first commit

server/internal/backup/retention/service.go

@@ -0,0 +1,82 @@
+package retention
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"time"
+
+	"backupx/server/internal/model"
+	"backupx/server/internal/repository"
+	"backupx/server/internal/storage"
+)
+
+type CleanupResult struct {
+	DeletedRecords int
+	DeletedObjects int
+	Warnings       []string
+}
+
+type Service struct {
+	records repository.BackupRecordRepository
+	now     func() time.Time
+}
+
+func NewService(records repository.BackupRecordRepository) *Service {
+	return &Service{records: records, now: func() time.Time { return time.Now().UTC() }}
+}
+
+func (s *Service) Cleanup(ctx context.Context, task *model.BackupTask, provider storage.StorageProvider) (*CleanupResult, error) {
+	if task == nil {
+		return nil, fmt.Errorf("backup task is required")
+	}
+	records, err := s.records.ListSuccessfulByTask(ctx, task.ID)
+	if err != nil {
+		return nil, fmt.Errorf("list successful records: %w", err)
+	}
+	candidates := selectRecordsToDelete(records, task.RetentionDays, task.MaxBackups, s.now())
+	result := &CleanupResult{}
+	for _, record := range candidates {
+		if strings.TrimSpace(record.StoragePath) != "" {
+			if provider == nil {
+				result.Warnings = append(result.Warnings, fmt.Sprintf("record %d missing storage provider for cleanup", record.ID))
+				continue
+			}
+			if err := provider.Delete(ctx, record.StoragePath); err != nil {
+				result.Warnings = append(result.Warnings, fmt.Sprintf("delete storage object %s failed: %v", record.StoragePath, err))
+				continue
+			}
+			result.DeletedObjects++
+		}
+		if err := s.records.Delete(ctx, record.ID); err != nil {
+			result.Warnings = append(result.Warnings, fmt.Sprintf("delete backup record %d failed: %v", record.ID, err))
+			continue
+		}
+		result.DeletedRecords++
+	}
+	return result, nil
+}
+
+func selectRecordsToDelete(records []model.BackupRecord, retentionDays int, maxBackups int, now time.Time) []model.BackupRecord {
+	selected := make(map[uint]model.BackupRecord)
+	if maxBackups > 0 && len(records) > maxBackups {
+		for _, record := range records[maxBackups:] {
+			selected[record.ID] = record
+		}
+	}
+	if retentionDays > 0 {
+		cutoff := now.AddDate(0, 0, -retentionDays)
+		for _, record := range records {
+			if record.CompletedAt != nil && record.CompletedAt.Before(cutoff) {
+				selected[record.ID] = record
+			}
+		}
+	}
+	result := make([]model.BackupRecord, 0, len(selected))
+	for _, record := range records {
+		if selectedRecord, ok := selected[record.ID]; ok {
+			result = append(result, selectedRecord)
+		}
+	}
+	return result
+}