C#: Add Ide Connection library and server for the editor

This will be used for communicating between the Godot editor and external IDEs/editors, for things like opening files, triggering hot-reload and running the game with a debugger attached.

13 files changed, 901 insertions, 0 deletions

diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ConsoleLogger.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ConsoleLogger.cs
new file mode 100644
index 0000000000..7a2ff2ca56
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ConsoleLogger.cs
@@ -0,0 +1,33 @@
+using System;
+
+namespace GodotTools.IdeConnection
+{
+    public class ConsoleLogger : ILogger
+    {
+        public void LogDebug(string message)
+        {
+            Console.WriteLine("DEBUG: " + message);
+        }
+
+        public void LogInfo(string message)
+        {
+            Console.WriteLine("INFO: " + message);
+        }
+
+        public void LogWarning(string message)
+        {
+            Console.WriteLine("WARN: " + message);
+        }
+
+        public void LogError(string message)
+        {
+            Console.WriteLine("ERROR: " + message);
+        }
+
+        public void LogError(string message, Exception e)
+        {
+            Console.WriteLine("EXCEPTION: " + message);
+            Console.WriteLine(e);
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeBase.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeBase.cs
new file mode 100644
index 0000000000..be89638241
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeBase.cs
@@ -0,0 +1,94 @@
+using System;
+using Path = System.IO.Path;
+
+namespace GodotTools.IdeConnection
+{
+    public class GodotIdeBase : IDisposable
+    {
+        private ILogger logger;
+
+        public ILogger Logger
+        {
+            get => logger ?? (logger = new ConsoleLogger());
+            set => logger = value;
+        }
+
+        private readonly string projectMetadataDir;
+
+        protected const string MetaFileName = "ide_server_meta.txt";
+        protected string MetaFilePath => Path.Combine(projectMetadataDir, MetaFileName);
+
+        private GodotIdeConnection connection;
+        protected readonly object ConnectionLock = new object();
+
+        public bool IsDisposed { get; private set; } = false;
+
+        public bool IsConnected => connection != null && !connection.IsDisposed && connection.IsConnected;
+
+        public event Action Connected
+        {
+            add
+            {
+                if (connection != null && !connection.IsDisposed)
+                    connection.Connected += value;
+            }
+            remove
+            {
+                if (connection != null && !connection.IsDisposed)
+                    connection.Connected -= value;
+            }
+        }
+
+        protected GodotIdeConnection Connection
+        {
+            get => connection;
+            set
+            {
+                connection?.Dispose();
+                connection = value;
+            }
+        }
+
+        protected GodotIdeBase(string projectMetadataDir)
+        {
+            this.projectMetadataDir = projectMetadataDir;
+        }
+
+        protected void DisposeConnection()
+        {
+            lock (ConnectionLock)
+            {
+                connection?.Dispose();
+            }
+        }
+
+        ~GodotIdeBase()
+        {
+            Dispose(disposing: false);
+        }
+
+        public void Dispose()
+        {
+            if (IsDisposed)
+                return;
+
+            lock (ConnectionLock)
+            {
+                if (IsDisposed) // lock may not be fair
+                    return;
+                IsDisposed = true;
+            }
+
+            Dispose(disposing: true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                connection?.Dispose();
+            }
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeClient.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeClient.cs
new file mode 100644
index 0000000000..4f56a8d71b
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeClient.cs
@@ -0,0 +1,219 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Net;
+using System.Net.Sockets;
+using System.Threading;
+
+namespace GodotTools.IdeConnection
+{
+    public abstract class GodotIdeClient : GodotIdeBase
+    {
+        protected GodotIdeMetadata GodotIdeMetadata;
+
+        private readonly FileSystemWatcher fsWatcher;
+
+        protected GodotIdeClient(string projectMetadataDir) : base(projectMetadataDir)
+        {
+            messageHandlers = InitializeMessageHandlers();
+
+            // FileSystemWatcher requires an existing directory
+            if (!File.Exists(projectMetadataDir))
+                Directory.CreateDirectory(projectMetadataDir);
+
+            fsWatcher = new FileSystemWatcher(projectMetadataDir, MetaFileName);
+        }
+
+        private void OnMetaFileChanged(object sender, FileSystemEventArgs e)
+        {
+            if (IsDisposed)
+                return;
+
+            lock (ConnectionLock)
+            {
+                if (IsDisposed)
+                    return;
+
+                if (!File.Exists(MetaFilePath))
+                    return;
+
+                var metadata = ReadMetadataFile();
+
+                if (metadata != null && metadata != GodotIdeMetadata)
+                {
+                    GodotIdeMetadata = metadata.Value;
+                    ConnectToServer();
+                }
+            }
+        }
+
+        private void OnMetaFileDeleted(object sender, FileSystemEventArgs e)
