5 分钟发布一次

backend/internal/modules/listing/mutation.go

@@ -11,12 +11,17 @@ import (
 
 	"gorm.io/datatypes"
 	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
 )
 
-func (r *Repository) Create(ctx context.Context, ownerID uint64, req CreateRequest, reviewRequired bool) (*ListingDTO, error) {
+func (r *Repository) Create(ctx context.Context, ownerID uint64, req CreateRequest, reviewRequired bool, publishCooldown time.Duration) (*ListingDTO, error) {
 	var dto *ListingDTO
 	err := r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
-		listingNo, err := r.nextListingNo(tx, time.Now())
+		now := time.Now()
+		if err := r.ensureCreateCooldown(tx, ownerID, publishCooldown, now); err != nil {
+			return err
+		}
+		listingNo, err := r.nextListingNo(tx, now)
 		if err != nil {
 			return err
 		}
@@ -77,6 +82,33 @@ func (r *Repository) Create(ctx context.Context, ownerID uint64, req CreateReque
 	return dto, err
 }
 
+func (r *Repository) ensureCreateCooldown(tx *gorm.DB, ownerID uint64, cooldown time.Duration, now time.Time) error {
+	if cooldown <= 0 {
+		return nil
+	}
+
+	var user model.User
+	if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Select("id").First(&user, ownerID).Error; err != nil {
+		return err
+	}
+
+	var latest model.RentalListing
+	err := tx.Where("owner_id = ?", ownerID).
+		Order("created_at DESC, id DESC").
+		First(&latest).Error
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil
+		}
+		return err
+	}
+	remaining := latest.CreatedAt.Add(cooldown).Sub(now)
+	if remaining > 0 {
+		return PublishCooldownError{Cooldown: cooldown, Remaining: remaining}
+	}
+	return nil
+}
+
 type externalUploadCreate struct {
 	UploaderName     string
 	ClientUploadTime *time.Time