1, typeof(LowercaseLetterRequired))]
-	[MemoryPackUnion(3, typeof(MustContainDigit))]
+[MemoryPackUnion(2, typeof(UppercaseLetterRequired))]
-	public abstract partial record PasswordRequirementViolation {
+[MemoryPackUnion(3, typeof(DigitRequired))]
-		internal PasswordRequirementViolation() {}
+public abstract record PasswordRequirementViolation {
-	}
+	private PasswordRequirementViolation() {}
-}
+
-
+	[MemoryPackable(GenerateType.VersionTolerant)]
-namespace Phantom.Common.Data.Web.Users.PasswordRequirementViolations {
+	public sealed record TooShort([property: MemoryPackOrder(0)] int MinimumLength) : PasswordRequirementViolation;
-	[MemoryPackable(GenerateType.VersionTolerant)]
+
-	public sealed partial record TooShort([property: MemoryPackOrder(0)] int MinimumLength) : PasswordRequirementViolation;
+	[MemoryPackable(GenerateType.VersionTolerant)]
-
+	public sealed record LowercaseLetterRequired : PasswordRequirementViolation;
-	[MemoryPackable(GenerateType.VersionTolerant)]
+
-	public sealed partial record MustContainLowercaseLetter : PasswordRequirementViolation;
+	[MemoryPackable(GenerateType.VersionTolerant)]
-
+	public sealed record UppercaseLetterRequired : PasswordRequirementViolation;
-	[MemoryPackable(GenerateType.VersionTolerant)]
+
-	public sealed partial record MustContainUppercaseLetter : PasswordRequirementViolation;
+	[MemoryPackable(GenerateType.VersionTolerant)]
-
+	public sealed record DigitRequired : PasswordRequirementViolation;
-	[MemoryPackable(GenerateType.VersionTolerant)]
-	public sealed partial record MustContainDigit : PasswordRequirementViolation;
 }

Common/Phantom.Common.Data.Web/Users/Permission.cs

@@ -1,4 +1,4 @@
-namespace Phantom.Common.Data.Web.Users;
+namespace Phantom.Common.Data.Web.Users.Permissions;
 
 public sealed record Permission(string Id, Permission? Parent) {
 	private static readonly List<Permission> AllPermissions = new ();
@@ -14,9 +14,6 @@ public sealed record Permission(string Id, Permission? Parent) {
 		return Register(id, this);
 	}
 
-	public const string ManageAllAgentsPolicy = "Agents.ManageAll";
-	public static readonly Permission ManageAllAgents = Register(ManageAllAgentsPolicy);
-	
 	public const string ViewInstancesPolicy = "Instances.View";
 	public static readonly Permission ViewInstances = Register(ViewInstancesPolicy);
 	

Common/Phantom.Common.Data.Web/Users/PermissionSet.cs

@@ -1,29 +0,0 @@
-using System.Collections.Immutable;
-using MemoryPack;
-
-namespace Phantom.Common.Data.Web.Users;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial class PermissionSet {
-	public static PermissionSet None { get; } = new (ImmutableHashSet<string>.Empty);
-	
-	[MemoryPackOrder(0)]
-	[MemoryPackInclude]
-	private readonly ImmutableHashSet<string> permissionIds;
-
-	public PermissionSet(ImmutableHashSet<string> permissionIds) {
-		this.permissionIds = permissionIds;
-	}
-
-	public bool Check(Permission? permission) {
-		while (permission != null) {
-			if (!permissionIds.Contains(permission.Id)) {
-				return false;
-			}
-
-			permission = permission.Parent;
-		}
-
-		return true;
-	}
-}

Common/Phantom.Common.Data.Web/Users/RoleInfo.cs

@@ -1,6 +1,6 @@
 using MemoryPack;
 
-namespace Phantom.Common.Data.Web.Users;
+namespace Phantom.Common.Data.Web.Users; 
 
 [MemoryPackable(GenerateType.VersionTolerant)]
 public sealed partial record RoleInfo(

