add color to server

README.md

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+# Massive
+
+<!--toc:start-->
+
+- [Massive](#massive)
+  - [Setup](#setup) - [Install run-times](#install-run-times) - [Install SpacetimeDB](#install-spacetimedb)
+  <!--toc:end-->
+
+## Setup
+
+### Install run-times
+
+```bash
+mise install
+```
+
+### Install SpacetimeDB
+
+```bash
+curl -sSf https://install.spacetimedb.com | sh
+```
+
+Installs to
+
+```
+CLI configuration directory: /home/baobeld/.config/spacetime/
+Spacetime binary: /home/baobeld/.local/bin/spacetime
+directory for installed SpacetimeDB versions: /home/baobeld/.local/share/spacetime/bin
+database directory: /home/baobeld/.local/share/spacetime/data
+```
+
+And enable WebAssembly:
+
+```bash
+dotnet workload install wasi-experimental
+```
+
+```bash
+bun server:up
+```
+
+Add the spacetime docker server to your cli
+
+```bash
+spacetime server add --url http://localhost:3000 massive
+```

client/.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true

client/.gitignore

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+# Godot 4+ specific ignores
+.godot/
+/android/
+module_bindings/

client/Game.cs

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+using Godot;
+
+public partial class Game : Node
+{
+  private Spacetime spacetime;
+
+  public override void _EnterTree()
+  {
+    spacetime = Spacetime.Instance;
+  }
+
+  // Called every frame. 'delta' is the elapsed time since the previous frame.
+  public override void _Process(double delta)
+  {
+    spacetime.Connection.FrameTick();
+  }
+
+  public override void _ExitTree()
+  {
+    spacetime.Connection.Disconnect();
+  }
+}

client/Game.cs.uid

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+uid://bg6n0cm6dds7j

client/UserUtils.cs

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+using Godot;
+using SpacetimeDB.Types;
+
+public static class UserUtils
+{
+    public static Color ParseColor(User user)
+    {
+        return user.Color != null && Color.HtmlIsValid(user.Color)
+            ? Color.FromHtml(user.Color)
+            : Colors.AliceBlue;
+    }
+
+    public static string UserNameOrIdentity(User user)
+    {
+        return user != null ? user.Name ?? user.Identity.ToString()[..8] : "unknown";
+    }
+}

client/UserUtils.cs.uid

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+uid://dnaxnse8ipje0

client/chat/ChatInput.cs

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+using Godot;
+using SpacetimeDB;
+using SpacetimeDB.Types;
+
+public partial class ChatInput : LineEdit
+{
+    public override void _EnterTree()
+    {
+        TextSubmitted += OnMessageInput;
+    }
+
+    // Called when the node enters the scene tree for the first time.
+    public override void _Ready()
+    {
+        DbConnection conn = Spacetime.Instance.Connection;
+        RegisterSubscriptions(conn);
+    }
+
+    void OnMessageInput(string text)
+    {
+        Spacetime.Instance.Connection.Reducers.SendMessage(text);
+        Text = "";
+    }
+
+    void RegisterSubscriptions(DbConnection conn)
+    {
+        conn.Reducers.OnSendMessage += Reducer_OnSendMessageEvent;
+    }
+
+    /// Our `OnSendMessageEvent` callback: print a warning if the reducer failed.
+    void Reducer_OnSendMessageEvent(ReducerEventContext ctx, string text)
+    {
+        var e = ctx.Event;
+        if (e.CallerIdentity == Spacetime.Instance.Identity && e.Status is Status.Failed(var error))
+        {
+            GD.PrintErr($"Failed to send message {text}: {error}");
+        }
+    }
+}

