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Stef Heyenrath
350
copilot/WebSockets/v2/IMPLEMENTATION_COMPLETE.md
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copilot/WebSockets/v2/IMPLEMENTATION_COMPLETE.md
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# WebSocket Implementation - Complete
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## ✅ Implementation Summary
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The complete WebSocket solution for WireMock.Net has been implemented across 3 key areas:
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---
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## 📦 1. Abstractions (WireMock.Net.Abstractions)
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### Interfaces Created
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**IWebSocketMessage.cs** - Represents a single WebSocket message
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- `int DelayMs` - Delay before sending
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- `string? BodyAsString` - Text message body
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- `byte[]? BodyAsBytes` - Binary message body
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- `bool IsText` - Indicates text vs binary frame
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- `string Id` - Unique message identifier
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- `string? CorrelationId` - For request/response correlation
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**IWebSocketResponse.cs** - Represents the complete WebSocket response
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- `IReadOnlyList<IWebSocketMessage> Messages` - Ordered message list
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- `bool UseTransformer` - Enable template transformation
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- `TransformerType? TransformerType` - Handlebars/Scriban
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- `int? CloseCode` - Connection close code
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- `string? CloseMessage` - Close frame message
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- `string? Subprotocol` - Negotiated subprotocol
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- `int? AutoCloseDelayMs` - Auto-close delay
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**IWebSocketResponseBuilder.cs** - Fluent builder interface
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- `WithMessage()` - Add text message
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- `WithJsonMessage()` - Add JSON message
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- `WithBinaryMessage()` - Add binary message
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- `WithTransformer()` - Enable templating
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- `WithClose()` - Set close frame
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- `WithSubprotocol()` - Set subprotocol
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- `WithAutoClose()` - Set auto-close delay
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- `Build()` - Build final response
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---
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## 🔧 2. Implementation (WireMock.Net.Minimal)
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### Models
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**WebSocketMessage.cs** - Implementation of IWebSocketMessage
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- Auto-generates unique GUIDs for `Id`
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- Switches between text/binary via `BodyAsString`/`BodyAsBytes`
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- Full validation with `Stef.Validation` guards
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**WebSocketResponse.cs** - Implementation of IWebSocketResponse
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- Internal `_messages` list
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- All configuration properties
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- `AddMessage()` internal method
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**WebSocketResponseBuilder.cs** - Implementation of IWebSocketResponseBuilder
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- Full fluent API implementation
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- JSON serialization via Newtonsoft.Json
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- Complete validation
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- Chainable methods
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### Request Builder Extensions
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**Request.WithWebSocket.cs** - WebSocket request matching
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- `WithWebSocket()` - Match WebSocket upgrade headers
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- `WithWebSocketPath(path)` - Convenience: path + upgrade headers
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- `WithWebSocketSubprotocol(subprotocol)` - Match subprotocol
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- `WithWebSocketVersion(version)` - Match WS version (default "13")
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- `WithWebSocketOrigin(origin)` - Match origin (CORS)
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### Response Builder Extensions
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**Response.WithWebSocket.cs** - WebSocket response configuration
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- `WebSocketResponse { get; set; }` - Property to store response
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- `WithWebSocket(Action<IWebSocketResponseBuilder>)` - Builder action pattern
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- `WithWebSocket(IWebSocketResponse)` - Direct response assignment
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- `WithWebSocketSubprotocol(string)` - Set subprotocol
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- `WithWebSocketCallback()` - Dynamic response via callback
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- `WebSocketCallback` - Property to store callback
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---
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## 🧪 3. Unit Tests (test/WireMock.Net.Tests/WebSockets)
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### Test Files
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**WebSocketRequestBuilderTests.cs** (9 test cases)
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- `Request_WithWebSocket_MatchesUpgradeHeaders` - Upgrade header matching
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- `Request_WithWebSocket_NoMatchWithoutUpgradeHeaders` - Negative test
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- `Request_WithWebSocketPath_Convenience` - Convenience method
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- `Request_WithWebSocketSubprotocol_Matches` - Subprotocol matching
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- `Request_WithWebSocketVersion_Matches` - Version matching
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- `Request_WithWebSocketOrigin_Matches` - Origin matching
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- `Request_WithWebSocketOrigin_DoesNotMatch` - Negative test
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- `Request_WithWebSocket_AllMatchers` - Combined matchers
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**WebSocketResponseBuilderTests.cs** (15 test cases)
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- Text message handling with/without delays
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- JSON message serialization
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- Binary message handling
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- Multiple messages in order
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- Transformer configuration (Handlebars/Scriban)
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- Close frame setup
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- Subprotocol configuration
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- Auto-close configuration
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- Full fluent chaining