+        {
+            if (IsDisposed)
+                return;
+
+            if (IsConnected)
+                DisposeConnection();
+
+            // The file may have been re-created
+
+            lock (ConnectionLock)
+            {
+                if (IsDisposed)
+                    return;
+
+                if (IsConnected || !File.Exists(MetaFilePath))
+                    return;
+
+                var metadata = ReadMetadataFile();
+
+                if (metadata != null)
+                {
+                    GodotIdeMetadata = metadata.Value;
+                    ConnectToServer();
+                }
+            }
+        }
+
+        private GodotIdeMetadata? ReadMetadataFile()
+        {
+            using (var reader = File.OpenText(MetaFilePath))
+            {
+                string portStr = reader.ReadLine();
+
+                if (portStr == null)
+                    return null;
+
+                string editorExecutablePath = reader.ReadLine();
+
+                if (editorExecutablePath == null)
+                    return null;
+
+                if (!int.TryParse(portStr, out int port))
+                    return null;
+
+                return new GodotIdeMetadata(port, editorExecutablePath);
+            }
+        }
+
+        private void ConnectToServer()
+        {
+            var tcpClient = new TcpClient();
+
+            Connection = new GodotIdeConnectionClient(tcpClient, HandleMessage);
+            Connection.Logger = Logger;
+
+            try
+            {
+                Logger.LogInfo("Connecting to Godot Ide Server");
+                
+                tcpClient.Connect(IPAddress.Loopback, GodotIdeMetadata.Port);
+
+                Logger.LogInfo("Connection open with Godot Ide Server");
+
+                var clientThread = new Thread(Connection.Start)
+                {
+                    IsBackground = true,
+                    Name = "Godot Ide Connection Client"
+                };
+                clientThread.Start();
+            }
+            catch (SocketException e)
+            {
+                if (e.SocketErrorCode == SocketError.ConnectionRefused)
+                    Logger.LogError("The connection to the Godot Ide Server was refused");
+                else
+                    throw;
+            }
+        }
+
+        public void Start()
+        {
+            Logger.LogInfo("Starting Godot Ide Client");
+            
+            fsWatcher.Changed += OnMetaFileChanged;
+            fsWatcher.Deleted += OnMetaFileDeleted;
+            fsWatcher.EnableRaisingEvents = true;
+
+            lock (ConnectionLock)
+            {
+                if (IsDisposed)
+                    return;
+
+                if (!File.Exists(MetaFilePath))
+                {
+                    Logger.LogInfo("There is no Godot Ide Server running");
+                    return;
+                }
+
+                var metadata = ReadMetadataFile();
+
+                if (metadata != null)
+                {
+                    GodotIdeMetadata = metadata.Value;
+                    ConnectToServer();
+                }
+                else
+                {
+                    Logger.LogError("Failed to read Godot Ide metadata file");
+                }
+            }
+        }
+
+        public bool WriteMessage(Message message)
+        {
+            return Connection.WriteMessage(message);
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+
+            if (disposing)
+            {
+                fsWatcher?.Dispose();
+            }
+        }
+
+        protected virtual bool HandleMessage(Message message)
+        {
+            if (messageHandlers.TryGetValue(message.Id, out var action))
+            {
+                action(message.Arguments);
+                return true;
+            }
+
+            return false;
+        }
+
+        private readonly Dictionary<string, Action<string[]>> messageHandlers;
+
+        private Dictionary<string, Action<string[]>> InitializeMessageHandlers()
+        {
+            return new Dictionary<string, Action<string[]>>
+            {
+                ["OpenFile"] = args =>
+                {
+                    switch (args.Length)
+                    {
+                        case 1:
+                            OpenFile(file: args[0]);
+                            return;
+                        case 2:
+                            OpenFile(file: args[0], line: int.Parse(args[1]));
+                            return;
+                        case 3:
+                            OpenFile(file: args[0], line: int.Parse(args[1]), column: int.Parse(args[2]));
+                            return;
+                        default:
+                            throw new ArgumentException();
+                    }
+                }
+            };
+        }
+
+        protected abstract void OpenFile(string file);
+        protected abstract void OpenFile(string file, int line);
+        protected abstract void OpenFile(string file, int line, int column);
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnection.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnection.cs
new file mode 100644
index 0000000000..e7e81f175e
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnection.cs
@@ -0,0 +1,207 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Net.Sockets;
+using System.Text;
+
+namespace GodotTools.IdeConnection
+{
+    public abstract class GodotIdeConnection : IDisposable
+    {
+        protected const string Version = "1.0";
+