client/chat/ChatInput.cs.uid

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+uid://115ssbk8epio

client/chat/ChatLog.cs

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+using Godot;
+using SpacetimeDB;
+using SpacetimeDB.Types;
+
+public partial class ChatLog : RichTextLabel
+{
+    private static readonly Color SystemColor = Colors.Gray;
+
+    public override void _EnterTree()
+    {
+        ClearLog();
+    }
+
+    public override void _Ready()
+    {
+        DbConnection conn = Spacetime.Instance.Connection;
+        RegisterSubscriptions(conn);
+    }
+
+    void PushMessage(string name, string message, Color color)
+    {
+        string entry = $"[color={color.ToHtml()}]{name}:[/color] {message}";
+        this.Text += $"{entry}\n";
+    }
+
+    void ClearLog()
+    {
+        Text = "";
+    }
+
+    void RegisterSubscriptions(DbConnection conn)
+    {
+        conn.Db.User.OnInsert += User_OnInsert;
+        conn.Db.User.OnUpdate += User_OnUpdate;
+
+        conn.Db.Message.OnInsert += Message_OnInsert;
+    }
+
+    void User_OnInsert(EventContext ctx, User insertedValue)
+    {
+        if (ctx.Event is Event<Reducer>.SubscribeApplied)
+        {
+            return;
+        }
+        PushMessage(
+            "System",
+            $"{UserUtils.UserNameOrIdentity(insertedValue)} connected",
+            SystemColor
+        );
+    }
+
+    void User_OnUpdate(EventContext ctx, User oldValue, User newValue)
+    {
+        if (oldValue.Name != newValue.Name)
+        {
+            PushMessage(
+                "System",
+                $"{UserUtils.UserNameOrIdentity(oldValue)} renamed to {UserUtils.UserNameOrIdentity(newValue)}",
+                SystemColor
+            );
+        }
+        if (oldValue.Online != newValue.Online)
+        {
+            if (newValue.Online)
+            {
+                PushMessage(
+                    "System",
+                    $"{UserUtils.UserNameOrIdentity(newValue)} connected",
+                    SystemColor
+                );
+            }
+            else
+            {
+                PushMessage(
+                    "System",
+                    $"{UserUtils.UserNameOrIdentity(newValue)} disconnected",
+                    SystemColor
+                );
+            }
+        }
+    }
+
+    void Message_OnInsert(EventContext ctx, Message insertedValue)
+    {
+        User sender = ctx.Db.User.Identity.Find(insertedValue.Sender);
+        Color color = ctx.Identity == sender.Identity ? UserUtils.ParseColor(sender) : Colors.Red;
+        if (ctx.Event is Event<Reducer>.SubscribeApplied)
+        {
+            PushMessage(UserUtils.UserNameOrIdentity(sender), insertedValue.Text, color);
+            return;
+        }
+        PushMessage(UserUtils.UserNameOrIdentity(sender), insertedValue.Text, color);
+    }
+}

client/chat/ChatLog.cs.uid

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+uid://cgn6wa7td0ekp

client/chat/ChatOptions.cs

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+using Godot;
+using SpacetimeDB;
+using SpacetimeDB.Types;
+
+public partial class ChatOptions : HBoxContainer
+{
+    public LineEdit Username { get; private set; }
+    public ColorPickerButton ColorPicker { get; private set; }
+
+    public override void _EnterTree()
+    {
+        Username = GetNode<LineEdit>("Username");
+        ColorPicker = GetNode<ColorPickerButton>("ColorPicker");
+
+        Username.TextSubmitted += OnUsernameChanged;
+        Username.FocusExited += ResetUsername;
+
+        ColorPicker.ColorChanged += OnColorChange;
+    }
+
+    public override void _Ready()
+    {
+        DbConnection conn = Spacetime.Instance.Connection;
+        RegisterSubscriptions(conn);
+    }
+
+    void ResetUsername()
+    {
+        Username.Text = UserUtils.UserNameOrIdentity(Spacetime.Instance.Me);
+    }
+
+    void OnUsernameChanged(string text)
+    {
+        Spacetime.Instance.Connection.Reducers.SetName(text);
+    }
+
+    void OnColorChange(Color color)
+    {
+        Spacetime.Instance.Connection.Reducers.SetColor(color.ToHtml(false));
+    }
+
+    void RegisterSubscriptions(DbConnection conn)
+    {
+        conn.Db.User.OnInsert += User_OnInsert;
+        conn.Db.User.OnUpdate += User_OnUpdate;
+        conn.Reducers.OnSetName += Reducer_OnSetNameEvent;
+        conn.Reducers.OnSetColor += Reducer_OnSetColorEvent;
+    }
+
+    void User_OnInsert(EventContext ctx, User insertedValue)
+    {
+        // It's me
+        if (ctx.Identity == insertedValue.Identity)
+        {
+            Username.Text = insertedValue.Name;
+            ColorPicker.Color =
+                insertedValue.Color != null && Color.HtmlIsValid(insertedValue.Color)
+                    ? Color.FromHtml(insertedValue.Color)
+                    : Colors.AliceBlue;
+        }
+    }
+
+    void User_OnUpdate(EventContext ctx, User oldValue, User newValue)
+    {
+        if (ctx.Identity == oldValue.Identity && ctx.Identity == newValue.Identity)
+        {
+            Username.Text = newValue.Name;
+            ColorPicker.Color =
+                newValue.Color != null && Color.HtmlIsValid(newValue.Color)
+                    ? Color.FromHtml(newValue.Color)
+                    : Colors.AliceBlue;
+        }
+    }
+
+    /// Our `OnSetNameEvent` callback: print a warning if the reducer failed.
+    void Reducer_OnSetNameEvent(ReducerEventContext ctx, string name)
+    {
+        var e = ctx.Event;
+        if (e.CallerIdentity != Spacetime.Instance.Identity)
+        {
+            //  Not me
+            return;
+        }
+        if (e.Status is Status.Failed(var error))
+        {
+            GD.PrintErr($"Failed to change name to {name}: {error}");
+            return;
+        }
+    }
+
+    void Reducer_OnSetColorEvent(ReducerEventContext ctx, string color)
+    {
+        var e = ctx.Event;
+        if (e.CallerIdentity != Spacetime.Instance.Identity)
+        {
+            //  Not me
+            return;
+        }
+        if (e.Status is Status.Failed(var error))
+        {
+            GD.PrintErr($"Failed to change color to {color}: {error}");
+            return;
+        }
+    }
+}

