Complete refactor to new grpc control plane and only http proxy for carts (#4)
Co-authored-by: matst80 <mats.tornberg@gmail.com> Reviewed-on: https://git.tornberg.me/mats/go-cart-actor/pulls/4 Co-authored-by: Mats Törnberg <mats@tornberg.me> Co-committed-by: Mats Törnberg <mats@tornberg.me>
This commit was merged in pull request #4.
This commit is contained in:
268
cmd/cart/cart-grain.go
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268
cmd/cart/cart-grain.go
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package main
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import (
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"encoding/json"
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"fmt"
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"slices"
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"sync"
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"time"
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messages "git.tornberg.me/go-cart-actor/pkg/messages"
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"git.tornberg.me/go-cart-actor/pkg/voucher"
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)
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// Legacy padded [16]byte CartId and its helper methods removed.
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// Unified CartId (uint64 with base62 string form) now defined in cart_id.go.
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type StockStatus int
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type ItemMeta struct {
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Name string `json:"name"`
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Brand string `json:"brand,omitempty"`
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Category string `json:"category,omitempty"`
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Category2 string `json:"category2,omitempty"`
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Category3 string `json:"category3,omitempty"`
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Category4 string `json:"category4,omitempty"`
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Category5 string `json:"category5,omitempty"`
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SellerId string `json:"sellerId,omitempty"`
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SellerName string `json:"sellerName,omitempty"`
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Image string `json:"image,omitempty"`
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Outlet *string `json:"outlet,omitempty"`
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}
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type CartItem struct {
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Id uint32 `json:"id"`
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ItemId uint32 `json:"itemId,omitempty"`
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ParentId uint32 `json:"parentId,omitempty"`
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Sku string `json:"sku"`
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Price Price `json:"price"`
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TotalPrice Price `json:"totalPrice"`
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OrgPrice *Price `json:"orgPrice,omitempty"`
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Stock StockStatus `json:"stock"`
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Quantity int `json:"qty"`
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Discount *Price `json:"discount,omitempty"`
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Disclaimer string `json:"disclaimer,omitempty"`
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ArticleType string `json:"type,omitempty"`
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StoreId *string `json:"storeId,omitempty"`
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Meta *ItemMeta `json:"meta,omitempty"`
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}
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type CartDelivery struct {
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Id uint32 `json:"id"`
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Provider string `json:"provider"`
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Price Price `json:"price"`
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Items []uint32 `json:"items"`
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PickupPoint *messages.PickupPoint `json:"pickupPoint,omitempty"`
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}
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type CartNotification struct {
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LinkedId int `json:"id"`
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Provider string `json:"provider"`
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Title string `json:"title"`
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Content string `json:"content"`
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}
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type CartGrain struct {
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mu sync.RWMutex
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lastItemId uint32
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lastDeliveryId uint32
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lastVoucherId uint32
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lastAccess time.Time
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lastChange time.Time // unix seconds of last successful mutation (replay sets from event ts)
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userId string
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Id CartId `json:"id"`
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Items []*CartItem `json:"items"`
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TotalPrice *Price `json:"totalPrice"`
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TotalDiscount *Price `json:"totalDiscount"`
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Deliveries []*CartDelivery `json:"deliveries,omitempty"`
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Processing bool `json:"processing"`
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PaymentInProgress bool `json:"paymentInProgress"`
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OrderReference string `json:"orderReference,omitempty"`
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PaymentStatus string `json:"paymentStatus,omitempty"`
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Vouchers []*Voucher `json:"vouchers,omitempty"`
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Notifications []CartNotification `json:"cartNotification,omitempty"`
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}
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type Voucher struct {
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Code string `json:"code"`
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Rules []*messages.VoucherRule `json:"rules"`
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Id uint32 `json:"id"`
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Value int64 `json:"value"`
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}
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func (v *Voucher) AppliesTo(cart *CartGrain) ([]*CartItem, bool) {
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// No rules -> applies to entire cart
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if len(v.Rules) == 0 {
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return cart.Items, true
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}
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// Build evaluation context once
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ctx := voucher.EvalContext{
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Items: make([]voucher.Item, 0, len(cart.Items)),
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CartTotalInc: 0,
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}
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if cart.TotalPrice != nil {
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ctx.CartTotalInc = cart.TotalPrice.IncVat
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}
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for _, it := range cart.Items {
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category := ""
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if it.Meta != nil {
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category = it.Meta.Category
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}
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ctx.Items = append(ctx.Items, voucher.Item{
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Sku: it.Sku,
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Category: category,
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UnitPrice: it.Price.IncVat,
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})
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}
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// All voucher rules must pass (logical AND)
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for _, rule := range v.Rules {
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expr := rule.GetCondition()
