add state file parser

pkg/cart/mutation_test.go

@@ -66,7 +66,7 @@ func msgClearCart() *messages.ClearCartRequest {
 	return &messages.ClearCartRequest{}
 }
 
-func msgAddVoucher(code string, value int64, rules ...*messages.VoucherRule) *messages.AddVoucher {
+func msgAddVoucher(code string, value int64, rules ...string) *messages.AddVoucher {
 	return &messages.AddVoucher{Code: code, Value: value, VoucherRules: rules}
 }
 

pkg/promotions/types.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"os"
 	"strconv"
 )
 
@@ -369,3 +370,36 @@ func WalkConditions(conds []Condition, fn func(c Condition) bool) {
 		}
 	}
 }
+
+type PromotionState struct {
+	Vouchers []PromotionRule `json:"promotions"`
+}
+
+type StateFile struct {
+	State   PromotionState `json:"state"`
+	Version int            `json:"version"`
+}
+
+func (sf *StateFile) GetPromotion(id string) (*PromotionRule, bool) {
+	for _, v := range sf.State.Vouchers {
+		if v.ID == id {
+			return &v, true
+		}
+	}
+	return nil, false
+}
+
+func LoadStateFile(fileName string) (*PromotionState, error) {
+	f, err := os.Open(fileName)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	dec := json.NewDecoder(f)
+	sf := &PromotionState{}
+	err = dec.Decode(sf)
+	if err != nil {
+		return nil, err
+	}
+	return sf, nil
+}