use uuid as struct

proxy/vmess/encoding/encoding_test.go

@@ -22,8 +22,9 @@ func TestRequestSerialization(t *testing.T) {
 		Level: 0,
 		Email: "test@v2ray.com",
 	}
+	id := uuid.New()
 	account := &vmess.Account{
-		Id:      uuid.New().String(),
+		Id:      id.String(),
 		AlterId: 0,
 	}
 	user.Account = serial.ToTypedMessage(account)

proxy/vmess/inbound/inbound.go

@@ -53,8 +53,9 @@ func (v *userByEmail) Get(email string) (*protocol.User, bool) {
 		v.Lock()
 		user, found = v.cache[email]
 		if !found {
+			id := uuid.New()
 			account := &vmess.Account{
-				Id:      uuid.New().String(),
+				Id:      id.String(),
 				AlterId: uint32(v.defaultAlterIDs),
 			}
 			user = &protocol.User{