✨ TestClient, but wait, what are we actually need?

Signed-off-by: 秋雨落 <i@rain.cx>

ConnectorTest/ConnectorTest.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+    
+    <ItemGroup>
+      <PackageReference Include="Nakov.IO.Cin" Version="2.0.2.1" />
+      <PackageReference Include="System.Formats.Cbor" Version="8.0.0-rc.1.23419.4" />
+      <PackageReference Include="System.Net.WebSockets.Client" Version="4.3.2" />
+    </ItemGroup>
+
+</Project>

ConnectorTest/Program.cs

@@ -0,0 +1,156 @@
+using System.Formats.Cbor;
+using System.Net.WebSockets;
+
+var webSocket = new ClientWebSocket();
+var cborWriter = new CborWriter();
+
+while (true)
+{
+    try
+    {
+        await Process();
+    }
+    catch (Exception ex)
+    {
+        Console.WriteLine(ex);
+    }
+}
+
+async Task Receive()
+{
+    var buffer = new byte[1024 * 4];
+    var result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
+
+    while (!result.CloseStatus.HasValue)
+    {
+        var reader = new CborReader(new ReadOnlyMemory<byte>(buffer, 0, result.Count));
+        Console.WriteLine(reader.BytesRemaining);
+        
+        result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
+    }
+}
+
+async Task Process()
+{
+    Console.Write("> ");
+    var operation = Console.ReadLine();
+
+    if (operation == "")
+    {
+        return;
+    }
+
+    if (operation == "connect")
+    {
+        var uri = Console.ReadLine();
+        await webSocket.ConnectAsync(new Uri(uri!), CancellationToken.None);
+        Receive();
+    }
+    else if (operation == "message")
+    {
+        cborWriter.Reset();
+        cborWriter.WriteStartArray(null);
+    }
+    else if (operation == "send")
+    {
+        cborWriter.WriteEndArray();
+        var bytes = cborWriter.Encode();
+        await webSocket.SendAsync(bytes, WebSocketMessageType.Binary, true, CancellationToken.None);
+    }
+    else if (operation == "bye")
+    {
+        await webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None);
+        webSocket = new ClientWebSocket();
+    }
+    else if (operation == "help")
+    {
+        Console.WriteLine("Every space should use enter.");
+        Console.WriteLine("Connect to a server: connect <uri>");
+        Console.WriteLine("New message: message");
+        Console.WriteLine("Send message: send");
+        Console.WriteLine("Close websocket: bye");
+        Console.WriteLine("Insert data: data <type> <value>");
+    }
+    else if (operation == "data")
+    {
+        var type = Console.ReadLine();
+        var valueStr = Console.ReadLine();
+        
+        if (type == "string")
+        {
+            cborWriter.WriteTextString(valueStr!);
+        }
+        else if (type == "int")
+        {
+            var result = int.TryParse(valueStr, out var value);
+            while (!result)
+            {
+                valueStr = Console.ReadLine();
+                
+                result = int.TryParse(valueStr, out value);
+            }
+            cborWriter.WriteInt32(value);
+        }
+        else if (type == "long")
+        {
+            var result = long.TryParse(valueStr, out var value);
+            while (!result)
+            {
+                valueStr = Console.ReadLine();
+                
+                result = long.TryParse(valueStr, out value);
+            }
+            cborWriter.WriteInt64(value);
+        }
+        else if (type == "bool")
+        {
+            var result = bool.TryParse(valueStr, out var value);
+            while (!result)
+            {
+                valueStr = Console.ReadLine();
+                
+                result = bool.TryParse(valueStr, out value);
+            }
+            cborWriter.WriteBoolean(value);
+        }
+        else if (type == "float")
+        {
+            var result = float.TryParse(valueStr, out var value);
+            while (!result)
+            {
+                valueStr = Console.ReadLine();
+                
+                result = float.TryParse(valueStr, out value);
+            }
+            cborWriter.WriteSingle(value);
+        }
+        else if (type == "double")
+        {
+            var result = double.TryParse(valueStr, out var value);
+            while (!result)
+            {
+                valueStr = Console.ReadLine();
+                
+                result = double.TryParse(valueStr, out value);
+            }
+            cborWriter.WriteDouble(value);
+        }
+        else if (type == "decimal")
+        {
+            var result = decimal.TryParse(valueStr, out var value);
+            while (!result)
+            {
+                valueStr = Console.ReadLine();
+                
+                result = decimal.TryParse(valueStr, out value);
+            }
+            cborWriter.WriteDecimal(value);
+        }
+        else if (type == "null")
+        {
+            cborWriter.WriteNull();
+        }
+    }
+
+    Console.WriteLine("Done!");
+}