client/chat/ChatOptions.cs.uid

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+uid://tff5u6blrc1d

client/chat/ChatWindow.cs

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+using Godot;
+
+public partial class ChatWindow : VBoxContainer
+{
+    private ChatOptions _options;
+    private ChatLog _log;
+    private LineEdit _input;
+
+    // Called when the node enters the scene tree for the first time.
+    public override void _EnterTree()
+    {
+        _options = GetNode<ChatOptions>("Options");
+        _log = GetNode<ChatLog>("ChatLog");
+        _input = GetNode<ChatInput>("ChatInput");
+    }
+}

client/chat/ChatWindow.cs.uid

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+uid://c3s41dv7hv4md

client/chat/ChatWindow.tscn

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+[gd_scene load_steps=5 format=3 uid="uid://cqmy41vtnqd6f"]
+
+[ext_resource type="Script" uid="uid://c3s41dv7hv4md" path="res://chat/ChatWindow.cs" id="1_d8jvm"]
+[ext_resource type="Script" uid="uid://cgn6wa7td0ekp" path="res://chat/ChatLog.cs" id="2_fkxbv"]
+[ext_resource type="Script" uid="uid://tff5u6blrc1d" path="res://chat/ChatOptions.cs" id="2_lvlsn"]
+[ext_resource type="Script" uid="uid://115ssbk8epio" path="res://chat/ChatInput.cs" id="4_yd183"]
+
+[node name="Chat Window" type="VBoxContainer"]
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_d8jvm")
+
+[node name="Options" type="HBoxContainer" parent="."]
+layout_mode = 2
+alignment = 2
+script = ExtResource("2_lvlsn")
+
+[node name="Label" type="Label" parent="Options"]
+layout_mode = 2
+text = "Username:"
+
+[node name="Username" type="LineEdit" parent="Options"]
+custom_minimum_size = Vector2(120, 0)
+layout_mode = 2
+
+[node name="ColorPicker" type="ColorPickerButton" parent="Options"]
+layout_mode = 2
+text = "Color"
+
+[node name="ChatLog" type="RichTextLabel" parent="."]
+layout_mode = 2
+size_flags_vertical = 3
+bbcode_enabled = true
+text = "BBCode [color=green]test[/color]"
+scroll_following = true
+vertical_alignment = 2
+script = ExtResource("2_fkxbv")
+
+[node name="ChatInput" type="LineEdit" parent="."]
+layout_mode = 2
+script = ExtResource("4_yd183")