+        protected static readonly string ClientHandshake = $"Godot Ide Client Version {Version}";
+        protected static readonly string ServerHandshake = $"Godot Ide Server Version {Version}";
+
+        private const int ClientWriteTimeout = 8000;
+        private readonly TcpClient tcpClient;
+
+        private TextReader clientReader;
+        private TextWriter clientWriter;
+
+        private readonly object writeLock = new object();
+
+        private readonly Func<Message, bool> messageHandler;
+
+        public event Action Connected;
+
+        private ILogger logger;
+
+        public ILogger Logger
+        {
+            get => logger ?? (logger = new ConsoleLogger());
+            set => logger = value;
+        }
+
+        public bool IsDisposed { get; private set; } = false;
+
+        public bool IsConnected => tcpClient.Client != null && tcpClient.Client.Connected;
+
+        protected GodotIdeConnection(TcpClient tcpClient, Func<Message, bool> messageHandler)
+        {
+            this.tcpClient = tcpClient;
+            this.messageHandler = messageHandler;
+        }
+
+        public void Start()
+        {
+            try
+            {
+                if (!StartConnection())
+                    return;
+
+                string messageLine;
+                while ((messageLine = ReadLine()) != null)
+                {
+                    if (!MessageParser.TryParse(messageLine, out Message msg))
+                    {
+                        Logger.LogError($"Received message with invalid format: {messageLine}");
+                        continue;
+                    }
+
+                    Logger.LogDebug($"Received message: {msg}");
+
+                    if (msg.Id == "close")
+                    {
+                        Logger.LogInfo("Closing connection");
+                        return;
+                    }
+
+                    try
+                    {
+                        try
+                        {
+                            Debug.Assert(messageHandler != null);
+
+                            if (!messageHandler(msg))
+                                Logger.LogError($"Received unknown message: {msg}");
+                        }
+                        catch (Exception e)
+                        {
+                            Logger.LogError($"Message handler for '{msg}' failed with exception", e);
+                        }
+                    }
+                    catch (Exception e)
+                    {
+                        Logger.LogError($"Exception thrown from message handler. Message: {msg}", e);
+                    }
+                }
+            }
+            catch (Exception e)
+            {
+                Logger.LogError($"Unhandled exception in the Godot Ide Connection thread", e);
+            }
+            finally
+            {
+                Dispose();
+            }
+        }
+
+        private bool StartConnection()
+        {
+            NetworkStream clientStream = tcpClient.GetStream();
+
+            clientReader = new StreamReader(clientStream, Encoding.UTF8);
+
+            lock (writeLock)
+                clientWriter = new StreamWriter(clientStream, Encoding.UTF8);
+
+            clientStream.WriteTimeout = ClientWriteTimeout;
+
+            if (!WriteHandshake())
+            {
+                Logger.LogError("Could not write handshake");
+                return false;
+            }
+
+            if (!IsValidResponseHandshake(ReadLine()))
+            {
+                Logger.LogError("Received invalid handshake");
+                return false;
+            }
+
+            Connected?.Invoke();
+
+            Logger.LogInfo("Godot Ide connection started");
+
+            return true;
+        }
+
+        private string ReadLine()
+        {
+            try
+            {
+                return clientReader?.ReadLine();
+            }
+            catch (Exception e)
+            {
+                if (IsDisposed)
+                {
+                    var se = e as SocketException ?? e.InnerException as SocketException;
+                    if (se != null && se.SocketErrorCode == SocketError.Interrupted)
+                        return null;
+                }
+
+                throw;
+            }
+        }
+
+        public bool WriteMessage(Message message)
+        {
+            Logger.LogDebug($"Sending message {message}");
+            
+            var messageComposer = new MessageComposer();
+
+            messageComposer.AddArgument(message.Id);
+            foreach (string argument in message.Arguments)
+                messageComposer.AddArgument(argument);
+
+            return WriteLine(messageComposer.ToString());
+        }
+
+        protected bool WriteLine(string text)
+        {
+            if (clientWriter == null || IsDisposed || !IsConnected)
+                return false;
+
+            lock (writeLock)
+            {
+                try
+                {
+                    clientWriter.WriteLine(text);
+                    clientWriter.Flush();
+                }
+                catch (Exception e)
+                {
+                    if (!IsDisposed)
+                    {
+                        var se = e as SocketException ?? e.InnerException as SocketException;
+                        if (se != null && se.SocketErrorCode == SocketError.Shutdown)
+                            Logger.LogInfo("Client disconnected ungracefully");
+                        else
+                            Logger.LogError("Exception thrown when trying to write to client", e);