Common/Phantom.Common.Data.Web/Users/SetUserPasswordError.cs

@@ -1,24 +1,21 @@
 using System.Collections.Immutable;
 using MemoryPack;
-using Phantom.Common.Data.Web.Users.SetUserPasswordErrors;
 
-namespace Phantom.Common.Data.Web.Users {
+namespace Phantom.Common.Data.Web.Users;
-	[MemoryPackable]
+
-	[MemoryPackUnion(0, typeof(UserNotFound))]
+[MemoryPackable]
-	[MemoryPackUnion(1, typeof(PasswordIsInvalid))]
+[MemoryPackUnion(0, typeof(UserNotFound))]
-	[MemoryPackUnion(2, typeof(UnknownError))]
+[MemoryPackUnion(1, typeof(PasswordIsInvalid))]
-	public abstract partial record SetUserPasswordError {
+[MemoryPackUnion(2, typeof(UnknownError))]
-		internal SetUserPasswordError() {}
+public abstract record SetUserPasswordError {
-	}
+	private SetUserPasswordError() {}
-}
+
-
+	[MemoryPackable(GenerateType.VersionTolerant)]
-namespace Phantom.Common.Data.Web.Users.SetUserPasswordErrors {
+	public sealed record UserNotFound : SetUserPasswordError;
-	[MemoryPackable(GenerateType.VersionTolerant)]
+
-	public sealed partial record UserNotFound : SetUserPasswordError;
+	[MemoryPackable(GenerateType.VersionTolerant)]
-
+	public sealed record PasswordIsInvalid(ImmutableArray<PasswordRequirementViolation> Violations) : SetUserPasswordError;
-	[MemoryPackable(GenerateType.VersionTolerant)]
+	
-	public sealed partial record PasswordIsInvalid([property: MemoryPackOrder(0)] ImmutableArray<PasswordRequirementViolation> Violations) : SetUserPasswordError;
+	[MemoryPackable(GenerateType.VersionTolerant)]
-
+	public sealed record UnknownError : SetUserPasswordError;
-	[MemoryPackable(GenerateType.VersionTolerant)]
-	public sealed partial record UnknownError : SetUserPasswordError;
 }

Common/Phantom.Common.Data.Web/Users/UserActionFailure.cs

@@ -1,5 +0,0 @@
-namespace Phantom.Common.Data.Web.Users;
-
-public enum UserActionFailure {
-	NotAuthorized
-}

Common/Phantom.Common.Data.Web/Users/UserInstanceActionFailure.cs

@@ -1,25 +0,0 @@
-using MemoryPack;
-using Phantom.Common.Data.Replies;
-
-namespace Phantom.Common.Data.Web.Users;
-
-[MemoryPackable]
-[MemoryPackUnion(0, typeof(OfUserActionFailure))]
-[MemoryPackUnion(1, typeof(OfInstanceActionFailure))]
-public abstract partial record UserInstanceActionFailure {
-	internal UserInstanceActionFailure() {}
-	
-	public static implicit operator UserInstanceActionFailure(UserActionFailure failure) {
-		return new OfUserActionFailure(failure);
-	}
-	
-	public static implicit operator UserInstanceActionFailure(InstanceActionFailure failure) {
-		return new OfInstanceActionFailure(failure);
-	}
-}
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record OfUserActionFailure([property: MemoryPackOrder(0)] UserActionFailure Failure) : UserInstanceActionFailure;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record OfInstanceActionFailure([property: MemoryPackOrder(0)] InstanceActionFailure Failure) : UserInstanceActionFailure;

Common/Phantom.Common.Data.Web/Users/UserPasswords.cs

@@ -1,4 +1,4 @@
-namespace Phantom.Common.Data.Web.Users;
+namespace Phantom.Common.Data.Web.Users; 
 
 public static class UserPasswords {
 	public static string Hash(string password) {

Common/Phantom.Common.Data.Web/Users/UsernameRequirementViolation.cs

@@ -1,19 +1,16 @@
 using MemoryPack;
-using Phantom.Common.Data.Web.Users.UsernameRequirementViolations;
 
