todo.md

Golang Codebase Review and Recommendations

Since I don't have direct access to your codebase, I'll provide general recommendations based on Go best practices and the architectural guidelines in your cursor rules. These suggestions focus on SSE connections, server initialization, and applicable design patterns.

Keeping SSE Connections Alive

For persistent SSE connections:

1. Context Management

   func handleSSE(w http.ResponseWriter, r *http.Request) {
       // Set headers for SSE
       w.Header().Set("Content-Type", "text/event-stream")
       w.Header().Set("Cache-Control", "no-cache")
       w.Header().Set("Connection", "keep-alive")
   
       // Create a context that doesn't automatically cancel
       ctx, cancel := context.WithCancel(context.Background())
       defer cancel()
   
       // Handle client disconnection
       notify := r.Context().Done()
       go func() {
           <-notify
           cancel()
       }()
   
       // Keep-alive mechanism
       ticker := time.NewTicker(30 * time.Second)
       defer ticker.Stop()
   
       flusher, ok := w.(http.Flusher)
       if !ok {
           http.Error(w, "Streaming not supported", http.StatusInternalServerError)
           return
       }
   
       for {
           select {
           case <-ctx.Done():
               return
           case <-ticker.C:
               // Send keep-alive message
               fmt.Fprintf(w, "event: ping\ndata: %s\n\n", time.Now().String())
               flusher.Flush()
           case event := <-eventChannel:
               // Send actual event data
               fmt.Fprintf(w, "event: message\ndata: %s\n\n", event)
               flusher.Flush()
           }
       }
   }

2. Connection Pool Pattern

   • Implement a registry for active SSE connections
   • Allows graceful shutdown and broadcasting to all clients

Simplifying MCP Server Initialization

Apply these design patterns for easier server initialization:

1. Builder Pattern

   type MCPServerBuilder struct {
       server *MCPServer
   }
   
   func NewMCPServerBuilder() *MCPServerBuilder {
       return &MCPServerBuilder{
           server: &MCPServer{
               // Default values
               port: 8080,
           },
       }
   }
   
   func (b *MCPServerBuilder) WithPort(port int) *MCPServerBuilder {
       b.server.port = port
       return b
   }
   
   func (b *MCPServerBuilder) WithDatabase(db *Database) *MCPServerBuilder {
       b.server.db = db
       return b
   }
   
   func (b *MCPServerBuilder) WithLogger(logger Logger) *MCPServerBuilder {
       b.server.logger = logger
       return b
   }
   
   func (b *MCPServerBuilder) Build() (*MCPServer, error) {
       // Validate configurations
       if b.server.db == nil {
           return nil, errors.New("database is required")
       }
   
       // Additional setup/initialization
       return b.server, nil
   }

2. Functional Options Pattern

   type MCPServerOption func(*MCPServer)
   
   func WithPort(port int) MCPServerOption {
       return func(s *MCPServer) {
           s.port = port
       }
   }
   
   func WithLogger(logger Logger) MCPServerOption {
       return func(s *MCPServer) {
           s.logger = logger
       }
   }
   
   func NewMCPServer(options ...MCPServerOption) *MCPServer {
       server := &MCPServer{
           // Default values
           port: 8080,
           logger: DefaultLogger{},
       }
   
       // Apply all options
       for _, option := range options {
           option(server)
       }
   
       return server
   }
   
   // Usage
   // server := NewMCPServer(WithPort(9000), WithLogger(customLogger))

General Refactoring Recommendations

1. Dependency Injection

   • Use constructor injection for dependencies
   • Define interfaces at the point of use, not implementation

2. Repository Pattern Improvements

   • Abstract database operations behind repository interfaces
   • Use factory methods to create repositories

   type UserRepositoryFactory interface {
       CreateRepository(ctx context.Context) (UserRepository, error)
   }

3. Use Context Propagation

   • Ensure contexts are properly passed through all layers
   • Add timeouts at appropriate boundaries

4. Circuit Breaker Pattern for External Services

   type CircuitBreaker struct {
       failureThreshold int
       resetTimeout     time.Duration
       failures         int
       lastFailure      time.Time
       state            string // "closed", "open", "half-open"
       mu               sync.Mutex
   }

5. Command Pattern for Operations

   • Encapsulate operations as command objects
   • Enables undo/redo, logging, and queuing

6. Implement Graceful Shutdown

   func (s *Server) Start() error {
       // Server configuration
       srv := &http.Server{
           Addr:    fmt.Sprintf(":%d", s.port),
           Handler: s.router,
       }
   
       // Channel to listen for errors coming from the listener
       serverErrors := make(chan error, 1)
   
       // Start the server
       go func() {
           serverErrors <- srv.ListenAndServe()
       }()
   
       // Channel for listening to OS signals
       osSignals := make(chan os.Signal, 1)
       signal.Notify(osSignals, os.Interrupt, syscall.SIGTERM)
   
       // Block until an OS signal or an error is received
       select {
       case err := <-serverErrors:
           return fmt.Errorf("server error: %w", err)
   
       case <-osSignals:
           // Graceful shutdown
           ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
           defer cancel()
   
           if err := srv.Shutdown(ctx); err != nil {
               // If shutdown times out, force close
               if err := srv.Close(); err != nil {
                   return fmt.Errorf("could not stop server: %w", err)
               }
               return fmt.Errorf("could not gracefully stop server: %w", err)
           }
       }
   
       return nil
   }

For more specific advice, I'd need to see your actual code. Consider using agent mode to allow me to analyze your specific codebase and provide more targeted recommendations.