+
+                        Dispose();
+                    }
+                }
+            }
+
+            return true;
+        }
+
+        protected abstract bool WriteHandshake();
+        protected abstract bool IsValidResponseHandshake(string handshakeLine);
+
+        public void Dispose()
+        {
+            if (IsDisposed)
+                return;
+
+            IsDisposed = true;
+
+            clientReader?.Dispose();
+            clientWriter?.Dispose();
+            ((IDisposable) tcpClient)?.Dispose();
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionClient.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionClient.cs
new file mode 100644
index 0000000000..1b11a14358
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionClient.cs
@@ -0,0 +1,24 @@
+using System;
+using System.Net.Sockets;
+using System.Threading.Tasks;
+
+namespace GodotTools.IdeConnection
+{
+    public class GodotIdeConnectionClient : GodotIdeConnection
+    {
+        public GodotIdeConnectionClient(TcpClient tcpClient, Func<Message, bool> messageHandler)
+            : base(tcpClient, messageHandler)
+        {
+        }
+
+        protected override bool WriteHandshake()
+        {
+            return WriteLine(ClientHandshake);
+        }
+
+        protected override bool IsValidResponseHandshake(string handshakeLine)
+        {
+            return handshakeLine == ServerHandshake;
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionServer.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionServer.cs
new file mode 100644
index 0000000000..aa98dc7ca3
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeConnectionServer.cs
@@ -0,0 +1,24 @@
+using System;
+using System.Net.Sockets;
+using System.Threading.Tasks;
+
+namespace GodotTools.IdeConnection
+{
+    public class GodotIdeConnectionServer : GodotIdeConnection
+    {
+        public GodotIdeConnectionServer(TcpClient tcpClient, Func<Message, bool> messageHandler)
+            : base(tcpClient, messageHandler)
+        {
+        }
+
+        protected override bool WriteHandshake()
+        {
+            return WriteLine(ServerHandshake);
+        }
+
+        protected override bool IsValidResponseHandshake(string handshakeLine)
+        {
+            return handshakeLine == ClientHandshake;
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeMetadata.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeMetadata.cs
new file mode 100644
index 0000000000..d16daba0e2
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotIdeMetadata.cs
@@ -0,0 +1,45 @@
+namespace GodotTools.IdeConnection
+{
+    public struct GodotIdeMetadata
+    {
+        public int Port { get; }
+        public string EditorExecutablePath { get; }
+
+        public GodotIdeMetadata(int port, string editorExecutablePath)
+        {
+            Port = port;
+            EditorExecutablePath = editorExecutablePath;
+        }
+
+        public static bool operator ==(GodotIdeMetadata a, GodotIdeMetadata b)
+        {
+            return a.Port == b.Port && a.EditorExecutablePath == b.EditorExecutablePath;
+        }
+
+        public static bool operator !=(GodotIdeMetadata a, GodotIdeMetadata b)
+        {
+            return !(a == b);
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj is GodotIdeMetadata metadata)
+                return metadata == this;
+
+            return false;
+        }
+
+        public bool Equals(GodotIdeMetadata other)
+        {
+            return Port == other.Port && EditorExecutablePath == other.EditorExecutablePath;
+        }
+
+        public override int GetHashCode()
+        {
+            unchecked
+            {
+                return (Port * 397) ^ (EditorExecutablePath != null ? EditorExecutablePath.GetHashCode() : 0);
+            }
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotTools.IdeConnection.csproj b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotTools.IdeConnection.csproj
new file mode 100644
index 0000000000..84c08251ab
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/GodotTools.IdeConnection.csproj
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{92600954-25F0-4291-8E11-1FEE9FC4BE20}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>GodotTools.IdeConnection</RootNamespace>
+    <AssemblyName>GodotTools.IdeConnection</AssemblyName>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>portable</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>portable</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="ConsoleLogger.cs" />
+    <Compile Include="GodotIdeMetadata.cs" />
+    <Compile Include="GodotIdeBase.cs" />
+    <Compile Include="GodotIdeClient.cs" />
+    <Compile Include="GodotIdeConnection.cs" />
+    <Compile Include="GodotIdeConnectionClient.cs" />
+    <Compile Include="GodotIdeConnectionServer.cs" />
+    <Compile Include="ILogger.cs" />
+    <Compile Include="Message.cs" />
+    <Compile Include="MessageComposer.cs" />
+    <Compile Include="MessageParser.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>
\ No newline at end of file
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ILogger.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ILogger.cs
new file mode 100644
index 0000000000..614bb30271
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/ILogger.cs
@@ -0,0 +1,13 @@
+using System;
+
+namespace GodotTools.IdeConnection
+{
+    public interface ILogger
+    {
+        void LogDebug(string message);
+        void LogInfo(string message);
+        void LogWarning(string message);