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if expr == "" {
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// Empty condition treated as pass (acts like a comment / placeholder)
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continue
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}
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rs, err := voucher.ParseRules(expr)
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if err != nil {
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// Fail closed on parse error
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return nil, false
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}
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if !rs.Applies(ctx) {
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return nil, false
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}
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}
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return cart.Items, true
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}
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func (c *CartGrain) GetId() uint64 {
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return uint64(c.Id)
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}
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func (c *CartGrain) GetLastChange() time.Time {
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return c.lastChange
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}
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func (c *CartGrain) GetLastAccess() time.Time {
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return c.lastAccess
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}
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func (c *CartGrain) GetCurrentState() (*CartGrain, error) {
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c.lastAccess = time.Now()
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return c, nil
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}
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func getInt(data float64, ok bool) (int, error) {
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if !ok {
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return 0, fmt.Errorf("invalid type")
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}
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return int(data), nil
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}
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// func (c *CartGrain) AddItem(sku string, qty int, country string, storeId *string) (*CartGrain, error) {
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// cartItem, err := getItemData(sku, qty, country)
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// if err != nil {
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// return nil, err
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// }
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// cartItem.StoreId = storeId
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// return c.Apply(cartItem, false)
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// }
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func (c *CartGrain) GetState() ([]byte, error) {
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return json.Marshal(c)
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}
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func (c *CartGrain) ItemsWithDelivery() []uint32 {
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ret := make([]uint32, 0, len(c.Items))
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for _, item := range c.Items {
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for _, delivery := range c.Deliveries {
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for _, id := range delivery.Items {
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if item.Id == id {
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ret = append(ret, id)
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}
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}
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}
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}
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return ret
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}
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func (c *CartGrain) ItemsWithoutDelivery() []uint32 {
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ret := make([]uint32, 0, len(c.Items))
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hasDelivery := c.ItemsWithDelivery()
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for _, item := range c.Items {
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found := slices.Contains(hasDelivery, item.Id)
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if !found {
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ret = append(ret, item.Id)
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}
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}
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return ret
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}
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func (c *CartGrain) FindItemWithSku(sku string) (*CartItem, bool) {
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c.mu.RLock()
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defer c.mu.RUnlock()
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for _, item := range c.Items {
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if item.Sku == sku {
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return item, true
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}
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}
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return nil, false
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}
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// func (c *CartGrain) Apply(content proto.Message, isReplay bool) (*CartGrain, error) {
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// updated, err := ApplyRegistered(c, content)
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// if err != nil {
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// if err == ErrMutationNotRegistered {
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// return nil, fmt.Errorf("unsupported mutation type %T (not registered)", content)
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// }
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// return nil, err
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// }
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// // Sliding TTL: update lastChange only for non-replay successful mutations.
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// if updated != nil && !isReplay {
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// c.lastChange = time.Now()
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// c.lastAccess = time.Now()
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// go AppendCartEvent(c.Id, content)
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// }
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// return updated, nil
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// }
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func (c *CartGrain) UpdateTotals() {
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c.TotalPrice = NewPrice()
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c.TotalDiscount = NewPrice()
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for _, item := range c.Items {
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rowTotal := MultiplyPrice(item.Price, int64(item.Quantity))
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item.TotalPrice = *rowTotal
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c.TotalPrice.Add(*rowTotal)
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if item.OrgPrice != nil {
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diff := NewPrice()
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diff.Add(*item.OrgPrice)
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diff.Subtract(item.Price)
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if diff.IncVat > 0 {
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c.TotalDiscount.Add(*diff)
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}
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}
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}
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for _, delivery := range c.Deliveries {
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c.TotalPrice.Add(delivery.Price)
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}
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for _, voucher := range c.Vouchers {
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if _, ok := voucher.AppliesTo(c); ok {
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value := NewPriceFromIncVat(voucher.Value, 25)
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c.TotalDiscount.Add(*value)
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c.TotalPrice.Subtract(*value)
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}
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}
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}
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