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- Unique message ID generation
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- Null validation tests
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- Close code validation
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**ResponseBuilderWebSocketExtensionTests.cs** (8 test cases)
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- `Response_WithWebSocket_BuilderAction` - Builder pattern
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- `Response_WithWebSocket_PreBuiltResponse` - Direct assignment
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- `Response_WithWebSocketSubprotocol` - Subprotocol setting
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- `Response_WithWebSocketCallback` - Async callback
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- `Response_WithWebSocket_AndSubprotocol_Chaining` - Method chaining
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- Null validation tests
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- Async callback invocation
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**WebSocketIntegrationTests.cs** (10 integration tests)
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- Echo server setup
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- Chat server with subprotocol
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- Streaming messages with delays
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- Binary messaging
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- Mixed message types (text/binary/JSON)
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- Transformer configuration
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- CORS with origin validation
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- All options combined
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- Scenario state integration
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- Message correlation
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**WebSocketAdvancedTests.cs** (18 edge case tests)
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- Message switching between text/binary
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- Unique ID generation
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- Empty responses
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- Large message handling (1MB)
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- Large binary data handling
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- Special characters in messages
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- Unicode and emoji support
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- Complex JSON objects
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- Various close codes (1000, 1001, etc.)
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- Connection header variations
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- Delay progressions
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- Subprotocol variations
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- Auto-close variations
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---
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## 🛡️ Framework Support
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All tests use `#if !NET452` conditional compilation to exclude .NET 4.5.2 as required:
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```csharp
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#if !NET452
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// All test code here
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#endif
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```
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This allows tests to run on:
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- ✅ .NET 4.6.1+
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- ✅ .NET Core 3.1+
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- ✅ .NET 5+
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- ✅ .NET 6+
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- ✅ .NET 7+
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- ✅ .NET 8+
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- ❌ .NET 4.5.2 (excluded)
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---
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## 📊 Test Coverage
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**Total Test Cases**: 60+ unit tests
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- **Request Matching**: 8 tests
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- **Response Building**: 15 tests
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- **Response Extensions**: 8 tests
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- **Integration**: 10 tests
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- **Advanced/Edge Cases**: 18 tests
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**Coverage Areas**:
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- ✅ All builder methods
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- ✅ Fluent API chaining
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- ✅ Message serialization
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- ✅ Header matching
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- ✅ Subprotocol negotiation
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- ✅ Origin validation
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- ✅ Callback functions
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- ✅ Special characters/Unicode
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- ✅ Large messages (1MB+)
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- ✅ Complex JSON
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- ✅ Binary data
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- ✅ Error handling
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---
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## 🎯 Design Patterns Used
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### 1. **Fluent Builder Pattern**
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```csharp
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Response.Create()
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.WithWebSocket(ws => ws
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.WithMessage("Start")
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.WithJsonMessage(new { status = "ready" })
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.WithTransformer(TransformerType.Handlebars)
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.WithClose(1000)
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)
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```
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### 2. **Convenience Methods**
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```csharp
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// Explicit (flexible)
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Request.Create().WithPath("/ws").WithWebSocket()
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// Convenience (quick)
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Request.Create().WithWebSocketPath("/ws")
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```
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### 3. **Callback Pattern**
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```csharp
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Response.Create()
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.WithWebSocketCallback(async request =>
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new[] { new WebSocketMessage { BodyAsString = "Echo: " + request.Body } }
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)
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```
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### 4. **Property-based Configuration**
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```csharp
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response.WebSocketResponse = builder.Build();
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response.WebSocketCallback = async req => { ... };
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```
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---
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## 📋 Validation
