import requests


def pulsar_list(addr, auth):
    """
    Return a list of the all the pulars in the database.
    
    Args:
        addr: hostname or ip address of database server.
        auth: tuple of username and password. 
    """
    path = '{0}/{1}/'.format(addr, 'pulsar_list')
    r = requests.get(url=path, auth=auth)
    r.raise_for_status()
    return r.json()