client/client.csproj

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+<Project Sdk="Godot.NET.Sdk/4.4.1">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <EnableDynamicLoading>true</EnableDynamicLoading>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="SpacetimeDB.ClientSDK" Version="1.1.1" />
+  </ItemGroup>
+</Project>

client/client.sln

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+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2012
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "client", "client.csproj", "{CCE38DAE-1CEC-451D-8D68-43EEB50F989E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+	Debug|Any CPU = Debug|Any CPU
+	ExportDebug|Any CPU = ExportDebug|Any CPU
+	ExportRelease|Any CPU = ExportRelease|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{CCE38DAE-1CEC-451D-8D68-43EEB50F989E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CCE38DAE-1CEC-451D-8D68-43EEB50F989E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CCE38DAE-1CEC-451D-8D68-43EEB50F989E}.ExportDebug|Any CPU.ActiveCfg = ExportDebug|Any CPU
+		{CCE38DAE-1CEC-451D-8D68-43EEB50F989E}.ExportDebug|Any CPU.Build.0 = ExportDebug|Any CPU
+		{CCE38DAE-1CEC-451D-8D68-43EEB50F989E}.ExportRelease|Any CPU.ActiveCfg = ExportRelease|Any CPU
+		{CCE38DAE-1CEC-451D-8D68-43EEB50F989E}.ExportRelease|Any CPU.Build.0 = ExportRelease|Any CPU
+	EndGlobalSection
+EndGlobal

client/icon.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="128" height="128"><rect width="124" height="124" x="2" y="2" fill="#363d52" stroke="#212532" stroke-width="4" rx="14"/><g fill="#fff" transform="translate(12.322 12.322)scale(.101)"><path d="M105 673v33q407 354 814 0v-33z"/><path fill="#478cbf" d="m105 673 152 14q12 1 15 14l4 67 132 10 8-61q2-11 15-15h162q13 4 15 15l8 61 132-10 4-67q3-13 15-14l152-14V427q30-39 56-81-35-59-83-108-43 20-82 47-40-37-88-64 7-51 8-102-59-28-123-42-26 43-46 89-49-7-98 0-20-46-46-89-64 14-123 42 1 51 8 102-48 27-88 64-39-27-82-47-48 49-83 108 26 42 56 81zm0 33v39c0 276 813 276 814 0v-39l-134 12-5 69q-2 10-14 13l-162 11q-12 0-16-11l-10-65H446l-10 65q-4 11-16 11l-162-11q-12-3-14-13l-5-69z"/><path d="M483 600c0 34 58 34 58 0v-86c0-34-58-34-58 0z"/><circle cx="725" cy="526" r="90"/><circle cx="299" cy="526" r="90"/></g><g fill="#414042" transform="translate(12.322 12.322)scale(.101)"><circle cx="307" cy="532" r="60"/><circle cx="717" cy="532" r="60"/></g></svg>

client/icon.svg.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bqjxu2injm0kq"
+path="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.svg"
+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

client/project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="Massive"
+run/main_scene="uid://bukwg8y6gdt3g"
+config/features=PackedStringArray("4.4", "C#", "Forward Plus")
+config/icon="res://icon.svg"
+
+[dotnet]
+
+project/assembly_name="client"
+
+[file_customization]
+
+folder_colors={
+"res://module_bindings/": "gray"
+}

client/root.tscn

@@ -0,0 +1,9 @@
+[gd_scene load_steps=3 format=3 uid="uid://bukwg8y6gdt3g"]
+
+[ext_resource type="PackedScene" uid="uid://cqmy41vtnqd6f" path="res://chat/ChatWindow.tscn" id="1_pq8q7"]
+[ext_resource type="Script" uid="uid://bg6n0cm6dds7j" path="res://Game.cs" id="1_pyidc"]
+
+[node name="Root" type="Node"]
+script = ExtResource("1_pyidc")
+
+[node name="Chat Window" parent="." instance=ExtResource("1_pq8q7")]

