first commit

server/internal/service/retention_service.go

@@ -0,0 +1,71 @@
+package service
+
+import (
+	"context"
+	"time"
+
+	"backupx/server/internal/model"
+	"backupx/server/internal/repository"
+	"backupx/server/internal/storage"
+	"backupx/server/internal/storage/codec"
+)
+
+type RetentionService struct {
+	records         repository.BackupRecordRepository
+	storageTargets  repository.StorageTargetRepository
+	storageRegistry *storage.Registry
+	cipher          *codec.ConfigCipher
+}
+
+func NewRetentionService(records repository.BackupRecordRepository, storageTargets repository.StorageTargetRepository, storageRegistry *storage.Registry, cipher *codec.ConfigCipher) *RetentionService {
+	return &RetentionService{records: records, storageTargets: storageTargets, storageRegistry: storageRegistry, cipher: cipher}
+}
+
+func (s *RetentionService) Apply(ctx context.Context, task *model.BackupTask) error {
+	if task == nil || (task.RetentionDays <= 0 && task.MaxBackups <= 0) {
+		return nil
+	}
+	items, err := s.records.ListSuccessfulByTask(ctx, task.ID)
+	if err != nil {
+		return err
+	}
+	removeSet := make(map[uint]model.BackupRecord)
+	if task.RetentionDays > 0 {
+		cutoff := time.Now().UTC().AddDate(0, 0, -task.RetentionDays)
+		for _, item := range items {
+			if item.CompletedAt != nil && item.CompletedAt.Before(cutoff) {
+				removeSet[item.ID] = item
+			}
+		}
+	}
+	if task.MaxBackups > 0 {
+		kept := 0
+		for _, item := range items {
+			if _, marked := removeSet[item.ID]; marked {
+				continue
+			}
+			kept++
+			if kept > task.MaxBackups {
+				removeSet[item.ID] = item
+			}
+		}
+	}
+	if len(removeSet) == 0 {
+		return nil
+	}
+	provider, _, err := buildStorageProviderFromRepos(ctx, task.StorageTargetID, s.storageTargets, s.storageRegistry, s.cipher)
+	if err != nil {
+		return err
+	}
+	for _, item := range removeSet {
+		if item.StoragePath != "" {
+			if err := provider.Delete(ctx, item.StoragePath); err != nil {
+				return err
+			}
+		}
+		if err := s.records.Delete(ctx, item.ID); err != nil {
+			return err
+		}
+	}
+	return nil
+}