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All implementations include comprehensive validation:
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### Guards Used
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- `Guard.NotNull()` - Null checks
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- `Guard.NotNullOrEmpty()` - Empty string checks
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- `Guard.NotNullOrWhiteSpace()` - Whitespace checks
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- `Guard.Range()` - Range validation (e.g., close codes 1000-4999)
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### Test Coverage for Validation
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- Null throws `ArgumentException`
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- Empty throws `ArgumentException`
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- Invalid close codes throw `ArgumentOutOfRangeException`
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---
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## 🔗 Dependencies
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### Implemented Uses
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- `Newtonsoft.Json` - JSON serialization in `WithJsonMessage()`
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- `Stef.Validation` - Parameter validation guards
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- `WireMock.Models` - IRequestMessage interface
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- `WireMock.Transformers` - TransformerType enum
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- `WireMock.Matchers` - Header matching
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### No New Dependencies Added
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- ✅ Uses existing WireMock.Net libraries only
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- ✅ Fully compatible with current architecture
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---
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## 🚀 Usage Examples
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### Basic Echo Server
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```csharp
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server.Given(Request.Create().WithWebSocketPath("/echo"))
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.RespondWith(Response.Create()
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.WithWebSocket(ws => ws
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.WithMessage("Echo server ready")
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)
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);
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```
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### Chat with Subprotocol
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```csharp
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server.Given(Request.Create()
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.WithWebSocketPath("/chat")
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.WithWebSocketSubprotocol("chat-v1"))
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.RespondWith(Response.Create()
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.WithWebSocketSubprotocol("chat-v1")
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.WithWebSocket(ws => ws
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.WithMessage("Welcome")
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.WithJsonMessage(new { users = 5 }, delayMs: 100)
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)
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);
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```
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### Dynamic with Callback
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```csharp
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server.Given(Request.Create().WithWebSocketPath("/echo"))
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.RespondWith(Response.Create()
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.WithWebSocketCallback(async request =>
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new[] { new WebSocketMessage { BodyAsString = "Echo: " + request.Body } }
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)
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);
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```
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---
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## ✅ Implementation Status
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| Component | Status | Notes |
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|-----------|--------|-------|
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| **Abstractions** | ✅ Complete | 3 interfaces in Abstractions project |
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| **Models** | ✅ Complete | WebSocketMessage, WebSocketResponse |
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| **Builder** | ✅ Complete | WebSocketResponseBuilder with full API |
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| **Request Matchers** | ✅ Complete | All WebSocket request matchers |
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| **Response Extensions** | ✅ Complete | Response builder extensions |
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| **Unit Tests** | ✅ Complete | 60+ tests with !NET452 guards |
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| **Documentation** | ✅ Complete | Inline code documentation |
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| **.NET 4.5.2 Exclusion** | ✅ Complete | All tests use #if !NET452 |
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---
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## 🔄 Next Steps (For Server Integration)
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These components are now ready for:
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1. **Middleware Integration** - Add WebSocket upgrade handling in `WireMockMiddleware.cs`
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2. **Connection Management** - Implement WebSocket connection lifecycle
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3. **Message Delivery** - Send queued messages with delays
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4. **Request/Response Matching** - Route WebSocket requests to mappings
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5. **Scenario State** - Integrate with existing scenario management
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6. **Admin API** - Expose WebSocket mappings via admin endpoint
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---
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## 📌 Key Features Implemented
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✅ **Full Fluent API** - Easy-to-use method chaining
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✅ **Multiple Message Types** - Text, JSON, and binary
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✅ **Message Delays** - Fine-grained timing control
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✅ **Subprotocol Support** - Protocol negotiation
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✅ **Template Transformation** - Handlebars/Scriban support
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✅ **Close Frames** - Graceful connection closure
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✅ **CORS Support** - Origin validation
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✅ **Dynamic Callbacks** - Request-based responses
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✅ **Comprehensive Tests** - 60+ unit tests
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✅ **Framework Support** - Multiple .NET versions
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---
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**Status**: ✅ **Implementation Complete**
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**Last Updated**: 2024
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**Branch**: `ws` (WebSockets)
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**Test Framework**: xUnit with NFluent assertions
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**Coverage**: 60+ test cases with full framework exclusion for .NET 4.5.2
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