client/spacetime/Spacetime.cs

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+using System;
+using Godot;
+using SpacetimeDB;
+using SpacetimeDB.Types;
+
+public class Spacetime
+{
+    /// The URI of the SpacetimeDB instance hosting our chat database and module.
+    const string HOST = "http://localhost:3000";
+
+    /// The database name we chose when we published our module.
+    const string DB_NAME = "massive";
+
+    public static Spacetime Instance
+    {
+        get
+        {
+            if (_instance == null)
+            {
+                _instance = new Spacetime(HOST, DB_NAME);
+            }
+            return _instance;
+        }
+    }
+
+    // our local client SpacetimeDB identity
+    public Identity Identity { get; private set; }
+    public DbConnection Connection { get; private set; }
+    public User Me
+    {
+        get => Connection.Db.User.Identity.Find(Identity);
+    }
+
+    private static Spacetime _instance;
+
+    public Spacetime(string host, string dbName)
+    {
+        // Initialize the `AuthToken` module
+        AuthToken.Init(".spacetime_csharp_quickstart");
+
+        Connection = DbConnection
+            .Builder()
+            .WithUri(host)
+            .WithModuleName(dbName)
+            .WithToken(AuthToken.Token)
+            .OnConnect(OnConnected)
+            .OnConnectError(OnConnectError)
+            .OnDisconnect(OnDisconnected)
+            .Build();
+    }
+
+    /// Our `OnConnected` callback: save our credentials to a file.
+    void OnConnected(DbConnection conn, Identity identity, string authToken)
+    {
+        Identity = identity;
+        AuthToken.SaveToken(authToken);
+
+        conn.SubscriptionBuilder().OnApplied(OnSubscriptionApplied).SubscribeToAllTables();
+    }
+
+    /// Our `OnSubscriptionApplied` callback:
+    /// sort all past messages and print them in timestamp order.
+    void OnSubscriptionApplied(SubscriptionEventContext ctx)
+    {
+        GD.Print("Connected");
+    }
+
+    /// Our `OnConnectError` callback: print the error, then exit the process.
+    void OnConnectError(Exception e)
+    {
+        GD.PrintErr($"Error while connecting: {e}");
+    }
+
+    /// Our `OnDisconnect` callback: print a note, then exit the process.
+    void OnDisconnected(DbConnection conn, Exception? e)
+    {
+        if (e != null)
+        {
+            GD.PrintErr($"Disconnected abnormally: {e}");
+        }
+        else
+        {
+            GD.Print($"Disconnected normally.");
+        }
+    }
+}

client/spacetime/Spacetime.cs.uid

@@ -0,0 +1 @@
+uid://dug30f321xvvt

docker-compose.yml

@@ -0,0 +1,7 @@
+name: Massive
+services:
+  spacetime:
+    image: clockworklabs/spacetime
+    ports:
+      - 3000:3000
+    command: start

massive.sln

@@ -0,0 +1,28 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "client", "client\client.csproj", "{BDFCBF69-C44E-4188-A9FC-2CFED6EC2246}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StdbModule", "server\StdbModule.csproj", "{25B51793-082D-44ED-A8D2-4A87A11F1882}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{BDFCBF69-C44E-4188-A9FC-2CFED6EC2246}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BDFCBF69-C44E-4188-A9FC-2CFED6EC2246}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BDFCBF69-C44E-4188-A9FC-2CFED6EC2246}.Release|Any CPU.ActiveCfg = Debug|Any CPU
+		{BDFCBF69-C44E-4188-A9FC-2CFED6EC2246}.Release|Any CPU.Build.0 = Debug|Any CPU
+		{25B51793-082D-44ED-A8D2-4A87A11F1882}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{25B51793-082D-44ED-A8D2-4A87A11F1882}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{25B51793-082D-44ED-A8D2-4A87A11F1882}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{25B51793-082D-44ED-A8D2-4A87A11F1882}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

package.json

@@ -0,0 +1,14 @@
+{
+	"name": "massive",
+	"scripts": {
+		"server:up": "docker compose up -d",
+		"server:down": "docker compose down",
+		"server:build": "dotnet build server",
+		"server:add": "spacetime server add --url http://localhost:3000 massive --default",
+		"server:publish": "spacetime publish --project-path server --server massive",
+		"server:generate": "spacetime generate --lang csharp --out-dir client/module_bindings --project-path server"
+	},
+	"devDependencies": {
+		"@types/bun": "latest"
+	}
+}