-namespace Phantom.Common.Data.Web.Users {
+namespace Phantom.Common.Data.Web.Users;
-	[MemoryPackable]
-	[MemoryPackUnion(0, typeof(IsEmpty))]
-	[MemoryPackUnion(1, typeof(TooLong))]
-	public abstract partial record UsernameRequirementViolation {
-		internal UsernameRequirementViolation() {}
-	}
-}
 
-namespace Phantom.Common.Data.Web.Users.UsernameRequirementViolations {
+[MemoryPackable]
-	[MemoryPackable(GenerateType.VersionTolerant)]
+[MemoryPackUnion(0, typeof(IsEmpty))]
-	public sealed partial record IsEmpty : UsernameRequirementViolation;
+[MemoryPackUnion(1, typeof(TooLong))]
+public abstract record UsernameRequirementViolation {
+	private UsernameRequirementViolation() {}
 
 	[MemoryPackable(GenerateType.VersionTolerant)]
-	public sealed partial record TooLong([property: MemoryPackOrder(0)] int MaxLength) : UsernameRequirementViolation;
+	public sealed record IsEmpty : UsernameRequirementViolation;
+
+	[MemoryPackable(GenerateType.VersionTolerant)]
+	public sealed record TooLong(int MaxLength) : UsernameRequirementViolation;
 }

Common/Phantom.Common.Data/Agent/AgentInfo.cs

@@ -4,8 +4,8 @@ namespace Phantom.Common.Data.Agent;
 
 [MemoryPackable(GenerateType.VersionTolerant)]
 public sealed partial record AgentInfo(
-	[property: MemoryPackOrder(0)] Guid AgentGuid,
+	[property: MemoryPackOrder(0)] Guid Guid,
-	[property: MemoryPackOrder(1)] string AgentName,
+	[property: MemoryPackOrder(1)] string Name,
 	[property: MemoryPackOrder(2)] ushort ProtocolVersion,
 	[property: MemoryPackOrder(3)] string BuildVersion,
 	[property: MemoryPackOrder(4)] ushort MaxInstances,

Common/Phantom.Common.Data/Agent/AgentStats.cs

@@ -1,9 +0,0 @@
-using MemoryPack;
-
-namespace Phantom.Common.Data.Agent;
-
-[MemoryPackable(GenerateType.VersionTolerant)]
-public sealed partial record AgentStats(
-	[property: MemoryPackOrder(0)] int RunningInstanceCount,
-	[property: MemoryPackOrder(1)] RamAllocationUnits RunningInstanceMemory
-);

Common/Phantom.Common.Data/Agent/AuthToken.cs

@@ -2,7 +2,7 @@
 using System.Security.Cryptography;
 using MemoryPack;
 
-namespace Phantom.Common.Data;
+namespace Phantom.Common.Data.Agent;
 
 [MemoryPackable(GenerateType.VersionTolerant)]
 [SuppressMessage("ReSharper", "MemberCanBePrivate.Global")]
@@ -14,7 +14,9 @@ public sealed partial class AuthToken {
 	private readonly byte[] bytes;
 
 	internal AuthToken(byte[]? bytes) {
-		ArgumentNullException.ThrowIfNull(bytes);
+		if (bytes == null) {
+			throw new ArgumentNullException(nameof(bytes));
+		}
 
 		if (bytes.Length != Length) {
 			throw new ArgumentOutOfRangeException(nameof(bytes), "Invalid token length: " + bytes.Length + ". Token length must be exactly " + Length + " bytes.");

Common/Phantom.Common.Data/Agent/ConnectionCommonKey.cs

@@ -1,4 +1,4 @@
-namespace Phantom.Common.Data;
+namespace Phantom.Common.Data.Agent;
 
 public readonly record struct ConnectionCommonKey(byte[] CertificatePublicKey, AuthToken AuthToken) {
 	private const byte TokenLength = AuthToken.Length;