feat: session manager

internal/session/manager.go

@@ -0,0 +1,88 @@
+package session
+
+import (
+	"context"
+	"sync"
+
+	"github.com/opencode-ai/opencode/internal/logging"
+	"github.com/opencode-ai/opencode/internal/pubsub"
+)
+
+// Manager handles session management, tracking the currently active session.
+type Manager struct {
+	currentSessionID string
+	service          Service
+	mu               sync.RWMutex
+}
+
+// Global instance of the session manager
+var globalManager *Manager
+
+// InitManager initializes the global session manager with the provided service.
+func InitManager(service Service) {
+	globalManager = &Manager{
+		currentSessionID: "",
+		service:          service,
+	}
+
+	// Subscribe to session events to handle session deletions
+	go func() {
+		ctx := context.Background()
+		eventCh := service.Subscribe(ctx)
+		for event := range eventCh {
+			if event.Type == pubsub.DeletedEvent && event.Payload.ID == CurrentSessionID() {
+				// If the current session is deleted, clear the current session
+				SetCurrentSession("")
+			}
+		}
+	}()
+}
+
+// SetCurrentSession changes the active session to the one with the specified ID.
+func SetCurrentSession(sessionID string) {
+	if globalManager == nil {
+		logging.Warn("Session manager not initialized")
+		return
+	}
+
+	globalManager.mu.Lock()
+	defer globalManager.mu.Unlock()
+
+	globalManager.currentSessionID = sessionID
+	logging.Debug("Current session changed", "sessionID", sessionID)
+}
+
+// CurrentSessionID returns the ID of the currently active session.
+func CurrentSessionID() string {
+	if globalManager == nil {
+		logging.Warn("Session manager not initialized")
+		return ""
+	}
+
+	globalManager.mu.RLock()
+	defer globalManager.mu.RUnlock()
+
+	return globalManager.currentSessionID
+}
+
+// CurrentSession returns the currently active session.
+// If no session is set or the session cannot be found, it returns nil.
+func CurrentSession() *Session {
+	if globalManager == nil {
+		logging.Warn("Session manager not initialized")
+		return nil
+	}
+
+	sessionID := CurrentSessionID()
+	if sessionID == "" {
+		return nil
+	}
+
+	session, err := globalManager.service.Get(context.Background(), sessionID)
+	if err != nil {
+		logging.Warn("Failed to get current session", "err", err)
+		return nil
+	}
+
+	return &session
+}