return groupSet.ToSlice(), nil
}

// ListGroups - lists groups. Since this is not going to be a frequent
// operation, we fetch this info from storage, and refresh the cache as well.
func (store *IAMStoreSys) ListGroups(ctx context.Context) (res []string, err error) {
	cache := store.lock()
	defer store.unlock()

	return store.updateGroups(ctx, cache)
}

// listGroups - lists groups - fetch groups from cache

	}

	return sys.store.GetGroupDescription(group)
}

// ListGroups - lists groups.
func (sys *IAMSys) ListGroups(ctx context.Context) (r []string, err error) {
	if !sys.Initialized() {
		return r, errServerNotInitialized
	}

	select {
	case <-sys.configLoaded:
		return sys.store.ListGroups(ctx)
	case <-ctx.Done():
		return nil, ctx.Err()
	}
}

	}

	writeSuccessResponseJSON(w, body)
}

// ListGroups - GET /minio/admin/v3/groups
func (a adminAPIHandlers) ListGroups(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	objectAPI, _ := validateAdminReq(ctx, w, r, policy.ListGroupsAdminAction)
	if objectAPI == nil {
		return
	}

	groups, err := globalIAMSys.ListGroups(ctx)
	if err != nil {