fix delivery endpoint

pool-server.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"encoding/json"
-	"fmt"
 	"net/http"
 	"strconv"
 
@@ -85,14 +84,11 @@ type SetDelivery struct {
 
 func (s *PoolServer) HandleSetDelivery(w http.ResponseWriter, r *http.Request) error {
 	id := r.PathValue("id")
-	var delivery *SetDelivery
-	err := json.NewDecoder(r.Body).Decode(delivery)
+	delivery := SetDelivery{}
+	err := json.NewDecoder(r.Body).Decode(&delivery)
 	if err != nil {
 		return err
 	}
-	if delivery == nil {
-		return fmt.Errorf("no delivery data")
-	}
 	data, err := s.pool.Process(ToCartId(id), Message{
 		Type: SetDeliveryType,
 		Content: &messages.SetDelivery{