def get_available_clients(service):
details = GOOGLE_CLIENT_MAP.get(service, None)<EOL>if details:<EOL><INDENT>return [details]<EOL><DEDENT>else:<EOL><INDENT>return None<EOL><DEDENT>
Return clients available for this service.

:param service: Google Cloud service name. Examples: 'iam', 'gce'.
:type service: ``str``

:return: list of dictionaries describing the clients available.
:rtype: ``list``