<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def db_list(user=None, password=None, host=None, port=None):
    '''
    List all InfluxDB databases

    user
        The user to connect as

    password
        The password of the user

    host
        The host to connect to

    port
        The port to connect to

    CLI Example:

    .. code-block:: bash

        salt '*' influxdb08.db_list
        salt '*' influxdb08.db_list <user> <password> <host> <port>

    '''
    client = _client(user=user, password=password, host=host, port=port)
    return client.get_list_database()