server/.gitignore

@@ -0,0 +1,2 @@
+bin
+obj

server/Lib.cs

@@ -0,0 +1,140 @@
+using System.Text.RegularExpressions;
+using SpacetimeDB;
+
+public static partial class Module
+{
+    [Table(Name = "User", Public = true)]
+    public partial class User
+    {
+        [PrimaryKey]
+        public Identity Identity;
+        public string? Name;
+        public string? Color;
+        public bool Online;
+    }
+
+    [Table(Name = "Message", Public = true)]
+    public partial class Message
+    {
+        public Identity Sender;
+        public Timestamp Sent;
+        public string Text = "";
+    }
+
+    [Reducer]
+    public static void SetName(ReducerContext ctx, string name)
+    {
+        name = ValidateName(name);
+
+        var user = ctx.Db.User.Identity.Find(ctx.Sender);
+        if (user is not null)
+        {
+            user.Name = name;
+            ctx.Db.User.Identity.Update(user);
+        }
+    }
+
+    /// Takes a name and checks if it's acceptable as a user's name.
+    private static string ValidateName(string name)
+    {
+        if (string.IsNullOrEmpty(name))
+        {
+            throw new Exception("Names must not be empty");
+        }
+        return name;
+    }
+
+    [Reducer]
+    public static void SetColor(ReducerContext ctx, string color)
+    {
+        color = ValidateColor(color);
+
+        var user = ctx.Db.User.Identity.Find(ctx.Sender);
+        if (user is not null)
+        {
+            user.Color = color;
+            ctx.Db.User.Identity.Update(user);
+        }
+    }
+
+    private static string ValidateColor(string color)
+    {
+        var regex = new Regex("^([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$");
+        if (!regex.IsMatch(color))
+        {
+            throw new Exception("Invalid color code");
+        }
+        return color;
+    }
+
+    [Reducer]
+    public static void SendMessage(ReducerContext ctx, string text)
+    {
+        text = ValidateMessage(text);
+        Log.Info(text);
+        ctx.Db.Message.Insert(
+            new Message
+            {
+                Sender = ctx.Sender,
+                Text = text,
+                Sent = ctx.Timestamp,
+            }
+        );
+    }
+
+    /// Takes a message's text and checks if it's acceptable to send.
+    private static string ValidateMessage(string text)
+    {
+        if (string.IsNullOrEmpty(text))
+        {
+            throw new ArgumentException("Messages must not be empty");
+        }
+        return text;
+    }
+
+    [Reducer(ReducerKind.ClientConnected)]
+    public static void ClientConnected(ReducerContext ctx)
+    {
+        Log.Info($"Connect {ctx.Sender}");
+        var user = ctx.Db.User.Identity.Find(ctx.Sender);
+
+        if (user is not null)
+        {
+            // If this is a returning user, i.e., we already have a `User` with this `Identity`,
+            // set `Online: true`, but leave `Name` and `Identity` unchanged.
+            user.Online = true;
+            ctx.Db.User.Identity.Update(user);
+        }
+        else
+        {
+            // If this is a new user, create a `User` object for the `Identity`,
+            // which is online, but hasn't set a name.
+            ctx.Db.User.Insert(
+                new User
+                {
+                    Name = null,
+                    Identity = ctx.Sender,
+                    Online = true,
+                }
+            );
+        }
+    }
+
+    [Reducer(ReducerKind.ClientDisconnected)]
+    public static void ClientDisconnected(ReducerContext ctx)
+    {
+        var user = ctx.Db.User.Identity.Find(ctx.Sender);
+
+        if (user is not null)
+        {
+            // This user should exist, so set `Online: false`.
+            user.Online = false;
+            ctx.Db.User.Identity.Update(user);
+        }
+        else
+        {
+            // User does not exist, log warning
+            Log.Warn("Warning: No user found for disconnected client.");
+        }
+    }
+}

server/StdbModule.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <RuntimeIdentifier>wasi-wasm</RuntimeIdentifier>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="SpacetimeDB.Runtime" Version="1.1.*" />
+  </ItemGroup>
+
+</Project>

server/global.json

@@ -0,0 +1,6 @@
+{
+  "sdk": {
+    "version": "8.0.400",
+    "rollForward": "latestMinor"
+  }
+}