CrystalConnector.sln

@@ -2,6 +2,8 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CrystalConnector", "CrystalConnector\CrystalConnector.csproj", "{9DA4D124-899F-4946-8BFC-510654340357}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConnectorTest", "ConnectorTest\ConnectorTest.csproj", "{7DA8728D-146A-4E85-AEB8-A48130836CF7}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -12,5 +14,9 @@ Global
 		{9DA4D124-899F-4946-8BFC-510654340357}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{9DA4D124-899F-4946-8BFC-510654340357}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{9DA4D124-899F-4946-8BFC-510654340357}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7DA8728D-146A-4E85-AEB8-A48130836CF7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7DA8728D-146A-4E85-AEB8-A48130836CF7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7DA8728D-146A-4E85-AEB8-A48130836CF7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7DA8728D-146A-4E85-AEB8-A48130836CF7}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal

CrystalConnector/Handlers/HandlerConstants.cs

@@ -0,0 +1,8 @@
+namespace CrystalConnector.Handlers;
+
+public class HandlerConstants
+{
+    public static readonly string MessageTypeAuthenticate = "Authenticate";
+    public static readonly string MessageTypeRegisterHandler = "Register";
+    public static readonly string MessageTypeEmit = "Emit";
+}

CrystalConnector/Handlers/MessageException.cs

@@ -0,0 +1,9 @@
+namespace CrystalConnector.Handlers;
+
+public class MessageException : Exception
+{
+    public MessageException(string message) 
+        : base(message)
+    {
+    }
+}

CrystalConnector/Handlers/WebSocketHandler.cs

@@ -20,17 +20,34 @@ public class WebSocketHandler
     
     public void Handle(WebSocket webSocket, CborReader reader)
     {
+        reader.ReadStartArray();
+        
         var type = reader.ReadTextString();
-        if (type == "Authenticate")
+        if (type == HandlerConstants.MessageTypeAuthenticate)
         {
             if (!webSocket.GetConnectionInfo().Authorized)
             {
                 var secret = reader.ReadTextString();
                 if (secret == Config.GetValue<string>("Connector:Auth:Secret"))
                 {
+                    Logger.LogInformation("Client {Id} authorized", webSocket.GetConnectionInfo().Id);
                     webSocket.GetConnectionInfo().Authorized = true;
                 }
+                else
+                {
+                    throw new MessageException("Auth failed!");
                 }
             }
+            else
+            {
+                throw new MessageException("You are already authorized.");
+            }
+        }
+        else if (type == "")
+        {
+            
+        }
+        
+        reader.ReadEndArray();
     }
 }

CrystalConnector/Utilities/WebSocketExtension.cs

@@ -24,11 +24,21 @@ public static class WebSocketExtension
 
     public static void Disconnect(this WebSocket webSocket)
     {
-        var data = GetConnectionInfo(webSocket);
-        data.CompletionSource.SetResult(WebSocketHandleResult.Successful);
+        var info = GetConnectionInfo(webSocket);
+        info.CompletionSource.SetResult(WebSocketHandleResult.Successful);
 
         webSocket.CloseOutputAsync(WebSocketCloseStatus.NormalClosure, "", CancellationToken.None);
         
         WebSocketConnectionManager.Info.Remove(webSocket);
     }
+
+    public static async Task Send(this WebSocket webSocket, byte[] data)
+    {
+        await webSocket.Send(data, 0, data.Length);
+    }
+    
+    public static async Task Send(this WebSocket webSocket, byte[] data, int startIndex, int length)
+    {
+        await webSocket.SendAsync(new ReadOnlyMemory<byte>(data, startIndex, length), WebSocketMessageType.Binary, true, CancellationToken.None);
+    }
 }

