def listBuckets(storageSvc, projectName):
    """List all buckets in given Google Cloud Storage project

    Args:
        storageSvc: Storage service (from getGoogleServices()['storage'])
        projectName (str): Cloud project Name

    Returns:
        List of bucket names or None
    """
    fields = 'nextPageToken,items(name)'
    res = storageSvc.buckets().list(project = projectName, fields = fields).execute()
    if res and 'items' in res:
        return [item['name'] for item in res['items']]
    return None