WASM MCP Server

# WASM MCP Server Components Documentation This document provides detailed information about each major component in the WASM MCP Server implementation. ## Core Components ### 1. MCP Server (`server.ts`) **Purpose:** The core server implementation that handles tool registration, resource management, and request processing. **Key Responsibilities:** - Server initialization and configuration - Tool and resource registration - Schema validation - Request handling - Response formatting **Implementation Details:** ```typescript export function createServer(): McpServer { const server = new McpServer({ name: "WASM MCP Server", version: "1.0.0" }); // ... tool and resource registration } ``` **Key Features:** - Singleton server instance - Tool registration with schema validation - Resource template handling - In-memory storage management - Error handling and validation **Initialization Flow:** 1. Create server instance 2. Register calculator tool 3. Register storage resource 4. Register storage tool 5. Initialize internal storage 6. Return configured server ### 2. Client Integration (`main.ts`) **Purpose:** Handles client-side integration, UI interactions, and server communication. **Key Responsibilities:** - Server initialization in browser - UI event handling - Tool execution - Resource access - Error display - State management **Component Structure:** ``` - Environment Setup ├── Transport initialization ├── Server creation └── Connection establishment - Calculator Integration ├── UI initialization ├── Event handlers ├── Input validation └── Result display - Storage Integration ├── UI initialization ├── Set/Get handlers ├── Key/Value management └── Status display ``` **Implementation Flow:** ```typescript // 1. Environment Setup async function setupEnvironment() { const transport = new BrowserTransport(); await transport.start(); const server = createServer(); await server.connect(transport); return { server, transport }; } // 2. Calculator Integration async function initializeCalculator(transport: BrowserTransport) { // Set up event handlers for calculator UI // Handle calculations through transport // Display results/errors } // 3. Storage Integration async function initializeStorage(transport: BrowserTransport) { // Set up event handlers for storage UI // Handle set/get operations // Display results/errors } // 4. Main Initialization async function main() { const { transport } = await setupEnvironment(); await initializeCalculator(transport); await initializeStorage(transport); } ``` **Error Handling:** - Transport connection errors - Tool execution errors - Resource access errors - Input validation - UI element initialization - Message handling errors **State Management:** - Single transport instance shared across components - Isolated UI component initialization - Independent error handling per component - Asynchronous operation handling ### 3. Browser Transport (`browser-transport.ts`) **Purpose:** Provides communication layer between the client and WASM server. **Key Responsibilities:** - Message passing - Event handling - Connection management - Error handling **Implementation Details:** ```typescript export class BrowserTransport { private connected: boolean = false; async start() { // Initialize transport } async send(message: any) { // Send message to server } onMessage(callback: (message: any) => void) { // Handle incoming messages } } ``` **Message Flow:** 1. Client initiates request 2. Transport serializes message 3. WASM server processes request 4. Response returned via transport 5. Client receives and processes response ### 4. UI Components **Calculator Interface:** ```html <div class="calculator"> <select id="operation"> <option value="add">Add</option> <option value="subtract">Subtract</option> <option value="multiply">Multiply</option> <option value="divide">Divide</option> </select> <input type="number" id="num1"> <input type="number" id="num2"> <button onclick="calculate()">Calculate</button> <div id="calcOutput" class="output"></div> </div> ``` **Storage Interface:** ```html <div class="storage"> <input type="text" id="storageKey" placeholder="Key"> <input type="text" id="storageValue" placeholder="Value"> <button onclick="setStorage()">Set Storage</button> <button onclick="getStorage()">Get Storage</button> <div id="storageOutput" class="output"></div> </div> ``` ## Integration Points ### 1. Server-Transport Integration **Connection Setup:** ```typescript const transport = new BrowserTransport(); await transport.start(); mcpServer = createServer(); await mcpServer.connect(transport); ``` **Message Handling:** ```typescript transport.onMessage(async (message) => { // Process incoming messages const response = await processMessage(message); transport.send(response); }); ``` ### 2. Tool-Server Integration **Tool Registration:** ```typescript server.tool( "calculate", schema, async (params) => { // Tool implementation return response; } ); ``` **Tool Execution:** ```typescript const result = await toolHandler.callback({ operation: "add", a: 5, b: 3 }); ``` ### 3. Resource-Server Integration **Resource Registration:** ```typescript server.resource( "storage", "storage://{key}", async (uri, params) => { // Resource implementation return response; } ); ``` **Resource Access:** ```typescript const uri = new URL(`storage://${key}`); const result = await resourceHandler.readCallback(uri, { key }); ``` ## Development Considerations ### 1. Type Safety - Use TypeScript for type checking - Define interfaces for messages - Validate schemas using Zod - Handle type conversions ### 2. Error Handling - Graceful degradation - User-friendly error messages - Console logging for debugging - Error recovery strategies ### 3. Performance - Minimize message size - Batch operations when possible - Efficient state management - Resource cleanup ### 4. Security - Input validation - Sanitization - Scope limitation - Error message safety ## Testing Considerations ### 1. Unit Tests - Tool functionality - Resource access - Schema validation - Error handling ### 2. Integration Tests - Server-transport communication - Tool-resource interaction - UI-server integration - Error propagation ### 3. End-to-End Tests - Complete workflows - Edge cases - Error scenarios - Performance metrics ## Future Enhancements ### 1. Component Improvements - Enhanced error handling - Better type safety - Performance optimizations - Additional tools and resources ### 2. Architecture Improvements - Modular design - Plugin system - Caching layer - State management ### 3. UI Improvements - Better error display - Loading states - Input validation - Responsive design