initial commit

internal/infrastructure/session/file_storage.go

@@ -0,0 +1,74 @@
+package session
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/paramah/ai_devs4/s01e03/internal/domain"
+)
+
+// FileStorage implements domain.SessionStorage using JSON files
+type FileStorage struct {
+	baseDir string
+}
+
+// NewFileStorage creates a new file-based session storage
+func NewFileStorage(baseDir string) *FileStorage {
+	return &FileStorage{
+		baseDir: baseDir,
+	}
+}
+
+// Get retrieves a session from file storage
+func (s *FileStorage) Get(ctx context.Context, sessionID string) (*domain.Session, error) {
+	filePath := s.getFilePath(sessionID)
+
+	// Check if file exists
+	if _, err := os.Stat(filePath); os.IsNotExist(err) {
+		// Return empty session if file doesn't exist
+		return &domain.Session{
+			ID:       sessionID,
+			Messages: []domain.Message{},
+		}, nil
+	}
+
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		return nil, fmt.Errorf("reading session file: %w", err)
+	}
+
+	var session domain.Session
+	if err := json.Unmarshal(data, &session); err != nil {
+		return nil, fmt.Errorf("unmarshaling session: %w", err)
+	}
+
+	return &session, nil
+}
+
+// Save saves a session to file storage
+func (s *FileStorage) Save(ctx context.Context, session *domain.Session) error {
+	filePath := s.getFilePath(session.ID)
+
+	// Ensure directory exists
+	if err := os.MkdirAll(s.baseDir, 0755); err != nil {
+		return fmt.Errorf("creating cache directory: %w", err)
+	}
+
+	data, err := json.MarshalIndent(session, "", "  ")
+	if err != nil {
+		return fmt.Errorf("marshaling session: %w", err)
+	}
+
+	if err := os.WriteFile(filePath, data, 0644); err != nil {
+		return fmt.Errorf("writing session file: %w", err)
+	}
+
+	return nil
+}
+
+func (s *FileStorage) getFilePath(sessionID string) string {
+	return filepath.Join(s.baseDir, fmt.Sprintf("%s.json", sessionID))
+}