167 lines
3.4 KiB
Go
167 lines
3.4 KiB
Go
package main
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import (
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"encoding/json"
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"fmt"
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"time"
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messages "git.tornberg.me/go-cart-actor/proto"
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)
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type CartId [16]byte
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func (id CartId) MarshalJSON() ([]byte, error) {
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return json.Marshal(id.String())
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}
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func (id *CartId) UnmarshalJSON(data []byte) error {
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var str string
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err := json.Unmarshal(data, &str)
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if err != nil {
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return err
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}
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copy(id[:], []byte(str))
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return nil
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}
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type CartItem struct {
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Id int `json:"id"`
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Sku string `json:"sku"`
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Name string `json:"name"`
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Price int64 `json:"price"`
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Image string `json:"image"`
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}
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type CartDelivery struct {
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Provider string `json:"provider"`
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Price int64 `json:"price"`
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Items []int `json:"items"`
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}
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type CartGrain struct {
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lastItemId int
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lastDeliveryId int
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storageMessages []Message
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Id CartId `json:"id"`
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Items []CartItem `json:"items"`
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TotalPrice int64 `json:"totalPrice"`
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Deliveries []string `json:"deliveries,omitempty"`
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}
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type Grain interface {
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GetId() CartId
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HandleMessage(message *Message, isReplay bool) ([]byte, error)
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}
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func (c *CartGrain) GetId() CartId {
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return c.Id
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}
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func (c *CartGrain) GetLastChange() int64 {
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if len(c.storageMessages) == 0 {
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return 0
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}
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return *c.storageMessages[len(c.storageMessages)-1].TimeStamp
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}
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func getItemData(sku string) (*messages.AddItem, error) {
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item, err := FetchItem(sku)
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if err != nil {
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return nil, err
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}
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price := 0
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priceField, ok := item.Fields[4]
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if ok {
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priceFloat, ok := priceField.(float64)
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if !ok {
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price, ok = priceField.(int)
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if !ok {
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return nil, fmt.Errorf("invalid price type")
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}
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} else {
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price = int(priceFloat)
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}
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}
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if price == 0 {
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return nil, fmt.Errorf("invalid price")
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}
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return &messages.AddItem{
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Quantity: 1,
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Price: int64(price),
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Sku: sku,
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Name: item.Title,
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Image: item.Img,
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}, nil
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}
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func (c *CartGrain) AddItem(sku string) ([]byte, error) {
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cartItem, err := getItemData(sku)
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if err != nil {
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return nil, err
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}
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return c.HandleMessage(&Message{
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Type: 2,
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Content: cartItem,
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}, false)
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}
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func (c *CartGrain) GetStorageMessage(since int64) []StorableMessage {
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ret := make([]StorableMessage, 0)
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for _, message := range c.storageMessages {
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if *message.TimeStamp > since {
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ret = append(ret, message)
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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) HandleMessage(message *Message, isReplay bool) ([]byte, error) {
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if message.TimeStamp == nil {
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now := time.Now().Unix()
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message.TimeStamp = &now
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}
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grainMutations.Inc()
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var err error
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switch message.Type {
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case AddRequestType:
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msg, ok := message.Content.(*messages.AddRequest)
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if !ok {
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err = fmt.Errorf("expected AddRequest")
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} else {
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return c.AddItem(msg.Sku)
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}
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case AddItemType:
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msg, ok := message.Content.(*messages.AddItem)
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if !ok {
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err = fmt.Errorf("expected AddItem")
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} else {
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c.lastItemId++
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c.Items = append(c.Items, CartItem{
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Id: c.lastItemId,
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Sku: msg.Sku,
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Name: msg.Name,
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Price: msg.Price,
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Image: msg.Image,
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})
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c.TotalPrice += msg.Price
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}
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case RemoveItemType:
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//msg, ok := message.Content.(*messages.RemoveItem)
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case AddDeliveryType:
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c.lastDeliveryId++
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//msg, ok := message.Content.(*messages.AddDelivery)
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case RemoveDeliveryType:
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default:
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err = fmt.Errorf("unknown message type %d", message.Type)
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}
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if err != nil {
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return nil, err
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}
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if !isReplay {
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c.storageMessages = append(c.storageMessages, *message)
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}
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return json.Marshal(c)
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}
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