CrystalConnector/WebSockets/WebSocketManager.cs

@@ -4,6 +4,7 @@ using System.Net.WebSockets;
 using CrystalConnector.Handlers;
 using CrystalConnector.Utilities;
 using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Logging;
 
 namespace CrystalConnector.WebSockets;
@@ -12,11 +13,14 @@ public class WebSocketManager : IWebSocketManager
 {
     private ILogger<WebSocketManager> Logger { get; }
     
+    private IConfiguration Config { get; }
+
     private WebSocketHandler Handler { get; }
 
-    public WebSocketManager(ILogger<WebSocketManager> logger, WebSocketHandler handler)
+    public WebSocketManager(ILogger<WebSocketManager> logger, IConfiguration config, WebSocketHandler handler)
     {
         Logger = logger;
+        Config = config;
         Handler = handler;
     }
 
@@ -36,7 +40,32 @@ public class WebSocketManager : IWebSocketManager
         {
             var reader = new CborReader(new ReadOnlyMemory<byte>(buffer, 0, receiveResult.Count));
 
+            try
+            {
                 Handler.Handle(webSocket, reader);
+            }
+            catch (CborContentException ex)
+            {
+                if (Config.GetValue<bool>("Connector:Debug"))
+                {
+                    Logger.LogWarning(ex, "Malformed message!");
+                }
+                
+                Disconnect(webSocket);
+            }
+            catch (InvalidOperationException ex)
+            {
+                if (Config.GetValue<bool>("Connector:Debug"))
+                {
+                    Logger.LogWarning(ex, "Bad message!");
+                }
+                Disconnect(webSocket);
+            }
+            catch (MessageException ex)
+            {
+                Logger.LogWarning(ex, "Why do that?");
+                Disconnect(webSocket);
+            }
             
             receiveResult = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
         }

CrystalConnector/config.json

@@ -14,8 +14,9 @@
         ]
     },
     "Connector": {
+        "Debug": false,
         "Auth": {
-            "Secret": "qyl27IsHere!"
+            "Secret": "<I am an example secret!>"
         }
     }
 }

README.md

@@ -1,2 +1,62 @@
-# CrystalConnector
-【水晶互联】猫猫之间的三次握爪，四次摇尾巴！
+# CrystalConnector / 水晶互联
+猫猫之间的三次握爪，四次摇尾巴！
+
+
+
+## 传输协议
+
+水晶互联采用 WebSocket 进行消息传输，使用 CBOR 进行消息编码。
+
+为了贴近 Guava 中 `ByteArrayDataInput` / `ByteArrayDataOutput` 的使用习惯，规定以单层基本类型的数组形式使用 CBOR 。（Todo：支持更复杂的结构。）
+
+参考代码：
+
+```c#
+var writer = new CborWriter();
+writer.WriteStartArray(null);    // 不定长数组
+// 消息序列化
+writer.WriteEndArray();
+
+var reader = new CborReader(buffer);
+reader.ReadStartArray();
+// 消息反序列化
+reader.ReadEndArray();
+```
+
+### 文档约定
+
+文档中的代码块，以行首的 `>` 代表客户端向服务端传输的消息；以行首的 `<` 代表服务端向客户端传输的消息。其后的消息以纯文本形式发送。如需某一端进行操作，在尖括号后以 `!` 标志体现。
+
+服务端是指水晶互联的服务端，一个 C# 程序用来完成消息转发操作。
+
+客户端是指所有通过 WebSocket 连接服务端的消息提供或消费者。
+
+文档中使用尖括号对 `<type:Name>` 代表必填参数，方括号对 `[type:Name]` 代表可选参数。 `type` 是参数类型，如 `string` 、 `int` 等。 `Name` 是参数名，不在具体传输过程中体现，是方便开发人员记忆的名称。
+
+### 客户端 to 服务端
+
+#### 认证客户端
+
+为了防止未授权的传输，水晶互联需要一个 SecretKey 来信任客户端，它由服务端配置文件指定。（这个设计没有任何安全性的保证，请保证不在公网中使用它。）
+
+认证请求：
+
+```
+> Authenticate
+> <string:SecretKey>
+```
+
+认证成功：
+
+```
+< Authenticated
+```
+
+认证失败：
+
+```
+<! Close
+```
+
+#### 注册接收器
+