+        void LogError(string message);
+        void LogError(string message, Exception e);
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Message.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Message.cs
new file mode 100644
index 0000000000..f24d324ae3
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Message.cs
@@ -0,0 +1,21 @@
+using System.Linq;
+
+namespace GodotTools.IdeConnection
+{
+    public struct Message
+    {
+        public string Id { get; set; }
+        public string[] Arguments { get; set; }
+
+        public Message(string id, params string[] arguments)
+        {
+            Id = id;
+            Arguments = arguments;
+        }
+
+        public override string ToString()
+        {
+            return $"(Id: '{Id}', Arguments: '{string.Join(",", Arguments)}')";
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageComposer.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageComposer.cs
new file mode 100644
index 0000000000..9e4cd6ec1a
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageComposer.cs
@@ -0,0 +1,46 @@
+using System.Linq;
+using System.Text;
+
+namespace GodotTools.IdeConnection
+{
+    public class MessageComposer
+    {
+        private readonly StringBuilder stringBuilder = new StringBuilder();
+
+        private static readonly char[] CharsToEscape = { '\\', '"' };
+
+        public void AddArgument(string argument)
+        {
+            AddArgument(argument, quoted: argument.Contains(","));
+        }
+
+        public void AddArgument(string argument, bool quoted)
+        {
+            if (stringBuilder.Length > 0)
+                stringBuilder.Append(',');
+
+            if (quoted)
+            {
+                stringBuilder.Append('"');
+                
+                foreach (char @char in argument)
+                {
+                    if (CharsToEscape.Contains(@char))
+                        stringBuilder.Append('\\');
+                    stringBuilder.Append(@char);
+                }
+                
+                stringBuilder.Append('"');
+            }
+            else
+            {
+                stringBuilder.Append(argument);
+            }
+        }
+
+        public override string ToString()
+        {
+            return stringBuilder.ToString();
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageParser.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageParser.cs
new file mode 100644
index 0000000000..ed691e481f
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/MessageParser.cs
@@ -0,0 +1,88 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace GodotTools.IdeConnection
+{
+    public static class MessageParser
+    {
+        public static bool TryParse(string messageLine, out Message message)
+        {
+            var arguments = new List<string>();
+            var stringBuilder = new StringBuilder();
+
+            bool expectingArgument = true;
+
+            for (int i = 0; i < messageLine.Length; i++)
+            {
+                char @char = messageLine[i];
+
+                if (@char == ',')
+                {
+                    if (expectingArgument)
+                        arguments.Add(string.Empty);
+
+                    expectingArgument = true;
+                    continue;
+                }
+
+                bool quoted = false;
+
+                if (messageLine[i] == '"')
+                {
+                    quoted = true;
+                    i++;
+                }
+
+                while (i < messageLine.Length)
+                {
+                    @char = messageLine[i];
+                    
+                    if (quoted && @char == '"')
+                    {
+                        i++;
+                        break;
+                    }
+
+                    if (@char == '\\')
+                    {
+                        i++;
+                        if (i < messageLine.Length)
+                            break;
+
+                        stringBuilder.Append(messageLine[i]);
+                    }
+                    else if (!quoted && @char == ',')
+                    {
+                        break; // We don't increment the counter to allow the colon to be parsed after this
+                    }
+                    else
+                    {
+                        stringBuilder.Append(@char);
+                    }
+                    
+                    i++;
+                }
+                
+                arguments.Add(stringBuilder.ToString());
+                stringBuilder.Clear();
+
+                expectingArgument = false;
+            }
+
+            if (arguments.Count == 0)
+            {
+                message = new Message();
+                return false;
+            }
+
+            message = new Message
+            {
+                Id = arguments[0],
+                Arguments = arguments.Skip(1).ToArray()
+            };
+
+            return true;
+        }
+    }
+}
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Properties/AssemblyInfo.cs b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000000..c7c00e66a2
--- /dev/null
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeConnection/Properties/AssemblyInfo.cs
@@ -0,0 +1,35 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("GodotTools.IdeConnection")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("")]
+[assembly: AssemblyCopyright("Godot Engine contributors")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("92600954-25F0-4291-8E11-1FEE9FC4BE20")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]