Add graceful shutdown

cmd/gateway/main.go

@@ -9,6 +9,8 @@ import (
 	"log/slog"
 	"net/http"
 	"os"
+	"os/signal"
+	"syscall"
 	"time"
 
 	_ "github.com/go-sql-driver/mysql"
@@ -120,11 +122,45 @@ func main() {
 		IdleTimeout:  120 * time.Second,
 	}
 
+	// Set up signal handling for graceful shutdown
+	sigChan := make(chan os.Signal, 1)
+	signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
+
+	// Run server in a goroutine
+	serverErrors := make(chan error, 1)
+	go func() {
 		logger.Info("open responses gateway listening", slog.String("address", addr))
-	if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		serverErrors <- srv.ListenAndServe()
+	}()
+
+	// Wait for shutdown signal or server error
+	select {
+	case err := <-serverErrors:
+		if err != nil && err != http.ErrServerClosed {
 			logger.Error("server error", slog.String("error", err.Error()))
 			os.Exit(1)
 		}
+	case sig := <-sigChan:
+		logger.Info("received shutdown signal", slog.String("signal", sig.String()))
+
+		// Create shutdown context with timeout
+		shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 30*time.Second)
+		defer shutdownCancel()
+
+		// Shutdown the HTTP server gracefully
+		logger.Info("shutting down server gracefully")
+		if err := srv.Shutdown(shutdownCtx); err != nil {
+			logger.Error("server shutdown error", slog.String("error", err.Error()))
+		}
+
+		// Close conversation store
+		logger.Info("closing conversation store")
+		if err := convStore.Close(); err != nil {
+			logger.Error("error closing conversation store", slog.String("error", err.Error()))
+		}
+
+		logger.Info("shutdown complete")
+	}
 }
 
 func initConversationStore(cfg config.ConversationConfig, logger *slog.Logger) (conversation.Store, error) {

internal/conversation/conversation.go

@@ -14,6 +14,7 @@ type Store interface {
 	Append(id string, messages ...api.Message) (*Conversation, error)
 	Delete(id string) error
 	Size() int
+	Close() error
 }
 
 // MemoryStore manages conversation history in-memory with automatic expiration.
@@ -21,6 +22,7 @@ type MemoryStore struct {
 	conversations map[string]*Conversation
 	mu            sync.RWMutex
 	ttl           time.Duration
+	done          chan struct{}
 }
 
 // Conversation holds the message history for a single conversation thread.
@@ -37,6 +39,7 @@ func NewMemoryStore(ttl time.Duration) *MemoryStore {
 	s := &MemoryStore{
 		conversations: make(map[string]*Conversation),
 		ttl:           ttl,
+		done:          make(chan struct{}),
 	}
 
 	// Start cleanup goroutine if TTL is set
@@ -141,7 +144,9 @@ func (s *MemoryStore) cleanup() {
 	ticker := time.NewTicker(1 * time.Minute)
 	defer ticker.Stop()
 
-	for range ticker.C {
+	for {
+		select {
+		case <-ticker.C:
 			s.mu.Lock()
 			now := time.Now()
 			for id, conv := range s.conversations {
@@ -150,6 +155,9 @@ func (s *MemoryStore) cleanup() {
 				}
 			}
 			s.mu.Unlock()
+		case <-s.done:
+			return
+		}
 	}
 }
 
@@ -159,3 +167,9 @@ func (s *MemoryStore) Size() int {
 	defer s.mu.RUnlock()
 	return len(s.conversations)
 }
+
+// Close stops the cleanup goroutine and releases resources.
+func (s *MemoryStore) Close() error {
+	close(s.done)
+	return nil
+}

internal/conversation/redis_store.go

@@ -122,3 +122,8 @@ func (s *RedisStore) Size() int {
 
 	return count
 }
+
+// Close closes the Redis client connection.
+func (s *RedisStore) Close() error {
+	return s.client.Close()
+}

internal/conversation/sql_store.go

@@ -41,6 +41,7 @@ type SQLStore struct {
 	db      *sql.DB
 	ttl     time.Duration
 	dialect sqlDialect
+	done    chan struct{}
 }
 
 // NewSQLStore creates a SQL-backed conversation store. It creates the
@@ -58,7 +59,12 @@ func NewSQLStore(db *sql.DB, driver string, ttl time.Duration) (*SQLStore, error
 		return nil, err
 	}
 
-	s := &SQLStore{db: db, ttl: ttl, dialect: newDialect(driver)}
+	s := &SQLStore{
+		db:      db,
+		ttl:     ttl,
+		dialect: newDialect(driver),
+		done:    make(chan struct{}),
+	}
 	if ttl > 0 {
 		go s.cleanup()
 	}
@@ -144,8 +150,19 @@ func (s *SQLStore) cleanup() {
 	ticker := time.NewTicker(1 * time.Minute)
 	defer ticker.Stop()
 
-	for range ticker.C {
+	for {
+		select {
+		case <-ticker.C:
 			cutoff := time.Now().Add(-s.ttl)
 			_, _ = s.db.Exec(s.dialect.cleanup, cutoff)
+		case <-s.done:
+			return
+		}
 	}
 }
+
+// Close stops the cleanup goroutine and closes the database connection.
+func (s *SQLStore) Close() error {
+	close(s.done)
+	return s.db.Close()
+}

internal/server/mocks_test.go

@@ -220,6 +220,10 @@ func (m *mockConversationStore) Size() int {
 	return len(m.conversations)
 }
 
+func (m *mockConversationStore) Close() error {
+	return nil
+}
+
 func (m *mockConversationStore) setConversation(id string, conv *conversation.Conversation) {
 	m.mu.Lock()
 	defer m.mu.Unlock()