194 lines
6.6 KiB
Go
194 lines
6.6 KiB
Go
// 功能描述：用户购物车读取及带版本条件的幂等数量设置；版本：1.0.0。
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package user
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import (
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"errors"
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"time"
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"git.apinb.com/bsm-sdk/core/errcode"
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"git.apinb.com/bsm-sdk/core/infra"
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"git.apinb.com/heqiapp/platforms/backend/api/internal/impl"
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common "git.apinb.com/heqiapp/platforms/backend/api/internal/logic/common"
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"git.apinb.com/heqiapp/platforms/backend/api/internal/models"
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"github.com/gin-gonic/gin"
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"gorm.io/gorm"
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"gorm.io/gorm/clause"
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)
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var errCartChanged = errcode.NewError(2403, "购物车已变化，请刷新后重新确认")
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// productCoverURL 返回商品当前封面；订单创建时会把它固化到成交快照。
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func productCoverURL(db *gorm.DB, productID uint64) (string, error) {
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var picture models.EcProductImage
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if err := db.Where("ec_product_id = ? AND status = ?", productID, common.StatusEnable).
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Order("is_cover desc, sort_no, identity").Find(&picture).Error; err != nil {
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return "", err
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}
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return picture.ImageURI, nil
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}
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// cartRevision 返回公开并发版本，不向客户端暴露数据库主键。
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func cartRevision(item models.EcCart) string {
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if item.ID == 0 {
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return ""
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}
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// PostgreSQL 时间戳精度为微秒，响应必须与重读后的版本一致。
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return item.Identity + ":" + item.UpdatedAt.UTC().Truncate(time.Microsecond).Format(time.RFC3339Nano)
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}
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// cartValue 仅展示关联商品和本人的购物状态；下架商品仍保留可删除条目。
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func cartValue(db *gorm.DB, item models.EcCart, product models.EcProduct) (gin.H, error) {
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quantity := item.Quantity
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if item.ID == 0 || item.Status == common.StatusArchived {
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quantity = 0
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}
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imageURL, err := productCoverURL(db, product.ID)
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if err != nil {
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return nil, err
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}
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return gin.H{
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"product_identity": product.Identity, "name": product.Name, "image_url": imageURL,
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"price_amount": product.PriceAmount, "stock_quantity": product.StockQuantity,
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"available": product.Status == common.StatusEnable && !product.DeletedAt.Valid && product.StockQuantity > 0,
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"quantity": quantity, "selected": quantity > 0 && item.Selected, "revision": cartRevision(item),
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}, nil
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}
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// ListCart 返回本人未归档条目，失效商品不会被静默移除。
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func ListCart(ctx *gin.Context) {
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account, ok := common.UserAccount(ctx)
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if !ok {
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return
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}
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var items []models.EcCart
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if err := impl.DBService.Where("user_account_id = ? AND status <> ?", account.ID, common.StatusArchived).
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Order("created_at, identity").Find(&items).Error; err != nil {
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infra.Response.Error(ctx, err)
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return
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}
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result := make([]gin.H, 0, len(items))
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for _, item := range items {
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var product models.EcProduct
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if err := impl.DBService.Unscoped().Where("id = ?", item.EcProductID).Take(&product).Error; err != nil {
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infra.Response.Error(ctx, err)
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return
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}
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value, err := cartValue(impl.DBService, item, product)
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if err != nil {
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infra.Response.Error(ctx, err)
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return
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}
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result = append(result, value)
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}
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infra.Response.Success(ctx, result)
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}
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// GetCartItem 返回本商品当前数量和归档版本，重新加入时不会覆盖另一端的操作。
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func GetCartItem(ctx *gin.Context) {
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account, ok := common.UserAccount(ctx)
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if !ok {
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return
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}
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var product models.EcProduct
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if err := impl.DBService.Where("identity = ?", ctx.Param("identity")).Take(&product).Error; err != nil {
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infra.Response.Error(ctx, errcode.ErrRecordNotFound)
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return
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}
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var item models.EcCart
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if err := impl.DBService.Where("user_account_id = ? AND ec_product_id = ?", account.ID, product.ID).Find(&item).Error; err != nil {
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infra.Response.Error(ctx, err)
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return
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}
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value, err := cartValue(impl.DBService, item, product)
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if err != nil {
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infra.Response.Error(ctx, err)
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return
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}
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infra.Response.Success(ctx, value)
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}
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// SetCartItem 以绝对数量写入；同目标重试无副作用，过期版本拒绝覆盖，数量零表示归档。
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func SetCartItem(ctx *gin.Context) {
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account, ok := common.UserAccount(ctx)
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if !ok {
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return
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}
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var request struct {
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Quantity *int `json:"quantity" binding:"required,gte=0,lte=999"`
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Selected *bool `json:"selected" binding:"required"`
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Revision string `json:"revision" binding:"max=128"`
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}
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if ctx.ShouldBindJSON(&request) != nil {
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infra.Response.Error(ctx, errcode.ErrInvalidArgument)
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return
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}
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var result gin.H
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err := impl.DBService.Transaction(func(tx *gorm.DB) error {
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// 所有用户端购物车写入共用账户行锁，无需改动现有远程表结构。
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var owner models.UserAccount
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if err := tx.Clauses(clause.Locking{Strength: "UPDATE"}).Where("id = ?", account.ID).Take(&owner).Error; err != nil {
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return err
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}
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var product models.EcProduct
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if err := tx.Unscoped().Where("identity = ?", ctx.Param("identity")).Take(&product).Error; err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return errcode.ErrRecordNotFound
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}
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return err
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}
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var item models.EcCart
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if err := tx.Where("user_account_id = ? AND ec_product_id = ?", account.ID, product.ID).Find(&item).Error; err != nil {
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return err
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}
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current := item.Quantity
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if item.ID == 0 || item.Status == common.StatusArchived {
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current = 0
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}
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same := current == *request.Quantity && (current == 0 || item.Selected == *request.Selected)
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if !same {
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if cartRevision(item) != request.Revision {
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return errCartChanged
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}
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if *request.Quantity > 0 && (*request.Quantity > current || current == 0) &&
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(product.Status != common.StatusEnable || product.DeletedAt.Valid || product.StockQuantity < *request.Quantity) {
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return errShopStockChanged
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}
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status := common.StatusEnable
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if *request.Quantity == 0 {
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status = common.StatusArchived
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}
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if current == 0 {
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var count int64
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if err := tx.Model(&models.EcCart{}).Where("user_account_id = ? AND status <> ?", account.ID, common.StatusArchived).Count(&count).Error; err != nil {
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return err
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}
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if count >= 100 {
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return errcode.ErrOutOfRange
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}
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}
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if item.ID == 0 {
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item = models.EcCart{Entity: common.NewEntity(status), UserAccountID: account.ID, EcProductID: product.ID, Quantity: *request.Quantity, Selected: true}
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if err := tx.Create(&item).Error; err != nil {
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return err
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}
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}
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// 保留正数量以兼容现有 CHECK；归档状态对外显示零。
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quantity := *request.Quantity
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if quantity == 0 {
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quantity = item.Quantity
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}
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if err := tx.Model(&item).Updates(map[string]any{"quantity": quantity, "selected": *request.Selected, "status": status}).Error; err != nil {
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return err
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}
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}
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var err error
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result, err = cartValue(tx, item, product)
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return err
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})
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if err != nil {
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infra.Response.Error(ctx, err)
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return
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}
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infra.Response.Success(ctx, result)
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}
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