restore Token function

Author: Gleb Brozhe

internal/credentials/static.go

@@ -88,7 +88,9 @@ func (c *Static) Token(ctx context.Context) (token string, err error) {
 		)
 	}
 	defer cc.Close()
+
 	client := Ydb_Auth_V1.NewAuthServiceClient(cc)
+
 	response, err := client.Login(ctx, &Ydb_Auth.LoginRequest{
 		OperationParams: &Ydb_Operations.OperationParams{
 			OperationMode:    0,
@@ -103,6 +105,7 @@ func (c *Static) Token(ctx context.Context) (token string, err error) {
 	if err != nil {
 		return "", xerrors.WithStackTrace(err)
 	}
+
 	switch {
 	case !response.GetOperation().GetReady():
 		return "", xerrors.WithStackTrace(
@@ -111,6 +114,7 @@ func (c *Static) Token(ctx context.Context) (token string, err error) {
 				response.GetOperation().GetIssues(),
 			),
 		)
+
 	case response.GetOperation().GetStatus() != Ydb.StatusIds_SUCCESS:
 		return "", xerrors.WithStackTrace(
 			xerrors.Operation(
@@ -123,10 +127,12 @@ func (c *Static) Token(ctx context.Context) (token string, err error) {
 	if err = response.GetOperation().GetResult().UnmarshalTo(&result); err != nil {
 		return "", xerrors.WithStackTrace(err)
 	}
+
 	expiresAt, err := parseExpiresAt(result.GetToken())
 	if err != nil {
 		return "", xerrors.WithStackTrace(err)
 	}
+
 	c.requestAt = time.Now().Add(time.Until(expiresAt) / TokenRefreshDivisor)
 	c.token = result.GetToken()